{"id":4104,"date":"2021-06-23T11:48:50","date_gmt":"2021-06-23T03:48:50","guid":{"rendered":"http:\/\/www.comtest.cn\/?p=4104"},"modified":"2021-08-03T09:43:55","modified_gmt":"2021-08-03T01:43:55","slug":"aboutdb","status":"publish","type":"post","link":"http:\/\/www.comtest.com.cn\/?p=4104","title":{"rendered":"\u8f7b\u677e\u5f7b\u5e95\u641e\u6e05dB\uff0cdB\uff0c dBm\uff0c dBi"},"content":{"rendered":"\t\t
\n\t\t\t\t\t\t
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dB\u5e94\u8be5\u662f\u65e0\u7ebf\u901a\u4fe1\u4e2d\u6700\u57fa\u672c\u3001\u6700\u4e60\u4ee5\u4e3a\u5e38\u7684\u4e00\u4e2a\u6982\u5ff5\u4e86\u3002\u6211\u4eec\u5e38\u8bf4\u201c\u4f20\u64ad\u635f\u8017\u662fxx dB\u201d\u3001\u201c\u53d1\u5c04\u529f\u7387\u662fxx dBm\u201d\u3001\u201c\u5929\u7ebf\u589e\u76ca\u662fxx dBi\u201d\u2026\u2026\u6709\u65f6\uff0c\u8fd9\u4e9b\u957f\u5f97\u5f88\u50cf\u7684dBx\u4eec\u53ef\u80fd\u88ab\u5f04\u6df7\uff0c\u751a\u81f3\u9020\u6210\u8ba1\u7b97\u5931\u8bef\u3002\u5b83\u4eec\u7a76\u7adf\u6709\u4ec0\u4e48\u533a\u522b\u5462\uff1f<\/span><\/span><\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\"\"<\/p>\n

\n<\/p>

\u8fd9\u4e8b\u4e0d\u5f97\u4e0d\u5148\u4ecedB<\/strong>\u8bf4\u8d77\u3002<\/span><\/section>\n
 <\/span><\/section>\n
\u800c\u8bf4\u5230dB\uff0c\u6700\u5e38\u89c1\u7684\u5c31\u662f3dB<\/strong>\u5566\uff01<\/span><\/section>\n
 <\/span><\/section>\n
3dB\u5728\u529f\u7387\u56fe\u6216\u8bef\u7801\u7387\u56fe\u4e2d\u7ecf\u5e38\u51fa\u73b0\u3002\u5176\u5b9e\uff0c\u6ca1\u4ec0\u4e48\u795e\u79d8\u7684\uff0c\u4e0b\u964d3dB\u5c31\u662f\u6307\u529f\u7387\u4e0b\u964d\u4e00\u534a\uff0c3 dB\u70b9\u6307\u7684\u5c31\u662f\u534a\u529f\u7387\u70b9\u3002 <\/span><\/section>\n
 <\/span><\/section>\n
<\/section>\n
<\/section>\n
+3dB\u8868\u793a\u589e\u5927\u4e3a\u4e24\u500d\uff0c-3dB\u8868\u793a\u4e0b\u964d\u4e3a1\/2\u3002\u8fd9\u662f\u600e\u4e48\u6765\u7684\u5462\uff1f<\/span><\/section>\n
 <\/span><\/section>\n
\u5176\u5b9e\u5f88\u7b80\u5355\uff0c\u8ba9\u6211\u4eec\u4e00\u8d77\u770b\u4e0bdB\u7684\u8ba1\u7b97\u516c\u5f0f\uff1a<\/span><\/section>\n
 <\/span><\/section>\n
\"\"<\/section>\n
<\/section>\n

dB\u8868\u793a\u529f\u7387P<\/span>1<\/span>\u76f8\u5bf9\u4e8e\u53c2\u8003\u529f\u7387P<\/span>0<\/span>\u7684\u5927\u5c0f\u5173\u7cfb\u3002\u5982\u679cP<\/span>1<\/span>\u662fP<\/span>0<\/span>\u76842\u500d\uff0c\u90a3\u4e48\uff1a<\/span><\/span><\/p>\n

\"\"<\/span><\/section>\n
<\/section>\n
<\/section>\n

\u5982\u679cP<\/span>1<\/span>\u662fP<\/span>0<\/span>\u7684\u4e00\u534a\uff0c\u90a3\u4e48\uff1a <\/span><\/span><\/p>\n

 <\/span><\/section>\n
\"\"<\/section>\n
 <\/span><\/section>\n

\u5173\u4e8e\u5bf9\u6570\u7684\u57fa\u672c\u6982\u5ff5\u53ca\u8fd0\u7b97\u6027\u8d28\uff0c\u5927\u5bb6\u53ef\u4ee5\u81ea\u884c\u56de\u987e\u4e0b\u9ad8\u4e00\u6570\u5b66\u3002\u3002\u3002 <\/span><\/p>\n

\"\"<\/section>\n
<\/section>\n
 <\/span><\/section>\n

\u73b0\u5728\u51fa\u9053\u9898\u6765\u68c0\u9a8c\u4e0b\u4f60\u7684\u7406\u89e3\u7a0b\u5ea6\uff1a<\/span><\/p>\n

\n
\n
\n
\n
\n
\n
\n
\n
<\/section>\n
\n
\n

\u3010\u95ee<\/strong>\u3011\u529f\u7387\u589e\u5927\u4e3a10\u500d\uff0c\u7528\uff1fdB\u8868\u793a<\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n
\n
\n
\n
\n
\n
\n

\"\"<\/p>\n

\u8fd9\u91cc<\/span>\u8bf7\u5927\u5bb6\u8bb0\u4f4f\u4e00\u4e2a\u53e3\u8bc0\u3002\u8bb0\u4f4f\u4e86\u8fd9\u4e2a\u53e3\u8bc0\uff0c\u4f60\u57fa\u672c\u5c31\u53ef\u4ee5\u6a2a\u7740\u8d70\u8def\u4e86\u3002 <\/span><\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n
 <\/span><\/section>\n<\/section>\n<\/section>\n
\"\"<\/section>\n
<\/section>\n
\n
\n
\n
\n
\n

+3dB\uff0c\u8868\u793a\u529f\u7387\u589e\u52a0\u4e3a2\u500d\uff1b+10dB\uff0c\u8868\u793a\u529f\u7387\u589e\u52a0\u4e3a10\u500d\u3002<\/span><\/p>\n

-3dB\uff0c\u8868\u793a\u529f\u7387\u51cf\u5c0f\u4e3a1\/2\uff1b-10dB\uff0c\u8868\u793a\u529f\u7387\u51cf\u5c0f\u4e3a1\/10\u3002<\/span><\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

 <\/span><\/section>\n

\u53ef\u89c1dB\u662f\u4e2a\u76f8\u5bf9\u503c\uff0c\u5b83\u7684\u4f7f\u547d\u5c31\u662f\u628a\u4e00\u4e2a\u5f88\u5927\u6216\u8005\u5f88\u5c0f\u7684\u6570\uff0c\u7528\u4e00\u4e2a\u7b80\u77ed\u7684\u5f62\u5f0f\u8868\u8fbe\u51fa\u6765\u3002 <\/span><\/p>\n

\"\"<\/span><\/section>\n
<\/section>\n

\u8fd9\u53ef\u4ee5\u6781\u5927\u7684\u65b9\u4fbf\u6211\u4eec\u8ba1\u7b97\u548c\u63cf\u8ff0\u3002\u5c24\u5176\u662f\u7ed8\u5236\u8868\u683c\u7684\u65f6\u5019\uff0c\u5927\u5bb6\u53ef\u4ee5\u81ea\u884c\u8111\u8865\u4e0b\uff0c\u6ca1\u6362\u7b97\u6210dB\u524d\uff0c\u8fd9\u4e48\u591a\u76840\uff0c\u5750\u6807\u8f74\u5f97\u62c9\u5230\u5916\u592a\u7a7a\u4e86\u5427\u3002\u3002\u3002<\/span><\/p>

\u7406\u89e3\u4e86dB\uff0c\u4f60\u53ea\u80fd\u6a2a\u7740\u8d70\uff0c\u7406\u89e3\u4e86dB\u5bb6\u65cf\u7684\u5176\u5b83\u6210\u5458\uff0c\u4f60\u5c31\u53ef\u4ee5\u8eba\u8d62\u4e86\u3002 <\/span><\/p>\n

\n

\"\"<\/p>\n

<\/section>\n<\/section>\n
<\/section>\n

\u6211\u4eec\u8fd8\u662f\u4ece\u6700\u5e38\u7528\u7684dBm\u3001dBw\u6765\u8bf4\u3002<\/span><\/p>\n

 <\/span><\/p>\n

dBm\u3001dBw\u5c31\u662f\u628adB\u516c\u5f0f\u4e2d\u7684\u53c2\u8003\u529f\u7387P<\/span>0<\/span>\u5206\u522b\u6362\u62101 mW\u30011 W\uff1a <\/span><\/span><\/p>\n

<\/section>\n
\"\"<\/section>\n
 <\/span><\/section>\n

1 mW\u30011 W\u90fd\u662f\u786e\u5b9a\u7684\u503c\uff0c\u56e0\u6b64dBm\u3001dBw\u90fd\u53ef\u4ee5\u8868\u793a\u529f\u7387\u7684\u7edd\u5bf9\u503c\u3002<\/span><\/p>\n

\n<\/p>

\u76f4\u63a5\u4e0a\u4e2a\u529f\u7387\u6362\u7b97\u8868\u4f9b\u5927\u5bb6\u53c2\u8003\u3002<\/span><\/p>\n

\"\"<\/span><\/section>\n

\n<\/p>

 <\/span><\/section>\n

\u8fd9\u91cc\uff0c\u6211\u4eec\u8981\u8bb0\u4f4f\uff1a<\/span><\/p>\n

\n
\n
\n
\n

1 W = 30 dBm<\/strong>\u3002<\/strong><\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

<\/section>\n

\u7b80\u5316\u53e3\u8bc0\u662f\u201c30\u662f\u57fa\u51c6\uff0c\u7b49\u4e8e1 W\u6574\u201d\u3002<\/span><\/p>\n

