CN103311674A - EAS (electronic article surveillance) antenna system and anti-theft detection method thereof - Google Patents

EAS (electronic article surveillance) antenna system and anti-theft detection method thereof Download PDF

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CN103311674A
CN103311674A CN 201210061333 CN201210061333A CN103311674A CN 103311674 A CN103311674 A CN 103311674A CN 201210061333 CN201210061333 CN 201210061333 CN 201210061333 A CN201210061333 A CN 201210061333A CN 103311674 A CN103311674 A CN 103311674A
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antenna
eas
antenna system
transmission
field
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CN 201210061333
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Chinese (zh)
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吴国明
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杭州上立电子科技有限公司
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Abstract

The invention discloses an EAS (electronic article surveillance) antenna system which comprises an A antenna, a B antenna and a control circuit. The A antenna is a single ring; the B antenna is a complex ring comprising four rings; the A antenna and the B antenna are tightly overlapped; and the control circuit is used for controlling sending and receiving working states of the A antenna and the B antenna. The invention also provides an anti-theft detection method of the EAS antenna system. Any one of three working modes can be randomly selected; and the antenna system sends an energy field to a detection region and receives a label signal entering the energy field and processes the label signal. The balance of the EAS detection region distribution and the direction distribution is effectively improved and the reliability of the EAS is improved.

Description

—种EAS天线系统及其防盗检测方法 - kind of EAS antenna system and intrusion detection method

[0001] [0001]

技术领域 FIELD

[0002] 本发明涉及一种天线系统,特别涉及ー种EAS天线系统及其防盗检测方法。 [0002] The present invention relates to an antenna system, in particular EAS antenna system and intrusion detection method involves ー species.

背景技术 Background technique

[0003] EAS (Electronic Article Surveillance,即电子防盗系统)的天线系统通常都是包含两个天线架,其中一个天线架内的天线作为信号的发射架,另ー个做为信号的接收架,两个天线架的中间空间为监测区域。 [0003] EAS (Electronic Article Surveillance, i.e. an electronic security system) antenna systems are typically comprises two antenna mount, in which the antenna as a transmitting antenna mount frame signal as a received frame other ー signal, two the intermediate space antennas to monitor shelf area. 也有一些系统只需要使用一个天线架子,这种天线架子集合了发射和接收的功能,特别是在一些场地要求比较严格的地方,这类系统用的特别多。 Some systems have only one antenna shelf, this shelf antenna transmitting and receiving the set of functions, especially in some areas more stringent space requirements, particularly with such systems.

[0004] 单天线架EAS (电子防盗系统)的基本工作原理是:先发射信号建立ー个能量场(即磁场能量),当符合要求的标签进入这个能量场的时候,标签会对信号产生响应,系统接收这个响应并进行处理。 [0004] The single antenna mount the EAS (electronic article surveillance) basic operating principle is: to transmit a signal to establish ー energy field (i.e., magnetic energy), to meet the requirements when the tag enters the field, the tag will produce a response signal the system receives and processes the response.

[0005] 在这种情况下,对于EAS (电子防盗系统)来说,因为信号在各个区域和方向上的分布是不一样的,这样就会导致在ー些方向和区域无法检测到标签信号。 [0005] In this case, the EAS (Electronic Article Surveillance), because the distribution of signals on the respective regions and directions are not the same, this will lead in the direction ー some areas and can not detect the tag signal. 因此天线系统的形状和工作方式就变得很重要了。 Therefore, the shape and mode of operation of the antenna system becomes very important.

[0006] 市场现在的单天线架系统基本都存在着在ー些方向和区域无法检测到标签信号的问题。 [0006] Current market shelf single antenna systems there is a problem in the basic directions and some ー region can not detect the tag signal. 要做到对于任意方向进入的标签都能做到检测,就意味着在要在检测区域建立一个水平方向和垂直方向強度都能满足一定要求的能量场,同过对市场现有的各类天线系统的測量发现,目前尚无人做到这点。 To do in any direction into the detection of label can do, it means you want to establish a regional level in the detection and vertical strength can meet certain requirements of the energy field, with over existing types of antennas on the market measurement system found that there were no people to do so.

