| 摘要 |
PROBLEM TO BE SOLVED: To solve problems of the conventional band pass filter that has had an increased size because a plurality of stages of high impedance lines with about 1/4 wavelength equivalent to a pass frequency is arranged for a dielectric board in use and has caused adverse effect on a pre-stage circuit of the band pass filter and a circuit being a pre-stage of the pre-stage circuit because a reflecting amount at frequency bands other than the pass frequency band is high. SOLUTION: Tip short-circuit stubs 11, 13 and an interdigital capacitor 10 are placed in aπ-shape. Furthermore, a termination resistor 2 is connected in series with the tip short-circuit stub 13 in the configuration of theπ-shape.
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