CN101118985A - Low temperature cofired ceramic antenna and very high frequency RF identification tag antenna formed of the same - Google Patents
Low temperature cofired ceramic antenna and very high frequency RF identification tag antenna formed of the same Download PDFInfo
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- CN101118985A CN101118985A CNA2007100583467A CN200710058346A CN101118985A CN 101118985 A CN101118985 A CN 101118985A CN A2007100583467 A CNA2007100583467 A CN A2007100583467A CN 200710058346 A CN200710058346 A CN 200710058346A CN 101118985 A CN101118985 A CN 101118985A
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Abstract
The invention relates to a low temperature co-firing ceramic antenna and a VHF(very high frequency) radio frequency identifying label antenna formed by the low temperature co-firing ceramic antenna. The antenna adopts the low temperature co-firing ceramic as a base plate and adopts metal wire to be printed on the low temperature co-firing ceramic base plate so as to from a needed shape. The VHF radio frequency identifying label antenna formed by the low temperature co-firing ceramic antenna comprises an L-shaped grounding metal wire which is printed on the low temperature co-firing ceramic base plate, a spiral micro strip eradiating unit which is connected with the L-shaped grounding metal wire, and a zigzag line shape feed-in metal wire which is connected at the connecting point of the L shape grounding metal wire and the spiral micro strip eradiating unit. The other end of the zigzag line shape feed in metal wire is the feeding line inputting end; the under layer of the L-shaped grounding metal wire, the spiral micro strip eradiating unit and the zigzag line shape feed in metal wire is provided with an under layer grounding metal plate which adopts the low temperature co-firing ceramic as a base plate; the other end of the L shape grounding metal wire is connected with the under layer grounding metal plate through a through hole between two layers. The present invention reduces the area of the antenna and reduces the wastage, which can realize the whole integration of the RFID label.
Description
Technical field
The present invention relates to a kind of RFID antenna.Particularly relate to a kind of under the situation that guarantees UHF RFID tag performance, can reduce antenna area greatly, improve antenna gain, reduce the wastage, and can realize that easily the low temperature cofired ceramic antenna that is complementary with load impedance reaches by its very high frequency RF identification tag antenna that constitutes by adjusting the size of feed-in metal wire and grounded metal line.
Background technology
Radio-frequency (RF) identification (RFID, being Radio Frequency Identification) technology is a kind of automatic identification technology from last century, the eighties moved to maturity, it carries out the noncontact two-way communication by RF-wise, thereby reaches identification and swap data purpose.Full-fledged along with the large scale integrated circuit technology, the volume of radio-frequency recognition system, particularly radio-frequency (RF) tag reduces greatly, therefore can be applicable to more wide field.
The performance of RFID label antenna directly has influence on the overall performance of system.Usually, in order to ensure the reliability that receives and transmit, label antenna must adopt omnidirectional antenna.In addition, the realization of antenna and application also are subjected to the restriction of factors such as cost, area and substrate material properties.Commercialization RFID label generally adopts flexible materials such as film and even plain paper as substrate, like this, because the dielectric constant of base material is low, loss is high, makes indexs such as the gain of antenna and size be difficult to have breakthrough.The gain of existing UHF RFID label antenna is usually less than 1.8, and area approximates IC-card area (8.5cm * 5cm), and manufacture craft and semiconductor integrated circuit technique are incompatible, can't realize fully integrated UHF RFID label.
In the UHF rfid system, the most normal use is dipole antenna.Its basic structure is arranged into straight line by two sections same thicknesses and isometric straight lead and constitutes.Signal produces certain CURRENT DISTRIBUTION from two end points feed-ins of centre on two arms of dipole, this CURRENT DISTRIBUTION can be in antenna surrounding space excitation electromagnetic field.Dipole antenna has good radiance, but the size of antenna is bigger, can not satisfy microminiaturized requirement.In order to reduce antenna size when omni-directional requires satisfying, dipole antenna can be deformed into the monopole structure, but because the monopole antenna longitudinal size is bigger, and there is certain degree of difficulty in impedance matching, so seldom in UHF RFID label, use.
The unipole antenna of the existing uhf band structures of falling F that adopt, it is developed by L type unipole antenna more.L type unipole antenna is the shape that unipole antenna is converted into L, and its advantage is to reduce the height of antenna.But its load impedance is lower, and there is certain difficulty in coupling.Therefore, in order to increase the input impedance of integrated antenna, the tail end of L type unipole antenna vertical component add one L shaped, simultaneously with tail end ground connection, promptly form the structure of falling F.
