专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明申请

WO1997037401A2 RADIO COMMUNICATION APPARATUS 审中-公开
标题翻译：无线电通信设备
公开(公告)号：WO1997037401A2
公开(公告)日：1997-10-09
申请号：PCT/GB1997000841
申请日：1997-03-26
申请人： SYMMETRICOM, INC. , LEISTEN, Oliver, Paul
发明人： SYMMETRICOM, INC.
IPC分类号： H01Q11/12
CPC分类号： H01Q11/08 , H01Q5/357
摘要： In a radio communication system operating in at least two spaced-apart frequency bands above 200 MHz, a quadrifilar helical antenna (1) having an elongate dielectric core with a relative dielectric constant greater than 5 has a conductive sleeve surrounding a proximal part of the core and a longitudinal feeder structure (1A) extending through the core to a connection with the helical antenna elements at a distal end of the core. The antenna (1) is operated in a first frequency band in which it exhibits a first, balanced mode of resonance characterised by current maxima and voltage minima at the connections of the helical elements to the feeder structure and at their junctions with the rim of the sleeve, and in a lower or higher second frequency band in which the antenna (1) exhibits a second, single-ended mode of resonance characterised by current maxima and voltage minima generally at the ends of the core and current minima and voltage maxima at one or more intermediate locations. To permit dual mode operation, the system includes an impedance-matching coupling stage (2) which may be a diplexer having filters coupled between a common port for the antenna (1) and further ports for connection to radio signal processing equipment such as a GPS receiver (4) and a mobile telephone (5) operating in the two frequency bands. The filters and impedance matching elements may be formed as microstrip elements on a single substrate.
摘要翻译：在高于200MHz的至少两个间隔开的频带中操作的无线电通信系统中，具有大于5的相对介电常数的细长介质芯的四极螺旋天线（1）具有包围芯的近端部分的导电套筒以及纵向进给结构（1A），其延伸穿过所述芯到与所述芯的远端处的所述螺旋天线元件的连接。天线（1）在第一频带中操作，其中它呈现出第一平衡谐振模式，其特征在于在螺旋元件到馈线结构的连接处的电流最大值和电压最小值，以及在与并且在较低或更高的第二频带中，其中天线（1）呈现第二单端谐振模式，其特征在于通常在芯的端部处的电流最大值和电压最小值，并且电流最小值和电压最大值在一个或更多的中间位置。为了允许双模式操作，该系统包括阻抗匹配耦合级（2），其可以是具有耦合在用于天线（1）的公共端口之间的滤波器的另一端口和用于连接到诸如GPS的无线电信号处理设备接收器（4）和在两个频带中操作的移动电话（5）。滤波器和阻抗匹配元件可以在单个衬底上形成为微带元件。

2. 发明申请

WO1998024144A1 A DIELECTRIC-LOADED ANTENNA 审中-公开
标题翻译：电介质天线
公开(公告)号：WO1998024144A1
公开(公告)日：1998-06-04
申请号：PCT/GB1997003217
申请日：1997-11-24
申请人： SYMMETRICOM, INC. , LEISTEN, Oliver, Paul , AGBORAW, Ebinotambong
发明人： SYMMETRICOM, INC.
IPC分类号： H01Q11/08
CPC分类号： H01Q1/242 , H01Q1/362 , H01Q5/371 , H01Q11/08
摘要： A dielectric-loaded loop antenna for operation at frequencies above 200 MHz has an elongate cylindrical core with a relative dielectric constant greater than 5, a pair of co-extensive helical antenna elements, a coaxial feeder structure extending through the core from a proximal end to a distal end where it is coupled to the antenna elements, and a balum formed on the core cylindrical surface and connected to the feeder structure at the proximal end of the core. Each helical antenna element is bifurcated at an intermediate position so that proximally, it is formed of two generally parallel branches each of which is coupled to a respective linking path around the core to meet a corresponding branch of the other elongate element therefore forming a conductive loop between the two conductors of the feeder structure. The two conductive loops have different electrical lengths as a result of, for example, the branches being of differents lengths. In a preferred embodiment, the linking paths around the core are formed by the rim of a split conductive sleeve constituting the balum. The sleeve is formed in two parts separated by a pair of longitudinally extending diametrically opposed quarter wave slits each of which extends from the space between the branches of a respective helical antenna element to a short circuited end adjacent the proximal end of the core.
摘要翻译：用于在高于200MHz的频率下工作的介质负载环形天线具有一个相对介电常数大于5的细长圆柱形芯，一对共同广泛的螺旋天线元件，同轴馈线结构，其从近端延伸穿过芯，远端，其连接到天线元件，以及形成在芯圆柱形表面上并连接到芯的近端处的馈送器结构的巴底液。每个螺旋天线元件在中间位置分叉，使得近端由两个大体上平行的分支形成，每个分支耦合到围绕芯的相应连接路径，以便与另一个细长元件的相应分支相接合，从而形成导电回路在馈线结构的两个导体之间。作为例如分支长度不同的结果，两个导电环具有不同的电长度。在优选实施例中，围绕芯部的连接路径由构成天花的分离导电套筒的边缘形成。套筒形成在两个部分之间，两个部分由一对纵向延伸的直径相对的四分之一波长狭缝分开，每个狭缝波长从相应的螺旋天线元件的分支之间的空间延伸到与芯的近端相邻的短路端。

