Dual-band Circularly Polarized Shared-aperture Antenna

Abstract

A novel dualband circularly polarized shared-aperture antenna is proposed in the paper. The antenna is designed to operate at two distinct frequency bands of P band and L/S band. The antenna is composed of a circularly polarized magneto-electric dipole antenna and 16 microstrip antenna arrays. The magneto-electric dipole imposes four same metallic radiators and two feeding probes. A microstrip antenna array consists of four square probe-fed microstrip antennas and ten parasitic square patches. The antenna operates over a frequency range of 223 MHz to 445 MHz and 1.97 GHz to 2.27 GHz for VSWR < 2, meanwhile, the axial ratio is less than 1.7 dB and 0.3 dB in Z direction covering the lower band and higher band, respectively.