Differentially-Fed Slot Array Antenna Backed With High-Order Resonating Cavity Loading Slow-Wave Top-Bottom Double Pins

A novel slot array antenna based on a rectangular waveguide (RWG) cavity using the high-order resonating mode is introduced in this article. A TE440-mode radiation cavity is used to excite 4\times4 radiation slot elements with a specific distribution that ensures in-phase fields. To achieve a wide...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2024-04, Vol.72 (4), p.3081-3091
Main Authors: Zhao, Xiaofei, Fan, Fangfang, Yan, Zehong, Sun, Dongquan, Wei, Bing, Wang, Enlin, Wang, Zelong, Zhu, Honghuan, Li, Yanfeng
Format: Article
Language:English
Subjects:
Antenna arrays
Antenna measurements
Antennas
Array antenna
backed cavity
Bandwidths
Cavity resonators
Couplings
differential feeding
Directivity
high-order mode
Impedance matching
Metals
pin
Pins
Radiation
Rectangular waveguides
Resonant frequency
slot antenna
Slot antennas
slow wave
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Summary:A novel slot array antenna based on a rectangular waveguide (RWG) cavity using the high-order resonating mode is introduced in this article. A TE440-mode radiation cavity is used to excite 4\times4 radiation slot elements with a specific distribution that ensures in-phase fields. To achieve a wide 1-dB gain bandwidth, slow-wave top-bottom double pins (TBDPs) are positioned near the radiation slots within the radiation cavity. This helps to simultaneously improve directivity, impedance matching, and eliminate grating lobes. A differential feeding strategy is deployed, employing the TE120-mode feeding cavity to excite both coupling slots with identical amplitude and 180° phase difference. The measurement and simulation results of the proposed cavity-backed slot antenna are in good agreement. The measured results reveal notable achievements, including an impedance bandwidth ( \vert S_{11}\vert < -10 dB) of 9% (14.2-15.54 GHz) and a 1-dB gain bandwidth of 8.05% (14.3-15.5 GHz). Furthermore, the measured peak realized gain is 18.87 dBi and the maximum realized aperture efficiency is 86.2%.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2024.3363468