A Low-Profile Broadband Circularly Polarized Slot Antenna Loaded With Metasurface for UHF-RFID Readers

被引：1
作者：
Doan, Thi Ngoc Hien [1 ]
Le, Hai Dang [1 ]
Hoang, Van Son [1 ]
Nguyen, Khac Kiem [1 ]
Ta, Son Xuat [1 ]
机构：
[1] Hanoi Univ Sci & Technol, Sch Elect & Elect Engn, Hanoi 100000, Vietnam
来源：
IEEE ACCESS | 2025年 / 13卷
关键词：
Broadband antennas; Metasurfaces; Radiofrequency identification; Antenna measurements; Slot antennas; Antennas; Antenna arrays; Antenna radiation patterns; Gain; Broadband communication; RFID; reader; broadband; circular polarization; metasurface; antenna; ARRAY;
D O I：
10.1109/ACCESS.2025.3574117
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
A low-profile broadband antenna with high-gain circularly polarized (CP) radiation is proposed for ultra-high frequency (UHF) radio frequency identification (RFID) readers. The design is a sequentially rotated 2 x 2 CP slot array. Each slot element utilizes two 45 degrees-rotated stubs to introduce proper structural asymmetry, and consequently, achieve CP radiation. The array is fed by a sequential-phase feeding network for improving CP radiation in terms of gain and 3-dB axial ratio (AR) bandwidth. For a broadside radiation, the slot array is backed by a ground plane (GND). A metasurface, which is composed of 6x6 periodic metallic plates, is inserted between the array and GND to allow a low profile with high efficiency. The final design with overall size of 210x210x32.4 mm(3) ( 0.6 lambda x 0.6 lambda x 0.09 lambda at 0.86 GHz) has been fabricated and measured. The measurements result in a 10-dB return-loss bandwidth of 0.81-0.96 GHz, a 3-dB AR bandwidth of 0.86-0.93 GHz, and broadside right-hand CP radiation with the peak gain of 8.7 dBic.
引用
收藏
页码：93057 / 93062
页数：6
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