CN101110494B - Flat plate antenna of radio frequency identification tag - Google Patents
Flat plate antenna of radio frequency identification tag Download PDFInfo
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- CN101110494B CN101110494B CN2006101056442A CN200610105644A CN101110494B CN 101110494 B CN101110494 B CN 101110494B CN 2006101056442 A CN2006101056442 A CN 2006101056442A CN 200610105644 A CN200610105644 A CN 200610105644A CN 101110494 B CN101110494 B CN 101110494B
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Abstract
A plate antenna with a radio frequency identification tag receives an electromagnetic signal, which comprises a dielectric slab and a fractal dipole antenna. Wherein, height of the fractal dipole antenna achieves 30% to 70% of half wavelength of the electromagnetic signal, and width of the antenna reaches 70% to 110% of half length of the electromagnetic signal. The plate antenna utilizes an optimal size of the fractal dipole antenna to fulfill miniature and excellent matching.
Description
Technical field
The invention relates to a kind of plate aerial, and particularly about a kind of plate aerial that is applicable to radio-frequency (RF) identification (radio frequency identification is called for short RFID) label.
Background technology
Radio-frequency recognition system is because of having contactless identification, read advantages such as a plurality of labels and Information Security simultaneously in recent years, and replaces existing bar coded sticker system gradually.The range of application of radio-frequency recognition system is considerably extensive, for example gate inhibition's card, EasyCard, plant identification chip etc., and future also can be towards logistics keyholed back plate, taking care of books, and application such as medical medicine management.
Radio-frequency recognition system mainly comprises reads code system (reader system) and tag system (tag system).Reading code system utilizes electromagnetic signal that tag message is sent to tag system.Tag system utilizes plate aerial transmitting-receiving electromagnetic signal, and differentiates the tag message that electromagnetic signal is carried by label chip, and whether decision is back to tag message and reads code system.Come one in the process that transmits tag message reading code system and tag system one, whether tag system is to have enough power regular events are not arranged, perhaps tag message can be back to and read code system, all depends on the impedance matching of plate aerial and label chip.Because when plate aerial and label chip have good impedance matching, maximum power transmission will be arranged between plate aerial and the label chip.
General tag system adopts the design of double-doublet antenna (dipole antenna) as plate aerial.Shown in the classic flat-plate antenna structure view of Fig. 1, traditional lithographic plate antenna 100 comprises dielectric-slab 110 and double-doublet antenna 120, and wherein double-doublet antenna 120 is configured on the surface 111 of dielectric-slab 110.Yet traditional lithographic plate antenna 100 is oversize because of double-doublet antenna 120 often, and can't reach microminiaturized purpose.
In order to address the above problem, classic flat-plate antenna 200 adopts the mode of double-doublet antenna in conjunction with fractal (fractal) structure, carries out the design of plate aerial.Shown in another classic flat-plate antenna structure view of Fig. 2.In order to reach microminiaturized purpose, classic flat-plate antenna 200 breaks up double-doublet antenna 120, make traditional fractal dipole aerial 210 have the fractal structure that forms because of differentiation, wherein fractal structure mean traditional fractal dipole aerial 210 by a plurality of radiation assemblies (the inferior radiation assembly 211～216 that indicates such as Fig. 2) constitute, and radiation assembly all has identical geometric figure (such as equilateral triangle) each time, and the width of traditional fractal dipole aerial 210 is with highly then shown in the arrow of Fig. 2.Yet though classic flat-plate antenna 200 has reached microminiaturized purpose, 50 ohm of coupling ideas that it adopted but can't reach good impedance matching with label chip.
In sum, the classic flat-plate antenna can't be taken into account purpose microminiaturized and impedance matching on using.In other words, radio-frequency recognition system is using under the classic flat-plate antenna, and therefore its decipherment distance of containing will be restricted, and can't be widely used in other system.
