Abstract: A 90-degree hybrid circuit includes a dielectric substrate, a first conductor that includes a conductor pattern formed on the dielectric substrate and electrically conducts between a first port and a second port, a second conductor that includes a conductor pattern formed on the dielectric substrate and electrically conducts between a third port and a fourth port, and a coupled line comprising a portion of the first conductor and a portion of the second conductor that face each other on front and back sides of the dielectric substrate. A first coupled line portion as the portion of the first conductor includes a coplanar line with first ground patterns formed to sandwich the first coupled line portion from both sides. A second coupled line portion as the portion of the second conductor includes a coplanar line with second ground patterns formed to sandwich the second coupled line portion from both sides.

Abstract: A phase shifter includes a signal conductor constituting a transmission line for a signal transmitted through an antenna element, a dielectric plate including a dielectric material disposed to face to the signal conductor, and a mobile mechanism for moving the dielectric plate. A facing area between the signal conductor and the dielectric plate is changed by a movement of the dielectric plate, to change a phase of the signal transmitted through the signal conductor. The dielectric plate includes a transformer unit for impedance matching between an overlapped portion in which the signal conductor faces to the dielectric plate and a non-overlapped portion in which the signal conductor does not face to the dielectric plate.

Abstract: A 90-degree hybrid circuit includes a dielectric substrate, a first conductor that includes a conductor pattern formed on the dielectric substrate and electrically conducts between a first port and a second port, a second conductor that includes a conductor pattern formed on the dielectric substrate and electrically conducts between a third port and a fourth port, and a coupled line comprising a portion of the first conductor and a portion of the second conductor that face each other on front and back sides of the dielectric substrate. A first coupled line portion as the portion of the first conductor includes a coplanar line with first ground patterns formed to sandwich the first coupled line portion from both sides. A second coupled line portion as the portion of the second conductor includes a coplanar line with second ground patterns formed to sandwich the second coupled line portion from both sides.

Abstract: A phase shifter includes a signal conductor constituting a transmission line for a signal transmitted through an antenna element, a dielectric plate including a dielectric material disposed to face to the signal conductor, and a mobile mechanism for moving the dielectric plate. A facing area between the signal conductor and the dielectric plate is changed by a movement of the dielectric plate, to change a phase of the signal transmitted through the signal conductor. The dielectric plate includes a transformer unit for impedance matching between an overlapped portion in which the signal conductor faces to the dielectric plate and a non-overlapped portion in which the signal conductor does not face to the dielectric plate.

Abstract: The antenna device includes a signal line that distributes input signals. The signal line includes a substrate, a pair of ground conductors opposite each other such as to sandwich the substrate, a first front side pattern and a second front side pattern formed on a front side of the substrate, and a first back side pattern and a second back side pattern formed on a back side of the substrate. While the first front side pattern is split, the second front side pattern is not split, and while the second back side pattern is split, the first back side pattern is not split. Parts of the split first front side pattern are conductive to each other via the first back side pattern, and parts of the split second back side pattern are conductive to each other via the second front side pattern.

Abstract: The antenna device includes a signal line that distributes input signals. The signal line includes a substrate, a pair of ground conductors opposite each other such as to sandwich the substrate, a first front side pattern and a second front side pattern formed on a front side of the substrate, and a first back side pattern and a second back side pattern formed on a back side of the substrate. While the first front side pattern is split, the second front side pattern is not split, and while the second back side pattern is split, the first back side pattern is not split. Parts of the split first front side pattern are conductive to each other via the first back side pattern, and parts of the split second back side pattern are conductive to each other via the second front side pattern.

Abstract: Disclosed is a variable phase shifter, the variable phase shifter including: a fixed board which is fixedly provided in a housing, and consisting of a dielectric board, and consisting of a dielectric board, having a second transfer stripline having at least one arc-shaped output micro stripline on one surface; a rotating board rotatably provided within the housing while coming in contact with the one surface of the fixed board, and consisting of a dielectric board, having a second transfer stripline coupled to the arc-shaped output micro stripline on a surface where the rotating board comes in contact with the one surface of the fixed board even when the rotating board rotates; wherein both the sides of at least one output micro stripline of the fixed board are connected to an output port, and the other surface of the fixed board includes an input micro stripline, so that the other surface of the fixed board is electrically connected and receives an input signal.

