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Millimeter‐wave wideband circularly polarized monopulse antenna using the sequential rotation feeding technique
Author(s) -
Hu Jun,
Hao ZhangCheng,
Miao ZhuoWei,
Yuan Quan
Publication year - 2019
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21489
Subject(s) - monopulse radar , optics , wideband , axial ratio , bandwidth (computing) , physics , extremely high frequency , beam waveguide antenna , antenna (radio) , coaxial antenna , microstrip antenna , electrical engineering , microstrip , engineering , telecommunications , circular polarization , radar , radar imaging , continuous wave radar
This article presents the design and implementation of a single‐layer wideband millimeter‐wave circularly polarized (CP) monopulse cavity‐backed antenna based on substrate integrated waveguide (SIW) technology. The antenna consists of a 2 × 8 array of CP cavity‐backed antenna elements, a 90° 3‐dB coupler, power dividers, and phase shifters. In order to enhance the operating bandwidths, the sequential rotation feeding technology is adopted in the design of the monopulse antenna. To validate the proposed concept, a prototype operating at 42 GHz was fabricated and measured. The measured 3‐dB axial ratio (AR) bandwidth for the sum beam can cover a frequency range from 37 to 46 GHz. The measured gain for the sum beam at the center frequency of 42 GHz is 17.5 dBiC, while the null‐depth of the difference beam is measured to be −36.8 dB. The proposed monopulse antenna has advantages of low‐cost, easy‐fabrication, and easy integration with planar circuits.