A BROADBAND CIRCULARLY POLARIZED ANTENNA FED BY HORIZONTAL L-SHAPED STRIP.

A new design of broadband circularly polarized antenna is proposed. The antenna is composed of a square patch and a horizontal L-shaped stripline that feeds the patch at two orthogonal directions by two probes. The L-shaped feeding structure provides excitements of approximately equal amplitude and 90° phase difference and then good circularly polarized characteristics are obtained. Measured results show that the proposed antenna has 10-dB impedance bandwidth of 14.3% (2.27-2.62 GHz) and 3-dB axial-ratio bandwidth of 13.1% (2.3 -2.62 GHz). Moreover, the measured gain is over 7 dBic within the effective band. [ABSTRACT FROM AUTHOR]