Dielectric waveguide device, phase shifter, high frequency switch, and attenuator provided with dielectric waveguide device, high frequency transmitter, high frequency receiver, high frequency transceiver, radar device, array antenna, and method of manufacturing dielectric waveguide device

A dielectric waveguide device comprising:

• A dielectric part comprises
• a first dielectric part including a variable park, which varies in at least one of dielectric constant and dimension of the variable part in accordance with an applied electric field, and
• second dielectric parts, which have a dielectric constant lower than the first dielectric constant of the first dielectric part and between which the first dielectric part is sandwiched;
• a pair of plate conductor parts between which the dielectric part is sandwiched in a direction perpendicular to a propagation direction of electromagnetic wave propagating along the dielectric part and a lamination direction of the first and second dielectric parts;
• and
• a pair of electrodes between which the dielectric part is sandwiched in the lamination direction, and which are spaced from each other at an interval smaller than an interval between the pair of plate conductor parts, the electrodes configured to apply the electric field to the variable part.

A dielectric waveguide device comprising:

• a transmission line comprising a dielectric part including a variable part which varies at least one of a dielectric constant and a dimension of the variable part in accordance with an applied electric field, and that is configure to propagate an electromagnetic wave;
• and
• an electrode thinner than a skin depth for the frequency of the electromagnetic wave propagating along the transmission line, and that is embedded in the dielectric part, the electrode configure to apply the electric field to the variable part,
• wherein a ratio of fc and f satisfies the condition 1.03<f/fc<1.5, where fc is a cutoff frequency and f is the frequency of electromagnetic wave propagating along the dielectric waveguide in a case where a prescribed voltage is applied to the pair of electrodes.

A dielectric waveguide tube device comprising:

• a dielectric part comprising a variable part which varies at least one of a dielectric constant and a dimension of the variable part in accordance with an applied electric field, and that is configured to propagate an electromagnetic wave;
• and
• a conductor part comprising a pair of electrodes configured to apply the electric field to the variable part, and surrounds the dielectric part to form a waveguide tube,
• wherein the dielectric part further comprises second dielectric parts between which the variable part is sandwiched and which have a lower dielectric constant than the variable part, and
• wherein the electrode is between the variable part and the second dielectric parts.