Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1985-05-06
1989-02-14
Sikes, William L.
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
343909, 343911R, 264 23, 264334, H01Q 1508, H01Q 1906
Patent
active
048049700
ABSTRACT:
A dielectric antenna lens for planar wavefront/focal point conversion is configured of a series of concentric rings, each of which is contoured from a rear face to inclined termination edges that are delimited by the functional performance of the lens and which assist in the manufacture of the lens. In addition, the bottom edge of each ring, rather than terminate at a cylindrical side wall of an adjacent ring, terminates at a flattened region between itself and the adjacent ring. This flattened region effectively eliminates the acute angle wedge between rings and, together with the inclined termination edges of the rings, serves to enable the lens to be easily manufactured, as by injection molding, with the flattened land portions and inclined termination edges making possible removal of the lens from the injection mold.
As a further aspect of the present invention there is provided a multiple wavelength conversion arrangement employing the dielectric lens in combination with a wavelength selective (e.g. dichroic) filter, enabling the lens to be used as part of a compact microwave transceiver unit operating at a plurality of different frequencies.
REFERENCES:
patent: 2547416 (1951-04-01), Skellett
patent: 3698001 (1972-10-01), Koyama et al.
patent: 3886561 (1975-05-01), Beyer
patent: 4170616 (1979-10-01), Jebens
patent: 4443088 (1984-04-01), Ohtaka
patent: 4456344 (1984-06-01), Bordignon
Harris Corp.
Sikes William L.
Wimer Michael C.
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