Voltage-controlled variable-passband filter and high-frequency c

Details Voltage-controlled variable-passband filter and high-frequency c Voltage-controlled variable-passband filter and high-frequency c

1997-11-06

2000-01-25

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333235, 333246, H01P 1203

Patent

active

060182822

ABSTRACT:
The voltage-controlled variable-passband filter in accordance with the present invention is structured so that conductive patterns, R, L, and C, and other circuit elements are embedded in a ceramic substrate. Within this substrate is also embedded an insulating layer made of the same ceramic material, the capacitance of which changes in response to an electric field applied thereto. On one surface of the insulating layer is provided a control electrode, and on the other surface are provided adjacent to one another a resonator pattern, to which high-frequency signals are applied, and a ground pattern. Accordingly, two capacitors connected in series are formed between the resonator pattern and the ground pattern, and the capacitance of these series capacitors can be adjusted by an integrated circuit mounted on the ceramic substrate, thus reducing size and weight, and simplifying adjustment.

REFERENCES:
patent: 3569795 (1971-03-01), Gikow
patent: 4835499 (1989-05-01), Pickett
patent: 5166646 (1992-11-01), Avanic et al.
patent: 5334958 (1994-08-01), Babbitt
patent: 5496795 (1996-03-01), Das
patent: 5627502 (1997-05-01), Ervasti
patent: 5640042 (1997-06-01), Koscica et al.

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