发明内容 SUMMARY

[0007] 本发明所要解决的技术问题是,提供ー种EAS天线系统及其防盗检测方法,该天线系统能有效保证EAS检测区域分布和方向分布的均衡性,其检测可靠性高。 [0007] The present invention solves the technical problem is to provide EAS antenna system and method for intrusion detection ー species, the antenna system can effectively ensure a balanced distribution of the EAS detection zone and a distribution of directions of its high detection reliability.

[0008] 本发明的技术方案:为了解决上述技术问题,本发明对天线系统的形状、布局、结构进行了如下改进: [0008] The aspect of the present invention: In order to solve the above problem, the antenna system of the present invention, shape, layout, structure of the following improvements:

包括A天线和B天线,A天线是ー个单环,B天线是ー个包括4个环的复环,A天线和B天线紧密重叠排列; Including antenna A and antenna B, A ー antenna is a single ring, B is ー antenna comprising a ring of four complex, A and antenna B antennas closely arranged to overlap;

该天线系统还包括ー个用于控制A天线、B天线发送与接收工作状态的控制电路。 The antenna system further comprises a ー for controlling the antenna A, antenna B transmits a control circuit receiving operation state.

[0009] 所述的A天线、B天线位于同一个平面内。 A Antenna [0009] The A, B lie in the same plane antenna.

[0010] 所述的控制电路包括发送电路和接收电路,分别控制天线系统的发送与接收工作状态。 Said control circuit [0010] includes a transmitting and receiving circuits respectively control the operating state of the transmission and reception antenna system.

[0011] 所述的控制电路上设置有A控制开关和B控制开关,A控制开关控制A天线的发送与接收工作状态,B控制开关控制B天线的发送与接收工作状态。 A control switch is provided with a control switch and B, A switching control controls the transmission and reception antenna A working state, B B control switch controls the transmission and reception antenna on the operating state of the control circuit [0011].

[0012] 为了解决上述技术问题,本发明不仅采用了前述的天线系统的形状、布局、结构,还通过相应的防盗检测方法去进ー步实现:选定如下三种工作模式中的ー种: [0012] To solve the above problems, the present invention not only uses the shape of the antenna system, layout, structure, also go into further achieved by a corresponding ー theft detection method: Selected ー following three kinds of operating modes:

(1)A天线处于发送或接收工作状态,同时B天线处于待机状态; (1) A transmitting or receiving antenna is in the operating state, while the antenna B is in a standby state;

(2) B天线处于发送或接收工作状态,同时A天线处于待机状态; (2) B transmitting or receiving antenna is in the operating state, a standby state while the antenna A;

(3) A天线、B天线同时处于发送或接收工作状态。 (3) A antennas, B is transmitting or receiving antennas simultaneously operating state.

[0013] 天线系统向检测区域发送能量场,接收进入能量场的标签信号并作出处理。 [0013] The antenna system transmits the energy field to the detection zone, the tag receives the incoming signal energy field and handle.

[0014] 所述的天线系统向检测区域发送能量场时,发送电路工作,接收电路待机;天线系统接收进入能量场的标签信号时,接收电路工作,发送电路待机。 [0014] When the antenna system transmits the energy field to the detection region, the transmission circuit, a reception circuit standby; tag when the antenna system receives an incoming signal energy field, reception circuit, transmission circuit standby.

[0015] 在所述的工作模式(I)中,开启A控制开关,重复以下工作过程:A天线向检测区域发送ー个垂直于天线平面的能量场,发送完毕后,接收进入该能量场的标签信号并作出处理,同时B天线处于待机状态。 [0015] In the operation mode (I), a control switch A is turned on, the following work procedure is repeated: A transmitting antenna ー energy field vertical to the antenna plane to the detection region, the transmission is completed, the energy field to enter the receiving tag signal and handle, while the antenna B is in a standby state.

[0016] 在所述的工作模式(2)中,开启B控制开关,重复以下工作过程:B天线向检测区域发送ー个平行于天线平面的能量场,发送完毕后,接收进入该能量场的标签信号并作出处理,同时A天线处于待机状态。 [0016] In the mode of operation (2), open the control switch B, the following work procedure is repeated: B ー antenna transmission antenna plane parallel to the energy field to the detection region, the transmission is completed, the energy field to enter the receiving tag signal and handle, while the antenna A in a standby state.

