Realization of High-Gain Low-Sidelobe Wide-Sector Beam Using Inductive Diaphragms Loaded Slotted Ridge Waveguide Antenna Array for Air Detection Applications

This article presents a high-gain slotted ridge waveguide antenna array (SRWAA) with inductive diaphragms, which can realize a wide-sector beam with a low sidelobe simultaneously. The proposed antenna can cover a wide detection range and avoid interference from other directions. The expected excitat...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2022-04, Vol.70 (4), p.2698-2707
Main Authors: Chen, Jianzhong, Hu, Tian, Zhao, Yu-Tong, Li, Liang, Bao, Min, Su, Tao, Ding, Jinshan
Format: Article
Language:English
Subjects:
Air detection
Antenna arrays
Beamforming
Diaphragms
Dispersion
dispersion suppression
Equivalent circuits
High gain
Imaging radar
inductive diaphragm
Meteorological radar
Power dividers
Radar antennas
Radar imaging
Sidelobe reduction
Sidelobes
Signal quality
Slot antennas
slotted ridge waveguide antenna array (SRWAA)
Spaceborne radar
Transmission line matrix methods
Unmanned aerial vehicles
Waveguide antennas
wide-sector beam
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Summary:This article presents a high-gain slotted ridge waveguide antenna array (SRWAA) with inductive diaphragms, which can realize a wide-sector beam with a low sidelobe simultaneously. The proposed antenna can cover a wide detection range and avoid interference from other directions. The expected excitation distribution for the antenna array is extracted through a beamforming method. To reduce the influence of the dispersion phenomenon on signal quality, inductive diaphragms are inserted into the sidewall of the ridge waveguide, which is fully analyzed from the point of the equivalent circuit. A cut-off-mode power divider is utilized, which can control the power ratio flexibly. An SRWAA working at 24.125 GHz, including a six-way feeding network, and a 6\times24 slot array with the size of 330 mm \times66.8 mm is designed and fabricated. The measured sidelobe level (SLL) and half-power beamwidth (HPBW) in the elevation plane are −19.6 dB and 54.41°, with the counterparts in the azimuth plane −29.8 dB and 3.15°, respectively. The measured peak gain is 22.3 dBi at 24.125 GHz. The measured results are in good agreement with the simulated ones. This work has the potential to be applied in air detection, anti-unmanned aerial vehicles (UAVs), meteorological radar, and imaging radar.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2021.3118780