Abstract:
There is disclosed a half-wavelength (λ/2) resonator which is constituted of a micro strip line or a strip line and in which line pattern portions are disposed symmetrically with respect to a reference line, connected to each other to form an L shape, and formed in an open loop shape so as to have open ends. For one pair of line pattern portions having the open ends, base portions connected to adjacent line pattern portions are disposed in the vicinity of the reference line, and the open ends are extended in opposite directions so that the ends are disposed apart from the reference line.
Abstract:
A filter circuit includes a first resonator and a second resonator each having a different resonance frequency. The first resonator is included in a first block, and the second resonator is included in a second block. The first block further includes a first delay unit connected to the first resonator. An input terminal divides an input signal to the first block and the second block. An output terminal combines signals passing through the first block and the second block and outputs the combined signal. The first delay unit converts a phase difference between the signals passing through the first block and the second block to reverse-phase or nearly reverse-phase.
Abstract:
A superconductor filter includes a superconductor receiver filter of a planar transmission line structure including a signal input line, a resonator element and a signal output line and configured to select a signal received from an antenna, a superconductor transmitter filter of a planar transmission line structure including a signal input line, a resonator element and a signal output line and configured to select a signal transmitted to the antenna, the transmitter filter being arranged non-parallel to the receiver filter, and a heat-insulating container housing the superconductor receiver filter and the superconductor transmitter filter.
Abstract:
A refrigeration device of an embodiment includes: a heat-insulating vacuum chamber; a refrigerator cryogenic unit that is provided in the heat-insulating vacuum chamber and is cooled to a lower temperature than 195 K; a catalytic electrode that is provided in the heat-insulating vacuum chamber and contains a transition metal at least in part of a surface thereof; a power supply that applies a voltage to the catalytic electrode; and a heating unit that is provided in the heat-insulating vacuum chamber and heats the catalytic electrode. In this refrigeration device, the catalytic electrode is insulated from the heat-insulating vacuum chamber and the heating unit, and the heating unit is insulated from the heat-insulating vacuum chamber and the catalytic electrode.
Abstract:
According to one embodiment, a magnetic resonance measuring apparatus includes a signal source, a transmitter, a receiver, a bandpass filter, a receiving circuit and a magnetic field generator. The signal generator is configured to generate a microwave signal. The transmitter is configured to transmit the signal from the signal source to a test sample. The receiver is opposed to the transmitter and configured to receive the signal from the transmitter via the sample. The bandpass filter has a bandwidth and is configured to extract the signal. The receiving circuit is configured to amplify the extracted signal through the bandpass filter and process the amplified signal. The magnetic field generator is configured to apply a magnetic field to the sample. The bandwidth satisfies a condition, P+Gtx+Grx−(Γtx+Γd1+Γd2+Γd3+Γrx)>10×log(k×T×BW×109).
Abstract:
One embodiment of a high-frequency filter includes a band-rejection filter including a plurality of reflection-type resonance elements and a filter circuit element provided between the reflection-type resonance elements, wherein an electrical length between the reflection-type resonance elements between which the filter circuit element is provided is an odd multiple of 90 degrees in a rejection band of the band-rejection filter.
Abstract:
A control apparatus for a rotary machine, comprising a variable-voltage variable frequency (VVVF) inverter for driving the rotary machine, a voltage detector for detecting a DC voltage at the inverter's input, current detectors for detecting phase currents of the rotary machine, an inverter-electric-power command unit for determining an inverter-electric-power command value, an actual-inverter-electric-power calculation unit for calculating an actual inverter-electric-power value, a secondary-magnetic-flux command calculation unit for calculating a secondary-magnetic-flux command value, a predetermined-secondary-magnetic-flux command unit for outputting a predetermined secondary-magnetic-flux command value, and a secondary-magnetic-flux command changeover unit for selecting either one of the secondary-magnetic-flux command value and the predetermined secondary-magnetic-flux command value as a secondary-magnetic-flux command value which is used to control the rotary machine.
Abstract:
According to an aspect of the present invention, there is provided a resonator including: a transmission line including a conductor line with a bent portion, wherein the conductor line has a plurality of slits formed therein, the slits being formed in an extending direction of the conductor line to pass through the bent portion, and wherein the slits are formed to have intervals that become narrower from an outer-side toward an inner-side of the bent portion.
Abstract:
A filter circuit includes an input terminal configured to input an input signal; first to ith blocks which have first to ith resonators as transmission lines having first to ith resonance frequencies; a power divider configured to distribute the input signal to the first to ith blocks; a power combiner configured to combine signals which have passed through the first to ith blocks to obtain a combined signal; and an output terminal configured to output the combined signal, wherein a jth block includes a phase adjustment unit which provides a signal of the jth block with a phase difference within a range of {(180±30)+(360×n)} degrees from a signal of a (j+1)th block, and a resonator having a large amount of group delay has a greater line width than a resonator having a small amount of group delay.
Abstract:
A control apparatus for an AC rotary machine, comprising a VVVF inverter 1 which exchanges electric power between it and the AC rotary machine, a voltage detector 16 which detects voltage information of a DC side of the inverter 1, current detectors 3 which detect current information items of an AC side of the inverter 1, an inverter-electric-power command unit 20 which determines an inverter-electric-power command value in accordance with the detected voltage information, an actual-inverter-electric-power calculation unit 19 which calculates an actual inverter-electric-power value on the basis of the detected current information items, a secondary-magnetic-flux command calculation unit 18 which calculates a secondary-magnetic-flux command value for the AC rotary machine, on the basis of a difference between the inverter-electric-power command value and the actual inverter-electric-power value, a-predetermined-secondary-magnetic-flux command unit 23 which outputs a predetermined secondary-magnetic-flux command value for the AC rotary machine, and a secondary-magnetic-flux command changeover unit 24 which selects either of the secondary-magnetic-flux command value from the secondary-magnetic-flux command calculation unit 18 and the predetermined secondary-magnetic-flux command value from the predetermined-secondary-magnetic-flux command unit 23, as a secondary-magnetic-flux command value which is used for controlling the rotary machine through the inverter 1.