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Adding Box in Momentum Filter simulation

Question asked by cnhoff on Aug 10, 2009

i have simulated a edge coupled bandpass filter in Momentum. The results are good. Then i added a top ground layer (i.e. a metallic lid) to my design, still good. In the next step i added a box to simulate the metallic sidewalls of my case. The ports are placed directly on the end of the feedline and also on the box line. No errors while simulating.

The problem is, i get 0dB reflection and -80dB transmission in the passband. Seems like the box short circuits the ports. What did i do wrong?

Thanks for your help!