天線簡介Zin = Zo l Zin Z0:S§ Zin:é¤J§ ] :ì±`,P°TifY°] = 2 l:é× ZLZL + jZ0tan(] Z0 + jZLtan(]l) l)/f= §CW°Ti¤jóéu×A3*108 103 4= 1.5 105 ¤ l/f~=0§Y]l=0 Atan(]l)0AGZin =ZL Gb¤R§CWqAiH¤{éuW R > 3Wa=1.8WDouter Z0 = 138 logDouter DinnerDinnerOutersuU¨hRadiationU ¤jAy¨insertion loss U¤jA suU±K¨insertion loss U¤pRF Connectors ImpedanceZ0 = 60lnD/d RF Connector¤W-v fu = 2c/( k D+d)`L= f / 4 Zin Require Z0 f Zin = Z0 f/4 /4ZL = ZinZL/4Apply to real loads and sources Perfect match at spot frequency(10%-20% useable bandwidth)ZL + jZ0 f Z0 f/4tan(]l) l)+ jZLtan(]] Z0 fl=(2/4=)(f /4)= ZinZLImpedance Match Rule¨pLêpL¨pqeêpCSleeve Dipole AntennaThe current distribution of sleeve antenna is like the dipole antennaDipole A……
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