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A Balanced Feed Filtering Antenna With Novel Coupling Structure for Low-Sidelobe Radar Applications

Wen, Le-Hu, Gao, Steven, Luo, Qi, Tang, Zhaoyang, Hu, Wei, Yin, Yingzeng, Geng, Youlin, Cheng, Zhiqun (2018) A Balanced Feed Filtering Antenna With Novel Coupling Structure for Low-Sidelobe Radar Applications. IEEE Access, 6 . pp. 77169-77178. ISSN 2169-3536. (doi:10.1109/ACCESS.2018.2878793) (KAR id:72760)

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A fourth-order filtering patch antenna with a novel coupling structure is presented in this paper. Using the proposed coupling structure, both the balanced coupling feed and cross-coupling are realized. Two identical slots etched on the ground plane are utilized to excite the radiating patch with the reduced cross-polarization level. A short slot etched on the ground plane is employed for cross-coupling, which introduces two controllable radiation nulls with a steep roll-off rate. In addition, owing to the split-ring resonators and hairpin resonators, the improved impedance bandwidth is achieved with the fourth-order filtering response. To demonstrate the proposed design techniques, both the filtering antenna element and the low-sidelobe array are designed, fabricated, and measured. The measured results show that the proposed antenna has the impedance bandwidth of 12% (4.78–5.39 GHz) with the total height of 0.06?0 , the cross-polarization level lower than ?31 dB, and two radiation nulls with the suppression higher than 31 dB. For the low-sidelobe antenna array, wide impedance bandwidth is also obtained with the sidelobe level below ?28.7 dB, the cross-polarization level below ?34 dB, and the out-of-band suppression better than 25 dB.

Item Type: Article
DOI/Identification number: 10.1109/ACCESS.2018.2878793
Uncontrolled keywords: Filtering antenna, low cross-polarization, low-sidelobe
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: Steven Gao
Date Deposited: 26 Feb 2019 10:24 UTC
Last Modified: 16 Feb 2021 14:03 UTC
Resource URI: (The current URI for this page, for reference purposes)
Gao, Steven:
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