Analysis and Measurement of Large Circular Transmitting Arrays for Microwave Power Transmission

Abstract

Phased arrays have been widely used in microwave power transmission. The efficiency of rectenna is closely related to the received power density. Therefore, it is necessary to accurately analyze the radiation performance of the transmitting array in order to achieve the high-efficiency power transmission. And in order to meet the long-distance and high-efficiency power transmission requirements, the transmitting array needs to have the characteristics of large electricity sizes. The direct numerical analysis method of entire array will bring huge cost in computing time and storage space. Subarray extrapolation is a method to reasonably account for the edge effects of arrays, but only for rectangular arrays. Aiming at the geometric characteristics of the array contour, this communication proposes an irregular contour recognition method. This method can expand the application of subarray extrapolation method and realizes the purpose of accurately evaluating the radiation performance of large array antennas at small calculation cost. Finally, using a large transmitting array as an example, the proposed method is verified by comparing the results of subarray extrapolation, commercial software of entire array, and the experimental measurement to validate the correctness and advancement.