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Coaxial feed loop antenna in HFSS

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ycwu

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Hi everyone,

I got a question about my coaxial feed loop antenna design in HFSS. My setup is as listed:
1 Wave port excitation, 50ohm normalization with integral line
2.one end of loop is connected to the center pin while the other end to the outer jacket of cable
3. The S11 is weird, and the Jsf plot shows that the energy doesn't go to the loop part

I don't know where I got wrong, any help or comments are appreciated. Thank you!

All.jpg
Jsf.jpg
S11.png
 

Your cable impedance is 50 Ohm, port impedance is 50 Ohm likely and impedance of your antenna is small ohms of fraction of ohm. Mismatch, energy does not go into antenna.
 

Question is why you designed the antenna far from 50 ohm impedance? Plotting S11 magnitude hides important information, you better plot complex S11 or Z11 to see the actual antenna impedance
 

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