A gain-enhanced patch antenna using a ghost reversal source

The gain of a patch antenna is enhanced by the introduction of a proposed slot cut onto the center of the patch as a “ghost” reversal source. Compared with original patch antenna, the proposed slotted patch features the higher gain by 0.6 dBi with narrower beamwidth by 3° and 5° at E and H-planes, respectively. As example, a patch array with the 2×2 proposed patch elements is designed at 4.45 GHz. The simulation and measurement show that compared with conventional patch arrays, the proposed array prototype achieves 20 % gain enhancement with the half-power beamwidth decrement of 9° and 5° at E and H-planes, respectively.