CN102682329A - Radio frequency identification tag with capacitive load - Google Patents
Radio frequency identification tag with capacitive load Download PDFInfo
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- CN102682329A CN102682329A CN2011100616541A CN201110061654A CN102682329A CN 102682329 A CN102682329 A CN 102682329A CN 2011100616541 A CN2011100616541 A CN 2011100616541A CN 201110061654 A CN201110061654 A CN 201110061654A CN 102682329 A CN102682329 A CN 102682329A
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- sheet metal
- rfid tag
- capacitive load
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Abstract
The invention relates to a radio frequency identification tag with a capacitive load. The radio frequency identification tag comprises an antenna unit, the capacitive load and a radio frequency identification device. The antenna unit comprises two metal sheets and a conducting substrate, wherein the metal sheets are located the opposite position above the conducting substrate and are in electric connection with the conducting substrate. The capacitive load is in electric connection with the metal sheets. The radio frequency identification device carries out feed-in to the antenna unit by being in electric connection with the metal sheets or in a coupled mode. Accordingly, the operation frequency can be greatly lowered, high impedance of an imaginary part is obtained under the same size of the antenna unit so as to reduce the size of the radio frequency identification tag, and the radio frequency identification tag has the advantages that the radio frequency identification tag is light in weight and easy to manufacture, and adjusting elasticity of a follow-up structure is large.
Description
Technical field
The present invention relates to a kind of RF identification (RFID) label, particularly relate to a kind of RFID tag with capacitive load.
Background technology
RFID tag is directly to be attached on the commodity, so can suffer from many problems in the use.In known technology, cause system can't read the recognition data in the RFID label, as: commodity, the content of metal material packing is the commodity of liquid state etc.; The particularly application on the metal; Because metal can be considered good conductor, for electromagnetic wave, is perfect reflecting surface, when therefore the RFID label being attached at metal object; Often cause the interference of signal; Feasible antenna near metal object can't effectively receive and launching electromagnetic wave, and cause system effectively to read distance and be reduced in the l-2 centimetre by several meters, even complete failure.
For the RFID technology is applied on the metal; As: motor vehicle assembly, counter, commercial unit etc.; Also have in the known technology and develop the special-purpose RFID label of metal; Therefore but the volume of known RFID label is excessive, with high costs, develops small size, the RFID label of Special Metal cheaply, is still the known technology target that is beyond one's reach.
In addition, the development of RFID technology recently strides forward towards the direction of product orientation (item-level) one by one gradually, and this makes the trends of design demand of miniaturization more of RFID label.In the RFID of known product orientation one by one label design; It is main so that required inductive impedance (inductive reactance) to be provided; And the length in current return path is depended in this inductive design fully, therefore is subject to the restriction of physical characteristics, design the label antenna of high inductance; Just relative bigger of its size then is so be difficult for realizing the requirement of downsizing again.
Therefore, be necessary to provide the RFID tag with capacitive load of innovation and progressive, to address the above problem.
Summary of the invention
The present invention provides a kind of RF identification (RFID) label with capacitive load, comprising: antenna element, capacitive load and rfid device.This antenna element comprises two sheet metals and electrically-conductive backing plate, and these two sheet metals are positioned at the top relative position of this electrically-conductive backing plate and are electrically connected this electrically-conductive backing plate.This capacitive load is electrically connected these two sheet metals.This rfid device carries out feed-in with the mode that is electrically connected these two sheet metals or coupling to this antenna element.
RFID tag with capacitive load of the present invention can significantly reduce operating frequency; Therefore can be under the same antenna unit size; Obtain higher imaginary impedance, dwindling the size of RFID tag, and have in light weight, make the easy and big effect of follow-up structural adjustment elasticity.
