Abstract: An LC filter is disclosed which exhibits excellent attenuation characteristics in a high-frequency range and substantially preserves its self-inductance and Q-factor. The LC filter is constructed of a laminated block formed by laminating insulating sheets each provided with a coil conductor. The coil conductors are connected in series to each other through via-holes to form a coil. Input/output external electrodes and ground external electrodes are disposed on the surfaces of the laminated block. The insulating sheets are laminated in a direction perpendicular to the input/output external electrodes and parallel to the mounting surface. The coil is axially placed perpendicular to the input/output external electrodes and parallel to the ground external electrodes and the mounting surface. A distributed capacitance is generated between the coil and each of the ground external electrodes to form a capacitor.

Abstract: The multilayer microelectronic circuit comprises a main capacitor dielectric layer, a main capacitor first electrode disposed on one of opposite sides of the main capacitor dielectric layer, a main capacitor second electrode disposed on the other of the opposite sides of the main capacitor dielectric layer in a way as to oppose the main capacitor first electrode through the main capacitor dielectric layer, a first trimming capacitor dielectric layer disposed on a side of the main capacitor first electrode opposite to the main capacitor dielectric layer, a first trimming capacitor electrode disposed on a side of the first trimming capacitor dielectric layer opposite to the main capacitor first electrode in a way as to oppose the main capacitor first electrode through the first trimming capacitor dielectric layer, a second trimming capacitor dielectric layer disposed on a side of the first trimming capacitor electrode opposite to the first trimming capacitor dielectric layer, and a second trimming capacitor ele

Abstract: A laminate printed circuit board loaded with transistors, ICs (Integrated Circuits) or LSIs (Large Scale Integrated Circuits) and a method of producing the same are disclosed. The circuit board includes a signal layer, a ground layer and a power supply layer sequentially laminated with the intermediary of insulation layers. An impedance adding circuit is formed in the power supply layer. A magnetic layer is positioned at least above or at least blow the impedance adding circuit. The circuit board with this configuration reduces power supply noise to a noticeable degree.

Abstract: A surface mount filter device is provided having a device body with a plurality of terminations located thereon. Capacitors and inductors are located on the same chip to create a variety of LC filters, such as LPF, HPF, BPF and BRF, or combinations of these options, as well as LC resonator structures. The chip is preferably built by thin film technology, which allows a considerable reduction in component or circuit size. The device body is constructed having a rigid insulative substrate to which a first conductive pattern having one or more first capacitor plates is applied. A dielectric is located over the first conductive pattern, and itself supports a second conductive pattern defining the opposed capacitor plates. One or more layers of insulative polymer are located above the dielectric layer, and have conductor channels in which conductive material is located. The conductive material in the conductive channels forms the coil of the on-chip inductor.

Abstract: An inductance-capacitance (LC) composite component comprising a body obtained by monolithically sintering a capacitor portion having a layered structure consisting of a dielectric ceramic layer and an electrode layer with an inductor portion having a layered structure consisting of a magnetic ceramic layer and an electrode layer, wherein at least one of said dielectric ceramic layer and said magnetic layer contains a glass having a softening point of 800.degree. C. or lower, and said dielectric ceramic layer and said magnetic layer are monolithically sintered at a temperature of 1,000.degree. C. or lower. The LC composite component is free from generation of cracks and degradation in characteristics, and is thereby highly reliable.

Abstract: A laser trimmable electronic device (1) has a housing (2) and a partially enclosed component (3) at least partially enclosed inside the housing (2) and electrically coupled to external connector terminals (4,5). The device (1) has a laser trimmable component (6) electrically coupled the external connector terminals (4,5), wherein at least part of the trimmable component (6) is mounted to an outer surface (7) of the housing (2).

