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公开(公告)号：US5694140A
公开(公告)日：1997-12-02
申请号：US565566
申请日：1995-11-30
申请人： Timothy G. Waterman , Gary E. Evans
发明人： Timothy G. Waterman , Gary E. Evans
摘要： A non-squinting helical antenna is divided into segments separated by a coupler. This coupler is preferably a four port coupler which serves as a summation and difference power divider. Such a four port coupler allows the formation of a closed loop for controlling the steering angle of the antenna. The summation and difference signals between segments are monitored, and the ratio of these signals is used to determine and correct error in steering. The steering angle of the antenna can thus be maintained over a range of frequencies within a decibel of error.
摘要翻译： 非倾斜螺旋天线被分成由耦合器分开的段。 该耦合器优选地是用作求和和差分功率分配器的四端口耦合器。 这种四端口耦合器允许形成用于控制天线的转向角的闭环。 监测各段之间的求和和差分信号，并使用这些信号的比例来确定和纠正转向误差。 因此，可以在误差范围内的频率范围内维持天线的转向角。
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公开(公告)号：US4743911A
公开(公告)日：1988-05-10
申请号：US835675
申请日：1986-03-03
申请人： Gary E. Evans
发明人： Gary E. Evans
摘要： An array antenna feed system which provides a constant beamwidth over a large bandwidth of operating frequencies. In transmitter applications, the applied signal is divided into correction and basic signals by a frequency sensitive splitter. The magnitudes of the basic and correction signals provided by the splitter vary sinusoidally with frequency and are displaced a quarter cycle from each other on the frequency scale. The correction and basic signals are combined in series or corporate coupler arrays to drive the individual antenna elements. Coupler coefficients are predetermined to make the complex addition of the correction and basic signals provide a resulting synthesized signal which gives the desired voltage distribution for the same beamwidth at the operating frequency limits. In receiving applications, the splitter functions to combine the correction and basic signals from the coupler array and transfer a combined signal to the receiver circuitry.
摘要翻译： 阵列天线馈电系统，其在大的工作频带宽度上提供恒定的波束宽度。 在发射机应用中，应用信号由频率敏感分路器分为校正和基本信号。 分离器提供的基本和校正信号的幅度随着频率正弦波变化，并在频率刻度上相互偏移四分之一周期。 校正和基本信号被串联或公司耦合器阵列组合以驱动各个天线元件。 耦合器系数是预先确定的，以使得校正和基本信号的复杂相加提供了一个所得到的合成信号，该信号为在工作频率极限处的相同波束宽度给出了期望的电压分布。 在接收应用中，分离器用于组合来自耦合器阵列的校正和基本信号并将组合信号传送到接收器电路。
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3.发明授权
公开(公告)号：US4577167A
公开(公告)日：1986-03-18
申请号：US447824
申请日：1982-12-03
申请人： Gary E. Evans
发明人： Gary E. Evans
CPC分类号： H01P5/20
摘要： A strip transmission line power divider having an isolated port remote from the output ports is disclosed. Power division is provided by a two branch strip transmission line. A coaxial transmission line coupled between the output ports of the divider is coupled to an isolated port where terminating resistors of any convenient power rating may be used.
摘要翻译： 公开了一种具有远离输出端口的隔离端口的带状传输线功率分配器。 功率分配由两条分支传输线提供。 耦合在分压器的输出端口之间的同轴传输线耦合到隔离端口，其中可以使用任何方便的额定功率的终端电阻器。
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公开(公告)号：US4553145A
公开(公告)日：1985-11-12
申请号：US575643
申请日：1984-01-31
申请人： Gary E. Evans
发明人： Gary E. Evans
CPC分类号： G01R29/10
摘要： A method of forming the far-field beam pattern of an antenna at short ranges is disclosed. More specifically, the antenna beam pattern is rotated through a rotational angle about the line-of-sight of a source of radar signalling located at a near-field range away from the antenna. Measurements of the field of the antenna are taken at predetermined angular increments during the rotation thereof. The far-field beam pattern of the antenna is formed by deriving discrete values thereof for corresponding angle increments along the angular rotation. Preferably, a multiplicity of antenna field measurements are selected about each selected angular increment based on a predetermined angular spacing. The discrete beam pattern value corresponding to each selected angular increment is derived as the weighted summation of the multiplicity of antenna field measurements associated therewith. The derivation of each discrete beam pattern value may be performed substantially as the antenna field measurements are taken during the rotation of the antenna.
