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| Method and apparatus for severing and edge-sealing thermoplastic films, and product |
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| Extruded plastics net or mesh structures |
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| Nonaqueous electrochemical cell |
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| Integrated electrode/separator structures |
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| Coatings for electrochemical electrodes and methods of making the same |
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| Composite coating for electrochemical electrode and method |
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| Basic aluminum chlorosulfate flocculant |
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| Electrochemical cell |
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| Rechargeable lithiated thin film intercalation electrode battery |
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Planar T-type LC filter with recesses between terminal electrodes
| Details |
Inventors: Yoshimura, Tamotsu;
Assignee: Rohm Co., Ltd. (Kyoto, JP)
Primary Examiner: Lee; Benny
Assistant Examiner: Bettendorf; Justin P.
Attorney, Agent or Firm: Nikaido, Marmelstein, Murray & Oram
Two coil devices are formed by forming two winding conductors on an insulating substrate by printing. A capacitor device is formed on the insulating substrate by printing a conductor, a dielectric substance and a conductor in this order. An end of each coil device is connected to a terminal of the capacitor device to form a small chip LC filter for high frequency band. |
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DETAILED DESCRIPTION An object of the present invention is to provide a chip filter part which has a sufficient inductance in the high-frequency band, in which the inductance of the coil and the capacitance of the capacitor can separately be set, the size of which is reduced and which has an excellent packaging capability.
To achieve the above-mentioned object, in a chip filter of the present invention, a capacitor and two substantially winding coils are formed on an insulating substrate by printing, and three terminal electrodes are provided at an end of the insulating substrate.
One end of each coil and a first electrode of the capacitor are connected to different terminal electrodes, and another end of each coil is connected to a second electrode of the capacitor.
Generally, a conductor formed into a winding has a small inductance as a coil, so that an inductance sufficient for a filter circuit cannot be obtained.
However, when a filter circuit is formed which uses one of the two terminals 20a and 20b of an equivalent circuit of FIG.
9 as an input and the other as an output, a resonance frequency f is ##EQU1## so that the circuit can function as a filter circuit in the high frequency band even if the inductance of the coil is small.
The winding conductor and the dielectric substance of the capacitor can be formed by the thick film printing on the insulating substrate, so that a small-size chip filter is realized according to the above-mentioned features.
The chip filter may be of a structure where in addition to the above-mentioned features, a resistor is formed on the insulating substrate by printing, and a fourth terminal electrode is provided at an end of the insulating substrate to connect the resistor with the second electrode of the capacitor and the fourth terminal electrode.
In this case, the flow of noise into the filter circuit is reduced, so that the stability of the filter circuit improves.
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Fuel Cells 
