CN107799873A - Near-field readers antenna and antenna array for unmanned cash register platform - Google Patents
Near-field readers antenna and antenna array for unmanned cash register platform Download PDFInfo
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- CN107799873A CN107799873A CN201711010578.5A CN201711010578A CN107799873A CN 107799873 A CN107799873 A CN 107799873A CN 201711010578 A CN201711010578 A CN 201711010578A CN 107799873 A CN107799873 A CN 107799873A
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Classifications
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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
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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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
- H01Q1/2225—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 active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses a kind of near-field readers antenna and antenna array for unmanned cash register platform.Its aerial radiation structure includes antenna micro strip radiation minor matters, phase shift minor matters；Antenna micro strip radiation minor matters include antenna micro strip line and the horizontally arranged antenna micro strip line that vertical direction is set, form serpentine configuration, the horizontal and vertical length of regulation microstrip line makes current direction on partial vertical direction identical, identical with current direction in local horizontal direction；Phase shift minor matters are inserted in the part of the identical flow direction of antenna micro strip line, make the spatial altitude of same direction current identical, and realize the more polarised directions of near-field region electric field, avoid near field tag from misreading.The present invention can avoid misreading far-field tags, while also reduce interference of the other systems to unmanned RFID system；With the label antenna of read line ring type, the label antenna of class dipole can also be read, and antenna has more flexibility.
Description
Technical field
The present invention relates to a kind of RFID (Radio Frequency Identification, radio frequency identification) systems technology
Field, more particularly to a kind of RFID near field reader antenna and antenna array for unmanned cash register platform.
Background technology
Radio frequency identification (Radio Frequency Identification, abbreviation RFID) technology is led to using radiofrequency signal
Cross backscattering or electromagnetic field couples realize automatic identification and the technology of wireless data transmission.Reader antenna is in RFID system
Indispensable part, the performance quality of antenna directly influence the performance of whole system.RFID technique is Internet of Things
In indispensable important component, be widely used in library, gate control system, each fields such as food security is traced to the source.More enter
One step, the mobile terminal such as RFID system and mobile phone integrates, it is possible to achieve mobile payment, article anti-counterfeit and tracking etc. are mobile mutual
Working application, there is higher commercial value.For RFID technique in the application of unmanned retail trade, such as unmanned cash register is RFID
The embodiment that system merges with mobile terminals such as mobile phones.
Unmanned cash register mainly uses near field RFID systems, at present, most unmanned POS using
13.56MHz High frequency RFID systems, using the near field RFID system of magnetic coupling, have in closely identification preferably stable
Performance, but the cost of the coil label of magnetic coupling is higher, is not suitable for the retail trade of low profit.And UHF (Ultra High
Frequency, 300-3000MHz hyperfrequency) frequency range RFID system label cost higher-frequency label cost it is lower, be more suitable for
Applied to retail trade.
For uhf band near field RFID systems, the near field of magnetic coupling is read apart from too short, and the near field of field coupling is read
Take distant, so for the near field RFID systems of uhf band, be more suitable for the near field leaky wave using field coupling
RFID antenna.
On unmanned cash register platform, it is desirable to must be able to read all object labels of near field region, and exclude far-field region
In non-targeted thing label interference, avoid label from misreading.Therefore, the design of near field read-write device antenna be realize unmanned supermarket with
And unmanned cash register platform the key link.On the other hand, because businessman is cost-effective, the label being attached on object generally is
For the antenna of single polarization, it is necessary to detect the label on the article at place, the polarised direction of label antenna needs the pole with reader antenna
Change matching.When buying commodity payment for client, the putting position of article is unfixed on payment platform, and label antenna becomes
To in different directions.If reader antenna is single polarised direction, then skip will occur for label.Therefore design near field day
Line must have electric field multipolarization.Secondly near field disclosure satisfy that uniform stronger Electric Field Distribution, and near field antenna have one
Important factor.
It is traditional based on the uhf band RFID reader antenna of Far Field Scattering principle far from meeting that open space cash register puts down
The design requirement of platform RFID card reader antenna, it is necessary to based near field operation principle, realize and necessarily ensureing label in reading section
Accurate reading near field RFID antenna.
