Abstract: This feeder line includes: a plate-shaped dielectric substrate; a first conductor pattern dividing a first surface of the dielectric substrate into a first area and a second area; a first-area ground conductor pattern formed in the first area; a second-area ground conductor pattern formed in the second area; a second-surface ground conductor pattern formed on a second surface; a second conductor pattern connecting the first conductor pattern and one or both of the first-area ground conductor pattern and the second-area ground conductor pattern; a plurality of conductors and connecting between the second-surface ground conductor pattern, and the first-area ground conductor pattern and the second-area ground conductor pattern; and a conductive member connecting the first-area ground conductor pattern and the second-area ground conductor pattern. A length of the second conductor pattern is an odd multiple of ¼ of a wavelength of a signal propagating through the first conductor pattern.

Abstract: Waveguide slot array antennas each having slots, that transmit or receive electromagnetic waves and that are formed in a front surface of a waveguide and waveguide slot array antennas each having slots that transmit or receive electromagnetic waves and that are formed in a front surface of a waveguide, and the waveguide slot array antennas and the waveguide slot array antennas are alternately arranged, the waveguide is a ridge waveguide having a ridge formed inside the waveguide, and the waveguide is a ridge waveguide having ridges, formed inside the waveguide.

Abstract: A converter includes an electrical opening which is a loop pattern, at one end of a conductor pattern located immediately above one end of a waveguide with a dielectric substrate interposed therebetween.

Abstract: A polarized waveguide filter is formed in which the polarized waveguide filter includes a first rectangular waveguide; a second rectangular waveguide; and a rectangular cavity resonator that has a first edge surface connected to an electromagnetic wave exit plane of the first rectangular waveguide via a coupling unit, and has a second edge surface facing the first edge surface and connected to an electromagnetic wave incident plane of the second rectangular waveguide via a coupling unit, and excites each of a TE10 mode and a TE20 mode of an electromagnetic wave, and the rectangular cavity resonator has two first wall surfaces and two second wall surfaces narrower in area than the first wall surfaces, and a protrusion that shifts a resonance frequency of the TE10 mode and a resonance frequency of the TE20 mode by respective amounts different from each other is provided on at least one of the two first wall surfaces, in such a way as to protrude outward from the rectangular cavity resonator.

Abstract: A waveguide unit (2) is closed at one end thereof by a short circuit plane (2a) provided with through holes (3-1 to 3-6). Radio wave absorbers (4-1 to 4-6) absorb a frequency signal being a non-reflective target in the state of being inserted through the through holes (3-1 to 3-6) toward the inside of the waveguide unit (2) and contacting inner surfaces (3?-1 to 3?-6) of the through holes (3-1 to 3-6).

Abstract: A square waveguide (1) has four ridges (6a, 6b, 7a, 7b). The cross section of the square waveguide (1) perpendicular to a waveguide axial direction is square. Inside the square waveguide (1), two rectangular waveguide terminals (4, 5) are formed by partitioning the inside along the waveguide axial direction. A septum phase plate (2) formed to get narrower stepwisely as its gets closer to a square waveguide terminal (3) opposite to the rectangular waveguide terminals (4, 5) is provided. A projecting portion (8) is provided on a part of a ridge (7b) formed on a ridge-side wall surface opposite to a wall surface, the septum phase plate (2) being joined to the wall surface in a part where the septum phase plate has largest width, the projecting portion (8) being larger than other parts of the ridge (7b) in a cross-sectional shape perpendicular to the waveguide axial direction.

Abstract: A square waveguide (1) has four ridges (6a, 6b, 7a, 7b). The cross section of the square waveguide (1) perpendicular to a waveguide axial direction is square. Inside the square waveguide (1), two rectangular waveguide terminals (4, 5) are formed by partitioning the inside along the waveguide axial direction. A septum phase plate (2) formed to get narrower stepwisely as its gets closer to a square waveguide terminal (3) opposite to the rectangular waveguide terminals (4, 5) is provided. A projecting portion (8) is provided on a part of a ridge (7b) formed on a ridge-side wall surface opposite to a wall surface, the septum phase plate (2) being joined to the wall surface in a part where the septum phase plate has largest width, the projecting portion (8) being larger than other parts of the ridge (7b) in a cross-sectional shape perpendicular to the waveguide axial direction.

