CN103177284A - RFID tag with variable operating frequency band - Google Patents
RFID tag with variable operating frequency band Download PDFInfo
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- CN103177284A CN103177284A CN2012104107475A CN201210410747A CN103177284A CN 103177284 A CN103177284 A CN 103177284A CN 2012104107475 A CN2012104107475 A CN 2012104107475A CN 201210410747 A CN201210410747 A CN 201210410747A CN 103177284 A CN103177284 A CN 103177284A
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Abstract
The invention relates to an RFID label with variable operation frequency band, comprising: a dielectric layer having a first side and a second side opposite to each other; a first conductive part arranged on the first side surface; two second conductive parts, which are arranged on the second side surface at intervals, and two opposite openings are formed between the second conductive parts; a plurality of connection structures electrically connecting the second conductive portions and the first conductive portion; an RFID unit connected to the second conductive parts; and at least one capacitive load structure disposed on the second side surface such that at least one opening is located between the at least one capacitive load structure, the at least one capacitive load structure not being electrically connected to the second conductive portions. Therefore, the RFID tag can be operated and used in a specific frequency band, so that the manufacturing cost of the tag and the inventory pressure of products can be reduced, the RFID tag is suitable for metal objects, meets the application requirements of the global UHF RFID frequency band, and can improve the reading distance of the RFID tag.
Description
Technical field
The present invention relates to the RFID label of a kind of RFID label, particularly a kind of variable operation frequency range.
Background technology
RFID (Radio Frequency Identification) technology has rewritable, can store more information, need not namely to can read, can read simultaneously a plurality of identifying informations under direct-view, reading speed is fast and easily be automated the characteristic such as operation, make it be widely used in logistics, and be applied to gradually on other various industries, be used for accelerating to the tracking of product with promote its efficiency of management, the research that makes the RFID technology has breakthrough development in recent years with being applied in.
A complete rfid system is to be combined by three parts: (1) RFID label (tag) is mainly assembled through special packaging technology by chip (chip) and the antenna (antenna) that can store information; (2) RFID reader (reader), it is made of antenna and RFID reader module; (3) application program (application).
The RFID technology is on using, because the RFID label is directly to be attached on commodity, often run into situation about much can not expect in the use and cause system can't read identifying information in the RFID label, such as: the commodity that commodity are overlapping, commodity, the content of metal material packing be liquid state etc.; Also just because of this, the designing technique of label antenna is the key that success or failure are used in impact, reason comprises: the design of antenna determines the height of cost, the size that can operate frequency range, the quality of performance, object applicatory etc., therefore design suitable many of subject under discussion De Qi Publications deliver in recent years relevant for the RFID label antenna, the Patent Case quantity of applying for is also very considerable; Relative, commercially available RFID label product is also suitable many, such as: general carton with RFID label, glass with RFID label and metal dedicated RF ID label etc.
The exploitation of each RFID label has its technical difficulty to exist with design, the tool challenge of the exploitation of the RFID label of wherein using with metal again.Its main cause is that metal can be considered good conductor, be a perfect reflecting surface for electromagnetic wave, when therefore general purpose RFID label being attached at metal sheet surface, will be because of destruction interference, cause the antenna near sheet metal effectively to receive and emitting electromagnetic wave, make the distance that effectively reads of RFID label be reduced in 1～2 centimeter by several meters, even complete failure.Yet, for the RFID technology is applied on metal, as: motor vehicle assembly, counter, commercial unit etc., manufacturer also develops the RFID label to the metal special use, yet the operated frequency range of this type of label is narrower, can't contain simultaneously the operation frequency range that covers global UHF rfid system: 860～960MHz, therefore need the application demand for the different operating frequency range, design the RFID label applicable to this frequency range, thereby increase manufacturing cost and warehousing pressure.Therefore how only to design a metal RFID label, but can satisfy simultaneously the demand of global different operating frequency range, be still many direction and targets of making great efforts.
