Title :
Dual-band omnidirectional circularly polarized antenna utilizing epsilon negative transmission line
Author :
Byung-Chul Park ; Jeong-Hae Lee
Author_Institution :
Dept. of Electron. & Electr. Eng., Hongik Univ., Seoul, South Korea
Abstract :
In this paper, a dual-band omnidirectional circularly polarized (CP) antenna is presented using 0 and +1 modes of epsilon negative (ENG) transmission line (TL). The antenna is based on the circular mushroom structure with curved branches. The CP antenna is a planar type and simply designed without 90 degree phase shifter and dual feeding structure. The measured average axial ratios at 0 and +1 mode in the azimuthal plane are 2.03 dB and 3.88 dB, respectively. The measured average left-hand (LH) CP gain and right-hand (RH) CP gain are -0.40 dBic at 0 mode and -0.66 dBic at +1 mode, respectively, in the azimuthal plane and these results show a good agreement with simulated data.
Keywords :
antenna feeds; antenna radiation patterns; metamaterial antennas; multifrequency antennas; planar antennas; polarisation; transmission lines; ENG; axial ratio; circular mushroom structure; curved branches; dual band omnidirectional circularly polarized antenna; dual feeding structure; epsilon negative transmission line; left-hand CP gain; phase shifter; planar type; right-hand CP gain; Antenna measurements; Antenna radiation patterns; Dual band; Gain; Transmission line antennas; Dual-band CP antennas; epsilon negative transmission line; metamaterials; omnidirectional CP antennas;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2012 Asia-Pacific
Conference_Location :
Kaohsiung
Print_ISBN :
978-1-4577-1330-9
Electronic_ISBN :
978-1-4577-1331-6
DOI :
10.1109/APMC.2012.6421505
