CN107104267A - A kind of RFID paster antennas of embedded couple feed - Google Patents
A kind of RFID paster antennas of embedded couple feed Download PDFInfo
- Publication number
- CN107104267A CN107104267A CN201710250929.3A CN201710250929A CN107104267A CN 107104267 A CN107104267 A CN 107104267A CN 201710250929 A CN201710250929 A CN 201710250929A CN 107104267 A CN107104267 A CN 107104267A
- Authority
- CN
- China
- Prior art keywords
- radiation patch
- embedded
- rfid
- paster
- couple feed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
Landscapes
- Waveguide Aerials (AREA)
Abstract
The invention discloses a kind of RFID paster antennas of embedded couple feed, including：Radiation patch, medium substrate, grounded metal paster, microstrip feed line and label chip；Radiation patch is arranged on the upper surface of medium substrate, and grounded metal paster is arranged on the lower surface of medium substrate；A cross bath, center line intersection point and the radiation patch center superposition of the bar groove of cross bath two are provided with the middle part of radiation patch；Cross bath is internally embedded a L-shaped microstrip feed line, and label chip is welded on L-shaped microstrip feed line.The present invention uses embedded coupling feed way, with broadband, circular polarisation, anti-metal, the advantages such as impedance regulation, small size that are easy to, and worldwide ultrahigh frequency RFID application bands is covered, with higher gain.
Description
Technical field
The present invention relates to RFID antenna technical field, the RFID pasters day of more particularly to a kind of embedded couple feed
Line.
Background technology
REID (Radio Frequency Identification, RFID), also known as radio frequency identification, be
The contactless automatic identification technology that a kind of utilization electromagnetic wave is realized.It flies as the core component of Internet of Things
The development of speed.RFID system is made up of reader, label and upper computer software, during RFID communication, electronic tag
Sensitivity will well below reader sensitivity, and label antenna is as the source device of tag energy, in communication process
Play the role of important.
In fields such as retail business, logistics, it is more and more extensive that super high frequency radio frequency identification (UHF-RFID) technology is applied.It is right
In frequency range used in ultrahigh frequency RFID, there are different frequency range approval standards, the 840MHz- that for example China uses in different countries
845MHz and 920MHz-925MHz, and the U.S., Canada and Mexico allow the frequency range used to be 902MHz to 928MHz.Cause
This, design ultrahigh frequency RFID covering the whole world is had extremely important using the ultra wide band label antenna of frequency range (840MHz-960MHz)
Meaning.
In present market, most RFID system uses the reader antenna of circular polarisation.When label is used
During the antenna of linear polarization, very big polarization mismatch just occurs in communication process, so as to greatly reducing reading distance.Very
To when reader antenna is also to use linear polarization, the position of the label antenna placement of linear polarization, which is slightly mispositioned, just to be occurred completely
Polarization mismatch, so as to can not be communicated.
In many actual application environments, labeling requirement is adhered on the metal surface.Reflection due to metal to electromagnetic wave,
When label antenna presses close to metal, impedance matching, radiation efficiency, directionality, circular polarisation mode of circular polarized antenna of antenna etc.
It will change, greatly reduction can not even work the reading distance of label.Therefore the label day of an anti-metal is designed
Line be in the market in the urgent need to.
The RFID label chip of present in the market application is all the property that the high capacitive reactance of Low ESR is presented, and to realize impedance
Match somebody with somebody, realize maximum transimission power, label antenna must be designed to the reactance of the high induction reactance of Low ESR.Because different label chips have
Different impedance values, therefore design is easy to the label antenna of impedance regulation and is highly desirable to.
With the rise in the fields such as intelligent wearable electronic product Internet of Things, the size to product requires also more and more higher.
It is also the design key of commercial product if causing that the size of product is minimum in the case where realizing superior performance index.
The content of the invention
It is an object of the invention to the shortcoming and deficiency for overcoming prior art, there is provided a kind of RFID of embedded couple feed
Paster antenna, the antenna use embedded coupling feed way, with broadband, circular polarisation, anti-metal, be easy to impedance regulation,
The advantages such as small size, and worldwide ultrahigh frequency RFID application bands are covered, with higher gain.
