Title :
A three layer circularly polarized resonant cavity antenna
Author :
Vaid, Swati ; Mittal, Ashok
Author_Institution :
Ambedkar Inst. of Adv. Comm. Tech. & Res., New Delhi, India
Abstract :
This paper presents the design of a three layer wideband circularly polarized resonant cavity antenna. Dual circularly polarized (CP) aperture coupled microstrip antenna is used as the primary source embedded inside the cavity formed by metallic ground plane and frequency selective surface (FSS) based superstrate. The superstrate is placed at a distance of half a wavelength from ground. The dual (LHCP/RHCP) circularly polarized radiation is achieved by feeding the aperture coupled microstrip patch with branch-line coupler. Approximately 22% (2.2 Ghz-2.77Ghz) impedance bandwidth and axial ratio bandwidth (less than 3.7dB) is obtained. The maximum directivity of the antenna is 8dBi. The directivity can be further enhanced by increasing the lateral size of the antenna.
Keywords :
UHF antennas; antenna feeds; antenna radiation patterns; broadband antennas; frequency selective surfaces; microstrip antennas; multifrequency antennas; substrate integrated waveguides; waveguide couplers; aperture coupled microstrip patch; axial ratio bandwidth; branch-line coupler; dual circularly polarized aperture coupled microstrip antenna; frequency 2.2 GHz to 2.77 GHz; frequency selective surface based substrate; impedance bandwidth; maximum antenna directivity; metallic ground plane; three layer wideband circularly polarized resonant cavity antenna; Apertures; Bandwidth; Cavity resonators; Frequency selective surfaces; Microstrip antennas; Aperture coupled antennas; circular polarization; frequency selective surfaces;
Conference_Titel :
Microwave and RF Conference (IMaRC), 2014 IEEE International
Conference_Location :
Bangalore
DOI :
10.1109/IMaRC.2014.7038966
