Abstract: A common mode filter suppressing a reflection of a common mode noise and sufficiently removing the common mode noise of 2 GHz or less includes: a signal coil spirally formed in a dielectric layer of a multilayer structure, and serially inserted and connected to one of the differential signal lines; a signal coil inserted and connected to the other differential signal line and formed in the dielectric layer so as to face the signal coil through the dielectric layer; a control coil formed in the dielectric layer so as to be sandwiched between the first and second signal coils interposing the dielectric layer and wound in the same direction as the signal coil; and an embedded resistor connected to at least one of an outer peripheral end or an inner peripheral end of the control coil, thus forming a feedback loop circuit by the control coil and the embedded resistor.

Abstract: A common mode filter suppressing a reflection of a common mode noise and sufficiently removing the common mode noise of 2 GHz or less includes: a signal coil spirally formed in a dielectric layer of a multilayer structure, and serially inserted and connected to one of the differential signal lines; a signal coil inserted and connected to the other differential signal line and formed in the dielectric layer so as to face the signal coil through the dielectric layer; a control coil formed in the dielectric layer so as to be sandwiched between the first and second signal coils interposing the dielectric layer and wound in the same direction as the signal coil; and an embedded resistor connected to at least one of an outer peripheral end or an inner peripheral end of the control coil, thus forming a feedback loop circuit by the control coil and the embedded resistor.

Abstract: Series resistance Rs is connected in series between an input terminal 1 and an output terminal 3, and a resonant circuit 11 including an inductor L1 and a capacitor C1, and a resonant circuit 13 including an inductor L3 and a capacitor C3 are connected between the input terminal 1 and the output terminal 3, in parallel to the series resistance Rs. One end of a shunt resistance R1 is connected to a connection point P1 of the inductor L1 and the capacitor C1, and the other end is connected to a ground destination. One end of a shunt resistance R3 is connected to a connection point P3 of the inductor L3 and the capacitor C3, and the other end is connected to the ground destination.

Abstract: A first meander line 1A is formed on one surface of a first dielectric layer 9A, with one end as a signal input position, and the other end connected to a first termination resistance 5A, and a second meander line 1C facing the first meander line 1A is formed on a surface facing the first dielectric layer 9A, and the second meander line 1C is formed, with one end positioned at the other end side of the first meander line 1A as a signal output position, and the other end connected to a second termination resistance 5C, and a first conductor line 3A is formed on the side facing the first dielectric layer 9A, with one end connected to the signal input position and the other connected to the signal output position, and a dividing section in a middle of the first conductor line 3A is connected by a first series resistance 7A.

Abstract: A first meander line 1A is formed on one surface of a first dielectric layer 9A, with one end as a signal input position, and the other end connected to a first termination resistance 5A, and a second meander line 1C facing the first meander line 1A is formed on a surface facing the first dielectric layer 9A, and the second meander line 1C is formed, with one end positioned at the other end side of the first meander line 1A as a signal output position, and the other end connected to a second termination resistance 5C, and a first conductor line 3A is formed on the side facing the first dielectric layer 9A, with one end connected to the signal input position and the other connected to the signal output position, and a dividing section in a middle of the first conductor line 3A is connected by a first series resistance 7A.

Abstract: Series resistance Rs is connected in series between an input terminal 1 and an output terminal 3, and a resonant circuit 11 including an inductor L1 and a capacitor C1, and a resonant circuit 13 including an inductor L3 and a capacitor C3 are connected between the input terminal 1 and the output terminal 3, in parallel to the series resistance Rs. One end of a shunt resistance R1 is connected to a connection point P1 of the inductor L1 and the capacitor C1, and the other end is connected to a ground destination. One end of a shunt resistance R3 is connected to a connection point P3 of the inductor L3 and the capacitor C3, and the other end is connected to the ground destination.

Abstract: To sufficiently attenuate a common mode signal by passing an ultra-high speed differential signal through an ultra-high speed differential transmission line. A common mode filter comprises: a pair of conductive lines formed on a first dielectric layer to transmit a differential signal; a plurality of first divided floating grounds in a state of being separated from an external ground potential, and facing the conductive lines, with the first dielectric layer interposed between them, and formed by being divided into a plurality of numbers in a length direction of the conductive lines, and forming a distribution constant type differential transmission line for the differential signal, together with the conductive lines; and a first passive two-terminal network connected between the first divided floating grounds located at least at an input side or an output side of the first divided floating grounds, and the external ground potential.

