技术领域technical field
本发明涉及RFID电子标签领域，尤其涉及RFID读取器的天线技术领域。The invention relates to the field of RFID electronic tags, in particular to the technical field of antennas of RFID readers.
背景技术Background technique
双频RFID工作在两个频点上，低频用于读头向标签发射能量电磁波，高频用于标签向读头发射信息。他们的频段分别是，低频几百KHz，高频几MHz。高频天线在接收标签发出的高频电磁波的同时，也能接收到来自空间的各种电磁波。由于高频频段正处于广播电台的中波和短波频段，实验证明，当空间存在频率相近的广播电台的电磁波时，读头的高频接收电路将受到严重的干扰，使读头读取标签的距离大大缩短。Dual-frequency RFID works on two frequency points, the low frequency is used for the reading head to transmit energy electromagnetic waves to the label, and the high frequency is used for the label to transmit information to the reading head. Their frequency bands are hundreds of KHz for low frequency and several MHz for high frequency. The high-frequency antenna can receive various electromagnetic waves from space while receiving the high-frequency electromagnetic waves emitted by the tag. Since the high-frequency frequency band is in the medium-wave and short-wave frequency bands of broadcasting stations, experiments have proved that when there are electromagnetic waves of broadcasting stations with similar frequencies in the space, the high-frequency receiving circuit of the reading head will be seriously interfered, so that the reading head can read the label. The distance is greatly shortened.
发明内容Contents of the invention
为了克服标签读取器天线存在的上述干扰问题，本发明提供了一种RFID标签读取器的抗干扰天线。In order to overcome the above-mentioned interference problems existing in the tag reader antenna, the present invention provides an anti-jamming antenna for the RFID tag reader.
本发明为实现上述目的所采用的技术方案是：一种RFID标签的抗干扰天线，标签6读取器天线外圈设置至少一个由导线环接而成的闭合线圈环3。The technical solution adopted by the present invention to achieve the above purpose is: an anti-jamming antenna for RFID tags. The outer ring of the tag 6 reader antenna is provided with at least one closed coil ring 3 formed by looping wires.
所述标签6为双频RFID标签，标签读取器天线为环形低频天线2和环形高频天线1。The tag 6 is a dual-frequency RFID tag, and the tag reader antenna is a loop low-frequency antenna 2 and a loop high-frequency antenna 1 .
所述标签6为有源标签，标签读取器天线为高频天线1。The tag 6 is an active tag, and the tag reader antenna is a high-frequency antenna 1 .
所述闭合线圈环3内设置至少一套标签天线。At least one set of tag antennas is arranged in the closed coil loop 3 .
本发明的RFID标签读取器的抗干扰天线，在天线的外圈加一个闭合线圈环，产生一个抵抗电磁场阻止外部交变电磁场的变化，有效实现了标签读头天线的抗干扰功能。In the anti-jamming antenna of the RFID tag reader of the present invention, a closed coil loop is added to the outer ring of the antenna to generate an anti-electromagnetic field to prevent the change of the external alternating electromagnetic field, and effectively realize the anti-jamming function of the tag reading head antenna.
附图说明Description of drawings
图1是双频RFID读头的天线原理图。Figure 1 is a schematic diagram of the antenna of a dual-frequency RFID read head.
图2是本发明加入闭合线圈环的双频RFID读取器的天线原理图。Fig. 2 is a schematic diagram of the antenna of the dual-frequency RFID reader added with a closed coil loop according to the present invention.
图3是本发明加入闭合线圈环的双频RFID读取器天线磁场原理图。Fig. 3 is a schematic diagram of the antenna magnetic field of the dual-frequency RFID reader added with a closed coil loop according to the present invention.
图4是本发明RFID标签和闭合线圈环的工作原理图。Fig. 4 is a working principle diagram of the RFID tag and the closed coil loop of the present invention.
图5是本发明加入闭合线圈环的有源标签天线原理图。Fig. 5 is a schematic diagram of an active tag antenna added with a closed coil loop according to the present invention.
图6是本发明RFID标签读取器多套天线外部设有闭合线圈原理图。Fig. 6 is a schematic diagram of multiple sets of antennas of the RFID tag reader provided with closed coils outside the present invention.
图中：1、高频天线，2、低频天线，3、闭合线圈环，4、外部电磁场，5、抵抗电磁场，6、标签，7、闭合磁力线。In the figure: 1. High-frequency antenna, 2. Low-frequency antenna, 3. Closed coil ring, 4. External electromagnetic field, 5. Resistance to electromagnetic field, 6. Label, 7. Closed magnetic field lines.