Fig. 1 is a printing inverse-F antenna structural representation.Inverse-F antenna is printed on the PCB substrate usually at present, but as if being used for 915MHz UHF RFID label in the substrate that it is produced on low-ks such as film and plain paper, high loss, then because its length is about the quarter-wave of resonance frequency, area is difficult to further reduce.
The LTCC technology adopts multilager base plate by low temperature co-fired formation density three-dimensional integrated circuit, not only can easily passive components such as resistance, electric capacity, inductance be embedded in the three-dimensional structure, and have the high-frequency and high-Q-value characteristic, can adapt to advantages such as big electric current and high temperature resistant application requirements.Compare with materials such as paper with film, the dielectric constant height of ltcc substrate material, loss is low, temperature stability is good, help the preparation of high performance antenna, solved the contradiction between UHF RFID label antenna performance and the area simultaneously, and established solid foundation, made the RFID technology can be applicable to more wide field for the fully integrated UHF RFID label of realization.
Summary of the invention
Technical problem to be solved by this invention is, provide a kind of under the situation that guarantees UHF RFID tag performance, can reduce antenna area greatly, improve antenna gain, reduce the wastage, and can realize that easily the low temperature cofired ceramic antenna that is complementary with load impedance reaches by its very high frequency RF identification tag antenna that constitutes by adjusting the size of feed-in metal wire and grounded metal line.
The technical solution adopted in the present invention is: a kind of low temperature cofired ceramic antenna, include LTCC and metal wire, and described LTCC is as substrate, and metal wire is printed on the antenna that constitutes required form on the low-temperature co-fired ceramic substrate.
Described metal wire and the LTCC that constitutes substrate be common to constitute a kind of in the antenna of the antenna of L shaped structure and tortuous linear structure.
Described metal wire and the common antenna that constitutes spiral yarn shaped structure of the LTCC that constitutes substrate.
A kind of very high frequency RF identification tag antenna that is made of low temperature cofired ceramic antenna includes: L shaped grounded metal line; The spiral shaped microstrip radiating element that is connected with L shaped grounded metal line; Be connected the tortuous linear feed-in metal wire at the tie point place of L shaped grounded metal line and spiral shaped microstrip radiating element, the other end of the linear feed-in metal wire of described complications is the feeder line input; Described L shaped grounded metal line, spiral shaped microstrip radiating element, tortuous linear feed-in metal wire all are printed on the substrate that is made of LTCC; Substrate lower floor at L shaped grounded metal line, spiral shaped microstrip radiating element, tortuous linear feed-in metal wire also is provided with the lower floor's grounding plate that is made of jointly LTCC and grounded metal, LTCC wherein is as substrate, and grounded metal is printed on the low-temperature co-fired ceramic substrate; Be connected with the lower floor grounding plate by the through hole between two-layer at the other end of L shaped grounded metal line.
The grounded metal that prints on the described lower floor grounding plate covers the following area until the feeder line input of spiral shaped microstrip radiating element.
Low temperature cofired ceramic antenna of the present invention reaches by its very high frequency RF identification tag antenna that constitutes, adopt the LTCC technology to realize a kind of UHF RFID label antenna that improves structure, under the situation that guarantees UHF RFID tag performance, reduced antenna area (reducing 70%) greatly than existing PCB printing inverse-F antenna, improved antenna gain (being about 3.1), reduced loss, and can realize easily being complementary by the size of adjusting feed-in metal wire and grounded metal line with load impedance.Adopt LTCC base antenna also can realize fully integratedization of RFID label.
Description of drawings
Fig. 1 is the PCB printing inverse-F antenna structural representation of prior art;
Fig. 2 is the structural representation of the very high frequency RF identification tag antenna based on LTCC Technology of the present invention.
Wherein:
1:L shape grounded metal line 2: the through hole between two-layer
3: tortuous linear feed-in metal wire 4: lower floor's grounding plate
5: feeder line input 6: spiral shaped microstrip radiating element
Embodiment
Below in conjunction with embodiment to low temperature cofired ceramic antenna of the present invention and making a detailed description by its very high frequency RF identification tag antenna that constitutes.
Low temperature cofired ceramic antenna of the present invention includes LTCC and metal wire, and described LTCC constitutes the substrate of metal wire, and metal wire is printed on the antenna that constitutes required form on the low-temperature co-fired ceramic substrate together jointly.
Described metal wire can constitute required shape arbitrarily jointly with the LTCC that constitutes substrate.As the antenna of the L shaped structure of common formation, or the antenna of tortuous linear structure, or the antenna of spiral yarn shaped structure etc.
