CN202695714U - Metal surface printed super-high-frequency RFID tag antenna - Google Patents
Metal surface printed super-high-frequency RFID tag antenna Download PDFInfo
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- CN202695714U CN202695714U CN 201220253210 CN201220253210U CN202695714U CN 202695714 U CN202695714 U CN 202695714U CN 201220253210 CN201220253210 CN 201220253210 CN 201220253210 U CN201220253210 U CN 201220253210U CN 202695714 U CN202695714 U CN 202695714U
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- label
- tag antenna
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Abstract
The utility model relates to a radio frequency tag antenna, in particular to a metal surface printed super-high-frequency RFID (Radio Frequency Identification) tag antenna. The tag antenna provided by the utility model comprises a plane paster and a tag chip, wherein a metal paste is printed on one side of the plane paster, and the tag chip is installed on the side of the plane paster, which is printed by the metal paste; and the plane paster is then glued to a square foam medium material so as to form the metal surface printed super-high-frequency RFID tag antenna. The tag antenna provided by the utility model can work at frequencies from 902 MHz-927MHz, and has the characteristics of simple structure and small size; through plentiful of simulation and actual measurement, the tag antenna provided by the utility model is proved to have the characteristics of high gain, long identifying-reading distance and the like compared with a similar antenna when used on the metal surface, and can be actually applied to the metal surface; the whole area of the antenna is 95mm*45mm, the longest reading distance can reach 4.5 m; and meanwhile, a surface printed structure is adopted, the tag is low in cost as a whole, and batch production is easy.
Description
Technical field
The utility model relates to radio-frequency label antenna, particularly a kind of metal surface ultrahigh frequency RFID printed label antenna.
Background technology
For radio-frequency label antenna, state's inner metal surface label technique still is in the starting stage, many metal surfaces label antenna all is improved on traditional dipole label antenna, reduces metallic reflection in the face of the impact of label by the distance that increases label antenna and metal surface.
The distance H of label antenna and metal surface should keep the above height of 1cm, although improved like this distance that reads of label, but the volume of whole label and cost are increased, the Bandwidth Reduction of antenna, do not solve well surface metal to the impact of label antenna, this moment, performance its performance that is used for nonmetallic surface that is far from of label antenna was good.For example open day is on April 25th, 2012, publication number is that the Chinese patent literature of CN202205228U discloses the anti-subsides ultrahigh frequency electronic tag of taking off that disturb a kind of metal surface, it is characterized in that, RFID electronic tag for composite construction, comprise successively the adhesive sticker bottom by the end to face, " island " type Composition spacer, the fragile paper substrate, amount to doublet antenna and chip, adhesive sticker surface layer and top layer plane materiel, antenna and fragile paper substrate strong bonded are integral, chip and antenna are electrically connected, " island " type Composition spacer is over against the chip position, and the size of this Composition spacer is less than the size of fragile paper substrate.The volume of the label of this scheme and cost are obviously larger, and this Composition spacer still can affect the performance of label antenna.
Thereby occurred again having used the metal surface based on the microstrip antenna of ceramic dielectric, it utilizes the high-k of ceramic dielectric so that the volume of antenna can be accomplished very little, utilize the metal surface as oneself larger reflecting surface so that the performance of antenna is very stable, but because the cost of ceramic antenna is too high, be not suitable for the low cost batch production of electronic tag.
Also have the label antenna scheme of another applicable metal surface to be: between aerial radiation face and metal covering, to increase one deck AMC(artificial magnetic conductor) structure, as shown in Figure 1, comprise electronic tag (1), AMC structure (2), metal surface (3), medium one (4), medium two (5), the AMC structure is between medium one and medium two, be electronic tag above the medium one, medium two is following to be the metal surface.High-impedance behavior by AMC makes the magnetic current direction that produces between electronic tag and the AMC identical with the magnetic current direction between metal covering and the AMC, thereby improve the gain of electronic tag and read distance, but difficulty and the cost of the at present research of this technology are all very high, still are in laboratory stage.
The utility model content
The utility model provides a kind of metal surface ultrahigh frequency RFID printed label antenna for overcoming above-mentioned technical problem, and this antenna can be worked at 902MHz-928MHz, and simple in structure, volume is little, and is and low-cost, also has the characteristics of high-gain.