Abstract: One embodiment of the invention includes a transformer that is at least partially formed on a substrate. The transformer is for electrical isolation and signal filtering. The transformer includes the following elements. A portion of the substrate has two holes through the substrate. A ferrite core is formed in a loop through the two holes. A primary winding is made of a first metal trace. The first metal trace is formed in a spiral around one hole. The first metal trace has at least two primary terminals acting as an input to the transformer. The transformer also includes a secondary winding. The secondary winding is made of a second metal trace. The second metal trace is formed in a spiral around the other hole. The second metal trace has at least two secondary terminals acting as an output from the transformer.

Abstract: A planar filter connector is disclosed for the transmission of signals to be passed in and out of an EMI shielded enclosure. The EMI enclosure has walls the free ends of which are provided with an electrically conductive, resilient gasket. The filter connector is located on a conductive pad on a printed circuit board and is positioned under a portion of one of the walls, the gasket being depressed to accommodate the filter connector. The connector consists of a planar conductor surrounded by high dielectric material and further surrounded by two planar metallization layers. One metallization layer is in electrical contact with the gasket and the other metallization layer is in contact with the conductive pad. Shielding through the connector is maintained by the capacitance created between the conductor and each of the metallization layers.

Abstract: Capacitive coupling assembly (60) securable about a shielded connector (10), for isolating the connector shell (14) from a conductive panel (4) after mounting. Coupler (60) includes a dielectric member (61) secured between front and rear conductive sheets (62, 63), and includes a plurality of capacitors (72) held between the sheets and electrically engaged therewith. The dielectric member (61) includes a flange (67) that insulates the connector shell (14) from front conductive sheet (62) and the panel (4) at cutout (5). Front sheet (62) engages the panel (4), and rear sheet (63) engages the connector shell (14) at spring arms (78).

Abstract: An LC filter including a substrate having a magnetic and dielectric material. The LC filter includes inductors having two spiral structures arranged so that magnetic fluxes generated at the insides of the spiral structures are parallel and in mutually reverse directions. Also included are plane plate capacitors between the two spiral structures.

Abstract: A phase shifter in which the change in phase changes with changes in temperature. The phase shifter includes a plurality of capacitors and inductors connected in series relation to form a filter network. Each of the capacitors has a dielectric material with a temperature coefficient so that the capacitance of the capacitor varies with temperature. Each of the inductors has a ferrite material which has a temperature coefficient so that the inductance of the inductor varies with temperature. The temperature coefficients of the dielectric material of the capacitors and the ferrite material of the inductors have the same sign, i.e, either negative or positive, and preferably are of the same value.

Abstract: A capacitor (14) is disposed in, for example, a ferrite shell (12). A winding (20) is formed around the shell, thereby providing an inductive component. Additional windings may be provided to form a transformer. In combining the two components into a unitary package, a space savings is realized, and assembly efficiency is increased.

Abstract: Differential filters for removing both normal-mode and common-mode noises are provided. A first-order differential low pass filter is composed of a first resistor connected between a first input terminal and a first output terminal, a second resistor having the same resistance value as the first resistor and connected between a second input terminal and a second output terminal, a first capacitor connected between the first output terminal and a reference potential, a second capacitor having the same capacitance value as the first capacitor and connected between the second output terminal and the reference potential, and a third capacitor connected between the first output terminal and the second output terminal.

Abstract: One embodiment of the invention includes a transformer that is at least partially formed on a substrate. The transformer is for electrical isolation and signal filtering. The transformer includes the following elements. A portion of the substrate has two holes through the substrate. A ferrite core is formed in a loop through the two holes. A primary winding is made of a first metal trace. The first metal trace is formed in a spiral around one hole. The first metal trace has at least two primary terminals acting as an input to the transformer. The transformer also includes a secondary winding. The secondary winding is made of a second metal trace. The second metal trace is formed in a spiral around the other hole. The second metal trace has at least two secondary terminals acting as an output from the transformer.

Abstract: A chip-type electronic component comprising at least one electronic component element which is mounted on a substrate. The electronic component element is provided on its upper portion with a flat surface which can be engaged by a suction nozzle.

