A High-Gain Controllable Radiation Nulls SIGW Filtering Antenna With Improved Selectivity for 5G Millimeter-Wave Applications

In this letter, a substrate integrated gap waveguide (SIGW) filtering antenna with controllable radiation nulls, high-gain, and improved selectivity for millimeter-wave applications is proposed. A novel coupling feeding network (CFN) topology using multiple paths based on SIGW is presented to obtain...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2024-12, Vol.23 (12), p.4328-4332
Main Authors: Wang, Lihui, Wang, Wenjian, Luo, Zhiyong, Lin, Qiu-Hua, Hou, Da, Chen, Pengpeng, Chen, Hao
Format: Article
Language:English
Subjects:
Antenna measurements
Antennas
Bandpass filters
Controllability
Controllable radiation nulls
Couplings
Cutoff frequency
Electric fields
Equivalent circuits
Filtering
frequency cutoff
Gain
High gain
improved selectivity
Millimeter waves
millimeter-wave (MMW) filtering antenna
substrate integrated gap waveguide (SIGW)
Surface waves
Topology
Waveguides
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Summary:In this letter, a substrate integrated gap waveguide (SIGW) filtering antenna with controllable radiation nulls, high-gain, and improved selectivity for millimeter-wave applications is proposed. A novel coupling feeding network (CFN) topology using multiple paths based on SIGW is presented to obtain a bandpass filtering response with a center frequency of 31 GHz, which is verified by an equivalent circuit model. The sideband rolloff characteristics of this antenna can be independently tuned by the SIGW and CFN to achieve radiation nulls. Furthermore, the selectivity and gain of the antenna are improved, benefiting from SIGW's frequency cutoff property and suppression of edge electric fields, respectively. The filtering antenna is fabricated, assembled, and measured. The measured results show a suppression level of 19.6 dB, a bandwidth of 14.2%(|S_{11}|< -{\text{10}} dB), and a peak realized gain of 9.6 dBi.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2024.3445433