Split-Ring Resonator Antennas for Wireless Communication Applications
Date Issued
2013
Date
2013
Author(s)
Chen, Jiun-Peng
Abstract
Split-ring resonators (SRRs) are proposed for miniaturized slot antenna, wireless sensor networks (WSNs) application, circularly polarized antenna, and tag antenna of radio frequency identification (RFID). From the perspective of the history and structure introduce the SRRs in Chapter 2. Chapter 3 addresses a slot dipole antenna fed by a coplanar waveguide (CPW) with SRRs. When resonators are placed at different positions of the slot with all other parameters unchanged, the resonant frequency can be changed. The resonant frequency of the slot can be lowered significantly when SRRs are placed close to the central feeding CPW line. By the similar concept introduced in Chapter 3, a slot antenna using capacitive load realized by SRRs is proposed as the node antenna in Chapter 4. The slot antenna fed by a microstrip line is proposed as an easy method to conjugate match to the chips using lumped elements. In Chapter 5 and Chapter 6, a spirally complementary split-ring resonators (CSRRs) antenna with circular polarization (CP) and a compact strip dipole coupled SRR antenna are proposed for RFID reader and tag applications, respectively. In reader applications, the size of circular antenna is compact, which is very suitable for the ultra-high frequency (UHF) handheld RFID reader system. In tag applications, the tag antenna has a simple and uniplanar structure to conjugate match to the chip by detail design process. The input impedance of tag antenna is measured by thru-reflect-line (TRL) calibration technique and probe technique. The radiation patterns are measured and compared to the minimum power transmitted by the reader. Good agreement between simulation and experiment is obtained.
Subjects
裂環共振器
天線
射頻辨識
無線感測
Type
thesis
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