CN207149682U - A kind of ultrahigh frequency electronic tag antenna - Google Patents
A kind of ultrahigh frequency electronic tag antenna Download PDFInfo
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- CN207149682U CN207149682U CN201720454068.6U CN201720454068U CN207149682U CN 207149682 U CN207149682 U CN 207149682U CN 201720454068 U CN201720454068 U CN 201720454068U CN 207149682 U CN207149682 U CN 207149682U
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- electronic tag
- ultrahigh frequency
- frequency electronic
- feed point
- antenna
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Abstract
The utility model discloses a kind of ultrahigh frequency electronic tag antenna, short-circuited conducting sleeve including closed loop, the chip for being arranged at the short-circuited conducting sleeve and two antenna arms to be formed are each extended over from left and right sides of the short-circuited conducting sleeve, the short-circuited conducting sleeve is provided with the first feed point and the second feed point, two antenna arm is arranged at the first feed point of short-circuited conducting sleeve described in respectively and the second feed point extends out, and the position that chip is set in first feed point and the relatively described short-circuited conducting sleeve of second feed point is asymmetrical 2 points.Ultrahigh frequency electronic tag antenna is packaged with the utility model ultrahigh frequency electronic tag, the ultrahigh frequency electronic tag antenna has asymmetric first feed point and the second feed point, the asymmetry of CURRENT DISTRIBUTION in antenna can be achieved, and then change greatest irradiation direction to reduce the influence of the human body accompanying by the ultrahigh frequency electronic tag.
Description
Technical field
A kind of ultrahigh frequency electronic tag antenna is the utility model is related to, more particularly to a kind of hyperfrequency of human body interference
Electronic label antenna.
Background technology
The key technology realized as Internet of Things physical layer, REID --- Radio Frequency
Identification (hereinafter referred to as RFID), particularly super high frequency radio frequency identification technology are with the advantage of its cost and performance most
Developed rapidly in recent years.Airport check luggage and baggage sorting label, the label for clothing of some brands, Brand Name Tobacco and Alcohol it is false proof
During label, the antifalsification label of jewelry, the environmental protection label of vehicle identify, ultrahigh radio frequency RFID label tag day can be seen more and more
Line and identification chip.
In above-mentioned application, it is required for designing a kind of different ultrahigh frequency RFID electronic tag per class article matched.This
The dielectric constant that ultrahigh frequency electronic tag antenna is primarily due to accompanying material is very sensitive.When label usage scenario becomes
Change, the material property of its object adhered to changes, and the performance (referring mainly to reading/writing distance) of designed electronic tag will before
It is obvious to reduce.Back scattering principle of the working method of ultrahigh frequency RFID electronic tag based on electromagnetic field.When electronic tag enters
The electromagnetism place of read write line transmitting, label antenna obtain energy from field and powered for label chip.Label chip passes through a system
Row air interface protocol and direct impedance become self-contained data of changing commanders and are modulated on uhf electromagnetic wave, and will by antenna
It beams back read write line.In the whole work process of electronic tag, label antenna is to the maximum link of its performance impact.
The ultrahigh frequency electronic tag of design management personnel also wants difficulty to be permitted compared with the electronic tag of design management class article
It is more.Human body is made up of four kinds of water, protein, fat, inanimate matter compositions, and its normal rates is：Water accounts for 55%, and protein accounts for
20%, body fat accounts for 20%, and inorganic matter accounts for 5%.The body composition of different people has differences, the different portions of same person body
The composition of position is also different.The electronic label antenna being attached on human body allows for being adapted to different people, and on the person
Diverse location.