[0017] 在所述的工作模式(3)中,开启A控制开关和B控制开关,重复以下工作过程:A天线和B天线各自向检测区域发送ー个垂直于天线平面的能量场和ー个平行于天线平面的能量场,发送完毕后,分别接收进入各自能量场的标签信号并作出处理。 [0017] In the operating mode (3), open the control switch A and B control switch, repeating the work process: A and B antennas each transmitting antenna ー vertical plane to the detection area of ​​the antenna field and a ーparallel to the antenna plane of the field, after the transmission is completed, they receive incoming label field of each of the signal and handle.

[0018] 本发明将EAS (电子防盗系统)产品的天线系统分为A天线、B天线和控制电路三部分,且A天线采用单环结构,B天线采用包括4个环的复环结构,安装时将A天线和B天线紧密重叠,并使两者处于同一个平面内。 [0018] The present invention is the EAS (electronic article surveillance) system is divided into three product antenna portion of the antenna A, B, and antenna control circuit, and the antenna uses a single ring structure A, B antenna using a multiplexed ring structure of ring 4, mounted when the closely overlapping antenna a and antenna B, and both are in the same plane. B天线所包括的环的数量合适,不仅能保证发送的磁场能量均匀分布,而且控制了成本和缠绕难度。 The number of ring B include a suitable antenna, not only to ensure uniform distribution of the magnetic energy transmitted, and the control winding cost and difficulty. 根据当前工作情况和周围环境,通过A控制开关和B控制开关的控制,即可方便控制A天线与B天线的工作状态,因此有效提高了EAS检测区域分布和方向分布的均衡性,提高了EAS的可靠性。 According to the current work and the surrounding environment, through the A and B control switch control switch, to facilitate control of the state of the antenna A and antenna B, thus effectively improving the balance EAS detection region distribution and direction of the distribution, improved EAS reliability.

附图说明 BRIEF DESCRIPTION

[0019] 图1是A天线的结构示意图; [0019] FIG. 1 is a schematic diagram of the antenna structure A;

图2是B天线的结构示意图; FIG 2 is a schematic diagram of the antenna structure B;

图3是A天线和B天线重叠放置后的结构示意图; 3 is a schematic structure of the A and B antennas placed one antenna;

图4是A天线的磁场分布图; FIG 4 is a magnetic field distribution A of FIG antenna;

图5是B天线的磁场分布图。 FIG 5 is a magnetic field distribution B of the antenna of FIG.

具体实施方式 detailed description

[0020] 本发明的实施例1:该天线系统包括A天线I和B天线2,A天线I是ー个单环,即呈现ー个环状的结构,如图1所示,B天线2是ー个包括4个环的复环,复环表示包括至少有两个环状的结构,本发明的B天线2总共有4个环状结构,如图2所示。 [0020] Example 1 of the present invention: the antenna system comprises an antenna A and antenna B I 2, I A is the antenna ー monocyclic, i.e. presenting ー cyclic structure, shown in Figure 1, the antenna 2 is Bー a ring comprising 4 rings of complex, the complex comprising at least two ring represents a ring structure, B 2 antenna of the present invention a total of four cyclic structures, as shown in FIG. 当环的数量过少吋,发送的磁场能量分布不够均匀,当环的数量过多时,虽然磁场能量分布会更均匀,但是其制造成本会上升,且增加缠绕难度,因此B天线2采用4个环的结构不仅能够使发送的磁场能量分布均匀,满足需求,而且能有效控制制造成本以及缠绕难度。 When the number of rings is too small inch magnetic energy transmitted distribution is not uniform enough, when an excessive number of rings, although the magnetic field energy distribution is more uniform, but the manufacturing costs will rise, and increased winding difficult, and therefore B antennas 2 with four the ring structure can not only make the magnetic field distribution of the energy transmitted, to meet the needs, and can effectively control the manufacturing cost and the difficulty of winding. A天线I和B天线2紧密重叠排列,且位于同一个平面内,如图3所示。 Antenna A and antenna B I 2 closely arranged to overlap, and within the same plane, as shown in FIG.

[0021] 该天线系统还包括一个控制电路,附图中未标示出,该控制电路包括发送电路和接收电路,用于分别控制A天线1、B天线2的发送与接收工作状态。 [0021] The antenna system further comprises a control circuit, not shown in the drawings, the control circuit includes a transmission circuit and a reception circuit, respectively, for controlling the antenna A 1, B transmitting and receiving antenna 2 operating state.