Summary of the invention
The plate aerial that the purpose of this invention is to provide a kind of RFID tag carries out optimized design by the height and the width to fractal dipole aerial, and then reaches good impedance match and microminiaturized purpose between plate aerial and the label chip.
For reaching above-mentioned or other purpose, the present invention proposes a kind of plate aerial of RFID tag, and in order to receive and dispatch an electromagnetic signal, this plate aerial comprises: a dielectric-slab; An and fractal dipole aerial, be configured on the surface of this dielectric-slab, the height of this fractal dipole aerial is 0.3～0.7 times of half-wavelength of this electromagnetic signal, the width of this fractal dipole aerial is 0.7～1.1 times of half-wavelength of this electromagnetic signal, and this fractal dipole aerial comprises: one first radiation assembly has a fractal structure; One second radiation assembly has this fractal structure, and this fractal structure comprises an isoceles triangle shape border; An and signal feed-in line group, in order to transmit signal, wherein first side of this first radiation assembly is coupled to this signal feed-in line group, and first side of this second radiation assembly is coupled to this signal feed-in line group, and this second radiation assembly and this first radiation assembly are symmetrical in the both sides of this signal feed-in line group, wherein the summit on this isoceles triangle shape border is coupled to this signal feed-in line group, the base on this isoceles triangle shape border is second side of this first radiation assembly or second side of this second radiation assembly, wherein the height of this fractal dipole aerial is the distance of second side of this first radiation assembly to second side of this second radiation assembly, and the width of this fractal dipole aerial is the width of second side of this first radiation assembly.
The present invention also proposes a kind of plate aerial of RFID tag, is applicable to a label chip to receive and dispatch an electromagnetic signal, and this plate aerial comprises: a dielectric-slab; An and fractal dipole aerial, be configured on the surface of this dielectric-slab, the height of this fractal dipole aerial is 0.3～0.7 times of half-wavelength of this electromagnetic signal, the width of this fractal dipole aerial is 1～2 times of imaginary impedance value of this label chip, the unit of above-mentioned width is a millimeter, and this fractal dipole aerial comprises: one first radiation assembly has a fractal structure; One second radiation assembly has this fractal structure, and wherein this fractal structure comprises an isoceles triangle shape border; An and signal feed-in line group, in order to transmit signal, wherein first side of this first radiation assembly is coupled to this signal feed-in line group, and first side of this second radiation assembly is coupled to this signal feed-in line group, and this second radiation assembly and this first radiation assembly are symmetrical in the both sides of this signal feed-in line group, wherein the summit on this isoceles triangle shape border is coupled to this signal feed-in line group, the base on this isoceles triangle shape border is second side of this first radiation assembly or second side of this second radiation assembly, wherein the height of this fractal dipole aerial is the distance of second side of this first radiation assembly to second side of this second radiation assembly, and the width of this fractal dipole aerial is the width of second side of this first radiation assembly.
The present invention also proposes a kind of plate aerial of RFID tag, in order to the transmitting-receiving electromagnetic signal.This plate aerial comprises dielectric-slab and fractal dipole aerial.Fractal dipole aerial is configured on the surface of dielectric-slab, and the height of fractal dipole aerial is 0.3～0.7 times of half-wavelength of electromagnetic signal, and the width of fractal dipole aerial is 0.7～1.1 times of half-wavelength of electromagnetic signal.Wherein fractal dipole aerial comprises the first isosceles triangle border and the second isosceles triangle border, and the height of fractal dipole aerial is the distance on base on the isosceles triangle border, base to the second on the first isosceles triangle border, and the width of fractal dipole aerial is the base width on the first isosceles triangle border.
