CN210137007U - Antenna of electronic tag reader - Google Patents
Antenna of electronic tag reader Download PDFInfo
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- CN210137007U CN210137007U CN201920748215.XU CN201920748215U CN210137007U CN 210137007 U CN210137007 U CN 210137007U CN 201920748215 U CN201920748215 U CN 201920748215U CN 210137007 U CN210137007 U CN 210137007U
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Abstract
The utility model provides an electronic tags reader antenna, locate including circuit board and multiunit radio frequency antenna on the circuit board, every group radio frequency antenna include the antenna body and with the antenna circuit that the antenna body matches, antenna circuit is equipped with the branch road of taking the switch. The beneficial effects of the utility model reside in that: the multiple groups of the set radio frequency antennas can work in a time-sharing mode, when the current working radio frequency antenna reads the electronic tag, the whole resonant frequency of other non-working radio frequency antennas except the current working radio frequency antenna is enabled to deviate to the whole resonant frequency far away from the current working radio frequency antenna through the control switch, and therefore the purpose of reducing mutual influence among the multiple antennas is achieved.
Description
Technical Field
The utility model relates to a radio frequency identification technology, in particular to electronic tags reader antenna.
Background
The radio frequency identification is an automatic identification technology which utilizes electromagnetic waves to realize non-contact, and the adopted hardware comprises an electronic tag, an electronic tag reader and an electronic tag reader antenna, wherein the electronic tag is generally bound with a product attached to the electronic tag, and the electronic tag reader reads the electronic tag through radio frequency communication generated between the electronic tag reader antenna and the electronic tag, so that the purposes of identifying the product and further performing anti-counterfeiting, tracking and checking on the product are achieved.
In the prior art, if a large number of products with electronic tags are stacked together (for example, the stacking length exceeds 30cm), multiple groups of radio frequency antennas are required to be arranged for reading, and in order to avoid radio frequency performance degradation caused by too long antenna body length of a single radio frequency antenna, multiple antenna bodies with limited length (generally limited within 30cm) are required to be arranged for reading, but in such a case, mutual influence between the radio frequency antennas is large, because the overall resonant frequency of the radio frequency antenna and its matching circuit (including inductance, capacitance, resistance, etc.) is often adjusted to be near a certain value (generally corresponding to the carrier frequency of a wireless protocol) to improve the success rate of reading, and the approach of the overall resonant frequency under the condition that multiple radio frequency antennas are used close to or staggered causes serious wireless energy coupling between the antennas, resulting in performance degradation, and the like, Resulting in missed read string reads and other undesirable consequences.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: an electronic tag reader antenna is provided that maintains radio frequency reading performance in close proximity or staggered use.
In order to solve the technical problem, the utility model discloses a technical scheme be:
the antenna of the electronic tag reader comprises a circuit board and a plurality of groups of radio frequency antennas arranged on the circuit board, wherein each group of radio frequency antennas comprises an antenna body and an antenna circuit matched with the antenna body, and the antenna circuit is provided with a branch with a switch.
Further, the branch is connected in series between the antenna body and the antenna circuit matched with the antenna body.
Further, the branch is connected in parallel between the antenna body and the antenna circuit matched with the antenna body.
Further, the switch is grounded.
Furthermore, the multiple groups of radio frequency antennas are arranged on different surfaces of the same circuit board.
The beneficial effects of the utility model reside in that: the multiple groups of the set radio frequency antennas can work in a time-sharing mode, when the current working radio frequency antenna reads the electronic tag, the whole resonant frequency of other non-working radio frequency antennas except the current working radio frequency antenna is enabled to deviate to the whole resonant frequency far away from the current working radio frequency antenna through the control switch, and therefore the purpose of reducing mutual influence among the multiple antennas is achieved.
Drawings
Fig. 1 is a first schematic diagram of a set of rf antennas of the antenna of the electronic tag reader of the present invention.
Fig. 2 is a schematic diagram of a set of rf antennas of the antenna of the electronic tag reader of the present invention.
