Title :
Dual-Frequency Dual-Sense Circularly-Polarized Slot Antenna Fed by Microstrip Line
Author :
Bao, Xiulong ; Ammann, M.J.
Author_Institution :
Dublin Inst. of Technol., Dublin
fDate :
3/1/2008 12:00:00 AM
Abstract :
A new design of a dual-frequency dual circularly-polarized slot antenna is presented. The dual-frequency is achieved using a single-layer microstrip-fed configuration coupled to a modified annular-slot antenna. The dual sense circular-polarization is obtained by four unequal linear slots which augment the annular slot. Experimental results show the proposed antenna has good circular polarization characteristics for both right-hand circular polarization (RHCP) and left-hand circular polarization (LHCP). The 10 dB return loss impedance bandwidths for the lower (RHCP) and higher (LHCP) bands are 26.7% and 11.3%, respectively. The 3 dB axial-ratio bandwidths are 6.1% and 6.0% with respect to 1.5 GHz (RHCP) and 2.6 GHz (LHCP), respectively.
Keywords :
UHF antennas; antenna feeds; microstrip antennas; multifrequency antennas; polarisation; slot antennas; annular slot; annular-slot antenna; dual sense circular-polarization; dual-frequency dual-sense circularly-polarized slot antenna fed; frequency 1.5 GHz; frequency 2.6 GHz; left-hand circular polarization; linear slots; loss 10 dB; right-hand circular polarization; single-layer microstrip-fed configuration; Antenna feeds; Arm; Bandwidth; Broadband antennas; Frequency; Geometry; Impedance; Microstrip antennas; Polarization; Slot antennas; Dual circularly polarization; dual frequency; right-hand circular polarization (RHCP)/left-hand circular polarization (LHCP); slot antennas;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2008.916961
