Hello everyone,
I am working on different types of feeds in Rectangular Patch Antenna Design and was able to succeed with basic feeds namely Microstrip and Coax feed but was not able to obtain proper result for proximity coupling feed. I am not aware whether I doing it correct or not. For your kind reference I have attached my project file to this message. Any help would be kindly appreciated.

Problem I am facing: Low return loss (Max : of -8dB).

Hope to hear from you soon.

Yours sincerely
Pavan Kumar Akula.