167 results about "Interdigital capacitor" patented technology

The specification describes matched capacitor pairs that employ interconnect metal in an interdigitated form, and are made with an area efficient configuration. In addition, structural variations between capacitors in the capacitor pair are minimized to provide optimum matching. According to the invention, the capacitor pairs are interdigitated in a manner that ensures that the plates of each pair occupy common area on the substrate. Structural anomalies due to process conditions are compensated in that a given anomaly affects both capacitors in the same way. Two of the capacitor plates, one in each pair, are formed of comb structures, with the fingers of the combs interdigitated. The other plates are formed using one or more plates interleaved between the interdigitated plates.

An optical module includes a stem; a first lead pin and a second lead pin for receiving differential signals, the first and second lead pins penetrating the stem; a mount block fixed to the stem; a laser diode having a pair of electrodes; a submount mounted on the mount block and having a matching resistance, an interdigital capacitor, and a plurality of electrode patterns on a surface on the submount; and a first wire and a second wire electrically connecting the submount to the first and second lead pins, respectively. The laser diode is mounted on one of the electrode patterns on the submount and connected to another one of the electrode patterns on the submount by a third wire such that the laser diode, together with the matching resistance and the interdigital capacitor, forms an electrical circuit. The value of the matching resistance is smaller than an impedance value of a differential signal source supplying the differential signals minus the resistance of the laser diode.

Wireless strain and displacement sensors wirelessly monitor structural health and integrity, and are made by printing inductor-interdigital capacitor sensing circuits on a variety of substrates, including ceramic substrates, with thermally processable conductive inks. Sensors of the invention can be employed to detect strain and displacement of civil structures, such as bridges and buildings. The sensors include sensing elements that are mounted or printed on stiff, inflexible substrates, which prevent the sensing elements from bending, stretching, or otherwise warping when the sensor is strained. An interlayer between the sensing elements allows the sensing elements to move with respect to each other during application of strain. Thus, strain causes the sensing elements to move but not to deform, causing changes in sensor resonance that can be detected through wireless radio-frequency interrogation. Because the sensing elements do not change shape when under strain, the sensor can undergo millions of measurement cycles before breaking.

This invention relates to a super broad band plane micro-strip filter including: a front part, a rear part and an input/output port, in which, the front part includes: interdigital capacitor units, a uniform transmission line and a medium plate, the two interdigital units are set at both ends of the medium plate, the unform transmission line is set at the middle of the medium plate, the input/output port has two ports connected with the capacitors, the rear part includes: a non-uniform DGS unit, a slot structure unit and an earth unit, the non-uniform DGS unit includes 7 arrayed non-uniformly in an approximate equidifferent sequence, the slot structure has three sets loaded at both sides of the even DGS unit, which applies front and rear circuit structure to realize high pass and low pass filters and reduce areas of circuits.

The invention discloses a zero resonance unit-loaded broadband planar inverted-F antenna. The antenna comprises a top microstrip structure, a bottom dielectric substrate and an input/output port, wherein the top microstrip structure comprises a coplanar waveguide transmission line, an antenna main body, a feed line, a loading interdigital capacitor and a ground thin-wire inductor, wherein one end of the coplanar waveguide transmission line is connected with the input/output port and the other end is fed to the antenna main body through the feed line; one terminal of the antenna main body is provided with the loading interdigital capacitor and the ground thin-wire inductor; the ground thin-wire inductor is connected with a floor board; the loading interdigital capacitor, the ground thin-wire inductor and the antenna main body together form a zero resonance unit; and the top microstrip structure is arranged on the bottom dielectric substrate. By loading the zero resonance unit in a broadband planar inverted-F antenna, the problems of large area, complex machining and the like of the broadband planar inverted-F antenna are solved; therefore, the zero resonance unit-loaded broadband planar inverted-F antenna has the advantages that the size is small, the broadband is broad, the structure is simple, the broadband planar inverted-F antenna is easy to machine and the like.

