CN108399347A - The method for controlling the tag recognition range of hyperfrequency near field RFID systems - Google Patents
The method for controlling the tag recognition range of hyperfrequency near field RFID systems Download PDFInfo
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- CN108399347A CN108399347A CN201810225468.9A CN201810225468A CN108399347A CN 108399347 A CN108399347 A CN 108399347A CN 201810225468 A CN201810225468 A CN 201810225468A CN 108399347 A CN108399347 A CN 108399347A
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- 239000004020 conductor Substances 0.000 claims abstract description 140
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- 238000005859 coupling reaction Methods 0.000 claims description 4
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/06—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/20—Two collinear substantially straight active elements; Substantially straight single active elements
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Abstract
The present invention relates to a kind of methods of the tag recognition range of control hyperfrequency near field RFID systems.The method of the tag recognition range of the control hyperfrequency near field RFID systems, includes the following steps：Ultrahigh frequency RFID reader is connected as feed using the combination of non-near field antenna or non-near field antenna；It is basic structural unit with half-wave long conductor, the infrastructure element is excited using the feed, to form effective identification range of ultrahigh frequency RFID system around the half-wave long conductor, effective identification range hyperfrequency near field RFID label for identification.The identification range of electronic tag can be more accurately controlled using the method for the tag recognition range of the control hyperfrequency near field RFID systems.
Description
Technical field
The present invention relates to a kind of methods of the tag recognition range of control hyperfrequency near field RFID systems.
Background technology
The development of Internet of Things is maked rapid progress, and the ultrahigh frequency RFID (Radio of foundation stone is interconnected as Internet of Things all things on earth
Frequency Identification, radio frequency identification) technology is from big packaging electronic tag, the pallet electronic tag of article
It is strided forward towards single grade electronic tag.However, in actual use, ultrahigh frequency RFID list product label either skip or is misread,
It is always difficult to obtain satisfactory discrimination.This is because radiation theory of the ultrahigh frequency RFID technology based on electromagnetic field causes
's.Reflection and refraction and liquid and metal can be repeated to label antenna matching performance to electromagnetic field in ambient enviroment
It influences, gets up to cause inside and outside entire recognition region additionally, due to combined factors such as the decline rules of electromagnetic field radiation far field midfield
The randomness of electromagnetic field intensity area and blind area, uncertainty and easy perturbation so as to cause skip and misread problem.
Invention content
Based on this, it is necessary to provide a kind of control hyperfrequency for the identification range that can be more accurately controlled electronic tag
The method of the tag recognition range of near field RFID systems.
A method of the tag recognition range of control hyperfrequency near field RFID systems includes the following steps：
Ultrahigh frequency RFID reader is connected as feed using the combination of non-near field antenna or non-near field antenna；
It is basic structural unit with half-wave long conductor, the infrastructure element is excited using the feed, in described
Effective identification range of ultrahigh frequency RFID system, effective identification range superelevation for identification are formed around half-wave long conductor
Frequency near field RFID label.
It is described to excite the infrastructure element using the feed in a wherein embodiment, in described half
The step of effective identification range of formation ultrahigh frequency RFID system, includes around wave conductors：The neighbouring non-near field antenna is set
The half-wave long conductor is set, so that the linear polarization direction of the non-near field antenna and the length direction of the half-wave long conductor are flat
Row, to form effective identification range around the half-wave long conductor.
In a wherein embodiment, the step of half-wave long conductor is arranged in the neighbouring non-near field antenna it
It is preceding further comprising the steps of：According to the determination of the result of analogue simulation half-wave long conductor and the half-wave long conductor is provided, so that
The equivalent electrical length of the half-wave length conductor is equal with half-wavelength.
In a wherein embodiment, the result according to analogue simulation half-wave long conductor is determining and provides described half
The step of wave conductors includes：Equal proportion expands or reduces the half-wave long conductor and detect the half-wave long conductor simultaneously
Induced electricity flow valuve；And determine the maximum value of the induced electricity flow valuve, and obtain corresponding half-wavelength conductor size.
