CN112216969A - Compact UHF RFID folding anti-metal tag antenna - Google Patents
Compact UHF RFID folding anti-metal tag antenna Download PDFInfo
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- CN112216969A CN112216969A CN202010999743.XA CN202010999743A CN112216969A CN 112216969 A CN112216969 A CN 112216969A CN 202010999743 A CN202010999743 A CN 202010999743A CN 112216969 A CN112216969 A CN 112216969A
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- gap
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- folding
- resonant ring
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- 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
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- 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
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- 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
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- Details Of Aerials (AREA)
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Abstract
The invention relates to a compact UHF RFID folding anti-metal tag antenna which comprises a flexible medium substrate and a folding antenna arranged on the flexible substrate. The foldable antenna is characterized by comprising a ground plane, an i-shaped patch, a non-resonant ring and a stub, wherein the ground plane and the non-resonant ring are respectively positioned on two sides of the i-shaped patch, and the i-shaped patch is interconnected with the ground plane through the stub; the non-resonant ring is positioned on the back of the i-shaped patch in a folding mode, and the ground plane is positioned on the bottom; a first gap is formed in one side, close to the stub line, of the i-shaped patch, a second gap is formed in the other side of the i-shaped patch, a middle gap is formed in the middle of the i-shaped patch, the first gap is communicated with the middle gap and is T-shaped, and the width of the first gap is larger than that of the second gap; two groups of groove gaps are distributed on two sides of the first gap, and each group of rectangular groove gaps comprises at least two rectangular grooves.
Description
Technical Field
The invention belongs to the technical field of tag antennas, and particularly relates to a compact UHF RFID folding type anti-metal tag antenna.
Background
With the popularization of the internet of things technology in various fields, application scenes of Radio Frequency Identification (RFID) tags gradually tend to be diversified, and some applications require that the tags be installed on articles made of different materials, such as glass, wood and even metal. Among these attachment materials, especially metals, have the greatest effect on antenna performance and even result in the antenna not functioning properly, and many tag design methods have been proposed in order to reduce the effect of the attached metal. For example, the distance between the tag and the surface of a metal object is raised, the dipole arms are folded into multiple sections, and the tag antenna is isolated from the metal by inserting a layer of Electromagnetic Band Gap (EBG) or Artificial Magnetic Conductor (AMC). Although good read performance is achieved. But greatly increases the thickness and the manufacturing cost of the electronic tag.
With the popularization of the internet of things technology in various fields, the application scenes of the RFID tags gradually tend to be diversified, and some application requirements are that the tags are installed on articles made of different materials, such as glass, wood and even metal. This places more stringent requirements on the size and construction of the RFID tag. The performance of the tag is greatly influenced by the size of the tag, so that the performance of the tag in a certain specific form or a certain size cannot meet the requirement, and the popularization of the RFID technology is influenced. The barrier faced by the RFID technology severely restricts the rapid development of the Internet of things. The design of the antenna becomes particularly important due to the reduced cost of the chip.
Disclosure of Invention
The invention provides a compact UHF RFID folding anti-metal tag antenna which can meet the requirements of miniaturization, higher gain, longer reading distance, anti-metal environment and wider frequency range. The technical scheme is as follows:
a compact UHF RFID folding anti-metal tag antenna comprises a flexible medium substrate and a folding antenna arranged on the substrate, and is characterized in that the folding antenna comprises a ground plane, an i-type patch, a non-resonant ring and a stub, wherein the ground plane and the non-resonant ring are respectively positioned on two sides of the i-type patch, the i-type patch is interconnected with the ground plane through the stub, and the stub is inserted into the i-type patch to reduce the input impedance of the patch; the non-resonant ring is positioned on the back of the i-shaped patch in a folding mode, and the ground plane is positioned on the bottom; a first gap is formed in one side, close to the stub line, of the i-shaped patch, a second gap is formed in the other side of the i-shaped patch, a middle gap is formed in the middle of the i-shaped patch, the first gap is communicated with the middle gap and is T-shaped, and the width of the first gap is larger than that of the second gap; two groups of groove gaps are distributed on two sides of the first gap, each group of groove gaps comprises at least two rectangular grooves, the stub is inserted into one group of groove gaps, each rectangular groove, the non-resonant ring and the first gap, and the middle gap and the second gap are used for adjusting the input impedance of the antenna to achieve conjugate matching with the chip.
Preferably, the flexible dielectric substrate is made of PET.
Each rectangular groove has a length of 4.9mm and a width of 0.77 mm.
The center of the i-type patch is provided with a feed port, and an IC chip is fixed at the feed port.
The invention has the following beneficial effects:
firstly, the compact UHF RFID folding anti-metal tag antenna can realize the flexibility of the antenna under the folding condition, can realize higher gain and longer reading distance, has a working frequency band covering an ultrahigh frequency band, and has a wide readable frequency range.
Secondly, the compact UHF RFID folding anti-metal tag antenna has the characteristics of miniaturization, very compact performance and small occupied area under the folding condition.
