CN105956650A - RFID label antenna with open-circuit line feeding structure - Google Patents
RFID label antenna with open-circuit line feeding structure Download PDFInfo
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- CN105956650A CN105956650A CN201610245102.9A CN201610245102A CN105956650A CN 105956650 A CN105956650 A CN 105956650A CN 201610245102 A CN201610245102 A CN 201610245102A CN 105956650 A CN105956650 A CN 105956650A
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- Prior art keywords
- antenna
- bending
- radiant body
- ring
- medium substrate
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/0772—Physical layout of the record carrier
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07773—Antenna details
-
- 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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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Details Of Aerials (AREA)
Abstract
The invention discloses an RFID label antenna with an open-circuit line feeding structure. The RFID label antenna comprises a dielectric substrate 1, a radiator 2, a bent ring 3 and a feeding chip 4. The radiator 2, the bent ring 3 and the feeding chip 4 are arranged on the front surface of the dielectric substrate 1. The radiator 2 is arranged at the middle part of the front surface of the dielectric substrate 1. The bent ring 3 is arranged at the periphery of the radiator 2 in a full surrounding manner. The feeding chip 4 is arranged above the radiator 2. The RFID label antenna has a structure that the periphery of the radiator 2 is totally surrounded by the bent ring 3. Compared with the structure of a traditional RFID antenna, the total surrounding structure has advantages of realizing compact structure, reducing area of the antenna, and increasing capacitive load of the antenna, thereby greatly expanding bandwidth of the antenna. The bandwidth of the antenna simultaneously covers two ultrahigh frequency bands of 840-845MHz and 920-925MHz. Simple structure and high robustness are realized.
Description
Technical field
The invention belongs to antenna technical field, relate to a kind of RFID label antenna using open-circuit line feed structure.
Background technology
Radio RF recognition technology (RFID, Radio Frequency Identification) is the noncontact utilizing RF-wise to carry out
Formula automatic identification technology, has the precision plurality of advantages such as by force high, adaptable, anti-interference.In recent years, along with low frequency and height
The RFID technique of frequency is gradually by commercialization widely, and hyperfrequency (840MHz～960MHz) REID is owing to identifying
Distance is remote, accuracy rate is high, speed is fast, has obtained paying close attention to widely.
One basic rfid system includes read write line, electronic tag and data management system 3 part.Wherein label antenna is
The critical component of rfid system, systematic function is had a great impact by the quality that it mates with chip impedance.The main property of label antenna
Index can include the reflection coefficient of power of antenna, size, reading/writing distance and the antenna compatibility etc. to institute's stuck object.
But in antenna Technology, the size of traditional antenna and function can not meet the miniature requirement of electronic equipment.
The volume of RFID antenna has become " bottleneck " of RFID electronic equipment size reduction, moreover RFID chip typically has little electricity
Resistance, the impedance operator of big capacitive reactance, mate, to antenna and chip, the biggest problem of bringing, and common antenna is often through powering up outward
Road realizes impedance matching, which increases the complexity of antenna structure.Additionally, RFID label tag to be made is used widely, mark
Label must reduce cost and convenient extensive manufacture, and this requires that label design must be the simplest, it is therefore desirable at grade.
Therefore design that a size is little, impedance matching easily, the RFID label antenna of simple in construction particularly important.
Summary of the invention
The invention provides a kind of RFID label antenna using open-circuit line feed structure, it is intended that overcome in prior art
The problem that RFID label antenna is oversize, impedance matching is complicated.
A kind of RFID label antenna using open-circuit line feed structure, including medium substrate 1, radiant body 2, bending ring 3 and
Feed chip 4；
Described radiant body 2, bending ring 3 and feed chip 4 may be contained within the front of medium substrate 1；
Described radiant body 2 is arranged in the middle of the front of medium substrate 1, and described bending ring 3 entirely surrounds and is arranged on radiant body 2 surrounding；
Described feed chip 4 is arranged at above radiant body 2.
The full mode compact conformation that surrounds, reduction antenna occupied area, increase the inductive load of antenna, so that the bandwidth of antenna has
Large increase, it is possible to simultaneously cover 840-845MHz and 920-925MHz two ultra-high frequency bands；
Described radiant body 2 both ends are circular, and pars intermedia is rectangle, half path length that the width of rectangle part is circular less than end
Degree.
Centre is rectangle, two ends be circular simple in construction and robustness good；
Described bending ring 3 is bending straight-flanked ring, and bending place is right angle, and bending ring mid portion caves inward, and bending ring one
The two ends of the female of side are connected with radiant body.
A length of 54-56mm of described bending straight-flanked ring, a width of 11-13mm, and bending straight-flanked ring live width be 1.5-2.5mm.
Described feed chip position square, the length of side is 2.4-2.6mm, is fixed in the middle of radiant body.
