strange problem in circular waveguide simulation by HFSS
时间：03-31
整理：3721RD
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Hi every body!
I have encounterd a strange problem in simulating an ordinary circular wave guide in HFSS,The problem is that when the length of the circular wave is equal to lambda of the guided mode in waveguide (for the dominant mode(TE11) ) S21 will have a very sharp decrease in this frequency.please note that this can not be related to the higher order modes because i have test this by using a frequency range that is well below the cut off of the other modes.also using field integration lines can not solve this problem.
as an example for a circular waveguide with radius of 10.8mm
and length of about 59mm the frequency with a sharp decrease in S21 is about 9.6ghz.in the attachment you can find the hfss file and also the simulation results.
Thank you very much for your help .
I have encounterd a strange problem in simulating an ordinary circular wave guide in HFSS,The problem is that when the length of the circular wave is equal to lambda of the guided mode in waveguide (for the dominant mode(TE11) ) S21 will have a very sharp decrease in this frequency.please note that this can not be related to the higher order modes because i have test this by using a frequency range that is well below the cut off of the other modes.also using field integration lines can not solve this problem.
as an example for a circular waveguide with radius of 10.8mm
and length of about 59mm the frequency with a sharp decrease in S21 is about 9.6ghz.in the attachment you can find the hfss file and also the simulation results.
Thank you very much for your help .