Thirdly, the compact UHF RFID folding type anti-metal tag antenna has the characteristic of metal resistance, is suitable for complex working environments, and has a long reading distance.
Drawings
Fig. 1 is a schematic structural diagram of a compact UHF RFID folded anti-metal tag antenna of the present invention.
FIG. 2 is a schematic diagram of the input impedance of the compact UHF RFID folded anti-metal tag antenna of the present invention.
FIG. 3 is a radiation pattern of the compact UHF RFID folded anti-metal tag antenna of the present invention.
FIG. 4 is a dimensional diagram of a compact UHF RFID folded anti-metal tag antenna of the present invention, wherein: l21, d1, d2, d3, d4, 12:6, L1, 11:9, L2, 0:7, L3, 7:18, L4, 0:81, w3, n 0: 23, n w 4:9, w1, 2:8.
Detailed Description
The invention provides a compact UHF RFID folding type anti-metal tag antenna. The compact UHF RFID folding type anti-metal tag antenna adopts an i-shaped patch (04) with a rectangular groove (03) and a rectangular groove (09), a square ground plane (01) is combined with a non-resonant ring (05), and a stub (02) is inserted into the i-shaped patch (04) to reduce the input impedance of the antenna. A non-resonant ring (05) is arranged on the back of the i-type patch (04) in a folding mode, and the capacitance and inductance effects introduced by the ring can effectively reduce the high resonant frequency of the antenna. The antenna comprises a rectangular groove (03), a rectangular groove (09), a non-resonant ring (05) and a first gap (06), wherein the middle gap (07) and a second gap (08) are used for adjusting the input impedance of the antenna to achieve conjugate matching with a chip, so that the maximum power exchange is realized.
As shown in fig. 1, the electronic tag includes: a PET (polyethylene terephthalate, 50 μm) board, an IC chip (chip), a folded antenna etched on the PET board, the antenna comprising: a square ground plane (01), an i-type patch (04), a non-resonant ring (05) and a stub (02); the dielectric substrate is used for attaching a square ground plane (01), an i-type patch (04), a non-resonant ring (05) and a stub (02); the square ground plane (01) is located to the left of the i-type patch (04), the i-type patch (04) is interconnected with the square ground plane (01) by a stub (02), and the stub (02) is inserted into the i-type patch (04) to reduce the input impedance of the antenna. Two rectangular grooves (03) are symmetrically distributed on two sides of the stub line (02). While two rectangular recesses (09) are provided at symmetrical positions with respect to the first gap (06). The non-resonant ring (05) is located on the right side of the i-shaped patch (04). The label is folded around a 21mm x 1.6mm flexible foam. The non-resonant ring (05) is folded to appear on the back of the i-type patch (04) and the square ground plane (01) is on the bottom. The compact UHF RFID label folding anti-metal antenna can realize the flexibility of the antenna under the folding condition, can realize higher gain and longer reading distance, has a working frequency band covering an ultrahigh frequency band, and has a wide readable frequency range.
By adjusting the length and the width of the non-resonant ring (05), the impedance and the resonant frequency of the antenna can be effectively changed, the input impedance of the antenna can be improved along with the increase of the length of the non-resonant ring, the resonant frequency point of the antenna is also increased, the change rate of the width to the input impedance is small, and therefore the width of the non-resonant ring can be adjusted to finely adjust the input impedance of the antenna.
In the specific embodiment of the invention, the feed port is installed at the central point of the i-type patch, so that the i-type patch can effectively adjust the impedance of the antenna to achieve good conjugate matching with the chip, the maximum power exchange is realized, the width of the feed port (chip) is 0.4mm, and the chip is installed on the feed port.
In the specific embodiment of the invention, the antenna is subjected to modeling simulation and parameter optimization design through HFSS, so that the tag antenna can achieve good impedance matching at 920MHz, and maximum power exchange is realized, and the antenna can well work on an ultrahigh frequency band.
Further, still include: a non-resonant ring (05). The non-resonant ring (05) is not connected to the i-patch (04) but appears on the back of the i-patch (04) in a folded manner.
In the embodiment of the invention, the dielectric substrate is made of PET, the dielectric constant is 3.3, and the thickness is 0.05 mm. The substrate made of the PET material can realize the flexibility of the label in the folding process, has soft texture and can not influence the radiation performance of the antenna.
In a specific embodiment of the invention, the radiating and ground layers are made by etching an aluminum foil (9 μm) initially deposited on a single layer flexible thin PET (polyethylene terephthalate, 50 μm) substrate. In this design, the Monza R6 microchip read sensitivity is-20 dBm, at 920MHz input impedance of 11.91-j 118.94 omega.
In a specific embodiment of the present invention, it is made by coating an adhesive on the back of a flexible PET film; the label was folded around a 21mm x 1.6mm flexible foam.
In a specific embodiment of the invention, the length and width of the rectangular groove (03), as well as the length and width of the non-resonant ring (02) and the first gap (06), the central gap (07) and the second gap (08), all have the effect of adjusting the impedance of the antenna.