As shown in Figure 2, the very high frequency RF identification tag antenna that is made of low temperature cofired ceramic antenna of the present invention includes: L shaped grounded metal line 1; The spiral shaped microstrip radiating element 6 that is connected with L shaped grounded metal line 1; Be connected the tortuous linear feed-in metal wire 3 at the tie point place of L shaped grounded metal line 1 and spiral shaped microstrip radiating element 6, the other end of the linear feed-in metal wire 3 of described complications is a feeder line input 5; Described L shaped grounded metal line 1, spiral shaped microstrip radiating element 6, tortuous linear feed-in metal wire 3 all are printed on the substrate that is made of LTCC; Substrate lower floor at L shaped grounded metal line 1, spiral shaped microstrip radiating element 6, tortuous linear feed-in metal wire 3 also is provided with the lower floor's grounding plate 4 that is made of jointly LTCC and grounded metal, LTCC wherein is as substrate, grounded metal is printed on the low-temperature co-fired ceramic substrate, and the grounded metal on the described lower floor grounding plate 4 covers spiral shaped microstrip radiating element area until feeder line input 5 below 6; Be connected with lower floor grounding plate 4 by the through hole between two-layer 2 at the other end of L shaped grounded metal line 1.
In an embodiment of the present invention, be to adopt LTCC (LTCC) fabrication techniques to be used for the antenna of 915MHz UHFRFID label, two-layer ltcc substrate, the thickness of every laminar substrate are 0.12mm.Little band metal wire live width of top substrate layer printing is 0.2mm.Following laminar substrate printing grounded metal, it is following until the feed side that metal will cover radiating element.In the LTCC three dimensional integrated circuits, can directly utilize metallic plate between isolated antennas and other element as the grounding plate of antenna.Therefore can under the situation that does not influence antenna performance, reduce the size of metallic plate as far as possible.The diameter that is used for the through hole that is connected between L shaped grounded metal line and the grounding plate in an embodiment of the present invention is 0.15mm.
The dielectric constant of LTCC material used in the present invention (Ferro A6-M) is 5.9 ± 0.3, and is bigger than the dielectric constant (2～3) of flexible substrate.Because antenna length is directly proportional with wavelength in the medium, so the increase dielectric constant can reduce antenna area effectively.In order further to reduce antenna length, antenna is made helix structure, feeder line is deformed into the meander line structure, though this distortion can make the frequency band mid point of antenna be offset, can easily band center be adjusted to desirable position by the length of adjusting L shaped grounded metal line and feeder line.Adopt silver as metallic conductor in the embodiments of the invention, make the antenna of making have higher quality factor.In addition, also can further the RFID label chip be inserted in the ltcc substrate, realize fully integrated UHF RFID label.
Claims (5)
1. a low temperature cofired ceramic antenna is characterized in that, includes LTCC and metal wire, and described LTCC is as substrate, and metal wire is printed on the antenna that constitutes required form on the low-temperature co-fired ceramic substrate.
2. low temperature cofired ceramic antenna according to claim 1 is characterized in that, described metal wire and the LTCC that constitutes substrate be common to constitute a kind of in the antenna of the antenna of L shaped structure and tortuous linear structure.
3. low temperature cofired ceramic antenna according to claim 1 is characterized in that, described metal wire and the common antenna that constitutes spiral yarn shaped structure of the LTCC that constitutes substrate.
4. a very high frequency RF identification tag antenna that is made of low temperature cofired ceramic antenna is characterized in that, includes: L shaped grounded metal line (1); The spiral shaped microstrip radiating element (6) that is connected with L shaped grounded metal line (1); Be connected the tortuous linear feed-in metal wire (3) at the tie point place of L shaped grounded metal line (1) and spiral shaped microstrip radiating element (6), the other end of the linear feed-in metal wires of described complications (3) is feeder line input (5); Described L shaped grounded metal line (1), spiral shaped microstrip radiating element (6), tortuous linear feed-in metal wire (3) all are printed on the substrate that is made of LTCC; Substrate lower floor at L shaped grounded metal line (1), spiral shaped microstrip radiating element (6), tortuous linear feed-in metal wire (3) also is provided with the lower floor's grounding plate (4) that is made of jointly LTCC and grounded metal, LTCC wherein is as substrate, and grounded metal is printed on the low-temperature co-fired ceramic substrate; The other end at L shaped grounded metal line (1) is connected with lower floor's grounding plate (4) by the through hole between two-layer (2).