Abstract: An LC element for use with a semiconductor device features excellent attenuation characteristics. The element includes a pn junction that has a predetermined shape and which is formed near the surface of a semiconductor substrate. The predetermined shapes include a spiral shape, a meander shape, a straight shape, and a curved shape. An inductor electrode is formed on the pn junction, and the pn junction is reverse biased with a specified voltage to form a distributed capacitor having a desired capacitance. One of the p and n layers functions as an inductor. The element is easily manufactured and requires minimal assembly, and may also be integrally formed as part of an IC or LSI device.

Abstract: A method of manufacturing a pi filter (24) includes a ferrite sleeve (26) providing an inductance coating the sleeve with a dielectric material (36) and plating (28-34, 38) to define spaced capacitive regions (R) on the sleeve with a signal conductor (18) soldered (S) to the inside plating (28) of the sleeve and a ground circuit (22) soldered (S') to the outside of the sleeve with the platings serving as electrodes for capacitances C of the filter. Multiple filters (24) are taught in use in an electrical connector (10).

Abstract: A plurality of inductors are formed by connecting linear patterns formed in different surfaces of a substrate respectively by means of holes, forming a plurality of electrically neutral surfaces in areas not including the linear patterns on different surfaces of the substrate, and furthermore by forming electrically neutral holes connecting the electrically neutral surfaces to each other at positions between the plurality of inductors to affect the coupling between inductors.

Abstract: A low pass filter including a number of different filter sections each having two input and two output terminals as well as a common terminal. Each filter section includes first and second resistors connected in series between respective first and second input terminals and first and second output terminals. Each of the resistors is formed by depositing a pattern of resistive material over a conducting plate with an intervening dielectric layer to provide a distributed capacitance between the resistive pattern and the conductive plate. Resistive elements are connected between at least one combination of (1) each of the conducting plates to the common terminal and (2) the conducting plates. A resistor is connected between the output terminals of at least one of the filter sections. The filter sections are cascade connected such that the output terminals in one section are connected to the input terminals of the next.

Abstract: A bulkhead mounting plate for EMI filter units formed along three of its edges into alternating fingers. The fingers can grip the inside and outside surfaced of an edge port or a notch in a box. The plate is shaped by a right angle bend of a fourth edge and perforated with precision mounting holes appropriate to any specified application. Fingers on the mounting plate are dimpled to concentrate spring pressure between them and the box to improve the efficiency of electrical contact of the filter to be mounted on the plate.

Abstract: A ground conductor and a signal conductor are provided in an insulating magnetic body respectively. The insulating magnetic body is a compound member that combines ferromagnetic metal particles and an insulating resin. A signal transmission element, a connector or a circuit board with high frequency stopping and low pass characteristics which will ensure reliable absorption of high frequency components in the high frequency range, can be provided.

Abstract: An earth electrode and a spiral pattern electrode are formed on both surfaces of a dielectric plate. One end of the pattern electrode is connected to the earth electrode. The width of the pattern electrode is made narrow in proportion to going from one end toward the other end. An area ratio S2/S1 is 0.15 or more when defining an area of the pattern electrode as S1, and an area of center portion where the pattern electrode is not formed as S2. A take-out electrode is drawn out from the pattern electrode with a distance from the one end of the pattern electrode. A chip type filter is manufactured by forming plural pattern electrodes on the dielectric plate, and coupling the pattern electrodes electromagnetically.

Abstract: A planar filter, in particular for multiple-pole plug connectors (plugs or counterpart plugs) disposed in a housing making a ground connection, for signal lines carrying electronic signals, includes a substrate and a number of closely spaced capacitors corresponding to the number of signal lines and being disposed on the substrate. The capacitors are formed of one common ground electrode being substantially continuous at least in the peripheral region of the substrate, individual signal electrodes each being provided for one of the signal lines and being insulated from the others, and a dielectric layer between them. The substrate has openings formed therein each for one of the signal lines. The signal electrodes each extend to or into one of the openings and are connected there to one of the signal lines. Each of the capacitors is formed of a series circuit of two substantially equal-size individual capacitors forming a capacitor pair.

