| 摘要 |
This invention is a filter circuit having a filter element. A filter element ( 4 ) is a parallel resonator circuit including a pair of first resonator lines ( 19 a) ( 19 b) formed by a thick film forming technique and a pair of second resonator lines ( 20 a) ( 20 b). As the thickness of the pair of second resonator lines ( 20 a) ( 20 b) is significantly reduced, the impedance ratio between the pair of second resonator lines ( 20 a) ( 20 b) and the pair of first resonator lines ( 19 a) ( 19 b) is increased. Therefore, the length of these pairs of resonator lines ( 19 a) ( 19 b) ( 20 a) ( 20 b) is reduced and miniaturization of the filter element is realized.
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