The content of the invention
1st, goal of the invention.
In order to solve the problems, such as that the near field of magnetic coupling in the prior art is read apart from too short and propose and a kind of be used for nothing
The near-field readers antenna and antenna array of people's cash register platform, improve identification distance and accuracy, exclusive PCR, the reduction near field
Cost.
2nd, the technical solution adopted in the present invention.
For the near field RFID reader antenna of unmanned cash register platform, applied in 860MHz~960MHz frequency ranges, have
Stronger near field electric field and relatively low far gain.
A kind of near-field readers antenna for unmanned cash register platform proposed by the present invention, its aerial radiation structure include day
Line micro-strip radiation minor matters, phase shift minor matters；Antenna micro strip radiation minor matters include antenna micro strip line and the level side that vertical direction is set
To the antenna micro strip line of setting, serpentine configuration is formed, the horizontal and vertical length of regulation microstrip line makes electric on partial vertical direction
Stream flow to it is identical, it is identical with current direction in local horizontal direction；Phase shift branch is inserted in the part of the identical flow direction of antenna micro strip line
Section, makes the spatial altitude of same direction current identical.
In further embodiment, the turning of described serpentine configuration is the snakelike knot of micro-strip of circular arc or right angle
Structure.
In further embodiment, the aerial radiation structure is micro- by two sections of phase shift minor matters structures and four sections of antennas
Band line serpentine configuration composition；Two sections of micro-strip serpentine configurations use monosymmetric shape in four sections of antenna micro strips line serpentine configuration
Formula, current direction is identical in vertical direction；Two other microstrip line serpentine configuration uses approximate both sides mirror image forms, electric current side
It is identical to flowing in the horizontal direction, and the path length of four sections of microstrip lines is identical, and four sections of snakelike microstrip structure ends are adopted
With open-circuit condition, two sections of phase-shift structures are located in the micro-line of the symmetrical micro-strip in both sides and in the micro-line of both sides mirror type micro-strip respectively,
Realize that the spatial altitude in same current direction is identical, and realize the more polarised directions of near-field region electric field, avoid near field tag
Misread.
In further embodiment, two sections of phase shift minor matters structure uses U-shape structure, the U-shaped shifting of first paragraph
In phase structure, two side arms are longer, and the two side arms in second segment U-shape structure are shorter, strengthen antenna micro strip line same direction current, make near field
Electric field produces more polarised directions.
In further embodiment, described U-shaped phase shift minor matters structure is perpendicular shape or flat shape.
In further embodiment, in addition to sub-miniature A connector, feed port, antenna match minor matters, power distribution branch
Section；Antenna feed port is directly connected using a sub-miniature A connector with feed port one end, and the other end is connected with antenna match minor matters；
Antenna match minor matters are connected with the power divider of antenna, and antenna power distributor is connected with antenna micro strip radiation minor matters.
In further embodiment, described feed port is 50 ohm microstrips.
In further embodiment, described antenna one shares three layers, and top layer is provided with described aerial radiation knot
Structure, intermediate layer are dielectric layer, and bottom is ground floor；Top layer is the high material of electric conductivity；Described medium substrate is epoxy resin
Glass mat and other PCB medium substrates.
A kind of near-field readers antenna array for unmanned cash register platform proposed by the present invention, by multiple described readings
Device antenna, is arranged in parallel within approximately the same plane and direction is identically formed antenna array.
The bottom surface of space structure, top surface and side wall is any or selection several times install multiple reader days arranged in parallel respectively
Line group battle array.During reading, with certain frequency and the RFID reader antennas of order switch operating, make reading range covering whole empty
Between.
3rd, technique effect caused by the present invention.
(1) antenna is planar structure, simple in construction, easy to process, can use common FR4 as substrate, cost of manufacture
It is low.
(2) antenna size is larger, has that reading range coverage rate is big, thickness of thin, the characteristics of light weight, particularly suitable for
It is required that read in the big unmanned charge platform RFID system of area.
