CN103715496A - Transmission line antenna applied to radio frequency identification - Google Patents
Transmission line antenna applied to radio frequency identification Download PDFInfo
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- CN103715496A CN103715496A CN201210371297.3A CN201210371297A CN103715496A CN 103715496 A CN103715496 A CN 103715496A CN 201210371297 A CN201210371297 A CN 201210371297A CN 103715496 A CN103715496 A CN 103715496A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/206—Microstrip transmission line antennas
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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
- H01Q1/2216—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 interrogator/reader equipment
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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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Abstract
The invention discloses a transmission line antenna applied to radio frequency identification. The transmission line antenna comprises a substrate and a conduction band. The conduction band is arranged on the substrate. The substrate and the conduction band form a transmission line. The width of the conduction band gradually decreases from the middle region of the conduction band to both sides, so that the reading void in an electric field of antenna radiation is reduced, and the reading distance is improved.
Description
Technical field
The present invention relates to radio-frequency (RF) identification (RFID, Radio Frequency Identification) technical field, the particularly transmission-line aerial of radio-frequency (RF) identification.
Background technology
Radio-frequency (RF) identification (RFID, Radio Frequency Identification) technology is a kind of contactless automatic identification technology, be commonly called as electronic tag, it is automatically identified destination object and is obtained related data by radiofrequency signal, and it comprises following element:
1, label (Tag), it is comprised of label antenna and chip, is attached on the object of being controlled, detecting or follow the tracks of, wherein, in rfid system, generally include a plurality of labels, each label has unique electronic code, in order to the object that sign quilt is controlled, detected or follow the tracks of uniquely; Here, label also can be called as transponder;
2, reader (Reader), it is for read/write tag canned data, can be hand-hold type or fixed, wherein in rfid system, generally include a reader, it reads canned data in each label (sometimes can also write label information to label), to realize control, detection or the tracking for the accompanying object of each label; Here, reader also can be called as interrogator;
3, antenna (Antenna), it connects reader, for transmit radiofrequency signal between each label and reader, with the transmission of information between reader and label.
At present, one of study hotspot of RFID technology is the application of single product (item-level) tag recognition, the especially application in retail business and pharmacy industry, such as: the intelligent commodity shelf based on RFID (Smart Shelves) or transfer system.User obtains and is positioned on shelf or the goods information of transfer system with the RFID reader that connects shelf or transfer system.
Near field (NF) hyperfrequency (UHF) RFID technology is mainly used in single grade tag recognition scenes such as intelligent commodity shelf or transfer system.In NF UHF RFID technical field, multiple transmission-line aerial (transmission line antenna) structure has been proposed to obtain the larger region of reading.Wherein, transmission-line aerial mainly comprises three kinds: microstrip line (microstrip transmission line) antenna, co-planar waveguide (coplanar waveguide) antenna and ground connection coplanar striplines (grounded coplanar stripline) antenna.In the application scenarios of intelligent commodity shelf, transmission-line aerial is placed on shelf, more than transmission-line aerial length can reach 1m, with the article of label, is conventionally placed on above transmission-line aerial.But the electric field of transmission-line aerial about 10cm eminence above transmission-line aerial just starts to occur several very dark cavities, this will have a strong impact on reading performance.Two kinds of existing microstrip line antenna structures have below been provided.
Fig. 1 shows a kind of microstrip line antenna.As shown in Figure 1, this antenna comprises: substrate (substrate) 101, ground level (groundplane) 102, conduction band 103, feeder line 104 and matched load 105.Wherein, XYZ coordinate axle has formed three-dimensional coordinate system; Ground level 102 is positioned under substrate 101, and it can be the conductive metal layer of substrate 101 lower surfaces; Conduction band 103 is arranged on substrate 101, along X-direction, runs through substrate 101, and it can be the conductive metal layer of substrate 101 upper surfaces; Substrate 101, ground level 102 and conduction band 102 form microstrip line; One end of microstrip line connects feeder line 104 to be connected with reader; The other end matching connection load 105 of microstrip line, electromagnetic wave, with traveling wave on microstrip line, has very wide bandwidth and very low far gain like this.Concrete connected mode about microstrip line and feeder line 104 and matched load 105 belongs to prior art category, herein this is not described.During this antenna work, label is positioned at the top (being the top of XZ axial plane) of antenna.When this microstrip line antenna applications is in intelligent commodity shelf, this microstrip line antenna is lain on shelf, substrate 101 can be identical or close along the length of X-axis with shelf along the length of X-axis, article with label are placed on this microstrip line antenna, in the time of in these article are reading distance, the electric field of this microstrip line antenna can cover these article with label, thereby reader can read the information of this label.
