Abstract: According to an embodiment, a control apparatus includes a shaper and a compensator. The shaper receives a first target value in position control of a controlled object and generates a second target value which changes substantially rampwise over a time equal to or shorter than a period corresponding to one of resonance frequencies of the controlled object until the second target value becomes equal the first target value. The compensator compensates for a control signal, used for controlling the controlled object, based on the second target value.

Abstract: According to an embodiment, a filter characteristic tuning apparatus includes a characteristic tuning member, an elastic member, a first movable member, a second movable member, and a driving mechanism. The elastic member comes in contact with a characteristic tuning member by deformation, and separates from the characteristic tuning member by a restoring force. The first movable member deforms the elastic member in a closing operation. The driving mechanism displaces a second movable member such that a projection opens/closes the first movable member. The characteristic tuning member changes a gap between the characteristic tuning member and the resonator by a linear driving force obtained by converting the transmitted rotary driving force.

Abstract: A filter according to embodiments includes n resonators, an input line, and an output line. Each of the resonators includes a first comb-like structure, a second comb-like structure, and a connection line that connect the first and the second comb-like structure. The first and second comb-like structures have a plurality of first lines and a second line that is connected to one end of the first lines. The first lines of the first and the second comb-like structures are arranged parallel to each other. The connection line has bending portions. Further, a second comb-like structure of a k-th resonator and a first comb-like structure of a (k+1)-th resonator are arranged so as to have an interlaced arrangement, and a second comb-like structure of the (k+1)-th resonator and a first comb-like structure of a (k+2)-th resonator are arranged so as to have an interlaced arrangement.

Abstract: According to one embodiment, a multiband filter includes a first resonator and a second resonator. The first resonator has a first capacitive component and a first inductive component. A signal of a first frequency is inputted to the first resonator. The second resonator has a second capacitive component and a second inductive component. A signal of a second frequency is inputted to the second resonator. The second frequency is different from the first frequency. A distance between a first capacitive component of the first resonator and a second capacitive component of the second resonator and a distance between a first inductive component of the first resonator and a second inductive component of the second resonator is longer than a shortest distance out of a distance between the first resonator and the second resonator. The capacitive components occur at the capacitance. The inductive components occur at the inductance.

Abstract: According to one embodiment, a superconducting member includes a superconducting layer, a foundation layer, and an intermediate layer. The superconducting layer is made of an oxide including Cu and Ba. The foundation layer is made of cerium oxide. The intermediate layer is provided between the foundation layer and the superconducting layer, and is made of BaxCayCeO3 (0.6<x<0.8 and 0.2<y<0.4).

Abstract: A superconducting antenna device of an embodiment includes an array antenna made by stacking a flat antenna having one or more antennas made of a superconducting material and a ground pattern on a low-loss dielectric substrate from a short wave band to an extremely-high frequency band, a vacuum chamber configured to accommodate the array antenna, a refrigerator configured to cool the array antenna, and a vacuum insulating window configured to pass an electromagnetic wave from a short wave band to an extremely-high frequency band in a direction of directivity of the array antenna in the vacuum chamber.

Abstract: According to one embodiment, an array antenna apparatus includes a distributor, transmission phase shifters, transmission amplifiers, transmission filters, transmission/reception switches, limiters, reception filters, low-noise amplifiers, reception phase shifters, a combiner, a vacuum vessel, a refrigerating unit, and a cooling plate.

Abstract: A magnetic resonance imaging apparatus of an embodiment includes a housing, a static magnetic field source having a superconducting coil or a permanent magnet inside the housing, and a superconducting array antenna inside the housing.

Abstract: A superconducting antenna device of an embodiment includes an array antenna made by stacking a flat antenna having one or more antennas made of a superconducting material and a ground pattern on a low-loss dielectric substrate from a short wave band to an extremely-high frequency band, a vacuum chamber configured to accommodate the array antenna, a refrigerator configured to cool the array antenna, and a vacuum insulating window configured to pass an electromagnetic wave from a short wave band to an extremely-high frequency band in a direction of directivity of the array antenna in the vacuum chamber.

Abstract: A superconducting filter device of an embodiment includes: a high-frequency filter includes a superconducting element, and a dielectric member; and a drive tool configured to adjust a distance between the superconducting element and the dielectric member. The dielectric member and the drive tool take both a connection state and a separation state.