Abstract: To pass an ultra high-speed differential signal and make it difficult to pass a common mode noise. Lumped—constant differential delay line DL is formed by arranging inductors Lo, being passive series elements, and capacitors Co, being passive parallel elements, in a differential four terminal network of a ladder shape composed of the passive series elements and the passive parallel elements arranged in differential lines 1 and 3. The lumped-constant differential delay line DL is composed of capacitors Co including two capacitors Co/2 and Co/2, or Co and Co equivalent to the aforementioned capacitors, having equal values, and connected in series. Inductors L1 to L4 for attenuating a common mode noise are connected between connection points of the capacitors Co/2 and Co/2 or Co and Co connected in series, and a ground potential, so that attenuation poles are formed for attenuating the common mode noise together with the capacitors Co/2 and Co.

Abstract: There is provided a common mode filter capable of allowing an ultrahigh speed differential signal to transmit and hardly allowing a common mode noise to transmit, comprising: a lumped-constant differential delay line DL formed by arranging inductors Lo, being passive series elements, and capacitors Co, being passive parallel elements, in a ladder-shaped differential four terminal network composed of the passive series elements and the passive parallel elements arranged in the differential lines 1, 3. In the lumped-constant differential delay line DL, the capacitors Co, being the parallel elements, are formed of two capacitors connected in series equivalent to each other and having same values with each other such as Co/2 and Co/2, or Co and Co.

Abstract: To obtain a satisfactory contact state in an ultra high frequency range with a low loss, in a contact probe device with an electronic component connected to a mounting substrate. Insulating substrate 1 has cuts 3 with narrow width formed from an outer peripheral end. Cylindrical electrodes 9 are made of a conductive material and have slits 9a extending in its axial direction. A plurality of cylindrical electrodes 9 are supported by the insulating substrate 1 in such a manner as being inserted into each cuts 3 so that the insulating substrate 1 is fitted into each slit 9a.

Abstract: To pass an ultrahigh speed differential signal and sufficiently attenuate a common mode signal on an ultrahigh speed differential transmission line. A pair of conductor lines 1A and 1B are formed on one side of a dielectric layer 3 in parallel to each other. A floating ground 5 is formed on the other side of the dielectric layer 3 so as to face the conductor lines 1A and 1B. The floating ground 5 is not connected to an external common ground 7 and is formed independently. A passive two terminal circuit CM1 composed of passive circuit elements is connected between a connection point 9 between the floating ground 5 and a common ground 7.

Abstract: There is provided a common mode filter capable of allowing an ultrahigh speed differential signal to transmit and hardly allowing a common mode noise to transmit, comprising: a lumped-constant differential delay line DL formed by arranging inductors Lo, being passive series elements, and capacitors Co, being passive parallel elements, in a ladder-shaped differential four terminal network composed of the passive series elements and the passive parallel elements arranged in the differential lines 1, 3. In the lumped-constant differential delay line DL, the capacitors Co, being the parallel elements, are formed of two capacitors connected in series equivalent to each other and having same values with each other such as Co/2 and Co/2, or Co and Co.

Abstract: To sufficiently attenuate a common mode signal by passing an ultra-high speed differential signal through an ultra-high speed differential transmission line. A common mode filter comprises: a pair of conductive lines formed on a first dielectric layer to transmit a differential signal; a plurality of first divided floating grounds in a state of being separated from an external ground potential, and facing the conductive lines, with the first dielectric layer interposed between them, and formed by being divided into a plurality of numbers in a length direction of the conductive lines, and forming a distribution constant type differential transmission line for the differential signal, together with the conductive lines; and a first passive two-terminal network connected between the first divided floating grounds located at least at an input side or an output side of the first divided floating grounds, and the external ground potential.

Abstract: To pass an ultra high-speed differential signal and make it difficult to pass a common mode noise. Lamped-constant differential delay line DL is formed by arranging inductors Lo, being passive series elements, and capacitors Co, being passive parallel elements, in a differential four terminal network of a ladder shape composed of the passive series elements and the passive parallel elements arranged in differential lines 1 and 3. The lumped-constant differential delay line DL is composed of capacitors Co including two capacitors Co/2 and Co/2, or Co and Co equivalent to the aforementioned capacitors, having equal values, and connected in series. Inductors L1 to L4 for attenuating a common mode noise are connected between connection points of the capacitors Co/2 and Co/2 or Co and Co connected in series, and a ground potential, so that attenuation poles are formed for attenuating the common mode noise together with the capacitors Co/2 and Co.