From another viewpoint, the present invention reintroduces a kind of plate aerial of RFID tag, is applicable to that a label chip is with the transmitting-receiving electromagnetic signal.This plate aerial comprises dielectric-slab and fractal dipole aerial.Fractal dipole aerial is configured on the surface of dielectric-slab, and the height of fractal dipole aerial is 0.3～0.7 times of half-wavelength of electromagnetic signal, the width of fractal dipole aerial is 1～2 times of imaginary impedance value of label chip, the unit of above-mentioned width is a millimeter, and the unit of the imaginary impedance value of label chip is ohm.Wherein fractal dipole aerial comprises the first isosceles triangle border and the second isosceles triangle border, and the height of fractal dipole aerial is the distance on base on the isosceles triangle border, base to the second on the first isosceles triangle border, and the width of fractal dipole aerial is the base width on the first isosceles triangle border.
The present invention utilizes the wavelength of the electromagnetic signal that plate aerial receives and dispatches or the imaginary impedance value of label chip, to the length and wide restriction of plate aerial.Whereby, promote the impedance matching between plate aerial and the label chip, and reach microminiaturized purpose.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the structural representation of classic flat-plate antenna.
Fig. 2 is the structural representation of another classic flat-plate antenna.
Fig. 3 is the flat plate antenna structure schematic diagram according to the described RFID tag of one embodiment of the invention.
Fig. 4 is in order to the Smith chart of key diagram 3 impedance matchings (smith chart).
The primary clustering symbol description
100,200: traditional lithographic plate antenna
110,310: dielectric-slab
111,311: the surface of dielectric-slab
120: double-doublet antenna
210: traditional fractal dipole aerial
211～216,301～308: inferior radiation assembly
300: plate aerial
320: fractal dipole aerial
321: signal feed-in line group
321a, 321b: signal feed side
322: the first radiation assemblies
323: the second radiation assemblies
331,332: the isosceles triangle border
Embodiment
For the plate aerial that meets RFID tag use to be gone up required microminiaturization and impedance matching, the present invention draws optimized fractal dipole aerial size via repeatedly design and experimental result.Compare down with the classic flat-plate antenna, plate aerial of the present invention not only has microminiaturized outward appearance, also can promote effectively for the decipherment distance of radio-frequency recognition system.Below will enumerate explanation plate aerial of the present invention, but it is not that the insider can modify following embodiment slightly according to spirit of the present invention in order to qualification the present invention, but it still belongs to scope of the present invention.
Fig. 3 is the flat plate antenna structure schematic diagram according to the described RFID tag of one embodiment of the invention.The plate aerial 300 of present embodiment comprises dielectric-slab 310 and fractal dipole aerial 320.Fractal dipole aerial 320 is configured on the surface 311 of dielectric-slab.
Plate aerial 300 is in order to receive and dispatch an electromagnetic signal.It when the height of fractal dipole aerial 320 0.3～0.7 times of half-wavelength of electromagnetic signal, and when the width of fractal dipole aerial 320 is 0.7～1.1 times of half-wavelength of electromagnetic signal, plate aerial 300 will have best conjugate impedance match (complex conjugate) on using.For example, operate in the radio-frequency recognition system that frequency band is 915MHz, if plate aerial 300 is applied in the tag system, then plate aerial 300 will be as shown in Figure 4 with the impedance matching of label chip.At this moment, the resistance value of label chip is 6.7-j197.4, shown in the A point of Fig. 4.Desirable conjugate impedance match is then shown in the B point of Fig. 4, and this moment, label chip equated with the real impedance of plate aerial, and the equal and opposite in direction of imaginary impedance and positive and negative on the contrary.And plate aerial 300 of the present invention is under the electromagnetic signal of 915MHz at transmitting-receiving frequency, and its resistance value is shown in the C point of Fig. 4.Can be drawn by Fig. 4, the resistance value that resistance value that C is ordered and B are ordered is quite approaching.In other words, the impedance matching degree between plate aerial 300 and the label chip reaches optimization at this moment, and causing to have maximum power transmission between plate aerial 300 and the label chip.
In addition, the present invention draws the mode that above-mentioned plate aerial 300 reaches best conjugate impedance match via repeatedly design and experimental result, also can reach according to another optimized fractal dipole aerial size.This optimized fractal dipole aerial size is, the height of fractal dipole aerial 320 is 0.3～0.7 times of half-wavelength of electromagnetic signal, and the width of fractal dipole aerial 320 is 1～2 times of imaginary impedance value of label chip, wherein the unit of width is a millimeter, and the unit of the imaginary impedance value of label chip is ohm.
