Abstract
In this paper, a 94 GHz dual-polarization high-isolation cassegrain antenna feed by a diagonal horn antenna is designed. The antenna consists of a D = 540 mm main reflector, sub-reflector, and dual-port dual-polarization diagonal horn feed antenna. To obtain similar feed horn E-H radiation patterns, gain, high polarization, and port isolation, a dual-port diagonal horn was designed in the feed. The measured antenna gains are 50.85 dBi and the side-lobe levels are −24.5 dB at E-H radiation patterns of two ports at 94 GHz, respectively. The VSWRs of port 1 and port 2 are less than 1.5:1 in the range 93.2–95.3 GHz, which meets the working requirements of frequency modulated continuous wave and pulse cloud radars. And the isolation between the two ports is above −50 dB, whereas the polarization isolation of each port is above 40 dB. The proposed W-band antenna is a suitable candidate for the dual-polarization cloud radars.
Highlights
C URRENTLY, 94 GHz millimeter wave (MMW) weather radars have been developed in recent years because of their excellent ability to investigate the interior structures of clouds and detect the size distributions of cloud particles [1], [2]
A diagonal horn feed antenna is fed with two ports perpendicular to each other for good polarization isolation performance
The test results demonstrate that the VSWRs of port 1 and 2 are well matched in the range 93.2–95.3 GHz, and the isolation between two ports is better than 50 dB in the range 93.2–95.3 GHz
Summary
C URRENTLY, 94 GHz millimeter wave (MMW) weather radars have been developed in recent years because of their excellent ability to investigate the interior structures of clouds and detect the size distributions of cloud particles [1], [2]. Because dual polarization and high isolation characteristics play an important role in the inversion analysis of meteorological targets, the design of dual polarization, high port and polarization isolation, lower side lobes, and high gain antenna becomes significant and important for performance of MMW radars [3]. As shown, in order to obtain better detection and identification ability of meteorological particles, considering systematic error, the polarization isolation of weather radar antenna should be better than -30 dB [4]. In [6], a novel highisolation 35/94-GHz dual-frequency orthogonal cassegrain antenna was designed and analyzed. A three-dimensional (3D) printed cassegrain antenna for THz near-field focusing
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