Abstract: A band-pass filter includes a first input/output port, a second input/output port, a plurality of resonators, and a multilayer stack. The multilayer stack includes a plurality of stacked dielectric layers. Each of the resonators is an open-ended resonator formed of a conductor line in the multilayer stack. Each of the resonators includes a resonator conductor portion including a first line part and a second line part located away from each other in a direction orthogonal to a stacking direction of the plurality of dielectric layers, and a third line part connecting the first line part and the second line part. The first to third line parts extend to surround a space between the first line part and the second line part.

Abstract: In a multilayer filter, first and second resonant circuits are arranged in a direction crossing a stacking direction of a plurality of dielectric layers. An input/output portion includes an input/output port group including an unbalanced port and a pair of balanced ports or an input/output port group including two pairs of balanced ports. The second resonant circuit includes an inductor conductor, a first capacitor conductor, and a second capacitor conductor. The inductor conductor includes first and second ends. The first capacitor conductor is connected to the first end. The second capacitor conductor is connected to the second end. The second dielectric layer has a dielectric constant lower than that of the first dielectric layer. The first and second capacitor conductors are provided in the first dielectric layer. At least a part of the inductor conductor is provided in the second dielectric layer.

Abstract: In a multilayer filter, first to fourth resonant circuits are connected to an input/output portion. The input/output portion includes an input/output port group including an unbalanced port and a pair of balanced ports or an input/output port group including two pairs of balanced ports. Each of the first to fourth resonant circuits includes an inductor conductor and first and second capacitor conductors. The inductor conductor includes first and second ends. The first capacitor conductor is connected to the first end. The second capacitor conductor is connected to the second end. The second and third resonant circuits are magnetically coupled to each other. The second and third resonant circuits are arranged between the first resonant circuit and the fourth resonant circuit in a first direction. Each of first and second electrodes of a jump capacitor conductor is connected to the inductor conductors of the first and fourth resonant circuits.

Abstract: A filter includes a first port, a second port, a path, a circuit part, and at least one cavity resonator. The path connects the first port and the second port. The circuit part is provided in the path. Each of the at least one cavity resonator is coupled with the path from an outside of the path in a circuit configuration. The first cavity resonator is coupled with the path between the first port and the circuit part. The second cavity resonator is coupled with the path between the second port and the circuit part.

Abstract: A filter circuit includes two ports, a first resonant circuit, and a second resonant circuit. The first resonant circuit is provided between the two ports in a circuit configuration and coupled with both of the two ports. The second resonant circuit is provided between the two ports in the circuit configuration and coupled with at least one of the two ports. Coupling of the second resonant circuit and the two ports is weaker than coupling of the first resonant circuit and the two ports.

Abstract: A filter device includes a ground conductor layer, at least one through hole electrically connected to the ground conductor layer, a first resonator conductor layer and a second resonator conductor layer arranged to sandwich the at least one through hole, and a stack. The first resonator conductor layer extends in a first direction becoming away from the at least one through hole, i.e., the ?X direction. The second resonator conductor layer extends in a second direction becoming away from the at least one through hole, i.e., the X direction.

Abstract: A filter circuit includes a pair of balanced input ports, a pair of balanced output ports, first and second resonators provided in parallel between the pair of balanced input ports and the pair of balanced output ports in a circuit configuration, a first capacitor connected in parallel to the first resonator, and a second capacitor connected in parallel to the second resonator. The first and second resonators are magnetically coupled to each other and electrically connected to each other. The first and second capacitors are not electrically connected to ground.

Abstract: A filter circuit includes a pair of balanced input ports, a pair of balanced output ports, and first and second resonators provided in parallel between the pair of balanced input ports and the pair of balanced output ports in a circuit configuration, the first and second resonators being magnetically coupled to each other. Between the first resonator and the second resonator, a capacitor is present but no inductor is present in the circuit configuration.

Abstract: A band-pass filter includes an unbalanced port, a first balanced port, a second balanced port, and first to third resonators provided between the unbalanced port and the first and second balanced ports. The second resonator and the third resonator each are a resonator with both ends open. The second resonator and the third resonator are adjacent to each other in a circuit configuration, and electromagnetically coupled by magnetic coupling as main coupling. The first resonator is provided closer to the second resonator than to the third resonator, and jump-coupled to the third resonator.

Abstract: A band-pass filter includes an unbalanced port, a first balanced port, a second balanced port, and first to third resonators provided between the unbalanced port and the first and second balanced ports. The second resonator and the third resonator each are a resonator with both ends open. The second resonator and the third resonator are adjacent to each other in a circuit configuration, and electromagnetically coupled by magnetic coupling as main coupling. The first resonator is provided closer to the second resonator than to the third resonator, and jump-coupled to the third resonator.

