CN202997055U - Double-sided subminiature RFID tag antenna - Google Patents
Double-sided subminiature RFID tag antenna Download PDFInfo
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- CN202997055U CN202997055U CN 201220542857 CN201220542857U CN202997055U CN 202997055 U CN202997055 U CN 202997055U CN 201220542857 CN201220542857 CN 201220542857 CN 201220542857 U CN201220542857 U CN 201220542857U CN 202997055 U CN202997055 U CN 202997055U
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Abstract
The utility model discloses a double-sided subminiature RFID tag antenna, and belongs to the technical field of radio frequency identification. A PET film (or other materials) substrate is used in the tag antenna. Aluminium foils (or other good conductors) are etched on a right surface and a back surface of the substrate, and the aluminium foils (or other good conductors) are used as an antenna structure, wherein a dipole-shaped structure whose two arms are much lower than a wavelength is disposed on a surface, and a symmetrical clip-type structure is disposed on the other surface. An RFID tag chip is connected with the two arms of the dipole-shaped structure. The tag antenna can be used in UHF or microwave and other frequency ranges. In an embodiment of a typical case of using a center frequency of 915 MHz and a Monza 4 chip, a total volume of the tag antenna using the structure is just 50x5x0.05 mm<3> (0.153x0.015x0.00015[lambda]3), and the tag antenna has relatively wide operation bandwidth and omnidirectivity. Gain is -3dBi. The utility model provides a method for solving problems of further miniaturization of the tag antenna, and is especially suitable to be applied in RFID ticketing systems, access control systems, and other fields which need miniaturization and omnidirectivity of the tag antenna.
Description
Technical field
The utility model relates to a kind of radio frequency recognizing electronic label, especially microminiature, isotropic electronic tag.
Background technology
Radio-frequency (RF) identification (Radio Frequency Identification, be called for short RFID) technology is a kind ofly to carry out contactless bidirectional data communication by wireless radio frequency mode, thus the technology that target is identified.Radio-frequency recognition system is comprised of reader and electronic tag usually.Electronic tag is comprised of label chip and label antenna, carries out exchanges data by electromagnetic wave and read write line, has the functions such as intelligent read and coded communication.Label antenna is vital device in rfid system, and electromagnetic wave is launched, received to rfid system by label antenna, thereby realizes that reader is to the identification of electronic tag.
Radio-frequency recognition system operates mainly in low frequency, high frequency, hyperfrequency and microwave frequency band.Wherein, the radio-frequency recognition system that is operated in hyperfrequency (UHF) frequency range due to have volume little, read distance, the message transmission rate advantages of higher is subject to extensive concern and research.At present, the ultrahigh-frequency tag antenna adopts single face bending dipole structure more, optimize bending shape by distinct methods and reach targets such as reducing volume and raising performance, but, label antenna volume based on this single face bending dipole structure is still larger, performance is also good not, needs to adopt other principle and structure further to improve.
The utility model content
The purpose of this utility model is a kind of New-type label antenna structure that is different from the single face bending dipole antenna of design, thereby realizes making the further miniaturization of label antenna and have the target of superior performance.Adopt the label antenna volume of structure described in the utility model extra small, and have wider bandwidth of operation and omni-directional, gain higher.The utility model provides a kind of method that solves the further miniaturization issues of label antenna, is particularly suitable for needing label antenna miniaturization and isotropic field to use in RFID ticketing system, gate control system etc.
The technical solution of the utility model is:
A kind of two-sided microminiature RFID label antenna, described label antenna is comprised of two-sided antenna structure, substrate and RFID label chip.Described two-sided antenna etch structures is in described substrate tow sides; Two arms of the dipole shape structure in described RFID label chip and described two-sided antenna structure are connected.
Described antenna adopts bilateral structure, is etched in respectively the substrate two sides, and one side is dipole shape structure, and another side is symmetrical clip type structure.
Length and the width of described dipole shape structure can be adjusted.
Each edge lengths and the live width of described symmetrical clip type structure can be adjusted respectively.
Described substrate adopts the PET thin-film material, but can select other material according to concrete applied environment.
Described RFID label chip adopts Monza 4, but can select other chip according to concrete applied environment.
Described RFID label chip and described dipole shape structure can be adjusted on described substrate center line in the position on described substrate.
The working frequency range of described RFID label antenna can be adjusted according to concrete applied environment.
Described two-sided antenna structure is not limited only to the RFID field, also can be used for other field of antenna.
The beneficial effects of the utility model are:
By adopting the left-handed materials principle, a kind of novel two-sided microminiature RFID tag antenna structure has been proposed, the label antenna cumulative volume is further reduced, but also have performance preferably.Not directly electrical connection between each surface antenna structure of two-sided antenna, by the coupling delivered current, by adjusting length, the width of dipole shape structure, and each edge lengths and the live width of symmetrical clip type structure, can realize the impedance real part of label antenna and the adjustment of imaginary part, realize from coupling, need to increase matching network shared space thereby further reduced the single face bending dipole antenna.Finally, adopt the label antenna volume of structure described in the utility model extra small, and have wider bandwidth of operation and omni-directional, gain higher.
Description of drawings
Below in conjunction with drawings and Examples, the utility model is described further.
Fig. 1 is the structural representation of the preferred embodiment of the utility model when working in 915MHz.
Fig. 2 is the schematic diagram of the dipole shape structure (being positioned at the substrate one side) of the preferred embodiment of the utility model when working in 915MHz.
Fig. 3 is the schematic diagram of the symmetrical clip type structure (being positioned at the substrate another side) of the preferred embodiment of the utility model when working in 915MHz.
Fig. 4 is that operating frequency of the present utility model is with the trend analogous diagram of open circuit minor matters 5 length variations.