<\/section>\n

\u8bb0\u4f4f\u4e86\u8fd9\u6761\uff0c\u518d\u7ed3\u5408\u524d\u9762\u7684\u201c\u52a03\u4e582\uff0c\u52a010\u4e5810\uff1b\u51cf3\u96642\uff0c\u51cf10\u966410\u201d\uff0c\u4f60\u5c31\u53ef\u4ee5\u8fdb\u884c\u5f88\u591a\u53e3\u7b97\u4e86\u3002 <\/span><\/p>\n

<\/section>\n
\"\"<\/span><\/section>\n

\u8d76\u7d27\u51fa\u9053\u9898\u6765\u68c0\u9a8c\u4e0b\u3002<\/span><\/p>\n

\n
\n
\n
\n
\n
\n
\n
\n
<\/section>\n
\n
\n

\u3010\u95ee\u301144 dBm=\uff1fW<\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n
\n
\n
\"\"

<\/p>\n

\n
\u4f60\u7b97\u5bf9\u4e86\u5417\uff1f<\/span><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

 <\/span><\/p>\n

\u8fd9\u91cc\u6211\u4eec\u9700\u8981\u6ce8\u610f\uff0c\u7b49\u5f0f\u53f3\u4fa7\u9664\u4e8630 dBm\uff0c\u5176\u4f59\u7684\u62c6\u5206\u9879\u90fd\u8981\u7528dB\u8868\u793a\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u7528\u4e00\u4e2adBx\u51cf\u53e6\u4e00\u4e2adBx\u65f6\uff0c\u5f97\u5230\u7684\u7ed3\u679c\u7528dB\u8868\u793a\u3002<\/span><\/p>\n

<\/section>\n

[\u4f8b] \u5982\u679cA\u7684\u529f\u7387\u4e3a46 dBm\uff0cB\u7684\u529f\u7387\u4e3a40 dBm\uff0c\u53ef\u4ee5\u8bf4A\u6bd4B\u59276 dB\u3002<\/span><\/p>\n

[\u4f8b] \u5982\u679cA\u5929\u7ebf\u4e3a12 dBd\uff0cB\u5929\u7ebf\u4e3a14 dBd\uff0c\u53ef\u4ee5\u8bf4A\u6bd4B\u5c0f2 dB\u3002<\/span><\/p>\n

 <\/span><\/section>\n
\"\"<\/section>\n
 <\/span><\/section>\n

\u4f8b\u5982\uff0c46 dB\u8868\u793aP<\/span>1<\/span>\u4e3aP<\/span>0<\/span>\u76844\u4e07\u500d\uff0c46 dBm\u5219\u8868\u793aP<\/span>1<\/span>\u7684\u503c\u4e3a40 W\u3002\u7b26\u53f7\u4e2d\u4ec5\u4ec5\u5dee\u4e86\u4e00\u4e2am\uff0c\u4ee3\u8868\u7684\u542b\u4e49\u53ef\u5b8c\u5168\u4e0d\u540c\u3002<\/span><\/span><\/p>

dB\u5bb6\u65cf\u4e2d\u5e38\u89c1\u7684\u8fd8\u6709dBi\u3001dBd\u3001dBc\u3002\u5b83\u4eec\u7684\u8ba1\u7b97\u65b9\u6cd5\u4e0edB\u7684\u8ba1\u7b97\u65b9\u6cd5\u5b8c\u5168\u4e00\u6837\uff0c\u8868\u793a\u7684\u8fd8\u662f\u529f\u7387\u7684\u76f8\u5bf9\u503c\u3002<\/span><\/p>\n

\n<\/p>

\u4e0d\u540c\u7684\u662f\uff0c\u5b83\u4eec\u7684\u53c2\u8003\u57fa\u51c6\u4e0d\u540c\uff0c\u5373\u5206\u6bcd\u4e0a\u7684\u53c2\u8003\u529f\u7387P<\/span>0<\/span>\u6240\u4ee3\u8868\u7684\u542b\u4e49\u4e0d\u540c\u3002<\/span><\/span><\/p>\n

<\/section>\n
<\/section>\n
\"\"<\/section>\n

\u4e00\u822c\u8ba4\u4e3a\uff0c\u8868\u793a\u540c\u4e00\u4e2a\u589e\u76ca\uff0c\u7528dBi\u8868\u793a\u51fa\u6765\u6bd4\u7528dBd\u8868\u793a\u51fa\u6765\u8981\u59272.15\u3002\u8fd9\u4e2a\u5dee\u503c\u662f\u4e24\u79cd\u5929\u7ebf\u7684\u4e0d\u540c\u65b9\u5411\u6027\u5bfc\u81f4\u7684\uff0c\u8fd9\u91cc\u54b1\u4eec\u5c31\u4e0d\u5c55\u5f00\u8bf4\u4e86\u3002<\/span><\/p>

\u6b64\u5916\uff0cdB\u5bb6\u65cf\u4e0d\u4ec5\u53ef\u4ee5\u8868\u793a\u529f\u7387\u7684\u589e\u76ca\u548c\u635f\u8017\uff0c\u8fd8\u53ef\u4ee5\u8868\u793a\u7535\u538b\u3001\u7535\u6d41\u3001\u97f3\u9891\u7b49\uff0c\u5927\u5bb6\u8981\u5177\u4f53\u573a\u666f\u5177\u4f53\u5e94\u7528\u3002<\/span><\/p>\n

\n<\/p>

\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5bf9\u4e8e\u529f\u7387\u7684\u589e\u76ca\uff0c\u6211\u4eec\u752810lg\uff08P<\/span>o<\/span>\/P<\/span>i<\/span>\uff09\uff0c\u5bf9\u4e8e\u7535\u538b\u548c\u7535\u6d41\u7684\u589e\u76ca\uff0c\u8981\u752820lg\uff08V<\/span>o<\/span>\/V<\/span>i<\/span>\uff09\u300120lg\uff08I<\/span>o<\/span>\/I<\/span>i<\/span>\uff09\u3002 <\/span><\/span><\/p>\n

<\/section>\n
\"\"<\/section>\n
 <\/span><\/section>\n

\u591a\u7684\u8fd9\u4e2a2\u500d\u662f\u600e\u4e48\u6765\u7684\u5462\uff1f<\/span><\/p>\n

\n<\/p>

\u8fd9\u4e2a2\u6765\u6e90\u4e8e\u7535\u529f\u7387\u8f6c\u6362\u516c\u5f0f\u7684\u5e73\u65b9\u4e0a\u3002\u5bf9\u6570\u91cc\u9762\u7684n\u6b21\u65b9\uff0c\u8ba1\u7b97\u540e\u5bf9\u5e94\u7684\u5c31\u662fn\u500d\u5566\u3002 <\/span><\/p>\n

 <\/span><\/section>\n
\"\"<\/section>\n
 <\/span><\/section>\n

\u5173\u4e8e\u529f\u7387\u548c\u7535\u538b\u3001\u7535\u6d41\u7684\u8f6c\u6362\u5173\u7cfb\uff0c\u5927\u5bb6\u53ef\u4ee5\u81ea\u884c\u6e29\u4e60\u4e0b\u521d\u4e2d\u7269\u7406\u3002\u3002\u3002<\/span><\/p>\n

 <\/span><\/section>\n
\"\"<\/section>\n
 <\/span><\/section>\n

\u6700\u540e\uff0c\u6574\u7406\u4e86\u4e00\u4e9b\u4e3b\u8981\u7684dB\u5bb6\u5ead\u6210\u5458\uff0c\u4f9b\u5927\u5bb6\u53c2\u8003\u3002<\/span><\/p>\n

 <\/span><\/section>\n
\u76f8\u5bf9\u503c\uff1a<\/span><\/section>\n

\"\"<\/p>\n

<\/section>\n
\u7edd\u5bf9\u503c\uff1a<\/span><\/section>\n

\"\"<\/p>\n

 <\/span><\/section>\n

\u6700\u6700\u540e\uff0c\u6211\u4eec\u518d\u6765\u51fa\u4e24\u9053\u9898\u68c0\u9a8c\u4e0b\u5927\u5bb6\u7684\u6210\u679c\u3002<\/span> <\/span><\/p>\n

<\/section>\n
\n
\n
\n
\n

1. 30 dBm\u7684\u529f\u7387\u662f\uff08\uff09<\/span><\/strong><\/p>\n

A. 1 W<\/span><\/p>\n

B. 10 W<\/span><\/p>\n

C. 1 mW<\/span><\/p>\n

D. 10 mW<\/span><\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n

 <\/span><\/p>\n

 <\/span><\/p>\n

\u7b54\u6848\uff1a\u300cA\u300d<\/span><\/p>\n

 <\/span><\/p>\n

\u8fd9\u4e2a\u662f\u9001\u5206\u9898\u554a~\u8bb0\u4f4f\u53e3\u8bc0\uff1a30\u662f\u57fa\u51c6\uff0c\u7b49\u4e8e1 W\u6574\u3002<\/span><\/p>\n

\n<\/p><\/section>\n

\n
\n
\n
\n
\n
\n
\n
\n
<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n
\n
\n
\n
\n

2. \u5047\u5b9a\u5c0f\u533a\u8f93\u51fa\u603b\u529f\u7387\u4e3a46 dBm\uff0c\u57282\u5929\u7ebf\u65f6\uff0c\u5355\u5929\u7ebf\u529f\u7387\u662f\uff08 \uff09<\/span><\/strong><\/p>\n

A. 46 dBm<\/span><\/p>\n

B. 43 dBm<\/span><\/p>\n

C. 23 dBm<\/span><\/p>\n

D. 40 dBm<\/span><\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

<\/p>\n

\u7b54\u6848\uff1a\u300cB\u300d <\/p>\n

\u8bb0\u4f4f\u53e3\u8bc0\u201c\u51cf3\u96642\u201d\uff0c\u4e24\u4e2a\u5929\u7ebf\u662f46 dBm\uff0c\u5355\u5929\u7ebf\u5c31\u662f\u529f\u7387\u51cf\u5c11\u4e00\u534a\uff0c\u5c31\u662f\u51cf3 dB\u54e6\uff1a46 dBm -3 dB=43 dBm\u3002<\/p>\n

