I have designed 2x2 and 2x4 circular patch antenna arrays operating at 2.4GHz. To further improve antenna performance(gain) i have introduced air gap layer between substrate and ground plane. But that has shifted the resonant frequency towards right (between 3GHz to 3.5GHz). How do i reduce or bring back the resonant frequency to 2.4GHz without changing Patch dimensions, effective permittivity or substrate height?
To further improve antenna performance(gain) i have introduced air gap layer between substrate and ground plane. But that has shifted the resonant frequency towards right (between 3GHz to 3.5GHz).
This is expected, because you have lowered the effective permittivity of the substrate (mixture of er=1 and PCB).
You need to compensate that by larger patch dimensions, or higher PCB permittivity.
This is expected, because you have lowered the effective permittivity of the substrate (mixture of er=1 and PCB).
You need to compensate that by larger patch dimensions, or higher PCB permittivity.
Yes but once an antenna is fabricated Patch dimensions, permittivity, substrate height cannot be changed. So i need external controlling factor for tuning frequency of antenna. Looking for other options like slots, DGS, diode etc not sure which one would help.