Abstract: A converter includes an electrical opening which is a loop pattern, at one end of a conductor pattern located immediately above one end of a waveguide with a dielectric substrate interposed therebetween.

Abstract: A waveguide unit (2) is closed at one end thereof by a short circuit plane (2a) provided with through holes (3-1 to 3-6). Radio wave absorbers (4-1 to 4-6) absorb a frequency signal being a non-reflective target in the state of being inserted through the through holes (3-1 to 3-6) toward the inside of the waveguide unit (2) and contacting inner surfaces (3?-1 to 3?-6) of the through holes (3-1 to 3-6).

Abstract: An input waveguide (6) having one end connected between an L-shaped waveguide (1a) and an L-shaped waveguide (1f) and another end connected to the PORT (1); an output waveguide (7) having one end connected between the L-shaped waveguide (1a) and a flat waveguide (1b) and another end connected to the PORT (2); an output waveguide (8) having one end connected between the flat waveguide (1b) and an L-shaped waveguide (1c) and another end connected to the PORT (3); an output waveguide (9) having one end connected between the L-shaped waveguide (1c) and an L-shaped waveguide (1d) and another end connected to the PORT (4); and a plurality of branching waveguides (10) each having one end connected to the output waveguide (7) and another end connected to the output waveguide (8) are provided.

Abstract: Waveguide slot array antennas each having slots, that transmit or receive electromagnetic waves and that are formed in a front surface of a waveguide and waveguide slot array antennas each having slots that transmit or receive electromagnetic waves and that are formed in a front surface of a waveguide, and the waveguide slot array antennas and the waveguide slot array antennas are alternately arranged, the waveguide is a ridge waveguide having a ridge formed inside the waveguide, and the waveguide is a ridge waveguide having ridges, formed inside the waveguide.

Abstract: An input waveguide (6) having one end connected between an L-shaped waveguide (1a) and an L-shaped waveguide (1f) and another end connected to the PORT (1); an output waveguide (7) having one end connected between the L-shaped waveguide (1a) and a flat waveguide (1b) and another end connected to the PORT (2); an output waveguide (8) having one end connected between the flat waveguide (1b) and an L-shaped waveguide (1c) and another end connected to the PORT (3); an output waveguide (9) having one end connected between the L-shaped waveguide (1c) and an L-shaped waveguide (1d) and another end connected to the PORT (4); and a plurality of branching waveguides (10) each having one end connected to the output waveguide (7) and another end connected to the output waveguide (8) are provided.

Abstract: To achieve a phase shift circuit capable of obtaining good reflection characteristics and a desired phase shift amount at the center frequency without increasing the length in the propagating direction, the phase shift circuit includes: an input waveguide having an input terminal at one end; an output waveguide having an output terminal at one end; a middle waveguide whose thickness is thinner than a thickness of the input waveguide or the output waveguide and whose central position in a thickness direction different from a central position in the thickness direction of the input waveguide or the output waveguide; a first tapered waveguide which connects another end of the input waveguide with one end of the middle waveguide; and a second tapered waveguide which connects another end of the output waveguide with another end of the middle waveguide.

Abstract: A third coupler (3c) outputs a signal outputted from a first coupler (3a) to an input terminal (8-1) of a second septum polarizer (8b), and outputs a signal outputted from a second coupler (3b) to an input terminal (8-2) of a first septum polarizer (8a).

Abstract: A circularly polarized wave generator includes a rectangular hollow waveguide (1), a plurality of first protrusions (2) that are provided on one pair of opposing wall surfaces in the waveguide (1), have longitudinal directions orthogonal to an axial direction of the waveguide (1), and are arranged at intervals along the axial direction, and a plurality of second protrusions (3) that are provided between the first protrusions (2) on the wall surfaces and are arranged with longitudinal directions thereof running along the axial direction.

Abstract: A circularly polarized wave generator includes a rectangular hollow waveguide (1), a plurality of first protrusions (2) that are provided on one pair of opposing wall surfaces in the waveguide (1), have longitudinal directions orthogonal to an axial direction of the waveguide (1), and are arranged at intervals along the axial direction, and a plurality of second protrusions (3) that are provided between the first protrusions (2) on the, all surfaces and are arranged with longitudinal directions thereof running along the axial direction.