It is understood that ultrahigh frequency electronic tag antenna is very sensitive to the dielectric constant of accompanying material.The relative dielectric of water
Constant is very high, and at 25 DEG C, the dielectric constant of water is 78.4.The relative dielectric constant of water can also change with temperature, at 0 DEG C
For 87.9,50 DEG C are 69.9.Each organ-tissue of human body shows different dielectric constants due to the difference of water content.According to
The data of US Federal Communication Committee's issue, under 915MHz frequencies, the human organ larger to electronic tag performance impact
The relative dielectric constant of tissue is respectively：
Blood：61.3
Fat：11.3
Skin (dry)：41.3
Skin (wet)：46.0
Muscle：56.0
It follows that a ultra-high frequency RFID label antenna of good performance that can be used for human body surface should be able to fit
Should in relative dielectric constant from 1 (dielectric constant for representing free space) to most badly it is possible 50 or so (moist skin+muscle+
The effective dielectric constant of blood) change.That is, it is necessary to design the dielectric constant on ultra-high frequency band with super large
The label antenna of bandwidth is just of good performance.
Researcher has thought some methods to be designed for the RFID label tag of human body surface.Number of patent application is
201610578527.1 it is entitled《A kind of personal management label of human body interference》Patent in, utility model people propose one
Two ultra-high frequency RFID labels of encapsulation and 1 low frequency tags in individual RFID label tag encapsulation, they store same data.Each
RFID label antenna segmentation arrangement, connected with tuning capacitance with regulation pad.Prolonged by changing regulation pad and tuning capacitance
The geometry cabling and improvement antenna match of long electrical length.It is obvious that this method is excessively complicated, cost is too high, does not possess volume production
Value.Number of patent application be 200980104012.6 it is entitled《Impedance matching is performed to prevent the RFID that performance reduces from reading
Device》Patent there is also it is same the problem of.Its label chip needs analysis antenna impedance mismatch situation in real time, automatically adjusts antenna
Input port circuit middle impedance matches, and mechanism is extremely complex, it is difficult to realizes.
Number of patent application be 200880009410.5 it is entitled《The RFID label tag of detuning characteristics with reduction》Patent
In, utility model people proposes a kind of symmetrical antenna structure.It is substantially right relative to each other that the main antenna body part has
Two opposite sides claimed, wherein each sidepiece extends outwardly to form general side towards V-arrangement.The structure is it is reported that Gao Jie can be reduced
Influence of the dielectric constant medium to antenna performance.
Number of patent application be 200510008513.8 it is entitled《RFID tags》Patent, then be in UHF electronic
13MHz spiral loops are added between label and human body, so as to reduce the effect of human body.But cost is added, simultaneously
It also result in influencing each other between ultrahigh frequency electronic tag and helical annular label.
Number of patent application be 201520198008.3 it is entitled《A kind of label apparatus, clothes and running record system》It is special
Profit, bi-layer substrate substantially make use of to add the space between ultrahigh-frequency tag antenna and human body skin.Apart from remote nature
Influenceed by human body with regard to small.Same number of patent application be 201320090820.5 it is entitled《Wirelessly penetrating with reinforced structure
Frequency identification label》Increase material near label chip, thicken label, increase label antenna and human body distance, reduce human body pair
The influence of antenna performance.
In addition on the timing chip used of some running exercises, ultra-high frequency RFID technology is also used.So-called meter
When chip be exactly ultrahigh frequency RFID electronic tag.The timing chip of prior art all on label paste foam by way of,
Increase label antenna and human body distance, reduce influence of the human body to antenna performance.Foam it is most thick can reach 6mm, most thin bubble
Cotton thickness is 0.5mm.Because foam has certain thickness, it is big with the general compound difficulty of RFID automation, makes
It is higher into cost, cost of labor can be increased again according to the artificial mode of production for pasting foam, foam can also dramatically increase in addition
The cost of transportation logisticses.
A kind of accordingly, it is desirable to provide inexpensive, high performance ultrahigh frequency electronic tag.
Utility model content
The utility model has inexpensive, high performance UHF electronic mark mainly solving the technical problems that providing one kind
Label.
