| 摘要 |
PROBLEM TO BE SOLVED: To provide a dual mode band pass filter that can be downsized, the characteristic of which can easily be adjusted, with a low insertion loss and that hardly acts like a noise source. SOLUTION: The dual mode band pass filter 1 has a tri-plate structure where ground electrodes 3, 6 are placed above and under a metallic film 9 via a dielectric substrate layer to configure a resonator, the ground electrodes 3, 6 are interconnected electrically by ground connection electrodes 7, 8, the ground electrodes 3, 6 and the ground connection electrodes 7, 8 apply electromagnetic shield to the metallic film 9, input output connection electrodes 12, 13 connected to input output coupling circuits 10, 11 are formed to end faces 2e, 2f of a dielectric board 2 and act like a resonance exciting source of a structure comprising the ground electrodes 3, 6 and the ground connection electrodes 7, 8.
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