The purpose of the present invention is realized by following technical scheme：A kind of RFID paster antennas of embedded couple feed,
Including：Radiation patch, medium substrate, grounded metal paster, microstrip feed line and label chip；
Radiation patch is arranged on the upper surface of medium substrate, and grounded metal paster is arranged on the lower surface of medium substrate；
It is provided with the middle part of radiation patch in a cross bath, the center line intersection point and radiation patch of the bar groove of cross bath two
The heart is overlapped；Cross bath is internally embedded a L-shaped microstrip feed line, and label chip is welded on L-shaped microstrip feed line.
It is preferred that, by changing the length of microstrip feed line and the welding position of label chip, the resistance of antenna can be adjusted
It is anti-.
Specifically, label chip is welded at L-shaped microstrip feed line end points 3.3mm.
It is preferred that, the equal cross bath width is 5mm, and length is respectively 36.2mm and 37.2mm.
It is preferred that, the L-shaped microstrip feed line is embedded in the inside of cross bath, and its total length is 35.9mm, and width is
1.7mm。
It is preferred that, radiation patch, grounded metal paster and microstrip feed line are made of copper product.
It is preferred that, medium substrate uses FR4 medium substrates.
It is preferred that, it is provided with two L-shaped grooves at radiation patch pair of horns, the diagonal of the summit of L-shaped groove in radiation patch
On, the opening of L-shaped groove is against radiation patch center.
It is preferred that, described two L-shaped grooves of diagonal angle have an identical width 2.3mm, length be respectively 14.5mm and
15.5mm。
It is preferred that, the antenna also includes a pair of short-circuit through holes, by getting through hole on microstrip feed line two ends, makes radiation patch
Upper strata is connected with grounded metal paster lower floor, by short-circuit through hole using grounded metal paster as label antenna a part, with
Reach the purpose of anti-metal.
Specifically, short-circuit through hole is arranged on the two ends end of L-shaped feeder line.
Specifically, short-circuit through hole is made of copper product.
Specifically, the radius of short-circuit through hole is 0.4mm.
The present invention compared with prior art, has the following advantages that and beneficial effect：
1st, perturbation of the present invention by cross bath and L-shaped groove to paster electric current, can inspire more preferable circular polarisation mould
Formula, and extend current path diminution antenna size.
2nd, the present invention can carry out couple feed by L-shaped microstrip feed line to radiation patch, realize broadband bandwidth.
3rd, the present invention by short-circuit through hole using grounded metal paster as label antenna a part, to reach anti-metal
Purpose, when label antenna works in metal surface, impedance operator and circular polarization characteristics will not only produce influence, and due to
The increase of grounded metal paster can produce bigger gain, and reading distance is added on the contrary.
Brief description of the drawings
Fig. 1 is the label antenna overlooking structure figure in embodiment.
Fig. 2 is the label antenna side block diagram in embodiment.
Fig. 3 is the label antenna return loss plot in embodiment.
Fig. 4 is the label antenna Circular polarization ratio figure in embodiment.
Fig. 5 is that the label antenna in embodiment is attached to different size metal surface reactance characteristic.
Fig. 6 is that the label antenna in embodiment is attached to different size metal surface resistance characteristic.
Fig. 7 is attached to the gain diagram of different size of metal surface for the label antenna in embodiment.
In Fig. 1 and Fig. 2,1- radiation patch, 2- medium substrates, 3- grounded metal pasters, 4- short circuit through holes, 5- is embedded to decline
Ribbon feeder, 6- label chips, 7-L shape grooves, 8- cross baths.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited
In this.
As depicted in figs. 1 and 2, the label antenna of the present embodiment includes radiation patch 1, medium substrate 2, grounded metal paster
3rd, short-circuit through hole 4, embedded microstrip feed line 5 and label chip 6, the radiation patch 1 are arranged on the upper surface of medium substrate 2,
The grounded metal paster 3 is arranged on the lower surface of medium substrate 2, as metal, i.e., radiation patch 1 is on upper strata, medium base
Plate 2 is in intermediate layer, and grounded metal paster 3 is in lower floor；
The middle part of the radiation patch 1 is provided with an asymmetric cross bath 8, and center line intersection point and the radiation of two bar grooves are pasted
Piece center superposition.It is provided with two L-shaped grooves 7 at the pair of horns of radiation patch 1, the diagonal of the summit of L-shaped groove in radiation patch 1
On, the opening of L-shaped groove is against radiation patch center.Perturbation by cross bath 8 and L-shaped groove 7 to paster electric current, can be excited
Go out more preferable circular polarisation pattern, and extend current path and reduce antenna size.
