A Phase Center-Stabilized K/Ka/V-Band Linearly Polarized Horn for Luneburg Lenses

Abstract

Phase center stabilization and fabrication methods for a K/Ka/V-band dual-ridged horn antenna are discussed. The antenna operates from 18 to 45 GHz and has good impedance match and compact aperture suitable for assembling into feed manifolds for Luneburg lenses. The phase center is stabilized by using sin2 ridge profile. Geometrically identical horns are fabricated by means of additive direct metal laser sintering (DMLS) three-dimensional metal printing and traditional computer numerical control split block machining. No significant difference in performance is found in spite of apparent surface roughness on the DMLS antenna.