Abstract: Provided is a capacity loaded planar antenna with short stubs that can be brought to a small size and a low profile, achieves wider bandwidth, and can be tuned to multiple frequencies. A capacity loaded planar antenna with short stubs that has a simple structure and can be easily manufactured includes a base plate, an antenna element disposed so as to be parallel to the base plate, a plurality of short stubs that connect the antenna element to the base plate, and a side wall formed on the end of the base plate. The capacity loaded planar antenna achieves wider bandwidth with the small size and low profiled, can be tuned to multiple frequencies by adjusting the length of the short stubs, and uses plate-shaped foldable short stubs that are integrated with the antenna element.

Abstract: Disclosed is a variable phase shifter The variable phase shifter includes a housing; a fixed board unit fixedly installed inside the housing, equipped with an input microstrip line with a via hole for receiving an input signal on one face thereof, and equipped with at least one circular arc-shaped output microstrip line outside the input microstrip line; and a rotating board unit rotatably installed inside the housing while being in contact with the one face of the fixed board unit, equipped with a transmission microstrip line on a face coming in contact with the one face of the fixed board unit, and for providing at least one output signal by making coupling even during rotation thereof.

Abstract: Disclosed is a variable phase shifter, the variable phase shifter including: a fixed board which is fixedly provided in a housing, and consisting of a dielectric board, and consisting of a dielectric board, having a second transfer stripline having at least one arc-shaped output micro stripline on one surface; a rotating board rotatably provided within the housing while coming in contact with the one surface of the fixed board, and consisting of a dielectric board, having a second transfer stripline coupled to the arc-shaped output micro stripline on a surface where the rotating board comes in contact with the one surface of the fixed board even when the rotating board rotates; wherein both the sides of at least one output micro stripline of the fixed board are connected to an output port, and the other surface of the fixed board includes an input micro stripline, so that the other surface of the fixed board is electrically connected and receives an input signal.

Abstract: The present invention provides a collision in right/left turn prevention system which can automatically stop a vehicle even when a driver of the vehicle can not correctly grasp a course of a vehicle running in the counter direction because of the road line form or because the counter vehicle is hid behind other vehicles, or when a velocity of the counter vehicle is faster than that estimated by the driver.

Abstract: A system-enabled vehicle entering a crossing warns a driver of the vehicle that a possibility of bumping exists, thereby allowing the driver to brake and stop the vehicle in an emergency in front of the crossing. When the system determines a possibility of bumping with another vehicle entering the crossing exists, the system continuously provides controls for decelerating and stopping the vehicle in a range from a point where the system can decelerate the vehicle in an emergency with time allowance for stopping the vehicle in front of the crossing up to a point in front of the crossing.

Abstract: The collision with pedestrian prevention system according to the present invention comprises pedestrian detection means, road surface conditions detection means, road information accumulation means, vehicle position detection means, vehicle state detection means, processing means, information output means, and vehicle control means. Because of the configuration, the driver is alerted the presence of any pedestrian on a pedestrian's crossing and can immediately correct operations for handling the vehicle without being perplexed by the information just about to finish crossing the road. This system works only when there is the possibility of collision between a pedestrian on a pedestrian's crossing and a vehicle, and provides automatic controls for decelerating or stopping the vehicle when the driver can stop the vehicle by emergently braking over a distance from the vehicle to the pedestrian's crossing.

Abstract: Maintenance information is collected by a sensor on an electric power cable installed in a manhole. The information is transmitted to a radio transmitter which is positioned in a vicinity of a bottom plane of an inner lid in an opening of the manhole. The information is transmitted by the radio transmitter, and received by a receiving antenna mounted on a bottom plane of the inner lid. On a top plane of the inner lid, an electrode, a connecting lead or a transmitting antenna is provided to be connected to the receiving antenna by an impedance matching circuit. The information is supplied to an outer lid in the opening of the manhole by the opening of the manhole by the electrode using a spatial coupling capacitance relative to the outer lid, or the connecting lead directly connected to the outer lid. Thus, the information is transmitted as a radio signal by the outer lid functioning as an antenna. Otherwise, the information is radiated below the outer lid by the transmitting antenna.