| 摘要 |
PURPOSE:To obtain an incorporated type distribution constant type filter with excellent spurious characteristic by arranging a resonance unit having a different characteristic impedance in axial direction and a resonance unit with uniform characteristic impedance in the axial direction in combination with one dielectric block. CONSTITUTION:The uniform impedance resonator, that is, a resonance unit comprising an inner conductor 20b and the uniform impedance resonator of the next stage, that is, a resonance unit comprising inner conductor 20c are coupled by a coupling slit 22. Further, the uniform impedance resonator, that is, the resonance unit comprising the inner conductor 20c and the stepped impedance resonator of the final stage, that is, the resonance unit comprising an inner conductor 20d are coupled mutually by the difference in the characteristic impedances. Thus,all the resonance units are coupled sequentially to constitute a distributed constant type filter 10 as a band-pass filter.
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