\u6216\u8005\uff0c\u4f60\u4e5f\u53ef\u4ee5\u5148\u8ba1\u7b97\u51fa46 dBm\u5bf9\u5e9440W\uff0c\u90a3\u4e48\u5355\u5929\u7ebf\u529f\u7387\u662f20W\uff0c\u537310lg\uff0820W\/1mW\uff09=43 dBm\u3002<\/p>\n

<\/p>\n

<\/p>\n

\n
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\u7eaf\u8ba1\u6570\u5355\u4f4d<\/strong><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n<\/p>

\u9996\u5148\uff0cdB \u662f\u4e00\u4e2a\u7eaf\u8ba1\u6570\u5355\u4f4d\uff1a\u5bf9\u4e8e\u529f\u7387\uff0cdB = 10*lg(A\/B)\u3002\u5bf9\u4e8e\u7535\u538b\u6216\u7535\u6d41\uff0cdB = 20*lg(A\/B).dB\u7684\u610f\u4e49\u5176\u5b9e\u518d\u7b80\u5355\u4e0d\u8fc7\u4e86\uff0c\u5c31\u662f\u628a\u4e00\u4e2a\u5f88\u5927\uff08\u540e\u9762\u8ddf\u4e00\u957f\u4e320\u7684\uff09\u6216\u8005\u5f88\u5c0f\uff08\u524d\u9762\u6709\u4e00\u957f\u4e320\u7684\uff09\u7684\u6570\u6bd4\u8f83\u7b80\u77ed\u5730\u8868\u793a\u51fa\u6765\u3002\u5982\uff1a<\/span><\/section>\n

 <\/span><\/p>\n

\n
\n
\n
\n
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X=1000000000000000 (\u517115\u4e2a0)<\/span><\/section>\n
10lgX=150dB<\/span><\/section>\n
X=0.000000000000001<\/span><\/section>\n
10lgX=-150 dB<\/span><\/section>\n
dBm \u5b9a\u4e49\u7684\u662fmiliwatt\u30020 dBm=10lg1mw\uff1b<\/span><\/section>\n
dBw \u5b9a\u4e49watt\u30020 dBw = 10lg1 W = 10lg1000 mw = 30 dBm\u3002<\/span><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n<\/p>

dB\u5728\u7f3a\u7701\u60c5\u51b5\u4e0b\u603b\u662f\u5b9a\u4e49\u529f\u7387\u5355\u4f4d\uff0c\u4ee510lg \u4e3a\u8ba1\u3002\u5f53\u7136\u67d0\u4e9b\u60c5\u51b5\u4e0b\u53ef\u4ee5\u7528\u4fe1\u53f7\u5f3a\u5ea6\uff08Amplitude\uff09\u6765\u63cf\u8ff0\u529f\u548c\u529f\u7387\uff0c\u8fd9\u65f6\u5019\u5c31\u752820lg \u4e3a\u8ba1\u3002\u4e0d\u7ba1\u662f\u63a7\u5236\u9886\u57df\u8fd8\u662f\u4fe1\u53f7\u5904\u7406\u9886\u57df\u90fd\u662f\u8fd9\u6837\u3002\u6bd4\u5982\u6709\u65f6\u5019\u5927\u5bb6\u53ef\u4ee5\u770b\u5230dBmV \u7684\u8868\u8fbe\u3002<\/span><\/section>\n

\n<\/p>

\n
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\u6ce8\u610f\u57fa\u672c\u6982\u5ff5<\/strong><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n<\/p>

\u5728dB\uff0cdBm\u8ba1\u7b97\u4e2d\uff0c\u8981\u6ce8\u610f\u57fa\u672c\u6982\u5ff5\u3002\u6bd4\u5982\u524d\u9762\u8bf4\u76840dBw = 10lg1W = 10lg1000mw = 30dBm\uff1b\u53c8\u6bd4\u5982\uff0c\u7528\u4e00\u4e2adBm \u51cf\u53e6\u5916\u4e00\u4e2adBm\u65f6\uff0c\u5f97\u5230\u7684\u7ed3\u679c\u662fdB\u3002\u5982\uff1a30dBm – 0dBm = 30dB\u3002<\/span><\/p>\n

\n<\/p>

\n
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dB\u548cdB\u4e4b\u95f4\u53ea\u6709\u52a0\u51cf<\/strong><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n<\/p>

\u4e00\u822c\u6765\u8bb2\uff0c\u5728\u5de5\u7a0b\u4e2d\uff0cdB\u548cdB\u4e4b\u95f4\u53ea\u6709\u52a0\u51cf\uff0c\u6ca1\u6709\u4e58\u9664\u3002\u800c\u7528\u5f97\u6700\u591a\u7684\u662f\u51cf\u6cd5\uff1adBm\u51cfdBm \u5b9e\u9645\u4e0a\u662f\u4e24\u4e2a\u529f\u7387\u76f8\u9664\uff0c\u4fe1\u53f7\u529f\u7387\u548c\u566a\u58f0\u529f\u7387\u76f8\u9664\u5c31\u662f\u4fe1\u566a\u6bd4\uff08SNR\uff09\u3002dBm \u52a0dBm \u5b9e\u9645\u4e0a\u662f\u4e24\u4e2a\u529f\u7387\u76f8\u4e58\uff0c\u8fd9\u4e2a\u5df2\u7ecf\u4e0d\u591a\u89c1\uff08\u6211\u53ea\u77e5\u9053\u5728\u529f\u7387\u8c31\u5377\u79ef\u8ba1\u7b97\u4e2d\u6709\u8fd9\u6837\u7684\u5e94\u7528\uff09\u3002dBm \u4e58dBm \u662f\u4ec0\u4e48\uff0c1mW\u76841mW \u6b21\u65b9\uff1f\u9664\u4e86\u540c\u5b66\u4eec\u8001\u7ed9\u6211\u5199\u8fd9\u6837\u51e0\u4e4e\u53ef\u4ee5\u548c\u6b4c\u5fb7\u5df4\u8d6b\u731c\u60f3\u5e76\u9a7e\u9f50\u9a71\u7684\u8868\u8fbe\u5f0f\u5916\uff0c\u6211\u6d3b\u4e86\u8fd9\u4e48\u591a\u5e74\u4e5f\u6ca1\u89c1\u8fc7\u54ea\u4e2a\u5de5\u7a0b\u9886\u57df\u73a9\u8fd9\u4e2a\u3002<\/span><\/section>\n

\n<\/p>

\n
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dB\u662f\u529f\u7387\u589e\u76ca\u7684\u5355\u4f4d<\/strong><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n<\/p>

dB\uff0c\u8868\u793a\u4e00\u4e2a\u76f8\u5bf9\u503c\u3002\u5f53\u8ba1\u7b97A\u7684\u529f\u7387\u76f8\u6bd4\u4e8eB\u5927\u6216\u5c0f\u591a\u5c11\u4e2adB\u65f6\uff0c\u53ef\u6309\u516c\u5f0f10 lg A\/B\u8ba1\u7b97\u3002\u4f8b\u5982\uff1aA\u529f\u7387\u6bd4B\u529f\u7387\u5927\u4e00\u500d\uff0c\u90a3\u4e4810 lg A\/B = 10 lg 2 = 3dB\u3002\u4e5f\u5c31\u662f\u8bf4\uff0cA\u7684\u529f\u7387\u6bd4B\u7684\u529f\u7387\u59273dB\uff1b\u5982\u679cA\u7684\u529f\u7387\u4e3a46dBm\uff0cB\u7684\u529f\u7387\u4e3a40dBm\uff0c\u5219\u53ef\u4ee5\u8bf4\uff0cA\u6bd4B\u59276dB\uff1b\u5982\u679cA\u5929\u7ebf\u4e3a12dBd\uff0cB\u5929\u7ebf\u4e3a14dBd\uff0c\u53ef\u4ee5\u8bf4A\u6bd4B\u5c0f2dB\u3002<\/span><\/section>\n

dBm\u662f\u4e00\u4e2a\u8868\u793a\u529f\u7387\u7edd\u5bf9\u503c\u7684\u5355\u4f4d\uff0c\u8ba1\u7b97\u516c\u5f0f\u4e3a\uff1a10lg\u529f\u7387\u503c\/1mW\u3002\u4f8b\u5982\uff1a\u5982\u679c\u53d1\u5c04\u529f\u7387\u4e3a1mW\uff0c\u6309dBm\u5355\u4f4d\u8fdb\u884c\u6298\u7b97\u540e\u7684\u503c\u5e94\u4e3a\uff1a10 lg 1mW\/1mW = 0dBm\uff1b\u5bf9\u4e8e40W\u7684\u529f\u7387,\u521910 lg(40W\/1mW)=46dBm\u3002<\/span><\/p>\n

 <\/span><\/p>\n

\n
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<\/section>\n<\/section>\n<\/section>\n<\/section>\n
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1\u3001dBm<\/strong><\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n
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dBm\u662f\u4e00\u4e2a\u8003\u5f81\u529f\u7387\u7edd\u5bf9\u503c\u7684\u503c\uff0c\u8ba1\u7b97\u516c\u5f0f\u4e3a\uff1a10lg\uff08\u529f\u7387\u503c\/1mw\uff09\u3002<\/p>\n

[\u4f8b1] \u5982\u679c\u53d1\u5c04\u529f\u7387P\u4e3a1mw\uff0c\u6298\u7b97\u4e3adBm\u540e\u4e3a0dBm\u3002<\/p>\n

[\u4f8b2] \u5bf9\u4e8e40W\u7684\u529f\u7387\uff0c\u6309dBm\u5355\u4f4d\u8fdb\u884c\u6298\u7b97\u540e\u7684\u503c\u5e94\u4e3a\uff1a<\/p>\n

