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2024-03-20
Compact Dual-Polarized Antenna with Wide Band and High Isolation Using Characteristic Mode Analysis
By
Progress In Electromagnetics Research C, Vol. 142, 95-106, 2024
Abstract
In this paper, a compact dual-polarized antenna with wide band and high isolation is proposed, which can be applied to the 5G WiFi frequency band. The antenna is composed of 2 × 2 arrayed patches and two orthogonal L-shaped probe structures with reduced middle patch width and loaded U-shaped slots. The proposed antenna achieves a compact size by eliminating the need for a complex feeding network, instead utilizing only two closely spaced L-shaped probes for feeding. The antenna's radiation modes excited by two ports are orthogonal in polarization direction, and each port can excite two linearly polarized radiation modes respectively within the operating frequency band, thereby achieving dual-linear polarization and wideband performance. The antenna is analyzed and designed using characteristic mode analysis (CMA). By reducing the patch middle width and loading U-shaped slots on the L-shaped probe of the antenna, the suppression of high-order modes, improvement of isolation, and reduction of cross-polarization levels are achieved. The size of the antenna is 0.54λ0 × 0.54λ0 × 0.068λ00 is the free-space wavelength of central frequency). The measured bandwidth is 23.5% (4.73 GHz-5.99 GHz) with |S11| < -10 dB, |S21| < -27.9 dB, boresight gain of 4.8 dBi-6.2 dBi and cross-polarization levels better than -23 dB.
Citation
Zhongjie Zhan, Wen Huang, Rui Deng, and Bao Li, "Compact Dual-Polarized Antenna with Wide Band and High Isolation Using Characteristic Mode Analysis," Progress In Electromagnetics Research C, Vol. 142, 95-106, 2024.
doi:10.2528/PIERC24013101
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