CN1496019A - Doublet antenna, label and moving body recognition system using said doublet antenna - Google Patents
Doublet antenna, label and moving body recognition system using said doublet antenna Download PDFInfo
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- CN1496019A CN1496019A CNA031554431A CN03155443A CN1496019A CN 1496019 A CN1496019 A CN 1496019A CN A031554431 A CNA031554431 A CN A031554431A CN 03155443 A CN03155443 A CN 03155443A CN 1496019 A CN1496019 A CN 1496019A
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Abstract
To provide a dipole antenna that maintains directional characteristics as an antenna and at the same time, can easily perform adjustment in impedance. A pattern 15 for impedance adjustment is cut in the middle for gradually shortening a length (t), thus changing input impedance Z little by little for achieving the impedance matching between the dipole antenna 11 and an IC chip 17. The pattern 15 for impedance adjustment has a line shape with a narrow width, thus easily cutting the pattern 15 and hence easily adjusting the input impedance Z. Additionally, particularly making a dielectric substrate 12 large is not required, thus eliminating the need for making the size of the dipole antenna 11 large. Further, the directional characteristics in the dipole antenna 11 hardly fluctuate even if the length (t) is changed. (C)2004,JPO.
Description
Technical field
The present invention relates to the dipole antenna that a kind of radio communication uses, label (tag) and the moving body recognition system of using this dipole antenna.
Background technology
As dipole antenna, the small-sized dipole antenna that a pair of antenna element is formed as the figure on the dielectric base plate is for example arranged.This small-sized dipole antenna is built in the label that uses in the detection of article etc. or mobile electronic device etc.
In above-mentioned dipole antenna, in order to adjust its impedance, and change the dielectric constant or the thickness of dielectric base plate, perhaps change the width or the length of dipole antenna figure, perhaps dispose other figure of complete electric insulation abreast with dipole antenna.
In addition, the technology of adjusting impedance by the front end bending that makes antenna element is disclosed in patent documentation 1.
In addition, in patent documentation 2, disclose by and the connecting line of dipole antenna between the technology that impedance is adjusted in tap (stub) is set.
Patent documentation 1: special fair 4-12043 communique
Patent documentation 2: special fair 3-71807 communique
But, in above-mentioned any existing method, all be difficult to adjust at any time the impedance of dipole antenna, therefore can not be called as simple method of adjustment, and also be difficult to carry out the fine setting of impedance.
In addition, disposing abreast in the method for the method of other figure and patent documentation 1 and patent documentation 2 with dipole antenna, along with the adjustment of impedance, the directional property of antenna also may change, and it is extremely difficult carrying out the impedance adjustment in the directional property that keeps antenna.
Therefore, the present invention proposes in view of above-mentioned existing problem, and it is a kind of when keeping the antenna direction characteristic that its purpose is to provide, and can easily carry out the dipole antenna that impedance is adjusted.
In addition, the object of the present invention is to provide a kind of label and moving body recognition system of using the dipole antenna of the invention described above.
Summary of the invention
In order to address the above problem, dipole antenna provided by the invention, on dielectric, form a pair of antenna element, it is characterized in that, the wire impedance adjustment of the narrow width of ratio antenna element is connected with in a pair of antenna element at least one with figure as figure.
According to dipole antenna of the present invention with said structure, by the impedance adjustment is cut off therebetween with figure, change its length, can adjust the impedance of dipole antenna.Because impedance adjustment figure is the threadlike graph of the narrow width of ratio antenna element, thus carry out this cut-out easily, even and its length be changed, also can the directional property of antenna be exerted an influence hardly.
In addition, in the present invention, on position, the impedance adjustment is connected with antenna element with figure away from supply terminals.
Away from supply terminals, the current potential of antenna element is high more more.Therefore, the impedance adjustment is got over away from supply terminals with the link position of figure, and is obvious more with the impedance variation of the change of graphic length with respect to the impedance adjustment, thereby carries out the adjustment of impedance easily.