The technical solution of the utility model is as follows:
Metal surface ultrahigh frequency RFID printed label antenna, it is characterized in that: comprise plane paster and label chip, a type metal slurry of described plane paster, label chip is installed on the side that is printed with the metal slurry of plane paster, the plane paster is pasted on the square foamed dielectric material, forms metal surface ultrahigh frequency RFID printed label antenna.
Described planar medium material is PVC film, perhaps paper.
Described metal slurry is silver slurry, perhaps copper slurry, perhaps aluminium paste.
When this label antenna was fixed on metal surface (no matter using which face of label to be affixed on metal) use, label antenna can equivalence become the PIFA antenna model.Metal flat this moment is as the reflecting surface of antenna, will produce very wholesome effect to the performance of antenna.
The beneficial effects of the utility model are as follows:
The print structure that the utility model adopts can be so that production technology be simplified, and low production cost can be worked at 902MHz-928MHz, has characteristics simple in structure, that volume is little; By emulation and the actual measurement a large amount of to antenna, proved this antenna applications and compared similar antenna in the metal surface and have that gain is high, characteristics such as recognition distance etc., be the label antenna that can really be applied to the metal surface; The size of whole antenna is 95mm*45mm, label read farthest the distance can reach 4.5m; Simultaneously because the employing of surface printing structure so that whole label with low cost, be easy to batch production.
Description of drawings
Fig. 1 is the structural representation that increases one deck AMC between aerial radiation face and metal covering
Fig. 2 is plane of the present utility model paster
Fig. 3 is the structural representation of the PIFA antenna model of the utility model equivalence
Fig. 4 is the schematic diagram that concerns of slotting length among the utility model embodiment and antenna impedance
Fig. 5 is that the utility model is attached to the antenna pattern on the FR-4
Fig. 6 is that the utility model is attached to the antenna pattern on the foam medium
Wherein, Reference numeral is: 1 electronic tag, 2 AMC structures, 3 metal surfaces, 4 media, one, 5 medium, two, 6 plane pasters, 7 label chips, 8 square foamed dielectric material.
Embodiment
As shown in Figure 2, metal surface ultrahigh frequency RFID printed label antenna, comprise plane paster 6 and label chip 7, a type metal slurry of described plane paster 6, label chip 7 is installed on the side that is printed with the metal slurry of plane paster 6, plane paster 6 is pasted on the square foamed dielectric material 8, forms metal surface ultrahigh frequency RFID printed label antenna.Wherein: W=45mm, L=95mm, h=5mm, w1=31mm.
Described plane paster 6 is PVC film, perhaps paper.
Described metal slurry is silver slurry, perhaps copper slurry, perhaps aluminium paste.
As shown in Figure 3, when this label antenna was fixed on metal surface (no matter using which face of label to be affixed on metal) use, label antenna can equivalence become the PIFA antenna model.Metal flat this moment is as the reflecting surface of antenna, will produce very wholesome effect to the performance of antenna.
Theory analysis after the equivalence and emulation:
Equivalence was for the PIFA structure when label antenna was affixed on dielectric surface, so this label antenna also satisfies λ/4 condition of resonances, its resonance frequency f r is main relevant with length L and the width W of paster.But the relation approximate representation between them is:
, wherein c represents the light velocity.
The impedance analysis of antenna:
The chip impedance of label commonly used is not 50 Ω of standard usually, and chip impedance generally is capacitive, and for realizing the impedance matching of chip and antenna, HFSS is optimized antenna by radio frequency simulation software.Label chip 7 impedances of adopting in the design are 24-j195 Ω, so need the target impedance of the antenna of coupling to should be 24+j195 Ω.The impedance matching of antenna can realize by the slotting length of adjusting antenna, be illustrated in figure 4 as slotting length w1 to the impact of antenna impedance.
By the antenna impedance characteristic is carried out the parameter scanning analysis as can be known, the variation of w1 is larger to the impedance influences of antenna, slotting length w1＜34 o'clock, impedance variation is milder, and whole antenna is perception, when the length of groove continues to increase, the real impedance of antenna can sharply increase, antenna shows as capacitive, finds that by simulation analysis impedance is 11+j194 Ω when the slotting length w1=31, and satisfy conjugate impedance match with the impedance of label chip 7 this moment.
