Abstract: A transmission line assembly is configured such that (i) a first target inner layer is one of second to (N?1)-th pattern layers selected therefrom, and (ii) a second target inner layer is another one of the second to (N?1)-th pattern layers selected therefrom; the second to (N?1)-th pattern layers except for the first and second target inner layers are referred to as inner layers. The transmission line assembly includes band-like first and second slits formed through the ground pattern of a corresponding one of the first and second target inner layers to expose a part of one of dielectric layers; the one of the dielectric layers is adjacent to the corresponding one of the first and second target inner layers. Each of the first and second slits has an edge facing the interlayer line, and the edge of each of the first and second slits is concavely curved toward the interlayer line.

Abstract: An antenna apparatus includes a first antenna, a second antenna, and a third antenna. Each of the second antenna and the third antenna transmits a radio-wave signal in a predetermined emitting direction. The first antenna receives a reflection signal resulting from the transmission signal transmitted in the predetermined emitting direction. The second antenna and the third antenna are arranged to be separate from one another in a second direction. The second antenna and the first antenna are arranged to be separate from each other in the first direction, and at least partially overlap each other as viewed in a first direction.

Abstract: A multilayer transmission line includes a multilayer substrate. The multilayer substrate includes a plurality of conductor layers stacked in a predetermined direction with dielectric layers interposed therebetween. The conductor layers in an inner layer part include ground planes, respectively. The inner layer part includes a conductor hole part. The conductor hole part is provided penetrating the respective ground planes in the inner layer part in the predetermined direction. The conductor hole part includes a conductor part to electrically connect the ground planes together. The conductor layer in an outer layer part includes a transmission line and a conversion part. The outer layer part includes the conductor layer as the outermost layer and an inner conductor layer.

Abstract: An antenna apparatus includes a conductor layer A, a conductor layer B, and a dielectric layer that is sandwiched between the conductor layer A and the conductor layer B. In the conductor layer A, a first antenna, a second antenna, and a connection conductor are formed. The connection conductor is connected to both of the first antenna and the second antenna. In the dielectric layer, a guard conductor is provided. The guard conductor is arranged along an outer periphery of the connection conductor that excludes at least a first connection section and a second connection section of the connection conductor. The first connection section is a connection section of the connection conductor that is connected to the first antenna. The second connection section is a connection section of the connection conductor that is connected to the second antenna.

Abstract: A double-sided board includes a first-type conductor layer, a second-type conductor layer, a waveguide-filled dielectric layer and a waveguide. The waveguide-filled dielectric layer is a dielectric layer provided between the first-type conductor layer and the second-type conductor layer. The waveguide is provided in such a manner as to penetrate the waveguide-filled dielectric layer in a direction from one of the first-type conductor layer and the second-type conductor layer to the other of the two conductor layers. A cross section of the waveguide in a plane parallel to the first-type conductor layer has a longitudinal direction and a lateral direction perpendicular to the longitudinal direction. The cross section of the waveguide has, along the longitudinal direction, a central part and two end parts located respectively on two sides of the central part. A lateral length of each of the end parts is larger than a lateral length of the central part.

Abstract: A transmission antenna unit includes transmission antennas arranged in a row along a predetermined array direction at a predetermined first interval. A reception antenna unit includes reception antennas arranged in a row along the array direction at a second interval set to differ from the first interval. The transmission antennas and the reception antennas form a virtual array in which virtual reception antennas are arranged in a row along the array direction. The first interval is equal to a multiplication value of a minimum interval being a minimum value of an arrangement interval of the virtual reception antennas and a first multiple being an integer of 2 or greater. The second interval is equal to a multiplication value of the minimum interval and a second multiple being an integer of 2 or greater and set to differ from the first multiple. The first and second multiples are coprime.

Abstract: An antenna device for receiving radio wave signals includes antenna groups. Each of the antenna groups includes unit antennas arranged in a predetermined direction. The antenna groups are arranged in the predetermined direction at equal intervals. The unit antennas in each of the antenna groups are arranged at two or more different intervals in the predetermined direction in the antenna device.

Abstract: A transmission line assembly is configured such that (i) a first target inner layer is one of second to (N?1)-th pattern layers selected therefrom, and (ii) a second target inner layer is another one of the second to (N?1)-th pattern layers selected therefrom; the second to (N?1)-th pattern layers except for the first and second target inner layers are referred to as inner layers. The transmission line assembly includes band-like first and second slits formed through the ground pattern of a corresponding one of the first and second target inner layers to expose a part of one of dielectric layers; the one of the dielectric layers is adjacent to the corresponding one of the first and second target inner layers. Each of the first and second slits has an edge facing the interlayer line, and the edge of each of the first and second slits is concavely curved toward the interlayer line.

Abstract: Transmission antennas are aligned at a reference distance along a preset direction of alignment. The aperture width of a first reception antenna in the direction of alignment is set to a first width which is less than the reference distance. Second reception antennas each have an aperture width in the direction of alignment set to a second width which is the first width or less and are aligned at a distance which is less than the reference distance along the direction of alignment. The distance between the position of the center of the first reception antenna and the phase center of a second reception antennal located closest to the first reception antenna among the second reception antennas is set to a length that is greater than or equal to the value obtained by multiplying the reference distance by the value obtained by subtracting 1 from the number of transmission antennas.