3. 发明申请

WO1997042710A1 MULTIPLE INPUT FREQUENCY LOCKED LOOP 审中-公开
标题翻译：多路输入频率锁定环路
公开(公告)号：WO1997042710A1
公开(公告)日：1997-11-13
申请号：PCT/US1997007448
申请日：1997-05-02
申请人： SYMMETRICOM, INC. , ZAMPETTI, George
发明人： SYMMETRICOM, INC.
IPC分类号： H03L07/08
CPC分类号： G04G7/00 , H03L7/08 , H03L7/087 , H03L7/143 , H04J3/0688
摘要： A dual locked loop is disclosed comparing preferably a GPS signal with an E1 signal and the E1 signal with the output of the loop. The GPS signal is low pass filtered to provide a low pass filtered GPS versus E1 signal that is used as a calibration for a closed loop having a second low pass filter for filtering the comparisons of the E1 and the output signal. By appropriately selecting the filter parameters, the output stability can track the stability of the local oscillator driving the NCO for short term stability, the medium term stability of the E1 signal and the long term stability of the GPS signal.
摘要翻译：公开了一种双锁定环路，其优选地将GPS信号与E1信号和E1信号与环路的输出进行比较。 GPS信号被低通滤波以提供低通滤波的GPS对E1信号，该信号用作用于具有用于滤波E1和输出信号的比较的第二低通滤波器的闭环的校准。通过适当选择滤波器参数，输出稳定性可以跟踪驱动NCO的本地振荡器的短期稳定性，E1信号的中期稳定性和GPS信号的长期稳定性的稳定性。

4. 发明申请

WO1996039762A1 DISTRIBUTION OF SYNCHRONIZATION IN A SYNCHRONOUS OPTICAL ENVIRONMENT 审中-公开
标题翻译：同步光学环境中同步的分布
公开(公告)号：WO1996039762A1
公开(公告)日：1996-12-12
申请号：PCT/US1996008155
申请日：1996-05-31
申请人： SYMMETRICOM, INC.
发明人： SYMMETRICOM, INC. , NARASIMHA, Madihally , SHENOI, Kishan
IPC分类号： H04J03/06
CPC分类号： H04J3/0647 , H04J2203/0089
摘要： Apparatus and methods for distributing synchronization throughout a network is disclosed. The distribution of the synchronization is through the use of generating a reference timing signal, and by counting the line clock pulses between the start of a frame and the timing reference signal pulse at a first office and that count is then encoded and transmitted to the next office. At the next office, the transmitted count is decoded and used for regenerating synchronization by counting a number of received line clock pulses from the start of the frame to regenerate the reference timing signal. Particular criteria for selecting the frequencies for the timing reference signal are disclosed.
摘要翻译：公开了用于在整个网络中分发同步的装置和方法。同步的分布是通过使用产生参考定时信号，并且通过对第一个办公室的帧开始和定时参考信号脉冲之间的行时钟脉冲进行计数，然后对该计数进行编码并发送到下一个办公室。在下一个办公室，传送的计数被解码并用于通过从帧的开始计数接收到的行时钟脉冲的数量来再生同步，以再生基准定时信号。公开了用于选择定时参考信号的频率的特定标准。

