A compact substrate integrated waveguide circularly polarized horn antenna

In this paper, we present a novel substrate integrated waveguide (SIW) circularly polarized (CP) horn antenna. The CP horn antenna is implemented on a single-layer substrate with a thickness of 0.12λ
₀
at the center frequency (1.524mm). It comprises a phase control and power divider structure, two waveguide antennas and an antipodal linearly-tapered slot antenna (ALTSA). The simulated results of the proposed horn antenna exhibit an 4.6% bandwidth (23.6GHz-24.7GHz) where the axial ratio is below 3dB and VSWR is below 2. The gain of the antenna is around 9dB over the operating frequency range.