In order to solve the above technical problems, the technical scheme that the utility model uses is：A kind of ultrahigh frequency electronic tag
Antenna, including the short-circuited conducting sleeve of closed loop, be arranged at the chip of the short-circuited conducting sleeve and each extended over from left and right sides of the short-circuited conducting sleeve
Two antenna arms formed, the short-circuited conducting sleeve are provided with the first feed point and the second feed point, and two antenna arm is respectively from the setting
Extended out in the first feed point of short-circuited conducting sleeve and the second feed point, first feed point and the relatively described short-circuited conducting sleeve of second feed point
The position of upper setting chip is asymmetrical 2 points.
As prioritization scheme of the present utility model, a wherein antenna arm and another antenna arm have similar knot
Structure.
As prioritization scheme of the present utility model, first feed point and second feed point are located at the short-circuited conducting sleeve respectively
The center line by chip position the left and right sides.
As prioritization scheme of the present utility model, the ultrahigh frequency electronic tag antenna has the short-circuited conducting sleeve of rectangle.
As prioritization scheme of the present utility model, first feed point and second feed point are located at the short-circuited conducting sleeve respectively
Two pairs of angular vertexs.
As prioritization scheme of the present utility model, the chip is located at the midpoint on the top side side of the short-circuited conducting sleeve.
As prioritization scheme of the present utility model, hyperfrequency that first feed point and the feed point claimed in contrast are formed
Electronic label antenna shows the impedance operator with chip conjugate impedance match in free space.
As prioritization scheme of the present utility model, hyperfrequency that second feed point and the feed point claimed in contrast are formed
Electronic label antenna shows the impedance characteristic with chip conjugate impedance match on the dielectric of 50 or so dielectric constants.
As prioritization scheme of the present utility model, a wherein antenna arm and another antenna arm have dissimilar tie
Structure.
As prioritization scheme of the present utility model, the CURRENT DISTRIBUTION on the whole short-circuited conducting sleeve and two antenna arms is asymmetric.
In order to solve the above technical problems, another technical scheme that the utility model uses is：A kind of UHF electronic mark
Label, the packaging body for be provided with ultrahigh frequency electronic tag antenna as described above, being coated on outside the ultrahigh frequency electronic tag antenna
And the packaging body for being packaged with ultrahigh frequency electronic tag antenna is attached to the attachment of human body clothing.
Relative to prior art, ultrahigh frequency electronic tag antenna, institute are packaged with the utility model ultrahigh frequency electronic tag
Stating ultrahigh frequency electronic tag antenna has asymmetric first feed point and the second feed point, and CURRENT DISTRIBUTION is not right in achievable antenna
Claim, and then change greatest irradiation direction to reduce the influence of the human body accompanying by the ultrahigh frequency electronic tag.
Brief description of the drawings
In order that content of the present utility model is easier to be clearly understood, below according to specific embodiment and combine attached
Figure, is described in further detail to the utility model：
Fig. 1 is the schematic diagram of the common ultrahigh-frequency tag antenna of one of which in the prior art.
Fig. 2 is the schematic diagram of another common ultrahigh-frequency tag antenna in the prior art.
Fig. 3 is the three-dimensional radiation directional diagram of common ultrahigh-frequency tag antenna shown in Fig. 1, Fig. 2.
Fig. 4 is the sectional view of the three-dimensional radiation directional diagram shown in Fig. 3.
Fig. 5 is the structural representation of the utility model superior electron label antenna.
Fig. 6 is the three-dimensional radiation directional diagram of the utility model ultrahigh frequency electronic tag antenna.
Fig. 7 is that the first feed point and chip are carried out conjugate impedance match signal by the utility model ultrahigh frequency electronic tag antenna
Figure.
Fig. 8 is that the second feed point and chip are carried out conjugate impedance match signal by the utility model ultrahigh frequency electronic tag antenna
Figure.
Embodiment
Technical scheme is described in further details with reference to the accompanying drawings and examples, following examples are not formed
Restriction to the application.
