Simulation and modelling of koaxial structures

时间：03-23 整理：3721RD 点击：

Hi all

We just completed a work on simulating and modelling koaxial structures with HFSS 9.1 and Micro wave Office, issued by the University of applied Sciences Aargau/Switzerland.

Those of you who are interested may download the File (6.7MB) from the following link.

http://wanda.fh-aargau.ch/e/projekte...ad/SemArb6.pdf

It's written in german and discusses S-Params, Mesh-Operations and theoretical basics and modelling of coaxial waveguides (used for 500kW radion transmitters).

D.

Hy, I've tried to simulate the more simple structure of coaxial that appear in the pdf, but the parameters S aren't correct for me. Moreover, I don't Know How to calculate the Capacitance.
My design is the next. What's wrong?

Thank's for all.

sandruska
what did you try to simulate? why do you use quarter of the coax?
can you explain...?

sandruska
what did you try to simulate? why do you use quarter of the coax?
can you explain...?

Hy, I've tried to simulate the more simple structure of coaxial that appear in the pdf, but the parameters S aren't correct for me. Moreover, I don't Know How to calculate the Capacitance.
My design is the next. What's wrong?

Thank's for all.

that's exactly what we did. there are 2 possibilities:

a) use the field calculator to calulate the Energy in the E-Field and therafter calculate the Capacitance. (shown in the cookbook)

b) export the s-parameters. import them in a sim. like ansoft designer or micro wave office by AWR (we used the latter). then construct a equivalent circuit and adjust the C until the S-params. match.

By the way: don't forget to set up the impedance mulitplier correct if you calculate only a quarter of the waveguide.

D.