Invention content
The present invention provides a kind of hyperfrequency near field antenna being evenly distributed, it is intended to overcome existing near field antenna cannot unidirectional spokeThe present situation penetrated.
Present invention employs following technical measures：
A kind of hyperfrequency near field antenna being evenly distributed, including be arranged in order and the first substrate disposed in parallel, the second basePiece and reflector plate；
First substrate is equipped near field antenna, and the near field antenna includes being connected with each other rectangular portion and current feed department, the squareShape portion includes the first rectangle and the second rectangle, and the area of first rectangle is less than second rectangle, and the current feed department is located atSide of second rectangle far from first rectangle, first substrate is for emitting normal direction magnetic field；
Second substrate is equipped with the periodic unit according to matrix arrangement, and the periodic unit forms N row * M row, the week per a linePhase unit is parallel to the connecting line of first rectangle and second rectangle；Each periodic unit is square, each periodUnit includes four conducting wires drawn respectively from the square quadrangle, four conducting wires about the square center at centerSymmetrical structure；With in a line, the spacing between the conductor width and conducting wire of each periodic unit is equal, in same row, along describedOn one rectangle to the direction of second rectangle, the conductor width of each periodic unit successively decreases, and the spacing between conducting wire is incremented by；
Reflector plate makes normal direction magnetic field one-way radiation for reflecting the normal direction magnetic field.
As a further improvement, each conducting wire includes the first connecting portion being linked in sequence, second connecting portion, third interconnecting pieceAnd the 4th interconnecting piece；Four apex angles in the square are arranged in each first connecting portion respectively；Each second connecting portion is leaned onThe setting on one side of the nearly square, and be in the direction of extension P1 with the spacing of adjacent second connecting portion；Each third connectsSocket part is in the direction of extension P1 with the spacing of adjacent third interconnecting piece perpendicular to coupled second connecting portion；OftenOne the 4th interconnecting piece is perpendicular to coupled third interconnecting piece, and the spacing with the 4th adjacent interconnecting piece in the direction of extensionFor P1.
As a further improvement, in each periodic unit, the width P2 of the conducting wire and P1's and it is equal.
As a further improvement, in each periodic unit P2 and P1's and value range be 4mm-5mm.
As a further improvement, the periodic unit of the first row on first rectangle to the direction of second rectangleIn, the value range of P1 is 1.9mm-2.1mm, and the value range of P2 is 2.15mm-2.35mm.
As a further improvement, in same row, the difference of two neighboring periodic unit P1 is 0mm-0.9mm.
As a further improvement, the value range of the length of side L of the periodic unit is 25mm-26mm.
As a further improvement, the spacing of first substrate and second substrate is 4mm-6mm, second substrateSpacing with the reflector plate is 9mm-11mm.
As a further improvement, the thickness of first substrate and second substrate is 0.6mm-1mm, and described firstSubstrate is identical with the thickness of second substrate.
As a further improvement, the periodic unit forms the array arrangement of 10 row * 10 row.
Compared with prior art, the present invention has the following advantages：
The present invention provides a kind of hyperfrequency near field antenna being evenly distributed, and the present invention uses three-decker, on the first substrateEquipped near field antenna, for emitting normal direction magnetic field, the second substrate is equipped with periodic unit, and the first substrate of cooperation makes normal direction magnetic field edgeThe direction of vertical first substrate radiates, and reflector plate is made using aluminum alloy materials, can reflect normal direction magnetic field, the method for making antenna send outOne-way radiation is realized to magnetic field.Meanwhile the specification by improving periodic unit, ensure that each periodic unit is led in a lineSpacing between line width and conducting wire is equal, in same row, along first rectangle to the direction of second rectangle, and Mei YizhouThe conductor width of phase unit successively decreases, and the spacing between conducting wire is incremented by, and makes the normal direction magnetic field of each position of antenna in radiation directionRadiation length is identical, to the reading of RFID tag apart from identical, keeps reading better.
Description of the drawings
Attached drawing 1 is a kind of structural schematic diagram for the hyperfrequency near field antenna being evenly distributed of the present invention.
Attached drawing 2 is a kind of structural schematic diagram for the first substrate of hyperfrequency near field antenna being evenly distributed of the present invention.
