Communications: radio wave antennas – Antennas – High frequency type loops
Patent
1987-11-24
1989-02-21
Sikes, William L.
Communications: radio wave antennas
Antennas
High frequency type loops
343717, 343866, 343867, H01Q 1112
Patent
active
048069434
ABSTRACT:
In a fixed station for a two-way radio link with a vehicle (5) which has a self-contained transmit/receive device (6) including a transmit antenna (8) in the form of a vertical axis coil so as to generate a vertical electromagnetic field and a receive antenna (9) in the form of a horizontal axis coil disposed transversely relative to the vehicle, a set of transmit/receive antennas at the fixed station includes a receive antenna constituted by a first multiconductor cable (10) forming a rectangular loop whose long dimension runs parallel to the direction of vehicle displacement, and a transmit antenna constituted by a second multiconductor cable (12) forming two narrow elongate rectangular loops extending in the direction of vehicle displacement and mutually parallel so as to create a horizontal electromagnetic field extending perpendicularly to the direction of vehicle displacement. The first and second cables are placed in slots (11) formed in the roadway where the vehicle passes, and subsequently closed by suitable material (18). The ends (13, 14, 15, and 16) of the two cables are brought together to the side of the roadway (1) in a junction box (17) for enabling various connections to be performed, the junction box also receiving two screened cables, one of which serves to feed the transmit antenna, and the other of which serves to receive current picked up by the receive antenna.
REFERENCES:
patent: 1612427 (1926-12-01), Flurscheim
patent: 2157532 (1939-05-01), Foster
patent: 2597518 (1952-05-01), Parks
patent: 3182314 (1965-05-01), Kleist
patent: 3694751 (1972-09-01), Takahashi
patent: 3742150 (1973-06-01), Sherman et al.
patent: 4239415 (1980-12-01), Blikken
Companie Generale d'Automatisme
Le Hoang-anh
Sikes William L.
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