具体实施方式Detailed ways
双频RFID标签读头的天线一般包含两个环形天线：一个低频天线2，一个高频天线1，其布局如图1所示，天线的布局也可以是低频天线在里圈，高频天线在外圈。当RFID双频标签接近天线电磁波的覆盖范围内时，读头就能读取到标签发出的信息。高频天线在接收标签发出的高频电磁波的同时，也能接收到来自空间的各种电磁波。实验证明，当空间存在频率相近的广播电台的电磁波时，读头的高频接收电路将受到严重的干扰。The antenna of the dual-frequency RFID tag reading head generally includes two loop antennas: a low-frequency antenna 2 and a high-frequency antenna 1. The layout is shown in Figure 1. The layout of the antenna can also be that the low-frequency antenna is in the inner circle and the high-frequency antenna is outside. lock up. When the RFID dual-frequency tag is close to the coverage of the electromagnetic wave of the antenna, the reading head can read the information sent by the tag. The high-frequency antenna can receive various electromagnetic waves from space while receiving the high-frequency electromagnetic waves emitted by the tag. Experiments have proved that when there are electromagnetic waves from radio stations with similar frequencies in the space, the high-frequency receiving circuit of the reading head will be seriously disturbed.
本发明提出了一种屏蔽外部干扰的天线设计方法，即在天线的外圈加一个闭合线圈环3，如图2所示，这个闭合线圈环3是由导线环接而成，位于原天线的外圈。The present invention proposes an antenna design method for shielding external interference, that is, adding a closed coil ring 3 to the outer ring of the antenna, as shown in Figure 2, the closed coil ring 3 is formed by wire loops and is located at the original antenna outer ring.
法拉第定律表明，当外部交变电磁场4穿过一个闭合线圈环3时，闭合线圈环3中将产生交变电流。而线圈中的这个电流又将产生一个抵抗电磁场5去阻止外部交变电磁场4的变化，这个阻止作用就是对外部电磁波的屏蔽，如图3所示。Faraday's law shows that when an external alternating electromagnetic field 4 passes through a closed coil loop 3 , an alternating current will be generated in the closed coil loop 3 . The current in the coil will generate a resisting electromagnetic field 5 to prevent the change of the external alternating electromagnetic field 4. This preventing effect is to shield the external electromagnetic wave, as shown in FIG. 3 .
由于标签尺寸小，又位于闭合线圈环3的空间内，标签6所发出的电磁场产生的闭合磁力线7是闭合的，这样的闭合电磁波不会在闭合线圈3中产生电流，因此不会被屏蔽，如图4所示。Due to the small size of the tag and its location in the space of the closed coil ring 3, the closed magnetic force lines 7 generated by the electromagnetic field emitted by the tag 6 are closed. Such closed electromagnetic waves will not generate current in the closed coil 3, so they will not be shielded. As shown in Figure 4.
对于有源标签，标签带电池，主动发射电磁波信号，因此读头天线没有低频发射天线，采用同样的方法所构成的天线图5所示。For active tags, the tag has a battery and actively emits electromagnetic wave signals, so the read head antenna does not have a low-frequency transmitting antenna. The antenna formed by the same method is shown in Figure 5.
闭合线圈环3内还可以有多套天线，如图6所示。There may also be multiple sets of antennas in the closed coil loop 3 , as shown in FIG. 6 .
本发明是通过实施例进行描述的，本领域技术人员知悉，在不脱离本发明的精神和范围的情况下，可以对这些特征和实施例进行各种改变或等效替换。另外，在本发明的教导下，可以对这些特征和实施例进行修改以适应具体的情况及材料而不会脱离本发明的精神和范围。因此，本发明不受此处所公开的具体实施例的限制，所有落入本申请的权利要求范围内的实施例都属于本发明的保护范围。The present invention has been described by means of embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, the features and examples may be modified to adapt a particular situation and material to the teachings of the invention without departing from the spirit and scope of the invention. Therefore, the present invention is not limited by the specific embodiments disclosed here, and all embodiments falling within the scope of the claims of the present application belong to the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510436348.XACN105048060A (en) | 2015-07-23 | 2015-07-23 | Anti-interference antenna for RFID tag reader |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510436348.XACN105048060A (en) | 2015-07-23 | 2015-07-23 | Anti-interference antenna for RFID tag reader |
| Publication Number | Publication Date |
|---|---|
| CN105048060Atrue CN105048060A (en) | 2015-11-11 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510436348.XAPendingCN105048060A (en) | 2015-07-23 | 2015-07-23 | Anti-interference antenna for RFID tag reader |
| Country | Link |
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| CN (1) | CN105048060A (en) |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication | Application publication date:20151111 | |
| RJ01 | Rejection of invention patent application after publication |