Abstract: An electronic apparatus includes a metal base; a wiring board disposed on the metal base, the wiring board having an opening and including interconnects; a metal stage dispose in the opening, the metal stage serving as a ground line; and a semiconductor device disposed on the metal stage, wherein an area of an end surface of the metal stage facing the metal base is larger than that of the metal stage facing the semiconductor device.

Abstract: A filter includes: an input terminal to which a fundamental wave signal and a harmonic signal group of the fundamental wave signal are supplied; an output terminal configured to output the fundamental wave signal supplied to the input terminal; a transmission line configured to connect the input terminal and the output terminal; an open-end stub configured to be provided corresponding to an odd harmonic signal among the harmonic signal group, coupled to the transmission line, and has a length corresponding to one quarter of a wavelength of the corresponding odd harmonic signal; a first short-end stub configured to be coupled to the transmission line and has a length corresponding to one quarter of a wavelength of the fundamental wave signal; and a second short-end stub configured to be coupled to the transmission line.

Abstract: A superconductive filter includes a superconductive filter substrate having a dielectric substrate and a plurality of resonator patterns formed on a surface of the dielectric substrate, the plurality of resonator patterns including a superconductive material; a package accommodating the superconductive filter substrate; and an intermediate substrate disposed between an inner surface of the package and the superconductive filter substrate, and thermally coupling the package and the superconductive filter substrate wherein a difference between a degree of contraction of the intermediate substrate and the degree of contraction of the dielectric substrate is smaller than a difference between the degree of contraction of the dielectric substrate and the degree of contraction of the package, when the package, the intermediate substrate, and the dielectric substrate are cooled from room temperature to a critical temperature of the resonator patterns.

Abstract: A filter includes a dielectric substrate; an electrode layer continuously formed covering a first side of the dielectric substrate; a disk-shaped electrode pattern provided on a second side of the dielectric substrate, the disk-shaped electrode pattern and the electrode layer holding the dielectric substrate therebetween; a ground slot having an opening that is formed asymmetrically with respect to the center of a circular area included in the electrode layer and exposes the dielectric substrate, the circular area and the disk-shaped electrode pattern holding the dielectric substrate therebetween.

Abstract: The coaxial connector 10 to be connected with a coaxial cable has a surface covering layer 20 formed of a metal material which causes an eutectic reaction with In on the surface of a terminal 12 which is a core conductor. Because of the surface covering layer 20 of a metal material which causes the eutectic reaction with In formed on the surface of the terminal of the coaxial connector, the terminal of the coaxial connector and the electrode of a superconductor device can be jointed to each other by the solder layer of In-based solder at a relatively low temperature. Thus, the discharge of oxygen from the inside of the superconductor film of a superconductor filter can be suppressed, and the decrease of the critical temperature TC can be suppressed.

Abstract: A three-dimensional filter includes a pair of superconductor films opposed to each other, and a three-dimensional resonator made of dielectric and situated between the superconductor films, wherein one of the superconductor films is movable relative to the three-dimensional resonator.

Abstract: An electronic apparatus includes a metal base; a wiring board disposed on the metal base, the wiring board having an opening and including interconnects; a metal stage dispose in the opening, the metal stage serving as a ground line; and a semiconductor device disposed on the metal stage, wherein an area of an end surface of the metal stage facing the metal base is larger than that of the metal stage facing the semiconductor device.

Abstract: In a wall of a package base made of aluminum or aluminum alloy, there is formed a through-hole, through which a semi-rigid coaxial cable passes. A central conductor of the semi-rigid coaxial cable is joined to an electrode with a solder material. The semi-rigid coaxial cable has an insulating material through which the central conductor passes and an outer conductor provided therearound. The central conductor and outer conductor are made of stainless steel, for example, and the insulating material is made of fluororesin, for example. Inside the through-hole, the wall of the package base and the outer conductor are electrically connected to each other via a stainless material within the hole formed in a cylindrical fluororesin material. The semi-rigid coaxial cable and the like are fixed to the wall with a conductive screw.

Abstract: A resonance pattern (21) made of conductive material and having a circular plan shape is formed over the principal surface of a dielectric substrate. First and second virtual straight lines mutually crossing at a right angle are defined. A first input port (22) and a first output port (23) are electromagnetically coupled to the resonance pattern at two cross points between the first virtual straight line and an outer circumference line of the resonance pattern. A second input port (24) and a second output port (25) are electromagnetically coupled to the resonance pattern at two cross points between the second virtual straight line and the outer circumference line of the resonance pattern. A first inter-port waveguide (26) propagates a high frequency signal output to the first output port to the second input port.