According to experimental measurements, with this antenna match best results when chip 4 is positioned at radiant body 2 position, middle.
The radius of the end circle of described radiant body is 2.1-3.2mm.
Described medium substrate 1 is rectangle, and the FR4 version using relative dielectric constant to be 4.4, thickness is 0.8mm.
Described medium substrate 1 is identical with the length of bending ring 3 and wide length.
Use identical length to arrange, can reach to save space, the effect minimum to guarantee antenna size.
Beneficial effect
The invention provides a kind of RFID label antenna using open-circuit line feed structure, including medium substrate 1, radiant body 2,
Bending ring 3 and feed chip 4；Described radiant body 2, bending ring 3 and feed chip 4 may be contained within the front of medium substrate 1；
Described radiant body 2 is arranged in the middle of the front of medium substrate 1, and described bending ring 3 entirely surrounds and is arranged on radiant body 2 surrounding；Institute
State feed chip 4 to be arranged at above radiant body 2.Propose bending ring 3 innovatively and be entirely surrounded on the structure around radiant body 2,
The top horizontal line of bending ring 3 connects the right and left square frame, and lower section horizontal line is symmetric position and radiant body phase below radiant body
Connect.Compared with the structure that tradition RFID antenna is used, the full mode not only compact conformation that surrounds, reduction antenna occupied area,
The more important thing is, this structure can increase the inductive load of antenna to a greater degree, carries the most greatly so that the bandwidth of antenna has had
High, it is possible to cover two ultra-high frequency bands of 840-845MHz and 920-925MHz simultaneously；Radiant body is by a rectangle and is positioned at
The circular composition of two of its two ends, simple in construction and robustness are good.
Utilize folding line technology to reduce antenna size, use open-circuit line feed structure to feed, can be by adjusting feed chip 4
Position adjust input impedance, by around radiant body plus bending ring structure load inductive load, the bandwidth of antenna
Can be greatly improved.It addition, use open-circuit line structure to feed, antenna is completely integrated in a plane, structure
Simply, cost of manufacture is significantly reduced.There is good resistance bandwidth (808-1049MHz), cover China 840-845MHz
With 920-925MHz ultra-high frequency band, radiation characteristic is good, is suitable for the application trend of label miniaturization.
Accompanying drawing explanation
Fig. 1 is the broadband UHF bending Dipole RFID Tag Antenna structural representation using open-circuit line feed structure；
Fig. 2 is the broadband UHF bending Dipole RFID Tag Antenna Parameter Map using open-circuit line feed structure；
Fig. 3 is the S11 curve chart of the broadband UHF bending Dipole RFID Tag Antenna using open-circuit line feed structure；
Fig. 4 is the antenna pattern of embodiment antenna；
Fig. 5 is the input impedance figure of embodiment antenna；
Label declaration: 1-medium substrate, 2-radiant body, 3-bends ring, and 4-feeds chip.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described further.
A kind of RFID label antenna using open-circuit line feed structure, including medium substrate 1, radiant body 2, bending ring 3 and
Feed chip 4；
Described radiant body 2, bending ring 3 and feed chip 4 may be contained within the front of medium substrate 1；
Described radiant body 2 is arranged in the middle of the front of medium substrate 1, and described bending ring 3 entirely surrounds and is arranged on radiant body 2 surrounding；
Described feed chip 4 is arranged at above radiant body 2.
The full mode compact conformation that surrounds, reduction antenna occupied area, increase the inductive load of antenna, so that the bandwidth of antenna has
Large increase, it is possible to simultaneously cover 840-845MHz and 920-925MHz two ultra-high frequency bands；
Described radiant body 2 both ends are circular, and pars intermedia is rectangle, half path length that the width of rectangle part is circular less than end
Degree, this simple in construction and robustness are good；
Described bending ring 3 is bending straight-flanked ring, and bending place is right angle, and bending ring mid portion caves inward, and bending ring one
The two ends of the female of side are connected with radiant body.
A length of 54-56mm of described bending straight-flanked ring, a width of 11-13mm, and bending straight-flanked ring live width be 1.5-2.5mm.
Described feed chip position square, the length of side is 2.4-2.6mm, is fixed in the middle of radiant body.
According to experimental measurements, with this antenna match best results when chip 4 is positioned at radiant body 2 position, middle.
The radius of the end circle of described radiant body is 2.1-3.2mm.
Described medium substrate 1 is rectangle, and the FR4 version using relative dielectric constant to be 4.4, thickness is 0.8mm.
Described medium substrate 1 is identical with the length of bending ring 3 and wide length.
Save space, to guarantee that antenna size is minimum.
Antenna structure is as it is shown in figure 1, corresponding parameter is as in figure 2 it is shown, parameter details are shown in Table 1.