In the design of metal with the RFID label antenna, except the frequency range problem need solve, because the characteristic impedance of RFID chip is not pure resistive, but have simultaneously resistive and capacitive complex impedance characteristic, therefore be different from design the design of 50 traditional ohm antennas, for allowing the Energy Transfer between RFID chip and antenna reach optimization, how to provide be easier to, effectively mechanism is adjusted in impedance, with design can with the RFID label antenna of chip characteristics impedance conjugate impedance match, be equally also another difficult problem that faces in RFID label antenna design.
Take No. the I267788th, TaiWan, China patent announcement as example, this patent proposes with the designed metal that the forms RFID label antenna of surrounding metallic cover structure, to realize the design of metal use RFID label antenna.Announce the label antenna of No. I267788 except the narrow problem of frequency range, its impedance operator depends on that fully surrounding coats the total length in loop, and the loop total length depends on required imaginary impedance value size fully, therefore should invention be short of more adjustable degree of freedom on antenna impedance is adjusted, and it is less that the width of designed label antenna is out penetrated gain, namely effectively read distance shorter, space in practical therefore still has greatly improved.
Disclosed technology in the TaiWan, China patent discloses No. 200919327, with the designed metal that the forms RFID label antenna of two dried mushroom shape structures, the impedance operator of its structure can be come adjusted design by the size of the distance between syndeton pore size, two syndetons and top two conduction rectangular sheets, adjusts on degree of freedom in impedance to be improved; But with the designed label antenna that forms of this structure, but suitable narrow of its operation frequency range, can't contain the operation frequency range that covers global UHF RFID, thus still can increase manufacturing cost and warehousing pressure on volume production, and this label construction exists width to penetrate the little shorter problem of distance that reads of gain equally.
Therefore, be necessary to provide the RFID label of the variable operation frequency range of an innovation and tool progressive, to address the above problem.
Summary of the invention
The invention provides a kind of RFID label of variable operation frequency range, comprising: a dielectric layer has one first relative side and one second side; One first conductive part is arranged at this first side; 2 second conductive parts are arranged at this second side at each interval, are formed with two relative openings between these second conductive parts; A plurality of syndetons are electrically connected these second conductive parts and this first conductive part; One RFID unit connects these the second conductive parts; And at least one capacitive load structure, be arranged at this second side, make at least one opening between this at least one capacitive load structure, this at least one capacitive load structure is not electrically connected these the second conductive parts.
The present invention proposes a kind of RFID label of variable operation frequency range, it can allow the user can comply with required operation frequency range demand, by the openings of sizes between syndeton quantity and spacing, the second conductive part or the adjustment of capacitive load structure, to obtain required complex impedance value, so can allow the RFID label operate use in special frequency channel, do not need to redesign again another label antenna, therefore can reduce label manufacturing cost and product inventory pressure.And RFID label of the present invention is applicable on metal, and can satisfy the application demand of global UHF RFID frequency range.
Moreover, on the label antenna impedance is adjusted, the structural design of RFID label of the present invention provides more adjustment degree of freedom, and because the adjustment elasticity of impedance is large, allow the deviser under the restriction of specific imaginary impedance value demand, still can design the label antenna of large-size, thus can be easy to realize having the label antenna of more significantly penetrating gain, and then improve the distance that reads of RFID label.