10lg\uff0840W\/1mw)=10lg\uff0840000\uff09=10lg\uff084*10^4\uff09=40+10*lg4=46dBm\u3002<\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n
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<\/section>\n<\/section>\n<\/section>\n<\/section>\n
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2\u3001dBi \u548cdBd<\/strong><\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

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dBi\u548cdBd\u662f\u8003\u5f81\u589e\u76ca\u7684\u503c\uff08\u529f\u7387\u589e\u76ca\uff09\uff0c\u4e24\u8005\u90fd\u662f\u4e00\u4e2a\u76f8\u5bf9\u503c,\u4f46\u53c2\u8003\u57fa\u51c6\u4e0d\u4e00\u6837\u3002dBi\u7684\u53c2\u8003\u57fa\u51c6\u4e3a\u5168\u65b9\u5411\u6027\u5929\u7ebf\uff0cdBd\u7684\u53c2\u8003\u57fa\u51c6\u4e3a\u5076\u6781\u5b50,\u6240\u4ee5\u4e24\u8005\u7565\u6709\u4e0d\u540c\u3002\u4e00\u822c\u8ba4\u4e3a\uff0c\u8868\u793a\u540c\u4e00\u4e2a\u589e\u76ca\uff0c\u7528dBi\u8868\u793a\u51fa\u6765\u6bd4\u7528dBd\u8868\u793a\u51fa\u6765\u8981\u59272. 15\u3002<\/p>\n

[\u4f8b3] \u5bf9\u4e8e\u4e00\u9762\u589e\u76ca\u4e3a16dBd\u7684\u5929\u7ebf\uff0c\u5176\u589e\u76ca\u6298\u7b97\u6210\u5355\u4f4d\u4e3adBi\u65f6\uff0c\u5219\u4e3a18.15dBi \uff08\u4e00\u822c\u5ffd\u7565\u5c0f\u6570\u4f4d\uff0c\u4e3a18dBi\uff09\u3002<\/p>\n

[\u4f8b4] 0dBd=2.15dBi\u3002<\/p>\n

[\u4f8b5] GSM900\u5929\u7ebf\u589e\u76ca\u53ef\u4ee5\u4e3a13dBd\uff0815dBi\uff09\uff0cGSM1800\u5929\u7ebf\u589e\u76ca\u53ef\u4ee5\u4e3a15dBd\uff0817dBi)\u3002<\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

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<\/section>\n<\/section>\n<\/section>\n<\/section>\n
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3\u3001dB<\/strong><\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

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dB\u662f\u4e00\u4e2a\u8868\u5f81\u76f8\u5bf9\u503c\u7684\u503c\uff0c\u5f53\u8003\u8651\u7532\u7684\u529f\u7387\u76f8\u6bd4\u4e8e\u4e59\u529f\u7387\u5927\u6216\u5c0f\u591a\u5c11\u4e2adB\u65f6\uff0c\u6309\u4e0b\u9762\u8ba1\u7b97\u516c\u5f0f\uff1a10lg\uff08\u7532\u529f\u7387\/\u4e59\u529f\u7387\uff09<\/p>\n

[\u4f8b6] \u7532\u529f\u7387\u6bd4\u4e59\u529f\u7387\u5927\u4e00\u500d\uff0c\u90a3\u4e4810lg\uff08\u7532\u529f\u7387\/\u4e59\u529f\u7387\uff09=10lg2=3dB\u3002<\/p>\n

\u4e5f\u5c31\u662f\u8bf4\uff0c\u7532\u7684\u529f\u7387\u6bd4\u4e59\u7684\u529f\u7387\u59273 dB\u3002<\/p>\n

[\u4f8b7] 7\/8 \u82f1\u5bf8GSM900\u9988\u7ebf\u7684100\u7c73\u4f20\u8f93\u635f\u8017\u7ea6\u4e3a3.9dB\u3002<\/p>\n

[\u4f8b8] \u5982\u679c\u7532\u7684\u529f\u7387\u4e3a46dBm\uff0c\u4e59\u7684\u529f\u7387\u4e3a40dBm\uff0c\u5219\u53ef\u4ee5\u8bf4\uff0c\u7532\u6bd4\u4e59\u59276 dB\u3002<\/p>\n

[\u4f8b9] \u5982\u679c\u7532\u5929\u7ebf\u4e3a12dBd\uff0c\u4e59\u5929\u7ebf\u4e3a14dBd\uff0c\u53ef\u4ee5\u8bf4\u7532\u6bd4\u4e59\u5c0f2 dB\u3002<\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n
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<\/section>\n<\/section>\n<\/section>\n<\/section>\n
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4\u3001dBc<\/strong><\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

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\u6709\u65f6\u4e5f\u4f1a\u770b\u5230dBc\uff0c\u5b83\u4e5f\u662f\u4e00\u4e2a\u8868\u793a\u529f\u7387\u76f8\u5bf9\u503c\u7684\u5355\u4f4d\uff0c\u4e0edB\u7684\u8ba1\u7b97\u65b9\u6cd5\u5b8c\u5168\u4e00\u6837\u3002\u4e00\u822c\u6765\u8bf4\uff0cdBc \u662f\u76f8\u5bf9\u4e8e\u8f7d\u6ce2\uff08Carrier\uff09\u529f\u7387\u800c\u8a00\uff0c\u5728\u8bb8\u591a\u60c5\u51b5\u4e0b\uff0c\u7528\u6765\u5ea6\u91cf\u4e0e\u8f7d\u6ce2\u529f\u7387\u7684\u76f8\u5bf9\u503c\uff0c\u5982\u7528\u6765\u5ea6\u91cf\u5e72\u6270\uff08\u540c\u9891\u5e72\u6270\u3001\u4e92\u8c03\u5e72\u6270\u3001\u4ea4\u8c03\u5e72\u6270\u3001\u5e26\u5916\u5e72\u6270\u7b49\uff09\u4ee5\u53ca\u8026\u5408\u3001\u6742\u6563\u7b49\u7684\u76f8\u5bf9\u91cf\u503c\u3002\u5728\u91c7\u7528dBc\u7684\u5730\u65b9\uff0c\u539f\u5219\u4e0a\u4e5f\u53ef\u4ee5\u4f7f\u7528dB\u66ff\u4ee3\u3002<\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n

\n<\/p><\/section>\n<\/section>\n<\/section>\n

\n

\n<\/p><\/section>\n

\n
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\u641e\u65e0\u7ebf\u548c\u901a\u4fe1\u7ecf\u5e38\u8981\u78b0\u5230\u7684dBm, dBi, dBd, dB, dBc<\/p>\n

\u7ecf\u9a8c\u7b97\u6cd5\uff1a<\/p>\n

\u6709\u4e2a\u7b80\u4fbf\u516c\u5f0f\uff1a0dBm=0.001W \u5de6\u8fb9\u52a010=\u53f3\u8fb9\u4e5810<\/p>\n

\u6240\u4ee50+10dBm=0.001*10W \u537310dBm=0.01W<\/p>\n

\u6545\u5f9720dBm=0.1W 30dBm=1W 40dBm=10W<\/p>\n

\u8fd8\u6709\u5de6\u8fb9\u52a03=\u53f3\u8fb9\u4e582\uff0c\u598240+3dBm=10*2W\uff0c\u537343dBm=20W\uff0c\u8fd9\u4e9b\u662f\u7ecf\u9a8c\u516c\u5f0f\uff0c\u86ee\u597d\u7528\u7684\u3002<\/p>\n

\u6240\u4ee5-50dBm=0dBm-10-10-10-10-10=1mW\/10\/10\/10\/10\/10=0.00001mW\u3002<\/p>\n<\/section>\n<\/section>\n

\n
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<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n


<\/span><\/p>\n

 <\/strong><\/span><\/p>\n

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dBm\u7684\u8ba1\u7b97\u65b9\u6cd5\uff1a(dBm\u4e0emW)<\/strong><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n
\u4e00\u822c\u574a\u95f4\u8d29\u552e\u7684802.11x\u65e0\u7ebf\u7f51\u8defAP\u4e0a\u5934\uff0c\u5e38\u4f1a\u6709\u89c4\u683c\u8bf4\u660e\uff0c\u91cc\u5934\u603b\u4f1a\u6709\u4e00\u9879\u8bf4\u660e\u5230\u8fd9\u4e2aAP\uff08\u6216\u662f\u65e0\u7ebf\u7f51\u8def\u5361\uff09\uff0c\u5b83\u7684\u4f20\u8f93\u529f\u7387\uff08transmission POWER\uff09\u670920dBm\uff0c\u6216\u8005\u6709\u4e9b\u4ea7\u54c1\uff0c\u662f\u4ee5mW\uff08milliWatts\uff09\u4e3a\u5355\u4f4d\uff0c\u4f8b\u5982\u5f88\u6709\u540d\u7684\u795e\u8111\u957f\u8ddd\u79bb\u7f51\u5361\uff0c\u5c31\u8bf4\u4ed6\u4eec\u7684\u7f51\u5361\u5177\u6709\u9ad8\u8fbe100mW\u7684\u53d1\u5c04\u529f\u7387\u3002<\/span><\/section>\n