In addition, in the present invention, the impedance adjustment is connected with the front of antenna element with figure, the intermediate point of the length direction of this front ratio antenna element is further from supply terminals.
Like this, if the impedance adjustment is positioned at the front of antenna element with the link position of figure, and the length direction of this front ratio antenna element between further from supply terminals, then can carry out the adjustment of impedance easy as can.
In addition, in the present invention, a plurality of impedance adjustment are connected with antenna element with figure.
Like this, by connecting a plurality of impedance adjustment figures, can selectively change the length of each impedance adjustment with figure.
In addition, in the present invention, on dielectric, the impedance adjustment is disposed along antenna element with figure.Perhaps, on dielectric, make the impedance adjustment repeatedly crooked and dispose with figure.
If dispose impedance adjustment figure like this, then can reduce the occupied area of impedance adjustment with figure, suppress the maximization of dipole antenna.
In addition, in the present invention, be provided with near with figure to cut off to adjust in the impedance adjustment and use mark, so can easily adjust the length of impedance adjustment usefulness figure.
On the other hand, label of the present invention is connected semiconductor chip with the above-mentioned supply terminals of dipole antenna of the present invention, and above-mentioned semiconductor chip carries out data communication by dipole antenna.
According to label of the present invention, semiconductor chip is connected with the supply terminals of dipole antenna of the present invention with said structure.As mentioned above, owing to can easily adjust the impedance of dipole antenna,, keep the good reception of label to send performance so can easily realize the impedance matching between dipole antenna and the semiconductor chip.
In addition, moving body recognition system of the present invention has label of the present invention, and and above-mentioned label between carry out the read-write terminal device that Data Receiving sends.
According to moving body recognition system of the present invention, owing to use label of the present invention,, thereby make the function admirable of this system so the reception of label sends function admirable with said structure.
Description of drawings
Fig. 1 is the vertical view of an execution mode of expression dipole antenna of the present invention.
Fig. 2 is the end view of the dipole antenna of presentation graphs 1.
Fig. 3 is the input impedance Z of dipole antenna of presentation graphs 1 and the impedance adjustment curve chart with the relation between the length t of figure.
The vertical view of Fig. 4 state that to be illustration cut off the impedance adjustment of the dipole antenna of Fig. 1 therebetween with figure.
Fig. 5 is the curve chart of directional property of the dipole antenna of presentation graphs 1.
Fig. 6 is the vertical view of variation of the dipole antenna of presentation graphs 1.
Fig. 7 is the vertical view of another variation of the dipole antenna of presentation graphs 1.
Fig. 8 is the vertical view of another variation of the dipole antenna of presentation graphs 1.
Fig. 9 is the vertical view of another variation of the dipole antenna of presentation graphs 1.
Figure 10 is the block diagram of an execution mode of expression moving body recognition system of the present invention.
Embodiment
Following with reference to accompanying drawing, embodiments of the present invention are described.
Fig. 1 is the vertical view of an execution mode of expression dipole antenna of the present invention.Fig. 2 is the end view of this dipole antenna of expression.
The dipole antenna 11 of present embodiment is by etching etc., for example makes that covering dielectric substrate 12 whole lip-deep metal films are graphical, thereby forms a pair of antenna element 13,14 and impedance adjustment with figure 15 on dielectric base plate 12.
The thickness of dielectric base plate 12 is T, has relative dielectric constant Er.In addition, the whole back side of dielectric base plate 12 is covered by metal film 16.
Each antenna element 13,14 has the size of length L and width W respectively.The impedance adjustment is threadlike graphs of the narrow width of ratio antenna element 13,14 with figure 15, and as shown in Figure 1, the impedance adjustment is connected with the front end corner part of antenna element 14 with figure 15, in bent intermediate, disposes abreast with antenna element 13,14.
In addition, in this dipole antenna 11, dispose IC chip 17, ride over this IC chip 17 on the supply terminals between each antenna element 13,14 and connect.This IC chip 17 carries out data communication by dipole antenna 11.These dipole antennas 11 and IC chip 17 are housed in the shell (package) (not shown), thus configuration example such as label.Use in the moving body recognition system that this label illustrates in the back.