Abstract: A noise filter including semi-conductor ceramics having voltage non-linearity characteristics. End surface electrodes are formed on a pair of opposing end surfaces of the semi-conductor ceramics and side surface electrodes are formed on a pair of side surfaces thereof. A first inner electrode is formed inside the semi-conductor ceramics having one end surface electrically connected to one of the end surface electrodes. A second inner electrode is formed inside the semi-conductor ceramics so as to be overlapped with the first inner electrode and separated therefrom by a ceramic layer. Both end surfaces of the second inner electrode are electrically connected to the pair of side surface electrodes. At least one resistance layer is embedded in the semi-conductor ceramics so that both end surfaces of the resistance layer are electrically connected to the pair of end surface electrodes.

Abstract: A distributed element filter member (10) comprises a semi-conductor member (12) having a composite dielectric layer (24) disposed on and secured to a first major surface (16) of the member (12), the layer (24) being comprised of a polymerized dielectric material made of either barium titanate or strontium titanate particles in various ranges of mixture; a conductive layer (34) is disposed on portions of the dielectric layer defining an outer ground conductor and an inner conductive layer (36) is disposed on a second major surface of the semi-conductor member defining a signal conductor. The polymer utilized may be selected from an aqueous solution containing acrylic styrene as a copolymer or a solid polyester dissolved in carbitol acetate, or a solid bisphenol A-based epoxy resin dissolved in butyl carbitol acetate with various mixtures of barium or strontium titanate utilized. A filter (12') embodiment includes three layers of polymerized material.

Abstract: An LC filter is provided which includes a first conductive sheet, a first dielectric sheet laminated on the first conductive sheet, a second conductive sheet laminated on the first dielectric sheet, a second dielectric sheet laminated on the second conductive sheet, a third conductive sheet laminated on the second dielectric sheet, and a third dielectric sheet laminated on a third conductive sheet formed as an integral body which has the first, the second and the third conductive sheets and the first, the second and the third dielectric sheets, are coiled. The first and the second conductive sheets are respectively provided with input terminals and output terminals.

Abstract: Three coil electrode patterns are formed on one surface of a plate containing of a dielectric material. These coil electrode patterns are formed in loop shape, and are disposed in a magnetically connecting state with respect to each other. An input/output terminal pattern and an earth terminal pattern are drawn out from each of the two coil electrode patterns which are disposed toward the end portions of the plate. The input/output terminal pattern and the earth terminal pattern are disposed at a distance for each other so as to provide a predetermined impedance. An earth electrode pattern is drawn out from the center coil electrode pattern. An earth electrode pattern is formed opposite the coil electrode patterns with the plate between them. Earth terminal patterns are formed to the earth electrode pattern. The earth terminal patterns of the earth electrode pattern are connected to the earth terminal patterns of the coil electrode patterns.

Abstract: An integrated-distributed-inductive-capacitive network (100) having a high dielectric electronically-tunable semiconductor integrated capacitor. The network (100) also includes a conductive layer (126) formed on the high dielectric semiconductor integrated capacitor, to provide the distributed resistance of the network (100). External contact to the network (100) is provided via a plurality of contact terminals (122A and 122B) which are coupled to the conductive layer (126).

Abstract: A laminated LC element comprises a laminate including a plurality of bonded insulating layers, a first conductor including conductive elements which continuously extend around the insulating layers so as to form a coil having a predetermined number of turns; and a second conductor including second conductive elements which extend around the insulating layers, facing the first conductor via said insulating layers, and producing a capacitance with the first conductor. The LC element can eliminate firmly noises from external sources.

