Circular Polarization Annular Leaky-Wave Antenna with Conical and Broadside Beams

In order to properly cover different scenarios, radiation patterns of antennas should be accordingly designed. However, most are unable provide either broadside beams or designable conical beams, which the typically used for radio coverage, based on one single-structure format through adjusting parameters before fabrication. this paper, a planar circular polarized (CP) annular leaky-wave antenna (LWA) is proposed, realized an substrate-integrated waveguide (SIW). A beam could easily obtained fabricating LWA with structural parameters. The operating frequency 5.75 GHz. allows only −1st spatial harmonic radiate, while fundamental wave and other harmonics suppressed in slow mode. validate design effectiveness, two examples fabricated measured. measurement results show good agreement simulation results. shows gain 9.75 dBic angle 13° has 7.93 dBic. proposed presents promising performance candidate wireless communication applications.