In order to make the input and output power maximum of IC chip 17, must realize the impedance matching (inpedance matching) between dipole antenna 11 and the IC chip 17.That is be Zc, if establish the conjugate impedance of the intrinsic impedance Zc (=Rc-jXc (Ω)) with respect to IC chip 17
*(=Rc+jXc (Ω)), the input impedance of dipole antenna 11 is Z (=R+jX (Ω)), then must make the input impedance Z and the conjugation impedance Z c of dipole antenna 11
*Consistent.Therefore, adjust the input impedance Z of dipole antenna 11.
The adjustment of the input impedance Z of dipole antenna 11 is carried out by the following method, is about to the impedance adjustment and cuts off therebetween with figure 15, changes the impedance adjustment length of figure 15 with respect to the coupling part of antenna element 14.
Fig. 3 is the input impedance Z of expression dipole antenna 11 and the curve chart that the relation between the length t of figure 15 is used in the impedance adjustment.In this curve chart, X-axis is represented the resistance components R (Ω) of input impedance Z, and Y-axis is represented the reactive component X (Ω) of input impedance Z, shows resistance components R (Ω) and resistance components X (Ω) along with the situation of change of impedance adjustment with the length t variation of figure 15.
As shown in Figure 3, when the length t that makes impedance adjustment usefulness figure 15 was elongated gradually from 0, resistance components R (Ω) and resistance components X (Ω) increased gradually.Along with impedance adjustment elongated with the length t of figure 15, after becoming maximum, resistance components R (Ω) reduces gradually.Equally, reduce gradually after reactive component X (Ω) also becomes maximum.But, on this curve chart, can't completely express resistance components R (Ω) on the A1 direction and the increase of reactive component X (Ω), so continue to show resistance components R that reduces gradually (Ω) and the reactive component X (Ω) that begins from the A2 direction.In addition, along with impedance adjustment elongated with the length of figure 15, near the value when resistance components R (Ω) and reactive component X (Ω) turn back to length t=0 respectively, and then the increase gradually by the inboard of initial track.
From this curve chart as can be seen, if change the length t of impedance adjustment, then can adjust the input impedance Z of dipole antenna 11 with figure 15.
Therefore, the impedance adjustment is cut off therebetween with figure 15, shortened length t gradually, change input impedance Z thus gradually, make itself and conjugation impedance Z c
*Unanimity, thus make impedance matching between dipole antenna 11 and the IC chip 17.
The vertical view of Fig. 4 state that to be illustration cut off the impedance adjustment therebetween with figure 15.The impedance adjustment is cut off at position P with figure 15, becomes length t2 from the original length t1.Under the situation of the original length t1, input impedance Z is big, and the sensitivity of dipole antenna 11 is low.Under the situation of the length t2 after the change, input impedance Z diminishes, and the sensitivity of dipole antenna 11 uprises.
Like this, in the present embodiment, cut off the impedance adjustment, change its length, thereby make the impedance matching between dipole antenna 11 and the IC chip 17 with figure 15.Wherein, because the impedance adjustment is threadlike graphs of narrow width with figure 15,, also can easily carry out the adjustment of input impedance Z so can easily carry out this cut-out.In addition, because the impedance adjustment is disposed with the upper edge of figure 15 along antenna element 14, so needn't make dielectric base plate 12 big especially, thus the maximization of dipole antenna 11 can not be caused.
In addition, because the impedance adjustment is threadlike graphs of narrow width with figure 15, so even change its length t, the directional property of dipole antenna 11 also can change hardly.
Fig. 5 is the curve chart of the directional property of expression dipole antenna 11.Because the impedance adjustment is much thin with figure 15 ratio antenna elements 14, so even change the length of impedance adjustment with figure 15, the directional property of this curve chart can not change yet.