The cross bath 8 is internally embedded a L-shaped microstrip feed line 5, and radiation can be pasted by L-shaped microstrip feed line 5
Piece 1 carries out couple feed, realizes broadband bandwidth, by the length of embedded microstrip feed line 5, can adjust the resistance of label antenna
It is anti-；
The label chip 6 is welded on L-shaped microstrip feed line 5, and the difference impedance of the welding position of label chip 6 is different, this reality
The micro-strip line length for applying a chips left side is 3.3mm.The Monza4 of the model Impinj companies of the label chip 4, the type
Number chip working frequency be 924MHz when there is 11-j143 Ω input impedance and -17.4dBm threshold power.
Described short-circuit through hole 4 is the via of a connection upper strata of radiation patch 1 and the lower floor of grounded metal paster 3, is set
Short-circuit through hole 4 is arranged on the two ends end of L-shaped feeder line 5 in the two ends of L-shaped feeder line 5, the present embodiment.Will by short-circuit through hole 4
Grounded metal paster 3 as label antenna a part, to reach the purpose of anti-metal, when label antenna works in metal surface
When, impedance operator and circular polarization characteristics will not only produce influence, and due to the increase of grounded metal paster 3 can produce it is bigger
Gain, reading distance is added on the contrary；
In the present embodiment, the radiation patch 1, grounded metal paster 3, embedded microstrip feed line 5 and short-circuit through hole 4 are equal
It is made of copper product, the medium substrate 2 uses FR4 medium substrates；The size of the radiation patch 1 be 56.8mm ×
56.8mm, the planar dimension of the medium substrate 2 is identical with the size of grounded metal paster 3, is 66.8mm × 66.8mm, and
The thickness of medium substrate 2 is 1.6mm；The width of cross bath 8 it is equal be 5mm, length difference 1mm be respectively 36.2mm and
37.2mm.The L-shaped microstrip feed line is embedded in the inside of cross bath, and its total length is 35.9mm, and width is 1.7mm.It is described
Microstrip feed line terminal separately design and get through hole on short-circuit through hole, the end points at microstrip feed line two ends, upper strata is connected with lower floor, its
Radius is 0.4mm.Described two L-shaped grooves of diagonal angle have an identical width 2.3mm, length be respectively 14.5mm and
15.5mm。
The return loss plot of the label antenna of the present embodiment is as shown in figure 3, from the figure, it can be seen that -10dB bandwidth is covered
Lid worldwide ultrahigh frequency RFID system frequency range (840MHz-960MHz).
The label antenna axial ratio bandwidth curve of the present embodiment is as shown in figure 4, from the figure, it can be seen that 3dB axial ratio bandwidth
Also the 920MHz-925MHz frequency ranges of China be completely covers.
The label antenna of the present embodiment is placed in the impedance contrast of different size of metal surface as shown in Figure 5 and Figure 6, can be with
Find out, when label antenna is attached on metal, the resistance and reactance characteristic of antenna do not change substantially, therefore this antenna has
There is good anti-metal characteristic,
The label antenna of the present embodiment is placed in the gain contrast of different size of metal surface as shown in fig. 7, with metal
The increase of area, the gain of label antenna is also with increasing and tending towards stability, than big 6dBic in free space.It can be seen that this reality
Applying the label antenna of example has farther reading distance when metal surface works.
