Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1982-05-14
1985-11-05
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
343 68R, G08B 1324
Patent
active
045517126
ABSTRACT:
In an electronic detection system comprising a transmitter for generating an interrogation field, said transmitter being coupled with at least one transmitting antenna coil; a responder with a receiving coil and a transmitting coil for transmitting a signal in response to said interrogation field; and a receiver-and-detector coupled with at least one receiving antenna coil for receiving and further processing the signal transmitted by said responder; the improvement which consists in that said receiving coil and said transmitting coil of said responder are arranged in parallel to each other, and that said responder comprises a frequency divider connected between said receiving and transmitting coil and arranged to divide the signal frequency received by a factor N.gtoreq.4.
REFERENCES:
patent: 3838409 (1974-09-01), Minasy et al.
patent: 3859652 (1975-01-01), Hall et al.
patent: 3895368 (1975-07-01), Gordon et al.
patent: 3964024 (1976-06-01), Hutton et al.
patent: 4260983 (1981-04-01), Falck et al.
patent: 4274089 (1981-06-01), Giles
Dutch Search Report, Oct. 29, 1982 (Form PCT/ISA/201(a)07.1979).
N.V. Nederlandsche Apparatenfabriek Nedap
Swann III Glen R.
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