Title :
Dual-Band Circularly Polarized Antenna Combining Slot and Microstrip Modes for GPS With HIS Ground Plane
Author :
Yuan-Ming Cai ; Ke Li ; Ying-Zeng Yin ; Xueshi Ren
Author_Institution :
Sci. & Technol. on Antennas & Microwave Lab., Xidian Univ., Xi´an, China
Abstract :
A dual-band circularly polarized antenna for GPS L1 and L2 bands is proposed and investigated in this letter. The dual-band design is realized based on the strategy of combining the microstrip mode and annular slot mode. The proposed antenna consists of an annular slot radiator printed on a square substrate and a high impedance surface (HIS) ground plane. The HIS, working as ground plane for microstrip mode and reflector for slot mode radiation, is settled under the square substrate to realize unidirectional radiation with low profile. Experimental results show that the proposed antenna exhibits two overlapped impedance and axial ratio bandwidth of 40 MHz (1.210-1.250 GHz) and 50 MHz (1.555-1.605 GHz) and the measured gains are about 8.0 dBic and 7.5 dBic, respectively. Very low backward radiation can also be observed in both operating bands.
Keywords :
Global Positioning System; UHF antennas; antenna radiation patterns; electromagnetic wave polarisation; loop antennas; microstrip antennas; multifrequency antennas; reflector antennas; slot antennas; GPS; HIS ground plane; L1 band; L2 band; annular slot antenna radiation mode; bandwidth 40 MHz; bandwidth 50 MHz; dual-band circularly polarized antenna; frequency 1.210 GHz to 1.250 GHz; frequency 1.555 GHz to 1.605 GHz; high impedance surface ground plane; microstrip antenna mode; reflector; square substrate; unidirectional radiation; very low backward radiation; Antenna measurements; Dual band; Global Positioning System; Microstrip; Microstrip antennas; Slot antennas; Annular slot; backward radiation; circular polarization; high impedance surface (HIS); microstrip mode;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2015.2395538
