| 摘要 |
<p>A helical filter is constructed by coupling a plurality of helical oscillators (4, 5; 54, 55). The oscillators (4, 5; 54, 55) have the same resonant frequency or the same harmonic frequency and have different harmonic frequencies or resonant frequencies, respectively. The oscillators (4, 5) have the same resonant frequency by adjusting the distributed capacities (C1, C2) thereof, respectively, and have different harmonic frequencies by varying the lengths of coils (L1, L2). Furthermore the oscillators (54, 55) have different resonant frequencies by varying the distributed capacities (C3, C4), respectively, and have the same harmonic frequency by using coils (L5, L6) having same length.</p> |
