Title :
A wider band microstrip antenna for circular polarization
Author :
Bhattacharyya, Arun K. ; Shafai, Lotfollah
Author_Institution :
Dept. of Electr. Eng., Manitoba Univ., Winnipeg, Man., Canada
fDate :
2/1/1988 12:00:00 AM
Abstract :
Circular polarization is achieved by separating two degenerate orthogonal modes in an annular ring patch antenna, by using an ear at the outer periphery. The analysis of such a structure is performed by using the generalized transmission line model. It is found theoretically that this structure can be used to generate circular polarization over a wider frequency range than other structures. An annular ring is designed and its performance is evaluated. Good agreement between the theory and the experiment is obtained. It is also found that the axial ratio bandwidth is higher for the TM12 mode than the TM32 mode of operation in an annular ring antenna
Keywords :
antenna theory; electromagnetic wave polarisation; microstrip antennas; transmission line theory; annular ring patch antenna; axial ratio bandwidth; circular polarization; generalized transmission line model; outer periphery; wider band microstrip antenna; Antenna radiation patterns; Bandwidth; Ear; Feeds; Impedance; Microstrip antennas; Patch antennas; Performance analysis; Polarization; Resonant frequency;
Journal_Title :
Antennas and Propagation, IEEE Transactions on