Description of drawings
Fig. 1 illustrates the synoptic diagram of first embodiment of RF identification (RFID) label with capacitive load of the present invention;
Fig. 2 to 7 illustrates the synoptic diagram of five kinds of different patterns of the RFID tag with capacitive load of first embodiment of the invention;
Fig. 8 illustrates the synoptic diagram of second embodiment of the RFID tag with capacitive load of the present invention;
Fig. 9 illustrates the impedance operator of RFID tag and the figure of operating frequency; And
Figure 10 illustrates the have RFID tag of capacitive load and the impedance operator comparison diagram that does not have the RFID tag of capacitive load of the present invention.
Embodiment
Fig. 1 (a)-1 (c) and 1 (a')-1 (c') illustrate the synoptic diagram of two kinds of patterns of first embodiment of RF identification (RFID) label with capacitive load of the present invention respectively.Wherein, Fig. 1 (a) and 1 (a') are vertical view; Fig. 1 (b) and 1 (b') are front view; Fig. 1 (c) and 1 (c') are right side view.In following each figure, equally and (a') indicate vertical view, (b) and (b') indicate front view, (c) and (c') indicate right side view with (a).
With reference to figure 1 (a)-1 (c), in the present embodiment, this RFID tag 1 with capacitive load comprises: antenna element 11, capacitive load 12 and rfid device 13.This antenna element 11 comprises two sheet metals 111 and electrically-conductive backing plate 112, and these two sheet metals 111 are positioned at the top relative position of this electrically-conductive backing plate 112 and are electrically connected this electrically-conductive backing plate 112.
In the present embodiment, this antenna element 11 comprises two conductive parts 113 in addition, and this conductive part 113 is electrically connected this sheet metal 111 and this electrically-conductive backing plate 112 respectively.This conductive part 113 can be conductive pole or conducting strip.Each sheet metal 111 comprises relative first side 114 and second side 115, and the first side 114 of this sheet metal 111 is approaching and relative, makes this sheet metal 111 keep at a certain distance away.
In the present embodiment, this conductive part 113 is a conductive pole, and this conductive pole is (with reference to figure 1 (b) and 1 (c)) respectively near the second side 115 of this sheet metal 111 and between this sheet metal 111 and this electrically-conductive backing plate 112.In other was used, this conductive part 113 can be conducting strip, and this conducting strip is electrically connected the second side 115 of this sheet metal 111 and the relative dual side-edge of this electrically-conductive backing plate 112 (with reference to figure 1 (b') and 1 (c')) respectively.
In the present embodiment, this capacitive load 12 is crossed over this first side 114 and is electrically connected this sheet metal 111, and this rfid device 13 is crossed over this first side 114 and is electrically connected this sheet metal 111.Be noted that; In other is used; This rfid device 13 can comprise RF identification chip 131 and metal tape 132; Two ends of this metal tape 132 connect two ends of this RF identification chip 131 to form loop structure, and this rfid device 13 is arranged in 111 formed recesses 110 of this sheet metal, with the mode of coupling this antenna element 11 is carried out feed-in (as shown in Figure 2).
Perhaps; This rfid device 13 can comprise RF identification chip 133 and two flank sheet metals 134 in addition; This two flanks sheet metal 134 is arranged at the surface of dielectric pads material 14; This RF identification chip 133 is electrically connected these two flanks sheet metals 134, and this rfid device 13 is this dielectric pads materials 14 and be positioned at the top relative position of this sheet metal 111 at interval, with the mode of coupling this antenna element 11 are carried out feed-in (as shown in Figure 3).
In Fig. 1 (a)-1 (c), this capacitive load 12 is SMD (surface mount device, a Surface Mount Device) capacitor assembly.Be noted that this capacitive load 12 can comprise load dielectric material 121 and metal level 122, this load dielectric material 121 is arranged between this sheet metal 111 and this metal level 122 (as shown in Figure 4).
Perhaps; This capacitive load 12 can comprise four first Extendible flakes 123 in addition; Each first Extendible flake 123 is at the 3rd side 116 that connects sheet metal 111 near 114 places, first side, and court extends and parallel in fact the 3rd side 116 near second side 115 directions.Wherein, relative two the 3rd sides 116 of each sheet metal 111 are between first side 114 and second side 115 (as shown in Figure 5).Each first Extendible flake 123 produces capacitive load with the part metals sheet that is positioned at the 3rd side 116 111.
