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Harry wrote:
Hi Cecil, From "Antenna Theory" by Balanis: Rr = 2*Prad/|Io^2| = 73 ohms (4-93) I got Balanis' book and found the above formula. Thanks a lot! (Tom also mentioned the same book.) 4-94 (I have the 1982 edition) is from formula 4-70. The math is OK to me. I happen to have a PH.D. degree in math. For your "passing-out" test, calculate the radiation pattern of a two-radial groundplane antenna directly from Maxwell's equations (including the two small cross-polarized lobes that nobody else mentions), using pencil and paper only, in a pub. I've seen it done by a math professor from W6. (Nah... it must have been a party trick... he must have rehearsed that a million times... mustn't he?) When he'd finished, Charlie sat back, smiled asked for comments. The rest of us passed out. -- 73 from Ian G/GM3SEK 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co.uk/g3sek |
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