The proposed antenna has been manufactured with excellent agreement between simulation and measurement results. The proposed tag antenna has a far read distance of 6.3m (with an equivalent omni-directional radiation power of 4W) on metal at a resonance frequency of 920 MHz.
Claims (4)
1. A compact UHF RFID folding anti-metal label antenna comprises a flexible medium substrate and a folding antenna arranged on the flexible substrate. The foldable antenna is characterized by comprising a ground plane, an i-type patch, a non-resonant ring and a stub, wherein the ground plane and the non-resonant ring are respectively positioned on two sides of the i-type patch; the non-resonant ring is positioned on the back of the i-shaped patch in a folding mode, and the ground plane is positioned on the bottom; a first gap is formed in one side, close to the stub line, of the i-shaped patch, a second gap is formed in the other side of the i-shaped patch, a middle gap is formed in the middle of the i-shaped patch, the first gap is communicated with the middle gap and is T-shaped, and the width of the first gap is larger than that of the second gap; two groups of groove gaps are distributed on two sides of the first gap, each group of groove gaps comprises at least two rectangular grooves, the stub is inserted into one group of groove gaps, each rectangular groove, the non-resonant ring and the first gap, and the middle gap and the second gap are used for adjusting the input impedance of the antenna to achieve conjugate matching with the chip.
2. The compact UHF RFID folded anti-metal tag antenna of claim 1, wherein: the flexible medium substrate is made of PET.
3. The compact UHF RFID folded anti-metal tag antenna of claim 1, wherein: each rectangular groove has a length of 4.9mm and a width of 0.77 mm.
4. The compact UHF RFID folded anti-metal tag antenna of claim 1, wherein: the center of the i-type patch is provided with a feed port, and an IC chip is fixed at the feed port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010999743.XA CN112216969B (en) | 2020-09-22 | 2020-09-22 | Compact UHF RFID folding anti-metal tag antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010999743.XA CN112216969B (en) | 2020-09-22 | 2020-09-22 | Compact UHF RFID folding anti-metal tag antenna |
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| Publication Number | Publication Date |
|---|---|
| CN112216969A true CN112216969A (en) | 2021-01-12 |
| CN112216969B CN112216969B (en) | 2021-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010999743.XA Active CN112216969B (en) | 2020-09-22 | 2020-09-22 | Compact UHF RFID folding anti-metal tag antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113991283A (en) * | 2021-10-26 | 2022-01-28 | 福州大学 | Miniaturized anti-metal ultrahigh frequency RFID (radio frequency identification) tag antenna with folding structure |
Citations (6)
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|---|---|---|---|---|
| JP2008070922A (en) * | 2006-09-12 | 2008-03-27 | Hitachi Ltd | Booster antenna |
| CN102930326A (en) * | 2011-08-12 | 2013-02-13 | 扬州稻源微电子有限公司 | Anti-metal radio frequency identification (RFID) tag and RFID system comprising tag |
| CN106602284A (en) * | 2016-11-30 | 2017-04-26 | 南京邮电大学 | Small-scale metal-resistant broadband tag antenna |
| TW201724656A (en) * | 2015-12-31 | 2017-07-01 | Join Yiuh Industry Co Ltd | Metal resistant flexible radio frequency identification tag achieves well reading sensitivity and obtains long distance reading effect |
| CN108321512A (en) * | 2017-01-18 | 2018-07-24 | 重庆邮电大学 | A kind of ultra wide band anti-metal UHF RFID label antennas with symmetrical structure |
| 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 |
-
2020
- 2020-09-22 CN CN202010999743.XA patent/CN112216969B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008070922A (en) * | 2006-09-12 | 2008-03-27 | Hitachi Ltd | Booster antenna |
| CN102930326A (en) * | 2011-08-12 | 2013-02-13 | 扬州稻源微电子有限公司 | Anti-metal radio frequency identification (RFID) tag and RFID system comprising tag |
| TW201724656A (en) * | 2015-12-31 | 2017-07-01 | Join Yiuh Industry Co Ltd | Metal resistant flexible radio frequency identification tag achieves well reading sensitivity and obtains long distance reading effect |
| CN106602284A (en) * | 2016-11-30 | 2017-04-26 | 南京邮电大学 | Small-scale metal-resistant broadband tag antenna |
| CN108321512A (en) * | 2017-01-18 | 2018-07-24 | 重庆邮电大学 | A kind of ultra wide band anti-metal UHF RFID label antennas with symmetrical structure |
| 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 |
Non-Patent Citations (2)
| Title |
|---|
| YEJUN HE ET AL.: "Design of UHF RFID Broadband Anti-metal Tag Antenna Applied on Surface of Metallic Objects", 《2013 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE(WCNC)：SERVICES & APPLICATIONS》 * |
| 景裕文 等: "一种柔性抗金属标签天线的设计", 《电子元件与材料》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113991283A (en) * | 2021-10-26 | 2022-01-28 | 福州大学 | Miniaturized anti-metal ultrahigh frequency RFID (radio frequency identification) tag antenna with folding structure |
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| Publication number | Publication date |
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| CN112216969B (en) | 2021-12-03 |
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