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公开(公告)号：US06882251B2
公开(公告)日：2005-04-19
申请号：US10314352
申请日：2002-12-09
Applicant: Ming Yu , Van Dokas , Wai-Cheung Tang
Inventor： Ming Yu , Van Dokas , Wai-Cheung Tang
CPC classification number: H01P1/2053 , H01P1/20
Abstract: The invention provides a method and apparatus for a adaptively predistorted filter which has a transfer function that satisfies performance criteria specified for at (east one property of the filter. The transfer function is obtained by adaptively predistorting the transfer function poles to meet the performance criteria such that at least one of the poles is shifted by a unique amount.
Abstract translation: 本发明提供一种自适应预失真滤波器的方法和装置，其具有满足在（滤波器的东一特性）规定的性能标准的传递函数，传递函数通过自适应地预失真传递函数极点来获得，以满足性能标准 极点中的至少一个偏移了一个独特的量。
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公开(公告)号：US4881051A
公开(公告)日：1989-11-14
申请号：US227788
申请日：1988-08-03
Applicant: Wai-Cheung Tang , Richard J. Cameron , David M. T. Bryant
Inventor： Wai-Cheung Tang , Richard J. Cameron , David M. T. Bryant
CPC classification number: H01P1/2084 , H01P1/2138 , H01P7/10
Abstract: A two, three or four channel multiplexer can be operated in the TE.sub.01.delta. or HE.sub.11.delta. modes, each channel of the multiplexer has one bandpass filter, with each filter usually having a plurality of cavities. One cavity of each filter is a common cavity with all of the other filters of the multiplexer. The common cavity contains one independent dielectric quarter-cut or half-cut image resonator for each filter representing a channel of the multiplexer. Each resonator is mounted on a suitable support the common cavity provides a common junction and contains a loop coupling to couple electromagnetic energy between the various channels. The multiplexer has at least one input and at least one output. Previous microwave multiplexers have a plurality of bandpass filters arranged on a coaxial manifold. With the multiplexer of the present invention, the manifold can be eliminated. Further, at the S-band or L-band, substantial weight and volume savings can be achieved using the multiplexer of the present invention without sacrificing performance. This can be very important for space applications.
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公开(公告)号：US4644305A
公开(公告)日：1987-02-17
申请号：US804079
申请日：1985-12-03
Applicant: Wai-Cheung Tang , Joseph Frenna , David Siu
Inventor： Wai-Cheung Tang , Joseph Frenna , David Siu
CPC classification number: H01P1/2082
Abstract: An odd order bandpass filter has at least one cavity resonating at its resonant frequency in three independent orthogonal modes. The filter has at least one feedback coupling that is made to resonate and change sign at a center frequency. When the filter has two cavities, one being a triple cavity and the other being a dual mode cavity, the filter can be operated to achieve an elliptic function response. Also, the filter of the present invention can achieve a weight and volume reduction when compared to six-pole dual mode filters.
Abstract translation: 奇数阶带通滤波器在三个独立的正交模式中具有在其谐振频率处谐振的至少一个空腔。 滤波器具有至少一个反馈耦合，其使得在中心频率处共振并改变符号。 当过滤器具有两个空腔时，一个是三腔，另一个是双模腔，可以操作该过滤器以实现椭圆函数响应。 此外，与六极双模式滤波器相比，本发明的滤波器可以实现重量和体积减小。
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公开(公告)号：US20080278347A1
公开(公告)日：2008-11-13
申请号：US12117902
申请日：2008-05-09
Applicant: Thua Van Ho , Wai-Cheung Tang
Inventor： Thua Van Ho , Wai-Cheung Tang
IPC: G08G1/00
CPC classification number: G07B15/063
Abstract: An ETC system that uses lane-based phased array antennas to create both wide zone coverage areas upstream of the toll location and narrow zone coverage areas to complete transaction processing and vehicle location functions at the toll location. The phased array antennas are partly directed upstream with respect to the direction of travel in the roadway and they are each positioned to create a series of coverage areas generally parallel to the direction of travel and generally centered within a laneway.