In addition, as shown in Figure 4, can on dipole antenna 11, form the cut-out adjustment mark Q of scale shape in advance.By being pre-formed such cut-out adjustment mark Q, can be easy to the impedance adjustment of a plurality of dipole antennas is adjusted equably with the length of figure.Perhaps, use mark if form to cut off to adjust in advance on the sensitivity of dipole antenna 11 is roughly 0 position R, then by cut off impedance adjustment figure 15 at position R, the sensitivity adjustment that can be easy to dipole antenna 11 is 0.
In addition, even,, just can make the impedance adjustment return to original state, thereby recover input impedance Z with figure 15 as long as utilize scolding tin that this place of incision is coupled together cutting off the impedance adjustment with under the situation of figure 15.
In addition, if reduce the ratio L/W of length L with the width W of antenna element 14, then shown in the curve chart of Fig. 3, the characteristic curve of input impedance Z moves to the interior side direction of arrow C, in addition, if increase the ratio L/W of length L and width W, then the characteristic curve of input impedance Z is to the outer side shifting of arrow B.Therefore, can not make input impedance Z optimization if only change the impedance adjustment with the length of figure 15, then can be at the length L that changes antenna element 14 and the ratio L/W of width W, make after input impedance Z changes significantly, by changing the length of impedance adjustment, carry out the fine setting of input impedance Z once more with figure 15.
Fig. 6 shows the variation of the dipole antenna of Fig. 1.Wherein, the upper edge along antenna element 14 disposes impedance adjustment figure 15a.
Fig. 7 shows another variation of the dipole antenna of Fig. 1.Wherein, increased the width of each antenna element 13,14, along the right side edge configuration impedance adjustment figure 15b of antenna element 14.
Fig. 8 shows another variation of the dipole antenna of Fig. 1.Wherein, the impedance adjustment is disposed with many bendings of figure 15c.
In any one variation of Fig. 6, Fig. 7 and Fig. 8, the impedance adjustment is all very little with the occupied area of figure, therefore needn't make dielectric base plate 12 form very greatly, thereby can not cause the maximization of dipole antenna 11.
Fig. 9 shows another variation of the dipole antenna of Fig. 1.Wherein, use thin dielectric film 12a to replace dielectric base plate 12.Also can use paper wood or glass material to replace thin dielectric film 12a.
In addition, impedance adjustment figure is set on antenna element 13, perhaps on each antenna element 13,14, impedance adjustment figure is set all, also can obtain same effect.In addition, also a plurality of impedance adjustment can be connected with in the antenna element 13,14 at least one with figures, selectively change the length of each impedance adjustment usefulness figure, adjust the input impedance Z of dipole antenna 11.
In addition and since input impedance Z be by the impedance adjustment with the decision of the length of figure, and and the impedance adjustment with the direction of figure or impedance adjustment with the range-independence between figure and the antenna element, so can freely change the configuration of impedance adjustment with figure.Perhaps, also the impedance adjustment can be configured in the back side of dielectric base plate 12 with figure.
In addition, can make the shape of each antenna element 13,14 carry out various distortion.
In addition, as impedance adjustment figure, can a plurality of pattern piece are spaced apart and arrange, and with scolding tin etc. each pattern piece is connected, the impedance adjustment is connected with antenna element with figure, adjust the length of impedance adjustment usefulness figure simultaneously.
In addition, can change the impedance adjustment link position of figure with respect to antenna element.But because the current potential of part is low near the supply terminals of each antenna element 13,14, so even the impedance adjustment is connected with this part with figure, change the length of impedance adjustment with figure, small variation also only can take place in input impedance Z.Therefore, the impedance adjustment partly is connected with the antenna element that leaves supply terminals with figure.Particularly, if the impedance adjustment is connected with the front of antenna element with figure, this front than the intermediate point of the length direction of this antenna element further from supply terminals, then input impedance Z is bigger with the variation of the change of graphic length with respect to the impedance adjustment, thereby can adjust input impedance Z easy as can.