Abstract: A multilayer transmission line includes a multilayer substrate. The multilayer substrate includes a plurality of conductor layers stacked in a predetermined direction with dielectric layers interposed therebetween. The conductor layers in an inner layer part include ground planes, respectively. The inner layer part includes a conductor hole part. The conductor hole part is provided penetrating the respective ground planes in the inner layer part in the predetermined direction. The conductor hole part includes a conductor part to electrically connect the ground planes together. The conductor layer in an outer layer part includes a transmission line and a conversion part. The outer layer part includes the conductor layer as the outermost layer and an inner conductor layer.

Abstract: A transmission antenna unit includes transmission antennas arranged in a row along a predetermined array direction at a predetermined first interval. A reception antenna unit includes reception antennas arranged in a row along the array direction at a second interval set to differ from the first interval. The transmission antennas and the reception antennas form a virtual array in which virtual reception antennas are arranged in a row along the array direction. The first interval is equal to a multiplication value of a minimum interval being a minimum value of an arrangement interval of the virtual reception antennas and a first multiple being an integer of 2 or greater. The second interval is equal to a multiplication value of the minimum interval and a second multiple being an integer of 2 or greater and set to differ from the first multiple. The first and second multiples are coprime.

Abstract: Transmission antennas are aligned at a reference distance along a preset direction of alignment. The aperture width of a first reception antenna in the direction of alignment is set to a first width which is less than the reference distance. Second reception antennas each have an aperture width in the direction of alignment set to a second width which is the first width or less and are aligned at a distance which is less than the reference distance along the direction of alignment. The distance between the position of the center of the first reception antenna and the phase center of a second reception antennal located closest to the first reception antenna among the second reception antennas is set to a length that is greater than or equal to the value obtained by multiplying the reference distance by the value obtained by subtracting 1 from the number of transmission antennas.

Abstract: An oil separation device of an internal combustion engine includes a gas liquid separation chamber defined by a head cover of the engine, a gas introduction passage connected to a first end of the gas liquid separation chamber at an angle to the first direction, a gas inlet formed in an end of the gas introduction passage remote from the gas liquid separation chamber, and a gas outlet formed in a second end of the gas liquid separation chamber. Oil splashed from a valve actuating chamber of the engine is prevented from entering the oil separation device, and oil mist can be effectively separated from blow by gas.

Abstract: A collective lamination substrate N is provided with pattern layers having N number of layers, where N is an integer and 4 or more, a pseudo waveguide formed penetrating through the pattern layers in a lamination direction, a converter section formed in the pattern layers, mutually converting between an electrical signal and radio waves being transmitted and received via the pseudo waveguide, and ground patterns formed in the pattern layers, covering a periphery of a waveguide formation section. The collective lamination substrate further includes: antennas formed in the waveguide formation section; a first via group provided in a periphery of the waveguide formation section; and a second via group provided in a periphery of the waveguide formation section and positioned at a more outer portion than the first via group.

Abstract: An antenna device for receiving radio wave signals includes antenna groups. Each of the antenna groups includes unit antennas arranged in a predetermined direction. The antenna groups are arranged in the predetermined direction at equal intervals. The unit antennas in each of the antenna groups are arranged at two or more different intervals in the predetermined direction in the antenna device.

Abstract: An oil separation device of an internal combustion engine includes a gas liquid separation chamber defined by a head cover of the engine, a gas introduction passage connected to a first end of the gas liquid separation chamber at an angle to the first direction, a gas inlet formed in an end of the gas introduction passage remote from the gas liquid separation chamber, and a gas outlet formed in a second end of the gas liquid separation chamber. Oil splashed from a valve actuating chamber of the engine is prevented from entering the oil separation device, and oil mist can be effectively separated from blow by gas.

Abstract: A rotary valve and a quick exhaust valve for a railway vehicle in which high sealability and operability at the time of valve opening and closing are ensured. Outflow/inflow ports (10, 11) and a discharge port (12) are formed in a valve body accommodating part having a spherical surface part or a tapered surface part formed on part of an inner periphery in a body (2), and a valve body (3) is rotatably inserted from an opening which is open from the valve body accommodating part. A spherically-shaped surface part or a tapered-shaped surface part is formed at a position opposing the spherical surface part or the tapered surface part, a plurality of through ports communicating the outflow/inflow ports or the discharge port and an attachment groove opposing the outflow/inflow ports in a direction crossing the through ports are formed, and a seal member is attached to the attachment groove.

Abstract: A collective lamination substrate N is provided with pattern layers having N number of layers, where N is an integer and 4 or more, a pseudo waveguide formed penetrating through the pattern layers in a lamination direction, a converter section formed in the pattern layers, mutually converting between an electrical signal and radio waves being transmitted and received via the pseudo waveguide, and ground patterns formed in the pattern layers, covering a periphery of a waveguide formation section. The collective lamination substrate further includes: antennas formed in the waveguide formation section; a first via group provided in a periphery of the waveguide formation section; and a second via group provided in a periphery of the waveguide formation section and positioned at a more outer portion than the first via group.

Abstract: A rapid exhaust valve for railway vehicles and a piping system of a railway vehicle, the piping system using the rapid exhaust valve, are provided. The rapid exhaust valve rapidly discharges pressure air from an automatic door opening/closing gear of a railway vehicle to allow manual operation of an automatic door, is made compact in overall size while giving an exhaust outlet a large bore diameter to reduce a venting time to keep it within a given time, shows superior operability to certainly prevent leakage at channel switching, allows a change in a piping direction and an operation direction according to an installation location while keeping the number of components small, and switches a channel to allow rapid venting from a desired pipeline.