Stacked Microstrip Patch Antenna Array with High-Gain and Improved Thermal-Stability for Microwave Power Transmission Applications

This paper presents a stacked patch antenna array that operates at a 5.8 GHz of ISM band for microwave power transmission (MPT) applications. The stacked patch antenna consists of three layers that include a circular patch antenna with an air-gap, a stacked parasitic patch, and a feed network. Each patch has a crossed-slot to form the right-handed circular polarization. A 2 x 2 element array has been made up of the stacked patch antennas connected with a sequentially rotated feed-network. The measured axial ratio and gain of a 2 x 2 array are 1.08 dB and 11.6 dBic at 5.8 GHz. The feed network has been printed on a substrate with a relatively high thermal-conductivity to withstand high-power. The thermal analysis of the feed network is compared with cases of substrates.