Abstract: A multilayer substrate includes a base body including a first main surface, a first external electrode provided on the first main surface and made of metal foil, a first interlayer connection conductor, and a second interlayer connection conductor having higher conductivity than the first interlayer connection conductor. The base body includes insulating base material layers that are stacked on one another. The first interlayer connection conductor is provided at least in an insulating base material layer on which the first external electrode is provided, and is connected to the first external electrode. The second interlayer connection conductor is disposed inside the base body, and is connected to the first external electrode through the first interlayer connection conductor.

Abstract: A transmission line substrate includes a stacked body that includes insulating base materials, first and second signal lines, and first and second ground conductors. The second signal line is provided on a layer different from the layer of the first signal line and extends in parallel with the first signal line. The first ground conductor is provided on the same layer as the layer of the second signal line and overlapped with the first signal line when viewed in the Z-axis direction. The second ground conductor is provided on the same layer as the layer of the first signal line and overlapped with the second signal line when viewed in the Z-axis direction. A first transmission line includes the first signal line, the first ground conductor, and an insulating base material, and a second transmission line includes the second signal line, the second ground conductor, and the insulating base material.

Abstract: A transmission line includes first, second, third, and fourth signal lines, and first, second, third, and fourth electrode pads respectively connected thereto. A first main surface of an external connection portion includes a first region in which the first electrode pad and the second electrode pad are provided, and a second region in which the third electrode pad and the fourth electrode pad are provided. Each of the first electrode pad and the second electrode pad, in a plan view, is surrounded by a ground electrode, and at least one of the third electrode pad and the fourth electrode pad, in the plan view, includes a portion that is not surrounded by the ground electrode.

Abstract: A transmission line substrate includes a line portion, a base including a first main surface and a second main surface opposite to the first main surface, first and second ground conductors, and a signal line. The first ground conductor is on the first main surface side. The second ground conductor is on the second main surface side. The first ground conductor includes first conductor-non-formed portions overlapping the signal line when viewed in the Z axis direction. The second ground conductor includes second conductor-non-formed portions overlapping the signal line when viewed in the Z axis direction. A total area of the second conductor-non-formed portions is less than a total area of the first conductor-non-formed portions.

Abstract: A resin multilayer substrate includes a plurality of insulating resin base material layers and a plurality of conductor patterns provided on the plurality of insulating resin base material layers. The plurality of conductor patterns include a signal line and a ground conductor overlapping the signal line as viewed from a laminating direction of the insulating resin base material layers. A plurality of openings are provided in the ground conductor, and an aperture ratio is higher in a zone far from the signal line than in a zone adjacent to or in a vicinity of the signal line in a direction perpendicular or substantially perpendicular to the laminating direction.

Abstract: A multilayer wiring board includes a first insulating layer, a second insulating layer stacked on the first insulating layer, a via conductor inside each of the first insulating layer and the second insulating layer, and a conductive bonding layer that bonds the via conductors to each other. The first insulating layer is directly bonded to the second insulating layer, and a relationship a1>b1 is satisfied, where a1 is a maximum diameter of the bonding layer and b1 is a maximum diameter of the via conductor at an interface with the bonding layer.

Abstract: A resin multilayer substrate includes a plurality of insulating resin base material layers and a plurality of conductor patterns provided on the plurality of insulating resin base material layers. The plurality of conductor patterns include a plurality of signal lines provided at positions not overlapping each other as viewed from a laminating direction of the insulating resin base material layers, and a ground conductor overlapping the plurality of the signal lines as viewed from the laminating direction. Openings are provided in the ground conductor and, as viewed from the laminating direction, an aperture ratio is higher in an inner zone that is sandwiched between two signal lines than in an outer zone of the two signal lines.

Abstract: A multilayer substrate includes a base body including a first main surface, a first external electrode provided on the first main surface and made of metal foil, a first interlayer connection conductor, and a second interlayer connection conductor having higher conductivity than the first interlayer connection conductor. The base body includes insulating base material layers that are stacked on one another. The first interlayer connection conductor is provided at least in an insulating base material layer on which the first external electrode is provided, and is connected to the first external electrode. The second interlayer connection conductor is disposed inside the base body, and is connected to the first external electrode through the first interlayer connection conductor.

Abstract: An interposer includes a stacked body including insulating base material layers that are stacked on one another, first and second electrodes, a conductor pattern, and an interlayer connection conductor. The stacked body includes a first mounting surface including a first electrode, and a second mounting surface facing the first mounting surface and including a second electrode. The first electrode is electrically connected to the second electrode through the conductor pattern and the interlayer connection conductor. A length of an electrical path including conductor patterns connecting the first electrode and the second electrode is larger than a total length of the interlayer connection conductor in a stacking direction.

Abstract: A transmission line substrate includes a stacked body that includes insulating base materials, first and second signal lines, and first and second ground conductors. The second signal line is provided on a layer different from the layer of the first signal line and extends in parallel with the first signal line. The first ground conductor is provided on the same layer as the layer of the second signal line and overlapped with the first signal line when viewed in the Z-axis direction. The second ground conductor is provided on the same layer as the layer of the first signal line and overlapped with the second signal line when viewed in the Z-axis direction. A first transmission line includes the first signal line, the first ground conductor, and an insulating base material, and a second transmission line includes the second signal line, the second ground conductor, and the insulating base material.

