Improving S(1,1) of an UWB Microstrip Patch Antenna

Hello All,

I am having an UWB printed circuit microstrip patch antenna. I am having these results for the real part and imaginary part of input impedance and for the S11. How can i improve the S11 to be greatly lower than -10dB mainly in the band from 7 GHz and above.

Any help is appreciated.

Kawther

what is your antenna? some special antenna can get so VSWR.

I'd say your return loss plot is reasonably good.

"UWB" patch antennas achieve broadband operation by a combination of multiple segments, but they are by nature poor compared to true broadband antenna designs like logper. In so far 10-15 dB S11 seems fair.

It's probably possible to do something for the upper frequency band by adding segments that resonate in this range and tune all dimensions iteratively for more uniform S11.