In addition, also can be by coaxial cable etc., other transmitter/receiver circuit etc. is connected with this supply terminals, connect to replace IC chip 17 is ridden on the supply terminals of dipole antenna 11.In mobile electronic device etc., and compare on the supply terminals that IC chip 17 is directly ridden over dipole antenna 11, draw methods such as coaxial cable from supply terminals and have more versatility.
Figure 10 is the block diagram of an execution mode of expression moving body recognition system of the present invention.The system of present embodiment has a plurality of label 21-1～21-n, and transmission receives data write terminal installation 22 separately between each label 21-1～21-n.
Each label 21-1～21-n is built in the dipole antenna 11 of Fig. 1 and IC chip 17 in the shell and forms.IC chip 17 carries out radio communication by dipole antenna 11, and read-write terminal device 22 between carry out data transmission receive.In addition, IC chip 17 has calculation function and memory function, can handle or store data.
In this system, each label 21-1～21-n is attached to respectively on the article (not shown), for each article, the inherent data with article sends to the IC chip 17 that is attached to the label on these article from read-write terminal device 22 respectively, makes the intrinsic information of IC chip 17 these article of storage.In addition,, call out the IC chip 17 that is attached to the label on the article from read-write terminal device 22 respectively, make the inherent data of IC chip 17 these article of transmission of the label of being called out, receive the intrinsic information of these article then by read-write terminal device 22 for each article.
Like this, by between each label 21-1～21-n and read-write terminal device 22, receiving the inherent data that sends each article, each article is managed.
In addition, in each label 21-1～21-n, adjust the length of impedance adjustment, carry out the impedance matching between dipole antenna 11 and the IC chip 17, make the input and output power maximum of IC chip 17 with figure.Thus, can carry out data communication between each label 21-1～21-n and the read-write terminal device 22 well.
In addition, as IC chip 17, can use battery-powered chip, perhaps use to receive electromagnetic wave signal, the input that is received is converted to electric energy.
According to the invention described above, by the impedance adjustment is cut off therebetween with figure, change its length, can adjust the impedance of dipole antenna.Because impedance adjustment figure is the threadlike graph of the narrow width of ratio antenna element, thus this cut-out carry out easily, even and its length be changed, also can the directional property of antenna be exerted an influence hardly.
In addition, because the impedance adjustment is connected with antenna element with figure,, thereby carry out the adjustment of impedance easily on away from the position of supply terminals so impedance phase is tangible for the impedance adjustment with the variation of the change of graphic length.
In addition, because at dielectric upper edge antenna element configuration impedance adjustment figure, perhaps on dielectric, make the impedance adjustment repeatedly crooked and dispose,, thereby can suppress the maximization of dipole antenna so the occupied area of impedance adjustment usefulness figure is little with figure.
In addition, use mark owing to be provided with near with figure to cut off to adjust in the impedance adjustment, thus can adjust the length of the impedance adjustment usefulness figure of a plurality of dipole antennas equably, and can be easily with the sensitivity adjustment of dipole antenna for being roughly 0.
Claims (9)
1. a dipole antenna forms a pair of antenna element as figure on dielectric, it is characterized in that,
To be connected with in the above-mentioned antenna element at least one with figure than the wire impedance adjustment of the narrow width of above-mentioned antenna element.
2. dipole antenna according to claim 1 is characterized in that, on the position away from supply terminals, above-mentioned impedance adjustment is connected with above-mentioned antenna element with figure.
3. dipole antenna according to claim 2 is characterized in that, above-mentioned impedance adjustment is connected with the front of above-mentioned antenna element with figure, this front than the intermediate point of the length direction of above-mentioned antenna element further from above-mentioned supply terminals.
4. dipole antenna according to claim 1 is characterized in that, a plurality of above-mentioned impedance adjustment are connected with above-mentioned antenna element with figure.
5. dipole antenna according to claim 1 is characterized in that, on above-mentioned dielectric, above-mentioned impedance adjustment is disposed along above-mentioned antenna element with figure.
6. dipole antenna according to claim 1 is characterized in that, on above-mentioned dielectric, makes above-mentioned impedance adjustment repeatedly crooked and dispose with figure.
