Non-imaging glideslope antenna systems

Details Non-imaging glideslope antenna systems Non-imaging glideslope antenna systems

1994-06-02

1996-08-13

Wimer, Michael C.

Communications: radio wave antennas

Antennas

Measuring signal energy

343816, 343817, 343890, 343853, 342373, H01Q 330, H01Q 2110

Patent

active

055460950

ABSTRACT:
A non-imaging antenna system for the Instrument Landing System (ILS) utilizes a spatial filter network to provide a glideslope beam at a positive angle, while providing a null effect at a corresponding negative angle to reduce energy reflection at the glideslope angle. Four radiating elements, each including dipoles and a corner reflector, can be used as two overlapping vertical arrays of three elements each. A magic-T input junction is used to provide sum and difference glideslope beam signals to the overlapping arrays. The radiated signals of the two overlapping arrays provide aircraft guidance signals enabling an approaching aircraft to derive indications of high or low departures from the desired glide path. The array apertures may also be tilted from vertical to avoid coning effects of prior ILS antennas. Guidance signals compatible with the current ILS are provided, while avoiding site limitations, snow cover and other operating deficiencies of prior ILS antennas.

REFERENCES:
patent: 3124802 (1964-03-01), Dall'armi
patent: 3903524 (1975-09-01), Giannini
patent: 3964067 (1976-06-01), Lucas
patent: 4342997 (1982-08-01), Evans
patent: 4823144 (1989-04-01), Guy

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