Title :
A conical quadrifilar helix antenna for GNSS applications
Author :
Baiquan Ning ; Juan Lei ; Yongchao Cao ; Liang Dong
Author_Institution :
Nat. Key Lab. of Antenna & Microwave Technol., Xidian Univ., Xi´an, China
Abstract :
A broadband conical quadrifilar helix antenna is presented in this paper. The broadband characteristic is achieved by tapering the helices, utilizing conical geometry and adjusting the dimensions of the cone-shape support. The bandwidth, defined for a VSWR<;2, is about 25% across 1155-1327MHz and 1447-1617MHz, covering all of the frequencies of Global Navigation Satellite System including GPS, GLONASS, Galileo and Compass. The antenna is fed by a wideband four-output-ports feed network with equal magnitude and consistent 90° phase shift. The final antenna obtains excellent circular polarisation, a good gain (greater than 4.5dB at boresight) and good axial-ratio performance over a wide angular range for Global Navigation Satellite System applications.
Keywords :
UHF antennas; antenna radiation patterns; broadband antennas; broadband networks; conical antennas; electromagnetic wave polarisation; helical antennas; satellite navigation; Compass; GLONASS; GNSS applications; GPS; Galileo; Global Navigation Satellite System; broadband conical quadrifilar helix antenna; circular polarisation; conical geometry; frequency 1155 MHz to 1327 MHz; frequency 1447 MHz to 1617 MHz; wideband four-output-ports feed network; Broadband antennas; Broadband communication; Feeds; Frequency measurement; Global Positioning System; Helical antennas; Conical Quadrifilar Helix Antenna; Global Navigation Satellite System (GNSS); wideband feed network;
Conference_Titel :
Antennas & Propagation (ISAP), 2013 Proceedings of the International Symposium on
Conference_Location :
Nanjing
Print_ISBN :
978-7-5641-4279-7
