Study on A New Broadband Conical Corrugations Shaped as Archimedes Spiral Horn Antenna

A novel broadband near-constant beamwidth conical corrugated horn antenna with radial slots shaped as Archimedes spiral is proposed. The new corrugated horn antenna has a quite competitive combination of performance figures for both the Ku- and K-bands. The -10 dB beamwidth of radiation pattern over the entire band is near-constant varied among 50°-70°. The maximum difference of -10 dB beamwidth in the three main planes (E, H, and D) from 12GHz to 28GHz is less than 5°, which demonstrates the outstanding axial symmetry of radiation patterns. In addition, the gain of the antenna can reach among 14.5-17.5 dBi and the variation of the phase center is less than 1.2λ(f min ) over the operating bandwidth. This novel structure corrugated horn antenna possesses a small size. The length of the horn antenna is just 2 λ(f min ).