Abstract translation: 使用基于车道的相控阵天线的ETC系统在收费位置和窄区域覆盖区域的上游创建宽区域覆盖区域，以在收费位置完成交易处理和车辆位置功能。 相控阵天线相对于道路中的行进方向部分地指向上游，并且它们各自定位成产生一系列覆盖区域，该区域通常平行于行进方向并且通常以巷道为中心。
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公开(公告)号：US20080218313A1
公开(公告)日：2008-09-11
申请号：US12044783
申请日：2008-03-07
Applicant: Loek d'Hont , Charles T. Coyle , Paul Manuel , Martin Capper , Wai-Cheung Tang , William P. Montague , Mark G. Barberio
Inventor： Loek d'Hont , Charles T. Coyle , Paul Manuel , Martin Capper , Wai-Cheung Tang , William P. Montague , Mark G. Barberio
CPC classification number: G06Q30/0603 , H04Q2213/13095
Abstract: A system and method to facilitate drive-through ordering in which two or more options are presented to a customer and an in-vehicle transponder includes an input device to receive customer selection of one of the two or more options. The user selection received via the input device is relayed to the vendor through RF communications between the transponder and a reader.
Abstract translation: 一种用于促进驱动通过排序的系统和方法，其中向客户和车载应答器呈现两个或多个选项，其包括用于接收客户选择两个或更多个选项之一的输入设备。 通过输入设备接收的用户选择通过应答器和读取器之间的RF通信中继到供应商。
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Patent Agency Ranking
26.发明申请公开(公告)号：US20080061943A1
公开(公告)日：2008-03-13
申请号：US11504823
申请日：2006-08-11
Applicant: Ke-Li Wu , Hong-Yang Wang , Da-Cheng Wei , Ying-Zeng Yin , Wai-Cheung Tang
Inventor： Ke-Li Wu , Hong-Yang Wang , Da-Cheng Wei , Ying-Zeng Yin , Wai-Cheung Tang
IPC: H04Q5/22
CPC classification number: G06K19/0723 , G06K7/0008 , G06K19/0707 , G06K19/0712
Abstract: A method of operating an RFID system and an RFID system in a power-saving mode are disclosed. In one embodiment, the system comprises at least one reader and at least one tag. The at least one reader may transmit a wake-up signal to the at least one tag when turning on, and the at least one tag stays alternatively in a sniff mode and a sleep mode at an alternative period before receiving the wake-up signal. The method may comprise modulating the wake-up signal by using N time markers.
Abstract translation: 公开了一种以省电模式操作RFID系统和RFID系统的方法。 在一个实施例中，系统包括至少一个读取器和至少一个标签。 当接通唤醒信号时，至少一个读取器可以在打开时向至少一个标签发送唤醒信号，并且至少一个标签在嗅觉模式和休眠模式下交替存在。 该方法可以包括通过使用N个时间标记来调制唤醒信号。
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公开(公告)号：US07342500B2
公开(公告)日：2008-03-11
申请号：US11388737
申请日：2006-03-24
Applicant: Thua Van Ho , Wai-Cheung Tang
Inventor： Thua Van Ho , Wai-Cheung Tang
IPC: G08B13/14
CPC classification number: H01Q1/38 , H01Q1/2225 , H01Q9/42 , H01Q23/00
Abstract: A transponder formed on a circuit substrate having a longitudinal axis and a transverse axis. An antenna is disposed on one side of a transverse axis, extending in a longitudinal direction, and the remaining circuit components are disposed on the other side of the transverse axis. The remaining circuit components may include a controller, an RF transceiver, and a battery. A ground plane defines an antenna space within which the antenna is disposed.
