Patent ID: 6856211

Claim:
A coaxial type impedance matching device comprising: a matching device body including a tubular external conductor and an internal conductor arranged in the external conductor; an input side dielectric disposed in the matching device body and including a first dielectric and a second dielectric; and an output side dielectric disposed in the matching device body and including a third dielectric and a fourth dielectric, wherein: the input side dielectric and the output side dielectric are slidable between a signal input portion of the matching device body and a signal output portion of the matching device body to adjust distance between a center position between the input side dielectric and the output side dielectric and one of the signal input portion and the signal output portion, and to adjust distance between opposed surfaces of the input side dielectric and the output side dielectric; distance between opposed surfaces of the first dielectric and the second dielectric is a predetermined distance, which is in a range of Nλ/4−λ6 to Nλ/4+λ/6, where λ represents a guide wavelength of an input signal in the matching device body and N represents odd number; and distance between opposed surfaces of the third dielectric and the fourth dielectric is the predetermined distance.