Abstract: A method of manufacturing a circulator comprising the steps of providing a central substrate layer with at least one cut-out section and circuit lines. Next, providing a magnet placed within said cut-out section and a ferrite placed on each side of said substrate layer. A steel plate is placed on each side of the substrate layer. Spacer layers are provided on each side of the substrate layer. An outer shim layer is placed on each side of the central substrate layer. Laminate sheets are placed between the substrate layer, the spacer layers, and the outer shim layers. Holes are drilled through each of the substrate, the spacer layers, the outer shims, and the laminate sheets. Heat and pressure are provided to cause the laminate sheets to flow in order to join the substrate, magnets, ferrites, steel plates, spacer layers and outer shim layers into a unitary structure. Finally the structure is plated.

Abstract: A highly reliable nonreciprocal circuit device can be easily manufactured at low cost. In the nonreciprocal circuit device, a resin layer is formed on the surface of a metal case. On a ferrite member, the terminals of central conductors are arranged with a predetermined angle therebetween. Inside a resin case including input/output terminals and ground terminals, there are arranged the ferrite member, the central conductors, a permanent magnet for applying a static magnetic field to the ferrite member and the central conductors, a resistor, and capacitors. The resin case is sandwiched by an upper yoke and a lower yoke. A resin layer formed of a thermosetting resin is arranged on each of the yokes. When the permanent magnet is thermally demagnetized, the thermosetting resin layer is hardened at the same time.

Abstract: A non-reciprocal circuit element for transmitting a signal in one way or cyclically transmitting the signal by using circuit means having at least a ferrite (34), transmission lines (31, 32, and 33), and a capacitor (21), has:

Abstract: A non-reciprocal circuit element for transmitting a signal in one way or cyclically transmitting the signal by using circuit means having at least a ferrite (34), transmission lines (31, 32, and 33), and a capacitor (21), has:

Abstract: Insulating tape having an adhesive layer is applied to the lower face of the top wall of an upper yoke, by automated equipment or the like. The thickness of the insulating tape including the adhesive layer is set to a thin thickness, such as 0.01 to 0.05 mm for example, so that the height-wise dimensions of the product do not become great. Polyester resin, or material with deformation temperature of 200° C. or higher (e.g., polyimide resin, polyamide resin, fluororesin) is used for the material of the insulating tape. A silicone adhesive agent or an acrylic adhesive agent or the like is used for the adhesive layer of the insulating tape. Thus, short-circuiting between the matching capacitors and the yoke can be effectively prevented, thereby providing a nonreciprocal circuit device and communication device with high reliability at low costs.

Abstract: An isolator serving as a nonreciprocal circuit device includes a permanent magnet, a ferrite to which a DC magnetic field is applied by the permanent magnet, a plurality of center electrodes placed on the ferrite, and upper and lower casings for accommodating the permanent magnet, the ferrite, and the center electrodes. The upper and lower casings are made of a material chiefly containing iron, and the average value of the surface roughness of the casings is less than or equal to 0.9 &mgr;m. The front and rear surfaces of the upper and lower casings are Ag-plated.

Abstract: There are provided a center-electrode assembly and a manufacturing method therefor, in which electrical characteristics are stable and handling is easy, and which is suitable for mass-production, and a nonreciprocal circuit device and a communication apparatus using the center-electrode assembly. A center-electrode assembly for an isolator includes a ferrite, center-electrode patterns and insulating films deposited on the top surface of the ferrite, a ground pattern formed on the back surface of the ferrite, and connecting electrodes formed on side-faces of the ferrite. Each connecting electrode electrically connects between the center-electrode patterns formed on the top surface and the ground pattern formed on the back surface.

