Abstract:
A narrowband filter comprises an input terminal, an output terminal, and an array of basic resonator structures coupled between the terminals to form a single resonator having a resonant frequency. The resonator array may be arranged in a plurality of columns of basic resonator structures, with each column of basic resonator structures having at least two basic resonator structures. The basic resonator structures in each column may be coupled between the terminals in parallel or in cascade. Two or more resonator arrays may be coupled to generate multi-resonator filter functions.
Abstract:
A heat exchanger assembly for transferring heat across a wall of a housing is disclosed. The assembly comprises an outer heat exchanger having an outer ring disposed outside the housing and having an interior surface in contact with an exterior surface of the wall; an inner support disposed inside the housing and having an exterior surface; and a plurality of inner heat fins connecting the exterior surface of the inner support to an interior surface of the wall of the housing.
Abstract:
A new class of novel super high temperature superconductive compositions and structures (SHTC), named Schrieffer Superconductors are disclosed. These superconductive compositions and structures preferably include a combination of (1) a metal, the metal characterized in having (i) a broad conduction electron band (or bands) and (ii) a low effective mass, and (2) magnetic species, wherein the spins of the magnetic species are correlated at relatively long distances. Preferably, the spins of the magnetic species are magnetically ordered ferromagnetically over relatively long range. One preferred composition is Au?2#191Mn?2-z#191Al?z#191 where 0.1
Abstract translation:公开了一类新的超高温超导组合物和结构(SHTC),称为Schrieffer超导体。 这些超导组合物和结构优选包括(1)金属,其特征在于具有(i)宽传导电子带(或多个谱带)和(ii)低有效质量的金属和(2)磁性物质的组合,其中 磁性物质的自旋在相对较长的距离处相关。 优选地,磁性物质的自旋在相对较长的范围内以磁性方式进行磁性排序。 一种优选的组成是Au 2 2 191 M n 2 z -1 191 Al z z 191其中0.1 < z&lt; 0.5,优选0.3。 p>
Abstract:
An electrical interconnect provides a path between cryogenic or cryocooled circuitry and ambient temperatures. As a system, a cryocable (10) is combined with a trough-line contact or transition (20). In the preferred embodiment, the cryocable (10) comprises a conductor (11) disposed adjacent an insulator (12) which is in turn disposed adjacent another conductor (13). The components are sized so as to balance heat load through the cryocable (10) with the insertion loss. In the most preferred embodiment, a coaxial cryocable (10) has a center conductor (11) surrounded by a dielectric (12) (e.g. Teflon ) surrounded by an outer conductor (13) which has a thickness between about 6 and 20 microns. The heat load is preferably less than one Watt, and most preferably less than one tenth of a Watt, with an insertion loss less than one decibel. In another aspect of the invention, a trough-line contact or transition (20) is provided in which the center conductor (11) is partially enveloped by dielectric (12) to form a relatively flat portion (28). The preferred overall geometry of the preferred embodiment of the cable is generally cylindrical, although other geometries are possible (e.g. stripline, microstrip, coplanar or slotline geometries).
Abstract:
Methods and reactors are described for the production of high temperature superconductor films on a variety of substrates, particularly those films which include volatile components during their manufacture. The reactors are particularly useful for producing films containing thallium. The reactors parts (10, 12, 14, 16) provide for relatively low volume cavities in which the substrate (22) is disposed, and control of the thallium oxide overpressure during the processing. In a preferred embodiment, one or more holes or apertures are made in the reactor to permit thallium and thallium oxide to controllably leak from the reactor. For manufacture of double sided superconducting films, a reactor is used having top (14) and bottom (10) plates each with one or more holes in them (18, 20). Uniform high temperature superconducting films are obtained while inhibiting reaction between the substrate and superconducting film during the processing.
Abstract:
A coating for high temperature superconducting devices consists of polyimide. In the preferred embodiment, the polyimide Probamide 412 is utilized to provide a passivation coating for thallium containing or YBCO superconductors. A substantially planar local structure is formed which may be utilized as the base for further structures, such as metallizations. A method for providing polyimide passivation coating on superconductors comprises generally the steps of coating the superconductor with the polyimide, optionally patterning the polyimide with photolithographic techniques, and curing the polyimide by a baking step.
Abstract:
A coated conductor comprises a substrate supporting a ReBCO superconductor adapted to carry current in a superconducting state. The superconductor is characterized in having peaks in critical current (J c ) of at least 0.2 MA/cm 2 in a magnetic field of about 1 Tesla when the field is applied normal to the surface of the superconductor and when the field is applied parallel to the surface of the superconductor, and further characterized in that the superconductor includes horizontal defects and columnar defects in a size and an amount sufficient to result in the said critical current response. The conductor is characterized in that the ratio of the height of the peaks in the J c is in the range from 3:1 with the ratio of the field perpendicular (0 degrees) to the field parallel (+/- 90 degrees) to the range from 3:1 with the ratio of the field parallel to the field perpendicular.
Abstract translation:涂覆导体包括支撑适于承载超导状态的电流的ReBCO超导体的衬底。 超导体的特征在于当场施加到超导体的表面时以及平行于表面施加场时,在约1特斯拉的磁场中,临界电流(Jc)的峰值为至少0.2MA / cm 2 的超导体,其特征还在于,超导体包括足以导致所述临界电流响应的尺寸和量的水平缺陷和柱状缺陷。 导体的特征在于,Jc中的峰的高度的比例在3:1的范围内,场的垂直(0度)与场平行(+/- 90度)的比率与范围 从3:1,场平均与场垂直的比率。
Abstract:
A method of constructing a band-stop filter comprises designing a band-stop filter including a signal transmission path, resonant elements disposed along the signal transmission path, and non-resonant elements coupling the resonant elements together to form a stopband having transmission zeroes corresponding to respective frequencies of the resonant elements. The method further comprises changing the order in which the resonant elements are disposed along the signal transmission path to create different filter solutions, computing a performance parameter for each filter solution, comparing the performance parameters to each other, selecting one of the filter solutions based on this comparison, and constructing the band-stop filter using the selected filter solution. Another RF band-stop filter comprises resonant elements coupled together to form a stopband, wherein at least two of the resonant elements have third order IMD components different from each other, such that the IMD components are asymmetrical about the stopband
Abstract:
Methods, systems and apparatus for filter design, analysis and adjustment are provided. Various embodiments may include, for example, methods, systems and apparatus for electric signal filter tuning. Embodiments may also include design techniques for planar electric signal (e.g., RF signals) filter tuning. In at least an embodiment of the present invention a technique for filter tuning is provided which may include parameter extraction, optimization and tuning recipes techniques that may require only a single permanent filter tuning. In at least another embodiment a system and method of filter design, analysis and adjustment according to the present invention includes use of tuning that may be set using a mechanical scribing tool or a laser trimming device. In at least one other embodiment, a filter tuning technique may be provided and include providing trimming tabs on a resonator edge that may be disconnected or trimmed for filter tuning.
Abstract:
A cryocooler cold end assembly is disclosed. The assembly includes a unitary external, outer housing (201). By constructing the housing (201) from a single unitary metal shell, part count is reduced from prior art assemblies. Additionally, all brazing requirements previously necessary to secure and seal the components are eliminated. Further, due to one or more machining steps subsequent to manufacturing/forming the external sealed housing, the tolerances are improved. This allows for shrink to fit assembly of several components and also results in improved straight-line accuracy between the piston bore (152) and the displacer cylinder (120). Due to this latter improvement, the need for a displacer liner is eliminated.