my opinion, using Notch filter a bandstop characteristic can be seen in patch antenna. That is creating slot of various shapes and sizes on the patch antenna. Another way may be by adding open stub along the microstrip transmission line. But they are basically narrow band in nature.

Dear Ali Najdet,

I agree with what Arshad Salih mentions regarding ading open stubs along with the MSTL for NW applications.

You can use SIW technology to design band-pass filter and antenna on same substrate.

Article Tunable SIW bandpass filter-combined microstrip antenna base...

Please, I need the source of HFSS program, FEKO and CST programs

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