(3) antenna uses leaky wave effect of the electromagnetic wave in microstrip line transmitting procedure, the principle based on field coupling, reads
Device antenna with the label antenna of read line ring type, can also both read the label antenna of class dipole, and antenna has more flexibility.
(4) antenna uses serpentine configuration so that electric current is spatially to belong to superposition in the same direction, eliminates electric current and reversely weakens electricity
The effect of field.Therefore near-field region electric field intensity inside high is strong, and larger reading distance is also can obtain using relatively low power, can be used for
In the UHF near field RFID systems of various low-power consumption, especially suitable for needing the unmanned cash register platform of certain reading distance.
(5) Antenna Far Field gain is relatively low, can avoid misreading far-field tags, while also reduces other systems to nobody
The interference of RFID system.Antenna Far Field gain is relatively low, because antenna medium substrates are relatively thin, electromagnetic wave is strapped in day as far as possible
Line between microstrip line.Antenna with the sense of current of microstrip line on the contrary, causing the electromagnetic field in far field to be cancelled out each other, far field increases
Beneficial step-down.
(6) antenna electric field polarization mode near-field region uses multipolarization, can be avoided due to label day in near-field region
Line be intended to different directions and caused by skip.
(7) present invention can be applicable to uhf band, and working frequency range is：It is a to have in 900MHz~918MHz frequency ranges
The near field RFID reading and writing device antenna of stronger near field electric-field intensity and relatively low far gain.
Brief description of the drawings
Fig. 1 is the top-most-surface plane structural representation of UHF near-field RFID reader-writer antenna；
Fig. 2 is the side schematic view of UHF near-field RFID reader-writer antenna；
Fig. 3 is electromagnetic wave in microstrip line mode of propagation schematic diagram；
The coordinate graph of a relation of Fig. 4 straight line element antennas；
Fig. 5 is surface current distribution of the antenna when exciting current phase is 0 degree in embodiment 1；
Fig. 6 is the reflection coefficient chart of antenna in embodiment 1；
Fig. 7 is in embodiment 1, the polarised direction figure of electric field during apart from antenna surface height z=200mm；
Fig. 8 is Antenna Far Field gain curve figure in embodiment 1；
Fig. 9 is the particular location figure in unmanned cash register platform antenna group battle array；
Figure 10 is the RFID near field antenna array and refrigerator schematic side view for unmanned retail refrigerator.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are unlimited
In this.
Embodiment 1
As shown in figure 1, the near-field readers antenna proposed by the present invention for unmanned cash register platform, including sub-miniature A connector 1,
Feed port 2, antenna match minor matters 3, power distribution minor matters 4, antenna micro strip radiation minor matters, phase shift minor matters；Antenna feed port is adopted
Directly it is connected with a sub-miniature A connector 1 with the one end of feed port 2, the other end is connected with antenna match minor matters 3；Antenna match minor matters 3
It is connected with the power divider 4 of antenna, antenna power distributor 4 is connected with antenna micro strip radiation minor matters.Feed port 2 is 50 Europe
Nurse microstrip line.As shown in Fig. 2 described antenna one shares three layers, top layer 11 is provided with structure as claimed in claim 1, middle
Layer is dielectric layer 12, and bottom is ground floor 13.Described antenna current feed port, antenna match minor matters, aerial radiation structure etc. are micro-
The material of band structure can be other materials with preferable electric conductivity such as copper, aluminium, silver.Described medium substrate is epoxy resin
Glass mat and other PCB medium substrates.
Antenna micro strip radiation minor matters include antenna minor matters and the horizontally arranged antenna minor matters that vertical direction is set, shape
Into serpentine configuration, current direction is identical on regulation partial vertical direction, identical with current direction in local horizontal direction；Antenna is micro-
Band radiation branch current flows to identical microstrip line insertion phase shift minor matters, makes its spatial altitude identical.Serpentine configuration can be turning
It is snakelike for the micro-strip of circular arc, or turning is right angle micro-strip serpentine configuration.
