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So what you are saying Dale is that a bicone antenna is a good wideband
antenna? Do they exhibit any gain? "Dale Parfitt" wrote in message news:uSQgd.874$cA4.853@trnddc01... Snip... We're using different definitions of "resonant". The definition I use says that an antenna can only resonate on a frequency. (Pretty much, the frequency a dip meter will indicate when coupled to the antenna.) It can have a bandwidth over which it can be used, but the resonant point is (usually) one single frequency. Discones look like dipoles with the 2 legs being different lengths, so the best one could say - using my definition - is that they "resonate" on the frequency at which the disc is 1/2 wavelength in diameter and the frequency at which the cone element length is 1/4 wavelength. But they probably are the best tradeoff for multi-band scanning. Let's use an accepted engineering definition- resonance is defined when the input Z has zero reactance- a properly designed discone (disc and cone- not a skeletal version) is virtually reactance free over a very wide band. Discones may look like dipoles- although you really have to be imaginitive, is a derivative of the bicone antenna (replace the disk with another cone). With proper included cone angle and proper machining of the junction (this limits hi end performance) it is a wonderfully broadbanded antenna. Dale W4OP |
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