Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1988-10-14
1990-03-27
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342412, 350951, G01S 116, B64F 120
Patent
active
049124803
ABSTRACT:
An azimuthal scanning antenna for an aircraft landing system is formed of a set of vertically disposed columnar radiators arranged side-by-side in a horizontal array. The columnar radiators are tilted back in pitch 7.5.degree.. Individual ones of the radiators are formed of waveguide sections terminated by reflecting end walls. The terminating walls provide for a standing wave of electromagnetic field in response to microwave electromagnetic energy applied to the waveguide section by a feed disposed at or near the bottom of the waveguide section. Slot apertures are disposed along a front wall of each waveguide section, and are oriented at a selected angle relative to a perpendicular relationship to the sidewalls. The orientation of the slots introduces a variation in coupling for illumination of the radiation aperture of the radiator wherein the phase center is offset from a central point towards an upper end of each of the waveguide sections. The sighting of the feed and a phase shifter associated therewith to a point below the top of the waveguide section and the raising of the phase center enables the antenna to increase the height of the source point from which the beam appears to radiate. This provides better clearance of nearby objects, particularly a tower which supports an approach light, without intrusion toward an aircraft glide path. Another important characteristic is the antenna's frequency insensitivity, which provides performance over all MLS frequency channels without requiring mechanical adjustment of the antenna pitch angle.
REFERENCES:
patent: 3328800 (1967-06-01), Algeo
patent: 4371876 (1983-02-01), Nash
patent: 4811022 (1989-03-01), Cafarelli et al.
Hazeltine Corporation
Issing Gregory C.
Onders E. A.
Tarcza Thomas H.
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