135 results about "Superconducting filter" patented technology

The present invention relates to superconductive filter technology. According to the arrangement of the superconductive filter (1), a columnar resonating member (23) having a superconductive material formed on the surface thereof is attached at one of its ends thereof to an inner wall (22) of a filter housing (21) so that a space is interposed between the columnar resonating member and each of connectors (27a, 27b) which are connectable to a signal input / output cables (5a, 5b), respectively. According to this arrangement, heat conduction from the outside can be suppressed as far as possible, and the superconductive condition can be created with stability, with the result that a stable filtering characteristic can be created. Further, the superconductive filter according to the present invention will become excellent in power withstand performance, and hence even if the number of stages of filters is increased for attaining a steep cutoff characteristic, the loss deriving from the increased number of stages can be suppressed to the minimum level.

A filter network designed for providing high frequency selectivity with a high degree of reliability and availability. The filter network comprises a superconducting filter and a non-superconducting filter, or a combination thereof to form multiplexers. A receive side of the non-superconducting filter pre-filters received RF signals before inputting them to the superconducting filter. The non-superconducting filter is constructed and arranged to pass RF signals having a frequency within a first pass band to the superconducting filter. The superconducting device is constructed and arranged to exhibit a high-degree of frequency selectivity in further narrowing the received RF signals. Other aspects are directed to the arrangement, construction, and uses of the same structures to accomplish different but similar goals. In a multiplexed configuration, various combinations of transmit filters are used to enable the use of a common antenna with the receive side electronics, which may be located at the top of the antenna tower or in the base station.

The present invention is one kind of symmetric double-spiral resonator and the band-pass filter therewith. The present invention features that the resonator consists of two linearly symmetric microstrip lines in spiral structure and connected into one integral, and the band-pass filter consists of input microstrip, output microstrip and resonator array comprising several double-spiral resonators. The filter of the present invention has the advantages of excellent frequency selectivity, high stop band suppression; and the resonator in symmetric double-spiral structure has reduced size, reduced coupling effect of non-adjacent resonators, and simplified circuit design and regulation. The present invention makes it possible to make traditional planar microstrip filter with common metal material and is suitable for making high temperature superconductive filter with high quality factor.

A four-model resonator-based compact dual-passband high-temperature superconductive filter is characterized by comprising an outer ring half wavelength hairclip resonator, an open circuit T type spiral branch, a first open circuit spiral branch, a second open circuit spiral branch, an input end and an output end; the open circuit T type spiral branch is arranged in the outer ring half wavelength hairclip resonator symmetrical about the open circuit T type spiral branch; the first and second open circuit spiral branches are arranged in the outer ring half wavelength hairclip resonator, and are symmetrical about the open circuit T type spiral branch; and the distance between the first open circuit spiral branch and the open circuit T type spiral branch is the same as that between the second open circuit spiral branch and the open circuit T type spiral branch; and the input end and the output end are in gap coupling with the outer ring half wavelength hairclip resonator. The four-model resonator-based compact dual-passband high-temperature superconductive filter can meet the communication system filtering demands on signals in non-adjacent wavebands, is small in size, simple and compact in structure, flexible in design and has an ultrahigh Q value.

This invention provides a thin superconducting oxide film, which can realize a high critical current, and a superconducting member having a high level of electric power resistance. The superconducting member comprises a sapphire R face substrate, a buffer layer formed of grain lumps of an oxide provided on the sapphire R face substrate, and a superconducting layer provided on the buffer layer. The nearest neighbor distance between oxygen atoms in the oxide and the grain diameter of grain lumps of the oxide have been specified. The superconducting member can be used as a member for superconducting filters.

The invention relates to a high temperature superconductive microstrip filter with a tap structure, which belongs to the field of microwave communication technology equipment. The microwave filter comprises an input feeder, an output feeder, and a plurality of sections of U type half wavelength resonators which are arranged in parallel, and is characterized in that: at least one section of half wavelength resonator is a resonator with the tap structure and is used for introducing a transmission zero into the passband edge of the filter. In the high temperature superconductive microstrip filter, the appropriate transmission zero is introduced by using the tap structure to make a transitional zone steep. The high temperature superconductive microstrip filter has the advantages of small overall size, low insertion loss, high out-of-band rejection and the like, is used for manufacturing a high temperature superconductive filter and is suitable for a plane type common metal microstrip filter.

This invention refers to analog signal process and communication technology, especially refers to the group delay equalization of high temperature superconductive filter used in high temperature superconductive film technology field, which contains high temperature superconductive microstrip filter, 3db mixing coupler and two single end reflection filter, is a plane microstrip structure and adapts for making phase equalization and reducing phase distortion to the high temperature superconductive filter of RF front end in satellite receiving system and receiving front end in base station of mobile communication system. Said invention is integrated in one medium substrate and has more stable performance.