The metal covering size is on the impact of antenna:
Because electronic tag is attached on the limited metal ground plane, when the electrical characteristic parameter of researching antenna, also to consider the size of ground plane to the impact of antenna actual gain, table 1 has been listed electronic tag, and to lay respectively at the metal surface area size be 45 * 45mm
2, 100 * 100mm
2, 200 * 200mm
2, 400 * 400mm
2The change in gain situation of antenna:
The relation of table 1 metal surface size and antenna gain
| ? | 45×45mm 2 | 100×100mm 2 | 200×200mm 2 | 400×400mm 2 |
| Gain (dBi) | 0.27 | 1.17 | 2.75 | 3.92 |
Data are presented at label at 45 * 45mm in the table
2Metal surface work (being equivalent to label antenna works independently) time, antenna is lower in gain, only has 0.27dBi, along with the gain of the increase antenna of metal surface area also can strengthen to some extent.But the gain of antenna is not unlimited the increase yet, find in the test when metal surface area is increased to a certain size, and the radiation direction of antenna meeting distorted, so that weaken perpendicular to the radiation field of radiating surface, this moment, the gain meeting of antenna descended to some extent.
Dielectric thickness is on the impact of the beamwidth of antenna:
The bandwidth of label antenna also is to weigh an important indicator of antenna performance, and frequency band is wider, and the efficient of antenna is higher, can effectively improve the bandwidth of antenna by the height h that adjusts dielectric layer, when the height of dielectric layer increases, the bandwidth of antenna is broadened, the efficient of antenna improves.But the height that increases antenna can make the volume of antenna increase, and has also destroyed the low section characteristic of antenna, and comprehensive conclusions is got h=5mm in design.By simulation analysis, when the medium height is h=5mm, the reflection coefficient of antenna-bandwidth below the 10dB is 30MHz (910MHz-940MHz), this antenna has good frequency bandwidth characteristics.
Dielectric material is on the impact of antenna:
Analyzed two kinds of typical media in the design to the impact of antenna gain, be illustrated in figure 5 as electronic tag be attached to FR-4 (
H=5mm) directional diagram on, the size of metal mirror are 400 * 400mm
2, this moment, the gain of antenna was 2.27dBi.In the direction of vertical antenna radiating surface, gain is maximum, Fig. 6 be label be attached to foam medium (
H=5mm) directional diagram on, the maximum gain of antenna are 3.92dBi, but the maximum gain direction of antenna is to depart from the direction of vertical antenna radiating surface 45 degree.
Object test:
Use the etched flat plane antenna of copper sheet paper, be pasted on the foam medium.Label chip 7 uses the SL3ICS1202G2XL chip of NXP semiconductor company, and the impedance of this chip is 24-j195 Ω, and test is affixed on label the metal plate central authorities of 25cm*25cm; The transmitting power and the 6dBi circular polarized antenna that re-use MR6021 model reader 1W are distinguished label.The actual measurement decipherment distance is greater than 4 meters.
Claims (3)
1. metal surface ultrahigh frequency RFID printed label antenna, it is characterized in that: comprise plane paster (6) and label chip (7), a type metal slurry of described plane paster (6), label chip (7) is installed on the side that is printed with the metal slurry of plane paster (6), plane paster (6) is pasted on the square foamed dielectric material, forms metal surface ultrahigh frequency RFID printed label antenna.
2. metal surface according to claim 1 ultrahigh frequency RFID printed label antenna, it is characterized in that: described plane paster (6) is PVC film, paper.
3. metal surface according to claim 1 ultrahigh frequency RFID printed label antenna, it is characterized in that: described metal slurry is silver slurry, perhaps copper slurry, perhaps aluminium paste.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220253210 CN202695714U (en) | 2012-05-31 | 2012-05-31 | Metal surface printed super-high-frequency RFID tag antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220253210 CN202695714U (en) | 2012-05-31 | 2012-05-31 | Metal surface printed super-high-frequency RFID tag antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202695714U true CN202695714U (en) | 2013-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220253210 Expired - Fee Related CN202695714U (en) | 2012-05-31 | 2012-05-31 | Metal surface printed super-high-frequency RFID tag antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202695714U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111799012A (en) * | 2020-06-23 | 2020-10-20 | 厦门大学 | Antioxidant copper material and preparation method thereof |
-
2012
- 2012-05-31 CN CN 201220253210 patent/CN202695714U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111799012A (en) * | 2020-06-23 | 2020-10-20 | 厦门大学 | Antioxidant copper material and preparation method thereof |
| CN111799012B (en) * | 2020-06-23 | 2023-02-28 | 厦门铜乐科技有限公司 | Antioxidant copper material and preparation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20140531 |