公开(公告)号：US07813699B2

公开(公告)日：2010-10-12

申请号：US12571033

申请日：2009-09-30

Applicant: Thua Van Ho ,  Daniel Terrier ,  Roger Tong ,  Wai-Cheung Tang ,  Japjeev Kohli

Inventor： Thua Van Ho ,  Daniel Terrier ,  Roger Tong ,  Wai-Cheung Tang ,  Japjeev Kohli

IPC: H04B7/00

CPC classification number: G07B15/063 ,  G07B15/06

Abstract: An electronic toll collection system wherein the reader includes a switching network and a plurality of transceivers operating under the control of a controller. The reader further includes failure detection circuitry for determining whether any of the transceivers have failed based upon the RF outputs of the transceivers. If the controller determines that a transceiver has failed, then it alters the switching pattern such that the switching network excludes the failed transceiver from being connected to the antennas. The reader thereby provides for adaptive RF channel assignment, as the particular transceiver used to excite a particular antenna may be dynamically altered, and the provision of at least two transceivers in the reader ensures transceiver redundancy.

Abstract translation: 一种电子收费系统，其中读取器包括在控制器的控制下操作的交换网络和多个收发器。 读取器还包括故障检测电路，用于基于收发器的RF输出来确定是否有任何收发器发生故障。 如果控制器确定收发器出现故障，则它改变切换模式，使得交换网络排除故障收发器连接到天线。 因此，读取器提供了自适应RF信道分配，因为用于激发特定天线的特定收发机可以被动态地改变，并且在读取器中提供至少两个收发器确保收发机冗余。

公开(公告)号：US20070118273A1

公开(公告)日：2007-05-24

申请号：US11284277

申请日：2005-11-21

Applicant: Wai-Cheung Tang ,  Thua Ho

Inventor： Wai-Cheung Tang ,  Thua Ho

IPC: G08G1/00

CPC classification number: G08G1/042

Abstract: A method and system for obtaining traffic information regarding the travel time between two points using vehicle-mounted transponders. The system includes an upstream reader and a downstream reader. The upstream reader inserts a time stamp into a passing transponder. The downstream reader reads the time stamp and determines the travel time between the two readers. The downstream reader may accumulate a number of travel times from multiple transponders and calculate an average travel time. The downstream reader may then send the calculated travel time to a display sign for display to motorists. The displayed travel time may include a quantitative value or a qualitative assessment of the travel conditions.

Abstract translation: 一种用于使用车载发射机应答器获得关于两点之间的行进时间的交通信息的方法和系统。 该系统包括上游读写器和下游读卡器。 上游读写器将时间戳插入到传送的应答器中。 下游读卡器读取时间戳并确定两个读卡器之间的行进时间。 下游读取器可以从多个应答器累积多个行进时间并计算平均旅行时间。 然后，下游读取器可以将计算的行进时间发送到显示符号以显示给驾驶者。 显示的旅行时间可能包括定量值或旅行条件的定性评估。

公开(公告)号：US20070008184A1

公开(公告)日：2007-01-11

申请号：US11176758

申请日：2005-07-07

Applicant: Thua Ho ,  Roger Tong ,  Wai-Cheung Tang ,  Daniel Terrier ,  Martin Capper

Inventor： Thua Ho ,  Roger Tong ,  Wai-Cheung Tang ,  Daniel Terrier ,  Martin Capper

IPC: G08G1/01

CPC classification number: G08G1/042 ,  G07B15/063 ,  G08G1/015

Abstract: An electronic toll collection system with dynamically adjusted timing for operation of one or more subsystems. The timing is dynamically adjusted based upon the prevailing traffic speed for the roadway. The roadway traffic speed is determined based upon direct measurements of traffic speed by external equipment or based upon a variable correlated with traffic speed. The variable may include the average number of handshakes per transponder over an estimation period. The subsystem may include a vehicle position determination system, an enforcement system, a loop detection system, or other such subsystems.

Abstract translation: 一种具有动态调整的一个或多个子系统运行时序的电子收费系统。 根据道路的主要交通速度动态调整时间。 基于外部设备的交通速度的直接测量或基于与交通速度相关的变量来确定道路交通速度。 该变量可以包括每个转发器在估计期间的平均握手次数。 子系统可以包括车辆位置确定系统，执行系统，环路检测系统或其他这样的子系统。

公开(公告)号：US4513264A

公开(公告)日：1985-04-23

申请号：US448969

申请日：1982-12-13

Applicant: James B. Dorey ,  Wai-Cheung Tang

Inventor： James B. Dorey ,  Wai-Cheung Tang

IPC: H01P1/208 ,  H01P1/16

CPC classification number: H01P1/2082

Abstract: A bandpass filter 8 has a plurality of cascaded wave-guide cavities 11, 12 1N and inter-cavity coupling means 36, 37. One or more of the cavities 12, 1N is rotated relative to an input reference mode 52. The rotation causes quasi-orthogonal coupling structures to be introduced into said cavities 11, 12 1N. The rotation of one or more cavities enables symmetric or asymmetric amplitude and phase responses to be produced as desired.The filter can be used in channel multiplexers for satellite communication systems.

