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    • 1. 发明申请
    • Beam forming matrix-fed circular array system
    • 梁形成矩阵馈送圆阵列系统
    • US20050259005A1
    • 2005-11-24
    • US10878723
    • 2004-06-28
    • Bing ChiangMichael LynchDouglas WoodSteven Goldberg
    • Bing ChiangMichael LynchDouglas WoodSteven Goldberg
    • H01Q3/22H01Q3/24H01Q3/26H01Q21/20H01Q25/00
    • H01Q21/205H01Q3/24H01Q3/2682H01Q25/00
    • A matrix-fed circular array system includes a plurality of antennas, a plurality of azimuth matrices in communication with the antennas, and a plurality of elevation matrices in communication with the azimuth matrices. The array system forms M×N beams, where M is the number of azimuth beams, and N is the number of elevation beams. In another embodiment, through the use of a Shelton-Butler or Butler matrix which includes a plurality of hybrids, the system outputs omni-directional pancake-shaped radiation patterns that are isolated from each other when a communication signal is input into the system. In yet another embodiment, the system uses a beam forming network including two Shelton-Butler matrices. A first one of the Shelton-Butler matrices creates omni-directional pancake beams that are isolated from each other, and a second Shelton-Butler matrix creates multiple directive beams in an azimuth plane.
    • 矩阵馈送圆阵列系统包括多个天线,与天线通信的多个方位角矩阵,以及与方位角矩阵通信的多个仰角矩阵。 阵列系统形成MxN光束,其中M是方位角光束的数量,N是仰角光束的数量。 在另一个实施例中,通过使用包括多个混合器的Shelton-Butler或Butler矩阵,当通信信号被输入到系统中时,系统输出彼此隔离的全向煎饼状辐射图。 在另一个实施例中,系统使用包括两个Shelton-Butler矩阵的波束形成网络。 Shelton-Butler矩阵中的第一个产生彼此隔离的全向煎饼束,第二个Shelton-Butler矩阵在方位平面中创建多个指向光束。
    • 2. 发明申请
    • Multi-band antenna for wireless applications
    • 用于无线应用的多频带天线
    • US20050057410A1
    • 2005-03-17
    • US10895813
    • 2004-07-20
    • Bing ChiangMichael LynchDouglas Wood
    • Bing ChiangMichael LynchDouglas Wood
    • H01Q1/24H01Q5/00H01Q5/357H01Q5/364H01Q9/40H01Q9/42H01Q11/02
    • H01Q1/243H01Q5/357H01Q5/364H01Q9/40H01Q9/42
    • A folded monopole antenna that supports lower and upper frequency bands may be used in CDMA, WLAN, or other wireless communications systems. The folded monopole antenna may be located in a handset next to a vertical ground plane. The folded monopole antenna may be folded at least twice and connected to the ground plane through a reactance. The dimensions of different sections of the folded monopole antenna define lower and upper frequency band characteristics, and an offset location of an input feed affects the bandwidth of the frequency bands. The reactance between the antenna and ground plane can be selected to fine tune the frequency bands. Various input feeds, including a co-planar waveguide, may be employed. Dynamically adjustable reactances may be used in the input feed and ground line for adapting the antenna to various environments.
    • 支持较低和较高频带的折叠式单极天线可用于CDMA,WLAN或其他无线通信系统。 折叠的单极天线可以位于靠近垂直接地平面的手机中。 折叠的单极天线可以折叠至少两次,并通过电抗连接到接地平面。 折叠单极天线的不同部分的尺寸限定较低和较高的频带特性,并且输入馈送的偏移位置影响频带的带宽。 可以选择天线和接地平面之间的电抗来微调频带。 可以采用包括共面波导在内的各种输入馈送。 可以在输入进给和接地线中使用动态可调电抗,以使天线适应各种环境。
    • 9. 发明申请
    • Moment based method for feature indentification in digital images
    • 基于矩阵的方法,用于数字图像中的特征识别
    • US20070248268A1
    • 2007-10-25
    • US11409905
    • 2006-04-24
    • Douglas Wood
    • Douglas Wood
    • G06K9/46G06K9/00
    • G06K9/3233G06K9/00134
    • A method for identifying features in digital images. The method includes, providing a digital image of a plurality of pixels having one or more features to be identified; providing a feature model having one or more parameters characteristic of a feature to be identified, wherein the feature model has a centroid; and distributing a plurality of test Regions of Interest (ROIs) over the digital image, so that every pixel of the digital image is covered by one or more test ROIs, wherein each test ROI has the same parameter(s) as the feature model, including its centroid. The method then includes for each test ROI, calculating the intensity moment of the image region bounded by the test ROI and if the centroid of the test ROI is offset from the intensity moment, moving the test ROI closer to the intensity moment and reiterating these steps until the centroid and intensity moment have substantially converged, and then processing the next test ROI; determining which ROIs are candidate ROIs; removing duplicate ROIs where two or more candidate ROIs identify the same feature; and outputting the list of candidate ROIs, the positions of which identify the features of interest in the provided image.
    • 一种用于识别数字图像中的特征的方法。 该方法包括:提供具有一个或多个要识别的特征的多个像素的数字图像; 提供具有要识别的特征的一个或多个参数特征的特征模型,其中所述特征模型具有质心; 并且在数字图像上分布多个测试感兴趣区域(ROI),使得数字图像的每个像素被一个或多个测试ROI覆盖,其中每个测试ROI具有与特征模型相同的参数, 包括其重心。 然后,该方法包括对于每个测试ROI,计算由测试ROI限定的图像区域的强度时刻,并且如果测试ROI的质心偏离强度时刻,则将测试ROI移动到更接近强度时刻并重复这些步骤 直到质心和强度时刻基本上收敛,然后处理下一个测试ROI; 确定哪些ROI是候选ROI; 消除重复的ROI,其中两个或多个候选ROI识别相同的特征; 并输出候选ROI的列表,其候选位置识别所提供的图像中感兴趣的特征。