The invention relates to a composite left-right-hand transmission line type narrow band wide-range frequency scan antenna, which comprises a plurality of antenna elements. The plurality of antenna elements are arranged adjacently in sequence, wherein each antenna element comprises a plane baseplate; a row of metal through holes arranged in periods are arranged at each of the upper side and the lower side of the plane baseplate; a gap is arranged at the center of the plane baseplate; and two interdigital capacitors which are of an interdigital shape are respectively distributed at two sides of the gap. With adoption of the composite left-right-hand transmission line type narrow band wide-range frequency scan antenna, scan at wide-angle scope in a narrower band can be realized.

The invention discloses a miniature lumped-element LTCC band-pass filter, and a spurious spikes suppressed vertically-interdigital capacitor and a spiral inductor which are employed by the LTCC band-pass filter. The band-pass filter includes a spurious spikes suppressed vertically-interdigital capacitor and a three-dimensional spiral inductor. The band-pass filter is characterized in that the filter is of an even-layer structure, the spurious spikes suppressed vertically-interdigital capacitor is connected with the three-dimensional spiral inductor on the top layer of the filter through a microstrip line, in the spurious spikes suppressed vertically-interdigital capacitor, open circuit ends of spacing fingers are connected through vertical through holes, and the capacitor is provided with defect structures. Aiming at 60MHz ultra-low center frequency, a miniature lumped-element 10-layer LTCC filter is provided, by using high impedance lines, miniaturization, high performance and reliability of the spiral inductor and the spurious spikes suppressed vertically-interdigital capacitor can be achieved.

The utility model relates to a variable interdigital capacitor network based on micro mechanical capacitive series switch, which comprises a plurality of interdigital capacitors and micro electromechanical swatches (MEMS); the number of the interdigital capacitor switched into the network is determined by controlling the make-and-break of the MEMS connected with the interdigital capacitors, so as to change the capacitance value of the whole network. The utility model is characterized in that: a GaAs substrate 1 serves as the substrate of the interdigital capacitors; a plurality of transmission lines 2 and a plurality of interdigital structures are arranged on the upper surface of the GaAs substrate 1; the GaAs substrate 1 is also the substrate of the micro mechanical capacitive series swatches; a plurality of transmission lines 4 and pull-down electrodes 7 are arranged on the upper surface of the GaAs substrate 1; a SiN medium layer 8 is arranged on the transmission lines 4-2 and the pull-down electrodes 7; an anchorage area 5 is arranged above the transmission lines 4-1 and connected with one end of the switch girder 6, enabling the switch girder 6 to suspend above the SiN medium layer 8.

The invention discloses an antenna and a mobile terminal, relates to the technical field of antennas, and aims to reduce the space of the antenna, increase the bandwidth of the antenna, and improve the efficiency of the antenna. The antenna comprises a first radiator and an interdigital capacitor, one end of the interdigital capacitor, far away from the first radiator, is provided with a feeding point, the other end of the interdigital capacitor is electrically connected with the first radiator, a free end of the first radiator is provided with a first grounding point, the first radiator bends to form a protruding structure, and the length of the first radiator satisfies a preset value.

The invention relates to an electrostatic comb resonator which comprises an upper anchor point, a lower anchor point, first interdigital capacitors, second interdigital capacitors, third interdigital capacitors, fourth interdigital capacitors, an upper elastic beam, a lower elastic beam, an oscillator mass block, a left anchor point and a right anchor point. The oscillator mass block comprises a left mass block and a right mass block. The electrostatic comb resonator is characterized in that the middle of the left side of the left mass block is sunken towards the right side of the left mass block to form a left groove, and the middle of the right side of the right mass block is sunken towards the left side of the right mass block to form a right groove; the first interdigital capacitors are arranged on the left side surfaces of the upper portion and the lower portion of the left mass block, and the second interdigital capacitors are arranged on the right side surfaces of the upper portion and the lower portion of the right mass block; the third interdigital capacitors are arranged at the left anchor point, and the fourth interdigital capacitors are arranged at the right anchor point; the first interdigital capacitors and the third interdigital capacitors are equidistantly configured in a crossed manner, and the second interdigital capacitors and the fourth interdigital capacitors are equidistantly configured in a crossed manner. The electrostatic comb resonator has the advantages that a potential hazard that the mass blocks are tilted to affect normal operation of the resonator is prevented, and accordingly a potential hazard that the mass blocks are tilted to affect the normal operation of the resonator in a manufacturing procedure is prevented.

