Dielectric filter, array antenna device

A dielectric filter, comprising:

• a first multilayer dielectric substrate, which includes a plurality of conductor layers formed so as to be separated apart from each other in a laminating direction, and is configured to propagate a high-frequency signal;
• and
• a second multilayer dielectric substrate, which includes a plurality of conductor layers formed so as to be separated apart from each other in the laminating direction, and is configured to propagate a high-frequency signal, the second multilayer dielectric substrate being formed so as to overlap the first multilayer dielectric substrate in the laminating direction of the first multilayer dielectric substrate,
• wherein, in a connection structure for propagating the high-frequency signal, the first multilayer dielectric substrate includes:
• a first strip line formed in a planar direction of the first multilayer dielectric substrate;
• a first dielectric waveguide formed in the laminating direction of the first multilayer dielectric substrate;
• and
• a first strip line-waveguide converter configured to perform transmission line conversion between the first strip line and the first dielectric waveguide,
• wherein the second multilayer dielectric substrate includes:
• a second strip line formed in a planar direction of the second multilayer dielectric substrate;
• a second dielectric waveguide formed in a laminating direction of the second multilayer dielectric substrate;
• and
• a second strip line-waveguide converter configured to perform transmission line conversion between the second strip line and the second dielectric waveguide,
• wherein the first dielectric waveguide is connected to the second dielectric waveguide from a first aperture of the first multilayer dielectric substrate formed on a side opposing the second multilayer dielectric substrate, via a first space secured between the first multilayer dielectric substrate and the second multilayer dielectric substrate and a second aperture of the second multilayer dielectric substrate formed on a side opposing the first multilayer dielectric substrate,
• wherein the dielectric filter further comprises a choke structure arranged around the first aperture and the second aperture of at least one multilayer dielectric substrate of the first multilayer dielectric substrate and the second multilayer dielectric substrate sandwiching the first space,
• wherein the choke structure includes the first space and a second space secured in the at least one multilayer dielectric substrate,
• wherein the second space has a cutout in a surface layer of the at least one multilayer dielectric substrate, and
• wherein a part from an end of each of the first aperture and the second aperture to an end portion of the second space including the first space corresponds to λ/2, where λ represents a free space wavelength of a signal wave.

A dielectric filter, comprising:

• a multilayer dielectric substrate, which includes a plurality of conductor layers formed so as to be separated apart from each other in a laminating direction, and is configured to propagate a high-frequency signal;
• a first strip line and a second strip line, which are formed so as to extend in a planar direction in conductor layers that are arranged so as to be separated away from each other in the laminating direction;
• a third strip line formed so as to extend in the planar direction in one of the conductor layers in which the second strip line is formed;
• a vertical dielectric waveguide, which is arranged between the first strip line and each of the second strip line and the third strip line of the multilayer dielectric substrate, and is formed in the laminating direction of the multilayer dielectric substrate and formed of a plurality of conductor layers extending in the planar direction and conductor posts extending in the laminating direction;
• a first strip line-waveguide converter, which is formed in the planar direction in another of the conductor layers in which the first strip line is formed, and is configured to perform transmission line conversion between the vertical dielectric waveguide and the first strip line;
• a second strip line-waveguide converter, which is formed in the planar direction in the one of the conductor layers in which the second strip line is formed, and is configured to perform transmission line conversion between the vertical dielectric waveguide and the second strip line;
• and
• a third strip line-waveguide converter, which is formed in the planar direction in the one of the conductor layers in which the third strip line is formed, and is configured to perform transmission line conversion between the vertical dielectric waveguide and the third strip line,
• the first strip line-waveguide converter including:
• a first planar dielectric waveguide formed in the planar direction, the first planar dielectric waveguide having one end connected to the first strip line, and another end connected to the vertical dielectric waveguide;
• and
• a first back-short waveguide having one end connected to the first strip line, and another end that is short-circuited,
• the second strip line-waveguide converter including:
• a second planar dielectric waveguide formed in the planar direction, the second planar dielectric waveguide having one end connected to the second strip line, and another end connected to a part of the vertical dielectric waveguide and a part of the third strip line-waveguide converter;
• and
• a second back-short waveguide having one end connected to the second strip line, and another end connected to a part of the third strip line-waveguide converter,
• the third strip line-waveguide converter including:
• the second planar dielectric waveguide formed in the planar direction, the second planar dielectric waveguide having one end connected to the third strip line, and another end connected to a part of the vertical dielectric waveguide and a part of the second strip line-waveguide converter;
• and
• a third back-short waveguide having one end connected to the third strip line, and another end connected to a part of the second strip line-waveguide converter.