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The Equivalent Circuit - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


chan
Post subject: the equivalent circuit Posted: Wed Oct 25, 2006 10:12 am

Captain

Joined: Thu Sep 22, 2005 11:09 pm
Posts: 6
Hi,
i have a question about an equivalent circuit.who can help me?
we know that the equivalent circuit of centered post(aligned parallel to the electric field) in rectangular guide is: two capacitive reactance elements aparted by a inductive reactance element (paralleled to ground) but,if the centered post is part of coaxial line connected to the wavguide,suppose that the other terminal of coaxial line is short.what's its equivalent circuit?,only connected with coaxial line shorted another side? Mr J.F.White did that in 7th chapter of his book microwave semiconductor engineering.
when i ues the equivalent circuit in ADS ,the result is different from which simulated in CST microwave studio and ansoft HFSS.
I am puzzled,

note:
1.the structure is not the coaxial-waveguide transition we always mentioned
2.coaxial line(ordinarily air filled)

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Posted  11/12/2012

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