Loaded waveguide lenses

Details Loaded waveguide lenses Loaded waveguide lenses

1981-05-27

1984-08-21

Lieberman, Eli

Communications: radio wave antennas

Antennas

With spaced or external radio wave refractor

343909, H01Q 1506

Patent

active

044673299

ABSTRACT:
Waveguide lenses characterized by wide bandwidth, polarization-insensitivity, and absence of physical zoning steps. A waveguide lens constructed in accordance with the variable cut-off frequency approach of the invention comprises a two-dimensional array of individual waveguide elements arranged in proximate juxtaposition extending between inner and outer lens surface contours. At least a portion of the outer surface contour follows a constant group delay surface contour, and the individual waveguide elements are configured so as to have cut-off frequencies individually selected so as to compensate the phase lengths of individual waveguide elements to provide constant phase delay. For determining the various cut-off frequencies and thus phase lengths, the individual waveguide elements may have various cross-sectional configurations, various fillings of dielectric material, or both. Preferably, the portion of the outer surface contour following a constant group delay surface contour includes an annular region in the vicinity of 0.6 times lens radius for typical illuminationtaperings and the radially-central region follows a constant phase delay surface contour. A waveguide lens in accordance with the filter-type approach of the invention comprises a two-dimensional array of individual waveguide elements arranged in proximate juxtaposition extending between inner and outer lens surfaces. Filter structures are provided in selected individual waveguide elements, with the parameters of the individual filter structures selected so as to achieve both minimum group delay distortion and minimum phase delay distortion.

REFERENCES:
patent: 2833909 (1974-09-01), Schaufelberger
patent: 2834962 (1958-05-01), Proctor
patent: 4044360 (1977-08-01), Wolfson et al.
patent: 4194209 (1980-03-01), Coulbourn, Jr.
patent: 4321604 (1982-03-01), Ajioka

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