[0022] 具体的控制方式通过在所述的控制电路上设置A控制开关和B控制开关来实现,A控制开关控制A天线I的发送与接收工作状态,B控制开关控制B天线2的发送与接收エ作状态。 [0022] DETAILED control mode by setting the A and B control switches on the control circuit controls the switches to achieve, A control switch controls the transmission and reception antenna A working state of I, B B control switch controls the transmission antenna 2 and Ester for receiving state.

[0023] 本发明具体的防盗检测方法如下: [0023] Specific anti-theft detection method of the present invention are as follows:

开启A控制开关,使A天线I处于发送或接收工作状态。 A control switch is turned on, the A-I in the antenna transmits or receives operation state.

[0024] 首先,发送电路工作,接收电路待机,A天线I先向检测区域发送ー个垂直于天线平面的能量场(磁场能量),发送完毕后,发送电路待机,接收电路工作,A天线I接收进入该能量场的标签信号并作出处理,至此完成一次收发,并依次反复,在整个过程中,B天线2处于待机状态。 [0024] First, the transmission circuit, a reception circuit standby, A transmit antenna I Xianxiang ー detection region to the vertical plane of the antenna energy field (magnetic energy), after the transmission is completed, a standby transmission circuit, reception circuit, A antenna I receiving an incoming signal from the energy field label and handle, thereby completing a transceiver, and sequentially repeatedly, throughout the process, B 2 antenna in a standby state. 其中,A天线I发送的磁场能量如图4所示。 Wherein the magnetic field energy transmitted from antenna A I shown in FIG.

[0025] 本发明的实施例2:天线系统的形状、排列、结构同实施例1,区别在于工作状态: 开启B控制开关,使B天线2处于发送或接收工作状态,开启控制开关B,使B天线2处 [0025] Example 2 of the present invention: the shape of the antenna system, the arrangement, the structure in Example 1, except that the operating states: Open B control switch the antenna B 2 is transmitting or receiving operation state, opening the control switch B, so that 2 the antenna B

于发送或接收工作状态。 To transmit or receive operation.

[0026] 首先,发送电路工作,接收电路待机,B天线2先向检测区域发送ー个平行于天线平面的能量场,发送完毕后,发送电路待机,接收电路工作,B天线2接收进入该能量场的标签信号并作出处理,至此完成一次收发,并依次反复,在整个过程中,A天线I处于待机状态。 [0026] First, the transmission circuit, a reception circuit standby, B transmitting antenna 2 Xianxiang ー detection area parallel to the antenna plane of the field, after the transmission is completed, a standby transmission circuit, reception circuit, B energy enters the receiving antenna 2 tag and handle the signal field, thereby completing a transceiver, and sequentially repeatedly, throughout the process, a I antennas in the standby state. 其中,B天线2发送的磁场能量分布如图5所示。 Wherein the magnetic field energy transmitted from the antenna B 2 distribution shown in Fig.

[0027] 本发明的实施例3:天线系统的形状、排列、结构同实施例1,区别在于工作状态: 开启A控制开关和B控制开关,使A天线I和B天线2均处于发送或接收工作状态。 [0027] Example 3 of the present invention: the shape of the antenna system, the arrangement, the structure in Example 1, except that the operating states: Open A control switch and B control switch the antenna A I and B antennas 2 are in the transmission or reception working condition.

[0028] 对于A天线1:首先,发送电路工作,接收电路待机,A天线I先向检测区域发送ー个垂直于天线平面的能量场(如图4所示),发送完毕后,发送电路待机,接收电路工作,A天线I接收进入该能量场的标签信号并作出处理,至此完成一次收发,并依次反复,在整个过程中,B天线2处于待机状态。 [0028] Antenna 1 for A: First, the transmission circuit, a reception circuit standby, the detection area A transmission antenna I Xianxiang ー antenna plane vertical to the energy field (FIG. 4), after the transmission is completed, a standby transmission circuit receiving circuit, a tag antenna into the reception I signal and the energy field to process, thereby completing a transceiver, and sequentially repeatedly, throughout the process, B 2 antenna in a standby state.