In a wherein embodiment, the equal proportion expands or includes the step of reducing the half-wave long conductor：
Splice multiple half-wavelength conductor elements to form the half-wave long conductor, equal proportion, which expands or reduces the multiple half-wavelength, to be led
The size of body unit, so that the half-wavelength conductor element in center has the maximum value of induced electricity flow valuve so that each
The actual size of half-wavelength conductor element changes, and by the mutual coupling between each half-wavelength conductor element, it is described
The equivalent electrical length of half-wave long conductor is still half-wavelength.
In a wherein embodiment, the half-wave long conductor is half-wavelength straight conductor, the half-wavelength straight conductor
Length direction is parallel with the linear polarization direction of non-near field antenna.
In a wherein embodiment, the half-wave long conductor includes half-wavelength snake conductor.
In a wherein embodiment, the half-wavelength snake conductor constitutes square area, and the half-wavelength is led
The length direction of body is the diagonal of the square area.
In a wherein embodiment, the half-wave long conductor by multiple half-wavelength snake conductors splicings and
At.
In a wherein embodiment, the half-wave long conductor is that multiple half-wavelength snake conductors are spliced
Square conductor, the length direction of the multiple half-wavelength snake conductor is parallel to each other, and each half-wavelength is wriggled
Line conductor is rotated by 90 ° the equal mirror symmetry of either one or two of rear and adjacent half-wavelength snake conductor and is arranged.
The present invention directly uses non-near field antenna as feed, since account for absolutely leading position in space is that electromagnetism is remote
, so other than several millimeters of the very small region near non-near field antenna, other positions equal None- identified hyperfrequency near field
RFID tag, then, the present invention build effective identification range of required ultrahigh frequency RFID system with half-wave long conductor, from
And reaches and accurately control near field tag identification range, avoids blind area and label skip in identification range and break through near field day
The purpose of the read range limitation of line.
Description of the drawings
Figure 1A and Figure 1B is the floor map of common near field electronic tag.
Fig. 2 is the curve graph of the electric current and wavelength in half-wavelength straight line conductor.
Fig. 3 A are the floor map of the dipole antenna of an embodiment.
Fig. 3 B to Fig. 3 D show effective identification range of three kinds of half-wave long conductors respectively.
Fig. 4 is the floor map of the combined semi wave conductors of an embodiment.
Fig. 5 is the result schematic diagram of the Electromagnetic Simulation of effective identification range of an embodiment.
Specific implementation mode
To facilitate the understanding of the present invention, below with reference to relevant drawings to invention is more fully described.In attached drawing
Give the better embodiment of the present invention.But the present invention can realize in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more the disclosure
Add thorough and comprehensive.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not offered as being unique embodiment.
Unless otherwise defined, all of technologies and scientific terms used here by the article and belong to the technical field of the present invention
The normally understood meaning of technical staff is identical.Term used herein is intended merely to the mesh of description specific embodiment
, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more relevant Listed Items
Any and all combinations.
A and Figure 1B is please referred to Fig.1, a kind of RFID tag needs to assist using the reader near field antenna specially designed
Identification.The General Principle of reader near field antenna is the phase by changing multiple current emissions units, enables reading and writing device antenna all
There is more equally distributed magnetic field in a certain range enclosed, achievees the purpose that coupled to each other near field electronic tag.State near field
Electronic tag seems to be exactly a small ring.Therefore near field electronic tag is had an effect by magnetic coupling and reading and writing device antenna
's.However, this method still has limitation, it is mainly manifested in：1) area of reliable read range is smaller, substantially diameter
Half-wave grows to the border circular areas of 0.75 wavelength；2) it other than reliable read range, still there may be the strong area in magnetic field, causes close
Field electronic tag is misread；3) cost of implementation is higher.
The present invention provides a kind of methods accurately controlling ultra-high frequency RFID technology identification range.This method requires first
Using hyperfrequency near field RFID label as the electronic tag of management article.
According to basic Antenna Design theory, it is known that the dipole antenna of half wavelengths long has best radiation special
Property, the current amplitude of center is maximum, as shown in Figure 2.According to antenna reciprocity theorem, a half-wavelength straight line conductor,
There should be maximum center electric current under the antenna excitation of same polarization direction, and conductor both ends electric current is approximately
Zero, current direction is consistent on whole section of conductor.The magnetic field near field characteristic point can be formed near half-wave long conductor like this
Cloth.And in the magnetic field near the stronger position of central current, it is sufficient to activate ultrahigh frequency RFID near field tag, and provide enough
The energy of label transmission data.Above-mentioned conclusion can be generalized to the conductor structure that arbitrary equivalent electric size is half-wavelength.
