Abstract: A coil antenna structure includes a first magnetic component extending in the thickness direction of a tabular primary casing. A second magnetic component and a third magnetic component, which are magnetically connected to the first magnetic component, are disposed on the first principal surface side and the second principal surface side of the primary casing, respectively. The first magnetic component is provided with a coil component surrounding it. In this manner, a U-shaped magnetic path is provided at an end portion of the primary casing so as to detour around a substrate defining an internal conductor. Likewise, a U-shaped magnetic path including fourth to sixth magnetic components is provided in a secondary casing defining a clamshell type casing together with the primary casing so as to detour around a substrate defining as an internal conductor.

Abstract: A coil antenna structure includes a first magnetic component extending in the thickness direction of a tabular primary casing. A second magnetic component and a third magnetic component, which are magnetically connected to the first magnetic component, are disposed on the first principal surface side and the second principal surface side of the primary casing, respectively. The first magnetic component is provided with a coil component surrounding it. In this manner, a U-shaped magnetic path is provided at an end portion of the primary casing so as to detour around a substrate defining an internal conductor. Likewise, a U-shaped magnetic path including fourth to sixth magnetic components is provided in a secondary casing defining a clamshell type casing together with the primary casing so as to detour around a substrate defining as an internal conductor.

Abstract: A laminated electronic component includes a composite obtained by integrally sintering a plurality of laminated magnetic layers, internal conductors being formed in the interior of the composite. The internal conductor and the magnetic layers constitute a plurality of inductance elements, or an inductance element and a capacitance element. The magnetic layer has a composition containing a primary component comprising 45 to 50 mole percent Fe2O3, 0 to 33 mole percent ZnO, and 6 to 20 mole percent CuO, and the balance being NiO, and a Mn compound wherein the Mn compound is contained in an amount of 0.01 to 2.0 weight percent as MnO in the composition.

Abstract: A laminated electronic component includes a composite obtained by integrally sintering a plurality of laminated magnetic layers, internal conductors being formed in the interior of the composite. The internal conductor and the magnetic layers constitute a plurality of inductance elements, or an inductance element and a capacitance element. The magnetic layer has a composition containing a primary component comprising 45 to 50 mole percent Fe2O3, 0 to 33 mole percent ZnO, and 6 to 20 mole percent CuO, and the balance being NiO, and a Mn compound wherein the Mn compound is contained in an amount of 0.01 to 2.0 weight percent as MnO in the composition.

Abstract: A method of manufacturing a ferrite sintered body includes the steps of: adding B4C in a ferrite raw material and firing the ferrite raw material, whereby the ferrite sintered body has a high &mgr;i and a high Q, is less irregular in its characteristics, has a high volume resistivity and is capable of preventing deterioration of insulating resistance.

Abstract: A method of producing a Ni—Cu—Zn ferrite material comprises the steps of preparing a mixture of an iron compound powder having a specific surface area of about 8.5 m2/g or more, a nickel compound powder, copper compound powder and a zinc compound powder, the mixture having a specific surface area of about 8.0 m2/g or more; pre-calcining the mixture such that the pre-calcined mixture has a surface area of about 5.0 m2/g or more and a spinel crystal synthesizability within a range of about 80.5% to 98%; and milling the pre-calcined mixture to obtain a powder of a Ni—Cu—Zn ferrite material having a specific surface area of about 6.0 m2/g or more.

Abstract: A microwave non-reciprocal circuit element which is further miniaturized and of low losses without causing conductor losses in center electrodes following miniaturization. The microwave non-reciprocal circuit element according to the present invention comprises a plurality of center electrodes which are arranged to intersect with each other in a state electrically insulated from each other, and a microwave magnetic or dielectric body which is arranged on an intersecting portion of the plurality of center electrodes, and the respective center electrodes are formed by a plurality of conductors 55, 56 and 57 which are stacked through the microwave magnetic or dielectric body.

