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Question about modelling varactor in CST - Tunable patch antenna

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vbehzadan

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Hi,
I have designed an SIW cavity backed rectangular patch and would like to change its resonance frequency by using a varactor. The simulation package I'm using is CST MWS. What I have done is I've inserted an inductive post (a conductive via) somewhere near one radiating edge of the patch, and then added a lumped capacitor in series with one edge and the post. To see the effect of the varactor, I just change the capacitance value of the element. Does this seem right to you? If not, could you please advise me on the matter?
 

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