| 摘要 |
PROBLEM TO BE SOLVED: To provide a bandpass filter that can be configured on a plurality of stages and miniaturized further. SOLUTION: This bandpass filter is provided with a dielectric board 10, at least one conductor line 14 that is formed on one side of the dielectric board 10 and extended in directions of edges opposed to each other, an inner ground conductor that is formed on one side of the dielectric board 10 and in existence on both sides in the directions of the extension of the conductor line 14, slot lines 11, 12 that are specified by the conductor line 14 and the inner ground conductor, formed on one side of the dielectric board 10 and extended in parallel, and 1st and 2nd existing means that excite slot propagation mode to the slot lines 11, 12. The bandpass filter has a resonance point by each slot propagation mode generated in the slot lines 11, 12 and a coplanar propagation mode generated in the conductor line 14 respectively.
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