Abstract: A case has parts storage openings through a top plane. Terminals protrude above the plane and extend downward through the case to a bottom plane, where they are bent to conform to the bottom plane. Interconnections of the terminals in the bottom plane provide the wiring pattern necessary for the creation of an LC filter. LC combination parts are made using a coil wound on a coil support with a capacitor secured to the top surface of the coil support. The coil part of the LC combination parts are inserted into the parts storage openings of the case, to secure the coils rigidly in place. The coils and capacitors are affixed to the terminals above the top plane. The resulting rigid support of the LC combination units provides stable and accurate filter characteristic in a compact package. The interconnections of the terminals in the bottom plane permits observation of the connections to permit manual inspection or the use of pattern recognition hardware and software for robotic sorting and assembly.

Abstract: An LC filter is provided which includes a first conductive sheet, a first dielectric sheet laminated on the first conductive sheet, a second conductive sheet laminated on the first dielectric sheet, a second dielectric sheet laminated on the second conductive sheet, a third conductive sheet laminated on the second dielectric sheet, and a third dielectric sheet laminated on a third conductive sheet formed as an integral body which has the first, the second and the third conductive sheets and the first, the second and the third dielectric sheets, are coiled. The first and the second conductive sheets are respectively provided with input terminals and output terminals.

Abstract: An electronic device is suggested which comprises a signal emitting circuit part (1) and a signal processing circuit part (4), at least one line for supplying the signal processing circuit part (4) with operating current and/or at least one signal input line (6) and/or at least one signal output line being guided to the signal processing circuit part (4) from an external circuit. The device includes at least one filter circuit (7) which is connected to the signal processing circuit part (4) and inserted into the signal line (6). The filter circuit (7) comprises additional damping elements for the associated line (6) for damping interference voltage induced by of external high-frequency fields. The amplitude of the interference voltage is greater, preferably substantially greater, than a linear control range of circuit elements of the signal processing circuit part (4). Damping elements and filter circuits are monolithically integrated together with the signal processing circuit part (4).

Abstract: A high percentage bandwith microwave filter network, according to an embodiment of the present invention, comprises a T-network of capacitors implemented with thin-film techniques by applying a groundplane to one side of an alumina substrate and a first plate to the other side. A silicon nitride dielectric layer having a high density of capacitance is deposited over the first plate, and then a second and third capacitor plate are deposited on the dielectric over the first plate.

Abstract: An RF circuit which may be for example a high pass filter, low pass filter, phase shifter, bandpass filter, termination network, bias network, or series or parallel resonance circuit includes at least one strip conductor coiled about a region and an outer or ring strip conductor disposed about a periphery of the at least one coiled strip conductor and coupled to said at least one coiled strip conductor through a dielectric. Parasitic capacitance between the coiled conductor and outer or ring conductor provide capacitor elements for the circuit.

Abstract: A method of designing a .pi. type LC filter includes laminating dielectric layers on top and bottom sections of a magnetic material layer, forming a first external electrode and a second external electrode on each end of the laminated body, forming a third external electrode at a center section of the laminated body, forming an inductor by at least one conductor line within the magnetic material layer, connecting one end of the conductor line to the first external electrode and the other end thereof to the second external electrode, and forming a first capacitor composed of a parallel capacitor electrode within the top dielectric layer. One of the parallel capacitor electrodes is connected to the first external electrode and the other is connected to the third external electrode. Additionally, a second capacitor is formed composed of a pair of parallel capacitor electrodes within the bottom dielectric layer.

Abstract: An inductive coupling device for external circuitry to pass electric currents therethrough via inductively coupled electrodes, comprises a monolithic, dielectric, ceramic block made from a multiplicity of stacked dielectric ceramic plates or layers all bonded together. First and second flat rectangular Z-shaped electrodes are embedded in the block between the ceramic layers and bonded thereto. The electrodes are spaced apart by one dielectric layer and generally overlap at least in part for effectively coupling to each other. The block also carries electrically conductive grounding films or layers bonded to the underside of the top and bottom dielectric layers of the block. These films are coupled to adjacent ones of the Z-shaped electrodes. The block may be rectangular in configuration. Conductive stripes on lateral and end faces of the block contact ends of the Z-shaped electrodes and ends of the grounding films and serve as terminals for connecting external circuitry thereto.

