Title :
A low-profile two-arm Archimedean spiral antenna radiating a circularly polarized normal beam or conical beam
Author :
Bin Wen ; Ze-Hong Yan ; Ke Chen ; Yan Shi
Author_Institution :
Nat. Key Lab. of Antenna & Microwave Technol., Xidian Univ., Xi´an, China
Abstract :
A two-arm Archimedean spiral antenna (TAS) is proposed to provide a circularly polarized (CP) normal beam or conical beam. The antenna is fed by coaxial lines without a balun circuit. When it is excited out of phase, a CPnormal beam which is almost symmetric with respect to the antenna axis is produced. While excited in phase, it radiates a CP conical beam. The antenna height is chosen to be extremely small to realize a low-profile antenna. The simulated results show that the antenna has a good VSWR and a good axial ratio over the frequency range of 1.8GHz to 2.1GHz.
Keywords :
UHF antennas; antenna radiation patterns; spiral antennas; CP conical beam; CP normal beam; circular polarization; coaxial lines; frequency 1.8 GHz to 2.1 GHz; low-profile; low-profile two-arm Archimedean spiral antenna; Cavity resonators; Dielectric substrates; Materials; Reflector antennas; Spirals; Wideband; Circularly polarized; conical beam; low-profile antenna; normal beam; spiral antenna;
Conference_Titel :
Microwave and Millimeter Wave Circuits and System Technology (MMWCST), 2013 International Workshop on
Conference_Location :
Chengdu
DOI :
10.1109/MMWCST.2013.6814565
