A Single-Cavity X/Ku/Ka/W Quad-Band Feed Horn With 10-to-1 Spaced Bands for Satellite Communications

Abstract

This paper presents the design and performance analysis of a quad-band feed horn operating in the X, Ku, Ka, and W frequency bands, primarily targeting intersatellite communication and weather radar applications. The proposed feed horn employs a single-cavity structure with four standard rectangular feeding ports. To effectively improve isolation between closely spaced frequency bands, orthogonal feeding structures and low-pass filters are utilized. A prototype model of the antenna was fabricated and measured to validate the design’s effectiveness. Experimental results demonstrate that the designed feed achieves gains of 9.8, 12, 18.5, and 25.1 dBi at the operating frequencies of 9.4, 14.5, 35, and 94 GHz, respectively. Additionally, the voltage standing wave ratio (VSWR) is less than 1.4:1 at bandwidths greater than 1 GHz. These results indicate that the proposed feed horn is a promising candidate for future multifunctional radars and intersatellite communications.