Title :
A circularly polarized short backfire antenna excited by an unbalance-fed cross aperture
Author :
Li, RongLin ; Thompson, Dane C. ; Papapolymerou, John ; Laskar, Joy ; Tentzeris, Manos M.
Author_Institution :
Georgia Electron. Design Center, Georgia Inst. of Technol., Atlanta, GA
fDate :
3/1/2006 12:00:00 AM
Abstract :
An unbalance-fed cross aperture is developed to excite a short backfire antenna (SBA) for circular polarization. The cross aperture consists of two orthogonal H-shaped slots with a pair of capacitive stubs and is fed by a single probe that forms an unbalanced feed with a shorting pin. It is demonstrated that the cross-aperture-excited SBA can achieve an axial ratio (les 3 dB) bandwidth of 4.2% with a voltage standing wave ratio (VSWR) bandwidth of 6.5% (VSWR<1.2) and a gain of 14 dBi. The antenna structure is described and the simulation and experimental results are presented. The mechanisms for impedance matching and circular-polarization production are analyzed
Keywords :
antenna feeds; aperture antennas; electromagnetic wave polarisation; impedance matching; slot antennas; SBA; VSWR; axial ratio bandwidth; capacitive stub; circular polarization; impedance matching; orthogonal H-shaped slot; short backfire antenna; unbalance-fed cross aperture; voltage standing wave ratio; Aperture antennas; Bandwidth; Feeds; Impedance matching; Microstrip; Polarization; Probes; Satellite antennas; Slot antennas; Voltage; Circularly polarized antenna; short backfire antenna (SBA); slot-fed antenna;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2006.869910