It is as shown in Figures 1 and 2 usual ultrahigh frequency electronic tag antenna 100 and ultrahigh frequency electronic tag day in the prior art
The schematic diagram of line 200.
The ultrahigh frequency electronic tag antenna 100 and ultrahigh frequency electronic tag antenna 200 have common feature.The superelevation
The structure of band electronic label antenna 100 and the ultrahigh frequency electronic tag antenna 200 is symmetrical, and the UHF electronic mark
The middle part of label antenna 100 has short-circuited conducting sleeve 110, and the middle part of the ultrahigh frequency electronic tag antenna 200 also has short-circuited conducting sleeve 220.
In the design of label antenna, the function of short-circuited conducting sleeve is primarily to electronic label antenna presentation small resistor, big capacitive reactance characteristic are defeated
Enter impedance, and then to provide more preferable conjugate impedance match, while can also solve caused ESD (ElectroStatic in production process
Discharge) electrostatic problem.There is symmetrical two feed points on the short-circuited conducting sleeve 110 of the ultrahigh frequency electronic tag antenna 100
120 outwards draw the antenna arm 130 of both sides.Have symmetrical two on the short-circuited conducting sleeve 210 of the ultrahigh frequency electronic tag antenna 200
Individual feed point 220 outwards draws the antenna arm 230 of both sides.The ultrahigh frequency electronic tag antenna 100 and the UHF electronic mark
Label antenna 200 is symmetrical dipole antenna, and such antenna has the three-dimensional radiation directional diagram of similar apple shape, as shown in Figure 3.
As shown in Figure 3 as can be seen that the greatest irradiation direction of common ultrahigh frequency electronic tag antenna 100,200 is exactly label
The normal orientation of plane.Fig. 4 is the sectional view in three-dimensional radiation direction shown in Fig. 3.The common ultrahigh frequency electronic tag 100,200
0 °~180 ° directions are placed along in sectional view shown in described Fig. 4, and the maximum direction of radiation is along 90 °~270 ° directions.
When the common ultrahigh frequency electronic tag antenna 100,200 is attached near human body surface, the common UHF electronic mark
The greatest irradiation direction of label 100,200 is just perpendicularly oriented to human body.
Refer to Fig. 5, the utility model ultrahigh frequency electronic tag antenna 300 using asymmetric feed point come reduce human body for
The interference of ultrahigh frequency electronic tag antenna performance.The utility model ultrahigh frequency electronic tag antenna 300 is packaged in a packaging body
To form ultrahigh frequency electronic tag (not shown) in (not shown).The packaging body is attached at people by an attachment (not shown)
The surface of body clothing.The ultrahigh frequency electronic tag antenna 300 includes the short-circuited conducting sleeve 310 of closed loop, is arranged at the short-circuited conducting sleeve 310
Middle part any chip 320 and two antenna arms 330,340 to be formed are each extended over from the left and right sides of the short-circuited conducting sleeve 310.Institute
State antenna arm 330,340 and be arranged at the first feed point 3101 of short-circuited conducting sleeve 310 and the second feed point 3102 extends out described in respectively,
The antenna arm 330 and the antenna arm 340 have similar structure.First feed point 3101 and the phase of the second feed point 3102
It is asymmetrical 2 points to the position that chip 320 is set on the short-circuited conducting sleeve 310, and respectively positioned at the logical of the short-circuited conducting sleeve 310
Cross the left and right sides of the center line of the position of chip 320.Because the first feed point 3101 and second feed point 3102 are relative to chip 320
To be asymmetric, the CURRENT DISTRIBUTION on whole short-circuited conducting sleeve 310 and antenna arm 330,340 is also asymmetric.In the present embodiment, this reality
There is the short-circuited conducting sleeve 310 of rectangle, first feed point 3101 and second feed point with novel ultra-high frequency electronic label antenna 300
3102 are located at two pairs of angular vertexs of the short-circuited conducting sleeve 310 respectively.The chip 320 is located at the top side side of the short-circuited conducting sleeve 310
Midpoint.