Attached drawing 3 is a kind of structural schematic diagram for the second substrate of hyperfrequency near field antenna being evenly distributed of the present invention.
Attached drawing 4 is a kind of structural schematic diagram for the hyperfrequency near field antenna periodic unit being evenly distributed of the present invention.
Attached drawing 5 is a kind of structural schematic diagram for the hyperfrequency near field antenna zero phase-shift offset line being evenly distributed of the present invention.
Attached drawing 6 is simulation result when a kind of hyperfrequency near field antenna periodic unit specification being evenly distributed of the present invention is identicalFigure.
Simulation result when attached drawing 7 is a kind of hyperfrequency near field antenna periodic unit specification gradual change being evenly distributed of the inventionFigure.
Main element symbol description
First substrate 1
Rectangular portion 11
First rectangle 111
Second rectangle 112
Current feed department 12
Second substrate 2
Periodic unit 21
Conducting wire 211
First connecting portion 211-A
Second connecting portion 211-B
Third interconnecting piece 211-C
4th interconnecting piece 211-D
Reflector plate 3
Specific implementation mode
To keep the purpose, technical scheme and advantage of embodiment of the present invention clearer, implement below in conjunction with the present inventionThe technical solution in embodiment of the present invention is clearly and completely described in attached drawing in mode, it is clear that described realityThe mode of applying is some embodiments of the invention, rather than whole embodiments.Based on the embodiment in the present invention, abilityThe every other embodiment that domain those of ordinary skill is obtained without creative efforts, belongs to the present inventionThe range of protection.Therefore, the detailed description of the embodiments of the present invention to providing in the accompanying drawings is not intended to limit and wants belowThe scope of the present invention of protection is sought, but is merely representative of the selected embodiment of the present invention.Based on the embodiment in the present invention,The every other embodiment that those of ordinary skill in the art are obtained without creative efforts belongs to thisInvent the range of protection.
In the description of the present invention, it is to be understood that, the orientation or positional relationship of the instructions such as term "upper", "lower" is baseIt in orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than indicates or implySignified equipment or element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as to thisThe limitation of invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importanceOr implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed orImplicitly include one or more this feature.In the description of the present invention, the meaning of " plurality " is two or more,Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connectsIt connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elementsThe interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelingsCondition understands the concrete meaning of above-mentioned term in the present invention.
Present invention is further described in detail with specific implementation mode below in conjunction with the accompanying drawings：
Please refer to Fig.1-Fig. 5, the present embodiment provides a kind of hyperfrequency near field antennas being evenly distributed, including be arranged in order andFirst substrate 1, the second substrate 2 and reflector plate 3 disposed in parallel；
Referring to FIG. 2, in the present embodiment, the first substrate 1 is equipped near field antenna, and the near field antenna includes being connected with each otherRectangular portion 11 and current feed department 12, the rectangular portion 11 include the first rectangle 111 and the second rectangle 112, first rectangle 111Area is less than second rectangle 112, and the current feed department 12 is located at second rectangle 112 far from first rectangle 111Side, first substrate 1 is for emitting normal direction magnetic field.The near field antenna is made of zero phase-shift offset line, and described closeThe length of side of antenna several " convex " font circuits as shown in figure 5, be made of, and adjacent " convex " font circuit direction phaseInstead.
It please refers to Fig.3 and Fig. 4, in the present embodiment, the second substrate 2 is equipped with the periodic unit 21 according to matrix arrangement, instituteIt states periodic unit 21 and forms N row * M row, first rectangle 111 and second rectangle are parallel to per a line periodic unit 21112 connecting line；Each periodic unit 21 is square, and each periodic unit 21 includes being drawn respectively from the square quadrangleFour conducting wires 211, center in a center of symmetry structure of four conducting wires 211 about the square；With in a line, each periodSpacing between 211 width of conducting wire and conducting wire 211 of unit 21 is equal, and in same row, described second is arrived along first rectangle 111On the direction of rectangle 112,211 width of conducting wire of each periodic unit 21 successively decreases, and the spacing between conducting wire 211 is incremented by；Described secondSubstrate 2 is used to coordinate the first substrate 1 that normal direction magnetic field is made to radiate along the direction of vertical first substrate 1.