Embodiment 2
UHF near field RFID reader antennas for unmanned cash register platform.Fig. 1 is UHF near-field RFID reader-writer antenna
Top-most-surface plane structural representation.As shown in figure 1, antenna is by SMA joints 1, feed port 2, antenna match minor matters 3, power distribution
Minor matters 4, phase minor matters 5 are moved to left, move to right phase minor matters 6, antenna micro strip radiation minor matters composition.Fig. 2 is UHF near-field RFID reader-writer antenna
Side schematic view, as shown in Fig. 2 antenna one shares three layers, top layer 11, dielectric layer 12, ground floor 13, antenna feed port uses
One sub-miniature A connector 1 is directly connected with 50 ohm microstrips 2 so that feeder line is matched well with antenna, and installation is firm, easily
In welding.SMA heads are welded in the one end of 50 ohm microstrip 2, and the other end is connected with matching minor matters 3.Antenna match minor matters 3 and antenna
Power divider 4 is connected.
Antenna match minor matters are the principles based on a quarter impedance transformer：Any point is defeated in known input transmission line
Entering impedance is：When length of transmission line is equal to a quarter guide wavelength and load impedance ZLTo be pure
During resistance, tan β l=∞ are thenWherein ZcThe characteristic impedance of minor matters is converted for impedance.If there is the characteristic of one section of transmission line
Impedance is Z1, load as Z2, to cause impedance and the load matched of transmission line, only need to insert one section of quarter-wave micro-strip
Minor matters are matched, the characteristic impedance of the matching minor matters is Zc, then have：BothIt can utilize and be calculated
It is Z to obtain impedance conversion minor matters characteristic impedancec, because the substrate used is relatively thin, using wideband microband line empirical equation：
εrFor medium substrate relative dielectric constant.Be then based on principles above, can with arrive micro belt line width.Because at this
In example antenna, load is not necessarily real impedance, so optimizing corresponding length and width so that antenna is corresponding
RFID band operations.
Fig. 3 is mode of propagation schematic diagram of the electromagnetic wave in microstrip line, as shown in figure 3, because the microstrip line leaky wave of use is imitated
The near field antenna that should be formed, microstrip line cover more spaces as far as possible, and Electric Field Distribution will be more uniformly distributed.To make antenna Electric Field Distribution
Uniformly, one-to-two, then two point four of power distribution mode are used using power allocation scheme, the power divider 4 of antenna so that
The electric field of aerial radiation can uniformly cover antenna near-field region as far as possible.Due to the distribution of power, necessarily cause on microstrip line
Discontinuity, cause impedance mismatch, antenna port effect is very strong, and reflection is very big, and antenna can not produce very strong near field
Electric field.In order to solve the transmission discontinuous problem brought due to power distribution, addition antenna match minor matters 3, can eliminate
The impedance mismatch problem that power distribution is brought so that antenna feed electric energy enough directly using existing commercialization high frequency cable, is realized
The maximum propagation effect of electromagnetic wave.Impedance matching minor matters influence the reflectance factor of antenna, can change matching minor matters 3 by regulation
Length and width adjusts the reflectance factor size of antenna and bandwidth of operation.Microstrip line electrical length in power divider 4 and
Line width, it is determined by RFID working frequencies.
Embodiment 3
The aerial radiation structure is made up of two sections of phase-shift structures and four sections of microstrip line serpentine configurations.Four sections of microstrip lines
Two sections of micro-strip serpentine configurations use monosymmetric form in serpentine configuration, and two other microstrip line serpentine configuration is using approximation two
Side mirror image forms, and the path length of four sections of microstrip lines is identical, and four sections of snakelike microstrip structure ends are using open circuit shape
State.