An interdigital capacitor includes a first finger electrode structure and a second finger electrode structure. The first finger electrode structure has a first electrode and a plurality of first extending electrodes. The first extending electrodes are linearly disposed and arranged. The second finger electrode structure has a second electrode and a plurality of second extending electrodes. The second extending electrodes are linearly disposed and arranged. The second finger electrode structure interlaces with the first finger electrode structure. At least one pair of first coupling electrodes extend respectively from the neighboring first and second extending electrodes and are disposed between them.

The invention relates to the technical field of the capacitance sensor, especially to a surface strain detection device based on an elastic substrate and a filled interdigital capacitor. The strain detection device comprises an elastic substrate, a filled interdigital capacitor, and a coverage layer and is manufactured by using a die copy technology. The elastic substrate has elastic and flexible properties and can carry out compression, stretching and bending deformation with the surface strain of a to-be-measured object. The filled interdigital capacitor arranged on the elastic substrate is formed by two metal wires; one metal wire forms an interdigital structure, wherein the interdigital number and space of the interdigital structure can be selected according sensitivity demands; and the other metal wire in a snake shape is arranged in the middle of the interdigital structure to form a structure with filling. A capacitor structure is formed between the two metal wires. The coverage layer having the same material and dimension as those of the elastic substrate covers the elastic substrate and the filled interdigital capacitor and plays a role in protecting the filled interdigital capacitor. Because the strain detection device deforms with the strain of the to-be-detected surface, the capacitance value of the interdigital capacitor changes; and thus the surface strain can be obtained based on detection of the capacitance value.

The invention discloses a graphene annular loop fan-shaped loading patch-based implantable circularly polarized antenna. The radiation patch and ground plate of the antenna are both made of multilayergraphene films; since the multilayer graphene films are adopted to process the antenna, the performance of the antenna can be improved, loss is effectively reduced, and transmission efficiency is improved. Four fan-shaped loading patches are additionally arranged on an annular loop, and therefore, the design size of the antenna can be effectively reduced. Rectangular stubs which have the same size and are arranged in a staggered manner are additionally installed between the four fan-shaped loading patches, so that an interdigital capacitor structure is formed, and therefore, the resonance frequency of the implantable antenna is reduced. Conduction bands are slotted, and rectangular open-circuit protrusions are additionally adopted, and therefore, geometric perturbation is generated, and acircular polarization characteristic is generated. The size of the antenna is only 5.5*5.5*0.635mm<3>. The graphene annular loop fan-shaped loading patch-based implantable circularly polarized antenna has the advantages of wide frequency band, circular polarization, miniaturization, good anti-interference performance, good biocompatibility and the like. The antenna is suitable for a WMTS 1.43GHzfrequency band. The working requirements of the antenna implanted into a complex environment can be satisfied.

The invention discloses a double-frequency band-pass filter based on electromagnetic mixed coupling. The double-frequency band-pass filter is structurally characterized in that the lower surface of a medium substrate (7) is completely covered with a metal layer, the portion, on the upper surface, of the metal layer comprises a first input/output feeder line (1), a second input/output feeder line (2), a first double-frequency resonator (3), a second double-frequency resonator (4), an interdigital capacitor (5) and a short circuit branch knot (6), and metalized through holes (34) in the medium substrate (7) connect the portion, on the upper surface, of the metal layer with the portion, on the lower surface, of the metal layer. The first double-frequency resonator (3) and the second double-frequency resonator (4) generate electrical coupling through the interdigital capacitor (5) and generate magnetic coupling through the short circuit branch knot (6). The mixed coupling has the advantages that the electrical coupling can independently adjust first pass-band bandwidth, and the magnetic coupling can independently adjust second pass-band bandwidth. The filter is compact in structure, easy to integrate, short in process cycle, and capable of being used for a double-frequency transceiver for frequency selection.