Abstract: To obtain a satisfactory contact state in an ultra high frequency range with a low loss, in a contact probe device with an electronic component connected to a mounting substrate. Insulating substrate 1 has cuts 3 with narrow width formed from an outer peripheral end. Cylindrical electrodes 9 are made of a conductive material and have slits 9a extending in its axial direction. A plurality of cylindrical electrodes 9 are supported by the insulating substrate 1 in such a manner as being inserted into each cuts 3 so that the insulating substrate 1 is fitted into each slit 9a.

Abstract: To provide an inductance element of a lumped constant type electromagnetic delay line which can easily be made as an ultra-small chip shape and obtain a preferable connection state at each section. Spiral-shaped inductors L0B, L4A, and L4B are formed on a first insulating substrate 15, and inductors L4A and L4B are connected in series. Spiral-shaped inductors L1, L3, and L5 are formed on a second and third insulating substrates 22 and 33. Spiral-shaped inductors L2A, L2B, and L6A are formed on a fourth insulating substrate 41, and the inductors L2A and L2B are connected in series. The first to fourth insulating substrates 15 to 41 are stacked on one another, and the inductors L0B to L6A are vertically connected. The inductors L2A and L2B, and L4A and L4B are divided into two portions in horizontal directions to form one section, and connected with positive coupling to the preceding and the following sections not divided in the horizontal direction.

Abstract: The size of the electromagnetic delay line is reduced by arranging chip capacitors in two rows in a staggered relationship along the lengthwise direction of a base board so that the overall length can be substantially reduced as compared to the conventional structure in which the chip capacitors are arranged in a single row. In particular, the height of the profile of the package for the electromagnetic delay line can be substantially reduced as compared to the comparable conventional ones. Furthermore, this electromagnetic delay line can cover a wide range of delay time while maintaining a same size and configuration, and offers stable and desirable properties. The present invention also offers an electric advantage in that the bridging capacitance is produced while the parallel capacitance is reduced. This contributes to the improvement in the performance of the electromagnetic delay line.

Abstract: A lumped constant type electromagnetic delay line employs an inductive device consisting of a plurality of turns of electroconductive wire in combination with chip capacitors connected to a plurality of taps provided in the inductive device so as to form a ladder circuit consisting of a plurality of delay circuit sections. The coil wire ends and the taps of the inductive device of the present invention are all twisted and extended in the same direction, and are all provided with a uniform and sufficient rigidity. Therefore, the process of connecting these taps and coil wire ends to the corresponding electrodes is simplified, and is therefore made better adapted for automatization. During the process of manufacture, a series of inductive devices can be fabricated as a continuous process of winding a coil wire around an elongated bobbin, and all the taps and coil wire ends are laterally extended and twisted in the same manner so that the entire process is significantly simplified.

Abstract: By appropriately determining the dimensions and positional relationships of the terminal pieces of an electronic component such as an electromagnetic delay line, the terminal pieces are capable of conducting super high speed signals without unduly attenuating or reflecting them. A signal terminal piece and a ground terminal piece situated in a common plane so as to define a gap G filled with dielectric material therebetween form an impedance line having a desired characteristic impedance. By selecting the gap from a range between 0.1 mm and 0.6 mm, it is possible to obtain a normally desired characteristic impedance when the dimensions of the terminal pieces and related parts are set to practical values. When a pair of ground terminal pieces are arranged on either side of a signal terminal piece, each of the gaps may be selected from a range between 0.1 mm and 1.0 mm when the gaps are air gaps, and from a range between 0.2 mm and 1.5 mm when the gaps are filled with dielectric material such as epoxy resin.

Abstract: A switching device for super high frequency ranges comprising a common fixed contact and a pair of selectable fixed contacts, and moveble contacts which are slidable over them so as to selectively and electrically connect the common fixed contact to one of the selectable fixed contacts. A pair of buffer electrodes are placed between the common fixed contact and the selectable fixed contacts to reduce the electrostatic capacitance between the fixed contacts and reduce signal attenuation in super high frequency ranges. The buffer electrodes are electrically isolated without being connected to any external circuit and thereby reduce electrical capacitance produced between the common fixed contact and the selectable fixed contacts without creating excessive gaps therebetween. Such gaps would prevent smooth sliding movement of the moveable contacts.