Low Profile Folded Transmitarray Antenna with Quadruple Planar Feeds at Ka-Band

摘要

A high-gain low-profile quadruple-feed folded transmitarray antenna (QF-FTA) is investigated. It consists of three parts, including a transmitarray, a reflectarray (RA), and four identical 2×2 microstrip patch antenna feeds that are placed on the surface of the RA. As an example, a QF-FTA operates at ka-band is designed and simulated. To demonstrate the advanced performance of the QF-FTA, another two different antennas, a single-feed transmitarray antenna (TA) and a single-feed FTA, were carried out for comparison. It is demonstrated that the use of quad feeds allows the reduction of the antenna height by nearly six times, as compared to the single-feed TA while maintaining a similar radiation performance.