Heat insulating transmission line, vacuum insulating chamber, wireless communication system

A vacuum insulating chamber with insulation, comprising:

• a housing whose inside can be maintained as a vacuum;
• a heat insulating transmission line capable of transmitting and receiving a signal between equipment and a circuit outside the housing, the equipment being housed inside the housing, the heat insulating transmission line including:
• a first waveguide with a first aperture end;
• a second waveguide with a second aperture end to be arranged coaxially with the first waveguide, the second aperture end facing the first aperture end through an air gap;
• a reflector to be provided outside the air gap, and to control radiation power from the air gap;
• and
• an airtight component to maintain the housing as a vacuum,
• wherein
• the first waveguide is mounted outside the housing, and the second waveguide is mounted inside the housing;
• wherein
• the reflector is substantially parallel to a portion of a virtual plane connecting an inner wall of the first aperture end of the first waveguide and an inner wall of the second aperture end of the second waveguide;
• wherein
• the reflector is longer than a length of the air gap in an extending direction of the first waveguide;
• and
• wherein
• a distance between the virtual surface and the reflector is not less than N×λ/2−0.05λ and not more than N×λ/2+0.2λ (N is a positive integer), when a mean frequency of a signal transmitting through the heat insulating transmission line is expressed as λ.

A wireless communication system, comprising:

• a signal processing circuit to perform transmission processing of send data to acquire a transmission signal;
• a power amplifier to amplify the transmission signal;
• a heat insulating transmission line to transmit the amplified transmission signal, including:
• a first waveguide with a first aperture end;
• a second wave guide with a second aperture end to be arranged coaxially with the first waveguide, the second aperture end facing the first aperture end through an air gap;
• and
• a reflector to be provided outside the air gap, and to control radiation power from the air gap,
• a filter to filter the transmission signal;
• and
• an antenna to radiate the filtered transmission signal as an electromagnetic wave into the air,
• wherein
• the reflector is substantially parallel to a portion of a virtual plane connecting an inner wall of the first aperture end of the first waveguide and an inner wall of the second aperture end of the second waveguide;
• wherein
• the reflector is longer than a length of the air gap in an extending direction of the first waveguide;
• and
• wherein
• a distance between the virtual surface and the reflector is not less than N×λ/2−0.05λ and not more than N×λ/2+0.2λ (N is a positive integer), when a mean frequency of a signal transmitting through the heat insulating transmission line is expressed as λ.