Abstract: A resonance element according to an embodiment transmits a radio-frequency signal, and includes a first substrate, a second substrate, a first circuit element formed on the first substrate, a second circuit element formed on the second substrate, and a transmission line connecting the first circuit element and the second circuit element, and a peak of even mode resonance in which the first circuit element and the second circuit element resonate in the same phase is within a bandwidth of a transmission signal, and a peak of odd mode resonance in which the first circuit element and the second circuit element resonate in a reverse phase is outside the bandwidth.

Abstract: A filter according to embodiments includes n resonators, an input line, and an output line. Each of the resonators includes a first comb-like structure, a second comb-like structure, and a connection line that connect the first and the second comb-like structure. The first and second comb-like structures have a plurality of first lines and a second line that is connected to one end of the first lines. The first lines of the first and the second comb-like structures are arranged parallel to each other. The connection line has bending portions. Further, a second comb-like structure of a k-th resonator and a first comb-like structure of a (k+1)-th resonator are arranged so as to have an interlaced arrangement, and a second comb-like structure of the (k+1)-th resonator and a first comb-like structure of a (k+2)-th resonator are arranged so as to have an interlaced arrangement.

Abstract: A heat insulating transmission line includes a first waveguide with a first aperture end, a second waveguide with a second aperture end, and a reflector. The second waveguide is arranged coaxially with the first waveguide. The second aperture end faces the first aperture end through an air gap. The reflector is provided outside the air gap, and controls radiation power from the air gap. In addition, the reflector is substantially parallel to a portion of a virtual plane connecting an inner wall of the first aperture end of the first waveguide and an inner wall of the second aperture end of the second waveguide. When a mean frequency of a signal transmitting through the heat insulating transmission line is expressed as ?, a distance between the virtual surface and the reflector is not less than N×?/2?0.05? and not more than N×?/2+0.2? (N is a positive integer).

Abstract: A heat insulating transmission line includes a first waveguide with a first aperture end, a second waveguide with a second aperture end, and a reflector. The second waveguide is arranged coaxially with the first waveguide. The second aperture end faces the first aperture end through an air gap. The reflector is provided outside the air gap, and controls radiation power from the air gap. In addition, the reflector is substantially parallel to a portion of a virtual plane connecting an inner wall of the first aperture end of the first waveguide and an inner wall of the second aperture end of the second waveguide. When a mean frequency of a signal transmitting through the heat insulating transmission line is expressed as ?, a distance between the virtual surface and the reflector is not less than N×?/2?0.05? and not more than N×?/2+0.2? (N is a positive integer).

Abstract: A heat insulating transmission line includes a first waveguide with a first aperture end, a second waveguide with a second aperture end, and a reflector. The second waveguide is arranged coaxially with the first waveguide. The second aperture end faces the first aperture end through an air gap. The reflector is provided outside the air gap, and controls radiation power from the air gap. In addition, the reflector is substantially parallel to a portion of a virtual plane connecting an inner wall of the first aperture end of the first waveguide and an inner wall of the second aperture end of the second waveguide. When a mean frequency of a signal transmitting through the heat insulating transmission line is expressed as ?, a distance between the virtual surface and the reflector is not less than N×?/2?0.05? and not more than N×?/2+0.2? (N is a positive integer).

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 resonance element according to an embodiment transmits a radio-frequency signal, and includes a first substrate, a second substrate, a first circuit element formed on the first substrate, a second circuit element formed on the second substrate, and a transmission line connecting the first circuit element and the second circuit element, and a peak of even mode resonance in which the first circuit element and the second circuit element resonate in the coordinated phase is within a bandwidth of a transmission signal, and a peak of odd mode resonance in which the first circuit element and the second circuit element resonate in a reverse phase is outside the bandwidth.

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: The present invention provides a filter circuit that can achieve both sharp bandpass characteristics and high power handling capability. The filter circuit includes: an input terminal that has a signal input; a four-port device that divides input signals; a band stop filter that has the center frequency of the input signals within the stopband, and causes the out-of-stopband signals among the input signals to pass; two bandstop resonators circuits that cause the signals passing through the band stop filters to pass, and reflect the signals; open ends that are connected in parallel to the two bandstop resonators circuits; and an output terminal that outputs the signals reflected by the band stop filters and the bandstop resonators circuits and combined at the four-port device.

Abstract: In resonant elements 102 to 105 constituting a resonant circuit, an uncontrolled cross coupling which exists between two resonant elements is controlled by using a coupling element 106 which is newly arranged between the resonant elements, whereby it is possible to create a state where two resonant elements are not coupled with each other or a state where the amount of the coupling is reduced, which states are difficult to be realized on a plane. As a result, it is possible to improve characteristics of a planar filter.