This paper presents the design of a 5 m aperture three-reflector offset-fed Cassegrain antenna. A set of rotating fast-scanning mirrors installed at the feed aperture enables one-dimensional rapid scanning observation from geostationary orbit. To meet launch vehicle envelope constraints, the 5 m primary reflector employs a segmented construction, and the secondary reflector utilizes a folded-optics design based on its virtual focus. The antenna’s radiation performance was simulated and tested, demonstrating a total main beam efficiency better than 90% and a radiation pattern uncertainty between semi-physical simulation and measurement of better than 1%.
References
[1]
Qian, B., Cao, A.J., Wu, Y., et al. (2017) A Review on Geostationary Earth Orbit Microwave Atmospheric Sounding Technology. Remote Sensing for Land and Resources, 29, 1-5.
[2]
Lu, N.M. and Gu, S.Y. (2016) The Status and Prospects of Atmospheric Microwave Sounding by Geostationary Meteorological Satellite. Advances in Met S&T, 6, 120-123.
[3]
Chen, K., Zheng, Z.M., et al. (2021) Performance of Geostationary Orbit Millimeter-Wave Atmospheric Soundings Based on End to End Simulations. Journal of Infrared and Millimeter Waves, 40, 1001-9014.
[4]
Xie, Z.C., Xu, H.X., An, D.W., et al. (2018) Remote Sensing Technology of Experimental Microwave Radiometer in Geostationary Orbit. Aerospace Shanghai, 35, 49-58.
[5]
Yu, X.J., Li, J.Y. and Zhang, X.G. (2019) Beam Scanning Characteristics of Side-Feed Offset Cassegrain Antenna. Chinese of Radio Science, 34, 628-632.
[6]
Ulaby, F.T., Moore, R.K. and Fung, A.K. (1988) Microwave Remote Sensing. Beijing Science Press, 13-37.
[7]
Chen, X., Qu, J., Yu, C., et al. (2012) The Shaped Millimeter-Wave Antenna with Offset Feed and Dual-Reflector. Journal of Infrared and Millimeter Waves, 31, 42-46.
