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 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 which can be connected to a balanced circuit without going through a balun, and a communication device which includes the nonreciprocal circuit device. An isolator generally includes a circuit board, a lower metal case, a center electrode assembly, an upper metal case, a permanent magnet, a resistor, and matching capacitors. The circuit board comprises an insulating substrate, such as a glass epoxy substrate or a ferrite substrate, on which are formed an unbalanced input terminal, balanced output terminals (i.e., differential output terminals), a grounding terminal, and a half-wave line which interconnects the balanced output terminals.

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 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 high frequency dielectric filter device having a plurality of coaxial dielectric resonators arranged in parallel with each other wherein a portion having no conductor layer is formed on an outer peripheral surface close to a short-circuit end surface of a dielectric substrate in the direction diagonal to through-holes for the dielectric resonators, thereby easily and simultaneously obtaining polarization and coupling between the coaxial dielectric resonators with each other, that is, obtaining inter-stage coupling and an attenuation pole in the high band side of a center frequency.

Abstract: A compact and highly effective dielectric duplexer comprises a dielectric ceramic block and a plurality of resonators arranged in a direction in the dielectric ceramic block, a half of the resonators constituting a transmitting section T, the remaining half of the resonators constituting a receiving section R, wherein an antenna terminal pad is capacitively coupled to the innermost resonator of the transmitting section T and to the innermost resonator of the receiving section R located adjacent to the innermost resonator to eliminate the use of a wave-dividing resonator, whereby the dielectric ceramic block can be dimensionally reduced in the direction along which resonators are arranged and hence it is adapted to down-sizing.

Abstract: A dielectric filter having a plurality of dielectric coaxial resonators provided on a dielectric ceramic block, which is capable of equalizing the resonance frequencies of all the dielectric coaxial resonators with ease, and a method for adjusting the resonance frequency of the dielectric filter, in which one or more counterbores is provided for adjusting the substantial resonance frequency of each of the dielectric coaxial resonators or for coping with a tendency toward any deviation of the resonance frequency based on the structure of the dielectric filter. Each counterbore has a diameter larger than that of an inner conductor of each of the dielectric coaxial resonators.

Abstract: There are provided a dielectric filter that shows a large effective bandwidth and a method of regulating the frequency bandwidth of a dielectric filter in order to achieve a large effective bandwidth, in which the dielectric filter comprises a dielectric ceramic block provided with three or more resonators arranged in parallel with each other and formed by respective resonant conductors, capacitive electrodes are provided at a position close to an electrically open-circuit end surface on one of four lateral surfaces of the dielectric ceramic block to respectively lie over the adjacently disposed resonant conductors, and a shield electrode provided on the lateral surface is partly removed at a position bordering the open-circuit end surface where the capacitive electrodes are located in order to form an insulation gap having a predetermined width.

Abstract: A dielectric filter device whose input and output coupling capacities can be regulated by modifying the diameters of the open end portions of laterally arranged resonance bores disposed adjacent respective input/output terminals so that any standardized printed circuit board may be used with it without altering the dimensions of the input and output terminals and hence the production control procedures for manufacturing such printed circuit boards may be simplified. The diameters of the open end portions of the laterally arranged resonance bores of the device located adjacent the respective input and output terminals are modified to alter the surface areas of the corresponding inner conductors arranged therein.

Abstract: A dielectric filter is adapted to show a specified coupling capacitance without inadvertently affecting the resonance frequency, in which a dielectric ceramic block is provided with two or more than two resonant conductors arranged in parallel, a conductive circuit film is formed on the open-circuit end surface of said dielectric ceramic block and electrically separated from the inner conductive films of the resonant conductors by arranging insulation gaps therebetween to capacitively couple the conductive circuit film and the resonant conductors by way of the insulation gap.

Abstract: A dielectric filter includes a dielectric ceramic block provided with three or more than three linearly arranged resonators. Coupling through bores are arranged between adjacent ones of the resonators and input/output pads are arranged vis-a-vis the respective outermost resonators for capacitive coupling. There are provided a pair of outer coupling electric paths extending from the respective input/output pads onto the open-circuit end surface which are arranged in juxtaposition with the respective outermost resonators with a coupling gap provided therebetween. A pair of inner coupling electric paths extends from the respective input/output pads onto the open-circuit end surface and are arranged between the outermost resonators in juxtaposition with the inner resonator or the respective inner resonators adjacent to the outermost resonators.