[0029] 对于B天线2:首先,发送电路工作,接收电路待机,B天线2先向检测区域发送ー个平行于天线平面的能量场(如图5所示),发送完毕后,发送电路待机,接收电路工作,B天线2接收进入该能量场的标签信号并作出处理,至此完成一次收发,并依次反复。 [0029] For antenna B 2: First, the transmission circuit, a reception circuit standby, antenna B transmits the detection region 2 Xianxiang ー antenna plane parallel to the energy field (FIG. 5), after the transmission is completed, a standby transmission circuit , reception circuit, B into the tag antenna 2 receives the signal and handle the energy field, thereby completing a transceiver, and sequentially repeated.

[0030] 在本实施例中,能够同时检测到进入垂直于天线平面以及平行于天线平面的能量场的标签信号。 [0030] In the present embodiment, it can be detected simultaneously into the plane perpendicular to the antenna and a tag signal energy field parallel to the antenna plane.

[0031] 天线系统的以上三种工作状态可以根据当前工作情况以及周围环境,通过控制电路随时进行切換,保证了各个方向上信号的強度与均匀性,标签信号检测カ度大大提高。 The above three modes of operation [0031] The antenna system may be based on the current work and the ambient, by the control circuit to switch at any time to ensure the strength and uniformity in all directions, the tag detection signal of the signal greatly improved grades. 其中,在三个实施例中所提及的天线平面指的是A天线和B天线所在的平面,垂直于天线平面指的是垂直于A天线和B天线所在的平面,从图3中看,就是垂直于纸面的方向;平行干天线平面指的是平行于A天线和B天线所在的平面,从图3中看,就是平行于纸面的方向。 Wherein, in the embodiment mentioned planar antenna refers to a planar antenna A and antenna B located in three embodiments, perpendicular to the antenna plane refers to a plane perpendicular to the antenna A and the antenna B is located, as viewed from FIG. 3, It is the direction perpendicular to the paper surface; dry antenna plane parallel refers antenna parallel to the plane a and B of the antenna is located, as viewed from FIG. 3, is the direction parallel to the paper surface.

Claims (9)