Antenna micro strip radiates four sections of minor matters, respectively upper left microstrip line 7, and lower-left microstrip line 8, upper right microstrip line 9, bottom right is micro-
Band line 10,8 setting symmetrical above and below of upper left microstrip line 7 and lower-left microstrip line, upper right microstrip line 9 and bottom right microstrip line mirror image about 10
It is symmetrical arranged；
Upper left microstrip line 7 and lower-left microstrip line 8 divide the minor matters and vertical direction minor matters for horizontal direction, using snakelike knot
Structure, by adjusting length horizontally and vertically, upper left microstrip line 7 and lower-left microstrip line 8 electric current in vertical direction
Flow to it is identical, vertical direction straight line linear oscillator formed line array；Upper right microstrip line 9 and bottom right microstrip line 10 are adjusted, passes through tune
The minor matters in horizontal direction and the minor matters length of vertical direction so that the sense of current in each minor matters can phase in the horizontal direction
Together；Two sections of phase-shift structures use U-shape structure, and in first paragraph U type phase-shift structures, two side arms are longer, the U-shaped knot of second segment
Two side arms in structure are shorter, strengthen antenna micro strip line same direction current, near field electric field is produced more polarised directions.Described U
Type phase-shift structure can be that perpendicular shape is alternatively flat shape.
Lower-left microstrip line 8 inserts one section of U-shaped left micro-strip phase-shift structure 6, adjusts the brachium of left micro-strip phase-shift structure 6, makes
It is identical to obtain spatially current direction of the upper left microstrip line 7 with lower-left microstrip line 8 in vertical direction；Upper right microstrip line 9 with the addition of
One section moves to right phase structure 5；Regulation moves to right the brachium of phase structure 5 so that on upper right microstrip line 9 and the horizontal direction of bottom right microstrip line 10
Spatially current direction it is in the same direction.
Upper left microstrip line 7 is vertical with the sense of current of upper right microstrip line 9, lower-left microstrip line 8 and the electric current side of bottom right microstrip line 10
To vertical.
The principle transmitted according to electromagnetic wave under corresponding working frequency by microstrip line；High frequency electric passes through microstrip line half
After the length of wavelength, its corresponding sense of current will occur reverse.Using snakelike structure, by adjusting horizontal direction and vertical
The length in direction, it is possible to achieve electric current flowing to spatially is identical in the range of several wavelength.Therefore upper left microstrip line 7 uses
This principle adjusts corresponding length, realizes that electric current identical can flow in vertical direction, the radiated electric field that can be thus
Increase, eliminate electric current it is reverse caused by negative function.Line array, straight line are formed equivalent in vertical direction straight line linear oscillator
The coordinate relation shaken is as shown in Figure 4.
In Fig. 4, the near field electric field of straight line oscillator and the approximate expression in magnetic field are：
Then in near-field region, the electric field of straight line oscillator is overlapped mutually, and forms larger electric field, so as to meet farther out
Identify distance.Using the design principle of upper left microstrip line 7, lower-left microstrip line 8 is designed.The He of upper left microstrip line 7 can so be realized
The sense of current of lower-left microstrip line 8 is all identical in vertical direction respectively.Same principle, the He of upper right microstrip line 9 can be adjusted
Bottom right microstrip line 10 so that the sense of current in each minor matters can be identical in the horizontal direction.
In order to spatially realize that the electric current of upper left microstrip line 7 and lower-left microstrip line 8 is in the same direction, introduce one section it is U-shaped
Phase shift minor matters.Adjust the brachium of U-shaped phase shift minor matters, it is possible to change the phase of electric current so that upper left microstrip line 7 and lower-left micro-strip
The flow direction of the electric current of line 8 spatially is consistent.For upper right microstrip line 9 and bottom right microstrip line 10, to cause them in sky
Between on the sense of current it is identical, employ a kind of specular mode and add phase shift minor matters mode.From spatially,
The sense of current of upper left microstrip line 7 and upper right microstrip line 9 is vertical, the electric current side of lower-left microstrip line 8 and bottom right microstrip line 10
To being also vertical.The arm lengths of U-shaped minor matters are adjusted respectively so that electric field of the antenna in space produces multipolarization effect.
Fig. 5 is the antenna surface current distributing figure when exciting current phase is 0 degree.
Fig. 6 is the reflection coefficient chart of antenna, as shown in fig. 6, antenna operating band is 900MHz-918MHz, is adapted to
RFID system for uhf band.
The polarised direction figure of electric field when Fig. 7 is apart from antenna surface height z=200mm, as shown in fig. 7, arrow represents electricity
Field polarised direction, near-field region internal electric field polarised direction is multipolarization, and E field polarization direction top half realizes anticlockwise, lower half
Right rotation is realized in part, has multipolarization effect in antenna near-field region.The label antenna arbitrarily put can be read.
