Need help - tri-band antenna design

Dear all,

I am going to design a tri-band patch antenna, it's a rectangular patch with a probe and a shorting pin at the right upper corner. Could you advise me how to cut the slot that can achieve tri-band operation.

Thanks,

Best regards

you can refer the book "Compact and Broadband Microstrip Antennas"

In the book, you can find much shape for multiband antenna.

try L shaped slot on the lower left side of the patch to get tri band radiation