Abstract: A three port distributed waveguide circulator has a hybrid coupler section connected to a waveguide section which is bifurcated by a central web plate to produce reduced height stacked waveguides and which is loaded with a distributed non-reciprocal ferromagnetic material for producing relative phase shifting of the microwave power traveling through the reduced height guides. In one embodiment, the coupler output is stepped down to the reduced height waveguides by a stepped transformer between the output of the hybrid coupler and the bifurcated input end of the bifurcated waveguide section. Alternatively, a tapered transformer is provided. A static magnetic circuit is provided for producing transverse static magnetic fields in the reduced height waveguides necessary for the distributed ferromagnetic material to exhibit non-reciprocal properties.

Abstract: A resin member is arranged between a permanent magnet, and a resistance element and a matching capacitor or the like. The ports of center electrodes are electrically connected to the resistance element and the matching capacitor element on the top faces of the resistance element and the matching capacitor element. A convexity of which the height is substantially equal to the electrode thickness of the ports of the center electrodes is formed on the under face of the resin member.

Abstract: A non-reciprocal circuit element for transmitting a signal in one way or cyclically transmitting the signal by using circuit means having at least a ferrite (34), transmission lines (31, 32, and 33), and a capacitor (21), and has at least two external input/output terminals (11 and 12) for transferring a signal to and from an external unit and at least one of external grounding terminals (13, 14, and 15) for grounding, wherein at least one (13) of the external grounding terminals is set between at least one set of the external input/output terminals (11 and 12).

Abstract: A high power combiner arrangement with improved isolation between input ports for high power applications. In particular, in accordance with high power combiner arrangement, power combining logic is combined with a series of isolators such that at least one isolator is inserted between each power source, i.e., a signal source, and a corresponding input port to the power combining logic. The number of isolators inserted is determined as a function of the isolation requirements of the overall application. Advantageously, the degree of isolation achieved by the high power combiner is directly proportional to the number of inserted isolators placed between each power source. Furthermore, the insertion of a number of high power circulators between each power source and the power combing logic facilitates the achievement of higher isolation between the power sources with minimal degradation in signal characteristics.

Abstract: A nonreciprocal circuit device includes conductive films that define a slot on the top of a magnetic member having ferrimagnetic characteristics. On the bottom of the magnetic member, other conductive films that define an opposing slot are formed. An external DC magnetic field is applied substantially parallel to the magnetic member and substantially perpendicular to the slots. Resistive films are formed alongside the slot on the top of the magnetic member. When a signal propagates in the direction from port #2 to port #1, the electromagnetic field of a planar dielectric line mode is localized in the direction of the resistive films. Electrical power is consumed by the resistive films, so that the signal is prevented from propagating. When the signal propagates in the direction from port #1 to port #2, no loss is caused by the resistive films. Therefore, the signal is transmitted with low loss.

Abstract: A nonreciprocal circuit device includes a resin-molded housing having an input terminal, an output terminal, and a ground terminal. The resin-molded housing includes a magnetic assembly composed of a central conductor and a ferrite member, a permanent magnet, and a spacer. The resin-molded housing includes a series capacitor which is connected to the input port of the central conductor, a parallel capacitor connected either between the input terminal and the ground terminal, or between the input port and the ground terminal, a parallel capacitor connected to the output port of the central conductor, a parallel capacitor connected to the terminating port of the central conductor, and a terminating resistor. The parallel capacitor connected to the terminating port may be replaced by a series capacitor, and in that case, an additional parallel capacitor may be provided between the series capacitor and the ground terminal. The top of the resin-molded housing is covered with an upper yoke.

Abstract: On a ferrite, central conductors are disposed so as to intersect each other, whereby a magnetic assembly is formed. A permanent magnet for applying a direct-current magnetic field to the ferrite 54 is provided. The residual flux density of the permanent magnet is at least 0.420 [T], the coercive force iHc is at least 344 [kA/m], and the coercive force bHc is at least 320 [kA/m].