Abstract: A band-pass filter includes an unbalanced port, a first balanced port, a second balanced port, and first to third resonators provided between the unbalanced port and the first and second balanced ports. The second resonator and the third resonator each are a resonator with both ends open. The second resonator and the third resonator are adjacent to each other in a circuit configuration, and electromagnetically coupled by magnetic coupling as main coupling. The first resonator is provided closer to the second resonator than to the third resonator, and jump-coupled to the third resonator.

Abstract: A balun includes first to fourth lines and a stack. A plurality of first conductor layers forming the first and third lines are located in a first region in the stack. A plurality of second conductor layers forming the second and fourth lines are located in a second region in the stack. A ground conductor layer is located closer to the second region than to the first region. The plurality of second conductor layers include a conductor layer pair where a distance between two conductor layers is smallest.

Abstract: A band-pass filter includes a first input/output port, a second input/output port, a plurality of resonators, and a multilayer stack. The multilayer stack includes a plurality of stacked dielectric layers. Each of the resonators is an open-ended resonator formed of a conductor line in the multilayer stack. Each of the resonators includes a resonator conductor portion including a first line part and a second line part located away from each other in a direction orthogonal to a stacking direction of the plurality of dielectric layers, and a third line part connecting the first line part and the second line part. The first to third line parts extend to surround a space between the first line part and the second line part.

Abstract: An antenna includes: a dielectric layer including a first and second surface placed in layering; a ring-shaped conductor layer formed on the first surface; a first and second feedline that are closer to the first surface than the second, and are formed at positions different from those of the surfaces; a reference potential conductor layer formed on the second surface; and a conductor pin located in the inner diameter of the ring-shaped conductor layer in planar view from the direction of the layering, that is connected to the reference potential conductor layer. In the planar view, the first and second feedlines include portions overlapping with the ring-shaped conductor layer, and the extending directions of the feedlines intersect with each other. The ring-shaped conductor layer is connected to neither the reference potential conductor layer nor the conductor pin, and neither the first nor second feedline is connected to the conductor pin.

Abstract: A directional coupler includes first to fourth terminals, a first line, a second line, a ground conductor portion, and a stack. The first line includes a first center portion, a first connecting portion, and a second connecting portion. The second line includes a second center portion, a third connecting portion, and a fourth connecting portion. A distance between the first and third connecting portions and a distance between the second and fourth connecting portions decrease toward the first and second center portions. The first to fourth terminals are located on a bottom surface of the stack.

Abstract: A band-pass filter includes an unbalanced port, a first balanced port, a second balanced port, and first to third resonators provided between the unbalanced port and the first and second balanced ports. The second resonator and the third resonator each are a resonator with both ends open. The second resonator and the third resonator are adjacent to each other in a circuit configuration, and electromagnetically coupled by magnetic coupling as main coupling. The first resonator is provided closer to the second resonator than to the third resonator, and jump-coupled to the third resonator.

Abstract: A balun includes first to fourth lines and a stack. A plurality of first conductor layers forming the first and third lines are located in a first region in the stack. A plurality of second conductor layers forming the second and fourth lines are located in a second region in the stack. A ground conductor layer is located closer to the second region than to the first region. The plurality of second conductor layers include a conductor layer pair where a distance between two conductor layers is smallest.

Abstract: A directional coupler includes first to fourth terminals, a first line, a second line, a ground conductor portion, and a stack. The first line includes a first center portion, a first connecting portion, and a second connecting portion. The second line includes a second center portion, a third connecting portion, and a fourth connecting portion. A distance between the first and third connecting portions and a distance between the second and fourth connecting portions decrease toward the first and second center portions. The first to fourth terminals are located on a bottom surface of the stack.

Abstract: An antenna includes: a dielectric layer including a first and second surface placed in layering; a ring-shaped conductor layer formed on the first surface; a first and second feedline that are closer to the first surface than the second, and are formed at positions different from those of the surfaces; a reference potential conductor layer formed on the second surface; and a conductor pin located in the inner diameter of the ring-shaped conductor layer in planar view from the direction of the layering, that is connected to the reference potential conductor layer. In the planar view, the first and second feedlines include portions overlapping with the ring-shaped conductor layer, and the extending directions of the feedlines intersect with each other. The ring-shaped conductor layer is connected to neither the reference potential conductor layer nor the conductor pin, and neither the first nor second feedline is connected to the conductor pin.