Fig. 6 show the three-dimensional radiological of the utility model ultrahigh frequency electronic tag antenna 300, the utility model hyperfrequency
The Y direction along figure of electronic label antenna 300 is put, because the utility model ultrahigh frequency electronic tag antenna 300 is with asymmetric
CURRENT DISTRIBUTION, therefore its three-dimensional antenna pattern (as shown in Figure 5) greatest irradiation direction (in figure be Z axis on semiaxis
Direction) relatively common ultrahigh frequency electronic tag antenna greatest irradiation direction for, change turns to upwardly direction in normal orientation,
If now the utility model ultrahigh frequency electronic tag antenna 300 is attached near human body skin, the human body skin is located at Z axis
Lower half direction of principal axis, then it can reduce radiation of the ultrahigh frequency electronic tag antenna 300 to human body.According to the principle of equal effects, human body is by this
The radiation of utility model ultrahigh frequency electronic tag antenna 300 reduces and also implies that the utility model ultrahigh frequency electronic tag antenna
300 are influenceed also relative reduction by human body.
It refer to shown in Fig. 7, in actual design, for first feed point 3101 and second feed point 3102
During design, can first analyze the first feed point 3101 and ultrahigh frequency electronic tag antenna that the feed point that claims in contrast is formed it is defeated
Enter impedance.Normal conditions can make the ultrahigh frequency electronic tag antenna of symmetrical first feed point 3101 show in free space
With the impedance operator of the conjugate impedance match of chip 320.Please continue to refer to shown in Fig. 8, then analyze the second feed point 3102 and claim in contrast
The ultrahigh frequency electronic tag antenna that is formed of feed point show on the dielectric of 50 or so dielectric constants and be conjugated with chip 320
The impedance characteristic of matching.Thus the initial value of the position of the first feed point 3101 and the second feed point 3102 is judged.Next, further according to
The effect of actual test is finely adjusted.
As a kind of test examples, designed using asymmetric feed point method and make the antenna of a human body interference, and
It is connected with Impinj Monza R6 chips and further compound turn into meets the design of the utility model ultrahigh frequency electronic tag antenna
The ultrahigh frequency electronic tag antenna of mode.Ultrahigh frequency electronic tag is added using general ultrahigh frequency electronic tag batch production technique
Work, 0.1mm is not not more than using any foam or other thickened materials, the gross thickness of finished product.On January 17th, 2017, in south
One head of the capital XuanWu Lake is run in test event, and the asymmetric feed point antenna that we design is close to 648 people of total
Ultrahigh frequency electronic tag.Then quickly through RFID (the Radio Frequency of 30dBm power outputs
Identification) read write line and 5.5dBi on the ground antenna system are to these ultrahigh frequency electronic tags, test
As a result none omission of all labels is shown, reaches our design object.
The utility model technology does not change the production technology of existing high-volume ultrahigh frequency electronic tag, without using foam yet
Or other thickened materials, and it is normal to have devised the dielectric with super large on ultra-high frequency band only by asymmetric feed point method
The ultrahigh frequency electronic tag antenna 300 of number bandwidth.The utility model ultrahigh frequency electronic tag antenna is through surveying the human body in more people
The tag reader effect of needs can be reached under diverse location, different temperatures, meet the requirement of practical application.
Described above to be not all of or unique embodiment, those of ordinary skill in the art are by reading the utility model
Specification and any equivalent change taken technical solutions of the utility model, are that claim of the present utility model is contained
Lid.
Claims (11)
1. a kind of ultrahigh frequency electronic tag antenna, including the short-circuited conducting sleeve of closed loop, it is arranged at the chip of the short-circuited conducting sleeve and described in
Two antenna arms to be formed are each extended at left and right sides of short-circuited conducting sleeve, the short-circuited conducting sleeve is provided with the first feed point and the second feed point, institute
State two antenna arms and be arranged at the first feed point of short-circuited conducting sleeve and the second feed point extends out described in respectively, it is characterised in that：It is described
The position that chip is set in first feed point and the relatively described short-circuited conducting sleeve of second feed point is asymmetrical 2 points.