Table 1 embodiment antenna parameter (unit: mm)
| L | W | L1 | L2 | L3 | L4 | d | Wk | R |
| 55 | 12 | 12 | 8 | 31 | 37 | 2 | 2.5 | 3.16 |
Antenna is printed on a size of 55 × 12 × 0.8mm3Medium substrate on 1, i.e. on FR4 substrate.Feed chip 4 is positioned at
Centre position on radiant body 2, can regulate the impedance matching of antenna by the position of regulation 4；Radiant body 2 and bending ring 3 are altogether
It is located on medium substrate 1, and bends ring 3 and be surrounded on around radiant body 2；Radiant body has a rectangle and is positioned at its two ends
Two circular compositions；The top horizontal line of bending ring connects the right and left square loop, and lower section horizontal line is symmetrical position below radiant body
Put and be connected with radiant body.
Use EPC Gen 2 chip of PHILIPS Co. at the present embodiment, when 900MHz, its testing impedance value is about 43+
j800Ω.Antenna Design is carried out under this frequency.
Fig. 3 is the broadband UHF bending Dipole RFID Tag Antenna return loss plot using open-circuit line feed structure.From figure
In it can be seen that Antenna Operation bin width is 241MHz (808-1049MHz), contain 840-845MHz and
Two hyperfrequency working frequency range of 920-925MHz.
Fig. 4 is the directional diagram that embodiment uses the broadband UHF bending Dipole RFID Tag Antenna of open-circuit line feed structure.From
It will be seen that this antenna has good radiation characteristic in figure: E face directional diagram is 8-shaped；H face directional diagram is rounded, has
Good omnidirectional's characteristic, i.e. directional is insensitive.
Fig. 5 is the input impedance that embodiment uses the broadband UHF bending Dipole RFID Tag Antenna of open-circuit line feed structure
Figure, when 900MHz, the imaginary part of this antenna is 815 Ω, and real part is about 44 Ω, mates well with actual chips.
The present invention utilizes folding line technology to reduce antenna size, uses open-circuit line feed structure to feed, and convenient adjustment inputs resistance
Anti-, by loading inductive load plus bending ring structure around radiant body, the bandwidth performance of antenna is greatly improved.
It addition, substitute short-circuit piece by introducing open-circuit line structure, antenna is completely integrated in a plane, and simple in construction drops effectively
Low cost of manufacture.There is good resistance bandwidth (808-1049MHz), cover China 840-845MHz and 920-925MHz
Ultra-high frequency band, radiation characteristic is good, is suitable for the application trend of label miniaturization.
Contrasting similar design, Hu Zhonghao et al. proposes the method for designing of folding line dipole antenna, is reduced to by area
42mm × 27mm, but the return loss characteristic of this design is not ideal [sees paper: " bend dipole RFID tag sky
Line design method research [J]. Computer Simulation, 2011,28 (1): 162～165 "]；China of Malaysia and China et al. devises a kind of bending label sky
Line structure, is reduced to antenna size 90mm × 60mm theoretically 67mm × 33mm, but area is the biggest [a kind of
Miniaturization uhf band bending label antenna [J]. University of Fuzhou's journal (natural science edition), 2013,41 (2): 182～185]；
In terms of impedance bandwidth more superior than similar design especially: L.Xu et al. propose ultra-wideband antenna half-power in free space
Bandwidth (return loss be less than-3dB) is that 102MHz (852-954MHz) [sees paper: " A Novel Broadband UHF
RFID Tag Antenna Mountable on Metallic Surface”,International Conference on Wireless
Communications,Networking&Mobile Computing.2007:2128-2131].It is new that A Ibrahiem et al. proposes
Type RFID UHF antenna input impedance bandwidth (return loss is less than-10dB) is that 87MHz (0.802 0.88GHz) [sees
Paper: " New design antenna for RFID UHF tags ", IEEE Antennas and Propagation Society
International Symposium,2006,pp.1355-1358]。
Although herein having been presented for some embodiments of the present invention, it will be appreciated by those of skill in the art that without departing from
In the case of spirit of the present invention, the embodiments herein can be changed.Above-described embodiment is exemplary, not Ying Yiben
The embodiment of literary composition is as the restriction of interest field of the present invention.
Claims (8)
1. the RFID label antenna using open-circuit line feed structure, it is characterised in that include medium substrate (1), radiation
Body (2), bending ring (3) and feed chip (4)；
Described radiant body (2), bending ring (3) and feed chip (4) may be contained within the front of medium substrate (1)；
Described radiant body (2) is arranged in the middle of the front of medium substrate (1), and described bending ring (3) is entirely surrounded and is arranged on radiation
Body (2) surrounding；
Described feed chip (4) is arranged at above radiant body (2).