Yet the Electric Field Distribution of these the two kinds of microstrip line antennas shown in Fig. 1 and Fig. 2 all has problems.In the electric field of these two kinds of microstrip line antennas, all there is the more cavity of reading, cause it to read distance large not (be antenna Y direction the radiable maximum height without hole region).
In sum, rfid system needs a kind of transmission-line aerial at present, and it has the sufficiently long distance (reading the interior cavity that do not exist of distance at this) that effectively reads to guarantee the reading performance of antenna.
Summary of the invention
For addressing the above problem, the present invention proposes the transmission-line aerial in a kind of radio-frequency recognition system, its can reduce read cavity to obtain the sufficiently long distance that reads.
Transmission-line aerial in the radio-frequency recognition system that the present invention proposes, it comprises substrate and conduction band, and wherein said conduction band is arranged on described substrate, and described substrate and described conduction band form transmission line; The width of described conduction band reduces to both sides gradually from the zone line of conduction band, to reduce the cavity of reading in the electric field of aerial radiation, and then improves and reads distance.
Preferably, described antenna is symmetrical with respect to zone line, can further reduce cavity like this, and the size design of antenna is also simpler simultaneously.
In the transmission-line aerial according to one embodiment of the invention, further comprise: feeder line and matched load; One end of described transmission line connects described feeder line, and the other end connects described matched load.This kind of antenna is applicable to independent use, can reduce to read cavity, improve and to read distance.
In the transmission-line aerial according to one embodiment of the invention, the two ends of above-mentioned antenna comprise for two ports with other antenna cascade.This kind of antenna is applicable to the application scenarios of a plurality of antenna cascades, can reduce to read cavity, improve and to read distance.
In the transmission-line aerial according to one embodiment of the invention, further comprise: ground level; Described ground level is positioned under described substrate and covers whole substrate.Adopt ground level, can prevent the electromagnetic downward radiation of antenna completely, thereby make radiation signal upwards stronger.
In the transmission-line aerial according to one embodiment of the invention, described conduction band is formed by a plurality of conduction band fragment assemblies.Adopt this kind of scheme, by designing the size of each conduction band fragment, can reduce and read cavity so that read distance enough greatly, and processing technology is simple, is easier to design the size of conduction band.
In the transmission-line aerial according to one embodiment of the invention, described conduction band is formed by a plurality of conduction band fragment assemblies, and the length of the conduction band fragment in centre position and width are maximum.Adopt this kind of scheme, processing technology is simple, is easier to design the size of conduction band.
In the transmission-line aerial according to one embodiment of the invention, the adjacent boundary of every two adjacent conduction band fragments is parallel.Adopt this kind of scheme, the size design of conduction band fragment can be more simple, and disposing way is also more simple, and it is more easy therefore to implement.Preferably, described conduction band fragment is parallelogram.The size design of this kind of conduction band fragment can be relatively simple.
In the transmission-line aerial according to one embodiment of the invention, the belt body that described conduction band is integrated.Adopt this kind of scheme, the transition of conduction band width is more level and smooth, so reflection is less.
Can be for comprising the microstrip line antenna of above-mentioned any conduction band according to the transmission-line aerial of the embodiment of the present invention, or be the ground connection coplanar striplines antenna that comprises two above-mentioned any conduction bands.
The characteristic impedance of preferred above-mentioned conduction band fragment is identical.Adopt this kind of scheme, between the identical conduction band fragment of each characteristic impedance, can not produce reflected current, can obtain wider bandwidth.
Adopt transmission-line aerial provided by the present invention, in the application scenarios of radio-frequency recognition systems such as intelligent commodity shelf or transfer system, can reduce the cavity of reading of electric field that transmission-line aerial gives off, to guarantee the distance that reads of sufficient length.
Accompanying drawing explanation
To the person of ordinary skill in the art is more clear that above-mentioned and other feature and advantage of the present invention by describe exemplary embodiment of the present invention in detail with reference to accompanying drawing below, in accompanying drawing:
Fig. 1 is the structural representation of a kind of microstrip line antenna of the prior art;
Fig. 2 is the structural representation of another kind of microstrip line antenna of the prior art;
Fig. 3 is the structural representation of a kind of coplanar striplines antenna of inventor's proposition;
Fig. 4 is the Electric Field Distribution schematic diagram of coplanar striplines antenna shown in Fig. 3;
Fig. 5 is the structural representation according to the coplanar striplines antenna of one embodiment of the invention;
Fig. 6 is the Electric Field Distribution schematic diagram of coplanar striplines antenna shown in Fig. 5;
Fig. 7 is the simulation result schematic diagram of the S11 performance of coplanar striplines antenna shown in Fig. 5;
Fig. 8 is the structural representation according to the coplanar striplines antenna of another embodiment of the present invention;
Fig. 9 is the structural representation according to the microstrip line antenna of another embodiment of the present invention.
