| 摘要 |
A high-frequency filter for cutting off a specific frequency element of a high-frequency signal, includes a transmission line for transmitting the high-frequency signal; and a plurality of branch lines, formed in a direction which intersects the transmission line, having a coupling part at which the branch lines are electromagnetically coupled with each other. Typically, one or more pairs of the adjacent branch lines are provided, wherein the branch lines are electromagnetically coupled in each pair; and the coupling part is provided on the middle or head of the branch lines. Preferably, each branch line has: a first pattern, whose width is smaller than that of the transmission line, and which functions as an inductance element with respect to the high-frequency signal; and a second pattern, whose width is larger than that of the first pattern, and which forms the coupling part.
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