>This was recently posted on rec.radio.amateur.antenna.
>
>Roy Lewallen
>
> ----------------
Thank you Roy. The one interesting feature of the CFA is its
impedance. The port impedances I calculate are of the order of 200
ohms resistive and capacitive reactive.
Brian Stewart keeps telling me that the impedances are readily
measured --- real impedances. But the impedances I calculate are real
--- impedance measurement alone does not tell us which direction power
is going.
Clearly these resistive components of the impedances are more
favourable to match, and better from a BW point of view, compared with
the small fractions of an ohm for the self impedances (resistive
component) of the disc and cylinder.
The problem is the large circulating powers --- and the poor radiation
efficiency.
73, Jack, VE2CV
_____________________________________________
John S. (Jack) Belrose, PhD Cantab, VE2CV
Senior Radioscientist
Radio Sciences Branch
Communications Research Centre
PO Box 11490 Stn. H
OTTAWA ON K2H 8S2
CANADA
TEL 613-998-2779
FAX 613-998-4077
e-mail <john.belrose_at_crc.ca>
_____________________________________________
Received on Tue May 25 1999 - 19:39:53 EDT
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