5. the very high frequency RF identification tag antenna that constitutes by low temperature cofired ceramic antenna according to claim 4, it is characterized in that the grounded metal that described lower floor grounding plate (4) is gone up printing covers the following area until feeder line input (5) of spiral shaped microstrip radiating element (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710058346A CN101118985B (en) | 2007-07-20 | 2007-07-20 | Low temperature cofired ceramic antenna and very high frequency RF identification tag antenna formed of the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710058346A CN101118985B (en) | 2007-07-20 | 2007-07-20 | Low temperature cofired ceramic antenna and very high frequency RF identification tag antenna formed of the same |
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| CN101118985A true CN101118985A (en) | 2008-02-06 |
| CN101118985B CN101118985B (en) | 2012-10-03 |
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| CN200710058346A Expired - Fee Related CN101118985B (en) | 2007-07-20 | 2007-07-20 | Low temperature cofired ceramic antenna and very high frequency RF identification tag antenna formed of the same |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950857A (en) * | 2010-08-27 | 2011-01-19 | 电子科技大学 | Chip antenna based on LTCC ceramic medium |
| CN101546862B (en) * | 2008-03-28 | 2012-06-20 | 鸿富锦精密工业（深圳）有限公司 | Micro-strip antenna |
| CN101350447B (en) * | 2008-07-05 | 2012-08-22 | 中山达华智能科技股份有限公司 | Line-imbedding type UHF frequency band line-establishing antennae and UHF electronic label using the same |
| CN101707284B (en) * | 2009-11-20 | 2013-01-09 | 电子科技大学 | LTCC electrically small integrated antenna for radio-frequency front-end system |
| CN103515700A (en) * | 2013-09-27 | 2014-01-15 | 北京邮电大学 | RFID antenna |
| CN105161855A (en) * | 2015-09-28 | 2015-12-16 | 江苏大学 | 433 MHz miniaturization omnidirectional micro-strip antenna and manufacture method |
| CN109411877A (en) * | 2017-08-17 | 2019-03-01 | 元太科技工业股份有限公司 | Antenna assembly and electronic equipment |
| CN109919286A (en) * | 2019-01-25 | 2019-06-21 | 上海烨煊信息技术有限公司 | A kind of electronic tag |
| WO2021190333A1 (en) | 2020-03-24 | 2021-09-30 | 安川昌昭 | Electromagnetic wave transceiving apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020013673A (en) * | 2000-08-14 | 2002-02-21 | 우종명 | Surface-mounted multi-layered Chip Ceramic Dielectric antenna for PCS Phone |
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2007
- 2007-07-20 CN CN200710058346A patent/CN101118985B/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101546862B (en) * | 2008-03-28 | 2012-06-20 | 鸿富锦精密工业（深圳）有限公司 | Micro-strip antenna |
| CN101350447B (en) * | 2008-07-05 | 2012-08-22 | 中山达华智能科技股份有限公司 | Line-imbedding type UHF frequency band line-establishing antennae and UHF electronic label using the same |
| CN101707284B (en) * | 2009-11-20 | 2013-01-09 | 电子科技大学 | LTCC electrically small integrated antenna for radio-frequency front-end system |
| CN101950857B (en) * | 2010-08-27 | 2012-12-05 | 电子科技大学 | Chip antenna based on LTCC ceramic medium |
| CN101950857A (en) * | 2010-08-27 | 2011-01-19 | 电子科技大学 | Chip antenna based on LTCC ceramic medium |
| CN103515700B (en) * | 2013-09-27 | 2016-01-13 | 北京邮电大学 | A kind of RFID antenna |
| CN103515700A (en) * | 2013-09-27 | 2014-01-15 | 北京邮电大学 | RFID antenna |
| CN105161855A (en) * | 2015-09-28 | 2015-12-16 | 江苏大学 | 433 MHz miniaturization omnidirectional micro-strip antenna and manufacture method |
| CN109411877A (en) * | 2017-08-17 | 2019-03-01 | 元太科技工业股份有限公司 | Antenna assembly and electronic equipment |
| CN109919286A (en) * | 2019-01-25 | 2019-06-21 | 上海烨煊信息技术有限公司 | A kind of electronic tag |
| CN109919286B (en) * | 2019-01-25 | 2022-03-08 | 上海烨煊信息技术有限公司 | Electronic label |
| WO2021190333A1 (en) | 2020-03-24 | 2021-09-30 | 安川昌昭 | Electromagnetic wave transceiving apparatus |
| TWI754944B (en) * | 2020-03-24 | 2022-02-11 | 日本商英幸技術股份有限公司 | Electromagnetic wave transceiving apparatus |
| US11387562B2 (en) | 2020-03-24 | 2022-07-12 | Eiko Techno Corp | Electromagnetic wave transceiving apparutus |
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| CN101118985B (en) | 2012-10-03 |
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Granted publication date: 20121003 Termination date: 20130720 |