Abstract: A ferrite structure for non-reciprocal microwave device such as circulator/isolator. The structure includes one or more composite ferrite bodies, each having at least one region of soft ferrite material and at least one region of hard ferrite material, and at least two ferrous/ferrite plates. The ferrous/ferrite plates are attached to the composite ferrites so as to contribute to the completion of magnetic loop via hard and soft ferrite regions of the composite ferrites. The soft and hard ferrite regions are magnetized in the opposite direction. The range of operation is selected to be between the resonant frequencies of soft and hard ferrite materials. With such setting the hard and soft ferrite regions provide the circulation in the same direction. As compared to the state-of-the art devices, the circulators/isolators made according to the present invention incorporate the confined-flux self-magnetized ferrite structure, thus eliminating the use of conventional magnets.

Abstract: A highly reliable nonreciprocal circuit device facilitating incorporation of matching capacitors and a communication apparatus incorporating the same are disclosed. In the nonreciprocal circuit device, central conductors are integrally extended from a ground plate abutting on the bottom of a ferrite plate to be mutually crossed on the upper surface of the ferrite plate via an insulation sheet after passing over the side surfaces of the ferrite plate. Matching capacitors are connected by soldering between capacitor-connecting terminals integrally extended from the ground plate and the ports of the central conductors in such a manner that electrode surfaces of the matching capacitors are set perpendicularly with respect to a main surface of the ferrite plate.

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: A nonreciprocal circuit device comprises a dielectric wave guide comprising a dielectric body with a center and with strips extending radially from the center in at least two directions and arranged between two conductor plates defining parallel conductor planes; a ferrite body arranged in the center of the dielectric strip; and a medium having a lower dielectric constant than the dielectric body arranged between at least a side face of the ferrite body and the conductor plates adjacent to the side face of the ferrite body. Grooves into which a dielectric strip is fitted are formed in the opposing surfaces of two conductor plates. The width of the dielectric strip is increased in the center of the dielectric strip and in the direction along the conductor planes of the conductor plates. At the widened location, a space is formed between the side walls of the grooves and the side faces of the ferrite sheets.

Abstract: A nonreciprocal circuit device includes a metal lower case made of magnetic metal, a resin terminal case, a central electrode assembly, a metal upper case made of magnetic metal, a permanent magnet, and an electric-circuit-component assembly. The electric-circuit-component assembly is disposed on a side of the permanent magnet, and is formed such that a coil and a capacitor are mounted on a substrate. The electric-circuit-component assembly is disposed in parallel to the thickness direction of the permanent magnet so as to be below the surface of the permanent magnet, and has a portion overlapping with the permanent magnet.

Abstract: The present invention provides a nonreciprocal circuit device which can be assembled by an automatic assembling machine, and in which the built-in components thereof can be disposed with a high positioning accuracy, and further provides a communication apparatus using this nonreciprocal circuit device. The nonreciprocal circuit device as an isolator includes a metallic lower case portion, a resin terminal case, a center electrode assembly, a metallic upper case portion, and a permanent magnet. Inside the terminal case, there are provided irregular-shaped guide portions for disposing nonreciprocal circuit components such as the center electrode assembly, at a predetermined position, and more specifically, a window portion, recesses for capacitors, and a bank portion for permanent magnet. These guide portions have tapered side wall surfaces each having a predetermined taper angle &thgr;.

Abstract: A nonreciprocal circuit device as a lumped-constant isolator includes a metal lower case portion, a resin terminal case, a central electrode assembly, a metal upper case portion, a permanent magnet, an insulating spacer, a resistor element, and matching capacitors. The thickness of the resistor element is not less than 0.1 mm and not greater than 0.5 mm.

Abstract: Three mutually intersecting central conductors are positioned on ferrite to which a direct current magnetic field is applied, the port portions of two of the central conductors are branched and one branched portion of each is extended and bent so as to form an inductor. These inductors and capacitors with one end connected to a ground terminal make up series resonant circuits. The resonance frequencies of the series resonant circuits are set to approximately two times and approximately three times that of the center frequency of the pass band of the device which is the basic wave frequency, thereby causing attenuation of twofold waves and threefold waves of the basic wave, thus acting as matching capacitance or the basic frequency.

