Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1988-03-11
1989-12-19
LaRoche, Eugene R.
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
333172, 333184, 333185, 333205, 361392, H03H 712
Patent
active
048885681
ABSTRACT:
An LC filter includes a dielectric base plate having throughholes, and pluralities of first and second inductance conductors are formed on the both main surfaces of the dielectric base plate, respectively. The respective first and second inductance conductors are paired by being electrically connected through the througholes and, thereby a plurality of inductors are formed. A capacitor is formed by first and second capacitance electrodes which are formed on both main surfaces of the dielectric base plate at positions opposing each other. The plurality of inductors and the capacitor are suitably connected. First and second additional electrodes are formed on both main surfaces of dielectric base plate at positions opposing each other so that a capacitor for trimming is formed by the additional electrodes. The capacitor for trimming is connected in parallel with at least one of the plurality of inductors. By trimming the first and/or the second additional electrodes, a capacitance value of the capacitor for trimming is changed, whereby a resonant frequency, determined by the inductor to which the capacitor for trimming is connected, can be adjusted.
REFERENCES:
patent: 2001282 (1935-05-01), Nyman
patent: 2751558 (1956-06-01), Grieg et al.
patent: 3947934 (1976-04-01), Olson
patent: 4063201 (1977-12-01), Komatsubara et al.
patent: 4287602 (1981-09-01), Kessler
patent: 4754242 (1988-06-01), Okamura et al.
Ham Seung
LaRoche Eugene R.
Murata Manufacturing Co. Ltd.
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