Abstract
A K -band multibeam lens antenna is reported for hydrological radar applications. It is designed with a shared aperture and drifted feeds on elevation and azimuth. The feeds shift off the focal point of the lens onto a planar plane, which generates multibeam by refraction, meanwhile easing the mounting of the lens on a smooth surface. A conical horn array is designed as the feed for increased gain and better power capacity. Both dielectric and metallic three-dimensional printing technologies are adopted for fabrication. Measurement results agree with simulation, showing an impedance bandwidth of 18–25 GHz. The boresight gain lies in the range of 24–29 dBi. It radiates seven beams ±34° symmetrically on elevation and azimuth. Mutual coupling between adjacent ports is below −30 dB. The proposed multibeam lens enriches the choices for hydrological radar applications, in which a large area or multiple targets shall be looked upon from distance away.
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