公开(公告)号：US4342969A

公开(公告)日：1982-08-03

申请号：US194681

申请日：1980-10-06

申请人： Richard T. Myers ,  David L. Roberson

发明人： Richard T. Myers ,  David L. Roberson

IPC分类号： H01P5/02 ,  H01P7/00

CPC分类号： H01P7/005 ,  H01P5/02

摘要： Impedance matching between a helical resonator of a helical resonator filter and a circuit connected thereto is accomplished by the provision of a microstrip transmission line including a microstrip stub printed on a printed circuit board, the microstrip stub being short in comparison to the wavelength at the resonant frequency of the filter whereby the microstrip stub assumes the characteristics of an inductive impedance. A first electrical end of the microstrip stub is connected to a first terminal of the helical resonator and to a first terminal of the circuit, and a second electrical end of the microstrip stub is connected to a second terminal of the helical resonator and to a second terminal of the circuit.

摘要翻译： 螺旋谐振器滤波器的螺旋谐振器和与其连接的电路之间的阻抗匹配通过提供一种微带传输线来实现，微带传输线包括印刷在印刷电路板上的微带短截线，微带短截线与谐振时的波长相比较短 滤波器的频率，由此微带短截线呈现电感阻抗的特性。 微带短截线的第一电端连接到螺旋谐振器的第一端和电路的第一端，并且微带短截线的第二电端连接到螺旋谐振器的第二端，并连接到第二端 端子的电路。

公开(公告)号：US5365550A

公开(公告)日：1994-11-15

申请号：US732461

申请日：1991-07-18

申请人： David L. Roberson

发明人： David L. Roberson

IPC分类号： H04B1/7075 ,  H04B1/7085 ,  H04B1/7095 ,  H04L27/30

CPC分类号： H04B1/7075 ,  H04B1/7085 ,  H04B1/7095

摘要： A direct sequence digital spread spectrum receiver acquires and maintains synchronization in a reliable, yet simple manner, even under severe multipath and interference conditions. A sliding correlator and a voltage controlled crystal oscillator (VCXO) cooperate to acquire initial synchronization, and once synchronization is acquired, the VCXO is linearly frequency modulated (FM) for accurate tracking. The difficult problem of keeping the receiver code clock synchronized to that of the transmitter under severe multipath and interference conditions is solved by virtue of a dual switched bandwidth low pass filter section of the tracking circuit, allowing a wide bandwidth for initial acquisition and tracking but once the clocks are aligned, a narrow loop takes over that follows the transmitter closely. A commercially available intermediate frequency (IF) integrated circuit (IC) is used as an amplitude modulated (AM) detector to achieve the large dynamic range required. The IF IC has an internal received signal strength indicator (RSSI) output which is used to demodulate the amplitude variations generated by the tracking circuit.

摘要翻译： 直接序列数字扩频接收机即使在严重的多路径和干扰条件下也可以以可靠而简单的方式获取和维持同步。 滑动相关器和压控晶体振荡器（VCXO）协调获取初始同步，一旦获取同步，VCXO就被线性调频（FM）进行精确跟踪。 通过跟踪电路的双开关带宽低通滤波器部分解决了在严重的多路径和干扰条件下将接收器代码保持与发送器的时钟同步的困难问题，允许宽带宽用于初始采集和跟踪，但一次 时钟是对齐的，一个狭窄的环路接管发射机后紧跟着。 使用市售中频（IF）集成电路（IC）作为幅度调制（AM）检测器以实现所需的大动态范围。 IF IC具有用于解调由跟踪电路产生的振幅变化的内部接收信号强度指示符（RSSI）输出。

公开(公告)号：US5512878A

公开(公告)日：1996-04-30

申请号：US319263

申请日：1994-10-06

申请人： Brent Balch ,  David L. Roberson

发明人： Brent Balch ,  David L. Roberson

IPC分类号： G08B13/24 ,  G08B13/14

CPC分类号： G08B13/2477

摘要： An electronic article surveillance (EAS) system includes a transmitting antenna, a driver operable for exciting the transmitting antenna, a receiving antenna and circuitry connected to the receiving antenna for improving the quality of transmissions from the transmitting antenna. The driver excites the transmitting antenna at a preselected system operating frequency and the circuitry connected to the receiving antenna improves the quality of transmissions from the transmitting antenna by lessening harmonics of the operating frequency in the transmissions. The harmonics are attributable to protection diodes connected to the receiving antenna for limiting voltages impressed thereon and otherwise adversely impacting on the receiver tag signal processing circuitry. The harmonic lessening circuitry is connected in parallel with the protection diodes and is operative to lessen protection diode harmonic generation.

摘要翻译： 电子物品监视（EAS）系统包括发射天线，可操作以激发发射天线的驱动器，接收天线和连接到接收天线的电路，用于提高发射天线的传输质量。 驾驶员以预选的系统工作频率激励发射天线，并且连接到接收天线的电路通过减少传输中的工作频率的谐波来改善来自发射天线的传输质量。 谐波可归因于连接到接收天线的保护二极管，用于限制施加在其上的电压，否则不利地影响接收器标签信号处理电路。 谐波减轻电路与保护二极管并联连接，可以减少保护二极管谐波产生。

公开(公告)号：US06307151B1

公开(公告)日：2001-10-23

申请号：US09324111

申请日：1999-06-02

申请人： David L. Roberson

发明人： David L. Roberson

IPC分类号： H05K900

CPC分类号： H01M2/105

摘要： A technique for reducing low frequency baseband interference noise is disclosed. The low frequency baseband interference noise typically takes the form of low frequency magnetic interference emanating from a power source providing low frequency switching currents. The power source typically has a supply current terminal and an oppositely disposed return current terminal. The technique is realized by enclosing the power source in an electrically conductive sheath, wherein the electrically conductive sheath has an input terminal disposed proximate the supply current terminal and an output terminal disposed proximate the return current terminal. The output terminal is electrically connected to the return current terminal. Also, the electrically conductive sheath has an opening proximate the supply current terminal for allowing access to the supply current terminal.

摘要翻译： 公开了一种用于降低低频基带干扰噪声的技术。 低频基带干扰噪声通常采取从提供低频开关电流的电源发出的低频磁干扰的形式。 电源通常具有电源电流端子和相对设置的返回电流端子。 该技术通过将电源封装在导电护套中来实现，其中导电护套具有设置在电源电流端子附近的输入端子和靠近返回电流端子设置的输出端子。 输出端子与回流端子电连接。 此外，导电护套具有靠近电源端子的开口，用于允许接近电源端子。

公开(公告)号：US5189397A

公开(公告)日：1993-02-23

申请号：US820313

申请日：1992-01-09

申请人： Harry E. Watkins ,  David L. Roberson

发明人： Harry E. Watkins ,  David L. Roberson

IPC分类号： G08B13/24

CPC分类号： G08B13/2482 ,  G08B13/2471

摘要： A method and apparatus for determining the amplitude of a first magnetic field at a first fundamental frequency in a zone in which a second magnetic field is able to be present wherein first and second transmissions of a magnetic field at the fundamental frequency and different phases is carried out at different times, the field in the zone is detected for each transmission and the detected fields are processed to determine the magnitude of the first magnetic field.

摘要翻译： 一种用于确定能够存在第二磁场的区域中第一基频处的第一磁场的振幅的方法和装置，其中承载基频和不同相位的磁场的第一和第二传输 在不同时间，在每个传输中检测到区域中的场，并且处理检测到的场以确定第一磁场的大小。