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#9
February 20th 08, 09:40 AM
posted to rec.radio.amateur.antenna
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Horizontal loop antenna
Roy Lewallen wrote:
"Perhaps you build antennas for radiation resistance, but I think most people build them to maximize radiation in some particular direction.." You must have some radiation resistance or you have no signal, but not all antennas are highly directional. Page 8-10 of the 20th edition of the ARRL Antenna Book has (Eq 5): Efficiency = radiation resistance / radiation resistance + loss resistance Zero radiation resistance = zero efficiency. Best regards, Richard Hsarrison, KB5WZI |
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