Description of drawings
The schematic diagram of the RFID label of the variable operation frequency range of Fig. 1 a, Fig. 2 a, the direct feed-in mode of Fig. 3 a, Fig. 4 a demonstration chip of the present invention;
The schematic diagram of the RFID label of the variable operation frequency range of Fig. 1 b, Fig. 2 b, Fig. 3 b, Fig. 4 b demonstration antenna indirect coupling feed-in mode of the present invention;
Fig. 5 shows the schematic diagram of the RFID label each several part dimensioning of Fig. 1 a;
Fig. 6 (a) shows the circuit model of the RFID label of variable operation frequency range of the present invention;
Fig. 6 (b) shows the equivalent-circuit model of the circuit model of Fig. 6 (a);
Fig. 7 shows that the present invention adopts respectively the resonant frequency performance plot of 2,3 and 4 pairs of resulting RFID labels of syndeton;
Fig. 8 shows the graph of a relation between syndeton spacing of the present invention and antenna resonance frequency;
Fig. 9 shows the openings of sizes of RFID label of the present invention and the graph of a relation between antenna resonance frequency;
Figure 10 shows in RFID label of the present invention and has or not when adding the capacitive load structure, and both are subjected to the comparison diagram of metal disturbing effect;
Figure 11 shows that RFID label of the present invention has the capacitive load structure of different length and the graph of a relation between antenna resonance frequency; And
Figure 12 shows that RFID label of the present invention is at the graph of a relation of three kinds of operation frequency ranges and reflective power.
[main element symbol description]
The RFID label of 1 variable operation frequency range of the present invention
11 dielectric layers
12 first conductive parts
13 second conductive parts
The 14RFID unit
15 syndetons
16 capacitive load structures
17 openings
111 first sides
112 second sides
131 corner cut sections
132 extensions
133 first variable operation frequency range indexs
The 141RFID chip
142 lappets
151 second variable operation frequency range indexs
161 the 3rd variable operation frequency range indexs
Embodiment
The schematic diagram of the RFID label of the variable operation frequency range of Fig. 1 a, 2a, the direct feed-in mode of 3a, 4a demonstration chip of the present invention; The schematic diagram of the RFID label of the variable operation frequency range of Fig. 1 b, 2b, 3b, 4b demonstration antenna indirect coupling feed-in mode of the present invention; Fig. 5 shows the schematic diagram of the RFID label each several part dimensioning of Fig. 1 a.
With reference to figure 1a and Fig. 5, the RFID label 1 of this variable operation frequency range comprises: a dielectric layer 11, one first conductive part 12,2 second conductive parts 13, a RFID unit 14, a plurality of syndeton 15 and at least one capacitive load structure 16.
This dielectric layer 11 has one first relative side 111 and one second side 112.This dielectric material 11 can be PET or PI material.This first conductive part 12 is arranged at this first side 111.These second conductive parts 13 are arranged at this second side 112 at each interval, and 13 of these second conductive parts are formed with two relative openings 17.In the present embodiment, each second conductive part 13 has two corner cut sections 131, and the corresponding corner cut section 131 of these the second conductive parts 13 forms relative these openings 17 (these second conductive parts 13 roughly are a butterfly (bowtie shape) conductive part).The antenna impedance of the RFID label 1 of this variable operation frequency range can be by the openings of sizes of these openings 17 adjusted design in addition, to obtain required complex impedance value.
In one embodiment of this invention, each second conductive part 13 can also comprise at least one extension 132, these extensions 132 relatively extend and form a fourchette shape capacitance structure, and this fourchette shape capacitance structure is between relative capacitive load structure 16 and opening 17 (as shown in Fig. 2 a, 2b).Preferably, each extension 132 can also comprise one first variable operation frequency range index 133, this the first variable operation frequency range index 133 comprises that at least one change operation frequency range index is (shown in Fig. 2 a, the choosing of 2b dotted line circle, the operating frequency of RFID labels 1 after the signable corresponding extension 132 of each dotted line circle choosing place cuts off, such as: 918,922,950,960MHz etc.).The antenna impedance of the RFID label 1 of this variable operation frequency range can be come adjusted design in addition by the different off-position of these extensions 132, to obtain required complex impedance value.
These syndeton 15 these second conductive parts 13 of electrical connection and this first conductive parts 12.By these syndeton 15 these second conductive parts 13 of electrical connection and this first conductive parts 12, form one and have the structure of many loops parallel connection.Wherein, these syndetons 15 can be in pairs or do not arrange in pairs.Preferably, these syndetons 15 can also comprise at least one the second variable operation frequency range index 151, this the second variable operation frequency range index 151 comprises that at least one change operation frequency range index is (shown in Fig. 3 a, the choosing of 3b dotted line circle, after the electric connecting member of the signable corresponding syndeton 15 of each dotted line circle choosing place and the second conductive part 13 cuts off, the operating frequency of RFID label 1, such as: 920,925,930,935MHz etc.).
