| 摘要 |
<p>A filter circuit includes a filter element (4) which is a parallel resonance circuit having a pair of first resonance lines (19a, 19b) formed by the thick film formation technique and a pair of second resonance lines (20a, 20b) formed by the thin film formation technique. By significantly reducing the thickness of the pair of second resonance lines (20a, 20b), it is possible to increase the impedance ratio of the pair of second resonance lines (20a, 20b) and the pair of first resonance lines (19a, 19b), thereby reducing the length of the resonance lines (19a, 19b, 20a, 20b) and reducing the filter element size.</p> |
