公开(公告)号：US20070279286A1

公开(公告)日：2007-12-06

申请号：US11422238

申请日：2006-06-05

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

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

IPC分类号： H01Q1/38

CPC分类号： H01Q9/0407 ,  H01Q9/0442 ,  H01Q19/005

摘要： 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.

摘要翻译： 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

申请人： Thua Ho ,  Wai-Cheung Tang

发明人： Thua Ho ,  Wai-Cheung Tang

IPC分类号： G08B13/14 ,  G08G1/065

CPC分类号： H01Q1/38 ,  H01Q1/2225 ,  H01Q9/42 ,  H01Q23/00

摘要： 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.

摘要翻译： 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

申请人： Jeffrey Zhu ,  Wai-Cheung Tang

发明人： Jeffrey Zhu ,  Wai-Cheung Tang

IPC分类号： G08G1/00

CPC分类号： G07B15/063

摘要： 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.

摘要翻译： 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

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

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

IPC分类号： H04B1/44

CPC分类号： G07B15/063 ,  G07B15/06

摘要： 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.

摘要翻译： 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

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

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

IPC分类号： G08G1/065

CPC分类号： G07B15/063 ,  G07C5/008 ,  G07C5/085 ,  G08G1/017

摘要： 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.

摘要翻译： 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

申请人： Wai-Cheung Tang

发明人： Wai-Cheung Tang

IPC分类号： H01P1/208 ,  H01P7/06

CPC分类号： H01P1/2082

摘要： 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.

摘要翻译： 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。

公开(公告)号：US20100022202A1

公开(公告)日：2010-01-28

申请号：US12571033

申请日：2009-09-30

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

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

IPC分类号： H04B1/44

CPC分类号： G07B15/063 ,  G07B15/06

摘要： 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.

摘要翻译： 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：US07463197B2

公开(公告)日：2008-12-09

申请号：US11252162

申请日：2005-10-17

申请人： Gholamreza Zeinolabedin Rafi ,  Safieddin Safavi-Naeini ,  Sujeet K. Chaudhuri ,  Wai-Cheung Tang

发明人： Gholamreza Zeinolabedin Rafi ,  Safieddin Safavi-Naeini ,  Sujeet K. Chaudhuri ,  Wai-Cheung Tang

IPC分类号： H01Q1/38

CPC分类号： H01Q9/0407 ,  H01Q5/35 ,  H01Q9/0428 ,  H01Q9/0442

摘要： A multi-band antenna for multi-band radio frequency telecommunications. The multi-band antenna includes a conductive patch separated from a ground plane by a dielectric material. A slot pattern formed in the conductive patch defines a perimeter substantially surrounding two feed pins and arranged symmetrically about a center line. The slot pattern includes one or more inwardly extending arms projected along axes that pass between the two feed pins. The axes may be parallel to the center line. The slot pattern may be arranged using folded slots. In one embodiment, circular polarization is realized at GPS frequency by using one feed pin and linear or circular polarization is realized by using one or two feed pins for other bands. The feed pins may be controlled independently without a fixed phase and amplitude arrangement necessary to achieve a fixed polarization (linear, circular, or elliptical), which allows for adaptive pattern and polarization agility.

摘要翻译： 一种用于多频段射频通信的多频带天线。 多频带天线包括通过电介质材料与接地平面分离的导电贴片。 形成在导电贴片中的槽图形限定了基本上围绕两个进给销的周边，并围绕中心线对称地布置。 狭槽图案包括一个或多个向内延伸的臂，其沿着穿过两个进给销之间的轴线突出。 轴可以平行于中心线。 槽形图案可以使用折叠槽布置。 在一个实施例中，通过使用一个馈送引脚在GPS频率处实现圆偏振，并且通过使用一个或两个馈送引脚用于其它频带来实现线性或圆偏振。 可以独立地控制馈送引脚，而不需要固定的相位和幅度布置来实现固定偏振（线性，圆形或椭圆形），这允许自适应图案和极化敏捷性。

公开(公告)号：US20070085741A1

公开(公告)日：2007-04-19

申请号：US11252162

申请日：2005-10-17

申请人： Gholamreza Rafi ,  Safieddin Safavi-Naeini ,  Sujeet Chaudhuri ,  Wai-Cheung Tang

发明人： Gholamreza Rafi ,  Safieddin Safavi-Naeini ,  Sujeet Chaudhuri ,  Wai-Cheung Tang

IPC分类号： H01Q1/38

CPC分类号： H01Q9/0407 ,  H01Q5/35 ,  H01Q9/0428 ,  H01Q9/0442

摘要： A multi-band antenna for multi-band radio frequency telecommunications. The multi-band antenna includes a conductive patch separated from a ground plane by a dielectric material. A slot pattern formed in the conductive patch defines a perimeter substantially surrounding two feed pins and arranged symmetrically about a center line. The slot pattern includes one or more inwardly extending arms projected along axes that pass between the two feed pins. The axes may be parallel to the center line. The slot pattern may be arranged using folded slots. In one embodiment, circular polarization is realized at GPS frequency by using one feed pin and linear or circular polarization is realized by using one or two feed pins for other bands. The feed pins may be controlled independently without a fixed phase and amplitude arrangement necessary to achieve a fixed polarization (linear, circular, or elliptical), which allows for adaptive pattern and polarization agility.

摘要翻译： 一种用于多频段射频通信的多频带天线。 多频带天线包括通过电介质材料与接地平面分离的导电贴片。 形成在导电贴片中的槽图形限定了基本上围绕两个进给销的周边，并围绕中心线对称地布置。 狭槽图案包括一个或多个向内延伸的臂，其沿着穿过两个进给销之间的轴线突出。 轴可以平行于中心线。 槽形图案可以使用折叠槽布置。 在一个实施例中，通过使用一个馈送引脚在GPS频率处实现圆偏振，并且通过使用一个或两个馈送引脚用于其它频带来实现线性或圆偏振。 可以独立地控制馈送引脚，而不需要固定的相位和幅度布置来实现固定偏振（线性，圆形或椭圆形），这允许自适应图案和极化敏捷性。

公开(公告)号：US07183976B2

公开(公告)日：2007-02-27

申请号：US10895783

申请日：2004-07-21

申请人： Ke-Li Wu ,  Yong Huang ,  Wai-Cheung Tang

发明人： Ke-Li Wu ,  Yong Huang ,  Wai-Cheung Tang

IPC分类号： H01Q1/38

CPC分类号： H01Q9/0421 ,  H01Q1/36 ,  H01Q1/38 ,  H01Q9/42

摘要： A compact inverted-F antenna having a radiator arm formed from portions disposed in two parallel spaced apart planes and connected together electrically to form a folded meander-line topology. The planes may be defined by the surfaces of a dielectric substrate and the radiator arm may be formed from upper and lower conductive traces printed on either side of the dielectric substrate and interconnected serially through filled via holes. The antenna includes a ground plane parallel to and spaced apart from the radiator arm. The ground plane may be a grid conductive wall formed from filled via holes through the dielectric substrate.

摘要翻译： 一种紧凑的倒F天线，其具有由设置在两个平行间隔开的​​平面中的部分形成的散热器臂，并且电连接在一起以形成折叠的曲折线拓扑。 平面可以由电介质基板的表面限定，并且散热器臂可以由印刷在电介质基板的任一侧上的上和下导电迹线形成，并且通过填充的通孔串联连接。 天线包括平行于散热器臂并与散热器臂间隔开的接地平面。 接地平面可以是由通过电介质基板的填充通孔形成的栅格导电壁。