Tunable ultra-high frequency filter with variable capacitance tu

Details Tunable ultra-high frequency filter with variable capacitance tu Tunable ultra-high frequency filter with variable capacitance tu

1981-02-25

1983-04-19

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333209, 333253, H01P 1207, H01P 100

Patent

active

043807470

ABSTRACT:
The invention relates to ultra-high frequency filters with variable capacitance tuning devices tunable in a wide frequency range.
Each tuning device comprises two coaxial fingers, namely a fixed finger and a finger movable in the filter body. One of these fingers is hollow and the other has a tuning plunger, whose end is cylindrical and which is displaceable, e.g. by screwing in the body of the finger. The minimum capacitance obtained with a minimum penetration of the plunger, its end being level in the vicinity of the end of the corresponding finger, is adjustable by displacing the movable finger relative to the fixed finger. The supplementary variable capacitance is obtained by plunging the tuning plunger into the hollow finger.

REFERENCES:
patent: 2085223 (1937-06-01), Kolster
patent: 2645679 (1953-07-01), Reade
patent: 3273083 (1966-09-01), Rose
patent: 3336542 (1967-08-01), Hancock
patent: 3444485 (1969-05-01), Okean
patent: 3480889 (1969-11-01), Kach
patent: 3618135 (1971-11-01), Weller
patent: 3733567 (1973-05-01), Johnson
patent: 3737816 (1973-06-01), Honicke
patent: 4001737 (1977-01-01), Scott

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