CN100573165C - A kind of device that detects passive RFID electronic label resonance frequency - Google Patents
A kind of device that detects passive RFID electronic label resonance frequency Download PDFInfo
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- CN100573165C CN100573165C CNB2008100601243A CN200810060124A CN100573165C CN 100573165 C CN100573165 C CN 100573165C CN B2008100601243 A CNB2008100601243 A CN B2008100601243A CN 200810060124 A CN200810060124 A CN 200810060124A CN 100573165 C CN100573165 C CN 100573165C
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- passive rfid
- transformer
- electronic label
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Abstract
The present invention relates to a kind of coupling mechanism that is used for detecting passive RFID intelligent electronic label resonance frequency.Passive RFID intelligent electronic label resonance frequency does not have suitable instrument that it is accurately detected at present, comes it is carried out frequency matching accurately to such an extent as to can not find suitable standard in passive RFID smart electronics production run.The present invention includes cylinder, twine two groups of enamel-cover leads on the cylinder, the right cylinder shelves have been placed at the center of cylinder, the most significant end of shelves is in the center of two groups of enamel-cover leads, supporting lug is installed on the cylinder, transformer core, two coils of transformer, tuning capacity, BNC connector are installed on the supporting lug.The resonance frequency that the present invention is simple in structure, be easy to make, can accurately detect the passive RFID intelligent electronic label is for the production of passive RFID intelligent electronic label provides reliable data.
Description
Technical field
The invention belongs to electronic technology field, be specifically related to a kind of device that detects passive RFID (Radio-frequency identification, radio frequency identification) electronic label resonance frequency that is applicable to.
Background technology
The range of application of passive RFID system is very extensive, expands rapidly to every field.Its main one-tenth part is reader and electronic tag.
Reader sends alternating electromagnetic field towards periphery in certain frequency range.A LC oscillation circuit is arranged in the electronic tag.According to Thomson formula
The resonance frequency of LC oscillation circuit is determined by the value of telefault L and the tuning capacitor C that is complementary.
When electronic tag enters in the alternating magnetic field that reader sends, if the resonance frequency in electronic tag LC loop equates with the transmission frequency of reader, LC oscillation circuit generation resonance then.Resonance signal makes the reader antenna coil produce very large induction current, produces enough big magnetic field intensity thus and makes the very strong induced voltage of generation on the electronic tag LC oscillation circuit, starts the microchip in the electronic tag, makes it and the reader swap data.
Therefore, the necessary condition of the effective work of passive RFID electronic label is: the alternating magnetic field frequency that reader sends is identical with the resonance frequency in electronic tag LC loop.But, passive RFID electronic label is a LC oscillation circuit, even by encapsulation such as paper, plastic housing or glass get up to be difficult to the contact, be difficult in the experiment to measure electronic tag resonance frequency and with the deviation of reader transmission frequency, moreover in the telefault of LC oscillation circuit, exist the distributed capacitance value that can't detect.Therefore, frequency values that must repeated measurement LC oscillation circuit is revised the tuning capacity value of being mated, so that the resonance frequency of electronic tag meets the demands.
At present also do not have suitable instrument to come the frequency of passive RFID electronic label is detected accurately, make passive RFID electronic label not have the standard of suitable matching frequency in process of production.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, provide a kind of simple in structure, be easy to make, have the device that can detect passive RFID electronic label resonance frequency rapidly and accurately.
The present invention includes base, cylinder is fixedly connected on the base, is provided with cylindrical shelves along shaft core position in the cylinder, and shelves are fixedlyed connected with base, and the wall thickness of described cylinder is 1～5mm.The cylinder lateral wall is set with supporting lug, and two BNC connectors, transformer and two tuning capacities are arranged on the supporting lug.Two enamel-cover leads are wrapped in the lateral wall of cylinder respectively, and every enamel-cover lead twines two circle back joint butt joints along the cylinder circumference.The distance that is wrapped between two enamel-cover leads on the cylinder is identical with the radius of cylinder, and the end face of shelves is concordant with the centre position of two enamel-cover leads.Two tuning capacities are connected with the coils from parallel connection of coils on transformer both sides respectively, and two BNC connectors are connected with the two ends of transformer coil on one side respectively, and the joint of two enamel-cover leads is connected with the two ends of the coil of transformer another side respectively.
Concrete job operation is: wall thickness is about 1～5mm elastoplast plate or cardboard is bent into a cylinder, the diameter of cylinder must be greater than more than 2 times of electronic tag maximum length to be measured, cylinder is bonded on the base, two enamel-cover leads are wrapped on the cylinder, every enamel-cover lead is wound in two circles, the distance of two enamel-cover leads is the section radius of cylinder, be connected on coil of transformer after two enamel-cover leads and a tuning capacity parallel connection, another coil of transformer is connected on the BNC connector by another tuning capacity, transformer, electric capacity, BNC connector is fixed on the supporting lug, supporting lug is fixed on the right cylinder cylindrical shell, right cylinder is placed cylinder shelves, and the highest point of shelves is in the center of two enamel-cover leads.
The present invention is simple in structure, easy to make, simple and efficient to handle, can detect the frequency of passive RFID electronic label rapidly, for the production of passive RFID electronic label provides reliable instrument.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is a principle of work synoptic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing specific implementation of the present invention is described further.
As shown in Figure 1, 2, a kind of device that detects passive RFID electronic label resonance frequency that is applicable to, comprise cylinder 1, cylinder 1 is bonded on the base 5, be wound with two enamel-cover lead 2-1 and 2-2 on the cylinder 1, cylinder 1 is provided with supporting lug 3, and two BNC connector 6-1 and 6-2, transformer core 7, two transformer coil 8-1 and 8-2 and two tuning capacity 9-1 and 9-2 are installed on the supporting lug 3, is placed with right cylinder shelves 4 in the middle of the cylinder 1.