2. ultrahigh frequency electronic tag antenna according to claim 1, it is characterised in that a wherein antenna arm and described
Another antenna arm has similar structure.
3. ultrahigh frequency electronic tag antenna according to claim 1, it is characterised in that first feed point and described second
Feed point is located at the left and right sides of the center line by chip position of the short-circuited conducting sleeve respectively.
4. ultrahigh frequency electronic tag antenna according to claim 1, it is characterised in that the ultrahigh frequency electronic tag antenna
Short-circuited conducting sleeve with rectangle.
5. ultrahigh frequency electronic tag antenna according to claim 4, it is characterised in that：First feed point and described second
Feed point is located at two pairs of angular vertexs of the short-circuited conducting sleeve respectively.
6. ultrahigh frequency electronic tag antenna according to claim 5, it is characterised in that：The chip is located at the short-circuited conducting sleeve
Top side side midpoint.
7. ultrahigh frequency electronic tag antenna according to claim 1, it is characterised in that：First feed point and in contrast
The ultrahigh frequency electronic tag antenna that the feed point of title is formed shows the impedance operator with chip conjugate impedance match in free space.
8. ultrahigh frequency electronic tag antenna according to claim 7, its spy is characterised by：Second feed point and therewith phase
The ultrahigh frequency electronic tag antenna that symmetrical feed point is formed shows on the dielectric of 50 or so dielectric constants to be total to chip
The impedance characteristic of yoke matching.
9. ultrahigh frequency electronic tag antenna according to claim 1, it is characterised in that：A wherein antenna arm and described
Another antenna arm has dissimilar structure.
10. ultrahigh frequency electronic tag antenna according to claim 9, it is characterised in that：The whole short-circuited conducting sleeve and two days
CURRENT DISTRIBUTION on line arm is asymmetric.
11. a kind of ultrahigh frequency electronic tag, set just like the ultrahigh frequency electronic tag described in any one in claim 1~10
Antenna, the packaging body that is coated on outside the ultrahigh frequency electronic tag antenna and by the ultrahigh frequency electronic tag antenna that is packaged with
Packaging body is attached to the attachment of human body clothing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720454068.6U CN207149682U (en) | 2017-04-26 | 2017-04-26 | A kind of ultrahigh frequency electronic tag antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720454068.6U CN207149682U (en) | 2017-04-26 | 2017-04-26 | A kind of ultrahigh frequency electronic tag antenna |
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| Publication Number | Publication Date |
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| CN207149682U true CN207149682U (en) | 2018-03-27 |
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ID=61659208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720454068.6U Active CN207149682U (en) | 2017-04-26 | 2017-04-26 | A kind of ultrahigh frequency electronic tag antenna |
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| Country | Link |
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| CN (1) | CN207149682U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106997985A (en) * | 2017-04-26 | 2017-08-01 | 刘慧君 | A kind of ultrahigh frequency electronic tag antenna |
| CN109713427A (en) * | 2018-11-29 | 2019-05-03 | 河北工业大学 | A kind of ultrathin flexible UHF RFID anti-metal tag antenna |
-
2017
- 2017-04-26 CN CN201720454068.6U patent/CN207149682U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106997985A (en) * | 2017-04-26 | 2017-08-01 | 刘慧君 | A kind of ultrahigh frequency electronic tag antenna |
| CN109713427A (en) * | 2018-11-29 | 2019-05-03 | 河北工业大学 | A kind of ultrathin flexible UHF RFID anti-metal tag antenna |
| CN109713427B (en) * | 2018-11-29 | 2021-01-29 | 河北工业大学 | Ultra-thin flexible UHF RFID anti-metal label antenna |
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