Will be understood that, the structure that the electric connecting mode of corresponding syndeton 15 and the second conductive part 13 also can be as shown in Fig. 4 a, 4b, but not as limit.The antenna impedance of the RFID label 1 of this variable operation frequency range can be by in pairs or not configuration in pairs these syndetons 15 adjusted design in addition, to obtain required complex impedance value.
This RFID unit 14 connects these second conductive parts 13.In the embodiment of the RFID label 1 of the variable operation frequency range of the direct feed-in mode of the chip as shown in Fig. 1 a, 2a, 3a or 4a, this RFID unit 14 comprises a RFID chip 141, these RFID chip 141 these second conductive parts 13 of electrical connection.
In the embodiment of the RFID label 1 of the variable operation frequency range of the antenna indirect coupling feed-in mode as shown in Fig. 1 b, 2b, 3b or 4b, this RFID unit 14 comprises a RFID chip 141 and two lappets (tab) 142, these lappets 142 connect relative two ends of this RFID chip 141, and these lappets 142 are arranged at respectively these the second conductive part 13 top relative positions and are not electrically connected these the second conductive parts 13.
With reference to figure 1a and Fig. 5, this at least one capacitive load structure 16 is arranged at this second side 112 again, makes at least one opening 17 between this at least one capacitive load structure 16, and this at least one capacitive load structure 16 is not electrically connected these the second conductive parts 13.Preferably, each capacitive load structure 16 also comprises one the 3rd variable operation frequency range index 161, the 3rd variable operation frequency range index 161 comprises that at least one change operation frequency range index is (shown in Fig. 1 a, the choosing of 1b dotted line circle, the operating frequency of RFID label 1 after the signable corresponding capacitance support structures 16 of each dotted line circle choosing place cuts off, for example: the operating frequency when capacitive load structure 16 is not cut off is 880MHz, the operating frequency that cuts off after a capacitive load structure 16 wherein is 905MHz, and the operating frequency that cuts off after two capacitive load structures 16 is 945MHz).The design of the length of this at least one capacitive load structure 16 and cut-out point (change operation frequency range index), allow the user can comply with required operation frequency range demand, cut off suitable cut-out point, can allow label antenna operate use in this special frequency channel (high, medium and low frequency range), do not need to redesign again another label antenna, therefore can reduce label manufacturing cost and product inventory pressure.
The circuit model of the RFID label 1 of variable operation frequency range of the present invention shown in can Fig. 6 (a) represent, and can be simplified equivalence and become the circuit model shown in Fig. 6 (b).Wherein, R
aAntenna real impedance for RFID label 1 can be expressed as R in equivalent electrical circuit
thAnd every a pair of syndeton 15 can be considered a loop in parallel, can represent with an inductance, therefore if N is arranged to syndeton 15, just can be expressed as L
Via1L
ViaN, in equivalent electrical circuit, an available variable inductance L
thRepresent; For RFID label 1, these opening 17 sizes are inversely proportional to its capacitance of contributing, an available capacitor C
gRepresent, in addition, this at least one capacitive load structure 16 also can increase its capacitive character to RFID label 1, equally also an available capacitor C
barRepresent, therefore in equivalent electrical circuit, C
gWith C
barCan be simplified to a variable capacitance C
thRepresent.Can learn from the equivalent-circuit model of Fig. 6 (b), the resonant frequency of RFID label 1 can be expressed as:
Below will illustrate with this relational expression and the impact of the parameter of explaining relevant RFID label 1 on antenna performance.
