Design of 2.45GHz Circularly Polarized Tag Antenna

Q3 Engineering

Journal of Communications Pub Date : 2023-10-01 DOI:10.12720/jcm.18.10.608-612

Chung-Long Pan, Shuming T. Wang, Ping-Cheng Chen, Yen-Fu Chen

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引用次数: 0

Abstract

This paper presents the design and development of a circularly polarized (CP) tag antenna to overcome the polarization mismatch between the reader antenna and the tag antenna in RFID systems. This CP antenna is designed at 2.4 GHz for radio frequency identification (RFID) applications. It consists of a simple square loop loaded with an open gap, two feeding strips, and a matching stub. The antenna is fabricated on an FR4 substrate with a dielectric constant of 4.4, a dielectric loss tangent of 0.02, and a thickness of 0.8mm. In order to achieve conjugate matching between the circular tag antenna and the tag chip, the technique of loading a matching short line on the tag chip was used. Additionally, the radiation of circular polarization (CP) was achieved by placing an open gap and two feeding strips on the square loop. Through electromagnetic simulation analysis, the antenna performance is evaluated. The reflection coefficient (S11) at 2.45 GHz is measured to be - 17.16db, indicating good impedance matching. The 3 dB axial ratio bandwidth is 0.19 GHz (7.7%), covering the frequency range of 2.34 GHz to 2.53 GHz. The 10db power reflection bandwidth is approximately 8.9% (2.33 GHz to 2.55 GHz), ensuring broad operational bandwidth. The antenna also exhibits a favorable antenna gain of 2.29dBi. This study successfully demonstrates the design and performance evaluation of a CP tag antenna for RFID applications

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2.45GHz圆极化标签天线设计

为解决RFID系统中读写器天线与标签天线极化不匹配的问题，设计并研制了圆极化标签天线。该CP天线设计为2.4 GHz，用于射频识别(RFID)应用。它由一个简单的方形环，一个开放的间隙，两个进料条，和一个匹配的存根。该天线制作在介电常数为4.4，介电损耗正切为0.02，厚度为0.8mm的FR4衬底上。为了实现圆形标签天线与标签芯片之间的共轭匹配，采用了在标签芯片上加载匹配短线的技术。此外，圆极化(CP)的辐射是通过在方形环路上放置一个开放的间隙和两个馈电条来实现的。通过电磁仿真分析，对天线的性能进行了评价。测量到2.45 GHz时的反射系数(S11)为- 17.16db，阻抗匹配良好。3db轴比带宽为0.19 GHz(7.7%)，频率范围为2.34 GHz ~ 2.53 GHz。10db功率反射带宽约为8.9% (2.33 GHz ~ 2.55 GHz)，保证了较宽的工作带宽。该天线还具有2.29dBi的良好天线增益。本研究成功展示了用于RFID应用的CP标签天线的设计和性能评估

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Communications Engineering-Electrical and Electronic Engineering

CiteScore

3.40

自引率

0.00%

发文量

期刊介绍： JCM is a scholarly peer-reviewed international scientific journal published monthly, focusing on theories, systems, methods, algorithms and applications in communications. It provide a high profile, leading edge forum for academic researchers, industrial professionals, engineers, consultants, managers, educators and policy makers working in the field to contribute and disseminate innovative new work on communications. All papers will be blind reviewed and accepted papers will be published monthly which is available online (open access) and in printed version.