Abstract: An antenna device includes an impedance converter circuit connected to a feeder circuit, an impedance-conversion-ratio adjustment circuit, and an antenna. The impedance converter circuit includes a first inductance element and a second inductance element, which are coupled to each other through magnetic fields, so as to provide an autotransformer circuit. The impedance-conversion-ratio adjustment circuit includes a third inductance element which is series-connected between the impedance converter circuit and an antenna port, and a capacitance element which is shunt-connected between the antenna port and ground. The impedance-conversion-ratio adjustment circuit corrects an impedance conversion ratio of the impedance converter circuit in accordance with a frequency band.

Abstract: A mobile wireless terminal includes a metal casing, a printed wiring board disposed in the metal casing and including a ground conductor thereon, the ground conductor defining a ground plane for both a power supply circuit and an antenna, a capacitor connected to the metal casing and the ground conductor, and an overcurrent protective element connected to the metal casing and the ground conductor and having an operating voltage higher than a maximum instantaneous value of a commercial power supply voltage. A capacitance of the overcurrent protective element may be smaller than a capacitance of the capacitor. The capacitor may be a multilayer ceramic capacitor, and the overcurrent protective element may be a discharge gap overcurrent protective element.

Abstract: A magnetic field coupling element includes conductor patterns stacked with insulating layers interposed therebetween, and interlayer connection conductors that inter-connect the conductor patterns at predetermined positions. The conductor patterns include first, second, third, and fourth conductor patterns, and the interlayer connection conductors include first and second interlayer connection conductors. The first conductor pattern, the second conductor pattern, and the first interlayer connection conductor define a first coil, and the third conductor pattern, the fourth conductor pattern, and the second interlayer connection conductor define a second coil. The first coil and the second coil are disposed in a region of less than about 1/3 of a stacking height of a multi-layer body including the insulating layers.

Abstract: An antenna device includes an antenna element, which is able to transmit and receive high-frequency signals of a plurality of frequency bands, and an antenna matching circuit. The antenna matching circuit includes an impedance converting circuit, which is connected to the antenna element side of the circuit, and a variable reactance circuit, which is connected to a feeder circuit side of the circuit. The impedance converting circuit includes a first inductance element and a second inductance element, which are transformer coupled with each other. The variable reactance circuit includes a reactance element, which is connected in parallel or series with the transmission/reception signal transmission path, and a switch that switches the connection state of the reactance element.

Abstract: An electronic device includes an antenna, and a plate-shaped heat spreader including first and second metal layers that are stacked, a working fluid in an enclosed space interposed between the first and second metal layers, and a joint along which outer peripheral portions around the enclosed space are joined. The heat spreader includes an operational region in which the enclosed space is located and a quasi-operational region other than the enclosed space. The antenna is provided in the quasi-operational region in a plan view of the heat spreader.

Abstract: A phase shifter includes a transformer including a first coil, a second coil that is magnetically coupled to the first coil, and a parasitic inductance component, and an impedance adjustment circuit including a reactance element connected to the transformer. The impedance adjustment circuit includes an input/output capacitor connected between a first port and a second port of the transformer, and the input/output capacitor is defined by an inter-coil capacitance generated between the first coil and the second coil and an input/output additional capacitor connected between the first port and the second port.

Abstract: A first end of a first conductor pattern of a first coil conductor is connected to a power supply terminal, and a second end of the first conductor pattern is connected to an antenna terminal. A second conductor pattern includes second coil conductors. A first end of the second conductor pattern is connected to the antenna terminal and the second end of the first conductor pattern, and a second end of the second conductor pattern is connected to a ground terminal. The second conductor pattern magnetically couples with the first conductor pattern. The second end of the first conductor pattern and the first end of the second conductor pattern are connected to the antenna terminal via a routing pattern that extends to magnetically couple with at least either the first conductor pattern or the second conductor pattern.

Abstract: A phase shifter module includes a base material, a common terminal, and individual terminals, the common terminal and the individual terminals being provided at the base material. Inside the base material, phase shifters that are connected between the individual terminals and the common terminal, respectively, are provided. The phase shifters each include a primary coil and a secondary coil that is coupled to the primary coil by magnetic field coupling and define a transformer phase shifter. With this configuration, a phase shifter module for use with SAW filters while reducing or preventing interference among the SAW filters, a multiplexer/demultiplexer that includes the phase shifter module, and a communication apparatus that includes the phase shifter module, are obtained.

Abstract: An antenna circuit includes a radiation conductor, a matching circuit disposed between a feeding port in the radiation conductor and a feeder circuit, and a frequency-characteristics adjusting circuit connected between a frequency-characteristics adjustment port in the radiation conductor and a ground and including a variable reactance circuit. The matching circuit includes a first inductance element connected in shunt. The frequency-characteristics adjusting circuit includes a second inductance element. The first inductance element and the second inductance element are magnetically coupled to each other.

Abstract: A phase shifter includes a transformer connected between a first port and a second port and including a first coil and a second coil that is magnetically coupled to the first coil, the transformer including a parasitic inductance component; and an impedance adjustment circuit including a reactance element that suppresses a deviation in impedance due to the parasitic inductance component of the transformer. A coupling coefficient between the first coil and the second coil of the transformer and a value of the reactance element of the impedance adjustment circuit are determined such that a phase-shift amount changes in accordance with a frequency band.