5. 发明申请

WO1996039761A1 ENCODING SYSTEM FOR DISTRIBUTION OF SYNCHRONIZATION 审中-公开
标题翻译：用于分配同步的编码系统
公开(公告)号：WO1996039761A1
公开(公告)日：1996-12-12
申请号：PCT/US1996007909
申请日：1996-05-29
申请人： SYMMETRICOM, INC.
发明人： SYMMETRICOM, INC. , NARASIMHA, Midihally , SHENOI, Kishan
IPC分类号： H04J03/06
CPC分类号： H04J3/0647 , H04J2203/0089
摘要： Apparatus and methods for distributing synchronization throughout a network is disclosed. The distribution of the synchronization is through the use of generating a reference timing signal, and by counting the line clock pulses between the start of a frame and the timing reference signal pulse at a first office and that count is then encoded and transmitted to the next office. At the next office, the transmitted count is decoded and used for regenerating synchronization by counting a number of received line clock pulses from the start of the frame to regenerate the reference timing signal. Particular criteria for selecting the frequencies for the timing reference signal are disclosed.
摘要翻译：公开了一种用于在整个网络中分发同步的装置和方法。同步的分布是通过使用产生参考定时信号，并且通过对第一个办公室的帧起始点和定时参考信号脉冲之间的行时钟脉冲进行计数，然后对该计数进行编码并发送到下一个办公室。在下一个办公室，通过从帧的开始计数接收到的行时钟脉冲的数量来重新产生参考定时信号，将发送的计数解码并用于再生同步。公开了用于选择定时参考信号的频率的特定标准。

6. 发明申请

WO1996003679A1 DISCIPLINED TIME SCALE GENERATOR FOR PRIMARY REFERENCE CLOCKS 审中-公开
标题翻译：主要参考时钟的定时发电机
公开(公告)号：WO1996003679A1
公开(公告)日：1996-02-08
申请号：PCT/US1995009182
申请日：1995-07-20
申请人： SYMMETRICOM, INC.
发明人： SYMMETRICOM, INC. , ZAMPETTI, George, Philip
IPC分类号： G04G03/00
CPC分类号： H04J3/0688 , G04G7/02
摘要： Methods and apparatus are disclosed for providing disciplined clock signals at a plurality of nodes located throughout a network. In the preferred embodiments, a plurality of clocks are ensembled to provide ensemble time base information. A universal clock signal such as from a global positioning satellite (GPS) or Loran receiver is also provided and the ensembled time information is disciplined to the frequency or the phase of the universal clock signal to provide syntonisation or synchronization throughout the network.
摘要翻译：公开了用于在位于整个网络的多个节点处提供纪律时钟信号的方法和装置。在优选实施例中，合并多个时钟以提供整体时基信息。还提供了诸如来自全球定位卫星（GPS）或Loran接收机的通用时钟信号，并且将合并的时间信息记录到通用时钟信号的频率或相位，以在整个网络中提供同步或同步。

7. 发明申请

WO1998011623A1 DIELECTRIC-LOADED ANTENNA WITH RECESSED ANTENNA ELEMENTS 审中-公开
标题翻译：具吸收天线元件的电介质负载天线
公开(公告)号：WO1998011623A1
公开(公告)日：1998-03-19
申请号：PCT/US1997016590
申请日：1997-09-09
申请人： COORS CERAMICS COMPANY , SYMMETRICOM, INC.
发明人： COORS CERAMICS COMPANY , SYMMETRICOM, INC. , ANDERSON, Frank, E. , LEISTEN, Oliver, Paul , KNIGHT, James, E.
IPC分类号： H01Q01/36
CPC分类号： H01Q11/08 , H01Q1/362
摘要： A dielectric-loaded antenna for operation at frequencies over 200 MHz has a cylindrical ceramic core (12) with a relative dielectric constant greater than 5. The core is formed with recesses (34A, 34B, 34C, 34D) in its cylindrical outer surface and the recesses are filled with conductive material thereby forming a three-dimensional antenna element structure having antenna elements (10A, 10B, 10C, 10D) inlaid in the ceramic material and with their outer surfaces flush with the outer surface of the core. The antenna is manufactured by forming the core from the ceramic material when in a green state, firing the core, metallising the core outer surface whereby conductive material enters the recesses as well as covering other parts of the core outer surface, and then machining the metallised core to an extent such that conductive material is left in the recesses but portions of the core between the recesses are exposed. The recesses are generally rectangular in cross section such that the conductive antenna elements have well-defined edges of a predetermined thickness to provide low electrical resistance along the element sides where radio frequency currents are concentrated.
摘要翻译：用于在200MHz频率下操作的介质负载天线具有相对介电常数大于5的圆柱形陶瓷芯（12）。芯在其圆柱形外表面中形成有凹槽（34A，34B，34C，34D），并且凹部被导电材料填充，从而形成三维天线元件结构，其具有镶嵌在陶瓷材料中的天线元件（10A，10B，10C，10D），并且其外表面与芯的外表面齐平。天线通过在处于绿色状态时从陶瓷材料形成芯体，烧制芯体，对芯部外表面进行金属化，由此导电材料进入凹部以及覆盖芯部外表面的其它部分，然后加工金属化芯部的程度使得导电材料留在凹部中，但是凹部之间的芯部的部分被暴露。凹槽通常为矩形的横截面，使得导电天线元件具有预定厚度的明确限定的边缘，以沿射频电流集中的元件侧提供低电阻。

