Is there any techniques to reduce cross polarisation and increasing gain in weabale patch antenna?

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Яков Аронович Рейзенкинд

Are you mean Wearable patch antenna?

Teja Sankar

yes preferably equilateral triangular patch antenna

Siddhant Sahoo

If you cut slot in the Ground plane it will help you reduce the cross polarization.

Arup Ray

There are many IEEE papers. Check the website IEEE xplore. Irrespective of weather your patch antenna is wearable or not, cross polarization reduction is pertinent to most planar (and microstrip patch) antennas.