Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1978-10-26
1980-09-23
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
340673, 340686, G01S 302
Patent
active
042246245
ABSTRACT:
Electromagnetic radiation position detection system and method are disclosed for detecting when a movable object is located at a predetermined position. In a preferred embodiment, polarized microwave radiation emitted from a source fixed relative to the movable object is rotated when the object is in an aligned position and a detector fixed with respect to the movable object and located opposite the fixed source provides a signal when substantially only the rotated, polarized radiation is detected. In one particular embodiment, a plurality of conveyor pans which are part of a car parking tower is the movable object and each pan carries a waveguide which rotates the microwave radiation propagated therethrough. The conveyor pan also has a wheel well with a switch located therein and which, when depressed by the tire of a properly located car on the conveyor pan acts to block the radiation from being detected.
REFERENCES:
patent: 2578046 (1951-12-01), Cooper et al.
patent: 2773609 (1956-12-01), Holappa
patent: 2874822 (1959-02-01), Coursey
patent: 3323617 (1967-06-01), Inuzuka et al.
patent: 3656608 (1972-04-01), Lichti
patent: 3877002 (1975-04-01), Cheal et al.
patent: 4087746 (1978-05-01), Kanae
Blum Theodore M.
Park Mobile, Inc.
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