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35 条记录 (耗时 0.033 秒)

    Method of and apparatus for performing antenna cosite analysis
    11.
    发明授权
    Method of and apparatus for performing antenna cosite analysis 失效

    公开(公告)号：US5875391A

    公开(公告)日：1999-02-23

    申请号：US686967

    申请日：1996-07-25

    申请人： Terence Michael Riley ,  James Higgins ,  Robert S. Mawrey

    发明人： Terence Michael Riley ,  James Higgins ,  Robert S. Mawrey

    IPC分类号： H04B17/00 ,  H04B1/10 ,  H04B1/38

    CPC分类号： H04B17/20 ,  H04B17/15

    摘要： An antenna cosite analysis system with: interactive displays for i) designing an antenna tower for placement of one or more antennas on the tower, ii) designing wireless communication circuits, and iii) relating the antennas on the tower to the wireless communication circuits; and an RF analysis system for analyzing interference between the wireless communication circuits. A process for determining intermodulation interference between transmitters and one or more receivers includes the steps of: determining a minimum susceptibility of the receivers; determining a highest order intermodulation product generated as a result of interference between the victim transmitter and each other transmitter with a power level sufficient to exceed the minimum susceptibility of the one or more receivers at the victim transmitter; and determining the intermodulation products generated as a result of interference between the victim transmitter and the other transmitters, the intermodulation products being determined up to the highest order intermodulation product of a minimum leakage transmitter-victim transmitter pair. Also disclosed is a process for determining intermodulation interference in a receiver, an apparatus for determining intermodulation interference in transmitter, and an apparatus for determining intermodulation interference in a receiver.

    Systems and methods for measuring an RMS voltage
    19.
    发明申请
    Systems and methods for measuring an RMS voltage 失效

    公开(公告)号：US20070024265A1

    公开(公告)日：2007-02-01

    申请号：US11189318

    申请日：2005-07-26

    申请人： James Higgins

    发明人： James Higgins

    IPC分类号： G01R19/00

    CPC分类号： G01R19/03

    摘要： An embodiment of a method for measuring an RMS voltage of an arbitrary time-varying waveform includes: a) coupling said arbitrary time-varying waveform to said thermally sensitive device; b) decoupling said arbitrary time-varying waveform from said thermally sensitive device; c) coupling said thermally sensitive device to said controlled DC voltage source; d) measuring a current through said thermally sensitive device at least two points in time; e) determining a change in said current over said at least two points in time; f) if said current is increasing between said at least two points in time, then decrease said controlled DC voltage source responsive to determining that said current is increasing; g) if said current is decreasing between said at least two points in time, then increase said controlled DC voltage source responsive to determining that said current is decreasing; and h) repeating steps a)-g).

    Axially-sealed NMR sample tube assemblies
    20.
    发明授权
    Axially-sealed NMR sample tube assemblies 失效
    轴向密封的NMR样品管组件

    公开(公告)号：US06812706B2

    公开(公告)日：2004-11-02

    申请号：US10387762

    申请日：2003-03-12

    申请人： Jimmy Leung ,  Layne Howard ,  James Higgins ,  Bao Nguyen

    发明人： Jimmy Leung ,  Layne Howard ,  James Higgins ,  Bao Nguyen

    IPC分类号： G01V300

    CPC分类号： G01R33/307

    摘要： An NMR sample tube assembly for holding a sample comprises a sample tube, a sealing plug for sealing the sample within the sample tube, and a rotor for spinning the assembly. The plug is clamped to the sample tube by an axial force. Preferably, the sample tube has a sealing flange protruding from the sample tube exterior along an inlet region of the sample tube. A filling part of the plug is sized to maintain an air escape clearance between the filling part and the sample tube for allowing air to escape out of the sample tube as the filling part is inserted therein. The rotor is secured to a protruding sealing part of the plug and clamps the sealing part to the sealing flange. The designs allow the use of wide sample tube mouths, and reduce the amount of air bubbles present in the samples during measurements.

    摘要翻译： 用于保持样品的NMR样品管组件包括样品管，用于密封样品管内的样品的密封塞和用于旋转组件的转子。 插头通过轴向力夹在样品管上。 优选地，样品管具有沿着样品管的入口区域从样品管外部突出的密封凸缘。 塞子的填充部分的尺寸设置成在填充部分和样品管之间保持空气逸出间隙，以便当填充部分插入其中时允许空气从样品管中逸出。 转子固定在插头的突出的密封部分上并将密封部分夹紧到密封凸缘上。 这些设计允许使用宽的样品管口，并且在测量期间减少样品中存在的气泡的量。