Abstract: A noise filter of a monolithic type in which a common electrode is formed in a sintered body having varistor characteristics so as to extend from a first portion to a second portion of side surfaces of the sintered body, and at least one through electrode is formed in a position at a height spaced apart from the common electrode through a sintered body layer in the direction of thickness so as to extend from a third portion to a fourth portion of the side surfaces of the sintered body and to intersect the common electrode.

Abstract: A laminated LC element comprises a laminate including a plurality of bonded insulating layers, a first conductor including conductive elements which continuously extend around the insulating layers so as to form a coil having a predetermined number of turns; and a second conductor including second conductive elements which extend around the insulating layers, facing the first conductor via said insulating layers, and producing a capacitance with the first conductor. The LC element can eliminate firmly noises from external sources.

Abstract: A monolithically realizable harmonic trapping circuit that is a shunt connected series-resonant inductor-capacitor combination which has a resonant frequency designed to coincide with an undesired harmonic frequency of a desired fundamental frequency signal.

Abstract: A laminated chip-type LC filter for use as a noise filter is obtained by carrying out the following steps: dielectric layers are laminated on the top and bottom of a magnetic material layer, forming an inductor portion by providing conductive lines inside the magnetic material layer and forming capacitors by providing at least two layers of parallel internal electrodes inside both of the dielectric layers. External electrodes are provided at both ends of the inductor portion. Intermediate external electrodes are provided at both lateral sides in the middle part of the dielectric layers and the magnetic layer. The inductor portion is connected to the external electrodes. The internal electrodes are connected to the intermediate external electrodes and to the external electrodes, respectively.

Abstract: A 3-terminal capacitor includes a wound unit which includes first and second longitudinal insulation sheets having substantially the same length which are laminated. First and second conductors are respectively formed on corresponding main surfaces of the first and second insulation sheets, so that one of the insulation sheets is sandwiched between the two conductors. The first conductor is longitudinally formed with substantially the same length as the first insulation sheet, and the second conductor is formed to be sufficiently shorter than the second insulation sheet. When the first and second insulation sheets are wound together with the first and second conductors to form the wound unit, two first terminals fixed on the first conductor at a predetermined interval and a second terminal fixed on the second conductor are exposed outside the wound unit.

Abstract: A multilayer circuit board (200) providing a feedthrough filter having metallized via (234) having input and output ports (232, 226) which are coupled to metallized areas (206, 214). Each of the metallized areas (206, 214) being opposed by ground planes (202, 210, and 218) which are separated from the metallized areas (206, 214) by dielectric layers (204, 208, 212, and 216) forming a reactive coupling between the metallized areas (206, 214) and the ground planes (202, 210, and 218). The multilayer circuit board as employed in the present invention, may be advantageously utilized in a variety of applications where multilayer circuit boards require attenuation of unwanted RF signals.

Abstract: A unitary composite electronic component having both a filter function and a surge voltage absorption function is arranged to have a varistor laminated body laid on top of an inductor laminated body and a capacitor laminated body, or at least one of them, and is baked so as to be integral in order to construct a laminated body. The unbaked varistor laminated body is provided with varistor electrodes, and the unbaked inductor laminated body is provided with an inductor conductive line and the unbaked capacitor laminated body is provided with capacitor electrodes, respectively. The above-described laminated body is provided at the sides thereof with external electrodes for properly connecting the above-described varistor electrodes with the inductor conductive line and the capacitor electrodes to obtain a composite electronic component having both a filter function and a surge voltage absorption function.