The impact of syndeton quantity
Fig. 7 (is impedance characteristic f for adopting the resonant frequency performance plot of 2,3 and 4 pairs of resulting RFID labels 1 of syndeton 15 respectively
Cvia(2), f
Cvia(3), f
Cvia(4)).Therefore can pass through this characteristic, adopt appropriate paired syndeton 15 to design the antenna of the RFID label 1 under large-size, and still can satisfy required imaginary impedance value, and the antenna of large-size can provide larger antenna gain, that is designed out RFID label 1, it effectively reads distance and can obtain significantly to promote; In addition, this mechanism also increases the one degree of freedom of this antenna structure on impedance is adjusted.
Syndeton spacing V
dImpact
Because syndeton 15 connects the first conductive part 12 and the second conductive part 13 formation one electric loops, therefore, the spacing V that syndeton is 15
dAlso can in order to the inductive of the antenna structure that regulates and controls RFID label 1, be as shown in Figure 8 the graph of a relation (V between syndeton 15 spacings and antenna resonance frequency
dBe respectively 70,65,60 ㎜, the respective impedance family curve is
).As can be known from Fig. 8: work as V
dHeal when large, its inductance value is larger, makes antenna resonance frequency f
cMove toward the low frequency direction; Otherwise, V
dMore hour, f
cMove toward high frequency direction.Therefore in RFID label 1, the spacing V that syndeton is 15
dOne of the parameter that can adjust as antenna impedance.
Openings of sizes G
1Impact
Except above-mentioned syndeton 15 quantity and spacing V
dTwo degree of freedom allow the user reach outside the inductive regulation and control of antenna structure by the design of structural parameters, separately can regulate and control the capacitive mechanism of antenna structure, and comprising: the size of opening 17 is (with parameter G
1With G
2Expression) and the design of capacitive load structure 16, all can be in order to adjust the capacitive character of antenna.Be illustrated in figure 9 as 1/2nd big or small G of the V-arrangement opening 17 of string tie shape structure (being the formed structures of these the second conductive parts 13)
1And the graph of a relation (G between antenna resonance frequency
1Be respectively 0,5,10 ㎜, the respective impedance family curve is
).As can be known from Fig. 9: as opening 17 size G
1Heal large, the interstructural capacitance C of string tie shape
gJust little, make the resonant frequency of antenna just higher; Otherwise, work as G
1Less, f
cJust more move toward low frequency.Therefore in RFID label 1, the structural parameters G of opening 17
1With G
2Also can be as the mechanism of regulation and control antenna structure impedance operator.
The impact of capacitive load structure
When RFID label 1 is applied directly to the metal object surface, it still can be subject to the impact on metal object surface, and cause the situation of frequently floating to occur, therefore in RFID label 1 of the present invention, add at least one capacitive load structure 16, to reduce metal object to the influence degree of RFID label 1 antenna, the situation of phenomenon occurs frequently to float when slowing down practical application.Have or not when adding capacitive load structure 16 for RFID label 1 as shown in figure 10, both are subjected to the comparison diagram of metal disturbing effect.As can be known from Fig. 10: the RFID label 1 with capacitive load list structure 16, can effectively suppressing approximately, the frequency of 20MHz floats phenomenon (frequently float by 45MHz and be reduced to 25MHz), this for the RFID label, can reach the purpose of stablizing RFID tag operational frequency range for the metal of narrow frequency characteristic.
From Fig. 7 to 10, can find out the adjustment mechanism about impedance, as long as will producing significantly, quantity or size change slightly change, therefore be difficult for realizing the purpose of fine setting; And the capacitive load structure 16 that adds, except the impact that can suppress metal object, also can be in order to the capacitive character of the antenna structure of finely tuning RFID label 1, that is can be in order to finely tune the resonant frequency f of antenna
c, and then reach the purpose that the antenna impedance value is finely tuned.
Be as shown in figure 11 the length (B of different capacitive load structures 16
l) and antenna resonance frequency between graph of a relation.Three groups of impedance characteristics in Figure 11
) be B
lRespectively with 40,50 and the result of 60mm gained, and the difference in resonance frequencies of every group is about 15～20MHz, therefore by to B
lThe design of length can realize the purpose of impedance fine setting easily.In addition, from Figure 11 also as can be known: work as B
lWhen longer, can increase the capacitive character of antenna structure, so the resonant frequency f of antenna
cJust move toward the low frequency direction; Otherwise, work as B
lHeal in short-term, f
cWill move toward high frequency direction.
