Title :
Dual-Band Circularly Polarized Patch Antenna With First Positive and Negative Modes
Author :
Seung-Tae Ko ; Byung-Chul Park ; Jeong-Hae Lee
Author_Institution :
Dept. of Electron. Inf. & Commun. Eng., Hongik Univ., Seoul, South Korea
Abstract :
A dual-band circularly polarized (CP) patch antenna having a first positive ( +1) mode and negative ( -1) mode is proposed in this letter. The +1 mode is a half-wavelength mode in the right-handed (RH) region, and the -1 mode is induced by a composite right/left-handed (CRLH) transmission line (TL) in the left-handed (LH) region. In order to realize CP properties, a trimmed square patch antenna and a 2 × 2 triangle mushroom antenna are employed, respectively, and the two antennas are combined to obtain small size. The proposed antenna has a single feed and a single-layered substrate even though it contains two antennas. Measurements show that the antenna has CP bandwidths of 2.879-2.901 GHz at the low band and 3.822-3.829 GHz at the high band. Finally, peak gains of 6.26 and 6.97 dBic are obtained and radiation efficiencies of 82% and 65% are measured at each band, respectively.
Keywords :
antenna feeds; metamaterials; microstrip antennas; multifrequency antennas; polarisation; bandwidth 2.879 GHz to 2.901 GHz; bandwidth 3.822 GHz to 3.829 GHz; composite right left handed transmission line; dual band circularly polarized patch antenna; efficiency 65 percent; efficiency 82 percent; first negative mode; first positive mode; half wavelength mode; left handed region; right handed region; single feed antenna; single layered substrate; triangle mushroom antenna; trimmed square patch antenna; Antenna measurements; Antenna radiation patterns; Dual band; Gain; Microstrip antennas; Patch antennas; Composite right/left-handed (CRLH); dual-band circular polarization; first negative mode;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2013.2281320