Abstract translation: 形成在具有纵向轴线和横向轴线的电路基板上的应答器。 天线设置在横向轴线的一个纵向方向上延伸的一侧，其余电路部件设置在横轴的另一侧。 剩余的电路组件可以包括控制器，RF收发器和电池。 接地平面定义天线设置在其内的天线空间。
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28.发明申请公开(公告)号：US20070268140A1
公开(公告)日：2007-11-22
申请号：US11437236
申请日：2006-05-19
Applicant: Wai-Cheung Tang , Thua Van Ho
Inventor： Wai-Cheung Tang , Thua Van Ho
CPC classification number: G06K19/0723 , G06K7/10346
Abstract: A method and system for communicating state information from a transponder to a reader. The transponder outputs linearly polarized RF signals having either a first polarization, such as horizontal, or a second polarization, such as vertical. The polarization is selected so as to indicate a first state or a second state. The reader detects whether received RF signals have the first polarization or the second polarization, and thereby determines the state of the transponder. In some embodiments, the reader may include two linearly polarized antennas, one with the first polarization and one with the second polarization, for receiving the RF signals from the transponder and determining the polarization of the received RF signals. The system may be implemented within an electronic toll collection system, wherein the transponders are affixed to the interior of vehicle windshields using a rotatable mounting mechanism having two selectable positions.
Abstract translation: 一种用于将状态信息从应答器传送到读取器的方法和系统。 转发器输出具有诸如水平的第一极化或诸如垂直的第二极化的线性偏振RF信号。 选择极化以指示第一状态或第二状态。 读取器检测接收的RF信号是否具有第一极化或第二极化，从而确定应答器的状态。 在一些实施例中，读取器可以包括两个线性极化天线，一个具有第一偏振的天线，另一个具有第二极化，用于从应答器接收RF信号并确定所接收的RF信号的极化。 该系统可以在电子收费系统内实现，其中应答器使用具有两个可选位置的可旋转安装机构固定在车辆挡风玻璃的内部。
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公开(公告)号：US07233260B2
公开(公告)日：2007-06-19
申请号：US10959468
申请日：2004-10-05
Applicant: Wai-Cheung Tang , Thua Van Ho
Inventor： Wai-Cheung Tang , Thua Van Ho
CPC classification number: G07B15/063 , G08G1/017
Abstract: An improved electronic toll collection system having two lane-based antennas per laneway. The antennas include an overhead antenna and a side mount antenna. The side mount antenna is disposed so as to communicate especially with license plate transponders. The two antennas are coupled to a transaction processing system for conducting toll transaction communications with a vehicle-mounted transponder through one of the two antennas.
Abstract translation: 一种改进的电子收费系统，每个巷道具有两个基于车道的天线。 天线包括架空天线和侧面安装天线。 侧面安装天线布置成特别与牌照转发器进行通信。 两个天线耦合到交易处理系统，用于通过两个天线中的一个与车载转发器进行长途交易通信。
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公开(公告)号：US20060176153A1
公开(公告)日：2006-08-10
申请号：US11054520
申请日：2005-02-09
Applicant: Wai-Cheung Tang
Inventor： Wai-Cheung Tang
IPC: H04Q5/22
CPC classification number: G06K19/0723 , G06K19/0707
Abstract: A transponder for use in a vehicular RF communications system, such as an electronic toll collection system or the like. The transponder includes an electromechanical generator for converting the kinetic energy of the vehicle into electrical energy for powering the control electronics and/or RF transceiver electronics of the transponder. The electromechanical generator may charge an energy storage element, such as capacitor or a battery, which is then used as a power source by the transponder electronics. The electromechanical generator may be implemented using microelectromechanical system (MEMS) technology. In one embodiment, the MEMS generator is an inductive microelectromechanical generator including a permanent magnet, a spring, and an electrical coil. In another embodiment, the MEMS generator is a capacitive microelectromechanical generator including a mechanical variable capacitor, switches and control electronics.
Abstract translation: 一种用于车载RF通信系统的应答器，例如电子收费系统等。 应答器包括用于将车辆的动能转换成电能的机电发电机，以为发射机应答器的控制电子设备和/或RF收发器电子设备供电。 机电发电机可以对诸如电容器或电池的能量存储元件进行充电，然后电容器或电池通过应答器电子器件用作电源。 机电发电机可以使用微机电系统（MEMS）技术来实现。 在一个实施例中，MEMS发生器是包括永磁体，弹簧和电线圈的感应微机电发电机。 在另一个实施例中，MEMS发生器是包括机械可变电容器，开关和控制电子器件的电容式微机电发电机。
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