Dears,
I have a multisection antenna and I need to calculate the input impedance at every section, How can I do that by using CST software?
Sincerely,
--
Hayder S. Ahmed
Use a waveguide port. It will tell you the impedance of the feed line (it calculates it) and the S11 will give the input impedance. You can change the reference plane to simulate different feed lengths.
Use a waveguide port. It will tell you the impedance of the feed line (it calculates it) and the S11 will give the input impedance. You can change the reference plane to simulate different feed lengths.
I have a multi-section antenna and need the input impedance at each section.
S11 will give me the input impedance of all antenna.
Use a waveguide port at the input of each section, if possible - that is what I meant.
If a section doesn't have a long enough feed, then you can make the feed longer and then change the reference plane to find the impedance at the length you want it.
If it is 50ohm resistance for matching load, u can calculate the value manually. Refer Balanis sir book, page 825 onwards
You might try to use a waveguide port attached to the 50 ohm input line and then computing (post processing) the TDR - it will give the impedance profile of your structure (against time, as its usual in reflectometry).
Dear Dr. Malcolm,
I understand you. One section is fractal geometry and doesn't have feed line.
Can I use waveguide port directly?
Dear Dr. Mohan,
Thank you so much for your interest.
One section is fractal geometry. How I can calculate it manually?
Dear Dr. Marcelo,
Than you so much for your interest.
I will try your method. But is this method take me the input impedance at each section?
If you extend the input of the fractal port outwards you then have a line for a waveguide port and you can move the reference plane in post processing to the true input. Depending on how long it is uniform cross section you may be able to put a waveguide port on it directly.
Hayder S. Ahmed CST will calculate automatically, once radiation pattern formed after simulation.
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