Coaxial type impedance matching device

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
• an output side dielectric disposed in the matching device body, wherein:
• the input side dielectric and the output side dielectric are slidable between an signal input portion of the matching device body and a signal output portion of the matching device body;
• the matching device body includes a connector portion for connecting to an external device;
• and
• the internal conductor and the external conductor protrude by a predetermined length from at least one of the signal input portion and the signal output portion to form the connector portion.

A coaxial type impedance matching device comprising:

• a tubular external conductor;
• an internal conductor disposed in the external conductor and constructing a transmission line for a signal together with the external conductor;
• dielectrics disposed in clearance between an inner face of the external conductor and an outer face of the internal conductor, the dielectric being movable in a longitudinal direction of the internal conductor;
• position changing means for changing a position of the dielectric in the longitudinal direction of the internal conductor from outside of the external conductor;
• and
• a shielding mechanism for reducing leakage of electromagnetic waves caused by the signal.

A coaxial type impedance matching device comprising:

• a tubular external conductor erected upright;
• an internal conductor disposed in the external conductor, for constructing a transmission line for a signal together with the external conductor;
• and
• a pair of cover members disposed in clearance between an inner face of the external conductor and an outer face of the internal conductor, the cover members disposed at a spacing from each other, wherein:
• opposed surfaces of the cover members, the inner face of the external conductor, and the outer face of the internal conductor form a liquid chamber;
• and
• the external conductor includes:
• a liquid pumping port for pumping a liquid dielectric from a lower side of the liquid chamber into the liquid chamber;
• and
• an air hole communicating with an upper side of the liquid chamber.