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How to design a matching network using shunt with NEC ?

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rfc

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NEC design problem

Is there any way to design a matching network using shunt elements with an nec based program? It appear that only series loads are allowed. I need a shunt negative reactance to ground at the feed point. I'm using eznec.

rfc
 

flatulent

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do you really need it in NEC

Do you really need to combine the impedance matching function with the other things you are calculating with NEC?

You can get a tablulated impedance values and then put them into a spread sheet and do your matching there. Just compute Y of the antenna input and then add your reactance and then invert the new Y to Z.
 

rfc

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The way I do it is to fine the feed point impedance, then match with a smith chart. I would like to simulate the smith chart answer using NEC to verify the result. Guess I can't!

rfc
 

rfc

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Actually you can design the match with an open stub then work backwards with a smith chart to determine capacitance. Just tried it out and it seem to work.

rfc :D
 

egliu

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Re

you should separate antenna and match networks, Using Nec, get antenna impedance firstly and design networks using any type smith chart software
 

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