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Circularly Polarized Patch Antenna: Axial Ratio coming out poor at larger angles

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Guruditya Sinha

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Hi,
Scenario

I have been trying to get a patch antenna designed with a circular polarization for axial ratio < 2dB between the +/- 70 degrees. The axial ratio is quite good upto +/-50 degrees. After that, it goes to 4dB axial ratio. The gain is not really a concern anymore, as that has been optimized.

The patch is a truncated probe fed patch antenna.

Query:
Was hoping to know if there are any suggestions/design inputs on how I could improve the axial ratio for angles upto +/-70 degrees.
 

Hi,
Scenario

I have been trying to get a patch antenna designed with a circular polarization for axial ratio < 2dB between the +/- 70 degrees. The axial ratio is quite good upto +/-50 degrees. After that, it goes to 4dB axial ratio. The gain is not really a concern anymore, as that has been optimized.

The patch is a truncated probe fed patch antenna.

Query:
Was hoping to know if there are any suggestions/design inputs on how I could improve the axial ratio for angles upto +/-70 degrees.

As you approach the horizon, horizontal polarization gets shorted leaving only vertical. Even vertical gets curtailed if ground plane is finite.
 

Hi,
I have tried various methods. Can you direct me to a good resource for a AR<3dB for the Patch antenna?
Really finding too many dead ends. :/

Regards
Guruditya Sinha.
 

try to tuncate ur cornerss or add stubss...or u can try adding slot in ceneter opf patchh
 

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