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10.3390/s25072211
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Article

A 60-GHz Wideband High-Efficiency Circularly Polarized Dual-Coil Antenna Array

by
Jun Xiao
1,
Qi Gan
1,
Zihang Ye
1,
Chong-Zhi Han
1,
Tongyu Ding
1,* and
Qiubo Ye
2,*
1
School of Ocean Information Engineering, Jimei University, Xiamen 361021, China
2
College of Information Science and Engineering, Hohai University, Changzhou 213200, China
*
Authors to whom correspondence should be addressed.
Sensors 2025, 25(7), 2211; https://doi.org/10.3390/s25072211
Submission received: 25 February 2025 / Revised: 25 March 2025 / Accepted: 28 March 2025 / Published: 31 March 2025
(This article belongs to the Special Issue Design and Measurement of Millimeter-Wave Antennas)
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Abstract

A wideband high-efficiency circularly polarized (CP) dual-coil antenna array is presented for 60-GHz applications in this letter. The proposed CP dual-coil antenna is composed of a resonant substrate-integrated cavity (SIC) and a pair of centrally symmetrical coils, which are fed differentially by a substrate-integrated waveguide (SIW) coupling slot. A novel sequential rotation feeding technique is introduced to enhance the axial ratio (AR) and impedance bandwidths of both the 2 × 2 subarray and the 4 × 4 array. The proposed feeding network significantly improves radiation efficiency. The measured results of the fabricated prototype indicate that the proposed array achieves an impedance bandwidth of 20.8% (54.6–67.3 GHz) for |S11| ≤ −10 dB, a 3-dB AR bandwidth of 21.5% (54–67 GHz), a high radiation efficiency of 96.6%, and a peak gain reaching 19.3 dBic at 58 GHz. The proposed circularly polarized (CP) antenna element and array design stand out as strong contenders for 60-GHz wireless applications.
Keywords: high efficiency; circularly polarized (CP); self-sequential rotation technique; antenna array; 60-GHz high efficiency; circularly polarized (CP); self-sequential rotation technique; antenna array; 60-GHz

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MDPI and ACS Style

Xiao, J.; Gan, Q.; Ye, Z.; Han, C.-Z.; Ding, T.; Ye, Q. A 60-GHz Wideband High-Efficiency Circularly Polarized Dual-Coil Antenna Array. Sensors 2025, 25, 2211. https://doi.org/10.3390/s25072211

AMA Style

Xiao J, Gan Q, Ye Z, Han C-Z, Ding T, Ye Q. A 60-GHz Wideband High-Efficiency Circularly Polarized Dual-Coil Antenna Array. Sensors. 2025; 25(7):2211. https://doi.org/10.3390/s25072211

Chicago/Turabian Style

Xiao, Jun, Qi Gan, Zihang Ye, Chong-Zhi Han, Tongyu Ding, and Qiubo Ye. 2025. "A 60-GHz Wideband High-Efficiency Circularly Polarized Dual-Coil Antenna Array" Sensors 25, no. 7: 2211. https://doi.org/10.3390/s25072211

APA Style

Xiao, J., Gan, Q., Ye, Z., Han, C.-Z., Ding, T., & Ye, Q. (2025). A 60-GHz Wideband High-Efficiency Circularly Polarized Dual-Coil Antenna Array. Sensors, 25(7), 2211. https://doi.org/10.3390/s25072211

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