Perhaps; This capacitive load 12 can comprise two second Extendible flakes 124 in addition; This second Extendible flake 124 is positioned at phase the same side of this sheet metal 111; Each second Extendible flake 124 is at the 3rd side 116 that connects sheet metal 111 near 114 places, first side, and parallel in fact the 3rd side 116 ground extend to the second side 115 near opposite side again towards extending the court of turning back again near second side 115 directions near the extension of first side 114 directions.These second Extendible flake, 124 extensions are staggered to form fourchette structure (as shown in Figure 6).
Perhaps; This capacitive load 12 can comprise two second Extendible flakes 124 and two the 3rd Extendible flakes 125; The 3rd Extendible flake 125 and this second Extendible flake 124 are arranged at relative two sides of this sheet metal 111; Each the 3rd Extendible flake 125 is at the 3rd side 116 that connects sheet metal 111 near 114 places, first side, and parallel in fact the 3rd side 116 ground extend to the second side 115 near opposite side again towards extending the court of turning back again near second side 115 directions near the extension of first side 114 directions.This second Extendible flake 124 and 125 each extension of the 3rd Extendible flake are staggered to form fourchette structure (as shown in Figure 7).
With reference to figure 8 (a)-8 (c) and 8 (a')-8 (c'), it illustrates the synoptic diagram of two kinds of patterns of second embodiment of the RFID tag with capacitive load of the present invention respectively.The RFID tag with capacitive load 1 (Fig. 7) of the RFID tag with capacitive load 2 of present embodiment and first embodiment is roughly the same, and its difference is in the structure of antenna element 21.In the present embodiment; This antenna element 21 comprises at least one substrate metal layer 211 and substrate dielectric material 212 in addition; This at least one substrate metal layer 211 is arranged between this sheet metal 111 and this electrically-conductive backing plate 112, and this substrate dielectric material 212 is arranged between this at least one substrate metal layer 211 and this sheet metal 111 and between this at least one substrate metal layer 211 and this electrically-conductive backing plate 112.The RFID tag with capacitive load 1 (Fig. 7) same section of other and first embodiment is with the same components symbolic representation, and no longer gives unnecessary details at this.
Will be understood that the conductive part 213 of this antenna element 21 can be conductive pole or conducting strip.This antenna element 21 also can comprise the structure like Fig. 4, any capacitive load 12 shown in 5 or 6 in addition.
Fig. 9 (a) illustrates the impedance operator figure of RFID tag; Fig. 9 (b) illustrates the operating frequency figure of RFID tag.In Fig. 9 (a), the operating frequency of RFID tag drops on F
CAnt(about 1500MHz); In Fig. 9 (b), the object run frequency of RFID tag drops on F
CTag(about 930MHz).RFID tag with capacitive load of the present invention has capacitive load, can its operating frequency significantly be reduced, and makes its operating frequency drop on object run frequency F
CTag
With reference to Figure 10, it illustrates the have RFID tag of capacitive load and the impedance operator comparison diagram that does not have the RFID tag of capacitive load of the present invention.Wherein, dotted line L1 is the real impedance curve with RFID tag of capacitive load of the present invention, and solid line L2 is the real impedance curve with RFID tag of capacitive load of the present invention; Dotted line L3 is the real impedance curve that does not have the RFID tag of capacitive load, and solid line L4 is the real impedance curve that does not have the RFID tag of capacitive load.
The imaginary impedance that Figure 10 illustrates the RFID tag with capacitive load is about 1000 Ω, its operating frequency F
CAntDrop on about 1900MHz; Figure 10 illustrates the imaginary impedance with RFID tag of capacitive load of the present invention and is increased to and is about 1200 Ω, and its operating frequency F
CAnt_cSignificantly be reduced to about 980MHz.In addition, relatively dotted line L1 and dotted line L3 can know that the real impedance with RFID tag of capacitive load of the present invention also is higher than the real impedance of the RFID tag with capacitive load.