Fig. 3 is a schematic structural diagram of a group of rf antennas of an antenna of an electronic tag reader according to a first embodiment of the present invention.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
The utility model discloses the most crucial design lies in: the same circuit board is provided with a plurality of groups of radio frequency antennas, and the antenna circuit of each group of radio frequency antennas is provided with a branch with a switch to control the resonant frequency of the radio frequency antennas, so that the resonant frequencies of other radio frequency antennas deviate when one group of radio frequency antennas carries out radio frequency communication.
The utility model provides an electronic tags reader antenna, includes the circuit board and the multiunit is located radio frequency antenna on the circuit board, every group radio frequency antenna include the antenna body and with antenna circuit that the antenna body matches, antenna circuit is equipped with the branch road of taking the switch.
From the above description, the beneficial effects of the present invention are: the multiple groups of the set radio frequency antennas can work in a time-sharing mode, when the current working radio frequency antenna reads the electronic tag, the whole resonant frequency of other non-working radio frequency antennas except the current working radio frequency antenna is enabled to deviate to the whole resonant frequency far away from the current working radio frequency antenna through the control switch, and therefore the purpose of reducing mutual influence among the multiple antennas is achieved.
Specifically, a switch is added at any position of the existing antenna body and the antenna circuit matched with the antenna body, so that the integral resonant frequency can be changed, and the purpose of reducing mutual influence among multiple antennas is achieved.
As shown in fig. 1, R, L, C on the left side represents the equivalent impedance of the antenna circuit, Rant, Lant, Cant on the right side represent the equivalent impedance of the antenna body, SW1 represents a switch, and SW1 is connected in series between the antenna circuit and the antenna body. When the radio frequency antenna is required to be in a working state, the switch SW1 is switched on, the equivalent impedance of the antenna circuit is adjusted to enable the resonant frequency of the whole circuit to be a proper value, when the radio frequency antenna is required to be in a non-working state, the switch SW1 is switched off, the antenna circuit is disconnected with the antenna body, the resonant frequency of the radio frequency antenna in the non-working state is in a self-resonant frequency, the difference between the resonant frequency of the radio frequency antenna in the non-working state and the resonant frequency of the radio frequency antenna in the working state is large, and therefore the purpose of reducing the mutual influence among multiple antennas is achieved. The "self-resonant frequency" refers to a frequency at a point where the imaginary part is zero on the impedance-frequency curve of the antenna itself, and the resonant frequency of the antenna is at the self-resonant frequency when the switch SW1 is turned off in fig. 1.
Alternatively, as shown in fig. 2, R, L, C on the left side represents the equivalent impedance of the antenna circuit, Rant, Lant, Cant on the right side represents the equivalent impedance of the antenna body, SW1 represents a switch, and SW1 is connected in parallel between the antenna circuit and the antenna body. When the radio frequency antenna is required to be in a working state, the switch SW1 is switched off, the equivalent impedance of the antenna circuit is adjusted to enable the resonant frequency of the whole circuit to be a proper value, when the radio frequency antenna is required to be in a non-working state, the switch SW1 is switched on, the difference between the resonant frequency of the radio frequency antenna in the non-working state and the resonant frequency of the radio frequency antenna in the working state is large, and therefore the purpose of reducing mutual influence among multiple antennas is achieved.
Further, the switch is grounded.
As can be seen from the above description, the resonant frequency of the rf antenna can be shifted from the operating resonant frequency by providing a switch connected to ground.
Furthermore, the multiple groups of radio frequency antennas are arranged on different surfaces of the same circuit board.
According to the description, different groups of radio frequency antennas are arranged on different surfaces of the same circuit board, so that the circuit can be conveniently typeset, and meanwhile, due to the fact that the radio frequency antennas are arranged on different surfaces, antenna bodies of the radio frequency antennas can be arranged on different surfaces in a superposition mode, and the area of the circuit board is saved.