8. 发明申请

WO1997049171A3 DSP IMPLEMENTATION OF A CELLULAR BASE STATION RECEIVER 审中-公开
公开(公告)号：WO1997049171A3
公开(公告)日：1997-12-24
申请号：PCT/US1997010497
申请日：1997-06-16
申请人： SYMMETRICOM, INC.
发明人： SYMMETRICOM, INC. , SHENOI, Kishan
IPC分类号： H03D03/00

9. 发明申请

WO1997027642A1 ANTENNA FOR FREQUENCIES IN EXCESS OF 200 MHz 审中-公开
标题翻译：天线超过200 MHz的频率
公开(公告)号：WO1997027642A1
公开(公告)日：1997-07-31
申请号：PCT/GB1997000085
申请日：1997-01-10
申请人： SYMMETRICOM, INC. , LEISTEN, Oliver, Paul
发明人： SYMMETRICOM, INC.
IPC分类号： H01Q01/38
CPC分类号： H01Q11/08
摘要： A miniature antenna (10) for operation at frequencies in excess of 200 MHz has a ceramic core (12) in the form of a cylindrical rod having a relative dielectric constant greater than 5. Plated on the outer surfaces of the core is an antenna element structure comprising a single pair of oppositely disposed helical elements (10A, 10B) having a common central axis coincident with the central axis of the core. At a distal end of the antenna, they are connected to a coaxial feeder structure passing axially through the core, and at their proximal ends they are connected to the rim of a cylindrical trap conductor (20) which, at the proximal end of the core is coupled to the screen of the feeder structure. At the operating frequency, the antenna behaves as a loop, the radiation response having nulls directed generally perpendicularly on each side of a plane containing the central axis of the core and the connections of the helical elements with the feeder structure and with the conductive sleeve. The antenna is intended primarily for a handheld communication unit such as a cellular or cordless telephone handset, the present of the nulls in the radiation pattern reducing radiation into the user's head.
摘要翻译：用于在超过200MHz的频率下操作的微型天线（10）具有呈圆柱形棒形式的陶瓷芯（12），其具有大于5的相对介电常数。在芯的外表面上形成天线元件结构包括具有与芯的中心轴重合的公共中心轴线的单对相对设置的螺旋元件（10A，10B）。在天线的远端处，它们连接到轴向穿过芯部的同轴馈送结构，并且在它们的近端处，它们连接到圆柱形陷阱导体（20）的边缘，圆柱形陷阱导体在芯的近端处耦合到馈线结构的屏幕。在工作频率下，天线表现为一个环路，辐射响应的空值大致垂直地指向包含芯的中心轴的平面的每一侧，以及螺旋元件与馈线结构和导电套管的连接。该天线主要用于诸如蜂窝或无绳电话手机的手持通信单元，辐射图中的零点的存在将辐射减少到用户头部。

10. 发明申请

WO1997021109A1 MOBILE POSITION DETERMINATION 审中-公开
标题翻译：移动位置确定
公开(公告)号：WO1997021109A1
公开(公告)日：1997-06-12
申请号：PCT/GB1996002986
申请日：1996-12-03
申请人： SYMMETRICOM, INC. , FFOULKES-JONES, Geraint
发明人： SYMMETRICOM, INC.
IPC分类号： G01S05/14
CPC分类号： G01S19/07 , G01S19/04 , H04W64/00
摘要： Position determining apparatus comprises a cellular radio system including at least one base station having a base station satellite receiver (6) and position determination means including a cellular mobile station (50) coupled to a local satellite receiver (58), the base station being arranged to transmit base station satellite data including data representing a carrier phase measurement derived from a satellite signal (70) received by the base station satellite receiver (6) to the mobile station (50) via a cellular radio link and the position determination means being arranged to determine its position relative to the base station using local satellite data received by the local satellite receiver (58) and to correct errors in this position determination using base station satellite data. The relative positions of the base stations may be determined automatically with reference to an external positional reference. The external positional reference may be a satellite-based position determining system.
摘要翻译：位置确定装置包括：蜂窝无线电系统，包括具有基站卫星接收机（6）的至少一个基站和包括耦合到本地卫星接收机（58）的蜂窝移动台（50）的位置确定装置，所述基站被布置将基站卫星接收机（6）所接收的表示从卫星信号（70）导出的载波相位测量数据的基站卫星数据通过蜂窝无线电链路发射到移动台（50），并且布置位置确定装置使用本地卫星接收机（58）接收的本地卫星数据来确定其相对于基站的位置，并使用基站卫星数据来校正该位置确定中的错误。基站的相对位置可以参照外部位置参照自动确定。外部位置参考可以是基于卫星的位置确定系统。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式