How calculate the thickness of ground patch antenna ?

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Malcolm White

Not sure what you mean but this may help

https://www.microwaves101.com/encyclopedias/microstrip-patch-antennas

Rabin Kanisha

Greetings, kindly rely on the following paper the same,

Article A Compact Parasitic Ring Antenna for ISM Band Applications

Anveshkumar Nella

Ground thickness would be a standard value. Skin depth is used to calculated the limit value.

Exact value can be varying.

In general, at GHz range we consider 35um.