摘要翻译： 公开了一种在短距离范围内形成天线的远场光束图案的方法。 更具体地，天线波束图案围绕位于远离天线的近场范围的雷达信号源的视线旋转旋转角度。 天线的场的测量在其旋转期间以预定的角度增量进行。 天线的远场光束图案是通过对角度旋转相应的角度增量导出其离散值而形成的。 优选地，基于预定的角度间隔选择关于每个所选角度增量的多个天线场测量。 对应于每个所选角度增量的离散波束图案值被导出为与其相关联的多个天线场测量的加权求和。 每个离散波束图案值的推导可以基本上在天线旋转期间进行天线场测量时执行。
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公开(公告)号：US5503150A
公开(公告)日：1996-04-02
申请号：US208553
申请日：1994-03-10
申请人： Gary E. Evans
发明人： Gary E. Evans
CPC分类号： A61N5/02
摘要： A method and apparatus for noninvasively locating and heating a volume of tissue, specifically a cancerous tumor, including placing a bolus in contact with the patient and substantially around an area of interest including the volume of tissue, placing an array of antennas on the bolus and substantially around the area of interest, imaging the area of interest, selecting an approximate center of the volume of tissue on said initial image, determining appropriate amplitudes and phases for the antennas, energizing each element at respective appropriate amplitudes and phases to heat the volume of tissue, repetitively imaging the area of interest to create subsequent images, and subtracting said initial image from the subsequent images to determine temperature changes in the area of interest.
摘要翻译： 一种用于非侵入性地定位和加热一定体积的组织，特别是癌性肿瘤的方法和装置，包括将大剂量与患者接触并且基本上围绕感兴趣的区域包括组织体积，将天线阵列放置在推注上，以及 基本上围绕感兴趣区域成像感兴趣的区域，选择所述初始图像上的组织体积的大致中心，确定天线的适当幅度和相位，以各自适当的幅度和相位激励每个元件，以加热 组织，重复地成像感兴趣的区域以产生后续图像，以及从后续图像中减去所述初始图像以确定感兴趣区域中的温度变化。
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公开(公告)号：US5028930A
公开(公告)日：1991-07-02
申请号：US504706
申请日：1990-04-04
申请人： Gary E. Evans
发明人： Gary E. Evans
摘要： A coupling matrix for a circular array microwave antenna is described which permits the formation and phasing of multiple beams from a circular array. The present invention provides a beam forming and steering means for a circular array which utilizes at least one radio frequency signal as an input to a matrix of passive proximity couplers. These passive proximity couplers are configured in rows and are operable to form the radio frequency signal. These couplers are interconnected into distinguishable groups.
摘要翻译： 描述了用于圆形阵列微波天线的耦合矩阵，其允许从圆形阵列形成和定相多个波束。 本发明提供一种用于圆形阵列的波束形成和转向装置，其利用至少一个射频信号作为被动接近耦合器的矩阵的输入。 这些无源接近耦合器被配置成行并且可操作以形成射频信号。 这些耦合器被连接成可区分的组。
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公开(公告)号：US4638317A
公开(公告)日：1987-01-20
申请号：US622300
申请日：1984-06-19
申请人： Gary E. Evans
发明人： Gary E. Evans
IPC分类号： H01Q3/40
CPC分类号： H01Q3/40
摘要： A binary Butler matrix is expanded into a non-binary matrix coupled to a like number of non-binary antenna elements for forming multiple beams from a phased array and wherein an n.times.n Butler matrix drives n+l elements, and where the l elements are coupled to predetermined ports of the Butler matrix normally coupled to the n elements but coupled thereto through respective 180.degree. phase shifters such that, for example, the first or (n+1).sub.th element to the right of the n.sub.th element is coupled to the same port of the Butler matrix coupled to the 1st element but additionally through a fixed 180.degree. phase shifter while the first or 0.sub.th element to the left of the 1st element is coupled to the n.sub.th same port coupled to the n.sub.th element but including a respective 180.degree. phase shifter. Progressively increasing numbers of elements on either side of the n elements are respectively coupled to ascending and descending numbered ports of the binary matrix through respective 180.degree. phase shifters, the result being an amplitude taper of the composite beams formed thereby.
