Abstract: A nonreciprocal circuit device miniaturized entirely by reducing the height and the weight can prevent characteristic deterioration. In the nonreciprocal circuit device, a ferrite assembly is formed by winding a quadrangular ferrite plate with insulated copper wires mutually intersecting. The ferrite assembly is arranged perpendicularly to the mounting surface of a mounting substrate. On each side of the ferrite assembly, there is arranged a magnet applying a static magnetic field perpendicularly to main surface of the ferrite plate.

Abstract: The present invention provides a nonreciprocal circuit device which allows the inductance component of centeral conductors to be enlarged even when a magnetic body is reduced in the size, and which is thereby capable of achieving superior characteristics over a wide band while having a small size, and further provides a communication device using the same. In this nonreciprocal circuit device, a magnetic body is formed by winding two centeral conductors around a magnetic body having a rectangular-parallelepiped plate shape so as to intersect each other at an angle of substantially 90 degrees. As these centeral conductors, metallic wires constituted of a metallic material such as copper or silver are used, the metallic wires being coated with an insulative resin such as polyester or polyimide.

Abstract: The present invention provides a nonreciprocal circuit device which has solved problems, such as the increase in production cost, the reduction in reliability, and the overall upsizing thereof, which are caused by the mounting of a circuit element having a matching circuit onto a printed board, and also provides a communication apparatus including this nonreciprocal circuit. This nonreciprocal circuit includes a ferrite assembly formed by combining mutually intersecting first and second central conductors and a ferrite, magnets applying an magnetostatic field to this ferrite assembly, and a yoke. Furthermore, circuit elements which are connected to the first and second central conductors and which constitute a matching circuit, are formed in a dielectric laminated substrate, on which the ferrite assembly is mounted.

Abstract: A nonreciprocal circuit device reduces layout space when single-board capacitors are used, and meets demands for a smaller and lighter configuration.

Abstract: The present invention provides a nonreciprocal circuit device which allows the relationship between the input and the output to be reversed using the identical terminal layout on a mounting substrate, only by preparing for a single type of nonreciprocal circuit device, and also provides a communication apparatus using this nonreciprocal circuit device. In this reciprocal circuit device, a plurality of centeral conductors are disposed on a ferrite on which DC magnetic field is to be applied, in a state of intersecting one another, matching capacitors are each connected between the ports of the centeral conductors and grounds, and a terminating resistor is connected between a predetermined port and a ground. In a resin case 7, input/output terminals which are conductively connected to the respective ports are disposed at substantially rotation-symmetrical positions with respect to the center of the bottom surface of the resin case.

Abstract: A nonreciprocal circuit device includes a first center electrode and a second center electrode intersecting each other, each having one end thereof grounded, a ferrimagnetic body provided in the vicinity of the first center electrode and the second center electrode, a magnet applying a magnetostatic field to the ferrimagnetic body, a series capacitor connected in series between the other end of the first center electrode and an input terminal and a series capacitor connected in series between the other end of the second center electrode and an output terminal, and a parallel capacitor connected in parallel between the other end of the first center electrode and a ground and a parallel capacitor connected in parallel between the other end of the second center electrode and the ground.

Abstract: A nonreciprocal circuit device including a metal case through which a high frequency current is difficult to flow, and a communication apparatus incorporating the nonreciprocal circuit device. The cross section of the metal case has a rectangular-frame shape formed by inwardly bending a substantially rectangular metal plate at four positions at angles of 90 degrees in parallel to the short edges of the metal plate. The top ends of two arms of the metal case are opposed to each other at a specified distance. As a result, the metal case does not form a loop around a permanent magnet and a central electrode assembly.