Abstract translation: 带通滤波器8具有多个级联的波导腔11,12N和腔间耦合装置36,37。空腔12,1N中的一个或多个相对于输入参考模式52旋转。旋转引起准 - 引入到所述空腔11,12N中的正交耦合结构。 一个或多个空腔的旋转使得能够根据需要产生对称或不对称的振幅和相位响应。 该滤波器可用于卫星通信系统的信道多路复用器。

公开(公告)号：US20070279286A1

公开(公告)日：2007-12-06

申请号：US11422238

申请日：2006-06-05

Applicant: Gordon Coutts ,  Raafat Mansour ,  Sujeet Chaudhuri ,  Wai-Cheung Tang

Inventor： Gordon Coutts ,  Raafat Mansour ,  Sujeet Chaudhuri ,  Wai-Cheung Tang

IPC: H01Q1/38

CPC classification number: H01Q9/0407 ,  H01Q9/0442 ,  H01Q19/005

Abstract: A multi-mode parasitic antenna array having two or more resonant frequencies. The multi-mode parasitic antenna array has at least two resonant modes resulting in substantially divergent radiation patterns, thereby providing the antenna with frequency dependent directivity. The array may be incorporated into a tag for an RFID system. The RFID system includes a reader capable of interrogating the tag at each of the resonant frequencies.

Abstract translation: 具有两个或更多个谐振频率的多模式寄生天线阵列。 多模式寄生天线阵列具有至少两个谐振模式，从而产生大体上发散的辐射图，从而为天线提供频率相关的方向性。 阵列可以并入用于RFID系统的标签中。 RFID系统包括能够在每个谐振频率处询问标签的读取器。

公开(公告)号：US20070222607A1

公开(公告)日：2007-09-27

申请号：US11388737

申请日：2006-03-24

Applicant: Thua Ho ,  Wai-Cheung Tang

Inventor： Thua Ho ,  Wai-Cheung Tang

IPC: G08B13/14 ,  G08G1/065

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。

公开(公告)号：US07262711B2

公开(公告)日：2007-08-28

申请号：US10969036

申请日：2004-10-20

Applicant: Jeffrey Zhu ,  Wai-Cheung Tang

Inventor： Jeffrey Zhu ,  Wai-Cheung Tang

IPC: G08G1/00

CPC classification number: G07B15/063

Abstract: An external indicator for use in proximity to an on-board unit or transponder for an electronic toll collection (ETC) system. The external indicator senses RF transmissions from the on-board unit and/or roadside readers of the ETC system and produces sensory outputs when transmissions are detected. The external indicator receives RF signals, demodulates them, and analyses the demodulated RF signals to determine if it has received a roadside reader trigger signal and/or a transponder response signal. A sensory indicator, such as a visual, auditory, or kinetic device, alerts an occupant of a vehicle to the detected RF transmissions and, accordingly, to the likely occurrence of an ETC transaction.

Abstract translation: 用于电子收费系统（ETC）系统的车载单元或应答器附近的外部指示器。 外部指示器感测来自ETC系统的车载单元和/或路侧读取器的RF传输，并且当检测到传输时产生感觉输出。 外部指示灯接收RF信号，对其进行解调，并分析解调的RF信号，以确定其是否已经接收到路边阅读器触发信号和/或应答器响应信号。 诸如视觉，听觉或动力学装置的感官指示器向车辆的乘客警告检测到的RF传输，并且因此警告ETC交易的可能发生。

公开(公告)号：US20070077896A1

公开(公告)日：2007-04-05

申请号：US11534052

申请日：2006-09-21

Applicant: Thua Ho ,  Daniel Terrier ,  Roger Tong ,  Wai-Cheung Tang

Inventor： Thua Ho ,  Daniel Terrier ,  Roger Tong ,  Wai-Cheung Tang

IPC: H04B1/44

CPC classification number: G07B15/063 ,  G07B15/06

Abstract: An electronic toll collection system wherein the reader includes a switching network and a plurality of transceivers operating under the control of a controller. The reader further includes failure detection circuitry for determining whether any of the transceivers have failed based upon the RF outputs of the transceivers. If the controller determines that a transceiver has failed, then it alters the switching pattern such that the switching network excludes the failed transceiver from being connected to the antennas. The reader thereby provides for adaptive RF channel assignment, as the particular transceiver used to excite a particular antenna may be dynamically altered, and the provision of at least two transceivers in the reader ensures transceiver redundancy.