Disclosed is a miniaturized superconducting filter with multiple transmission zero points, which is miniaturized while guaranteeing inner linearity phase characteristics of the pass band and outer high steepness of the pass band. The miniaturized superconducting filter consists of three groups of micro-strip resonators in cascade connection, each group includes four micro-strip resonators in cascade connection, and each resonator consists of an interdigital slow-wave structure and a clip resonance structure. A non-contact coupling micro-strip line is arranged between two resonators in each group, and the fourth resonator and the seventh resonator share the same node cross-coupling structure. The effective length of each resonator of the filter is one second of wavelength, and the substrate materials of the filter are MgO. The number of resonators for realizing six transmission zeros is reduced to 10 from 12 by the shared node cross-coupling structure, so that the filter is further miniaturized, and the problem of overlarge size of the existing filter with multiple transmission zeros is solved. Accordingly, the structure of the miniaturized superconducting filter is more applicable to manufacturing high-performance-index superconducting filters with multiple transmission zero points.

A superconducting filter device is disclosed that is able to prevent current concentration and improve electrical surface resistance. The superconducting filter device includes a first dielectric substrate, and a bulk superconducting resonator that is embedded in the first dielectric substrate and is formed from a bulk superconducting material.

A resonator of a planar circuit type is provided for receiving a signal from an input end and transmitting a signal to an output end. The resonator includes: (a) a dielectric substrate; (b) a ground plane including a layer of conductive material formed on the bottom surface of the substrate; (c) an inductor formed on the top surface of the substrate and connected to the input and output ends; and (d) a series capacitor connected in parallel to the inductor, wherein the series capacitor includes two patches of conductive material formed on the top surface of the substrate, each patch being connected to one respective end of the resonator. Each patch also forms a shunt capacitor with the ground plane, and the capacitance of the shunt capacitor constitutes the majority of capacitance between the ground plane and the end of the resonator that is connected to the patch. The conductive material may be a superconductor, including oxide superconductors. Filters utilizing multiple resonators of the invention are also described. The integration of the series and shunt capacitors results in a more compact resonator and filter layout, allows broader manufacturing tolerances, and allows for more layout flexibility than is attainable with the technology of the prior art.

The invention relates to a perovskite structure-based single-phase iron-based superconductive material and a preparation method thereof. The material has a two-dimensional laminar structure, and the composition is shown by the formula of Sr4V2O6Fe2As2. The preparation method of the material comprises the following steps of: preparing a SrAs precursor sample and an FeAs precursor sample; mixing the precursors, Sr0, V2O3, Fe and the like by using a solid-state chemical reaction method; and reacting at a high temperature to directly synthesize a perovskite layer-based iron-based superconductive material. Compared with other known iron-based superconductors, the material has higher bidimensionality. The material has electronic carrier characteristics, carrier concentration of 1,020 to 1,022 / cm<3> and superconductive transformation temperature of about 40K. An upper critical magnetic field of the material at a low temperature is estimated to be greater than 250 teslas, so that the material is probably applied to superconductive power transmission, strong magnetic field generation and the like. In addition, the material can also be used in a superconductive filter and the like. The preparation method is simple.

The invention relates to a tunable superconducting filter, and a manufacturing method and a metal shielding box of the tunable superconducting filter, wherein the tunable superconducting filter comprises a plurality of superconducting micro-strip resonators a superconducting micro-strip input connector and a superconducting micro-strip output connector; a semiconductor capacitance-variable diode for adjusting the frequency of the tunable superconducting filter and a fixed capacitor for isolating the direct current voltage of the semiconductor capacitance-variable diode are arranged on each superconducting micro-strip resonator; or two semiconductor capacitance-variable diodes which have opposite negative polarities and are used for adjusting the frequency of the tunable superconducting filter are arranged; and the superconducting micro-strip input connector and the superconducting micro-strip output connector are connected with external microwave circuits. In combination with the advantages of low microwave loss of a superconducting material, high tenability and quick response speed of the semiconductor capacitance-variable diodes and the like, the microwave tunable filter with high turning scope, wide narrow band, low loss and quick adjustable speed is manufactured.

The invention relates to a microwave subsystem of high heat resistance which is used in the fore end of the weather radar receiver, it includes: superconductive filter, low noise amplifier with table structure, tiny band transmission line, sealed shell, refrigeration machine and temperature control instrument; Said superconductive filter includes high temperature superconductive shield box and superconductive piece which is in the high temperature superconductive shield box; the output end of the superconductive filter is electric connected with the low noise amplifier via tiny band transmission line, both are installed on the heat transferring plate, the bottom of the heat transferring plate is fixed to the cool head of the refrigeration machine. The advantages of the invention are realizing the flat integrating technique and making the assembly of the subsystem more reasonable, so the noise of the subsystem is decreased further; the heat resistance of the invention is high, the cool quantity wastage of the subsystem cool head is small, so under the equal refrigeration power, flat integrating technique can load more components. For example, the same refrigeration machine can load several superconductive components or other device.

