Tag responsive to high-frequecy for varying capacitance of tunin

Details Tag responsive to high-frequecy for varying capacitance of tunin Tag responsive to high-frequecy for varying capacitance of tunin

1995-05-25

1998-06-30

Horabik, Michael

Communications: electrical

Continuously variable indicating

With meter reading

34082549, 34082535, 340505, 340572, 363125, 363126, G08B 1300, H04Q 100

Patent

active

057740623

ABSTRACT:
A memory stores optimum capacitance values of a variable capacitor obtained by measuring in advance depending on temperatures. In practical use, a controller reads an optimum capacitance value from the memory according to a temperature obtained by a temperature sensor, and sets a capacitance value of the variable capacitor to the optimum capacitance value. Thus, a tuning frequency can be always adjusted to the frequency of a radio wave transmitted. Also, deviation of the tuning frequency due to variations in the production process can be remedied by varying the capacitance value according to data stored in the memory.

REFERENCES:
patent: 4924211 (1990-05-01), Davies
patent: 5266925 (1993-11-01), Vercellotti
patent: 5446447 (1995-08-01), Carney et al.
patent: 5448220 (1995-09-01), Levy
patent: 5451941 (1995-09-01), Lamazou et al.
patent: 5457447 (1995-10-01), Ghaem et al.
patent: 5499017 (1996-03-01), Beigel
patent: 5528232 (1996-06-01), Verma et al.

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