7. dipole antenna according to claim 1 is characterized in that, is provided with near with figure to cut off to adjust in above-mentioned impedance adjustment and uses mark.
8. a label that uses dipole antenna is characterized in that, the above-mentioned supply terminals of any described dipole antenna of semiconductor chip and claim 1 to 7 is connected, and above-mentioned semiconductor chip carries out data communication by above-mentioned dipole antenna.
9. a moving body recognition system is characterized in that, has the described label of claim 8, and and above-mentioned label between carry out the read-write terminal device that Data Receiving sends.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002261697A JP3645239B2 (en) | 2002-09-06 | 2002-09-06 | Dipole antenna, tag and moving object identification system using the same |
| JP261697/2002 | 2002-09-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1496019A true CN1496019A (en) | 2004-05-12 |
| CN1287535C CN1287535C (en) | 2006-11-29 |
Family
ID=32261998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031554431A Expired - Fee Related CN1287535C (en) | 2002-09-06 | 2003-09-05 | Doublet antenna, label and moving body recognition system using said doublet antenna |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3645239B2 (en) |
| CN (1) | CN1287535C (en) |
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| CN111416204B (en) * | 2019-01-07 | 2023-04-07 | 北京京东乾石科技有限公司 | Ultrahigh frequency electronic tag and radio frequency identification system comprising same |
| CN113795977A (en) * | 2019-07-19 | 2021-12-14 | 大王制纸株式会社 | RFID tag, plastic bottle, and antenna |
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| JPS62122304A (en) * | 1985-11-21 | 1987-06-03 | Mitsubishi Electric Corp | Printed dipole antenna |
| JPH0412043A (en) * | 1990-04-27 | 1992-01-16 | Nippon Steel Chem Co Ltd | Hydraulic binder |
| JPH05299927A (en) * | 1992-04-21 | 1993-11-12 | Sony Corp | Information card |
| JP2531618Y2 (en) * | 1992-12-16 | 1997-04-09 | 八重洲無線株式会社 | Broadband printed antenna |
| JPH07131231A (en) * | 1993-11-05 | 1995-05-19 | Mitsubishi Cable Ind Ltd | Antenna for mobile communication equipment |
| JP2001217632A (en) * | 2000-01-31 | 2001-08-10 | Matsushita Electric Ind Co Ltd | Antenna and electronic equipment |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401580C (en) * | 2005-03-16 | 2008-07-09 | 方建兴 | Radio frequency antenna with longdistance identifying function |
| US7548167B2 (en) | 2005-07-29 | 2009-06-16 | Fujitsu Limited | RF tag and method of manufacturing the RF tag |
| CN101228664B (en) * | 2005-07-29 | 2011-04-06 | 富士通株式会社 | Radio frequency label and method for manufacturing the same |
| US8134505B2 (en) | 2005-07-29 | 2012-03-13 | Fujitsu Limited | RF tag and method of manufacturing the RF tag |
| CN101170215B (en) * | 2006-10-25 | 2011-12-28 | 日立电线株式会社 | Antenna and manufacturing method thereof |
| CN101785016A (en) * | 2007-08-13 | 2010-07-21 | 康宁光缆系统有限公司 | Antenna systems for passive RFID tags |
| CN101785016B (en) * | 2007-08-13 | 2014-10-29 | 康宁光缆系统有限公司 | Antenna systems for passive RFID tags |
| CN101425626B (en) * | 2007-10-30 | 2013-10-16 | 京信通信系统（中国）有限公司 | Wide-band annular dual polarized radiating element and linear array antenna |
| US9159012B2 (en) | 2009-11-30 | 2015-10-13 | Corning Incorporated | RFID condition latching |
| US9165232B2 (en) | 2012-05-14 | 2015-10-20 | Corning Incorporated | Radio-frequency identification (RFID) tag-to-tag autoconnect discovery, and related methods, circuits, and systems |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3645239B2 (en) | 2005-05-11 |
| JP2004104344A (en) | 2004-04-02 |
| CN1287535C (en) | 2006-11-29 |
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