A W-Band Circular Box-Horn Antenna Array Radiating Sum and Difference Beams With Suppressed Sidelobe

• Published in: IEEE transactions on antennas and propagation Vol. 67; no. 9; pp. 5934 - 5942
• Main Authors: Shen, Rong, Ye, Xiuzhu, Xie, Jinhua, Chen, Zhijiao, Jin, Cheng
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.09.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna arrays; Antenna feeds; Aperture antennas; Apertures; Array antenna; Beams (radiation); Circularity; Corporate profiles; Electric power distribution; Horn antennas; low-sidelobe; millimeter wave; Quadrants; Reflection coefficient; Sidelobe reduction; Sidelobes; sum–difference network
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2019.2920358

A circular aperture box-horn array antenna operating in W-band, with sum and difference radiation beams, is presented in this paper. The circular aperture provides maximum usage efficiency of the area, which is well suited for a rotational platform. Nonuniform power distribution is applied for the radiating elements, contributing to a radiation pattern with suppressed sidelobe. In order to fit into the circular aperture, the feed networks are optimally arranged on a compact two-planar layer with four quadrants fed by the sum-difference network. The antenna array, along with its full-corporate feed networks, has a low profile and is easy to be machined. Measured results show that the peak gain is over 35.6 dBi from 92 to 94 GHz, with up to −21 dBi sidelobe level. In addition, the sum-difference contradictions are less than 4 dB, and the nulls of difference beams are below −25 dB.