Abstract: A magnetic material for high frequencies consists essentially of a main component expressed by the general formula:(Y.sub.3-x-2z Ca.sub.x+2z)(Fe.sub.w-x-y-z Sn.sub.x Al.sub.y V.sub.z)O.sub.4.5+1.5wwhere x, y, z and w take respective values within the following ranges: 0.10.ltoreq.x.ltoreq.0.60, 0.00.ltoreq.y.ltoreq.0.20, 0.20.ltoreq.z.ltoreq.0.60, 4.88.ltoreq.w.ltoreq.4.92, and an additional component of CeO.sub.2 incorporated therein in an amount of not less than 0.1 wt % but not more than 0.5 wt %.

Abstract: A high-frequency use non-reciprocal circuit includes a sintered body which is a high-frequency use magnetic body obtained by a ceramic lamination/integral firing technique, a plurality of central electrodes which are arranged in the sintered body to be separated from each other through a magnetic layer while intersecting with each other at central portions, and electrodes for deriving impedance-matching capacitance which are formed in the vicinity of the intersecting portion to be in series with the central electrodes. The magnetic layer provided between the central electrodes serves as an insulating layer for electrically insulating the central electrodes from each other, a high-frequency use magnetic layer, and a material layer for deriving the impedance-matching capacitance.

Abstract: A magnetic material for high frequencies consists essentially of a main component expressed by the general formula:(Y.sub.3-2z Ca.sub.2z) (Fe.sub.w-x-y-z In.sub.x Al.sub.y V.sub.z)O.sub.4.5+1.5wwhere x, y, z and w take respective values within the following ranges: 0.02.ltoreq.x.ltoreq.0.80, 0.00.ltoreq.y.ltoreq.0.10, 0.30.ltoreq.z.ltoreq.0.50, 4.88.ltoreq.w.ltoreq.4.92, and an additional component composed of at least one oxide selected from the group consisting of CeO.sub.2, TiO.sub.2, ZrO.sub.2, SnO.sub.2 and HfO.sub.2. The additional component is incorporated into the main component in an amount of not less than 0.1 percent by weight but not more than 0.5 percent by weight.

Abstract: A magnetic material for mircowave and millimeter wave frequencies consists essentially of a basic composition and at least one additive incorporated therein, the basic composition being represented by the general formula:Li.sub.x Fe.sub.y Ti.sub.z O.sub.0.5+y+1.5zwhere x, y and z are mole fractions of three components and each takes a value within the following respective ranges, 0.15.ltoreq.x.ltoreq.0.30, 0.55.ltoreq.y.ltoreq.0.85, 0.ltoreq.z.ltoreq.0.30, and x+y+z=1.00, and the additive being at least one oxide selected from the group consisting of lead oxide, vanadium oxide, boron oxide and silicon oxide. The content of the additive ranges from not less than 0.01 mol % to not more than 1.0 mol % in terms of PbO, V.sub.2 O.sub.5, B.sub.2 O.sub.3 and SiO.sub.2, respectively.

Abstract: A dielectric ceramic composition for microwave frequencies comprises a solid solution of BaO, SnO.sub.2, MgO and Ta.sub.2 O.sub.5, said solid solution being represented by the general formula:Ba(Sn.sub.x Mg.sub.y Ta.sub.z)O.sub.7/2-x/2-3y/2where x, y and z are mole fractions of the respective components, 0.04.ltoreq.x.ltoreq.0.26, 0.23.ltoreq.y.ltoreq.0.31, 0.51.ltoreq.z.ltoreq.0.65, and x+y+z=1.00.

Abstract: A high frequency dielectric ceramic composition is described, said composition being represented by the formula: Ba(Zr.sub.x Zn.sub.y Ta.sub.z)O.sub.7/2-x/2-3y/2, wherein 0.02.ltoreq.x.ltoreq.0.13, 0.28.ltoreq.y.ltoreq.0.33 and 0.59.ltoreq.z.ltoreq.0.65 (where x+y+z=1). The ceramic composition has a complex perovskite structure, provides a high dielectricity and high Q value at high frequency and selectively provides a temperature coefficient of resonant frequency with a center value of 0 ppm/.degree.C., without using high sintering temperatures and/or long sintering times.