This paper discusses the design and optimization of a circularly polarized printed patch for an S-Band on board LEOsatellite Transmitter. Circular polarization is achieved with single point feed by a so called perturbation segment, in this case a pair of truncated corners. First an analysis based on the cavity model approach for the single CP patch is carried out, which is used to determine the normalized perturbation parameter. The initial dimensions are calculated using perturbation analysis. Optimization is performed using full wave analysis tools based on Method of Moments (MoM), and Finite Difference Time domain (FDTD). The measured minimum axial ratio is 0.3 dB for the truncated-corner square-patch antenna operating at 2.25 GHz. Peak antenna gain across the overall operating band is measured to be 6.6 dBi. Finally, the measured input impedance and radiation patterns are correlated with the calculated results. |
Abstracts 