Abstract: This invention relates to a hermetically sealed electronic component package and method for making the package. In one embodiment of the invention, the electronic component is mechanically and electrically attached to the package by heating rings of brazing material. In another embodiment of the invention, an insulative, inorganic preform is heated to mechanically attach the electronic circuit within the package housing. The package is then hermetically sealed by mounting a preform within an electronic component package and heating the combination to a second predetermined high temperature to cause the preform to flow.

Abstract: An LC filter having electrode layers formed on opposite surfaces of a dielectric substrate. This filter includes a line electrode formed on one surface of the dielectric substrate. The line electrode extends from one electrode layer along outer edges of other electrode layers.

Abstract: A distributed constant type noise filter and method of making same is provided. The filter includes a first foil conductor disposed to conduct electrical current with first and second lead wires connected near each end thereof, a second foil conductor disposed to be connected to ground potential having a third lead wire connected near one end thereof, and a plurality of dielectric sheets disposed between said first and second foil conductors. This sandwich is wound generally into a tubular form with said first and third lead wires being close to each other and shifted by approximately 1/4 to 3/4 of a turn. The second lead wire is arranged substantially in-line with said first and third lead wires after the tubular wound filter is compressed into substantially an elliptical shape. Alternately, the sandwich is wound generally into a tubular form with said third lead wire being close to said first lead wire but separated therefrom by substantially 2.5% of the distance between said first and second lead wires.

Abstract: The present invention relates to a filter device for suppressing radio-frequency interferences on a plurality of pairs of transmission lines. The device includes a filter function for each pair of transmission lines. The filter function comprises an inductance in series with a respective transmission line of the transmission-line pair, and a capacitance connected between this line and around. In accordance with the invention, the filter functions are constructed, one upon the other, on a carrier (1) which includes along two mutually opposing sides (2a, 2b) rows of connector pins (3a, 3b) for the various pairs of transmission lines. Each filter facility includes two pairs of capacitor layers (7a, 7b, 14a, 14b) with intermediate insulation (8, 15), and two inductance layers (9, 13) having conductive paths (17, 19) with intermediate ferrite layers (11).

Abstract: An LC filter comprises a ceramic laminate which has at least one dielectric part defining an exposed surface and at least one magnetic part integrated with the dielectric part in a layered manner. The ceramic laminate is provided with at least one through hole which has a first opening positioned on the exposed surface of the dielectric part and commonly passes through both of the dielectric part and the magnetic part. A connector pin is inserted in the through hole while a first electrode of a capacitor is formed on the exposed surface in a peripheral region of the first opening to be electrically connected with the connector pin. A second electrode of the capacitor is provided to be opposite to the first electrode through a dielectric member forming the dielectric part except for a peripheral region of the through hole, so that the second electrode is extracted toward the exterior of the ceramic laminate as a grounded electrode.

Abstract: A fixing frame for a flat filter unit having a flat substrate with a pattern of passages for the contact elements of a connector. The fixing frame comprises a metal base plate having a pattern of passages corresponding to said filter unit, and being provided at two opposite edges with upright sides which each merge into guide grooves for accomodation between them of said flat filter unit. The fixing frame being provided with spring-loaded contact elements for contacting the housing or shielding of a connector.

Abstract: A noise filter including a wound unit which is composed of two film sheets one of which is laid on the other. On one film sheet, two first conductors are formed, and a second conductor is formed on the other film sheet. Four terminals are fixed to the first conductors in such a manner that one pair of the terminals are fixed to one of the first conductors and the other pair of terminals are fixed to the other first conductors. By laying one of the film sheets on the other film sheet and winding the same together with the first and second conductors, each of the first conductors opposes the second conductor, whereby distributed capacitance (C1) is formed between each of the first conductors and the second conductor. The capacitance is connected in series between the first conductors via the second conductor. Cores are inserted in a hollow portion of the wound unit, whereby inductances (L1, L2) are formed by the first conductors, respectively.