PURPOSE: To make communication equipment of mobile object thin and light in weight by reducing an occupied area at the time of mounting and decreasing a loss caused by the reflection of power as well.

CONSTITUTION: A ground electrode plane formed on the planar part of a dielectric at a microstrip line structure part 11 is connected with a ground electrode plane formed on the planar part of a dielectric at a strip line structure part 12. Line electrodes 11a and 11b of the microstrip line structure part are arranged so that its lengthwise direction can be vertical to a substrate surface (the surface where the filter is installed). Then, the reflection of power is suppressed by forming the filter so that one of line electrode can form an input/output terminal on the substrate surface.