Abstract: The present invention provides a nonreciprocal circuit device including a ferrite which has a high dimensional accuracy, and which is inexpensively producible and adaptable to the miniaturization thereof, and further provides a communication apparatus using this nonreciprocal circuit device. In this nonreciprocal circuit device, a microwave ferrite in a center electrode assembly is formed into a rectangular shape in a plan view by cutting out from a prism-block shaped ferrite sintered matrix having a rectangular cross-section, for every predetermined thickness along a cut line C. When cutting, it is desirable to use an inside cutter, a dicer, or the like. In a cut-out ferrite, the dimensional tolerance of each portion thereof is within ±0.05 mm, and the angles &thgr;'s formed by adjacent side surfaces thereof are 90±1°.

Abstract: A compact nonreciprocal circuit device in which a large amount of attenuation can be obtained at a predetermined frequency band without increasing cost. In this nonreciprocal circuit device, three central conductors are arranged in such a manner that the conductors mutually intersect on a ferrite member to which a DC magnetic field is applied. A matching capacitor connected to the port of a first central conductor is designed to have a low self-resonance frequency so as to be equal to or lower than four times the central frequency of a pass band. With this arrangement, since the matching capacitor acts as a trap filter, major spurious components such as the second harmonic and third harmonics can be efficiently attenuated without increasing the number of components to be used.

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: In order to suppress losses, unnecessary radiation, and internal mutual interference produced in a connecting portion between a nonreciprocal circuit device and circuits to be connected thereto and to promote reduction in size and weight of the device, a nonreciprocal circuit device and its mounting structure are provided. Output terminals are disposed on a mounting surface (bottom surface) of an isolator and input terminals are disposed at a height higher from the bottom surface as much as the height of a module circuit board. The top surface of the module circuit board is provided with connecting pads for connecting to the input terminals of the isolator. The module circuit board is provided with a shield case which is connected to ground terminals protruding from a yoke of the isolator. A part in which the module circuit board is integrated with the isolator is mounted on a printed circuit board.

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 non-reciprocal circuit device comprising a plurality of central conductors 11a-11c overlapping with electric insulation from each other at 120°, a magnetic body 12 disposed in contact with or close to the central conductors 11a-11c, matching capacitors, a permanent magnet 3 disposed for applying a DC magnetic field to the central conductors 11a-11c and the magnetic body 12, and metal cases 1, 2 for receiving these parts and serving as a magnetic yoke, at least the matching capacitors being integrally constituted by a laminate module 5 having a substantially flat lower surface, and the laminate module 5 being disposed on a flat surface of a composite base 6 comprising an insulation member and conductor plates.

Abstract: A structure for a high power low IMD passive microwave device, mainly for automated placement. The structure includes substantially flat housing having slots and a cover having notches. Slots and notches form openings to snugly receive printed circuit boards (PCBs) having signal transmission lines on both sides. Also, on both sides of PCBs opposite to the signal lines, the ground planes are located. The passive device is disposed between the housing and the cover, and electrically connected to the signal transmission lines inside the structure that is totally closed and sturdy. Bottom surface of PCBs and that of the housing are coplanar. PCBs are reinforced on both their sides by supports extended from the housing. Such a structure provides homogeneous leads and best conditions for automated placement. Inductance in signal lines is well balanced by capacitance to ground planes that in combination with structurally homogeneous leads provides low IMD.

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

Abstract: A non-reciprocal circuit element includes a microstrip TMn10 resonator (n is a positive integer) with a metal disk and branches projecting from the metal disk in a trigonally symmetric structure, and a ferrite magnetic body spontaneously magnetized and coaxially disposed on the microstrip TMn10 resonator. The metal disk and the branches are formed on a non-magnetic dielectric board having a ground conductor on its bottom face. The ferrite magnetic body is arranged so that a position of an electric field node matches to one of the branches.