Fig. 5 is the input impedance analogous diagram of the preferred embodiment of the utility model when working in 915MHz.
Fig. 6 is E face and the H side gains analogous diagram of the preferred embodiment of the utility model when working in 915MHz.
In figure, the 1.RFID label chip, 2. dipole shape structure, the 3.PET film substrate, 4. symmetrical clip type structure 5. is used for adjusting the open circuit minor matters of operating frequency.
Embodiment
Further illustrate the technical solution of the utility model below in conjunction with Figure of description and specific embodiment.
Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
As shown in Figure 1, be the structural representation of the preferred embodiment of a kind of two-sided microminiature RFID label antenna of the utility model.The present embodiment comprises that (what use in the present embodiment is Monza 4 chips for PET film substrate 3, RFID label chip 1, impedance when operating frequency is 915MHz is 11-j143 Ω), dipole shape structure 2, symmetrical clip type structure 4, according to different condition and demand, dipole shape structure 2 and symmetrical clip type structure 4 can adopt the good conductor processing such as aluminium foil or silver.
As shown in Figure 2, be the schematic diagram of the dipole shape structure (being positioned at the substrate one side) of the preferred embodiment of the utility model when working in 915MHz.In figure, RFID label chip 1 is connected with two arms of dipole shape structure 2, all be positioned at the one side of the PET film substrate 3 that is of a size of 50*5*0.05mm3, wherein, RFID label chip 1 should be positioned at the center of PET film substrate 3, and the slightly skew of the broadside in the symmetrical clip type structure 4, thereby adjust the feed effect.In addition, the width of increase (reducing) dipole shape structure 2 can reduce the real part of (increase) label antenna input impedance.The length that increases (reducing) dipole shape structure 2 can reduce (raising) operating frequency.
As shown in Figure 3, be the schematic diagram of the symmetrical clip type structure (being positioned at the substrate another side) of the preferred embodiment of the utility model when working in 915MHz.In figure, symmetrical clip type structure 4 is etched in the another side of PET film substrate 3, obtained by a clip type structure mirror image symmetry, and except a side broadside live width is 3mm, the wide 0.5mm that is in all the other each sidelines, the dual-side distance of open circuit minor matters 5 is 0.5mm.According to the different application environment, by increasing the length of (reducing) open circuit minor matters 5, can reduce easily the operating frequency of (raising) label antenna, in the situation that only change open circuit minor matters 5 length, the adjusting range of label antenna centre frequency is 896MHz-965MHz, bandwidth of operation (10dB return loss bandwidth) is about 100MHz, can satisfy various countries uhf band RFID application standard, the label antenna operating frequency with the trend analogous diagram of open circuit minor matters 5 length variations as shown in Figure 4.The curve that in figure, solid line represents is the preferred embodiment of this patent when operating frequency is 915MHz, and the length of the minor matters 5 of opening a way this moment is 17.5mm, and the label antenna centre frequency is 915MHz, and-10dB return loss bandwidth is about 100MHz.
As shown in Figure 5, be the input impedance value of the preferred embodiment of the utility model when working in 915MHz.The input impedance real part of this preferred embodiment when 915MHz is 6.8 Ω, and imaginary part is 143.7 Ω, formed good conjugate impedance match with the 11-j143 Ω impedance of Monza 4RFID label chip.
As shown in Figure 6, be E face and the H side gains analogous diagram of the preferred embodiment of the utility model when working in 915MHz, as seen from the figure, label antenna described in the utility model has good omni-directional.
Annotate: suppose that center with label antenna described in the utility model is positioned over the initial point of three-dimensional cartesian coordinate system and chip and XOZ face coplanar, the long edge Z direction placement of described label antenna, the E face of described label antenna is the XOZ face, the H face is the XOY face.
These are only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent transformation that utilizes the utility model content to do; or with the utility model directly/indirectly be used in concrete equipment or other relevant technical field, include in scope of patent protection of the present utility model.
Claims (5)
1. a two-sided microminiature RFID label antenna, is characterized in that, described label antenna comprises: two-sided antenna structure, substrate, RFID label chip;
Described two-sided antenna etch structures is in described substrate tow sides; Two arms of the dipole shape structure in described RFID label chip and described two-sided antenna structure are connected.
2. label antenna according to claim 1, is characterized in that, described antenna adopts bilateral structure, lays respectively at the substrate two sides, and one side is dipole shape structure, and another side is symmetrical clip type structure.
3. label antenna according to claim 1 and 2, is characterized in that, length and the width of described dipole shape structure can be adjusted.
4. label antenna according to claim 2, is characterized in that, each edge lengths and the live width of described symmetrical clip type structure can be adjusted respectively.
5. label antenna according to claim 1, is characterized in that, described RFID label chip and described dipole shape structure can be adjusted on described substrate in the position on described substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220542857 CN202997055U (en) | 2012-10-23 | 2012-10-23 | Double-sided subminiature RFID tag antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220542857 CN202997055U (en) | 2012-10-23 | 2012-10-23 | Double-sided subminiature RFID tag antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202997055U true CN202997055U (en) | 2013-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220542857 Expired - Fee Related CN202997055U (en) | 2012-10-23 | 2012-10-23 | Double-sided subminiature RFID tag antenna |
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| CN (1) | CN202997055U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904023A (en) * | 2012-10-23 | 2013-01-30 | 北京邮电大学 | Two-sided subminiature RFID (radio frequency identification) tag antenna |
-
2012
- 2012-10-23 CN CN 201220542857 patent/CN202997055U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904023A (en) * | 2012-10-23 | 2013-01-30 | 北京邮电大学 | Two-sided subminiature RFID (radio frequency identification) tag antenna |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20171023 |