Discussion of the Transmission Efficiency of Quasi-optical Reflector Antenna Across Various Levels of Feeder Performance

Authors

  • Haoran Zhang College of Information Science and Technology Beijing University of Chemical Technology, 100191 Beijing, China
  • Ming Jin College of Information Science and Technology Beijing University of Chemical Technology, 100191 Beijing, China https://orcid.org/0000-0002-1977-8029

DOI:

https://doi.org/10.13052/2025.ACES.J.400207

Keywords:

Brightness temperature leakage, microwave radiometer calibration, quasi-optical reflector antenna

Abstract

For microwave radiometer calibration, higher main beam efficiency reduces interference from environmental brightness temperature (BT). A key challenge for high-frequency microwave sounders is achieving high main beam efficiency with limited mirror size. Although efficiency has improved to around 95-98%, there is still room for improvement. This study investigates the main beam efficiency of ground-based radiometer antenna systems, considering feeders with different radiating qualities and mirror conditions. A quasi-ellipsoidal mirror with feeders operating at multiple discrete frequencies is designed to optimize the optical path for microwave calibration. The key focus is transmission efficiency, which affects BT leakage. Numerical results for various feeders are compared - straight wall corrugated horns with 98.2% Gaussian content, dual-mode horns with 98.5%, curved wall corrugated horns with 99.8%, and ideal Gaussian beams - highlighting achievable transmission levels in different polarizations with different feeders. Design curves for the high main beam efficiency quasi-optical reflector antenna system are provided. Such information is beneficial and of direct referencing value for practical radiometer reflector antenna designs.

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Author Biographies

Haoran Zhang, College of Information Science and Technology Beijing University of Chemical Technology, 100191 Beijing, China

Haoran Zhang received the B.Sc. degree from Beijing University of Chemical Technology (BUCT) in 2023, where he is now pursuing his master’s degree. His research interest is the design of quasi-optical antennas.

Ming Jin, College of Information Science and Technology Beijing University of Chemical Technology, 100191 Beijing, China

Ming Jin received the B.Sc. and Ph.D. degrees from Beihang University (BUAA), Beijing, China, in 2007 and 2013, respectively. From 2007 to 2012, he was a research assistant in the Microwave Engineering Laboratory, Beihang University. From December 2010 to March 2011, he was a Visiting Scholar at Arizona State University. In 2019, he joined the College of Information Science and Technology, Beijing University of Chemical Technology (BUCT) as an associate professor. His research interests include microwave radiometer calibration techniques, quasi-optical beam propagation and computational electromagnetics.

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FEKO. Altair Engineering, Inc., Troy, MI, 2020.

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Published

2025-02-28

How to Cite

[1]
H. . Zhang and M. . Jin, “Discussion of the Transmission Efficiency of Quasi-optical Reflector Antenna Across Various Levels of Feeder Performance”, ACES Journal, vol. 40, no. 02, pp. 138–147, Feb. 2025.