Abstract: In a laminated coil component, first coil conductor patterns define a coil opening that generates a magnetic flux in a first direction, second coil conductor patterns define a first coil opening that generates a magnetic flux in the first direction, and a second coil opening that generates a magnetic flux in a second direction. A difference in area between the first coil opening and the second coil opening determines a degree of coupling of the coil defined by the first coil conductor pattern and the coil defined by the second coil conductor pattern. This provides a close proximal arrangement of a plurality of coils proximally while significantly reducing or preventing unnecessary coupling between the coils.

Abstract: A first coil element includes a first loop-shaped conductor and a second loop-shaped conductor. A second coil element includes a third loop-shaped conductor and a fourth loop-shaped conductor. The first loop-shaped conductor and the second loop-shaped conductor are sandwiched in a stacking direction between the third loop-shaped conductor and the fourth loop-shaped conductor. A conductive pattern which is a portion of the first loop-shaped conductor and a conductive pattern which is a portion of the second loop-shaped conductor are connected in parallel. Then, each of a conductive pattern which is a remaining portion of the first loop-shaped conductor and a conductive pattern which is a remaining portion of the second loop-shaped conductor is connected in series with the parallel circuit.

Abstract: A surface-mounted LC device that includes a substrate having a first surface, multiple inductors formed on the first surface and formed respectively by multiple coiled conductor patterns, a first insulating layer covering the multiple coiled conductor patterns, and a capacitor that is formed on the first insulating layer by a planar electrode. Moreover, the planar electrode covers first zones in which portions of the coiled conductor patterns are adjacent to each other and current directions are opposite to each other in a plan view of the surface-mounted LC device.

Abstract: An antenna circuit includes a radiation conductor, a matching circuit disposed between a feeding port in the radiation conductor and a feeder circuit, and a frequency-characteristics adjusting circuit connected between a frequency-characteristics adjustment port in the radiation conductor and a ground and including a variable reactance circuit. The matching circuit includes a first inductance element connected in shunt. The frequency-characteristics adjusting circuit includes a second inductance element. The first inductance element and the second inductance element are magnetically coupled to each other.

Abstract: In a spiral type acidic-gas separation module which is obtained by winding a laminate including an acidic gas separation layer that includes a facilitated transport film, a permeating gas channel member which includes a channel regulation member regulating an acidic gas channel that is a channel of an acidic gas having permeated through the facilitated transport film allows a difference in high-pressure deformation amount between a region where the channel regulation member is formed and a region other than the region to be set to 100 ?m or less. In this manner, an acidic-gas separation module which prevents damage to the facilitated transport film and exhibits a predetermined performance for a long period of time is provided.

Abstract: A coil device includes a first coil wound around a winding axis, and a second coil substantially overlapping the first coil when viewed from a winding axis direction of the first coil. The second coil includes first and second portions adjacent to each other in the winding axis direction. The first and second portions extend so that the directions of electric current flowing through the first and second portions are opposite to each other, and a coil opening is provided between the first and second portions.

Abstract: Provided is a gas separation membrane 10 including a separation layer 1 which comprises a block copolymer having at least a first segment and a second segment, in which the separation layer 1 has a phase separation structure that has at least a first structure 11 derived from the first segment and a spherical second structure 12 derived from the second segment. The gas separation membrane in which the spherical second structure satisfies Formula 1, the first structure and the spherical second structure satisfy the following Formula 2, and the first structure 11 has a structure that is continuous in the thickness direction over the entire thickness of the separation layer 1 has high gas permeability and high gas separation selectivity. Also provided is a gas separation membrane module. R/L<0.

Abstract: A mobile wireless terminal includes a metal casing, a printed wiring board disposed in the metal casing and including a ground conductor thereon, the ground conductor defining a ground plane for both a power supply circuit and an antenna, a capacitor connected to the metal casing and the ground conductor, and an overcurrent protective element connected to the metal casing and the ground conductor and having an operating voltage higher than a maximum instantaneous value of a commercial power supply voltage. A capacitance of the overcurrent protective element may be smaller than a capacitance of the capacitor. The capacitor may be a multilayer ceramic capacitor, and the overcurrent protective element may be a discharge gap overcurrent protective element.

Abstract: A phase shifter includes a transformer including a first coil, a second coil that is magnetically coupled to the first coil, and a parasitic inductance component, and an impedance adjustment circuit including a reactance element connected to the transformer. The impedance adjustment circuit includes an input/output capacitor connected between a first port and a second port of the transformer, and the input/output capacitor is defined by an inter-coil capacitance generated between the first coil and the second coil and an input/output additional capacitor connected between the first port and the second port.

Abstract: Coil openings of a primary side coil element of a first transformer, a secondary side coil element of the first transformer, a primary side coil element of a second transformer, and a secondary side coil element of the second transformer overlap with one another when viewed from above in a lamination direction. The primary side coil element of the first transformer and the primary side coil element of the second transformer are connected in parallel, and the secondary side coil element of the first transformer and the secondary side coil element of the second transformer are connected in parallel. An impedance conversion ratio is defined in accordance with a lamination order of the primary side coil element and the secondary side coil element of the first transformer with respect to a lamination order of the primary side coil element and the secondary side coil element of the second transformer within a multilayer body.