# How to excite TE21 mode in circular waveguide with HFSS

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#### mianjuyan

##### Newbie level 4
Hi,guys

I am trying to correctly excite the TE21 mode in circular waveguide with HFSS. I set the number of modes as 5. The first two correspond to TE11 mode. And the third one corresponds to TM01 mode. The last two corrspond to TE21 mode. I used two perpendicular integration lines for TE11 mode, one integration line for TM01 mode, and again two perpendicular integration lines for TE21 mode. But the simulation failed to meet the convergence after many passes. I believe there should be something wrong with the integration lines. Could someone tell me how to do this? i really need your help.