Trap Dipol

Det står lite om resonemanget och lite slutsatser i slutet på artikeln du hänvisar till.


1.) Is it best to make the trap resonant close to the desired operating frequency?

NO! Loss is highest when the trap is resonant at the operating frequency!

2.) Does bandwidth decrease with increasing trap Q?

NO! Bandwidth is a function of many variables, trap Q actually has one of the smallest influences on BW.

3.) Do traps create noticeable loss, perhaps one dB per trap typically?

NO! Even the worse traps (coaxial traps) in the worse possible condition of operation are only 1.6dB loss for BOTH traps!

4.) Does higher trap operating Q always mean lower loss?

NO! Loss depends on many factors, including trap resonant frequency.

Conclusions:

Trap loss has been greatly exaggerated by advertising hype

Traps should not be resonant at the actual planned operating frequency

Coaxial traps are more lossy than articles conclude

Coaxial stubs used as capacitors can not be calculated using pF/ft unless the stub is a very small fraction of a wavelength long (less than a few electrical degrees)

Coaxial stubs have low Q (are relatively lossy) compared to normal lumped components.
 
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