PURPOSE: To suppress the degradation in the device characteristic such as the efficiency, to miniaturize a device itself and to contrive the reduction in cost by suppressing the dispersion in the resonance frequency fr of a resonance circuit section.

CONSTITUTION: An inductor 3 and a capacitor 4 are formed on a substrate 2 whose surface roughness is small in which the pattern size accuracy is ±several μm when the inductor 3 is formed to constitute an LC resonance circuit section, the LC resonance circuit section is mounted on a high frequency signal transmission board 1 together with other circuit component such as an FET 7 and connected to a distributed constant line 6.