What deserves to be mentioned is that the material of dielectric-slab 310 comprises printed circuit board (PCB) and paper.And fractal dipole aerial 320 is a conductor, and this conductor comprises metallic conductor and electrically conductive ink.By the fractal dipole aerial 320 that electrically conductive ink constituted, can form by any printing technology (such as flat board, web plate, intaglio plate and letterpress technology) printing now.Therefore, plate aerial of the present invention has more the low and mass-produced advantage of cost in realization except reaching microminiaturized and good impedance match.
Continuation is with reference to Fig. 3.Fractal dipole aerial 320 comprises signal feed-in line group 321, first radiation assembly 322 and second radiation assembly 323, and wherein feed-in line group 321 comprises signal feed side 321a and 321b.First side of first radiation assembly 322 is coupled to the signal feed side 321a in the signal feed-in line group 321.First side of second radiation assembly 323 is coupled to the signal feed side 321b in the signal feed-in line group 321.And first radiation assembly 322 and second radiation assembly 323 are symmetrical in the both sides of signal feed-in line group 321.In addition, signal feed-in line group 321, first radiation assembly 322 and second radiation assembly 323 are positioned on the surface 311 of dielectric-slab 310.
Fractal dipole aerial 320 is spread out by double-doublet antenna and stretches, and the process of evolution is that double-doublet antenna is carried out fragmentation, so fractal dipole aerial 320 comprises the fractal structure that forms because of fragmentation.This fractal structure is encompassed in first radiation assembly 322 and second radiation assembly 323, and means first radiation assembly 322 and second radiation assembly 323 is made of a plurality of radiation assemblies respectively, and radiation assembly all has identical geometric figure each time.
Based on above-mentioned, with reference to Fig. 3 first radiation assembly 322 and second radiation assembly 323.First radiation assembly 322 comprises a plurality of radiation assemblies (Fig. 3 only indicates time radiation assembly 301～304), radiation assembly all has the outward appearance of isosceles triangle each time, and all times radiation component specifications in first radiation assembly 322 goes out an isoceles triangle shape border 331.The summit on isosceles triangle border 331 is coupled to the signal feed side 321a in the signal feed-in line group 321, and the base on isosceles triangle border 331 is second side of first radiation assembly 322.
Similarly, second radiation assembly 323 comprises a plurality of radiation assemblies (Fig. 3 only indicates time radiation assembly 305～308), radiation assembly all has the outward appearance of isosceles triangle each time, and all times radiation component specifications in second radiation assembly 323 goes out an isoceles triangle shape border 332.The summit on isosceles triangle border 332 is coupled to the signal feed side 321b in the signal feed-in line group 321, and the base on isosceles triangle border 332 is second side of second radiation assembly 323.
Outward appearance from first radiation assembly 322 and second radiation assembly 323, the height of fractal dipole aerial 320 is the distance of second side of second side to the second radiation assembly 323 of first radiation assembly 322, and the width of fractal dipole aerial 320 is the width of second side of first radiation assembly 322.Yet from another viewpoint, the height of fractal dipole aerial 320 is the distance on the base on isosceles triangle border 331 to the base on isosceles triangle border 332, and the width of fractal dipole aerial 320 is the base width on isosceles triangle border 331.
What deserves to be mentioned is that though the fractal structure of fractal dipole aerial having been contained has been drawn a possible kenel, the insider should know that different differentiation modes forms differentiation the inferior radiation assembly of different outward appearances in Fig. 3 embodiment.In other words, so long as have fractal structure and meet the fractal dipole aerial of optimization size of the present invention, be to have met spiritual place of the present invention just.