Abstract translation: 一种电子收费系统，其中读取器包括在控制器的控制下操作的交换网络和多个收发器。 读取器还包括故障检测电路，用于基于收发器的RF输出来确定是否有任何收发器发生故障。 如果控制器确定收发器出现故障，则它改变切换模式，使得交换网络排除故障收发器连接到天线。 因此，读取器提供了自适应RF信道分配，因为用于激发特定天线的特定收发机可以被动态地改变，并且在读取器中提供至少两个收发器确保收发机冗余。

公开(公告)号：US20060255968A1

公开(公告)日：2006-11-16

申请号：US11409897

申请日：2006-04-24

Applicant: Henry Sun Woo ,  Wai-Cheung Tang ,  Paul Anthony Manuel ,  Weimin He ,  Daniel Terrier ,  Roger Tong

Inventor： Henry Sun Woo ,  Wai-Cheung Tang ,  Paul Anthony Manuel ,  Weimin He ,  Daniel Terrier ,  Roger Tong

IPC: G08G1/065

CPC classification number: G07B15/063 ,  G07C5/008 ,  G07C5/085 ,  G08G1/017

Abstract: A dual mode transponder for engaging in RF communications with a roadside reader from a vehicle. The transponder includes an antenna, an electronic toll collection (ETC) component, and an external interface. The ETC component implements a pre-defined ETC communications protocol to detect and interpret received signals and generate response signals when operating in an ETC mode. The ETC component also includes a bypass port. The external interface is coupled to the bypass port and has an external port for receiving input signals. The ETC component includes a bypass module for receiving a bypass instruction and entering a bypass mode. In the bypass mode the ETC component refrains from implementing the ETC communications protocol. Instead, the ETC component transmits the input signals relayed from the external interface to the ETC component to the reader.

Abstract translation: 一种用于从车辆与路边阅读器进行RF通信的双模式转发器。 应答器包括天线，电子收费（ETC）组件和外部接口。 ETC组件实现了预定义的ETC通信协议，用于检测和解释接收到的信号，并在ETC模式下工作时产生响应信号。 ETC组件还包括旁路端口。 外部接口耦合到旁路端口，并具有用于接收输入信号的外部端口。 ETC组件包括用于接收旁路指令并进入旁路模式的旁路模块。 在旁路模式下，ETC组件不执行ETC通信协议。 相反，ETC组件将从外部接口中继的输入信号发送到ETC组件到读卡器。

公开(公告)号：US5589807A

公开(公告)日：1996-12-31

申请号：US475656

申请日：1995-06-07

Applicant: Wai-Cheung Tang

Inventor： Wai-Cheung Tang

IPC: H01P1/208 ,  H01P7/06

CPC classification number: H01P1/2082

Abstract: Multi-mode waveguide filters are temperature compensated using dielectric material contained within at least one cavity of a filter. The variation in operating frequency of the filter that would otherwise result from changes in temperature is substantially balanced by a change in operating frequency with temperature caused by a change in a dielectric constant of the dielectric material so that the operating frequency of the filter remains substantially constant with temperature. The filter can have one or more dual-mode or triple-mode cavities. In a method of constructing and compensating a filter, the amount of dielectric material is selected so that the dielectric material does not resonate at the operating frequency of the cavity, the amount of dielectric material in the cavity being adjustable after each cavity is constructed. The cavity is operated with a fixed amount of dielectric material contained in the cavity for each mode and the change in operating frequency of the filter with temperature is determined. If the change in operating frequency of the filter is not at an acceptable level, the amount of dielectric material contained in the cavity for each mode is varied and the filter is operated through a range of temperatures to determine whether the change in operating frequency is then at an acceptable level. These steps are repeated until the change in operating frequency of the filter is at an acceptable level.

Abstract translation: 多模波导滤波器使用包含在滤波器的至少一个空腔内的介电材料进行温度补偿。 否则由温度变化引起的过滤器的工作频率变化基本上由介电材料的介电常数变化引起的工作频率随温度的变化平衡，使得过滤器的工作频率保持基本恒定 与温度。 滤波器可以具有一个或多个双模或三模腔。 在构造和补偿滤波器的方法中，选择介电材料的量使得介电材料在空腔的工作频率下不共振，在构造每个空腔之后，空腔中的电介质材料的量是可调节的。 腔体以每种模式包含在腔体中的固定量的电介质材料操作，并且确定具有温度的过滤器的工作频率的变化。 如果过滤器的工作频率的变化不在可接受的水平，则每种模式的空腔中包含的电介质材料的量会发生变化，并且过滤器在一定温度范围内运行，以确定工作频率的变化是否为 在可接受的水平。 重复这些步骤，直到过滤器的工作频率的变化处于可接受的水平。