| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a filter component which is used for a high-frequency device, such as a portable telephone or the like and to integrated a band-pass filter with an impedance converter, using a simple constitution. SOLUTION: A parallel-tuned band-pass filter is a filter, in which at least one resonator is formed by the electromagnetic coupling among resonators. An inductor, which constitutes one resonator, is constituted by the serial connection of a first inductor to a second inductor; an inductor which constitutes the other resonator is constituted by parallel connection of a third inductor to a fourth inductor; and when electromagnetic-field coupling is formed across the third inductor and the fourth inductor, realize a small-sized filter component operating as a parallel-tuned two-stage band-pass filter and which is easy to constitute of extremely thin wires is realized.</p> |
