会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 4. 发明授权
    • Method and system for signal distortion characterization and predistortion compensation using mutual coupling in a radio frequency transmit/receive system
    • 用于在射频发射/接收系统中使用相互耦合的信号失真特征和预失真补偿的方法和系统
    • US08280312B2
    • 2012-10-02
    • US12841383
    • 2010-07-22
    • Eric N. BoeWilliam L. LewisJohn Fraschilla
    • Eric N. BoeWilliam L. LewisJohn Fraschilla
    • H04B17/00
    • H03F1/3247H04B1/0475H04B1/525
    • A method and system use the mutual coupling property of multiple antenna elements for characterizing signal waveform distortion introduced by items in the signal path, including the antenna elements, of a radio frequency transmit/receive system. The method and system alleviate the need for external test equipment by using the same hardware used in standard operation of the transmit/receive system for performing waveform distortion characterization through the generation, mutual coupling, and acquisition of a reference signal. In an embodiment involving application of complementary inverse predistortion to generation of an operational signal and/or to processing of a received operational signal, the signal as received and processed during standard system operation is compensated for distortion contributed by system hardware, improving impulse response and system performance.
    • 一种方法和系统使用多个天线元件的互耦合特性来表征由射频发射/接收系统的信号路径(包括天线元件)中的项目引入的信号波形失真。 该方法和系统通过使用发射/接收系统的标准操作中使用的相同的硬件,通过生成,相互耦合和获取参考信号来执行波形失真特性来减轻对外部测试设备的需求。 在涉及应用互补反向预失真来产生操作信号和/或处理接收到的操作信号的实施例中,在标准系统操作期间接收和处理的信号被补偿由系统硬件贡献的失真,改善脉冲响应和系统 性能。
    • 6. 发明授权
    • Honeycomb cross-polarized load
    • 蜂窝交叉极化负载
    • US5311199A
    • 1994-05-10
    • US783290
    • 1991-10-28
    • John FraschillaDavid A. Whelan
    • John FraschillaDavid A. Whelan
    • H01Q13/08H01Q17/00H01Q13/10
    • H01Q17/001H01Q13/085
    • An impregnated carbon film expanded into a honeycomb structure is employed in a tapered notch phased array antenna and is used to absorb cross-polarized incident fields to reduce the reflections from shorted TEM parallel plate modes existing between radiator elements of the antenna. The carbon loading used to achieve this absorption may comprise a resistive taper, or analog circuit or anisotropic elements having a predetermined tapering resistive profile. The honeycomb cross-polarized load of the present invention provides the electrical performance necessary to meet tapered notch phased array antenna electrical requirements while reducing the weight and cost of antennas in which it is employed.
    • 在锥形切口相控阵天线中采用膨胀成蜂窝结构的浸渍碳膜,用于吸收交叉偏振的入射场,以减少天线辐射体之间存在的短路TEM平行板模式的反射。 用于实现这种吸收的碳负载可以包括电阻锥度,或具有预定的锥形电阻分布的模拟电路或各向异性元件。 本发明的蜂窝交叉极化载荷提供了满足锥形陷波相控阵天线电气要求所需的电气性能,同时降低了使用天线的天线的重量和成本。
    • 7. 发明授权
    • Asymmetrically flared notch radiator
    • 不对称的装饰式散热器
    • US5187489A
    • 1993-02-16
    • US751241
    • 1991-08-26
    • David A. WhelanJohn Fraschilla
    • David A. WhelanJohn Fraschilla
    • G01S7/02H01Q13/00H01Q13/08H01Q13/10H01Q21/06
    • H01Q13/085
    • An asymmetrical notch radiating element comprising a metal or metal-clad dielectric substrate into which a tapered slot or notch is disposed. The direction of the axis of the tapered slot lies along any preselected axis and is not constrained to be collinear with the normal to the aperture of the element. An asymmetrical antenna array comprises a plurality of asymmetrical notch radiating elements as described above. Each of the plurality of radiating elements is disposed such that the apertures of each of the elements are substantially coplanar and are at an angle relative to the notch axis. The present antenna uses asymmetric slot lines to control the antenna's electrical performance. The precise slot dimensions are chosen to optimize radiation and reduce scattering. The asymmetric flared notch allows optimization of the transmit gain in a direction that is not necessarily normal to the array surface. The asymmetrical notch radiator is designed for use in phased array antennas where reduced radar cross section and wide bandwidth are essential, or in conformal arrays, where the surface normal and array axis are not collinear. The normally high specular radar reflection from the antenna radiators, that lies along the array normal, no longer points in the same direction as the peak antenna gain. This allows the design of a low radar cross section array antenna that does not suffer poor gain due to its reduced cross section.
    • 10. 发明授权
    • Ferro-electric frequency selective surface radome
    • 铁电频率选择性表面天线罩
    • US5600325A
    • 1997-02-04
    • US473821
    • 1995-06-07
    • David A. WhelanJohn FraschillaBrian M. Pierce
    • David A. WhelanJohn FraschillaBrian M. Pierce
    • G01S7/36G01S7/41G01S13/02H01Q1/42H01Q15/00G01S7/28
    • H01Q1/425H01Q15/0013G01S2013/0281G01S7/36G01S7/411
    • Ferro-electric frequency selective surface radomes that have dielectric layers that comprise voltage controlled material, and the electrical properties of the dielectric layers are voltage controlled. By varying the dielectric properties, the passband frequency of the radomes can be shifted to optimize frequency and angular response of the frequency selective surface. The radomes comprise grating screens having a plurality of printed radiating elements. Inner and outer voltage controlled dielectric layers are disposed on the grating screens. Relatively high ohms per square resistive films are disposed on exposed surfaces of the voltage controlled dielectric layers. In one embodiment, voltage control circuitry is coupled to the respective resistive films for controlling the voltages applied to the respective voltage controlled dielectric layers by actively varying the dielectric permittivity of the resistive films around a small percentage of its nominal value to provide a ground on outer surfaces of the dielectric layers. In another embodiment, the ferro-electric frequency selective surface radome may comprise voltage controlled dielectric layers disposed on one surface of the grating screens. Voltage control circuitry is coupled to the first and second grating screens for controlling the voltages applied thereto and thus the performance of the radome.
    • 具有包含电压控制材料的电介质层的铁电频率选择性表面天线罩,并且电介质层的电性能被电压控制。 通过改变介电特性,可以移动天线罩的通带频率以优化频率选择表面的频率和角度响应。 天线罩包括具有多个印刷辐射元件的光栅屏幕。 内部和外部电压控制介电层设置在光栅上。 每个方形电阻膜的相对高的欧姆设置在受压电介质层的暴露表面上。 在一个实施例中,电压控制电路被耦合到相应的电阻膜,用于通过主动地改变电阻膜的介电常数来围绕其标称值的小百分比来控制施加到相应的受控电介质层的电压,从而在外部 电介质层的表面。 在另一个实施例中,铁电频率选择性表面天线罩可以包括设置在光栅屏幕的一个表面上的压控电介质层。 电压控制电路耦合到第一和第二光栅屏幕,用于控制施加到其上的电压,从而控制天线罩的性能。