 <\/strong><\/span><\/p>\n

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\u8fd9\u4e9b\u5355\u4f4d\u662f\u600e\u4e48\u56de\u4e8b\u5462\uff1f<\/strong><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n<\/p>

dBm\u662fdB-milliWatt\uff0c\u5373\u662f\u8fd9\u4e2a\u8bfb\u6570\u662f\u5728\u4e0e\u4e00\u4e2amilliWatt\u4f5c\u6bd4\u8f83\u800c\u5f97\u51fa\u7684\u6570\u5b57\u3002\u5728\u4eea\u5668\u4e2d\u5982\u679c\u663e\u793a\u77400dBm\u7684\u610f\u601d\u5373\u8868\u793a\u8fd9\u4e2a\u8baf\u53f7\u4e0e1mW\u7684\u8baf\u53f7\u6ca1\u6709\u5206\u522b\uff0c\u4e5f\u5c31\u662f\u8bf4\u8fd9\u4e2a\u8baf\u53f7\u7684\u5f3a\u5ea6\u5c31\u662f1mW\u4e86\u3002\u81f3\u4e8eWatt\uff08\u74e6\u7279\uff09\u662f\u529f\u7387\u7684\u5355\u4f4d\u6211\u60f3\u5927\u5bb6\u90fd\u77e5\u9053\uff0c\u5c31\u4e0d\u8d58\u8ff0\u4e86\u3002<\/span><\/section>\n
 <\/span><\/section>\n
\u6240\u4ee5\u6211\u4eec\u5fc5\u987b\u5148\u4ecedB\u8bb2\u8d77\uff0cdB\u5230\u5e95\u662f\u4ec0\u4e48\u5462\uff1fdB\u7684\u5168\u5199\u662fdecibel\uff0c\u82f1\u6587\uff08\u5176\u5b9e\u662f\u62c9\u4e01\u8bed\u6587\uff09\u4e2ddeci\u5373\u5341\u5206\u4e00\u7684\u7684\u610f\u601d\u3002\u8fd9\u4e2a\u5355\u4f4d\u539f\u672c\u662fbel \u3002\u4f46\u56e0\u4e3a\u8981\u8fbe\u5230\u4e00\u4e2abel\u7684\u6570\u503c\u6bd4\u8f83\u6240\u9700\u4e4b\u80fd\u91cf\u5dee\u901a\u5e38\u90fd\u8f83\u4e3a\u5927\u800c\u5728\u7535\u8def\u5b66\u4e0a\u5e76\u4e0d\u5e38\u7528\uff0c\u6545\u6b64\u624d\u6bd4\u8f83\u5e38\u7528\u5341\u5206\u4e4b\u4e00bel\uff0c\u4ea6\u5373decibel\u8fd9\u4e2a\u5355\u4f4d\u4e86\u3002<\/span><\/section>\n

 <\/strong><\/span><\/p>\n

\n
\n
\n
\n
\n
\n
\n
\u90a3\u4e48decibel\uff08\u6216\u8005bel\uff09\u53c8\u6307\u4ec0\u4e48\u5462\uff1f<\/strong><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n<\/p>

\u5176\u5b9e\u5b83\u662f\u6307\u5f53\u4f60\u9047\u4e0a\u6709\u4e24\u4e2a\u80fd\u91cf\uff08\u8baf\u53f7\uff09\u7684\u65f6\u5019\uff0cdB\u5c31\u662f\u6211\u4eec\u7528\u6765\u8868\u793a\u8fd9\u4e24\u4e2a\u80fd\u91cf\u4e4b\u95f4\u7684\u5dee\u522b\u7684\u4e00\u79cd\u8868\u793a\u5355\u4f4d\u3002\u5b83\u672c\u8eab\u5e76\u4e0d\u662f\u4e00\u4e2a\u72ec\u7acb\u7684\uff08\u5982\u4f0f\u7279Volt\u3001\u5b89\u57f9Ampere\u7b49\uff09\u7edd\u5bf9\u5355\u4f4d\uff0cdB\u8fd9\u4e2a\u5355\u4f4d\u4e00\u51fa\u73b0\u5373\u610f\u5473\u7740\u662f\u6709\u4e24\u4e2a\u540c\u6837\u6027\u8d28\u7684\u80fd\u91cf\uff08\u6216\u8baf\u53f7\uff09\u6b63\u5728\u88ab\u6bd4\u8f83\u4e4b\u4e2d\u800c\u83b7\u5f97\u7684\u5355\u4f4d\u3002<\/span><\/section>\n
 <\/span><\/section>\n
\u81f3\u6b64\u6216\u8bb8\u5927\u5bb6\u4f1a\u6709\u7591\u95ee\uff1a\u300c\u65e2\u7136dB\u53ea\u662f\u8868\u793a\u4e24\u4e2a\u8baf\u53f7\u95f4\u7684\u80fd\u91cf\u5dee\u522b\u7684\u8bdd\uff0c\u4e3a\u4f55\u4e0d\u5e72\u8106\u7528\u201d\u500d\u6570\u201d\u6765\u505a\u8868\u793a\u5462\uff1f\u662f\u5426\u4e3a\u4e86\u8981\u6545\u4f5c\u6df1\u5965\u800c\u9020\u51fa\u8fd9\u4e2a\u5355\u4f4d\u6765\u5462\uff1f\u300d<\/span><\/section>\n
 <\/span><\/section>\n
\u5f53\u7136\u4e0d\u662f\u5566\uff01\u4e0d\u8fc7\u8fd9\u4e2a\u95ee\u9898\u5012\u4e5f\u95ee\u5f97\u76f8\u5f53\u597d\u3002\u4e0d\u662f\u5417\uff1f\u5e72\u8106\u7528\u201d\u500d\u6570\u201d\u4e0d\u662f\u6765\u5f97\u7b80\u5355\u6613\u61c2\u800c\u4e0d\u81f4\u4e8e\u6709\u8fd9\u4e48\u591a\u7684\u4eba\u641e\u9519\u4e86\u89c2\u5ff5\u5417\uff1f\u67d0\u7a0b\u5ea6\u4e0a\u6797\u6559\u5b98\u4e5f\u76f8\u5f53\u540c\u610f\u8fd9\u4e2a\u8bf4\u6cd5\u3002\u8b6c\u5982\u5f53\u4f60\u5236\u4f5c\u4e00\u90e8\u9ad8\u9891\u7ebf\u6027\u653e\u5927\u5668\uff08LINEAR Amp.\uff09\u65f6\uff0c\u5b83\u7684\u8f93\u5165\u6240\u9700\u529f\u7387\u662f10Watts\u800c\u8f93\u51fa\u5219\u53ef\u8fbe40Watts\u7684\u8bdd\uff0c\u4e3a\u4f55\u4e0d\u5e72\u8106\u8bf4\u6709\u56db\u500d\u7684\u589e\u76ca\u800c\u8981\u8bf4\u6210\u662f6dB\u7684\u589e\u76ca\u5462\uff1f\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e4b\u4e2d\uff0c\u5176\u5b9e\u7684\u786e\u662f\u7528\u201d\u56db\u500d\u201d\u8fd9\u4e2a\u8bf4\u6cd5\u6765\u5f97\u5e72\u8106\u4fd0\u843d\uff0c\u4f46\u8bd5\u770b\u4e00\u770b\u53e6\u4e00\u4e2a\u540c\u7c7b\u4f8b\u5b50\u2026\u2026<\/span><\/section>\n
 <\/span><\/section>\n
\u4eca\u5929\u6211\u4eec\u8bd5\u60f3\u50cf\u4e00\u5957\u53d1\u5c04\u8bbe\u5907\u7531\u521d\u7ea7\u632f\u8361\u7684\u80fd\u91cf\u4ee5\u81f3\u6700\u540e\u7ea7\u7684\u8f93\u51fa\u529f\u7387\u4e4b\u95f4\u7684\u589e\u76ca\u2026\uff0c\u5047\u8bbe\u5728\u521d\u7ea7\u632f\u8361\u65f6\u7684\u529f\u7387\u662f0.5mW\uff08\u6ce8\u610f\u662f\u5047\u8bbe\uff0c\u771f\u7684\u5f53\u7136\u4f1a\u8fdc\u4f4e\u4e8e\u6b64\u6570\uff09\u800c\u5728\u6700\u540e\u7684LINEAR Amp.\u8f93\u51fa\u662f2kW\u3002\u73b0\u5728\u8bd5\u7b97\u4e00\u7b97\u5b83\u4eec\u4e4b\u95f4\u7684\u500d\u6570\u5dee\u522b\u2026\u2026\uff0c2kW\u5c31\u662f2000Watts\u4ea6\u53732,000,000mW\u75282,000,000mW\u9664\u4ee50.5mW\u4fbf\u5f97\u51fa\u500d\u6570\uff0c\u53734,000,000\u500d\u4e86\u3002\u8bd5\u60f3\u4e00\u60f3\uff0c\u6211\u5df2\u5047\u8bbe\u4e86\u632f\u8361\u7ea7\u662f0.5mW\u90a3\u4e48\u5927\u90fd\u8fd8\u5f97\u51fa\u4e86\u56db\u767e\u4e07\u500d\u8fd9\u4e2a\u5982\u6b64\u60ca\u4eba\u7684\u6570\u5b57\uff0c\u4e00\u65e6\u7528\u4e0a\u771f\u5b9e\u7684\u6570\u5b57\u7684\u8bdd\u90a3\u500d\u6570\u52bf\u5fc5\u6bd4\u56db\u767e\u4e07\u6765\u5f97\u66f4\u5927\u66f4\u591a\u4f4d\u6570\u4e86\u3002\u81f3\u6b64\u5927\u5bb6\u6216\u8bb8\u5df2\u7ecf\u660e\u767d\u5728\u5404\u7c7b\u7535\u5b50\u53ca\u65e0\u7ebf\u7535\u7535\u8def\u4e2d\uff08\u5c24\u5176\u662f\u63a5\u6536\u65b9\u9762\uff09\u8fd9\u7c7b\u500d\u6570\u4e4b\u5dee\u522b\u6bd4\u6bd4\u7686\u662f\uff08\u5373\u5982\u4e00\u90e8\u5382\u5236\u7684\u53d1\u5c04\u673a\u7684\u6297\u5e72\u6270\u80fd\u529b\u662f\u4f18\u4e8e\u4e00\u767e\u4e07\u500d\u5c31\u6807\u793a\u6210better than 60dB\uff09\u3002\u5982\u679c\u6bcf\u6b21\u90fd\u8981\u5728\u5404\u4e2a\u5c42\u9762\uff08\u4f8b\u5982\u8bf4\u660e\u4e66\uff0c\u89c4\u683c\u8868\uff09\u5185\u90fd\u6807\u793a\u51fa\u6570\u767e\u4e07\u4ee5\u81f3\u5343\u4e07\u751a\u81f3\u4ebf\u500d\u7684\u6570\u5b57\u5c06\u4f1a\u662f\u4f55\u7b49\u7684\u4e0d\u65b9\u4fbf\u554a\uff01<\/span><\/section>\n