Antenna the most according to claim 1, it is characterised in that described radiant body (2) both ends are circular, and pars intermedia is
Rectangle, the radius length that the width of rectangle part is circular less than end.
Antenna the most according to claim 2, it is characterised in that described bending ring (3) is bending straight-flanked ring, and bending place is equal
For right angle, bending ring mid portion caves inward, and the two ends of the female of bending ring side are connected with radiant body.
Antenna the most according to claim 3, it is characterised in that a length of 54-56mm of described bending straight-flanked ring, a width of
11-13mm, and bending straight-flanked ring live width be 1.5-2.5mm.
Antenna the most according to claim 3, it is characterised in that described feed chip position square, the length of side is 2.4-2.6mm,
It is fixed in the middle of radiant body.
Antenna the most according to claim 3, it is characterised in that the radius of the end circle of described radiant body is 2.1-3.2mm.
7., according to the antenna described in any one of claim 1-6, it is characterised in that described medium substrate (1) is rectangle, use
Relative dielectric constant is the FR4 version of 4.4, and thickness is 0.8mm.
Antenna the most according to claim 7, it is characterised in that described medium substrate (1) and the length and the width that bend ring (3)
Length identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610245102.9A CN105956650A (en) | 2016-04-19 | 2016-04-19 | RFID label antenna with open-circuit line feeding structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610245102.9A CN105956650A (en) | 2016-04-19 | 2016-04-19 | RFID label antenna with open-circuit line feeding structure |
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| CN105956650A true CN105956650A (en) | 2016-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610245102.9A Pending CN105956650A (en) | 2016-04-19 | 2016-04-19 | RFID label antenna with open-circuit line feeding structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106711598A (en) * | 2017-01-09 | 2017-05-24 | 中国计量大学 | Via hole bent miniaturized PCB_RFID antenna |
| CN107392297A (en) * | 2017-08-03 | 2017-11-24 | 深圳市融智兴科技有限公司 | Flexible anti-metal RFID and manufacture method |
| CN111416204A (en) * | 2019-01-07 | 2020-07-14 | 北京京东尚科信息技术有限公司 | Ultrahigh frequency electronic tag and radio frequency identification system comprising same |
| US12020099B2 (en) | 2021-09-07 | 2024-06-25 | Schreiner Group Gmbh & Co. Kg | Label with RFID function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090096214A (en) * | 2008-03-07 | 2009-09-10 | 건국대학교 산학협력단 | Rfid tag antenna |
| US20100007569A1 (en) * | 2006-12-04 | 2010-01-14 | Dong-Uk Sim | Dipole tag antenna structure mountable on metallic objects using artificial magnetic conductor for wireless identification and wireless identification system using the dipole tag antenna structure |
| CN101777693A (en) * | 2010-03-12 | 2010-07-14 | 浙江大学 | Ultrahigh frequency radio frequency identification anti-metal tag antenna with plane structure |
| CN104638356A (en) * | 2015-01-30 | 2015-05-20 | 董健 | Inductive coupling type equally-spaced bending dipole RFID (Radio Frequency Identification) tag antenna |
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2016
- 2016-04-19 CN CN201610245102.9A patent/CN105956650A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100007569A1 (en) * | 2006-12-04 | 2010-01-14 | Dong-Uk Sim | Dipole tag antenna structure mountable on metallic objects using artificial magnetic conductor for wireless identification and wireless identification system using the dipole tag antenna structure |
| KR20090096214A (en) * | 2008-03-07 | 2009-09-10 | 건국대학교 산학협력단 | Rfid tag antenna |
| CN101777693A (en) * | 2010-03-12 | 2010-07-14 | 浙江大学 | Ultrahigh frequency radio frequency identification anti-metal tag antenna with plane structure |
| CN104638356A (en) * | 2015-01-30 | 2015-05-20 | 董健 | Inductive coupling type equally-spaced bending dipole RFID (Radio Frequency Identification) tag antenna |
Non-Patent Citations (1)
| Title |
|---|
| 吴庭万等: "采用开路线馈电结构的宽带超高频RFID标签天线", 《移动通信》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106711598A (en) * | 2017-01-09 | 2017-05-24 | 中国计量大学 | Via hole bent miniaturized PCB_RFID antenna |
| CN107392297A (en) * | 2017-08-03 | 2017-11-24 | 深圳市融智兴科技有限公司 | Flexible anti-metal RFID and manufacture method |
| CN111416204A (en) * | 2019-01-07 | 2020-07-14 | 北京京东尚科信息技术有限公司 | Ultrahigh frequency electronic tag and radio frequency identification system comprising same |
| US12020099B2 (en) | 2021-09-07 | 2024-06-25 | Schreiner Group Gmbh & Co. Kg | Label with RFID function |
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