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Electrically small square loop antenna with a capacitive split ring resonator cover structure
Author(s) -
Kim YongJin,
Lee HongMin
Publication year - 2009
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.24137
Subject(s) - loop antenna , ground plane , antenna tuner , antenna measurement , electrical engineering , antenna (radio) , antenna factor , dipole antenna , capacitive sensing , impedance matching , acoustics , engineering , physics , optoelectronics , electrical impedance
In this article, electrically small square loop antenna with a capacitive split ring resonator (SRR) cover structure is built and tested. The size of the proposed antenna (ka = 0.34) is smaller than the corresponding Chu limiting value and it is efficiently matched without additional matching network. An electrically small loop antenna has a large inductive reactance. Therefore, a capacitive SRR can be used to achieve impedance matching of the antenna. The equivalent circuit model of the antenna structure is applied to analyze and qualify the design correctness. The experimental result shows that the resonant frequency and impedance bandwidth (VSWR ≤ 2) are 906 MHz and 5.8 MHz (901.7–907.5 MHz), respectively. The proposed antenna has a radiation efficiency of 42.85% and maximum gain of −0.59 dBi at 906 MHz and it is fabricated on a Teflon substrate (ε r = 2.2) without using a ground plane. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 831–835, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24137