How to simulate voltage at the antenna tuner ?

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How to simulate voltage at the antenna tuner ?

Post by igor78000 » Wed 14 Apr 2021, 10:18

Hello Forum.
I am redesigning a tunable IFA antenna with a shunt capacitor tuning and an RF switch. Because we want to use the antenna for GSM as well as LTE, I need to find out if the voltage over the switch is too high. GSM-900 input power to the antenna is 2W instead of 0.2W for LTE.
I have a problem where I need to find out the voltage at the IFA antenna tuning pin. I have tried the voltage probe but the resulting voltage is very low. Is it possible to define the feeding port power to fx. 2 W? Furthermore, I have tried to use a passive port in series with the tunable capacitor but the values of s21 do not look correct.

I am open to any suggestions.
B.R. Igor

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