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hi all, we all know that there are many modes in a waveguide and each mode has its cutoff frequency above which it begins to propagate. in HFSS simulation, I try to simulate the gamma(\[ \gamma \]) for each mode. this is the waveguide measures axb=4.7mmx2.4mm. the cutoff frequency of TE21 mode is around 63GHz. the simulation is set as follows. as you can see, above 63GHz, the im（gamma） and re(gamma) hold zero. is something wrong with my simulation? tired many but in vain and waiting for any advice, thanks.