The invention provides a manufacturing method for a humidity sensor and the humidity sensor manufactured by using the method. The manufacturing method comprises the following steps: forming a conductive zero layer on a silicon wafer substrate by using an ion implantation method and high-temperature annealing; growing a first silicon oxide dielectric layer on the conductive zero layer; forming first contact holes in the first silicon oxide dielectric layer; depositing a first metal film layer on the first silicon oxide dielectric layer by a physical vapor deposition method, and connecting the first metal film layer with the conductive zero layer through the first contact holes; forming a heating resistor, depositing a second silicon oxide dielectric layer, and forming second contact holes penetrating through the second silicon oxide dielectric layer; depositing a second metal film layer, and connecting the second metal film layer with the first metal film layer through the second contact holes; forming an interdigital capacitor; depositing a third silicon oxide dielectric layer; coating a humidity-sensitive polyimide film material. The manufacturing method provided by the invention has the beneficial effects that the heating resistor can be used for heating a humidity-sensitive capacitor and evaporating out excess water, so that the humidity sensor restores normal functions.

A compact multilayer band-pass filter using an interdigital capacitor which can be integrated into a compact form in a relatively low frequency band. The band-pass filter filters only a signal of a predetermined frequency band from a signal applied through an input terminal, and outputs a filtered signal to an output terminal. The band-pass filter includes at least one pair of transmission lines, respectively formed between the input terminal and the output terminal provided on an uppermost layer, for generating an inductor component, a capacitance compensation unit, with the interdigital capacitor having a plurality of layers, for loading a specified capacitance to one end of the transmission line, and a ground layer coupled to a specified layer of the capacitance compensation unit and the other end of the transmission line and formed on a lowermost layer.

The present invention relates to a wideband voltage-controlled oscillator circuit with low phase noise and low power consumption. A conventional wideband voltage-controlled oscillator has poor noiseproof performance and high power consumption and the application of the conventional wideband voltage-controlled oscillator in a radio-frequency communication system is limited. The wideband voltage-controlled oscillator circuit of the present invention comprises one negative-resistance oscillation structure and two buffer structures, wherein the negative-resistance oscillation structure comprises a negative-resistance structure and a resonant network; the negative-resistance structure comprises two PMOS (Positive Channel Metal Oxide Semiconductor) transistors and two NMOS (Negative Channel Metal Oxide Semiconductor) transistors; the resonant network comprises a resonant inductor, a switched capacitor array, two variable capacitors and two fixed capacitors; the switched capacitor array comprises fifteen switched capacitor units to form four controlled selection ends for realizing sixteen frequency band selections; each switched capacitor unit comprises two MOM (Metal-Oxide-Metal) capacitors, two inverters and one NMOS transistor; and three-dimensional interdigital capacitors are adopted as the MOM capacitors. The oscillator circuit of the present invention realizes a wide frequency regulating range and realizes the performance of low phase noise and low power consumption through corresponding phase noise optimization.

The invention relates to a miniaturized substrate integrated waveguide based on a metamaterial and aims at achieving integrated waveguide miniaturization under the condition that the working band width is ensured. The miniaturized substrate integrated waveguide comprises two 50omega microstrip lines and two microstrip line and substrate integrated waveguide conversion structures. each 50omega microstrip line is of a metal strip structure. Each microstrip line and substrate integrated waveguide conversion structure is a gradually wide metal strip. Wide-end mirror images of the microstrip line and substrate integrated waveguide conversion structures are fixed at the middle positions of the left and right sides of a dielectric slab. One end of each of two omega microstrip lines is respectively connected with the narrow ends of the microstrip line and substrate integrated waveguide conversion structures to form an integral structure. The upper portion and the lower portion of the dielectric slab are correspondingly provided with 2N metal through holes. Interdigital capacitor slots are etched between the through holes at the upper portion and the lower portion of the dielectric slab. The miniaturized substrate integrated waveguide serves as an integrated waveguide device.

There is herein disclosed an interdigital capacitor, an inductor, and an LH transmission line and a coupler using the interdigital capacitor and the inductor. The interdigital capacitor comprises two finger sets which are substantially disposed in parallel with each other. Fingers of each finger set are overlapped at outer edges thereof with each other to thereby generate capacitance. The inductor is formed substantially spirally inside the transmission line, so that it can have a large inductance in a compact shape and can be used in a broad frequency band. The LH transmission line has a broad frequency band in a compact shape, which includes interdigital capacitors connected in series with each other and inductors connected in parallel with each other. In addition, the coupler employing the LH transmission line has an excellent couplability.