Effects of parasitic patch sizes on multi-layer electromagnetically coupled patch antenna

It is found experimentally that reducing the size of the parasitic patch can significantly change the resonant frequency, resonant input impedance, and bandwidth of the two-layer and three-layer EMCP (electromagnetically coupled patch) antennas. For antennas operating in the broadband region, the bandwidth is maximum when the parasitic and the fed patches are approximately equal in size. For antennas operating in the high-gain region, the bandwidth is maximum when both dimensions of the parasitic patch are reduced by 0.35 cm.<>