Fig. 3 A to Fig. 3 D are please referred to, in one embodiment, a kind of tag recognition model of control hyperfrequency near field RFID systems
The method enclosed, includes the following steps：Made using the combination connection ultrahigh frequency RFID reader of non-near field antenna or non-near field antenna
For feed；It is basic structural unit with half-wave long conductor, the infrastructure element is excited using the feed, in described half
Effective identification range of ultrahigh frequency RFID system, effective identification range hyperfrequency for identification are formed around wave conductors
Near field RFID label.
The present invention directly uses non-near field antenna as feed, since account for absolutely leading position in space is that electromagnetism is remote
, so other than several millimeters of the very small region near non-near field antenna, other positions equal None- identified hyperfrequency near field
RFID tag, then, the present invention build effective identification range of required ultrahigh frequency RFID system with half-wave long conductor, from
And reaches and accurately control near field tag identification range, avoids blind area and label skip in identification range and break through near field day
The purpose of the read range limitation of line.For example, the non-near field antenna is dipole antenna.For example, the half-wave long conductor
Equivalent electrical length it is equal with half-wavelength, and the length side in the linear polarization direction of the dipole antenna and the half-wave long conductor
To being arranged in parallel.
In above-mentioned half-wave long conductor, since the equivalent electrical length of the half-wave long conductor is equal with half-wavelength and described
The linear polarization direction of dipole antenna and the length direction of the half-wave long conductor are arranged in parallel so that the center of half-wave long conductor
The induced current amplitude at place is maximum, and field behavior caused by the electric field of the half-wave long conductor goes out the strong of apparent non-blind area
Magnetic near field characteristic.
Fig. 3 A to Fig. 3 D show under the excitation of dipole antenna how different half-wavelength conductor structures shows not
Same near field tag identification range.The dash area that dotted line surrounds is exactly that single half-wavelength conductor structure is formed by effective identification
Range.Can therefrom it find out, it is the conductor that part area defined of the half-wave long conductor close to center, which can be approximately considered,
It is constructed go out effective identification range.
For example, the method for the tag recognition range for the ease of manufacturing the control hyperfrequency near field RFID systems, described
Non- near field antenna is half wavelength dipoles sub-antenna.The half-wave long conductor is half-wavelength straight conductor, the half-wavelength straight conductor
Length direction is parallel with the linear polarization direction of non-near field antenna.By being half wavelength dipole day by the non-near field antenna
Line makes the method for the tag recognition range of the control hyperfrequency near field RFID systems that common half wavelength dipoles may be used
Sub-antenna or antenna combination are as feed, to reduce its cost, convenient for manufacture.
For example, referring to Fig. 4, for the ease of forming preset effective identification range, the half-wave long conductor includes half-wave
Long snake conductor.The half-wavelength snake conductor constitutes square area, and the length direction of the half-wave long conductor is institute
State the diagonal of square area.The half-wave long conductor is spliced by multiple half-wavelength snake conductors.Institute
It is the square conductor that multiple half-wavelength snake conductors are spliced to state half-wave long conductor.The multiple half-wavelength is wriggled
The length direction of line conductor is parallel to each other, and each half-wavelength snake conductor is rotated by 90 ° rear any one institute with adjoining
State the equal mirror symmetry setting of half-wavelength snake conductor.The length of side of the square conductor is 82 millimeters.Pass through multiple half-wavelengths
The combination of snake conductor, so that effective identification range of the half-wave long conductor forms rectangle.For example, effective knowledge
Not ranging from rectangular area.Diversified effective identification range can be formed by the permutation and combination of half-wavelength conductor structure.
The effective identification range for collectively forming approximating square that Fig. 4 passes through 4 half-wavelength conductor elements.
