Transmitting and receiving system

Details Transmitting and receiving system Transmitting and receiving system

1996-10-25

1999-01-26

Horabik, Michael

Communications: electrical

Continuously variable indicating

With meter reading

34282535, 342572, 342573, 342568, 342 44, 342 51, G01S 1300

Patent

active

058643028

ABSTRACT:
A transmitting and receiving system including, a transponder always maintains a transmission function even if circuit constants of circuit elements are deviated or such circuit constants are shifted in association with temperature changes. The transponder includes a transponder coil electromagnetically coupled to an antenna coil through which a response signal is transmitted, a resonance capacitor, a main modulation circuit including a first modulation capacitor, and a supplemental modulation circuit including a second modulation capacitor whose static capacitance value is different from that of the first modulation capacitor. A response signal is transmitted in changing an impedance of a transmitting and receiving portion by the main modulation circuit when a question signal is received and by the supplemental modulation circuit when a correction command signal is received.

REFERENCES:
patent: 4755871 (1988-07-01), Morales-Garza et al.
patent: 5305008 (1994-04-01), Turner et al.

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