Abstract: A filter includes: an input terminal to which a fundamental wave signal and a harmonic signal group of the fundamental wave signal are supplied; an output terminal configured to output the fundamental wave signal supplied to the input terminal; a transmission line configured to connect the input terminal and the output terminal; an open-end stub configured to be provided corresponding to an odd harmonic signal among the harmonic signal group, coupled to the transmission line, and has a length corresponding to one quarter of a wavelength of the corresponding odd harmonic signal; a first short-end stub configured to be coupled to the transmission line and has a length corresponding to one quarter of a wavelength of the fundamental wave signal; and a second short-end stub configured to be coupled to the transmission line.

Abstract: A resonance pattern (21) made of conductive material and having a circular plan shape is formed over the principal surface of a dielectric substrate. First and second virtual straight lines mutually crossing at a right angle are defined. A first input port (22) and a first output port (23) are electromagnetically coupled to the resonance pattern at two cross points between the first virtual straight line and an outer circumference line of the resonance pattern. A second input port (24) and a second output port (25) are electromagnetically coupled to the resonance pattern at two cross points between the second virtual straight line and the outer circumference line of the resonance pattern. A first inter-port waveguide (26) propagates a high frequency signal output to the first output port to the second input port.

Abstract: A dual-mode filter capable of providing a high degree of design freedom and/or tunability is disclosed. The dual-mode filter includes a ring resonator; an input feeder and an output feeder disposed substantially orthogonal with respect to each other and with respect to the ring resonator so as to be electromagnetically coupled to the ring resonator; and a dual-mode generating line disposed inside the ring resonator in a manner so that the dual-mode generating line does not overlap with a line extending from the input feeder or a line extending from the output feeder.

Abstract: A superconducting device comprises a dielectric substrate, and a plane-figure type resonator pattern made of a superconductive material and formed on a first face of the dielectric substrate. The resonator pattern has a notch at least a portion of which is round.

Abstract: A superconductive device that includes a ground film made of the superconductive material, wherein part of the ground film has an opening pattern.

Abstract: A superconductive filter includes a superconductive filter substrate having a dielectric substrate and a plurality of resonator patterns formed on a surface of the dielectric substrate, the plurality of resonator patterns including a superconductive material; a package accommodating the superconductive filter substrate; and an intermediate substrate disposed between an inner surface of the package and the superconductive filter substrate, and thermally coupling the package and the superconductive filter substrate wherein a difference between a degree of contraction of the intermediate substrate and the degree of contraction of the dielectric substrate is smaller than a difference between the degree of contraction of the dielectric substrate and the degree of contraction of the package, when the package, the intermediate substrate, and the dielectric substrate are cooled from room temperature to a critical temperature of the resonator patterns.

Abstract: The wireless communication system sets at least one of the multiple wireless frequencies as a reception frequency from the wireless tag, and controls the temperature of a superconducting filter in response to the selected reception frequency, thereby the pass band or the rejection band of the superconducting filter is controlled.

Abstract: A resonator pattern made of superconductive material is disposed over a first surface of a base substrate made of dielectric. An adjustment substrate made of dielectric is disposed facing the first surface at a distance from the first surface. The adjustment substrate is supported by a support mechanism for supporting the adjustment substrate in such a manner capable of changing an angle between the first surface and a surface of the adjustment substrate facing the base substrate. A superconductive filter is provided which can shift a center frequency of a filter band and suppress disturbance of a waveform of a filter characteristic, with a simple method.

Abstract: A filter includes a dielectric substrate; an electrode layer continuously formed covering a first side of the dielectric substrate; a disk-shaped electrode pattern provided on a second side of the dielectric substrate, the disk-shaped electrode pattern and the electrode layer holding the dielectric substrate therebetween; a ground slot having an opening that is formed asymmetrically with respect to the center of a circular area included in the electrode layer and exposes the dielectric substrate, the circular area and the disk-shaped electrode pattern holding the dielectric substrate therebetween.

Abstract: A three-dimensional filter includes a pair of superconductor films opposed to each other, and a three-dimensional resonator made of dielectric and situated between the superconductor films, wherein one of the superconductor films is movable relative to the three-dimensional resonator.

Abstract: A superconducting device comprises a dielectric substrate, and a plane-figure type resonator pattern made of a superconductive material and formed on a first face of the dielectric substrate. The resonator pattern has a notch at least a portion of which is round.