In sum; RFID tag with capacitive load of the present invention can significantly reduce operating frequency really; Therefore can be under the same antenna unit size; Obtain higher imaginary impedance, dwindling the size of RFID tag, and have in light weight, make (can directly produce in a large number) and the big effect of follow-up structural adjustment elasticity easily with the PCB processing procedure.
The foregoing description is merely explanation principle of the present invention and effect thereof, and unrestricted the present invention, and therefore Given this those skilled in the art make amendment to the foregoing description and change and still do not take off spirit of the present invention.Interest field of the present invention should be limited the claim of enclosing.
Reference numeral
The RFID tag with capacitive load of 1 first embodiment of the present invention
The RFID tag with capacitive load of 2 second embodiment of the present invention
11 antenna elements
12 capacitive loads
13 rfid devices
14 dielectric pads materials
21 antenna elements
110 recesses
111 sheet metals
112 electrically-conductive backing plates
113 conductive parts
114 first sides
115 second sides
116 the 3rd sides
121 load dielectric materials
122 metal levels
123 first Extendible flakes
124 second Extendible flakes
125 the 3rd Extendible flakes
131 RF identification chips
132 metal tapes
133 RF identification chips
134 flank sheet metals
211 substrate metal layers
212 substrate dielectric materials
213 conductive parts
Claims (15)
1. RF identification (RFID) label with capacitive load comprises:
Antenna element comprises two sheet metals and electrically-conductive backing plate, and this sheet metal is positioned at the top relative position of this electrically-conductive backing plate and is electrically connected this electrically-conductive backing plate;
Capacitive load is electrically connected this sheet metal; And
Rfid device carries out feed-in with the mode that is electrically connected this sheet metal or coupling to this antenna element.
2. RFID tag as claimed in claim 1, wherein this antenna element comprises two conductive parts in addition, is electrically connected this sheet metal and this electrically-conductive backing plate respectively.
3. RFID tag as claimed in claim 2, wherein this conductive part is conductive pole or conducting strip.
4. RFID tag as claimed in claim 3; Wherein each sheet metal comprises relative first side and second side; The first side of this sheet metal is approaching and relatively, this conductive pole is respectively near the second side of this sheet metal and between this sheet metal and this electrically-conductive backing plate.
5. RFID tag as claimed in claim 3; Wherein each sheet metal comprises relative first side and second side; The first side of this sheet metal is approaching and relatively, this conducting strip is electrically connected the second side of this sheet metal and the relative dual side-edge of this electrically-conductive backing plate respectively.
6. RFID tag as claimed in claim 1; Wherein this antenna element comprises substrate metal layer and substrate dielectric material at least in addition; This at least one substrate metal layer is arranged between this sheet metal and this electrically-conductive backing plate, and this substrate dielectric material is arranged between this at least one substrate metal layer and this sheet metal and between this at least one substrate metal layer and this electrically-conductive backing plate.
7. RFID tag as claimed in claim 1; Wherein form recess between this sheet metal; This rfid device comprises RF identification chip and metal tape in addition; Two ends that two ends of this metal tape connect this RF identification chip form loop structure, and this rfid device is arranged between this sheet metal in the formed recess, with the mode of coupling this antenna element is carried out feed-in.
8. RFID tag as claimed in claim 1; Comprise the dielectric pads material in addition; This rfid device comprises RF identification chip and two flank sheet metals in addition, and this two flanks sheet metal is arranged at the surface of this dielectric pads material, and this RF identification chip is electrically connected this two flanks sheet metal; This rfid device is this dielectric pads material and be positioned at the top relative position of this sheet metal at interval, with the mode of coupling this antenna element is carried out feed-in.
9. RFID tag as claimed in claim 1, wherein this capacitive load system is SMD (surface mount device) capacitor assembly.
10. RFID tag as claimed in claim 1, wherein this capacitive load comprises load dielectric material and metal level, and this load dielectric material is arranged between this sheet metal and this metal level.
