| 摘要 |
PROBLEM TO BE SOLVED: To attenuate a common mode current which is an electromagnetic noise source over a wide band at an optional frequency and to minimize the loss in a differential mode current. SOLUTION: A common mode filter is provided with structure in which a pair of upper and lower conductor layers 8, 9 for grounding are formed on the front and rear surfaces of a dielectric substrate and a pair of line conductors LN1, LN2 are provided in parallel between a pair of the conductor layers 8, 9 for grounding in the dielectric substrate. Here, a pair of the line conductors LN1, LN2 are provided with a pair of conductor patterns 18, 19 at an intermediate part to mutually and electrically connect a pair of conductor patterns 16, 17 whose patterns are formed proximately and in parallel with the conductor layer 8 with a pair of conductor patterns 20, 21 whose patterns are formed proximately and in parallel with the conductor layer 9 for grounding and a pair of the conductive patterns 18, 19 at the intermediate part are provided in parallel with the conductor layers 8, 9 for grounding.
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