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Zin=Z0*(1+S11)/(1-S11).How did you know that the radiation resistance is more than Zo? Thanks.
If we can ignore copper loss, dielectric loss, matching element loss, guided loss, etc., real(Zin) is equal to radiation resistance.Radiation resistance is something special,
what you discuss here is input resistance.
If we can ignore copper loss, dielectric loss, matching element loss, guided loss, etc., real(Zin) is equal to radiation resistance.
Even if we use low loss substrate such as Teflon, loss due to surface wave is fairly large for patch antenna.For patch antennas on FR4, we have large dielectric loss.
Even if loss is not zero, real(Zin) is close to radiation resistance in many cases.
Even if we use low loss substrate such as Teflon, loss due to surface wave is fairly large for patch antenna.