Abstract: A nonreciprocal circuit device having a circuit element on a dielectric substrate providing at least part of a low-pass filter, the nonreciprocal circuit device having less interference and irregular operation caused by spurious radiation, and in addition, with reduced insertion loss. A lumped constant isolator (an example of a nonreciprocal circuit device) includes a magnet provided for applying a DC magnetic field to a magnetic assembly, which in turn has multiple intersecting central electrodes provided adjacent to a ferrite body. A dielectric substrate is disposed in between the permanent magnet and the magnetic assembly. An inductor forming part of a &pgr;-type low-pass filter is provided as an example of a circuit element on the dielectric substrate, a dielectric layer or film being disposed between the dielectric substrate and the magnet.

Abstract: A nonreciprocal circuit device requires less layout space when single-board capacitors are used, and meets demands for a smaller and lighter configuration. An isolator (nonreciprocal circuit device) comprises a ferrite, a permanent magnet applying a direct current magnetic field to the ferrite, a plurality of central electrodes respectively having ports disposed on the ferrite and a single-board matching capacitor with capacitor electrodes formed on both surfaces of a dielectric substrate such that the capacitor electrodes are opposed to each other and sandwich the dielectric substrate. In various embodiments, the permanent magnet and/or the ferrite has a square shape and the capacitor electrodes of the matching capacitors are arranged at an angle of 60 to 90 degrees with respect to a mounting surface and the matching capacitors are disposed so as to surround the sides of the ferrite.

Abstract: A nonreciprocal circuit device which can achieve miniaturization and cost reduction by increasing attenuation outside a passband and greatly decreasing the occurrence of extraneous radiation emissions.

Abstract: In the disclosed nonreciprocal circuit device, which employs a single-board-type capacitor, the problem of electrode peeling can be avoided. The nonreciprocal circuit device has characteristics such that attenuation is small in the direction of signal transmission and attenuation is large in the reverse direction and has matching capacitors disposed in signal input/output ports. The matching capacitors are formed of single-board-type capacitors including capacitor electrodes formed so as to be opposed each other on both main surfaces of a dielectric substrate with the substrate in between. An outer peripheral edge of a grounding electrode (or another connected electrode), to which a capacitor electrode of the single-board-type capacitor is connected, is positioned inwardly from an outer peripheral edge of the capacitor electrode.

Abstract: A non-reciprocal circuit device has a plurality of central conductors arranged so as to intersect mutually on a magnetic substance to which a d.c. magnetic field is applied, and matching capacitors connected between the ports of the central conductors and ground. In the non-reciprocal circuit device an inductor is connected between at least one port of the central conductor and the signal-input/output terminal corresponding thereto, to modify the frequency response characteristics thereof.

Abstract: The intersection angle formed by the central conductor connected to an input port and the central conductor connected to an output port is set to more than 120 degrees, preferably about 130 to 150 degrees, for example 140 degrees. The central conductor connected to a terminating port preferably bisects the above-described intersection angle and may be set to either 110 degrees or 70 degrees, for example. The resistance of a terminating resistor connected to the terminating port is set to about 200 to 500 .OMEGA., for example 300 .OMEGA..

Abstract: A nonreciprocal circuit device that avoids the problems of increased loss and narrowed frequency bandwidth when used with a low power supply voltage. An isolator (nonreciprocal circuit device) has a plurality of center electrodes (2 through 4) disposed so as to intersect and having a ferrite (5) disposed in alignment with the point of intersection, to which a DC magnetic field HDC is applied. An impedance conversion circuit (6) is added to the port of any one of center electrodes (2 through 4), setting the input impedance Zi to 2<Zi<12.5 ohms.

Abstract: One or two inductor electrodes formed of hairpin-bent or curved electrode patterns are made on one main surface of a component member of a nonreciprocal circuit device, and connection electrodes are formed on the other main surface at positions corresponding to both ends of each inductor electrode. The component member may be a spacer member or a terminal board. Both ends of each inductor electrode are connected to the connection electrodes by through holes. The port sections of central conductors at the signal input and output side are connected to input and output terminal electrodes through the inductor electrodes, formed on the component member of the nonreciprocal circuit device. Each inductor electrode forms a low-pass filter in combination with capacitances in the nonreciprocal circuit device.