In sum, the present invention carries out design optimization by the height and the width to fractal dipole aerial, for example carry out the design optimization of fractal dipole aerial with the half-wavelength of electromagnetic signal, or with the imaginary impedance value of the half-wavelength of electromagnetic signal collocation label chip, carry out the design optimization of fractal dipole aerial, and then reach good impedance match and microminiaturized purpose between plate aerial and the label chip, and effectively promote the decipherment distance that radio-frequency recognition system is contained.
Though the present invention with preferred embodiment openly as above; right its is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is when looking being as the criterion that the accompanying Claim book defined.
Claims (14)
1. the plate aerial of a RFID tag, in order to receive and dispatch an electromagnetic signal, this plate aerial comprises:
One dielectric-slab; And
One fractal dipole aerial, be configured on the surface of this dielectric-slab, the height of this fractal dipole aerial is 0.3～0.7 times of half-wavelength of this electromagnetic signal, and the width of this fractal dipole aerial is 0.7～1.1 times of half-wavelength of this electromagnetic signal, and this fractal dipole aerial comprises:
One first radiation assembly has a fractal structure;
One second radiation assembly has this fractal structure, and this fractal structure comprises an isoceles triangle shape border; And
One signal feed-in line group, in order to the transmission signal,
Wherein first side of this first radiation assembly is coupled to this signal feed-in line group, and first side of this second radiation assembly is coupled to this signal feed-in line group, and this second radiation assembly and this first radiation assembly be symmetrical in the both sides of this signal feed-in line group,
Wherein the summit on this isoceles triangle shape border is coupled to this signal feed-in line group, and the base on this isoceles triangle shape border is second side of this first radiation assembly or second side of this second radiation assembly,
Wherein the height of this fractal dipole aerial is the distance of second side of this first radiation assembly to second side of this second radiation assembly, and the width of this fractal dipole aerial is the width of second side of this first radiation assembly.
2. the plate aerial of RFID tag according to claim 1 is characterized in that, this signal feed-in line group, this first radiation assembly and this second radiation assembly are positioned at the same surface of this dielectric-slab.
3. the plate aerial of RFID tag according to claim 1 is characterized in that, this dielectric-slab is a printed circuit board (PCB).
4. the plate aerial of RFID tag according to claim 1 is characterized in that, this dielectric-slab is a paper.
5. the plate aerial of RFID tag according to claim 1 is characterized in that, this fractal dipole aerial is a conductor.
6. the plate aerial of RFID tag according to claim 5 is characterized in that, this conductor comprises a metallic conductor and an electrically conductive ink.
7. the plate aerial of a RFID tag is applicable to a label chip to receive and dispatch an electromagnetic signal, and this plate aerial comprises:
One dielectric-slab; And
One fractal dipole aerial, be configured on the surface of this dielectric-slab, the height of this fractal dipole aerial is 0.3～0.7 times of half-wavelength of this electromagnetic signal, the width of this fractal dipole aerial is 1～2 times of imaginary impedance value of this label chip, the unit of above-mentioned width is a millimeter, and this fractal dipole aerial comprises:
One first radiation assembly has a fractal structure;
One second radiation assembly has this fractal structure, and wherein this fractal structure comprises an isoceles triangle shape border; And
One signal feed-in line group, in order to the transmission signal,
Wherein first side of this first radiation assembly is coupled to this signal feed-in line group, and first side of this second radiation assembly is coupled to this signal feed-in line group, and this second radiation assembly and this first radiation assembly be symmetrical in the both sides of this signal feed-in line group,
Wherein the summit on this isoceles triangle shape border is coupled to this signal feed-in line group, and the base on this isoceles triangle shape border is second side of this first radiation assembly or second side of this second radiation assembly,
Wherein the height of this fractal dipole aerial is the distance of second side of this first radiation assembly to second side of this second radiation assembly, and the width of this fractal dipole aerial is the width of second side of this first radiation assembly.
8. the plate aerial of RFID tag according to claim 7 is characterized in that, this signal feed-in line group, this first radiation assembly and this second radiation assembly are positioned at the same surface of this dielectric-slab.