Fig. 8 is Antenna Far Field gain curve figure, as shown in figure 8, because medium substrate is thin, electric current on antenna micro strip line with
The ground sense of current is on the contrary, far field electromagnetic field is cancelled out each other.The far gain of antenna is less than -8dBi, entire gain than relatively low, when
It when label is away from antenna certain distance, will not be read, can avoid misreading label.
Embodiment 4
RFID near field antenna array for unmanned cash register platform.Fig. 9 is in the specific of unmanned cash register platform antenna group battle array
The location drawing, as shown in fig. 7, unmanned cash register platform is the box-structure of rear and front end opening, the meaning of arrow 14 is rear and front end face,
Bulk is 400*300*250mm.Antenna array is made up of 4 near field RFID reader antennas, and two one group is installed respectively
In the bottom surface of unmanned cash register platform and a side, a L-type platform is formed.
During cash register working platform, the commodity of label enter cash register platform space with the direction of arrow 14, and single RFID is read
Whole cash register platform space can not be completely covered, it is necessary to using near field RFID reader antenna group by reading the read range of device antenna
Battle array, during reading, with certain frequency and order switch operating RFID reader antenna, reading range is set to cover whole cash register platform empty
Between, rested in commodity in the time of cash register platform and read all Commercial goods labelses.
As the extension of the present invention, unmanned cash register plateform system can use RFID near field antenna array and image recognition simultaneously
Technology carries out the identification of commodity.Camera device is installed in platform space, profit relatively low commodity cheap for some,
Or the commodity of effect difference are read for RFID such as mental package/liquid, the side of the image recognition of machine learning can be taken based on
Formula is identified；For other commodity, then it is identified by the way of RFID near field antenna array identifies label, so as to improve
Read rate.
Embodiment 5
RFID near field antenna array for unmanned retail refrigerator.Figure 10 is the RFID near field day for unmanned retail refrigerator
Line group battle array and refrigerator schematic side view, as shown in Figure 10, near-field readers antenna 15,16,17,18 are installed on the top of refrigerator
And on each layer of dividing plate, label 19 on commodity, each layer of commodity are identified by the near-field readers antenna of this layer.
During work, reader identifies the commodity in refrigerator with certain frequency, and customer logs system opens refrigerator and takes commodity away, turns a refrigerator off
Door, compare the commodity that reader identifies before and after taking out, obtain being removed merchandise news, connection user account is withholdd.Close
Before upper refrigerator doors, customer can change wish and put back to the commodity taken out, and this point is than the image recognition side based on machine learning
Formula is easily more.
Near-field readers antenna and antenna array proposed by the present invention for unmanned cash register platform is not only limited to nobody
Cashier and unmanned cash register refrigerator, any can use closely identify that the environment of commodity or article can use, cost is low,
Identification distance range is relatively wide, strong antijamming capability, and the occasion used is a lot
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
In the description of the invention, it is to be understood that the term of indicating position or position relationship is based on shown in accompanying drawing
Orientation or position relationship, be for only for ease of the description present invention and simplify description, rather than instruction or imply signified equipment
Or element there must be specific orientation, with specific azimuth configuration and operation, therefore it is not considered as limiting the invention.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements.For the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
Claims (10)
- A kind of 1. near-field readers antenna for unmanned cash register platform, it is characterised in that：Its aerial radiation structure includes antenna Micro-strip radiation minor matters, phase shift minor matters；Antenna micro strip radiation minor matters include antenna micro strip line and the horizontal direction that vertical direction is set The antenna micro strip line of setting, forms serpentine configuration, and the horizontal and vertical length of regulation microstrip line makes electric current on partial vertical direction Flow to it is identical, it is identical with current direction in local horizontal direction；Phase shift minor matters are inserted in the part of the identical flow direction of antenna micro strip line, Make the spatial altitude of same direction current identical.
- 2. the near-field readers antenna according to claim 1 for unmanned cash register platform, it is characterised in that：Described snake The turning of shape structure is the micro-strip serpentine configuration at circular arc or right angle.