Hereby described in detail the present invention with following example, only do not mean the present invention and only be confined to these examples and hold within disclosing.
The example explanation of the RFID label of variable operation frequency range
Above stated specification add effect and the characteristic thereof of capacitive load structure 16, separately further utilize the characteristic of this capacitive load structure 16 to realize that the metal of a variable operation frequency range is with the design of RFID label 1 at this.As previously mentioned, the length B by control capacitance support structures 16
lCan reach the purpose to the antenna impedance fine setting, this is because of B
lThe variation of length is more light and slow on the impact of antenna impedance, if make it become two sections (with reference to figure 1a, 1b) but capacitive load structure 16 is cut off from the centre, to make so the capacitive character of antenna produce a significantly minimizing, thus, the resonant frequency that makes antenna is jumped toward high frequency direction move, angle from the operation frequency range of RFID label 1, be exactly that its operation frequency range has varied between the operational zone of higher frequency band, therefore utilize this characteristic to realize the design of RFID label 1 of the metal of variable operation frequency range.
The metal of variable operation frequency range with the embodiment of RFID label 1 is for example: in the centre of two capacitive load structures 16, a point of interruption is set respectively, when if RFID label 1 will be applied to than low-frequency range, keep the connection of two points of interruption (as curve f the most left in Figure 12
c1Shown in); If when being applied to Mid Frequency, cut off one of them point of interruption, it is not connected (as the curve f in the middle of Figure 12
c2Shown in); If when being applied to higher frequency band, two points of interruption are all cut off, it is not connected (as curve f the rightest in Figure 12
c3Shown in).
The present invention proposes a kind of RFID label 1 of variable operation frequency range, and it can allow the user can comply with required operation frequency range demand, by syndeton 15 quantity and spacing V
d, opening 17 sizes of 13 of the second conductive parts or the adjustment of capacitive load structure 16, to obtain required complex impedance value, so can allow RFID label 1 operate use in special frequency channel, do not need to redesign again another label antenna, therefore can reduce label manufacturing cost and product inventory pressure.And RFID label 1 of the present invention is applicable on metal, and can satisfy the application demand of global UHF RFID frequency range.
Moreover, adjust in the antenna impedance of RFID label, the structural design of RFID label 1 of the present invention provides more adjustment degree of freedom, and because the adjustment elasticity of impedance is large, allow the deviser under the restriction of specific imaginary impedance value demand, still can design the label antenna of large-size, thus can be easy to realize having the label antenna of more significantly penetrating gain, and then improve the distance that reads of RFID label 1.
Above-described embodiment only is explanation principle of the present invention and effect thereof, and unrestricted the present invention, so those skilled in the art modify to above-described embodiment and change and still do not take off spirit of the present invention.Interest field of the present invention claim as described later is listed.
Claims (10)
1. the RFID label of a variable operation frequency range comprises:
One dielectric layer has one first relative side and one second side;
One first conductive part is arranged at this first side;
2 second conductive parts are arranged at this second side at each interval, are formed with two relative openings between described the second conductive part;
A plurality of syndetons are electrically connected described the second conductive part and this first conductive part;
One RFID unit connects described the second conductive part; And
At least one capacitive load structure is arranged at this second side, makes at least one opening between this at least one capacitive load structure, and this at least one capacitive load structure is not electrically connected described the second conductive part.
2. the RFID label of variable operation frequency range as claimed in claim 1, wherein this RFID unit comprises a RFID chip, described the second conductive part of this RFID chip electrical connection.
3. the RFID label of variable operation frequency range as claimed in claim 1, wherein this RFID unit comprises a RFID chip and two lappets, described lappet connects relative two ends of this RFID chip, and described lappet is arranged at respectively described the second conductive part top relative position and is not electrically connected described the second conductive part.
