Electrically-and-magnetically-coupled, batteryless, portable, fr

Details Electrically-and-magnetically-coupled, batteryless, portable, fr Electrically-and-magnetically-coupled, batteryless, portable, fr

1992-03-18

1993-08-31

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

3072191, 363157, 363159, G08B 1324

Patent

active

052412989

ABSTRACT:
A batteryless, portable, frequency divider includes a first resonant circuit that is resonant at a first frequency for receiving electromagnetic radiation at the first frequency; and a second resonant circuit that is resonant at a second frequency that is one-half the first frequency for transmitting electromagnetic radiation at the second frequency; and a circuit element electrically connecting the first resonant circuit to the second resonant circuit. The first resonant circuit is coupled magnetically to the second resonant circuit to transfer energy to the second resonant circuit at the first frequency in response to receipt by the first resonant circuit of electromagnetic radiation at the first frequency; and at least one of the first resonant circuit, the second resonant circuit and the circuit element includes an active element, such as a variable reactance element or a semiconductor switching device having gain, for causing the second resonant circuit to transmit electromagnetic radiation at the second frequency in response to the energy transferred from the first resonant circuit at the first frequency.

REFERENCES:
patent: 3906245 (1975-09-01), Shen
patent: 4314373 (1982-02-01), Sellers
patent: 4481428 (1984-11-01), Charlot
patent: 4670740 (1987-06-01), Herman et al.
patent: 5065137 (1991-11-01), Herman
patent: 5065138 (1991-11-01), Lian et al.

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