| 摘要 |
PURPOSE:To obtain a high frequency filter by providing plural U-shaped resonance lines on a dielectric substrate surface, connecting a capacity to a cutting part, making them into a tuning circuit, making the cutting part into a different direction mutually and making the protruded part for adjusting a trap close to a position opposite to the resonant line of an adjoining tuning circuit. CONSTITUTION:A tuning circuit 1 connects a capacity 8 to a U-shaped resonance line 20 and a cutting part 17 and an external connecting terminal 13 is connected through a capacity 11 to one edge of the cutting part 17. A tuning circuit 2 has a capacity 9 at a U-shaped resonance line 21 and a cutting part 19, a tuning circuit 3 has a capacity 10 at a U-shaped resonant line 22 and a cutting part 19 and an external connecting terminal 14 is connected through a capacity 12 to a cutting part 19. Protruded parts 4-7 for adjusting a trap are provided between resonant lines. Circuits 1-3 are arranged on a straight line and the direction is different by 90 deg. for cutting parts 17, 18 and 18, 19. A ground conductor 16 is provided on the rear surface of a dielectric substrate 15. By the constitution, a small high frequency filter having a good selectivity can be obtained.
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