Abstract: A nonreciprocal circuit device is provided which prevents the center conductors thereof from interfering with each other when folded toward a magnetic body even when the magnetic body has a rectangle shape in plan view, and which thereby increases the reliability of the bonding portion between the center conductor coupling portion and capacitors or input/output terminals, and a communication device using the same is further provided. A ferrite having a rectangle shape in plan view is placed on the coupling portion of the center conductors, and a magnetic assembly is constructed by folding the center conductors extending from the coupling portion outward so as to wrap the ferrite. At this time, the port portions of the center conductors extending from the coupling portion outward substantially line-symmetrically are formed asymmetrically with each other so as not to mutually interfere when these center conductors are folded toward the magnetic body.

Abstract: An isolator is disclosed, in which a ferromagnetic sheet is placed into a shielding resin case together with garnet ferrite and an internal terminal sheet (with strip lines extending therefrom). Thus the leakage magnetic flux shielding effect is reinforced, and the bulk of the isolator is made compact. The constitution is as follows. That is, the internal terminal sheet (with the strip lines extending therefrom), a garnet ferrite, a plurality of insulating films and a ferromagnetic sheet are inserted into a shielding resin case in the cited order. Further, this structure is inserted into between upper and lower cases, and three dielectric devices and a chip resistor are disposed on a PCB and around the lower case, while a connecting terminal part with input/output terminals connected to the PCB electrodes is formed on the PCB.

Abstract: A circulator having integrally formed conductors (20, 21, and 22) which may be folded to form overlaying conductors of a circulator. The circulator includes a lens (44) for shaping a biasing magnetic field distribution to compensate for non-uniformity of magnetic field strength caused by irregularities of a magnetic circuit or the shape of a magnet (45) or ferrite (40, 41). The characteristics of ferrite discs (40,41) are preferably correlated with the characteristics of a permanent magnet (45) so that variations of permeability of the ferrite (40, 41) are minimized over a specified temperature range.

Abstract: Insulating tape having an adhesive layer is applied to the lower face of the top wall of an upper yoke, by automated equipment or the like. The thickness of the insulating tape including the adhesive layer is set to a thin thickness, such as 0.91 to 0.05 mm for example, so that the height-wise dimensions of the product do not become great. Polyester resin, or material with deformation temperature of 200° C. or higher (e.g., polyimide resin, polyamide resin, fluororesin) is used for the material of the insulating tape. A silicone adhesive agent or an acrylic adhesive agent or the like is used for the adhesive layer of the insulating tape. Thus, short-circuiting between the matching capacitors and the yoke can be effectively prevented, thereby providing a nonreciprocal circuit device and communication device with high reliability at low costs.

Abstract: An apparatus for doubling the amount of power that can be safely applied to a circulator-based isolator, which is made up of an input hybrid which receives an RF signal and outputs two divided RF signals, a Y-junction circulator that receives one of the divided RF signals at one of the circulator ports and outputs it at another circulator port, an output hybrid which receives the two divided RF signals, combines them, and sends them on, the output hybrid simultaneously receiving a returned signal, dividing it, and outputting two divided returned signals, one divided returned signal going to the circulator and the other divided returned signal going directly to the input hybrid, a phase retarding circuit which takes the half of the divided returned signal that went back to the circulator and retards its phase by 180 degrees and sends it back to the circulator, where it goes to the input hybrid as well, to be recombined with the other half of the returned signal and attenuated.

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: An apparatus for doubling the amount of power that can be safely applied to a circulator-based isolator, which is made up of an input hybrid which receives an RF signal and outputs two divided RF signals, a Y-junction circulator that receives one of the divided RF signals at one of the circulator ports and outputs it at another circulator port, an output hybrid which receives the two divided RF signals, combines them, and sends them on, the output hybrid simultaneously receiving a returned signal, dividing it, and outputting two divided returned signals, one divided returned signal going to the circulator and the other divided returned signal going directly to the input hybrid, a phase retarding circuit which takes the half of the divided returned signal that went back to the circulator and retards its phase by 180 degrees and sends it back to the circulator, where it goes to the input hybrid as well, to be recombined with the other half of the returned signal and attenuated.

