Arrangement for a passive responder for a position finding syste

Details Arrangement for a passive responder for a position finding syste Arrangement for a passive responder for a position finding syste

1974-05-09

1976-02-24

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

246122R, 343 65SS, 343 18B, G01S 956, B61L 2500

Patent

active

039407659

ABSTRACT:
This invention relates in general to a passive responder of a position finding system including at least one microwave antenna and a resonator body. The resonator body is mounted adjacent the rail of a railroad track and is connected to a microwave antenna which points upwardly such that it receives radiation from a transmitter carried by the train. The radiation opening of the receiving antenna is adjacent the rail head and the antenna is covered with a cover member comprising dielectric material which comes into contact with the wheel as each wheel rolls past. The contact of the wheel with the dielectric cover assures that ice, snow, and other foreign material will be continuously cleared from the receiving antenna so as to assure optimum operation of the transponder.

REFERENCES:
patent: 3210539 (1965-10-01), Malaquin
patent: 3247509 (1966-04-01), Hamann et al.
patent: 3406391 (1968-10-01), LeVon, Jr.
patent: 3886548 (1975-05-01), Majeau et al.

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