  1. 1.ー种EAS天线系统,其特征在于:该天线系统包括A天线和B天线,A天线是ー个单环,B天线是ー个包括4个环的复环,A天线和B天线紧密重叠排列; 该天线系统还包括ー个用于控制A天线、B天线发送与接收工作状态的控制电路。 1. ー species EAS antenna system, wherein: the antenna system comprises an antenna A and antenna B, A ー antenna is a single ring, B is ー antenna comprising a complex ring of ring 4, antenna A and antenna B close overlap arrangement; ー the antenna system further comprises a control for the antenna a, antenna B transmits a control circuit receiving operation state.
  2. 2.根据权利要求1所述的EAS天线系统,其特征在干:所述的A天线、B天线位于同一个平面内。 2. EAS antenna system according to claim 1, characterized in that the dry: the antenna A, B lie in the same plane antenna.
  3. 3.根据权利要求1所述的EAS天线系统,其特征在于:所述的控制电路包括发送电路和接收电路,分别控制天线系统的发送与接收工作状态。 3. EAS antenna system according to claim 1, wherein: said control circuit includes a transmission circuit and a reception circuit, transmission and reception control the operating state of the antenna system.
  4. 4.根据权利要求1所述的EAS天线系统,其特征在于:所述的控制电路上设置有A控制开关和B控制开关,A控制开关控制A天线的发送与接收工作状态,B控制开关控制B天线的发送与接收工作状态。 4. The EAS antenna system of claim 1, wherein: A is provided with a control switch and a control switch on the B control circuit, controls the switching control A operating state of the transmission and reception antennas A, B controls the control switch operating state transmitting and receiving antenna B.
  5. 5.一种如权利要求1至4任意一项权利要求所述的EAS天线系统的防盗检测方法,其特征在于:选定如下三种工作模式中的ー种: (1)A天线处于发送或接收工作状态,同时B天线处于待机状态; (2) B天线处于发送或接收工作状态,同时A天线处于待机状态; (3) A天线、B天线同时处于发送或接收工作状态; 天线系统向检测区域发送能量场,接收进入能量场的标签信号并作出处理。 5. A method as claimed in any one of claims 1 to 4, claims theft detection method according to claim EAS antenna system, wherein: the selected ー kinds of the following three operating modes: (1) A transmitting antenna is or receiving operation state, while the antenna B is in a standby state; an antenna system to a detector; (2) B antenna is transmitting or receiving operation state while the A antenna is in a standby state; (. 3) antenna A, antenna B while in transmitting or receiving operation state transmission energy field area, receive an incoming tag signal energy field and handle.
  6. 6.根据权利要求5所述的EAS天线系统的防盗检测方法,其特征在于:所述的天线系统向检测区域发送能量场时,发送电路工作,接收电路待机;天线系统接收进入能量场的标签信号时,接收电路工作,发送电路待机。 The intrusion detection method according to an EAS antenna system as claimed in claim, wherein: said antenna system transmits the energy field to the detection region, the transmission circuit, a reception circuit idle; an antenna system receives the tag enters the field signal, reception circuit, transmission circuit standby.
  7. 7.根据权利要求5所述的EAS天线系统的防盗检测方法,其特征在干:在所述的工作模式(I)中,开启A控制开关,重复以下工作过程:A天线向检测区域发送ー个垂直于天线平面的能量场,发送完毕后,接收进入该能量场的标签信号并作出处理,同时B天线处于待机状态。 The intrusion detection method according to an EAS antenna system as claimed in claim, characterized in that the dry: in said operation mode (I), a control switch A is turned on, the following work procedure is repeated: A transmitting antenna to a detection region ーenergy field to the vertical plane of the antenna, after completion of transmission, reception of the signal energy into the tag field and handle, while the antenna B is in a standby state.
  8. 8.根据权利要求5所述的EAS天线系统的防盗检测方法,其特征在干:在所述的工作模式(2)中,开启B控制开关,重复以下工作过程:B天线向检测区域发送ー个平行于天线平面的能量场,发送完毕后,接收进入该能量场的标签信号并作出处理,同时A天线处于待机状态。 The intrusion detection method according to an EAS antenna system as claimed in claim, characterized in that the dry: in the mode of operation (2), the control switch B is turned on, repeating the work process: an antenna B transmits to the detection region ーthe antenna plane parallel to the energy field, after completion of transmission, reception of the signal energy into the tag field and handle, while the antenna a in a standby state.
  9. 9.根据权利要求5所述的EAS天线系统的防盗检测方法,其特征在干:在所述的工作模式(3)中,开启A控制开关和B控制开关,重复以下工作过程:A天线和B天线各自向检测区域发送ー个垂直于天线平面的能量场和ー个平行于天线平面的能量场,发送完毕后,分别接收进入各自能量场的标签信号并作出处理。 9. The intrusion detection method according to an EAS antenna system as claimed in claim, characterized in that the dry: in the mode of operation (3), open the control switch A and switch B control, the working process is repeated: A and antenna each antenna B transmits ー vertical to the detection area of ​​the antenna plane and the field ー antenna plane parallel to the energy field, after the transmission is completed, receives incoming label field of each of the signal and handle.
CN 201210061333 2012-03-09 2012-03-09 EAS (electronic article surveillance) antenna system and anti-theft detection method thereof CN103311674A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4679046A (en) * 1984-12-21 1987-07-07 Senelco Limited Transponder systems
CN1185865A (en) * 1995-05-30 1998-06-24 传感电子公司 EAS system antenna configuration for providing improved interrogation field distribution
CN100576766C (en) * 2002-09-04 2009-12-30 杨晓晖 Method for antenna system monitoring electronic article, and its configuration
WO2010126549A1 (en) * 2009-04-30 2010-11-04 Checkpoint Systems, Inc. Phase coupler for rotating fields
CN202487781U (en) * 2012-03-09 2012-10-10 杭州上立电子科技有限公司 EAS (electronic article surveillance) antenna system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4679046A (en) * 1984-12-21 1987-07-07 Senelco Limited Transponder systems
CN1185865A (en) * 1995-05-30 1998-06-24 传感电子公司 EAS system antenna configuration for providing improved interrogation field distribution
CN100576766C (en) * 2002-09-04 2009-12-30 杨晓晖 Method for antenna system monitoring electronic article, and its configuration
WO2010126549A1 (en) * 2009-04-30 2010-11-04 Checkpoint Systems, Inc. Phase coupler for rotating fields
CN202487781U (en) * 2012-03-09 2012-10-10 杭州上立电子科技有限公司 EAS (electronic article surveillance) antenna system

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