| 摘要 |
<P>PROBLEM TO BE SOLVED: To miniaturize a filter circuit unit. <P>SOLUTION: A filter element 4 is a parallel resonance circuit, constituted of a pair of first resonance lines 19a, 19b which are formed using a thick film technique, and a pair of second resonance lines 20a, 20b formed using the thin film technique. By making the pair of the second resonance lines 20a, 20b substantially thinner, it becomes possible to increase the impedance ratio between the pair of the second resonance lines 20a, 20b and the pair of the first resonance lines 19a, 19b. As a result, the length of these pairs of the resonance lines 19a, 19b and 20a, 20b can be shortened, thus producing the filter element 4 of a reduced size and achieving a miniaturized filter circuit unit. <P>COPYRIGHT: (C)2003,JPO |
