PURPOSE: To realize a small-sized inexpensive LC filter by forming the filter with an electrode layer formed on the outside of a conductor for inductor use coated by an insulation layer so as to facilitate the formation of the filter even when the application of the filter is changed.
CONSTITUTION: An electrode layer 3 is formed on the outside of an insulation layer 2 except both ends and the middle part of a part on which a conductor 1 is wound in spiral and a ferrite magnetic core 4 is inserted to the inside of the middle part. The inductor is formed over the entire length of the conductor 1, and the conductor 1 and the electrode layer 3 are opposite to each other with the insulation layer 2 inbetween in a part A in which the electrode layer 3 is formed, a capacitor is formed between the conductor 1 and the conductor layer 3 and the electrode layer 3 is connected to ground. Thus, a desired circuit is easily and inexpensively formed and the size is made small.
KOBAYASHI SHINICHI
YUASA HISAO
KURIHARA HIDEOMI
