Microwave antenna

Details Microwave antenna Microwave antenna

1989-12-29

1991-04-02

Hille, Rolf

Communications: radio wave antennas

Antennas

With spaced or external radio wave refractor

343785, 343911R, H01Q019060, H01Q013000

Patent

active

050050222

ABSTRACT:
An antenna includes a sheet of dielectric material having two parallel surfaces. A tapered recess in one surface converges towards the other surface with the axis of the recess orthogonal to said surface. The dielectric material has a critical angle of reflection with respect to the axis. A RF horn is located in proximity to the surface with the recess and has an axis in common with the axis of the tapered recess. A RF lens is located between the horn and the tapered recess. The optical properties of the RF horn, RF lens, tapered recess, and dielectric material are such that all rays traced from the horn through the lens and dielectric material to the second surface have an angle with respect to said normal of the second surface greater than said critical angle. RF energy on the second surface from the center of the horn is in phase with RF energy on said second surface from the edge of said horn allowing a surface wave to be launched on the second surface. Perturbing means cause such a surface wave to leak to produce a radiating aperture with a desired illumination characteristic.

REFERENCES:
patent: 4536767 (1985-08-01), Rembold et al.

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