4. the RFID label of variable operation frequency range as claimed in claim 1, wherein said syndeton is for arranging in pairs in pairs or not.
5. the RFID label of variable operation frequency range as claimed in claim 1, wherein each second conductive part also comprises at least one extension, described extension relatively extends and forms a fourchette shape capacitance structure, and this fourchette shape capacitance structure is between relative capacitive load structure and opening.
6. the RFID label of variable operation frequency range as claimed in claim 5, wherein each second conductive part comprises two extensions, described extension relatively extends and forms two fourchette shape capacitance structures, and described fourchette shape capacitance structure is between relative capacitive load structure and opening.
7. the RFID label of variable operation frequency range as claimed in claim 5, wherein each extension also comprises one first variable operation frequency range index, this first variable operation frequency range index comprises at least one change operation frequency range index.
8. the RFID label of variable operation frequency range as claimed in claim 1, wherein said syndeton also comprises at least one the second variable operation frequency range index, this second variable operation frequency range index comprises at least one change operation frequency range index.
9. the RFID label of variable operation frequency range as claimed in claim 1, wherein each capacitive load structure also comprises one the 3rd variable operation frequency range index, the 3rd variable operation frequency range index comprises at least one change operation frequency range index.
10. the RFID label of variable operation frequency range as claimed in claim 1, wherein each second conductive part has two corner cut sections, and the corresponding corner cut section of described the second conductive part forms relative described opening.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100148706 | 2011-12-26 | ||
| TW100148706A TWI459302B (en) | 2011-12-26 | 2011-12-26 | Variable operation frequency of the RFID tag |
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| Publication Number | Publication Date |
|---|---|
| CN103177284A true CN103177284A (en) | 2013-06-26 |
| CN103177284B CN103177284B (en) | 2016-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210410747.5A Active CN103177284B (en) | 2011-12-26 | 2012-10-24 | RFID tag with variable operating frequency band |
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| Country | Link |
|---|---|
| CN (1) | CN103177284B (en) |
| TW (1) | TWI459302B (en) |
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| CN106022436A (en) * | 2016-05-12 | 2016-10-12 | 安徽晶太信息科技有限公司 | Butterfly transponder and production method thereof |
| CN107534210A (en) * | 2015-06-11 | 2018-01-02 | 张凯 | Plug together coupled capacitor RFID label antenna |
| CN109411864A (en) * | 2018-09-19 | 2019-03-01 | 福耀玻璃工业集团股份有限公司 | A kind of enhancing antenna for vehicle glass RFID electronic label |
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| US7372409B2 (en) * | 2006-02-21 | 2008-05-13 | Harris Corporation | Slit loaded tapered slot patch antenna |
| TWI421775B (en) * | 2010-05-28 | 2014-01-01 | China Steel Corp | Wireless identification tag with capacitive load |
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| US20070268113A1 (en) * | 2004-11-05 | 2007-11-22 | Johnson Daniel R | Detunable Rf Tags |
| CN102007502A (en) * | 2008-02-19 | 2011-04-06 | 艾利丹尼森公司 | Rfid tag with a releasable coupler |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107534210A (en) * | 2015-06-11 | 2018-01-02 | 张凯 | Plug together coupled capacitor RFID label antenna |
| CN107534210B (en) * | 2015-06-11 | 2020-10-27 | 江苏科睿坦电子科技有限公司 | Plug coupling capacitor RFID tag antenna |
| CN106022436A (en) * | 2016-05-12 | 2016-10-12 | 安徽晶太信息科技有限公司 | Butterfly transponder and production method thereof |
| CN109411864A (en) * | 2018-09-19 | 2019-03-01 | 福耀玻璃工业集团股份有限公司 | A kind of enhancing antenna for vehicle glass RFID electronic label |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI459302B (en) | 2014-11-01 |
| TW201327408A (en) | 2013-07-01 |
| CN103177284B (en) | 2016-04-13 |
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