Millimeter-wave wide-band high-efficiency single-layer reflectarray antenna with ability of phase-response restructuration

摘要

This work presents a single-layer millimeter-wave wide-band high-efficiency reflectarray antenna with the subwavelength element based on the partialoptimization method. A three-loop subwavelength element with the unchanged parasitic outer-ring is used to guarantee the design accuracy and depress the dispersion influence. Then, the partition-optimization method is used to restructure the element phase-response characteristic. The proposed design method is beneficial to expand the reflectarray antenna bandwidth and achieve the high efficiency, especially for the large-aperture reflectarray antenna. A center-fed reflectarray antenna is designed and fabricated at the center frequency of 34 GHz. The measured gain of the proposed reflectarray antenna is 35.4 dBi with the 1 dB gain bandwidth of 20.3%, that is, from 32.3 GHz to 39.2 GHz. The proposed reflectarray antenna can keep the stable radiation pattern for a multi-band wireless backhaul system.