 <\/strong><\/span><\/p>\n

\n
\n
\n
\n
\n
\n
\n
\u90a3\u4e48dB\u53c8\u662f\u5982\u4f55\u8fd0\u7b97\u51fa\u6765\u7684\u5462\uff1f<\/strong><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n<\/p>

bel = lg ( P2 \/ P1 )<\/span><\/p>\n

\u4e0a\u9762\u516c\u5f0f\u91cc\u5934\uff0cP1\u5c31\u662f\u7b2c\u4e00\u4e2a\u88ab\u6bd4\u8f83\u7684\u80fd\u91cf\uff08\u8baf\u53f7\uff09\uff0cP2\u5c31\u662f\u7b2c\u4e8c\u4e2a\u4f5c\u6bd4\u8f83\u7684\u80fd\u91cf\uff08\u8baf\u53f7\uff09\uff0cP1\u4e0eP2\u7684\u5355\u4f4d\u8981\u5927\u5bb6\u76f8\u540c\u3002<\/span><\/p>\n

dB = 10 * bel = 10 * lg ( P2 \/ P1 )<\/span><\/p>\n

\u4f8b\uff1a\u7b2c\u4e00\u4e2a\u8baf\u53f7\u529f\u7387\u662f4Watts\uff0c\u7b2c\u4e8c\u4e2a\u8baf\u53f7\u529f\u7387\u662f24Watts\uff0c\u90a3\u589e\u76ca\u5c31\u662f\uff1a<\/span><\/p>\n

10 * lg ( 24 \/ 4 ) = 10 * lg6 = 7.78 dB<\/span><\/p>\n

OK\uff0c\u6211\u4eec\u56de\u5230dBm\u6765\u770b\uff0c\u56e0\u6b64\u6362\u7b97dBm\u4e0emW\u7684\u516c\u5f0f\u5c31\u5e94\u8be5\u662f\u957f\u6210\u8fd9\u6837\uff1a<\/span><\/p>\n

dBm = 10 * lg(mW)\u6216mW = 10^( dBm \/ 10 )<\/span><\/p>\n

\n<\/p>

\n
\n
\u6240\u4ee5\u5e95\u4e0b\u8fd9\u4e9b\u4f8b\u5b50\u5927\u5bb6\u53ef\u4ee5\u9a8c\u7b97\u4e00\u4e0b\uff1a<\/span><\/strong>

<\/p>\n

0 dBm = 1 mW<\/span><\/p>\n

10 dBm = 10 mW<\/span><\/p>\n

14 dBm = 25 mW<\/span><\/p>\n

15 dBm = 32 mW<\/span><\/p>\n

16 dBm = 40 mW<\/span><\/p>\n

17 dBm = 50 mW<\/span><\/p>\n

20 dBm = 100 mW<\/span><\/p>\n

30 dBm = 1000 mW = 1W<\/span><\/p>\n<\/section>\n<\/section>\n<\/section>\n

\n<\/p>

\u5982\u679c\u5927\u5bb6\u90fd\u5f88\u806a\u660e\uff0c\u4e00\u5b9a\u53ef\u4ee5\u4ecelog\u7684\u57fa\u672c\u6027\u8d28\u4e2d\uff0c\u53d1\u73b0\u5230\u5e95\u4e0b\u7684rule\uff1a<\/span><\/section>\n
dB\u589e\u52a03dB = mW\u4e582\u500d\uff1bdB\u51cf\u5c113dB = mW\u53d8\u62101\/2 \uff1b\u589e\u52a010dB =\u4e5810\u500d<\/span><\/section>\n

\u8fd9\u6837\u4e00\u6765\uff0c\u4f60\u4fbf\u53ef\u4ee5\u7528\u4f60\u7684\u8111\u888b\u76f4\u63a5\u8fdb\u884c\u5feb\u901f\u8fd0\u7b97\u6765\u6c42\u5f97\u6982\u7565\u503c\uff1a<\/span><\/p>\n

 <\/span><\/p>\n

+3dBm= *2
+6dBm= *4 (2*2)
+7dBm= *5 (+10dB-3dB = 10\/2)
+4dBm= *2.5 (+10dB-6dB = 10\/4)
+1dBm= *1.25 (+4dB-3dB=2.5\/2)
+2dBm=*1.6(+6dBm-4dBm=4\/2.5=1.6)<\/span><\/p>\n

 <\/span><\/p>\n

\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5047\u8bbe\u4f60\u5df2\u7ecf\u77e5\u90530dBm = 1mW\uff0c\u90a3\u4e483dBm\u5f53\u7136\u5c31\u7b49\u4e8e2mW\u5570\u3002\u90a3\u4e48\uff0c47dBm\u5462\uff1f40dBm \u219210^4mW\uff0c\u518d\u591a7dBm \u21925 * 10^4mW = 50W\u3002<\/span><\/section>\n

 <\/strong><\/span><\/p>\n

\n
\n
\n
\n
\n
\n
\n
dBc<\/strong><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n<\/p>

\u6709\u65f6\u4e5f\u4f1a\u770b\u5230dBc\uff0c\u5b83\u4e5f\u662f\u4e00\u4e2a\u8868\u793a\u529f\u7387\u76f8\u5bf9\u503c\u7684\u5355\u4f4d\uff0c\u4e0edB\u7684\u8ba1\u7b97\u65b9\u6cd5\u5b8c\u5168\u4e00\u6837\u3002\u4e00\u822c\u6765\u8bf4\uff0cdBc \u662f\u76f8\u5bf9\u4e8e\u8f7d\u6ce2\uff08Carrier\uff09\u529f\u7387\u800c\u8a00\uff0c\u5728\u8bb8\u591a\u60c5\u51b5\u4e0b\uff0c\u7528\u6765\u5ea6\u91cf\u4e0e\u8f7d\u6ce2\u529f\u7387\u7684\u76f8\u5bf9\u503c\uff0c\u5982\u7528\u6765\u5ea6\u91cf\u5e72\u6270\uff08\u540c\u9891\u5e72\u6270\u3001\u4e92\u8c03\u5e72\u6270\u3001\u4ea4\u8c03\u5e72\u6270\u3001\u5e26\u5916\u5e72\u6270\u7b49\uff09\u4ee5\u53ca\u8026\u5408\u3001\u6742\u6563\u7b49\u7684\u76f8\u5bf9\u91cf\u503c\u3002\u5728\u91c7\u7528dBc\u7684\u5730\u65b9\uff0c\u539f\u5219\u4e0a\u4e5f\u53ef\u4ee5\u4f7f\u7528dB\u66ff\u4ee3\u3002<\/span><\/section>\n

 <\/strong><\/span><\/p>\n

\n
\n
\n
\n
\n
\n
\n
dBuV<\/strong><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n<\/p>

\u6839\u636e\u529f\u7387\u4e0e\u7535\u5e73\u4e4b\u95f4\u7684\u57fa\u672c\u516c\u5f0fV^2=P*R\uff0c\u53ef\u77e5dBuV=90+dBm+10*log(R),R\u4e3a\u7535\u963b\u503c\u3002\u5728PHS\u7cfb\u7edf\u4e2d\u6b63\u786e\u5e94\u8be5\u662fdBm=dBuv-107\uff0c\u56e0\u4e3a\u5176\u5929\u9988\u963b\u6297\u4e3a50\u6b27\u3002<\/span><\/section>\n

 <\/strong><\/span><\/p>\n

\n
\n
\n
\n
\n
\n
\n
dBuVemf \u548cdBuV<\/strong><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n<\/p>

emf:electromotive force(\u7535\u52a8\u52bf)<\/span><\/section>\n
\u5bf9\u4e8e\u4e00\u4e2a\u4fe1\u53f7\u6e90\u6765\u8bb2\uff0cdBuVemf\u662f\u6307\u5f00\u8def\u65f6\u7684\u7aef\u53e3\u7535\u538b\uff0cdBuV\u662f\u63a5\u5339\u914d\u8d1f\u8f7d\u65f6\u7684\u7aef\u53e3\u7535\u538b\u3002<\/span><\/section>\n

 <\/strong><\/span><\/p>\n

\n
\n
\n
\n
\n
\n
\n
\u95ee\uff1a\u8bf7\u95eedBi\u3001dBd\u3001dB\u3001dBm\u3001dBc\u4e4b\u95f4\u7684\u533a\u522b\u3002<\/strong><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n<\/p>