For example, described excite the infrastructure element using the feed, in surrounding's shape of the half-wave long conductor
At ultrahigh frequency RFID system effective identification range the step of include：The neighbouring non-near field antenna is arranged the half-wavelength and leads
Body, so that the linear polarization direction of the non-near field antenna is parallel with the length direction of half-wave long conductor, in described half
Effective identification range is formed around wave conductors.For example, the neighbouring non-near field antenna is arranged the half-wavelength and leads
It is further comprising the steps of before the step of body：It is determining according to the result of analogue simulation half-wave long conductor and the half-wavelength is provided leads
Body, so that the equivalent electrical length of the half-wave length conductor is equal with half-wavelength.For example, described according to analogue simulation half-wavelength
The result of conductor is determining and includes the step of providing the half-wave long conductor：Equal proportion expands or reduces the half-wave long conductor
And the induced electricity flow valuve of the half-wave long conductor is detected simultaneously；And determine the maximum value of the induced electricity flow valuve, and acquisition pair
The half-wavelength conductor size answered.For example, the equal proportion expands or includes the step of reducing the half-wave long conductor：It is described etc.
Ratio expands or includes the step of reducing the half-wave long conductor：Splice multiple half-wavelength conductor elements to form the half-wave
Long conductor, equal proportion expand or reduce the size of the multiple half-wavelength conductor element, so that the half-wave in center
Long conductor unit has the maximum value of induced electricity flow valuve so that and the actual size of each half-wavelength conductor element changes, and
By the mutual coupling between each half-wavelength conductor element, the equivalent electrical length of the half-wave long conductor is still half-wavelength.
Referring to Fig. 5, in one embodiment, using standard dipole antenna as feed, the input power of antenna is 2
Watt, this configuration mode meets the specification limit that country uses about RFID.Hyperfrequency near field tag selects Impinj companies (English
Pin Jie companies) J41 type near field tags, be identified need magnetic field intensity be about -23dB A/m (decibel * peaces/rice).I
Constitute 104 centimeter lengths, 29 centimetres wide of neat rectangular near field mark using 157 half-wavelength snake conductor elements
It is signed with effect identification range.Fig. 5 is Electromagnetic Simulation as a result, being depicted in figure under dipole antenna excitation, and 157 half-wavelengths are wriggled
Distribution of Magnetic Field around the plane of line conductor element composition at 2 millimeters.The rectangle black region at middle part is indicated perpendicular to flat in figure
The magnetic field intensity in face has reached the requirement of effective identification near field tag.It can be seen that the entire effective identification range boundary of near field tag
Clear, there is no apparent identification blind areas in range, and 104 centimetres of length is about 3 wavelength, greatly breach current near field day
The identification range of line limits.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Only several embodiments of the present invention are expressed for embodiment described above, the description thereof is more specific and detailed, but
It cannot be construed as a limitation to the scope of the present invention.It should be pointed out that for the ordinary skill people of this field
For member, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the present invention's
Protection domain.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of method of the tag recognition range of control hyperfrequency near field RFID systems, which is characterized in that include the following steps：
Ultrahigh frequency RFID reader is connected as feed using the combination of non-near field antenna or non-near field antenna；
It is basic structural unit with half-wave long conductor, the infrastructure element is excited using the feed, in the half-wave
Effective identification range of ultrahigh frequency RFID system is formed around long conductor, hyperfrequency is close for identification for effective identification range
Field RFID tag.
2. the method for the tag recognition range of control hyperfrequency near field RFID systems as described in claim 1, which is characterized in that
It is described to excite the infrastructure element using the feed, to form ultrahigh frequency RFID system around the half-wave long conductor
System effective identification range the step of include：The half-wave long conductor is arranged in the neighbouring non-near field antenna, so that described non-near
The linear polarization direction of field antenna is parallel with the length direction of half-wave long conductor, to be formed around the half-wave long conductor
Effective identification range.
3. the method for the tag recognition range of control hyperfrequency near field RFID systems as claimed in claim 2, which is characterized in that
It is further comprising the steps of before the step of half-wave long conductor is arranged in the neighbouring non-near field antenna：According to analogue simulation
The result of half-wave long conductor is determining simultaneously to provide the half-wave long conductor so that the equivalent electrical length of the half-wave length conductor with
Half-wavelength is equal.