Abstract: A multilayer substrate includes a base body including a first main surface, a first external electrode provided on the first main surface and made of metal foil, a first interlayer connection conductor, and a second interlayer connection conductor having higher conductivity than the first interlayer connection conductor. The base body includes insulating base material layers that are stacked on one another. The first interlayer connection conductor is provided at least in an insulating base material layer on which the first external electrode is provided, and is connected to the first external electrode. The second interlayer connection conductor is disposed inside the base body, and is connected to the first external electrode through the first interlayer connection conductor.

Abstract: A transmission line substrate includes a stacked body that includes insulating base materials, first and second signal lines, and first and second ground conductors. The second signal line is provided on a layer different from the layer of the first signal line and extends in parallel with the first signal line. The first ground conductor is provided on the same layer as the layer of the second signal line and overlapped with the first signal line when viewed in the Z-axis direction. The second ground conductor is provided on the same layer as the layer of the first signal line and overlapped with the second signal line when viewed in the Z-axis direction. A first transmission line includes the first signal line, the first ground conductor, and an insulating base material, and a second transmission line includes the second signal line, the second ground conductor, and the insulating base material.

Abstract: A resin multilayer substrate includes a plurality of insulating resin base material layers and a plurality of conductor patterns provided on the plurality of insulating resin base material layers. The plurality of conductor patterns include a signal line and a ground conductor overlapping the signal line as viewed from a laminating direction of the insulating resin base material layers. A plurality of openings are provided in the ground conductor, and an aperture ratio is higher in a zone far from the signal line than in a zone adjacent to or in a vicinity of the signal line in a direction perpendicular or substantially perpendicular to the laminating direction.

Abstract: A resin multilayer substrate includes a plurality of insulating resin base material layers and a plurality of conductor patterns provided on the plurality of insulating resin base material layers. The plurality of conductor patterns include a plurality of signal lines provided at positions not overlapping each other as viewed from a laminating direction of the insulating resin base material layers, and a ground conductor overlapping the plurality of the signal lines as viewed from the laminating direction. Openings are provided in the ground conductor and, as viewed from the laminating direction, an aperture ratio is higher in an inner zone that is sandwiched between two signal lines than in an outer zone of the two signal lines.

Abstract: An interposer includes a stacked body including insulating base material layers that are stacked on one another, first and second electrodes, a conductor pattern, and an interlayer connection conductor. The stacked body includes a first mounting surface including a first electrode, and a second mounting surface facing the first mounting surface and including a second electrode. The first electrode is electrically connected to the second electrode through the conductor pattern and the interlayer connection conductor. A length of an electrical path including conductor patterns connecting the first electrode and the second electrode is larger than a total length of the interlayer connection conductor in a stacking direction.

Abstract: A multilayer substrate includes a base body including a first main surface, a first external electrode provided on the first main surface and made of metal foil, a first interlayer connection conductor, and a second interlayer connection conductor having higher conductivity than the first interlayer connection conductor. The base body includes insulating base material layers that are stacked on one another. The first interlayer connection conductor is provided at least in an insulating base material layer on which the first external electrode is provided, and is connected to the first external electrode. The second interlayer connection conductor is disposed inside the base body, and is connected to the first external electrode through the first interlayer connection conductor.

Abstract: A multilayer wiring board includes a first insulating layer, a second insulating layer stacked on the first insulating layer, a via conductor inside each of the first insulating layer and the second insulating layer, and a conductive bonding layer that bonds the via conductors to each other. The first insulating layer is directly bonded to the second insulating layer, and a relationship a1>b1 is satisfied, where a1 is a maximum diameter of the bonding layer and b1 is a maximum diameter of the via conductor at an interface with the bonding layer.

Abstract: A transmission line substrate includes a stacked body that includes insulating base materials, first and second signal lines, and first and second ground conductors. The second signal line is provided on a layer different from the layer of the first signal line and extends in parallel with the first signal line. The first ground conductor is provided on the same layer as the layer of the second signal line and overlapped with the first signal line when viewed in the Z-axis direction. The second ground conductor is provided on the same layer as the layer of the first signal line and overlapped with the second signal line when viewed in the Z-axis direction. A first transmission line includes the first signal line, the first ground conductor, and an insulating base material, and a second transmission line includes the second signal line, the second ground conductor, and the insulating base material.

Abstract: This disclosure provides an antenna apparatus in which stable antenna characteristics are maintained by detecting surrounding conditions that affect the antenna characteristics and appropriately compensating the antenna characteristics. More specifically, when surrounding condition such as a human body (e.g., a palm or fingers) approaches and enters an electric field of a pseudo dipole formed by an antenna element electrode, a stray capacitance is sensed and stable antenna characteristics are maintained by appropriately controlling an antenna matching circuit to compensate for a change in the antenna characteristics due to the approach of the surrounding condition.

Abstract: A transmission line portion of a flat cable that is bent at a position along the longitudinal direction includes a dielectric element body, a first ground conductor, and a second ground conductor. The dielectric element body includes a signal conductor at the middle position of the thickness direction. The first ground conductor includes elongated conductors and bridge conductors. The elongated conductors are spaced in the width direction of the dielectric element body, and extend in the longitudinal direction. The bridge conductors connect the elongated conductors at spacings along the longitudinal direction. The spacing of bridge conductors across the bending point in a bent portion is smaller than the spacing of adjacent bridge conductors located in a straight portion.