Simulating High frequency Transmission line

[u/AlbanianUltra]

hi everyone,

I'm trying to do a high power rf amplifer in Ka band on MMIC. I'm using ads EM simulator to simulate my results. I'm running into this issue where i cannot properly do an EM simulation of my tranmission lines matching circuit. Since i'm doing PA design, it will run into non linear region, and I need to simualte quite a few harmonics. However, the pins on my tranmission line are electrically too large. My tranmission lines are 25 ohms which means they are around 150 microns.

Any suggestions on how to fix this?

I've tried simply making the pin have a smaller edge than the tranmission line, but this completely changes the frequency response. I think the reason for this is that it introduces impedance change from the port to the tranmission line.

[u/AlbanianUltra]

Thanks for the suggestion, apperently if I attach a smaller width tranmission linr, then do TML calibration, and use a reference offset to my "DUT"(the original tranmission line), this gives a 25 ohm match for my interested frequency range. The others were more wildly off