The invention provides a micro-strip resonator with a comb-shaped structure and a filter thereof. The invention is characterized in that the micro-strip resonator with the comb-shaped structure consists of a micro-strip line arrayed by folding, and the micro-strip line is folded and arrayed into an integral comb-shaped structural form; and the filter comprises an input micro-strip, an output micro strip and a plurality of micro-strip resonators with the comb-shaped structure. The invention has the advantages that the comb-shaped structure can reduce the size of the resonator, thus the structure is more compact; intercoupling between nonadjacent resonators is weakened so as to ensure that the design and the adjustment of circuits are simpler; and meanwhile, the formed filter has good frequency selectivity and stop band suppression characteristics. The micro-strip resonator not only can be used for manufacturing high-performance high temperature superconductivity filters, but also is suitable for manufacturing traditional plane type metal micro-strip filters.

This invention provides a laser trimming method for tuning the frequency of a spiral resonator, and for improving the characteristics of a high temperature superconductor filter comprised of high temperature superconductor spiral resonators, by tuning the individual high temperature superconductor spiral resonators. This invention also provides a method for tuning the resonance frequency of a high temperature superconductor planar coil. This invention also provides a laser ablation process for creating high temperature superconductor circuit elements.

A regulation-free coupling structure of a high-temperature super conduction filter used in satellite communication characterizes in inserting sections of L transmission lines in the same process technology with the resonator and tap and finished at one run in a suitable place between two resonators connected by wires at both sides of a bandpass filter and another resonator slantly opposite to them suitable for the design of frequency preselector of satellite receiving system RF front end or the base station front end in mobile communication system. Reflection loss in pass-band reduces to -20dB from original-15dB and transmission efficiency S21 is improved.

A superconducting filter apparatus having a refrigerator for cooling the superconducting filter to cryogenic temperatures, a pilot signal generator for generating a pilot signal that is outside the pass band and inputting the pilot signal to the superconducting filter together with an antenna receive signal, and a discriminating unit for discriminating abnormality in the refrigerator. If the refrigerator malfunctions and temperature of the superconducting filter rises, the pass band of the superconducting filter shifts to the low-frequency side and crosses the frequency of the pilot signal. The pilot signal passes through the superconducting filter at this time. The discriminating unit discriminates abnormality in the refrigerator based upon the pilot signal contained in the output of the superconducting filter.

This invention relates to a plane high temperature superconducting filter composed of different kinds of resonators or a same kind in different sizes, when designing a filter, one can select resonators in different resonance modes, geometric sizes and power loading capacities to make up its inferior position so as to design higher stages under the situation of guaranteeing that the power loading ability is not changed.

The invention discloses a structure of a coaxial pulse tube refrigerator for cooling a high-temperature superconductivity filter and the manufacturing method thereof. The structure is composed of a hot end heat exchanger, a cold head, a heat conducting belt, a cold plate, a high-reflection cold shield, an anti-radiation screen, an H-shaped Dewar flask, a Dewar cover, a thin framework structure and an equipment box. The pulse tube refrigerator is high in reliability and long in service life, the cold end is free of moving parts, and the influence of moving vibration of the cold end on signal transmission of the high-temperature superconductivity filter is eliminated. According to the structure of the coaxial pulse tube refrigerator for cooling the high-temperature superconductivity filter and the manufacturing method thereof, the advantages of the coaxial pulse tube refrigerator of being easy to couple and compact in overall structure are fully utilized, and a stable, reliable, low-noise and low-vibration low-temperature cold source can be provided for the high-temperature superconductivity filter. The structure of the coaxial pulse tube refrigerator for cooling the high-temperature superconductivity filter and the manufacturing method thereof have positive significance for further application and promotion of the high-temperature superconductivity filter and practicability of the coaxial pulse tube refrigerator in fields such as mobile communication.

The present invention relates to superconductive filter technology. According to the arrangement of the superconductive filter (1), a columnar resonating member (23) having a superconductive material formed on the surface thereof is attached at one of its ends thereof to an inner wall (22) of a filter housing (21) so that a space is interposed between the columnar resonating member and each of connectors (27a, 27b) which are connectable to a signal input / output cables (5a, 5b), respectively. According to this arrangement, heat conduction from the outside can be suppressed as far as possible, and the superconductive condition can be created with stability, with the result that a stable filtering characteristic can be created. Further, the superconductive filter according to the present invention will become excellent in power withstand performance, and hence even if the number of stages of filters is increased for attaining a steep cutoff characteristic, the loss deriving from the increased number of stages can be suppressed to the minimum level.