Abstract: In a dielectric filter comprising a dielectric block provided with a plurality of through holes bored from the top all the way to the bottom thereof and arranged in parallel with each other, the peripheral walls of the through holes being coated with an inner conductor to produce so many dielectric coaxial resonators, a non-short-circuiting section is formed on the top of the dielectric block, by cutting out at least one of the edges of the top running in parallel with the direction of linking the resonators. With this arrangement, an interstage coupling section can be formed accurately and easily regardless in the dielectric filter if a number of dielectric filters being manufactured on a mass production basis show positional displacements and/or dimensional deviations from the specified values in the manufacturing process.

Abstract: A dielectric filter comprises transmission paths each of which is coupled to an associated input/output conductor provided in a dielectric ceramic block, and may be operated as capacitance means or inductance means, in which an intended center frequency can be obtained by suitably setting the lengths of the transmission paths without changing the length of each resonance conductor.A method of adjusting the center frequency of a dielectric filter in which the center frequency of the dielectric filter is adjusted to a desired value by changing the length of each transmission path located on the top surface having a relatively wide area of the dielectric ceramic block, which may behave as capacitance means or inductance means, and the adjusting operation becomes easy and production costs can be reduced.

Abstract: A dielectric filter comprising a dielectric ceramic block which has at least two through bores longitudinally extended in parallel with each other each of which is provided with a resonant conductor, and two auxiliary through bores each being laterally extended from the associated through bore to both lateral side surfaces of the dielectric ceramic block and being provided with an inner conductive film on the inner peripheral surface thereof, one end of the inner conductive film in each auxiliary through bore is separated from a shield electrode provided on the outer surface of the dielectric ceramic block so as to form an open circuit end.

Abstract: A dielectric filter comprising a dielectric ceramic block in which two or more than two through bores are provided in parallel with each other so that they extend from a first end surface to a second end surface of the block. Each through bore has an inner surface covered with an electrically conductive layer. Auxiliary through bores are provided which extend from the associated one of the through bores to one of four lateral side surfaces of the block. Each auxiliary through bore has an inner surface covered with an electrically conductive layer and an opening at the respective one lateral side surface which is surrounded by an electrically non-conductive section. An electrically non-conductive connecting section is provided for connecting the electrically non-conductive sections, thereby providing a large bandwidth. There is also provided a method of regulating the frequency bandwidth of a dielectric filter in order to achieve a large bandwidth.

Abstract: A dielectric filter comprising a rectangular parallelepipedic dielectric ceramic block provided with a pair of resonance holes vertically bored therethrough, a conductive layer formed on the entire surface of the ceramic block except the top side of the block, a pair of input and output terminals arranged on a lateral side of the ceramic block and, additionally, coupling capacitance regulating or trimming electrodes arranged on the top of the ceramic block, each of said trimming electrodes extending from one of said input and output terminals to the vicinity of the opening of the corresponding resonance hole on the top side so that the coupling capacitance of the gap separating the input/output terminal and the resonance hole can be regulated by appropriately trimming the trimming electrode.

Abstract: A microwave strip line filter has a pair of dielectric substrates being stacked and bonded to each other, which are similar in pattern but different in dimension. The dielectric substrates are bonded to each other with spots of bonding agent applied to resonant electrodes on one of the dielectric substrates, thereby preventing the electric characteristic from being adversely affected by bonding agent when the dielectric substrates are superimposed and bonded to each other. The dielectric substrates are made of ceramic materials having relative dielectric constants in order to easily and exactly obtain various desirable resonant frequency characteristics by using resonant electrodes having the same pattern.

Abstract: A method of adjusting a frequency response in a filter device of a three-conductor type having a pair of stacked dielectric substrates with a plurality of strip-line resonator conductors being sandwiched therebetween, wherein the frequency adjusting of the filter is performed by partially removing the external ground conductor layer on the peripheral surface of each substrate at a region corresponding to a longitudinal side edge of each resonator conductor layer.

Abstract: A fixing device used for a distributor which includes a cylindrical portion, through which a driving shaft is pierced, and a flange for fastening the distributor to the engine with a bolt. The fixing device consists mainly of a pair of container-like covers to be faced to each other with an opening portion thereof for being fitted, one into the other, to untouchably cover the head of the fastening bolt. Both are provided with a bottom plate and a side wall and one of the covers is further provided with a through-hole in the center of the bottom plate for being pierced by the fastening bolt. Both covers are further given necessary dimension to be mutually fitted, one into the other, and accommodate the head of the bolt in the enveloped space between the both covers. Either one cover is provided with engaging tongues for engaging with engaging portion(s) formed in the side wall of the other cover.