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Lumped port
Posted 06.02.2018, 09:03 GMT-5 Electromagnetic Heating, RF & Microwave Engineering, Wave Optics 1 Reply
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Hello all,
I have simulated a loop antenna in COMSOL, It works at desired frequency. However, I see a great deal of mismatch in s11 curve. I've simulated the same antenna in CST and it works perfect. Both of them works at 2.4 GHz but in COMSOL: s11 @2.4 GHz is -15dB in CST: s11 @2.4GHz is -35dB I've used discrete port in CST and lumped port (uniform) in COMSOL. Can anybody help me please. I've attached some pictures.
Kind regards,
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I don't know anything about CST. But in Comsol, your specification of a 50 Ohm input cable (as I saw in your figure) is probably at least one important issue here, since your loop antenna very likely does not present a 50 Ohm impedance at its connections. I suggest you change the 50 ohm value, re-run it, and see what happens. Do a frequency sweep too. And be sure your mesh is fine enough where it needs to be, and that you have enough computational space around your loop, etc.
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