Abstract: During a switch from a first state in which a transport vehicle is connected to a first access point in a first access point group to a second state in which the transport vehicle is connected to a second access point in a second access point group, or a switch from the second state to the first state, an upper-level controller executes network segment switching processing including restarting a communication controller and a protocol stack, while maintaining a physical layer device in an active state.

Abstract: During a switch from a first state in which a transport vehicle is connected to a first access point in a first access point group to a second state in which the transport vehicle is connected to a second access point in a second access point group, or a switch from the second state to the first state, an upper-level controller executes network segment switching processing including restarting a communication controller and a protocol stack, while maintaining a physical layer device in an active state.

Abstract: A connector of the present invention comprises a jack socket with a plurality of first terminals disposed at a cylindrical inner wall at predetermined intervals in a depth direction, a plug with a plurality of second terminals disposed at an outer wall thereof, constituting a plurality of electrical contacts by individually making contact with each of the first terminals in a state of insertion into the jack socket, and ring-shaped elastic seal members that seal each of the electrical contacts when the plug is inserted in the jack socket.

Abstract: A connector of the present invention comprises a jack socket with a plurality of first terminals disposed at a cylindrical inner wall at predetermined intervals in a depth direction, a plug with a plurality of second terminals disposed at an outer wall thereof, constituting a plurality of electrical contacts by individually making contact with each of the first terminals in a state of insertion into the jack socket, and ring-shaped elastic seal members that seal each of the electrical contacts when the plug is inserted in the jack socket.

Abstract: A microwave oscillator includes a transistor for oscillation, an insulating substrate on which the transistor is mounted, a first strip conductor which is attached to the insulating substrate and which has one end connected to the output terminal of the transistor, and a second strip conductor which is attached to the insulating substrate and which has one end connected to input terminal of the transistor. The microwave oscillator further includes a TE01-mode dielectric resonator which couples with the first strip conductor and the second strip conductor, and a varactor diode. The varactor diode has one end connected to the other end of the first strip conductor or the other end of the second strip conductor, and the other end is RF-grounded, such that the capacitance of the varactor diode can be changed.

Abstract: A radio frequency amplifier includes a waveguide filter positioned between a first and a second amplifier circuit, which reduces the distortion between the amplifier circuits. The waveguide includes a main body having a cavity.

Abstract: A satellite-broadcasting receiving converter includes a plurality of output terminals each of which is connected to an external receiver, to each of which a selection control voltage in which a high-frequency voltage is superposed on a DC voltage is sent from the external receiver, and from each of which one type of a receiving signal is selected according to the selection control voltage and output; and a regulator for generating a power-source voltage from the selection control voltage. Since a high-frequency attenuation unit is connected in series between each output terminal and the regulator in the satellite-broadcasting receiving converter, even if a plurality of selection control voltages are input in common to the regulator, the plurality of selection control voltages different from each other do not affect each other and thereby only one regulator is required.

Abstract: There are provided a voltage-controlled oscillator whose oscillation frequency is controlled by a control voltage, a reference oscillator, and a sampling phase detector for receiving an oscillation signal of the voltage-controlled oscillator and a reference oscillation signal of the reference oscillator and for inputting, to the voltage-controlled oscillator, as the control voltage, an error voltage that is obtained on the basis of a phase difference between the oscillation signal and a harmonic of the reference oscillation signal. An irreversible circuit element is provided between the voltage-controlled oscillator and the sampling phase detector. The oscillation signal that is output from the voltage-controlled oscillator is input to the sampling phase detector via the irreversible circuit element.

Abstract: A microwave oscillator includes a transistor for oscillation, an insulating substrate on which the transistor is mounted, a first strip conductor which is attached to the insulating substrate and which has one end connected to the output terminal of the transistor, and a second strip conductor which is attached to the insulating substrate and which has one end connected to input terminal of the transistor. The microwave oscillator further includes a TE01-mode dielectric resonator which couples with the first strip conductor and the second strip conductor, and a varactor diode. The varactor diode has one end connected to the other end of the first strip conductor or the other end of the second strip conductor, and the other end is RF-grounded, such that the capacitance of the varactor diode can be changed.

Abstract: A radio frequency amplifier includes a waveguide filter positioned between a first and a second amplifier circuit, which reduces the distortion between the amplifier circuits. The waveguide includes a main body having a cavity.

Abstract: According to the present invention, there is provided a satellite broadcast receiving converter which comprises a waveguide in which the broadcast wave travelling therein travels as a first TE11 mode linearly polarized wave and as a second TE mode linearly polarized wave intersecting at a right angle with each other, a first probe disposed at a predetermined position within this waveguide for detecting the first linearly polarized wave, a first reflecting conductor disposed approximately 1/4 of the wavelength separate from the first probe in the direction in which the electric wave travels for reflecting the first linearly polarized wave, a second probe disposed in the neighborhood of the first reflecting conductor for detecting the second linearly polarized wave, and a second reflecting conductor disposed approximately 1/4 of the wavelength from the second probe in the direction in which the electric wave travels for reflecting the second linearly polarized wave.

Abstract: An outdoor satellite broadcast receiving converter including a waveguide into which a broadcast electric wave enters and in which the broadcast electric wave travels in an axial direction as a first linearly polarized wave and a second linearly polarized wave. A first probe is disposed at a predetermined position and extends perpendicular to the axial direction into the waveguide for detecting the first linearly polarized wave. A substrate is disposed in the waveguide approximately 1/4 wavelength from the first probe and arranged to extend across an open end of the waveguide. A first shorting terminal for reflecting the first linearly polarized wave is formed on a first side of the substrate, and a second probe for detecting the second linearly polarized wave is formed on an opposing second side of the substrate. A metallic case is connected over the open end of the waveguide such that the substrate is positioned between a closed bottom of the metallic case and the first probe.