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January 24, 2018
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waveguide cut-off and the attenuation below that

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1 week 5 days ago #895 by sm4rzw
sm4rzw created the topic: waveguide cut-off and the attenuation below that
Hi all,
In an attempt to create a ad-hoc bandpass filter (or, usable as highpass) I bolted together two WR137 waveguide-to-coax adapters. Works ok, but transmission below the theoretical cut-off is surprisingly high; Fcutoff is 4.301 GHz and at 4 Ghz I only get -17 dB -ish. Could this be improved by adding a straight piece of waveguide between them to surpress evanescent transmission ? Or some trick with an iris..?

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1 week 5 days ago #896 by Desert Sage
Desert Sage replied the topic: waveguide cut-off and the attenuation below that
Yes, small length of waveguide should work. WG below cutoff is surprisingly effective as HPF. Surprised how little rejection you are getting. If I wasn't lazy I could calculate how much guide you need but you forgot to say how much rejection you were looking for. As a guess, a couple inches should give you plenty.

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1 week 5 days ago #897 by sm4rzw
sm4rzw replied the topic: waveguide cut-off and the attenuation below that
Thanks for quick reply :) Not that used to waveguides, but I'll learn. Those wg-to-coax adapters are quite short, so the radiators inside them get's quite close, thats why I had that thought. Will try to track down a 3" or 4" WG on ebay and try it out.

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