Referring to fig. 3, a first embodiment of the present invention is: an antenna of an electronic tag reader comprises a circuit board and a plurality of groups of radio frequency antennas arranged on the circuit board, wherein each group of radio frequency antennas comprises an antenna body and an antenna circuit matched with the antenna body. At least two groups of radio frequency antennas are arranged on two surfaces of the same circuit board, and antenna bodies of the radio frequency antennas are overlapped in vertical spaces of different surfaces of the circuit board. R, L, C on the left side of FIG. 3 represents the equivalent impedance of the antenna circuit, and Rant, Lant, Cant on the right side represent the equivalent impedance of the antenna body. The radio frequency antenna is provided with a branch with a switch, the branch comprises two switches SW1 and SW2 which are grounded, and the switch SW1 and the switch SW2 are connected between the antenna circuit and the antenna body in parallel.
In the embodiment, two grounded switches SW1 and SW2 are connected in parallel between the antenna circuit and the antenna body, when the radio frequency antenna is required to be in a working state, the switch SW1 and the switch SW2 can be simultaneously disconnected, and the resonant frequency of the whole circuit is enabled to be a proper value by adjusting the equivalent impedance of the antenna circuit; when the radio frequency antenna is required to be in a non-working state, the switches SW1 and SW2 are turned on simultaneously, and then the resonant frequency of the radio frequency antenna is changed greatly, so that the aim of reducing the mutual influence among multiple antennas is fulfilled.
The benefits of this embodiment are mainly two: firstly, the cost can be reduced, and the method can be realized by simply using an MOS tube as an electronic switch; and secondly, the reliability can be improved, when the MOS tube is used as an electronic switch, the on-off of the MOS tube is determined by the Vgs voltage, and compared with a single-switch circuit, the double-switch circuit has the advantages that one end of the double-switch circuit can be grounded, the Vgs voltage is ensured to be high or low, and the reliable switch is realized.
To sum up, the utility model provides an electronic tags reader antenna is provided with multiunit radio frequency antenna and can carries out timesharing work, when current work radio frequency antenna carries out electronic tags and reads, makes the whole resonant frequency of other non-work radio frequency antennas except that current work radio frequency antenna to the whole resonant frequency who keeps away from current work radio frequency antenna partially through control switch to reach the purpose that reduces influence of each other between the multiantenna.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (5)
1. The antenna of the electronic tag reader comprises a circuit board and is characterized by further comprising more than two groups of radio frequency antennas arranged on the circuit board, each group of radio frequency antennas comprises an antenna body and an antenna circuit matched with the antenna body, and the antenna circuit is provided with a branch with a switch.
2. An electronic tag reader antenna according to claim 1, characterized in that said branch is connected in series between said antenna body and the antenna circuit matched thereto.
3. An electronic tag reader antenna according to claim 1, characterized in that said branch is connected in parallel between said antenna body and the antenna circuit matched thereto.
4. The electronic tag reader antenna according to claim 1, wherein said switch is grounded.
5. The electronic tag reader antenna as claimed in claim 1, wherein two or more sets of the radio frequency antennas are provided on different surfaces of the circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920748215.XU CN210137007U (en) | 2019-05-23 | 2019-05-23 | Antenna of electronic tag reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920748215.XU CN210137007U (en) | 2019-05-23 | 2019-05-23 | Antenna of electronic tag reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210137007U true CN210137007U (en) | 2020-03-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920748215.XU Active CN210137007U (en) | 2019-05-23 | 2019-05-23 | Antenna of electronic tag reader |
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| Country | Link |
|---|---|
| CN (1) | CN210137007U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112066449A (en) * | 2020-09-15 | 2020-12-11 | 美的集团武汉制冷设备有限公司 | Air conditioner, control method, operation control device and computer storage medium |
-
2019
- 2019-05-23 CN CN201920748215.XU patent/CN210137007U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112066449A (en) * | 2020-09-15 | 2020-12-11 | 美的集团武汉制冷设备有限公司 | Air conditioner, control method, operation control device and computer storage medium |
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