volume | PIER Journals

2018-07-14

First-Order Minkowski Fractal Circularly Polarized Slot Loop Antenna with Simple Feeding Network for UHF RFID Reader

Xiuhui Yang,

Dr. Xiuhui Yang

Institute of Microelectronics

Southwest Jiaotong University

China

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Quanyuan Feng,

Prof. Quanyuan Feng

School of Information Science and Technology

Southwest Jiaotong University

China

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Zongliang Zheng

Dr. Zongliang Zheng

School of Information Science and Technology

Southwest Jiaotong University

China

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Progress In Electromagnetics Research Letters, Vol. 77, 89-96, 2018

doi:10.2528/PIERL18052501

Abstract

A circularly polarized (CP) antenna with simple feeding network for ultra-high-frequency (UHF) radio-frequency identification (RFID) reader application is presented in this letter. The proposed antenna consists of a slot loop etched on the ground and a simple feeding network using bended microstrip lines. And the two parts of the antenna are printed on either sides of a thin substrate, thus a low-profile antenna is obtained. The slot loop is meandered based on the first-order Minkowski fractal technique for antenna size reduction. To generate circularly polarized radiation, two branches of the feeding network are designed to be orthorhombic with 90° phase difference. The antenna is simulated and practically fabricated with a compact size of 80×80×1.6 mm³. The 10-dB impedance bandwidth and 3-dB axial-ratio (AR) bandwidth are measured to be 50 MHz (0.896-0.946 GHz) and 12 MHz (0.916-0.928 GHz), respectively. The measured peak gain exhibits stable value of 3 dBi over the impedance bandwidth. Furthermore, a wide 3-dB beamwidth of 120° is achieved for the proposed antenna. Based on the above, this antenna is well suited for applications in UHF RFID handheld readers.

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Xiuhui Yang, Quanyuan Feng, and Zongliang Zheng, "First-Order Minkowski Fractal Circularly Polarized Slot Loop Antenna with Simple Feeding Network for UHF RFID Reader," Progress In Electromagnetics Research Letters, Vol. 77, 89-96, 2018.
doi:10.2528/PIERL18052501

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