Design of a High-Isolation 35/94-GHz Dual-Frequency Orthogonal-Polarization Cassegrain Antenna

In this letter, a novel high-isolation 35/94-GHz dual-frequency orthogonal Cassegrain antenna is designed. The antenna consists of a D = 800 mm main reflector, a subreflector, and a dual-band orthogonal-polarization feed. In order to get similar feed horn's E-H radiation patterns and similar ph...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2017, Vol.16, p.1297-1300
Main Authors: Wang, Jie, xiang Ge, Jun, Zhou, Yong, Xia, Han, zhi Yang, Xian
Format: Article
Language:English
Subjects:
Antenna feeds
Antenna measurements
Antenna radiation patterns
Antennas
Cassegrain antenna
dual-frequency
high isolation
Low-pass filters
orthogonal polarization
Polarization
Radar antennas
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Summary:In this letter, a novel high-isolation 35/94-GHz dual-frequency orthogonal Cassegrain antenna is designed. The antenna consists of a D = 800 mm main reflector, a subreflector, and a dual-band orthogonal-polarization feed. In order to get similar feed horn's E-H radiation patterns and similar phase center positions at the dual frequencies separately, the dual-mode conical horn is designed in the feed. For obtaining a high isolation, a three-order low-pass filter is designed in the Ka-band waveguide feed port. The measured antenna gains are 43.6 and 51.3 dBi, and the sidelobe levels are -27.5 and -26.5 dB at 35 and 94 GHz, respectively. The isolation between the two ports is -61.0 dB in the Ka-band and -63.5 dB in the W-band. The proposed antenna is a suitable candidate for a dual-band radar system.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2016.2633284