The invention discloses a superconducting link system, comprising a network adapter device, a network protector, an ultralow temperature vacuum multi-channel combined type Dewar, a high temperature superconduction wave filter, an ultralow temperature low-noise amplifier (LNA), a refrigerating system, a high-stability power supply system and an superconducting link intelligent monitoring system, wherein the high temperature superconduction wave filter and the ultralow temperature LNA are arranged in the ultralow temperature vacuum multi-channel combined type Dewar and operate in high vacuum environment with ultralow temperature and long-term holding pressure. In the superconducting link system, a brand new scientific overall structure design and a special manufacturing technology are adopted, thus the superconducting link system has extremely high out-band interference resisting capability and intermodulation interference reducing capacity, and can effectively reduce background noise of the system and improve gains for useful signals, thereby greatly enhancing the performance of a receiving link from an antenna to the output end of a receiver of a master station, greatly improving communication coverage, quality, capacity, user satisfaction, low-carbon and environmental-friendly network environment, and greatly increasing resource utilization rate of frequency spectrum and system equipment, return on investment, construction speed and the like.

There is provided a signal processing method comprising: inputting an input signal having a certain band; dividing said input signal into a signal in a stop band and a signal in a pass band outside said stop band with a use of a band stop filter which has a center frequency of said input signal inside said stop band and includes a first resonator having said center frequency as a resonance frequency; extracting a signal in a desired band from the signal in said pass band with a use of a plurality of second resonators; decomposing the signal in said stop band into signals whose degeneracy of said resonance frequency are released; combining a degeneracy-released signals and the signal in said desired band to obtain a combined signal; and outputting the combined signal.

The invention discloses a high-temperature superconducting filter device with a controllable transmission zero, which is characterized by comprising a high-temperature superconducting substrate and resonators arranged on the substrate. The resonators are arranged in a CQ (Cascade Quadraplets) structure circuit form. The high-temperature superconducting filter device also comprises a cross-coupled line and a variable capacitor, wherein the cross-coupled line introduces cross coupling between any two resonators; and the variable capacitor is connected onto the middle position of the cross-coupled line. According to the high-temperature superconducting filter device with a controllable transmission zero, the capacitance value of the variable capacitor is changed through program control, the CQ structure is realized, performance of a high out-of-band rejection bandpass filter is realized, and electric tuning of the out-of-band transmission zero is controllable.

The invention discloses a continuously adjustable superconductive filter system using an upper computer to control multiple working modes and belongs to the field of microwave communication technical equipment. The continuously adjustable superconductive filter system comprises an adjustable superconductive filter, a frequency control circuit, a low-temperature vacuum dewar flask, a refrigerating machine, a temperature control circuit of the refrigerating machine, and the upper computer. The frequency control circuit is formed by a programmable single chip microcomputer and a DA module. The adjustable superconductive filter is arranged in the low-temperature vacuum dewar flask. The refrigerating machine is connected with the low-temperature vacuum dewar flask. The adjustable superconductive filter is connected with the frequency control circuit. The upper computer is communicated with the frequency control circuit through a serial port. The adjustable superconductive filter is a continuously adjustable high-temperature superconductive filter. The continuously adjustable superconductive filter system has the advantages of being modularized, capable of being easily in cascade connection with other devices, stable in working state and the like, continuous and real-time adjustability of center frequency is achieved, the working modes can be expanded and changed according to user demands, and the diversity and flexibility of the working modes of the system are enhanced.

The microstrip filter is composed of input and output microstrips, first and last resonators of receiving direct excitation as well as multiple groups of hair clip type resonators with effective length in half wave length. In each group, number and direction of resonator are same, and directions are different between groups. Input and output microstrips in filter are connected to first and last resonators in filter directly. Couple between resonators is weak in same group since their directions are identical, and Couple between resonators in different groups is stronger. Thus, number of resonators is same group can be adjusted smartly in order to suite filter in different filters designed I different bandwidths. The invention is applicable to traditional plane type metal microstrip filer, also filter in high-temperature superconductor having high quality.

A compact superconducting filter device can easily change a bandwidth and a center frequency without changing a pattern or shape of the filter. A filter pattern is formed on a substrate made of a dielectric material. The filter pattern is made of a superconductor material. A signal input line and a signal output line are formed on the substrate so as to extend from a periphery of the filter pattern. An adjust plate is located above the filter pattern with a predetermined distance therebetween. The adjust plate is formed of one of an electrically conductive material, a superconductive material and a dielectric material.