Reflector plate 3 makes normal direction magnetic field one-way radiation for reflecting the normal direction magnetic field.
Referring to FIG. 4, in the present embodiment, each conducting wire 211 includes the first connecting portion 211-A being linked in sequence, the second companySocket part 211-B, third interconnecting piece 211-C and the 4th interconnecting piece 211-D；Each first connecting portion 211-A is separately positioned on instituteState four apex angles of square；Each second connecting portion 211-B close to the square setting on one side, and in the direction of extensionSpacing with adjacent second connecting portion 211-B is P1；Each third interconnecting piece 211-C is perpendicular to the second coupled connectionPortion 211-B, and be in the direction of extension P1 with the spacing of adjacent third interconnecting piece 211-C；Every 1 the 4th interconnecting piece 211-D hangs downDirectly in coupled third interconnecting piece 211-C, and the spacing with the 4th adjacent interconnecting piece 211-D is in the direction of extensionP1。
Near field antenna provided in this embodiment is three-decker, wherein the first substrate 1 is equipped near field antenna, for sending outNormal direction magnetic field is penetrated, the second substrate 2 is equipped with periodic unit 21, and the first substrate 1 of cooperation makes normal direction magnetic field along vertical first substrate 1Direction radiates, and reflector plate 3 is made using aluminum alloy materials, can reflect normal direction magnetic field, so that the normal direction magnetic field that antenna is sent out is realized singleTo radiation.The near field antenna of one-way radiation can allow user to select the radiation direction of antenna according to demand, and ability is all usedIn the radiation of single direction, both reduce the usage amount of whole capability, and also considerably increases the utilization rate of ability.
Meanwhile being obtained by practical test, referring to FIG. 6, when not having the specification all same of each periodic unit 21, near fieldAntenna is different in the reading distance of different location, that is to say, that normal direction magnetic field is different in the radiation length of different location, this is existingAs reading effect of the antenna to RFID tag can be influenced.In order to solve this problem, in the present embodiment, period list is strictly setThe specification of member 21 ensures that the spacing between 211 width of conducting wire and conducting wire 211 of each periodic unit 21 is equal, same in a lineIn row, along first rectangle 111 to the direction of second rectangle 112,211 width of conducting wire of each periodic unit 21 is passedSubtract, the spacing between conducting wire 211 is incremented by, that is, P1 successively decreases, and P2 is incremental, by this setting, referring to FIG. 7, antenna is each at this timeThe radiation length of the normal direction magnetic field of a position in radiation direction is identical, to the reading of RFID tag apart from identical, reading is made to imitateFruit is more preferably.
Further, in this embodiment to ensure the reading distance in normal direction magnetic field in controlled range, each period is singleIn member 21, the width P2 of the conducting wire 211 and P1's and it is equal, in the present embodiment, P2 and P1 in each periodic unit 21The value range of sum is 4mm-5mm.
Further, in this embodiment to ensure that normal direction magnetic field radiation distance and radiation intensity reach requirement, along instituteIn the periodic unit 21 for stating the first row on the first rectangle 111 to the direction of second rectangle 112, also it is located next to be inZero phase deviates in a line periodic unit 21 of line, and the value range of P1 is 1.9mm-2.1mm, and the value range of P2 is2.15mm-2.35mm。
Further, in this embodiment in order to make the normal direction magnetic field radiation distance of each position of antenna evenly, same rowIn, the difference of two neighboring periodic unit 21P1 is 0mm-0.9mm.
Further, in this embodiment in order to make the radiation direction in normal direction magnetic field as far as possible perpendicular to first baseThe value range of piece 1 and more preferable to the reading effect of RFID tag, the length of side L of the periodic unit 21 is 25mm-26mm, describedThe spacing of first substrate 1 and second substrate 2 is 4mm-6mm, and the spacing of second substrate 2 and the reflector plate 3 isThe thickness of 9mm-11mm, first substrate 1 and second substrate 2 is 0.6mm-1mm, and first substrate 1 and describedThe thickness of second substrate 2 is identical, and the periodic unit 21 forms the array arrangement of 10 row * 10 row.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present inventionWith within principle, any modification, equivalent substitution, improvement and etc. done should be included within the scope of protection of the invention god.