Embodiment
Below the mode with clearly understandable is also come the above-mentioned characteristic of the present invention, technical characterictic, advantage and implementation thereof to be further described by description of a preferred embodiment by reference to the accompanying drawings.
For aforementioned problems of the prior art, the inventor has done further experiment research, has proposed a kind of ground connection coplanar striplines antenna, as shown in Figure 3.Fig. 3 shows the long ground connection coplanar striplines antenna of a kind of 80cm, it at least comprises: substrate 301, ground level 302 and two conduction bands 303, wherein, XYZ coordinate axle has formed three-dimensional coordinate system, and substrate 301, ground level 302 and two conduction bands 302 form ground connection coplanar striplines; One end of ground connection coplanar striplines connects feeder line to be connected with reader; The other end matching connection load of ground connection coplanar striplines; In Fig. 3, fail other parts such as feeder line, matched load illustrating, belong to prior art category, do not describe here.As can be seen from Figure 3 the width of these two conduction band 303 main parts remains unchanged.
Adopt the antenna structure shown in Fig. 3, can significantly strengthen and read distance, but in its electric field, still have some cavities of reading.Fig. 4 shows through the Electric Field Distribution schematic diagram on XY axial plane of coplanar striplines antenna shown in the resulting Fig. 3 of emulation experiment.As shown in Figure 4, the coplanar striplines antenna shown in Fig. 3 can reach 1.3m along the scope of Y direction radiation, but its Electric Field Distribution is even not, and above substrate 301, several very dark cavities of reading have just appearred in 0.1m place, and it reads distance can only reach 0.1m.
Based on above experimental study, the present invention has designed a kind of transmission-line aerial, and it can give off uniform electric field, thereby reduces the cavity of reading shown in Fig. 4, guarantees the sufficiently long distance that reads.Wherein, the width of conduction band reduces to both sides gradually from zone line, can reduce like this cavity of reading in the electric field of aerial radiation, and then improve and read distance.
In the transmission-line aerial proposing in the present invention, the width of conduction band diminishes to both sides gradually from zone line, conduction band can be considered as to some fragments, and the conduction band segment width of zone line is maximum.It will be understood by those skilled in the art that in the situation that keeping certain characteristic impedance, along with the width of conduction band and the increase of length, more electric energy will, to outward leakage, strengthen the electric field of conduction band radiation.Like this, the conduction band fragment with Breadth Maximum is to extraradial electric field strength the strongest (the electromagnetic wave amplitude that is institute's radiation is maximum), and is distributed in electric field strength the reducing and weaken (the electromagnetic amplitude that is institute's radiation reduces) with its width of each conduction band fragment institute radiation of the conduction band fragment both sides of this width maximum.That is to say, in this transmission-line aerial structure that the present invention proposes, the electric field of conduction band fragment institute radiation with Breadth Maximum is the strongest, and the electric field of the conduction band fragment institute radiation of these conduction band fragment both sides weakens gradually.In transmission-line aerial provided by the invention, the electromagnetic wave amplitude difference that the conduction band fragment of different in width produces is larger, and in electromagnetic wave stack, electromagnetic wave can not offset completely like this, will reduce like this cavity of reading in electric field.
The transmission-line aerial that the present invention proposes can further comprise: feeder line and matched load; One end of transmission line connects feeder line and the load of other end matching connection.This kind of antenna is applicable to independent use, can reduce to read cavity, improve and to read distance.
The transmission-line aerial that the present invention proposes further comprises for two ports with other antenna cascade.This kind of antenna is applicable to the application scenarios of a plurality of antenna cascades, can reduce to read cavity, improve and to read distance.
The transmission-line aerial that the present invention proposes can further comprise: ground level, it is positioned under substrate and covers whole substrate.Adopt ground level, can prevent the electromagnetic downward radiation of antenna completely, thereby make radiation signal upwards stronger.
In a kind of transmission-line aerial providing in the embodiment of the present invention, described conduction band comprises a plurality of conduction band fragments, wherein, the width of conduction band fragment that is positioned at zone line is maximum, and the width from the conduction band fragment of described zone line to each conduction band fragment the two ends of described conduction band diminishes gradually.Adopt this kind of scheme, can reduce the cavity of reading in electric field, eliminate and read cavity even, to obtain enough distances that reads, and processing technology is simple, is easier to design the size of conduction band.The characteristic impedance of these conduction band fragments can be the same or different, preferably, by designing the size (comprising width and spacing) of each conduction band fragment, can make each conduction band fragment there is identical characteristic impedance, and then the boundary member (as 5024) between every two adjacent conduction band fragments there will not be reflected current.
