Mutual Coupling between Shorted Patch Antennas

This paper studies the mutual coupling between shorted patch antenna (SPA) elements. Both the quarter-wave shorted patch antennas and the gap-coupled shorted patch antennas (CSPA) are investigated and compared, along with different array schemes. It is found that the mutual couplings of CSPA arrays are generally smaller than those of quarter-wave SPA arrays for the same electrical separation. Simulated results show that the CSPA exhibits 2 dB reduction of E-plane coupling and a 1.4 dB reduction of H-plane coupling for 0.5λ
0
between the array elements for specific condition.