Above-described embodiment is preferably embodiment, but embodiments of the present invention are not by above-described embodiment of the invention
Limitation, other any Spirit Essences without departing from the present invention and the change made under principle, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (10)
1. a kind of RFID paster antennas of embedded couple feed, it is characterised in that including：Radiation patch, medium substrate, ground connection
Metal patch, microstrip feed line and label chip；
Radiation patch is arranged on the upper surface of medium substrate, and grounded metal paster is arranged on the lower surface of medium substrate；
A cross bath, center line intersection point and the radiation patch center weight of the bar groove of cross bath two are provided with the middle part of radiation patch
Close；Cross bath is internally embedded a L-shaped microstrip feed line, and label chip is welded on L-shaped microstrip feed line.
2. the RFID paster antennas of embedded couple feed according to claim 1, it is characterised in that by changing micro-strip
The length of feeder line and/or the welding position of label chip, can adjust the impedance of antenna.
3. the RFID paster antennas of embedded couple feed according to claim 1, it is characterised in that the cross bath
Width is equal.
4. the RFID paster antennas of embedded couple feed according to claim 1, it is characterised in that radiation patch, connect
Ground metal patch and microstrip feed line are made of copper product.
5. the RFID paster antennas of embedded couple feed according to claim 1, it is characterised in that medium substrate is used
FR4 medium substrates.
6. the RFID paster antennas of embedded couple feed according to claim 1, it is characterised in that in radiation patch one
Diagonal angle is provided with two L-shaped grooves, and the summit of L-shaped groove is on the diagonal of radiation patch, and the opening of L-shaped groove is against in radiation patch
The heart.
7. the RFID paster antennas of embedded couple feed according to claim 6, it is characterised in that described diagonal angle
Two L-shaped grooves have identical width.
8. the RFID paster antennas of embedded couple feed according to claim 1, it is characterised in that the antenna also includes
A pair of short-circuit through holes, by getting through hole on microstrip feed line two ends, make radiation patch upper strata be connected with grounded metal paster lower floor,
By short-circuit through hole using grounded metal paster as label antenna a part, to reach the purpose of anti-metal.
9. the RFID paster antennas of embedded couple feed according to claim 8, it is characterised in that short-circuit through hole is set
In the two ends end of L-shaped feeder line.
10. the RFID paster antennas of embedded couple feed according to claim 8, it is characterised in that short-circuit through hole is adopted
It is made of copper product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710250929.3A CN107104267A (en) | 2017-04-18 | 2017-04-18 | A kind of RFID paster antennas of embedded couple feed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710250929.3A CN107104267A (en) | 2017-04-18 | 2017-04-18 | A kind of RFID paster antennas of embedded couple feed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107104267A true CN107104267A (en) | 2017-08-29 |
Family
ID=59656272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710250929.3A Pending CN107104267A (en) | 2017-04-18 | 2017-04-18 | A kind of RFID paster antennas of embedded couple feed |
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| Country | Link |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110581356A (en) * | 2019-09-12 | 2019-12-17 | 天津大学 | Novel coplanar waveguide dual-frequency antenna |
| CN111146585A (en) * | 2020-01-21 | 2020-05-12 | 京东方科技集团股份有限公司 | Antenna unit and antenna device |
| WO2022032577A1 (en) * | 2020-08-13 | 2022-02-17 | Telefonaktiebolaget Lm Ericsson (Publ) | Antenna radiator, and antenna |
| CN114597646A (en) * | 2022-04-11 | 2022-06-07 | 湖南迈克森伟电子科技有限公司 | Radiation unit |
| CN114937869A (en) * | 2022-05-05 | 2022-08-23 | 杭州电子科技大学 | Back-to-back wide-angle circularly polarized microstrip antenna and application thereof in intelligent door lock |
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Cited By (5)
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| CN110581356A (en) * | 2019-09-12 | 2019-12-17 | 天津大学 | Novel coplanar waveguide dual-frequency antenna |
| CN111146585A (en) * | 2020-01-21 | 2020-05-12 | 京东方科技集团股份有限公司 | Antenna unit and antenna device |
| WO2022032577A1 (en) * | 2020-08-13 | 2022-02-17 | Telefonaktiebolaget Lm Ericsson (Publ) | Antenna radiator, and antenna |
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| CN114937869A (en) * | 2022-05-05 | 2022-08-23 | 杭州电子科技大学 | Back-to-back wide-angle circularly polarized microstrip antenna and application thereof in intelligent door lock |
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Application publication date: 20170829 |