11. RFID tag as claimed in claim 1; Wherein this capacitive load comprises four first Extendible flakes in addition; Each sheet metal comprises relative first side and second side and two the 3rd relative sides, and the first side of this sheet metal is approaching and relatively, two the 3rd sides of each sheet metal are between first side and second side; Each first Extendible flake is connecting the 3rd side near the place, first side, and towards extending and parallel in fact the 3rd side near the second side direction.
12. RFID tag as claimed in claim 1; Wherein this capacitive load comprises two second Extendible flakes in addition; Each sheet metal comprises relative first side and second side and two the 3rd relative sides, and the first side of this sheet metal is approaching and relatively, two the 3rd sides of each sheet metal are between first side and second side; This second Extendible flake is positioned at phase the same side of this sheet metal; Each second Extendible flake is connecting the 3rd side near first side place, and parallel in fact the 3rd side ground turns back towards extending near the first side direction towards extending near the second side direction again, and this second Extendible flake extension is staggered to form the fourchette structure.
13. RFID tag as claimed in claim 12; Wherein this capacitive load comprises two the 3rd Extendible flakes in addition; The 3rd Extendible flake and this second Extendible flake are arranged at relative two sides of this sheet metal; Each the 3rd Extendible flake is connecting the 3rd side near first side place, and parallel in fact the 3rd side ground turns back towards extending near the first side direction towards extending near the second side direction again, and the extension of the 3rd Extendible flake is staggered to form the fourchette structure.
14. RFID tag as claimed in claim 1, it can be applicable to the stock control of metal material product.
15. RFID tag as claimed in claim 1, it has one of them frequency range of UHF, 2.45GHz or 5.8GHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110061654.1A CN102682329B (en) | 2011-03-15 | 2011-03-15 | Radio frequency identification tag with capacitive load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110061654.1A CN102682329B (en) | 2011-03-15 | 2011-03-15 | Radio frequency identification tag with capacitive load |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102682329A true CN102682329A (en) | 2012-09-19 |
| CN102682329B CN102682329B (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110061654.1A Active CN102682329B (en) | 2011-03-15 | 2011-03-15 | Radio frequency identification tag with capacitive load |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10133430B2 (en) | 2016-05-11 | 2018-11-20 | Microsoft Technology Licensing, Llc | Encoding data in capacitive tags |
Citations (5)
| 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 |
| US6147606A (en) * | 1998-03-26 | 2000-11-14 | Intermec Ip Corp. | Apparatus and method for radio frequency transponder with improved read distance |
| US20090109034A1 (en) * | 2007-10-29 | 2009-04-30 | China Steel Corporation | Radio frequency identification tag device for metallic products |
| CN201352357Y (en) * | 2009-02-25 | 2009-11-25 | 益实实业股份有限公司 | Improved structure of wireless radio frequency identification label |
| US20110025471A1 (en) * | 2009-05-29 | 2011-02-03 | Popugaev Alexander | RFID transponder, in particular for assembly on metal and manufacturing method therefor |
-
2011
- 2011-03-15 CN CN201110061654.1A patent/CN102682329B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6147606A (en) * | 1998-03-26 | 2000-11-14 | Intermec Ip Corp. | Apparatus and method for radio frequency transponder with improved read distance |
| 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 |
| US20090109034A1 (en) * | 2007-10-29 | 2009-04-30 | China Steel Corporation | Radio frequency identification tag device for metallic products |
| CN201352357Y (en) * | 2009-02-25 | 2009-11-25 | 益实实业股份有限公司 | Improved structure of wireless radio frequency identification label |
| US20110025471A1 (en) * | 2009-05-29 | 2011-02-03 | Popugaev Alexander | RFID transponder, in particular for assembly on metal and manufacturing method therefor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10133430B2 (en) | 2016-05-11 | 2018-11-20 | Microsoft Technology Licensing, Llc | Encoding data in capacitive tags |
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| Publication number | Publication date |
|---|---|
| CN102682329B (en) | 2015-03-25 |
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