1. JP2002026610 - FILTER

PROBLEM TO BE SOLVED: To provide a small-sized dielectric waveguide band pass filter with a low loss that has a small characteristic change in the case of mounting.

SOLUTION: Conductor layers 2a, 2c are formed on a front side and a rear side of a dielectric board 1 and connected to upper lower conductor layers 2a, 2c via via-holes 3a. At least two lines of the via-holes 3a are formed along a signal propagation direction. Resonators are configured by forming via-holes 3b in a dielectric waveguide consisting of the upper lower conductor layers 2a, 2c and the via-holes 3a at an interval of 1/2 of a guide wavelength or below along the signal propagation direction. Furthermore, by coupling the resonators adjacent to each other via the via-holes 3b configuring the inductive window, the dielectric band pass filter is configured. Moreover, a coplanar line 4 using the conductor layer 2a for ground and the conductor layer 2b for a signal conductor is provided onto a front side of the dielectric board 1 in a way of bridging over the inductive window formed by the via-holes 3b.

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