- 3. the near-field readers antenna according to claim 1 for unmanned cash register platform, it is characterised in that：The antenna Irradiation structure is made up of two sections of phase shift minor matters structures and four sections of antenna micro strip line serpentine configurations；Four sections of antenna micro strip lines are snakelike Two sections of micro-strip serpentine configurations use monosymmetric form in structure, and current direction is identical in vertical direction；Two other is micro- Band line serpentine configuration uses approximate both sides mirror image forms, and the sense of current flows to identical, and four sections of microstrip lines in the horizontal direction Path length it is identical, four sections of snakelike microstrip structure ends use open-circuit condition, and two sections of phase-shift structures are located at both sides pair respectively Claim in the micro-line of micro-strip and in the micro-line of both sides mirror type micro-strip, to realize that the spatial altitude in same current direction is identical.
- 4. the near-field readers antenna according to claim 3 for unmanned cash register platform, it is characterised in that：Described two sections Phase shift minor matters structure uses U-shape structure, and in the U-shaped phase-shift structure of first paragraph, two side arms are longer, and two in second segment U-shape structure Side arm is shorter, strengthens antenna micro strip line same direction current, near field electric field is produced more polarised directions.
- 5. the near-field readers antenna according to claim 3 for unmanned cash register platform, it is characterised in that：Described U Type phase shift minor matters structure is perpendicular shape or flat shape.
- 6. the near-field readers antenna according to claim 1 for unmanned cash register platform, it is characterised in that：Also include Sub-miniature A connector, feed port, antenna match minor matters, power distribution minor matters；Antenna feed port using a sub-miniature A connector directly with feedback Electric port one end connection, the other end are connected with antenna match minor matters；Antenna match minor matters are connected with the power divider of antenna, day Linear heat generation rate distributor is connected with antenna micro strip radiation minor matters.
- 7. the near-field readers antenna according to claim 6 for unmanned cash register platform, it is characterised in that：Described feedback Electric port is 50 ohm microstrips.
- 8. the near-field readers antenna according to claim 1 for unmanned cash register platform, it is characterised in that：Described day Line one shares three layers, and top layer is provided with the aerial radiation structure as described in claim 1-5 is any, and intermediate layer is dielectric layer, bottom For ground floor；Top layer is the high material of electric conductivity；Described medium substrate is epoxy resin fiberglass plate and other PCB media Substrate.
- A kind of 9. near-field readers antenna array for unmanned cash register platform, it is characterised in that：By multiple such as claim 1-5 Any described reader antenna, is arranged in parallel within approximately the same plane and direction is identically formed antenna array.
- 10. the near-field readers antenna array according to claim 9 for unmanned cash register platform, it is characterised in that：It is empty Between the bottom surface of structure, top surface and side wall is any or selection several times install multiple reader antenna group battle arrays arranged in parallel respectively.
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| CN201711010578.5A CN107799873B (en) | 2017-10-26 | 2017-10-26 | Near field reader antenna and antenna array for unmanned cashier platform |
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| CN201711010578.5A CN107799873B (en) | 2017-10-26 | 2017-10-26 | Near field reader antenna and antenna array for unmanned cashier platform |
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| CN107799873A true CN107799873A (en) | 2018-03-13 |
| CN107799873B CN107799873B (en) | 2024-01-09 |
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| CN112186333A (en) * | 2020-09-29 | 2021-01-05 | 华南理工大学 | Base station antenna, radiation unit and radiation arm |
| CN112335125A (en) * | 2018-06-12 | 2021-02-05 | Iee国际电子工程股份公司 | Antenna array system for monitoring vital signs of a person |
| CN116933815A (en) * | 2023-09-15 | 2023-10-24 | 华南理工大学 | Miniaturized reader-writer antenna capable of realizing space three-dimensional field uniformity and method |
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| CN116933815B (en) * | 2023-09-15 | 2024-02-06 | 华南理工大学 | Miniaturized reader-writer antenna capable of realizing space three-dimensional field uniformity and method |
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| CN107799873B (en) | 2024-01-09 |
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