DocumentCode :
43759
Title :
Dual-Band Low-Profile Crossed Asymmetric Dipole Antenna on Dual-Band AMC Surface
Author :
Son Xuat Ta ; Ikmo Park
Author_Institution :
Dept. of Electr. & Comput. Eng., Ajou Univ., Suwon, South Korea
Volume :
13
fYear :
2014
fDate :
2014
Firstpage :
587
Lastpage :
590
Abstract :
A dual-band, low-profile, circularly polarized antenna on an artificial magnetic conductor (AMC) is introduced in this letter. The antenna employs a single feed and two crossed asymmetric dipoles as the primary radiating elements. In order to achieve a low profile and broadband characteristics in terms of impedance matching and 3-dB axial-ratio (AR) bandwidths at both bands, a dual-band AMC is utilized as a reflector of the antenna. The AMC structure utilizes four T-shaped slits in a unit-cell patch to significantly reduce its first and second resonant frequency ratio, and consequently its first and second resonances are easily adjusted for the desired operating frequencies. For performance verification, an antenna prototype was fabricated with an overall 2.4-GHz frequency size of 0.576λ0 × 0.576λ0 × 0.088λ0 (72 × 72 × 11 mm3). The measurements resulted in impedance bandwidths of 2.20-2.60 and 4.90-5.50 GHz for 10 dB and 3-dB AR bandwidths of 2.30-2.50 and 5.05-5.35 GHz. Additionally, the antenna yields right-hand circular polarization and high antenna efficiency at both bands.
Keywords :
UHF antennas; antenna radiation patterns; conductors (electric); dipole antennas; multifrequency antennas; polarisation; artificial magnetic conductor; circularly polarized antenna; dual-band AMC surface; dual-band low-profile crossed asymmetric dipole antenna; frequency 2.4 GHz; high antenna efficiency; impedance matching; primary radiating elements; right-hand circular polarization; single feed asymmetric dipoles; two crossed asymmetric dipoles; unit-cell patch; Antenna measurements; Antenna radiation patterns; Bandwidth; Dipole antennas; Dual band; Surface impedance; Artificial magnetic conductor; T-shaped slit; asymmetric dipole; circular polarization; dual-band operation; second resonance;
fLanguage :
English
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
Publisher :
ieee
ISSN :
1536-1225
Type :
jour
DOI :
10.1109/LAWP.2014.2312950
Filename :
6776416
Link To Document :
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