Offhand, I'd be tempted to use an interdigital filter. There was a nice
article about this, including a computer program in basic for the
caculations in Ham Radio magizine, Ummm... November 1985 (?).

I used this in a 2400 MHz filter I needed one time and I found the skirt
selectivity to be pretty good. Of course, like a lot of wavelength
related filters, it had harmonic responses, but a low pass filter fixed that
quite nicely.



Jim Pennell
N6BIU

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21:05 Pacific Time Zone
Oct 20 2006

International Time
04:05 UTC
21.10.2006