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LC Filter
| Details |
Inventors: Kawaguchi, Masahiko;
Assignee: Murata Manufacturing Co., Ltd. (JP)
Primary Examiner: LaRoche; Eugene R.
Assistant Examiner: Ham; Seung
Attorney, Agent or Firm: Ostrolenk, Faber, Gerb & Soffen
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. |
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DETAILED DESCRIPTION Therefore, a principal object of the present invention is to provide a novel LC filer.
Another object of the present invention is to provide an LC filter without necessity to mount discrete components.
The other object of the present invention is to provide an LC filter capable of eliminating or removing the influence of stray capacitance due to an inductance conductor.
An LC filter in accordance with the present invention comprises a dielectric base plate, a plurality of inductance conductors formed on a main surface of the dielectric base plate, the plurality of inductance conductors constituting a plurality of inductors.
First and second capacitance electrodes are formed on one main surface or both main surfaces of the dielectric base plate so as to oppose to each other, and a capacitor is formed by the first and second capacitance electrodes.
Furthermore, first and second additional electrodes are formed on one main surface or both main surfaces of the dielectric base plate so as to oppose to each other, and a trimming capacitor is formed by the first and second additional electrodes, which is connected in parallel with at least one of the plurality of inductors.
In accordance with a present invention, since it is not necessary to mount discrete components, an LC filter capable of being simply manufactured at a low cost is obtainable.
In addition, since the capacitance value of the trimming capacitor can be adjusted by trimming the first and/or second additional electrodes, resonant frequencies determined by respective ones of the plurality of inductors can be made coincident with each other, and therefore a spurious response in a frequency characteristic can be suppressed.
These objects and other objects, features, aspecs and advantages of the present invention will become more apparent from the following detailed description of the embodiments of the present invention when taken in conjuncion with accompanying drawings.
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