\u7b54\uff1a\u5b83\u4eec\u90fd\u662f\u529f\u7387\u589e\u76ca\u7684\u5355\u4f4d\uff0c\u4e0d\u540c\u4e4b\u5904\u5982\u4e0b\uff1a<\/span><\/section>\n
 <\/span><\/section>\n
dBi\u548cdBd\u662f\u529f\u7387\u589e\u76ca\u7684\u5355\u4f4d\uff0c\u4e24\u8005\u90fd\u662f\u76f8\u5bf9\u503c\uff0c\u4f46\u53c2\u8003\u57fa\u51c6\u4e0d\u4e00\u6837\u3002dBi\u7684\u53c2\u8003\u57fa\u51c6\u4e3a\u5168\u65b9\u5411\u6027\u5929\u7ebf\uff1bdBd\u7684\u53c2\u8003\u57fa\u51c6\u4e3a\u5076\u6781\u5b50\u3002\u4e00\u822c\u8ba4\u4e3adBi\u548cdBd\u8868\u793a\u540c\u4e00\u4e2a\u589e\u76ca\uff0c\u7528dBi\u8868\u793a\u7684\u503c\u6bd4\u7528dBd\u8868\u793a\u7684\u8981\u59272.15 dBi\u3002\u4f8b\u5982\uff1a\u5bf9\u4e8e\u4e00\u589e\u76ca\u4e3a16 dBd\u7684\u5929\u7ebf\uff0c\u5176\u589e\u76ca\u6298\u7b97\u6210\u5355\u4f4d\u4e3adBi\u65f6\uff0c\u5219\u4e3a18.15dBi\uff0c\u4e00\u822c\u5ffd\u7565\u5c0f\u6570\u4f4d\uff0c\u4e3a18dBi\u3002<\/span><\/section>\n
 <\/span><\/section>\n
dB\u4e5f\u662f\u529f\u7387\u589e\u76ca\u7684\u5355\u4f4d\uff0c\u8868\u793a\u4e00\u4e2a\u76f8\u5bf9\u503c\u3002\u5f53\u8ba1\u7b97A\u7684\u529f\u7387\u76f8\u6bd4\u4e8eB\u5927\u6216\u5c0f\u591a\u5c11\u4e2adB\u65f6\uff0c\u53ef\u6309\u516c\u5f0f10 lg A\/B\u8ba1\u7b97\u3002\u4f8b\u5982\uff1aA\u529f\u7387\u6bd4B\u529f\u7387\u5927\u4e00\u500d\uff0c\u90a3\u4e4810 lg A\/B = 10 lg 2 = 3dB\u3002\u4e5f\u5c31\u662f\u8bf4\uff0cA\u7684\u529f\u7387\u6bd4B\u7684\u529f\u7387\u59273dB\uff1b\u5982\u679cA\u7684\u529f\u7387\u4e3a46dBm\uff0cB\u7684\u529f\u7387\u4e3a40dBm\uff0c\u5219\u53ef\u4ee5\u8bf4\uff0cA\u6bd4B\u59276dB\uff1b\u5982\u679cA\u5929\u7ebf\u4e3a12dBd\uff0cB\u5929\u7ebf\u4e3a14dBd\uff0c\u53ef\u4ee5\u8bf4A\u6bd4B\u5c0f2dB\u3002<\/span><\/section>\n
 <\/span><\/section>\n
dBm\u662f\u4e00\u4e2a\u8868\u793a\u529f\u7387\u7edd\u5bf9\u503c\u7684\u5355\u4f4d\uff0c\u8ba1\u7b97\u516c\u5f0f\u4e3a\uff1a10lg\u529f\u7387\u503c\/1mW\u3002\u4f8b\u5982\uff1a\u5982\u679c\u53d1\u5c04\u529f\u7387\u4e3a1mW\uff0c\u6309dBm\u5355\u4f4d\u8fdb\u884c\u6298\u7b97\u540e\u7684\u503c\u5e94\u4e3a\uff1a10 lg 1mW\/1mW = 0dBm\uff1b\u5bf9\u4e8e40W\u7684\u529f\u7387,\u521910 lg(40W\/1mW)=46dBm\u3002<\/span><\/section>\n
 <\/span><\/section>\n
dBc\u4e5f\u662f\u4e00\u4e2a\u8868\u793a\u529f\u7387\u76f8\u5bf9\u503c\u7684\u5355\u4f4d\uff0c\u4e0edB\u7684\u8ba1\u7b97\u65b9\u6cd5\u5b8c\u5168\u4e00\u6837\u3002\u4e00\u822c\u6765\u8bf4\uff0cdBc\u76f8\u5bf9\u4e8e\u8f7d\u6ce2(Carrier)\u529f\u7387\u800c\u8a00\u3002\u5728\u8bb8\u591a\u60c5\u51b5\u4e0b\uff0c\u7528\u6765\u5ea6\u91cf\u8f7d\u6ce2\u529f\u7387\u7684\u76f8\u5bf9\u503c\uff0c\u5982\u5ea6\u91cf\u5e72\u6270\uff08\u540c\u9891\u5e72\u6270\u3001\u4e92\u8c03\u5e72\u6270\u3001\u4ea4\u8c03\u5e72\u6270\u3001\u5e26\u5916\u5e72\u6270\u7b49\uff09\u4ee5\u53ca\u8026\u5408\u3001\u6742\u6563\u7b49\u7684\u76f8\u5bf9\u91cf\u503c\u3002\u5728\u91c7\u7528dBc\u7684\u5730\u65b9\uff0c\u539f\u5219\u4e0a\u4e5f\u53ef\u4ee5\u4f7f\u7528dB\u66ff\u4ee3\u3002<\/span><\/section>\n

 <\/strong><\/span><\/p>\n

\n
\n
\n
\n
\n
\n
\n
\u5b9e\u7528\u8d44\u6599\u2014\u2014\u5173\u4e8e\u5929\u7ebf\u589e\u76ca\u53ca\u5176\u8003\u91cf<\/strong><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n<\/p>

\u5728\u65e0\u7ebf\u901a\u8baf\u7684\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u4e3a\u6709\u6548\u63d0\u9ad8\u901a\u8baf\u6548\u679c\uff0c\u51cf\u5c11\u5929\u7ebf\u8f93\u5165\u529f\u7387\uff0c\u5929\u7ebf\u4f1a\u505a\u6210\u5404\u79cd\u5e26\u6709\u8f90\u5c04\u65b9\u5411\u6027\u7684\u7ed3\u6784\u4ee5\u96c6\u4e2d\u8f90\u5c04\u529f\u7387\uff0c\u7531\u6b64\u5c31\u5f15\u7533\u51fa\u201c\u5929\u7ebf\u589e\u76ca\u201d\u7684\u6982\u5ff5\u3002\u7b80\u5355\u8bf4\uff0c\u5929\u7ebf\u589e\u76ca\u5c31\u662f\u6307\u4e00\u4e2a\u5929\u7ebf\u628a\u8f93\u5165\u7684\u5c04\u9891\u529f\u7387\u96c6\u4e2d\u8f90\u5c04\u7684\u7a0b\u5ea6\uff0c\u663e\u7136\uff0c\u5929\u7ebf\u7684\u589e\u76ca\u4e0e\u5176\u65b9\u5411\u56fe\u7684\u5173\u7cfb\u5f88\u5927\uff0c\u4e3b\u74e3\u8d8a\u7a84\u3001\u526f\u74e3\u8d8a\u5c0f\u7684\u5929\u7ebf\u5176\u589e\u76ca\u5c31\u8d8a\u9ad8\uff0c\u800c\u4e0d\u540c\u7ed3\u6784\u7684\u5929\u7ebf\uff0c\u5176\u65b9\u5411\u56fe\u7684\u5dee\u522b\u662f\u5f88\u5927\u7684\u3002<\/span><\/section>\n

\n<\/p>

\u5728\u901a\u8baf\u6280\u672f\u9886\u57df\uff0c\u4e0e\u5176\u5b83\u8003\u91cf\u529f\u7387\u3001\u7535\u5e73\u7b49\u53c2\u6570\u7684\u91cf\u503c\u540c\u6837\uff0c\u5929\u7ebf\u589e\u76ca\u4e5f\u91c7\u7528\u76f8\u5bf9\u6bd4\u8f83\u5e76\u53d6\u5bf9\u6570\u7684\u7b80\u5316\u6cd5\u6765\u8868\u793a\uff0c\u5177\u4f53\u8ba1\u7b97\u65b9\u6cd5\u4e3a\uff1a\u5728\u67d0\u4e00\u65b9\u5411\u5411\u67d0\u4e00\u4f4d\u7f6e\u4ea7\u751f\u76f8\u540c\u8f90\u5c04\u573a\u5f3a\u7684\u65f6\uff0c\u5bf9\u65e0\u635f\u8017\u7406\u60f3\u57fa\u51c6\u5929\u7ebf\u7684\u8f93\u5165\u529f\u7387\u4e0e\u5f85\u8003\u91cf\u5929\u7ebf\u7684\u8f93\u5165\u529f\u7387\u7684\u6bd4\u503c\u53d6\u5bf9\u6570\u540e\u4e58\u4ee510 \uff08G\uff1d10lg(\u57fa\u51c6Pin\/\u8003\u91cfPin)\uff09\uff0c\u5373\u79f0\u4e3a\u8be5\u5929\u7ebf\u5728\u8be5\u70b9\u65b9\u5411\u7684\u589e\u76ca\u3002\u5e38\u7528\u8861\u91cf\u5929\u7ebf\u589e\u76ca\u7684\u5355\u4f4d\u662fdBi\u548cdBd\u3002\u5bf9\u4e8edBi\uff0c\u5176\u57fa\u51c6\u4e3a\u7406\u60f3\u7684\u70b9\u6e90\u5929\u7ebf\uff0c\u5373\u4e00\u4e2a\u771f\u6b63\u610f\u4e49\u4e0a\u7684\u201c\u70b9\u201d\u6765\u4f5c\u5929\u7ebf\u589e\u76ca\u7684\u5bf9\u6bd4\u57fa\u51c6\u3002\u7406\u60f3\u70b9\u6e90\u5929\u7ebf\u7684\u8f90\u5c04\u662f\u5168\u5411\u7684\uff0c\u5176\u65b9\u5411\u56fe\u662f\u4e2a\u7406\u60f3\u7684\u7403\uff0c\u540c\u4e00\u7403\u9762\u4e0a\u6240\u6709\u70b9\u7684\u7535\u78c1\u6ce2\u8f90\u5c04\u5f3a\u5ea6\u5747\u76f8\u540c\uff1b\u5bf9\u4e8edBd\uff0c\u5176\u57fa\u51c6\u5219\u4e3a\u7406\u60f3\u7684\u5076\u6781\u5b50\u5929\u7ebf\u3002\u56e0\u5076\u6781\u5b50\u5929\u7ebf\u662f\u5e26\u6709\u65b9\u5411\u6027\u7684\uff0c\u6545\u4e8c\u8005\u6709\u4e2a\u56fa\u5b9a\u7684\u6052\u5dee2.15\u53730dBd=”2″.15dBi\u3002<\/span><\/section>\n
 <\/span><\/section>\n
\u9700\u8981\u8bf4\u660e\u7684\u662f\uff0c\u901a\u5e38\u6240\u8bf4\u7684\u201c\u5168\u5411\u5929\u7ebf\u201d\u4e0d\u662f\u4e25\u683c\u7684\u8bf4\u6cd5\uff0c\u5168\u5411\u5929\u7ebf\u5e94\u6307\u5728\u4e09\u7ef4\u7acb\u4f53\u7a7a\u95f4\u7684\u5168\u5411\uff0c\u4f46\u5de5\u7a0b\u754c\u4e5f\u5f80\u5f80\u628a\u67d0\u4e2a\u5e73\u9762\u5185\u65b9\u5411\u56fe\u4e3a\u5706\u5468\u7684\u5929\u7ebf\u79f0\u4e3a\u5168\u5411\u5929\u7ebf\uff0c\u5982\u97ad\u72b6\u5929\u7ebf\uff0c\u5b83\u5728\u5f84\u5411\u7684\u4e3b\u74e3\u662f\u5706\uff0c\u4f46\u4ecd\u6709\u8f74\u5411\u7684\u526f\u74e3\u3002<\/span><\/section>\n
 <\/span><\/section>\n
\u5e38\u89c1\u5929\u7ebf\u7684\u589e\u76ca\uff1a\u97ad\u72b6\u5929\u7ebf6\uff0d9dBi\uff0cGSM\u57fa\u7ad9\u7528\u516b\u6728\u5929\u7ebf15\uff0d17dBi\uff0c\u629b\u7269\u9762\u5b9a\u5411\u5929\u7ebf\u5219\u5f88\u5bb9\u6613\u505a\u523024dBi\u3002<\/span><\/section>\n
 <\/span><\/section>\n
\u65e0\u7ebf\u7535\u53d1\u5c04\u673a\u8f93\u51fa\u7684\u5c04\u9891\u4fe1\u53f7\uff0c\u901a\u8fc7\u9988\u7ebf\uff08\u7535\u7f06\uff09\u8f93\u9001\u5230\u5929\u7ebf\uff0c\u7531\u5929\u7ebf\u4ee5\u7535\u78c1\u6ce2\u5f62\u5f0f\u8f90\u5c04\u51fa\u53bb\u3002\u7535\u78c1\u6ce2\u5230\u8fbe\u63a5\u6536\u5730\u70b9\u540e\uff0c\u7531\u5929\u7ebf\u63a5\u6536\u4e0b\u6765\uff08\u4ec5\u4ec5\u63a5\u6536\u5f88\u5c0f\u5f88\u5c0f\u4e00\u90e8\u5206\u529f\u7387\uff09\uff0c\u5e76\u901a\u8fc7\u9988\u7ebf\u9001\u5230\u65e0\u7ebf\u7535\u63a5\u6536\u673a\u3002\u56e0\u6b64\u5728\u65e0\u7ebf\u7f51\u7edc\u7684\u5de5\u7a0b\u4e2d\uff0c\u8ba1\u7b97\u53d1\u5c04\u88c5\u7f6e\u7684\u53d1\u5c04\u529f\u7387\u4e0e\u5929\u7ebf\u7684\u8f90\u5c04\u80fd\u529b\u975e\u5e38\u91cd\u8981\u3002<\/span><\/section>\n
 <\/span><\/section>\n
\n
\n
\n
\n
\n

