CN203039099U - Double-face superminiature UHF RFID (radio frequency identification) tag antenna derived from ENG material - Google Patents
Double-face superminiature UHF RFID (radio frequency identification) tag antenna derived from ENG material Download PDFInfo
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- CN203039099U CN203039099U CN 201320005150 CN201320005150U CN203039099U CN 203039099 U CN203039099 U CN 203039099U CN 201320005150 CN201320005150 CN 201320005150 CN 201320005150 U CN201320005150 U CN 201320005150U CN 203039099 U CN203039099 U CN 203039099U
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Abstract
The utility model discloses a double-face superminiature UHF RFID (radio frequency identification) tag antenna derived from an ENG material, and belongs to the technical field of radio frequency identification. Conductors are etched (or adopting other technical methods) on the right and reverse sides of a substrate of the tag antenna to serve as an antenna structure; one face of the substrate is small electric patch dipoles far smaller than working wavelength, and the other face of the substrate is bent line structures derived from the ENG material; and each tag chip and two arms of corresponding small electric patch dipole are connected. The tag antenna can be applied to frequency ranges such as UHF or microwave; taking central frequency of 915MHz and the chip adopting Monza4 as an example, the total size of the tag antenna adopting the structure is only 19.2*32*0.7mm<3> (0.059*0.098*0.002Lambada<3>), and the tag antenna has wider working bandwidth, omnidirectivity and extensive suitability and can be applied to other tag chips and working frequencies only by being simply adjusted. A method for solving the problem of further miniaturization of the tag antenna is provided, and the double-face superminiature UHF RFID tag antenna is especially suitable for fields needing miniaturization and omnidirectivity of the tag antenna such as RFID ticketing systems and access control systems.
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 made up of reader and electronic tag usually.Electronic tag is made up of label chip and label antenna, carries out exchanges data by electromagnetic wave and read write line, has functions such as intelligent read and coded communication.Label antenna is vital part in the rfid system, and rfid system is by label antenna emission, reception electromagnetic wave, thereby the realization 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 owing to have volume little, read distance, the message transmission rate advantages of higher is subjected to extensive concern and research.At present, the hyperfrequency label 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 bigger, performance is also good inadequately, needs to adopt other principle and structure further to improve.
The utility model content
The purpose of this utility model is the near field resonance parasitic structure with a kind of ENG of coming from (Negative Permittivity) material---folding line is introduced in the design of hyperfrequency label antenna, design a kind of New-type label antenna structure that is different from single face bending dipole antenna, thereby realize the target that makes the further miniaturization of label antenna and have superior performance.Adopt the label antenna volume of structure described in the utility model extra small, and have wideer bandwidth of operation, omni-directional and applicability widely, only need a simple adjustment just can be applicable to other label chip and operating frequency.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 UHF RFID label antenna that comes from the ENG material is characterized in that described label antenna comprises: two-sided antenna structure, substrate, RFID label chip;
Described two-sided antenna structure is positioned at described substrate tow sides; Two arms of the electric little paster dipole in described RFID label chip and the described two-sided antenna structure link to each other.
Described antenna adopts two-sided conductor structure, lays respectively at the substrate two sides, and one side is electric little paster dipole, and another side is the folding line structure.
Length and the width of the little paster dipole of described electricity can be adjusted.
Geometry site between each edge lengths of described folding line structure, live width, the bending number of turns, bending radian, each limit can be adjusted respectively.
The position of the little paster dipole of described RFID label chip and described electricity on described substrate can be adjusted at described substrate.
Described two-sided antenna structure is not only limited to the RFID field, can be used for the field that other need use antenna yet.
The beneficial effects of the utility model are:
By much smaller than introducing the folding line structure come from the ENG material near the electric little paster dipole of operation wavelength, 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 preferable performance.Directly be not electrically connected between each surface antenna structure of two-sided antenna, by the coupling delivered current, by length, the width of adjusting electric little paster dipole, and each edge lengths and the live width of folding line structure, can realize the input impedance real part of label antenna and the adjustment of imaginary part, realize from coupling, need increase the shared space of matching network thereby further reduced single face bending dipole antenna.Finally, adopt the label antenna volume of structure described in the utility model extra small, and have wideer bandwidth of operation, omni-directional and applicability widely, only need a simple adjustment just to can be applicable to other label chip or input impedance and be the antenna applications field of other value.
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 electric little paster dipole (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 folding line structure (being positioned at the substrate another side) of the preferred embodiment of the utility model when working in 915MHz.
Fig. 4 is the S11 parameters simulation figure of the preferred embodiment of the utility model when working in 915MHz (desirable do not have consumption).
Fig. 5 is the input impedance analogous diagram of the preferred embodiment of the utility model when working in 915MHz (desirable do not have consumption).
Fig. 6 is E face and the H side gains analogous diagram of the preferred embodiment of the utility model when working in 915MHz.