4. the method for the tag recognition range of control hyperfrequency near field RFID systems as claimed in claim 3, which is characterized in that
The result according to analogue simulation half-wave long conductor is determining and includes the step of providing the half-wave long conductor：Equal proportion expands
Or it reduces the half-wave long conductor and detects the induced electricity flow valuve of the half-wave long conductor simultaneously；And determine the induced electricity
The maximum value of flow valuve, and obtain corresponding half-wavelength conductor size.
5. the method for the tag recognition range of control hyperfrequency near field RFID systems as claimed in claim 4, which is characterized in that
The equal proportion expands or includes the step of reducing the half-wave long conductor：Splice multiple half-wavelength conductor elements to be formed
Half-wave long conductor is stated, equal proportion expands or reduce the size of the multiple half-wavelength conductor element, so as to be in center
Half-wavelength conductor element there is the maximum value of induced electricity flow valuve so that the actual size of each half-wavelength conductor element becomes
Change, and by the mutual coupling between each half-wavelength conductor element, the equivalent electrical length of the half-wave long conductor is still half-wave
It is long.
6. the method for the tag recognition range of control hyperfrequency near field RFID systems as described in claim 1, which is characterized in that
The half-wave long conductor is half-wavelength straight conductor, the line pole of the length direction of the half-wavelength straight conductor and the non-near field antenna
It is parallel to change direction.
7. the method for the tag recognition range of control hyperfrequency near field RFID systems as described in claim 1, which is characterized in that
The half-wave long conductor includes half-wavelength snake conductor.
8. the method for the tag recognition range of control hyperfrequency near field RFID systems as claimed in claim 7, which is characterized in that
The half-wavelength snake conductor constitutes square area, and the length direction of the half-wave long conductor is the square area
Diagonal.
9. the method for the tag recognition range of control hyperfrequency near field RFID systems as claimed in claim 7, which is characterized in that
The half-wave long conductor is spliced by multiple half-wavelength snake conductors.
10. the method for the tag recognition range of control hyperfrequency near field RFID systems, feature exist as claimed in claim 7
In the half-wave long conductor is the square conductor that multiple half-wavelength snake conductors are spliced, the multiple half-wave
The length direction of long snake conductor is parallel to each other, and each half-wavelength snake conductor is rotated by 90 ° rear times with adjoining
One equal mirror symmetry setting of half-wavelength snake conductor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810225468.9A CN108399347B (en) | 2018-03-19 | 2018-03-19 | Method for controlling tag identification range of ultrahigh frequency near field RFID system |
| PCT/CN2018/101577 WO2019179017A1 (en) | 2018-03-19 | 2018-08-21 | Method for controlling tag identification range of ultra-high frequency near-field rfid system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810225468.9A CN108399347B (en) | 2018-03-19 | 2018-03-19 | Method for controlling tag identification range of ultrahigh frequency near field RFID system |
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| Publication Number | Publication Date |
|---|---|
| CN108399347A true CN108399347A (en) | 2018-08-14 |
| CN108399347B CN108399347B (en) | 2024-03-12 |
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| CN201810225468.9A Active CN108399347B (en) | 2018-03-19 | 2018-03-19 | Method for controlling tag identification range of ultrahigh frequency near field RFID system |
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| WO (1) | WO2019179017A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019179017A1 (en) * | 2018-03-19 | 2019-09-26 | 南京思追特电子科技有限公司 | Method for controlling tag identification range of ultra-high frequency near-field rfid system |
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| CN108399347B (en) * | 2018-03-19 | 2024-03-12 | 南京思追特电子科技有限公司 | Method for controlling tag identification range of ultrahigh frequency near field RFID system |
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- 2018-08-21 WO PCT/CN2018/101577 patent/WO2019179017A1/en active Application Filing
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| CN208225058U (en) * | 2018-03-19 | 2018-12-11 | 南京思追特电子科技有限公司 | Control the structure of the tag recognition range of hyperfrequency near field RFID systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019179017A1 (en) * | 2018-03-19 | 2019-09-26 | 南京思追特电子科技有限公司 | Method for controlling tag identification range of ultra-high frequency near-field rfid system |
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| WO2019179017A1 (en) | 2019-09-26 |
| CN108399347B (en) | 2024-03-12 |
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