摘要翻译： 二进制Butler矩阵扩展成耦合到相似数量的非二进制天线元件的非二进制矩阵，用于从相控阵列形成多个波束，并且其中n×n Butler矩阵驱动n + 1个元件，并且其中l个元件耦合 通常耦合到n个元件的Butler矩阵的预定端口，但通过相应的180°移相器与其耦合，使得例如第n个元件右侧的第一或第（n + 1）个元件耦合到相同的 Butler矩阵的端口耦合到第一元件，但另外通过固定的180°移相器，而第一元件的左侧的第一或第零元件耦合到耦合到第n个元件的第n个相同端口，但包括相应的180度 移相器 在n个元件的任一侧逐渐增加的元件数量分别通过相应的180°移相器耦合到二进制矩阵的上升和下降编号的端口，结果是由其形成的复合波束的振幅锥度。
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公开(公告)号：US4187508A
公开(公告)日：1980-02-05
申请号：US956779
申请日：1978-11-01
申请人： Gary E. Evans
发明人： Gary E. Evans
CPC分类号： H01Q19/17
摘要： An antenna assembly with a curved reflector and feed means at one side of the focal axis of such reflector. The feed means includes a number of relatively-fixed-position feed elements spaced apart unequally to obtain signals of different phase at the reflector for forming a composite reflected beam with minimized sidelobe content.
摘要翻译： 具有弯曲反射器的天线组件和在该反射器的焦点轴线的一侧的馈送装置。 进给装置包括多个相对固定位置的馈送元件，其不均匀地间隔开以在反射器处获得不同相位的信号，以形成具有最小旁瓣含量的复合反射光束。
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公开(公告)号：US5264863A
公开(公告)日：1993-11-23
申请号：US10961
申请日：1993-01-29
CPC分类号： H01Q1/08 , H01Q1/3216
摘要： The mobile cylindrical microwave antenna array of the present invention comprises a plurality of rectangular panels when deployed forming a cylindrical array. The total number of panels forms an even number with each pair of panels, a left panel and a right panel, forming a subarray unit of the cylindrical array. These panels are hinged on the vertical outer edges to each other. The mobile cylindrical array has a center support structure which has a plurality of folding radial supports at the bottom and top of the center support structure. Each subarray unit is attached to the radial supports at the top and bottom. A motorized driver for translating is attached to each subarray unit and one radial support. When operated to collapse the deployed array, the motorized driver causes the left and right panel of the subarray unit to fold outwardly wherein the apex points to the center support. When the panels are fully collapsed against the center support, the radial supports are folded into the collapsed panels thus forming a compact cylindrical package.
摘要翻译： 本发明的移动式圆柱形微波天线阵列在展开形成圆柱形阵列时包括多个矩形面板。 面板的总数与每对面板，左面板和右面板形成偶数，形成圆柱形阵列的子阵列单元。 这些面板彼此垂直的外边缘铰接。 可移动圆柱形阵列具有中心支撑结构，其在中心支撑结构的底部和顶部具有多个折叠的径向支撑。 每个子阵列单元在顶部和底部附接到径向支撑件。 用于平移的电动驱动器连接到每个子阵列单元和一个径向支撑件。 当操作以折叠部署的阵列时，电动驾驶员使得子阵列单元的左侧面板和右侧面板向外折叠，其中顶点指向中心支撑件。 当面板相对于中心支撑件完全折叠时，径向支撑件被折叠成折叠的面板，从而形成紧凑的圆柱形包装。
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公开(公告)号：USH1244H
公开(公告)日：1993-10-05
申请号：US968921
申请日：1992-10-30
申请人： Gary E. Evans
发明人： Gary E. Evans
摘要： A device for absorbing resonances in a large circular cavity such as a microwave rotary joint that utilizes a horizontally positioned resonance absorber positioned in the balun cavity to absorb the resonances or undesired modes. The resonance absorber forms a folded slot with a resistor across its arms to interrupt the circumferential flow of current in the rim of the cavity without affecting the normal desired mode.
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