Among the figure, 1.RFID label chip, 2. electric little paster dipole, 3. substrate, 4. folding line structure.
Embodiment
Further specify 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 preferred embodiment of the two-sided microminiature UHF RFID label antenna of a kind of ENG of coming from material of the utility model.Present embodiment comprises FR4 (ε
r=4.4, μ
r=1) (what use in the present embodiment is Monza 4 chips for substrate 3, RFID label chip 1, impedance when operating frequency is 915MHz is 11-j143 Ω), electric little paster dipole 2, folding line structure 4, according to different condition and demand, electric little paster dipole 2 and folding line structure 4 can adopt conductor processing such as copper, aluminium or silver.The simulation result of carrying in the utility model specification is the result under the desirable no consumption situation.
As shown in Figure 2, be the schematic diagram of the electric little paster dipole (being positioned at the substrate one side) of the preferred embodiment of the utility model when working in 915MHz.Among the figure, RFID label chip 1 links to each other with two arms of the little paster dipole 2 of electricity, all is positioned to be of a size of 19.2*32*0.7mm
3The one side of FR4 substrate 3, wherein, RFID label chip 1 should be positioned at the center of substrate 3.In addition, the width that increases (reducing) electric little paster dipole 2 can reduce the real part of (increase) label antenna input impedance, and the length that increases (reducing) electric little paster dipole 2 can reduce (raising) operating frequency.
As shown in Figure 3, be the schematic diagram of the folding line structure (being positioned at the substrate another side) of the preferred embodiment of the utility model when working in 915MHz.Among the figure, folding line structure 4 is positioned at the another side of substrate 3, obtained by a folding line structure mirror image symmetry, the conversion of working frequency range can realize by each edge lengths, live width and the bending number of turns of adjusting the folding line structure, by the electric little paster dipole of reasonable adjustment and folding line structure, can satisfy various countries uhf band RFID application standard.
As shown in Figure 4 and Figure 5, be S11 parameter and the input impedance analogous diagram of the preferred embodiment of the utility model when working in 915MHz.The input impedance real part of this preferred embodiment when 915MHz is 10.76 Ω, and imaginary part is 143.73 Ω, formed good conjugate impedance match with the 11-j143 Ω impedance of Monza4RFID 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: it is coplanar to 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, the electric little paster dipole axis of described label antenna is placed along the Z direction, then the E face of described label antenna is the XOZ face, and the H face is the XOY face.
It below only is preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent transformation that utilizes the utility model content to do; or with the utility model directly/be used in concrete equipment or other relevant technical field indirectly, include in scope of patent protection of the present utility model.
Claims (5)
1. a two-sided microminiature UHF RFID label antenna that comes from the ENG material is characterized in that described label antenna comprises: two-sided antenna structure, substrate, RFID label chip;
Described two-sided antenna structure is positioned at described substrate tow sides; Two arms of the electric little paster dipole in described RFID label chip and the described two-sided antenna structure link to each other.
2. label antenna according to claim 1 is characterized in that, described antenna adopts two-sided conductor structure, lays respectively at the substrate two sides, and one side is electric little paster dipole, and another side is the folding line structure.
3. label antenna according to claim 1 and 2 is characterized in that, length and the width of the little paster dipole of described electricity can be adjusted.
4. label antenna according to claim 2 is characterized in that, the geometry site between each edge lengths of described folding line structure, live width, the bending number of turns, bending radian, each limit can be adjusted respectively.
5. label antenna according to claim 1 is characterized in that, the position of the little paster dipole of described RFID label chip and described electricity on described substrate can be adjusted at described substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320005150 CN203039099U (en) | 2013-01-06 | 2013-01-06 | Double-face superminiature UHF RFID (radio frequency identification) tag antenna derived from ENG material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320005150 CN203039099U (en) | 2013-01-06 | 2013-01-06 | Double-face superminiature UHF RFID (radio frequency identification) tag antenna derived from ENG material |
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| Publication Number | Publication Date |
|---|---|
| CN203039099U true CN203039099U (en) | 2013-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320005150 Expired - Lifetime CN203039099U (en) | 2013-01-06 | 2013-01-06 | Double-face superminiature UHF RFID (radio frequency identification) tag antenna derived from ENG material |
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| Country | Link |
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| CN (1) | CN203039099U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103022683A (en) * | 2013-01-06 | 2013-04-03 | 北京邮电大学 | Double-face superminiature UHF RFID (ultra high frequency radio frequency identification) tag antenna derived from ENG (electronic news gathering) material |
-
2013
- 2013-01-06 CN CN 201320005150 patent/CN203039099U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103022683A (en) * | 2013-01-06 | 2013-04-03 | 北京邮电大学 | Double-face superminiature UHF RFID (ultra high frequency radio frequency identification) tag antenna derived from ENG (electronic news gathering) material |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130703 |
|
| CX01 | Expiry of patent term |