Cylinder 1 wall thickness is 1～5mm, and material is elastoplast plate or cardboard.The diameter of cylinder 1 must be greater than more than 2 times of electronic tag maximum length to be measured.
Enamel-cover lead 2-1,2-1 closely are wound in two circles respectively on the outer wall of cylinder 1, distance between two equals the radius of cylinder 1, thereby constitute a Helmholtz coils structure, this structure heart zone therein can obtain a uniform magnetic field space.Two joints of enamel-cover lead 2-1 are connected to two joints of enamel-cover lead 2-2, constitute joint 103 and 104.
Above each several part and base 5 are all fixed with insulating gel.
Be illustrated in figure 3 as device principle of work synoptic diagram.Constitute by Helmholtz coils circuit theory diagrams II, built-in transformer circuit schematic diagram III and external three parts such as spectrum analyzer synoptic diagram IV.Wherein: Helmholtz coils circuit theory diagrams II and built-in transformer circuit schematic diagram III have constituted device circuit schematic diagram I.
According to device principle of work synoptic diagram as shown in Figure 3, the spectrum analyzer that mates with device has two external interfaces 105 and 106.Interface 105 is signal source output ports of spectrum analyzer, be connected with the joint 101 of device by BNC connector 6-1, for device provides exchange current, the transformer coil 8-2 of AC signal in installing and the LC oscillation circuit of tuning capacity 9-2, distributed capacitance 10-2 formation from spectrum analyzer have produced alternating magnetic field.The LC oscillation circuit that transformer coil 8-1 and tuning capacity 9-1, distributed capacitance 10-1 constitute is subjected to the effect of alternating magnetic field to produce induction current, and induction current produces the identical alternating magnetic field of frequency by enamel-cover lead 2-1,2-2.According to the Helmholtz coils principle of work, this alternating magnetic field produces uniform magnetic field in the central area of the cylinder 1 of device.When electronic tag entered in this uniform magnetic field, the LC oscillation circuit of electronic tag produced vibration.When the change frequency of uniform magnetic field equates with the LC loop resonance frequency of electronic tag, promptly produce resonance.Resonance makes and has produced a very strong induced voltage signal in the circuit coil.The pairing sweep frequency of peak value of shown induced voltage curve is the resonance frequency of the electronic tag of surveying on the spectrum analyzer.
Claims (1)
1. device that detects passive RFID electronic label resonance frequency, comprise base, it is characterized in that cylinder is fixedly connected on the base, be provided with cylindrical shelves along shaft core position in the cylinder, shelves are fixedlyed connected with base, the wall thickness of described cylinder is 1～5mm, and the diameter of cylinder is greater than 2 times of electronic tag maximum length to be measured; The cylinder lateral wall is set with supporting lug, and two BNC connectors, transformer and two tuning capacities are arranged on the supporting lug; Two enamel-cover leads are wrapped in the lateral wall of cylinder respectively, every enamel-cover lead twines two circle back joint butt joints along the cylinder circumference, the distance that is wrapped between two enamel-cover leads on the cylinder is identical with the radius of cylinder, and the end face of shelves is concordant with the centre position of two enamel-cover leads; Two tuning capacities are connected with the coils from parallel connection of coils on transformer both sides respectively, and two BNC connectors are connected with the two ends of transformer coil on one side respectively, and the joint of two enamel-cover leads is connected with the two ends of the coil of transformer another side respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100601243A CN100573165C (en) | 2008-03-11 | 2008-03-11 | A kind of device that detects passive RFID electronic label resonance frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100601243A CN100573165C (en) | 2008-03-11 | 2008-03-11 | A kind of device that detects passive RFID electronic label resonance frequency |
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| Publication Number | Publication Date |
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| CN101241152A CN101241152A (en) | 2008-08-13 |
| CN100573165C true CN100573165C (en) | 2009-12-23 |
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| CNB2008100601243A Expired - Fee Related CN100573165C (en) | 2008-03-11 | 2008-03-11 | A kind of device that detects passive RFID electronic label resonance frequency |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104268612B (en) * | 2014-09-25 | 2017-07-14 | 何德驹 | A kind of method and apparatus of fixed smart card frequency |
| CN105866541A (en) * | 2016-06-13 | 2016-08-17 | 公安部第研究所 | Resonance frequency metering method of energy testing simulation card |
| CN106125025A (en) * | 2016-06-13 | 2016-11-16 | 公安部第研究所 | Energy test analog card resonant frequency calibrating installation |
| CN109374967B (en) * | 2018-11-06 | 2020-05-19 | 华中科技大学 | Detection method and system for resonant frequency of low-Q-value SAW (surface Acoustic wave) magnetoelectric sensor |
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2008
- 2008-03-11 CN CNB2008100601243A patent/CN100573165C/en not_active Expired - Fee Related
Non-Patent Citations (4)
| Title |
|---|
| 基于Lab VIEW的电子防盗标签分拣系统设计. 李?.自动化技术与应用，第24卷第8期. 2005 * |
| 基于LabVIEW的电子防盗标签分拣系统设计. 李?.自动化技术与应用，第24卷第8期. 2005 |
| 基于嵌入式技术的电子标签质量检测系统. 孙正捷等.杭州电子科技大学学报，第27卷第1期. 2007 |
| 基于嵌入式技术的电子标签质量检测系统. 孙正捷等.杭州电子科技大学学报，第27卷第1期. 2007 * |
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| CN101241152A (en) | 2008-08-13 |
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Granted publication date: 20091223 Termination date: 20130311 |