We propose a novel array antenna with high aperture efficiency by employing an array\nelement operating in a high-order mode to improve the transmission efficiency of wireless power\ntransmission applications. The proposed array element, operating at a frequency of 5.8 GHz, consists of\na square patch with four metallic shorting pins, an extended cavity, and a high dielectric superstrate.\nThe four metallic shorting pins derive the high-order operation, which can enhance the bore-sight\ngain, resulting in the high aperture efficiency of the array. The extended cavity structure can help\nfurther improvement the aperture efficiency and minimize the mutual coupling strength between\nadjacent elements. The proposed antenna element is extended...................
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