Tx\u662f\u53d1\u5c04\uff08Transmits \uff09\u7684\u7b80\u79f0\u3002\u65e0\u7ebf\u7535\u6ce2\u7684\u53d1\u5c04\u529f\u7387\u662f\u6307\u5728\u7ed9\u5b9a\u9891\u6bb5\u8303\u56f4\u5185\u7684\u80fd\u91cf\uff0c\u901a\u5e38\u6709\u4e24\u79cd\u8861\u91cf\u6216\u6d4b\u91cf\u6807\u51c6\uff1a<\/span><\/p>\n

1\u3001\u529f\u7387\uff08W \uff09: \u76f8\u5bf91 \u74e6\uff08Watts \uff09\u7684\u7ebf\u6027\u6c34\u51c6\u3002\u4f8b\u5982\uff0cWiFi \u65e0\u7ebf\u7f51\u5361\u7684\u53d1\u5c04\u529f\u7387\u901a\u5e38\u4e3a0.036W \uff0c\u6216\u8005\u8bf436mW \u3002<\/span><\/section>\n
2\u3001\u589e\u76ca\uff08dBm \uff09:\u76f8\u5bf91 \u6beb\u74e6\uff08milliwatt \uff09\u7684\u6bd4\u4f8b\u6c34\u51c6\u3002\u4f8b\u5982WiFi \u65e0\u7ebf\u7f51\u5361\u7684\u53d1\u5c04 \u589e\u76ca \u4e3a15.56dBm \u3002<\/span><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n<\/p>

\u4e24\u79cd\u8868\u8fbe\u65b9\u5f0f\u53ef\u4ee5\u4e92\u76f8\u8f6c\u6362\uff1a<\/span><\/section>\n
1\u3001dBm = 10 x log[ \u529f\u7387mW]<\/span><\/section>\n
2\u3001mW = 10[ \u589e\u76cadBm \/ 10 dBm]<\/span><\/section>\n
<\/section>\n
\u5728\u65e0\u7ebf\u7cfb\u7edf\u4e2d\uff0c\u5929\u7ebf\u88ab\u7528\u6765\u628a\u7535\u6d41\u6ce2\u8f6c\u6362\u6210\u7535\u78c1\u6ce2\uff0c\u5728\u8f6c\u6362\u8fc7\u7a0b\u4e2d\u8fd8\u53ef\u4ee5\u5bf9\u53d1\u5c04\u548c\u63a5\u6536\u7684\u4fe1\u53f7\u8fdb\u884c\u201c\u653e\u5927\u201d\uff0c\u8fd9\u79cd\u80fd\u91cf\u653e\u5927\u7684\u5ea6\u91cf\u6210\u4e3a \u201c\u589e\u76ca\uff08Gain\uff09\u201d\u3002\u5929\u7ebf\u589e\u76ca\u7684\u5ea6\u91cf\u5355\u4f4d\u4e3a\u201cdBi \u201d\u3002\u7531\u4e8e\u65e0\u7ebf\u7cfb\u7edf\u4e2d\u7684\u7535\u78c1\u6ce2\u80fd\u91cf\u662f\u7531\u53d1\u5c04\u8bbe\u5907\u7684\u53d1\u5c04\u80fd\u91cf\u548c\u5929\u7ebf\u7684\u653e\u5927\u53e0\u52a0\u4f5c\u7528\u4ea7\u751f\uff0c\u56e0\u6b64\u5ea6\u91cf\u53d1\u5c04\u80fd\u91cf\u6700\u597d\u540c\u4e00\u5ea6\u91cf\uff0d\u589e\u76ca\uff08dB \uff09\uff0c\u4f8b\u5982\uff0c\u53d1\u5c04\u8bbe\u5907\u7684\u529f\u7387\u4e3a100mW \uff0c\u621620dBm\uff1b\u5929\u7ebf\u7684\u589e\u76ca\u4e3a10dBi \uff0c\u5219:<\/span><\/section>\n
 <\/span><\/section>\n

\u53d1\u5c04\u603b\u80fd\u91cf\uff1d\u53d1\u5c04\u529f\u7387\uff08dBm \uff09\uff0b\u5929\u7ebf\u589e\u76ca\uff08dBi \uff09
                \uff1d20dBm \uff0b10dBi
                \uff1d30dBm
      \u6216\u8005:  \uff1d1000mW
                \uff1d1W<\/span><\/p>\n

<\/section>\n
\u5728\u201c\u5c0f\u529f\u7387\u201d\u7cfb\u7edf\u4e2d\uff08\u4f8b\u5982\u65e0\u7ebf\u5c40\u57df\u7f51\u7edc\u8bbe\u5907\uff09\u6bcf\u4e2adB \u90fd\u975e\u5e38\u91cd\u8981\uff0c\u7279\u522b\u8981\u8bb0\u4f4f\u201c3 dB \u6cd5\u5219\u201d\u3002\u6bcf\u589e\u52a0\u6216\u964d\u4f4e3 dB \uff0c\u610f\u5473\u7740\u589e\u52a0\u4e00\u500d\u6216\u964d\u4f4e\u4e00\u534a\u7684\u529f\u7387\uff1a<\/span><\/section>\n
 <\/span><\/section>\n
\n
\n
\n
\n
\n
-3 dB = 1\/2 \u529f\u7387<\/span><\/section>\n
\u200d\u200d\u200d\u200d\u200d\u200d-6 dB = 1\/4 \u529f\u7387<\/span><\/section>\n
+3 dB = 2x \u529f\u7387<\/span><\/section>\n
+6 dB = 4x \u529f\u7387<\/span><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

 <\/span><\/p>\n

\u4f8b\u5982\uff0c100mW \u7684\u65e0\u7ebf\u53d1\u5c04\u529f\u7387\u4e3a20dBm \uff0c\u800c50mW \u7684\u65e0\u7ebf\u53d1\u5c04\u529f\u7387\u4e3a17dBm \uff0c\u800c200mW \u7684\u53d1\u5c04\u529f\u7387\u4e3a23dBm \u3002<\/span><\/section>\n

 <\/span><\/p>\n

\u529f\u7387\/\u7535\u5e73\uff08dBm\uff09\uff1a\u653e\u5927\u5668\u7684\u8f93\u51fa\u80fd\u529b\uff0c\u4e00\u822c\u5355\u4f4d\u4e3aW\u3001mW\u3001dBm\u3002dBm\u662f\u53d61mW\u4f5c\u57fa\u51c6\u503c\uff0c\u4ee5\u5206\u8d1d\u8868\u793a\u7684\u7edd\u5bf9\u529f\u7387\u7535\u5e73\u3002<\/span><\/section>\n
<\/section>\n
\n
\n
\n
\n
\n
\u6362\u7b97\u516c\u5f0f\uff1a<\/span><\/section>\n
\u7535\u5e73\uff08dBm\uff09=10lgW<\/span><\/section>\n
5W  \u219210lg5000  = 37dBm<\/span><\/section>\n
10W \u219210lg10000 = 40dBm<\/span><\/section>\n
20W \u219210lg20000 = 43dBm<\/span><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\n<\/p>

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