Abstract: A substrate-type non-reciprocal circuit element comprises a substrate, a ferrite embedded in the substrate, a central electrode formed on the ferrite at one principal surface of the substrate, a plurality of signal conductors formed on the one principal surface of the substrate to extend from the central electrode into a plurality of different outward directions, a first ground electrode formed on the one principal surface of the substrate, separately from the central electrode and the plurality of signal conductors, and a second ground electrode formed on the other principal surface of the substrate and electrically connected to the first ground electrode. Thus, the substrate-type non-reciprocal circuit element can be easily electrically connected to a measurement machine, to enable to precisely and easily measure an electrical characteristics with a good repeatability.

Abstract: A magnetic member 2 for nonreciprocal circuit is fitted in a first hole formed in a dielectric substrate 1 and at least one magnetic member 3 is fitted in a second hole formed in a portion of the dielectric substrate 1, which surrounds the first hole. An electrical conductor is printed on surfaces of the dielectric substrate 1 and the magnetic member 2 for nonreciprocal circuit to form a micro strip line 4. A grounding conductor 5 is formed on the other surface of the dielectric substrate 1. Changing the magnetization of the magnetic member 3 for frequency regulation can reversibly perform a regulation of the frequency characteristics of the nonreciprocal circuit.

Abstract: A compact, inexpensive nonreciprocal circuit device which provides a large attenuation in a particular frequency band, and a communication device incorporating the same. A series resonance circuit in which an inductor and a capacitor are connected in series to each other is connected between a first port of a central conductor and the ground, capacitors are connected between the ground and a second and a third ports of other central conductors and the ground, and a terminating resistor is connected to the third port.

Abstract: To provide a nonreciprocal circuit device which is compact and capable of obtaining a large attenuation in a specified frequency band without increasing the cost, and provided with at least a built-in inductor for a filter, a nonreciprocal circuit constituted together with the nonreciprocal circuit device, and a communication device using the circuit, central conductors are disposed in a ferrite to which the DC magnetic field is applied in an intersecting manner with each other, matching capacitors are respectively connected between port sections of the central conductors and a ground to constitute a nonreciprocal circuit, a solenoid-shaped inductor is connected between the port section of the central conductor and a signal input/output terminal, and the inductor is disposed in a relationship so that the direction of the magnetic flux which is generated by this inductor and passes through the ferrite is substantially perpendicular to the direction of the DC magnetic field to the ferrite.

Abstract: An isolator device with a built-in power amplifier includes a single dielectric multi-layered substrate, a high frequency power amplifier circuit, an isolator element, and circuit elements provided to the dielectric multi-layered substrate. The high frequency power amplifier circuit and the isolator element are connected with each other through the circuit elements and united with the single dielectric multi-layered substrate.

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 non-reciprocal circuit element includes a plurality of inner conductors intersecting with keeping insulation with each other, a shield conductor connected in common to one end of the inner conductors, and a capacitor connected between the shield conductor and a ground of the non-reciprocal circuit element, for adjusting only eigen values of in-phase excitation. Thus, smaller size, lighter weight and lower height can be attained and also temperature characteristics can be optionally adjusted without changing material used and without inviting increased insertion loss.

Abstract: A dielectric wave guide nonreciprocal circuit device wherein the efficiency of applying a DC magnetic field to ferrite plates is increased, the effect on other components of magnetic field leakage from magnets is reduced, and changes in the DC magnetic field, when other magnetic bodies are nearby, are reduced. The dielectric wave guide has dielectric strips clasped between conductive plates. Ferrite plates are provided at a center portion where the dielectric strips converge. Magnets are provided in concavities formed in outer sides of the conductive plates. A closed magnetic path is formed by surrounding the whole structure with magnetic members having side walls.