Can anyone explain what migh cause different results in driven terminal and driven modal for a similar structure?
I have a 2x2 antenna array which works fine when exciting with four 50 ohm wave ports on 4 edges of the board (simulation is done in driven modal). Also, when I simulate two connectors connected to the same 50 ohm CPW transmission line separately, the results are good and similar in both driven modal and driven terminal. Also the result is good when I simulate my antenna connected to 4 connectors in driven terminal. However, the problem is that when I simulate the same design in driven modal the results are not good and different from the results I got with driven terminal.
can anyone tell me what can cause these huge difference between driven modal and driven terminal when I connect the connectors to my antenna?
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