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Old 1-May-2011, 6:44 PM   #16
retired17
Junior Member
 
Join Date: Mar 2011
Location: anaheim, ca
Posts: 13
Quote:
Originally Posted by Dave Loudin View Post
You are onto something, but don't think of it as a match to the transmission line. Think about how the signals received by the different elements add up in strength and in phase (the underlying principle of antenna design.) This page at Ken Nist's site has excellent pictorial descriptions of what you're after.
I was looking at Ken Nist's hdtvprimer site where he was explaining why the net gain of an antenna may be less than the raw gain of an antenna. He stated that because of the complex impedances, there is a transmission line mismatch and some of the signal is reflected and re-radiated. I don't understand why but the raw and net gain plots of the CM4221 look the same to me but the plots of the CM4228 were different. Could be something in the CM4228 combiner plus the transmission line mismatch.
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