9. the plate aerial of RFID tag according to claim 7 is characterized in that, this dielectric-slab is a printed circuit board (PCB).
10. the plate aerial of RFID tag according to claim 7 is characterized in that, this dielectric-slab is a paper.
11. the plate aerial of RFID tag according to claim 7 is characterized in that, this fractal dipole aerial is a conductor.
12. the plate aerial of RFID tag according to claim 11 is characterized in that, this conductor comprises a metallic conductor and an electrically conductive ink.
13. the plate aerial of a RFID tag, in order to receive and dispatch an electromagnetic signal, this plate aerial comprises:
One dielectric-slab; And
One fractal dipole aerial is configured on the surface of this dielectric-slab, and the height of this fractal dipole aerial is 0.3～0.7 times of half-wavelength of this electromagnetic signal, and the width of this fractal dipole aerial is 0.7～1.1 times of half-wavelength of this electromagnetic signal;
Wherein this fractal dipole aerial comprises one first isosceles triangle border and one second isosceles triangle border, the height of this fractal dipole aerial is the distance on the base on this first isosceles triangle border to the base on this second isosceles triangle border, and the width of this fractal dipole aerial is the base width on this first isosceles triangle border.
14. the plate aerial of a RFID tag is applicable to a label chip to receive and dispatch an electromagnetic signal, this plate aerial comprises:
One dielectric-slab; And
One fractal dipole aerial, be configured on the surface of this dielectric-slab, the height of this fractal dipole aerial is 0.3～0.7 times of half-wavelength of this electromagnetic signal, and the width of this fractal dipole aerial is 1～2 times of imaginary impedance value of this label chip, and the unit of above-mentioned width is a millimeter;
Wherein this fractal dipole aerial comprises one first isosceles triangle border and one second isosceles triangle border, the height of this fractal dipole aerial is the distance on the base on this first isosceles triangle border to the base on this second isosceles triangle border, and the width of this fractal dipole aerial is the base width on this first isosceles triangle border.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006101056442A CN101110494B (en) | 2006-07-17 | 2006-07-17 | Flat plate antenna of radio frequency identification tag |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006101056442A CN101110494B (en) | 2006-07-17 | 2006-07-17 | Flat plate antenna of radio frequency identification tag |
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| CN101110494A CN101110494A (en) | 2008-01-23 |
| CN101110494B true CN101110494B (en) | 2011-12-07 |
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| CN2006101056442A Expired - Fee Related CN101110494B (en) | 2006-07-17 | 2006-07-17 | Flat plate antenna of radio frequency identification tag |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103367886B (en) * | 2012-03-30 | 2017-06-13 | 刘智佳 | A kind of ultrahigh-frequency tag antenna based on Fractal process |
| CN103594783B (en) * | 2012-12-28 | 2015-04-08 | 中国科学院电子学研究所 | Ultra wide band triangle plane resistive film antenna |
| CN104078751A (en) * | 2014-06-11 | 2014-10-01 | 西安电子科技大学 | Directional dual-frequency base station antenna |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1264932A (en) * | 1999-02-01 | 2000-08-30 | 超传感器（私有）有限公司 | Mixed antenna device used for electronic discriminating system |
| CN1489806A (en) * | 2000-12-18 | 2004-04-14 | ������������ʽ���� | Antenna for RFID |
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2006
- 2006-07-17 CN CN2006101056442A patent/CN101110494B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1264932A (en) * | 1999-02-01 | 2000-08-30 | 超传感器（私有）有限公司 | Mixed antenna device used for electronic discriminating system |
| CN1489806A (en) * | 2000-12-18 | 2004-04-14 | ������������ʽ���� | Antenna for RFID |
Non-Patent Citations (1)
| Title |
|---|
| C.PUENTE.Variations on the Fractal Sierpinski Antenna Flare Angle.《Antennas and Propagation Society International Symposium,1998,IEEE》.1998,2340-2343. * |
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