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Evanescent Waveguide Filters - RF Cafe Forums
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| jwrigley
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Post subject: Evanescent Waveguide Filters
Posted: Wed Nov 25, 2009 3:13 pm
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Joined: Wed Nov 25, 2009
3:06 pm
Posts: 1 |
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I am attempting to design an evanescent waveguide
filter in XBAND. The a dimension for my filter waveguide
is 0.518'' and is based on the following paper:
"Evanescent Mode Compact Waveguide Filter" by
Dr Qingyuan Wang
Anyone know how to transition
into this filter? Any standard quarter wave transformer
from say, WR112, will have to involve a section
of waveguide in cutoff thereby contributing considerable
loss/attn in the passband. I've tried just butting
WR112 up against the filter for my HFSS or CST or
WASPNET run but have difficulty reproducing the
20 dB return loss presented in the paper.
Any input appreciated.
Jason Wrigley
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nubbage |
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Post subject: Re: Evanescent Waveguide Filters
Posted: Thu Nov 26, 2009 4:07 am
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| General |
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Joined: Fri Feb 17, 2006
12:07 pm
Posts: 268
Location: London UK
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Hi Jason George Craven was one of the pioneers
of evanescent mode filters and other circuit elements
realized in waveguide below cut-off. He therefore
has left a legacy of very many papers and books
on the topic, if you search on the IN for his name
I am sure you will turn up a lot of data. I found
this, for example:
http://www.physics.princeton.edu/~mcdonald/examples/EM/lewin_el_17_415_69.pdf
It discusses the equivalent circuit of the interface
to an inductive section of evanescent waveguide.
_________________
At bottom, life is all
about
Sucking in and blowing out.
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Posted 11/12/2012
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