The transmission-line aerial that the present invention proposes comprises two kinds: ground connection coplanar striplines antenna and microstrip line antenna.Fig. 5 shows the schematic diagram according to the ground connection coplanar striplines antenna of one embodiment of the invention.Fig. 5 shows the XZ axial plane of this ground connection coplanar striplines antenna, comprising: substrate 501 and two conduction bands 502.In this embodiment, whole transmission-line aerial is of a size of 932mm * 120mm * 21.5mm.Every conduction band is divided into 20 fragments.The width of middle conduction band fragment is 24.5mm, and the spacing on two conduction bands between the conduction band fragment of two centres is 45mm.The characteristic impedance of transmission line is 200 ohm (that is, the characteristic impedance of each conduction band fragment is 200 ohm), and the impedance of matched load is 50 ohm.The impedance ratio of Ba Lun is 1:4.Not shown other parts such as ground level, feeder line, matched load in Fig. 5, these parts and annexation thereof be all general technical staff according to prior art, be easy to just can learn, do not describe here.The embodiment of the present invention is improved the structure of these two conduction bands 502, as shown in Figure 5, the quadrangle conduction band fragment with identical characteristics impedance that every conduction band 502 is put by 20 orders forms, the characteristic impedance that is each conduction band fragment is 200 ohm, wherein, the width of middle conduction band fragment 5021 and length are all maximum, and the width that the conduction band fragment 5021 in the middle of is from then on taken office each conduction band fragment between the conduction band fragment 5022 or 5023 of one end reduces gradually.By designing the size of each conduction band fragment, can make each conduction band fragment there is identical characteristic impedance, and then the boundary member (as 5024) between every two adjacent conduction band fragments there will not be reflected current.Here, tetragonal conduction band fragment can be the various shapes such as parallelogram (such as rectangle, trapezoidal), and described width refers to the distance along Z-direction, and described length refers to the distance along X-direction.
Fig. 6 shows through the Electric Field Distribution schematic diagram on XY axial plane of coplanar striplines antenna shown in the resulting Fig. 5 of emulation experiment.As shown in Figure 6, the coplanar striplines antenna shown in Fig. 5 reads apart from more than can reaching 70cm along Y direction, and Electric Field Distribution is even, and above substrate 501, cavity does not also appear reading in 70cm place.Here, by designing the size of middle conduction band fragment, make its width and length enough large, can make antenna there is the sufficiently long distance that reads, can reduce even even to eliminate the cavity of reading in electric field.Can be each conduction band fragment design certain size in transmission-line aerial, by emulation experiment (such as by the analogous diagram of similar Fig. 6), judge whether the antenna of the conduction band fragment with this size can reduce and read cavity.
Fig. 7 is the simulation result schematic diagram of the S11 performance of coplanar striplines antenna shown in Fig. 5.Those skilled in the art can know, S11 is in S parameter, represent return loss characteristic, general by dB value and the impedance operator of its loss of network analyzer, this S11 parameter is used for evaluating the emission effciency of antenna, its value is larger, and the energy that expression antenna itself reflects is larger, and the efficiency of antenna is just poorer like this.As can see from Figure 7, even when S11 parameter is maximum-20dB (when antenna efficiency is the poorest), the bandwidth of antenna also can reach 800MHz ~ 1000MHz(higher than the basic demand of 200MHz).This explanation, the bandwidth of the coplanar striplines antenna shown in Fig. 5 can meet the demands completely.
In addition, by emulation, obtain the far gain of the coplanar striplines of ground connection shown in Fig. 5, only have-5dBi of its maximum far gain, obviously, this kind of ground connection coplanar striplines antenna is particularly suitable for the application scenarios near field, such as the intelligent commodity shelf based on RFID and transfer system.
The principle that realizes based on the coplanar striplines of ground connection shown in Fig. 5 antenna, the invention allows for the embodiment of another kind of ground connection coplanar striplines antenna, as shown in Figure 8.Ground connection coplanar striplines shown in Fig. 8 comprises substrate 801, two conduction bands 802.Unshowned other parts such as ground level, feeder line, matched load in Fig. 8, belongs to prior art category, does not describe here.The difference of the antenna structure shown in the antenna structure shown in Fig. 8 and Fig. 5 is, these two conduction bands 802 not consist of a plurality of tetragonal conduction band fragments, but two complete conduction bands of width gradual change and edge-smoothing, wherein, the mid portion width of every conduction band 802 is maximum, and the width that from then on mid portion is taken office the part between one end 8021 or 8022 reduces gradually.By designing the size of various piece in every conduction band 802, can make every conduction band 802 be divided into and there are the some parts of identical characteristic impedance, and the electric field strength of taking office these part institute radiation between one end 8021 or 8022 from mid portion weakens gradually, and then can reduce the cavity in electric field, obtain more uniform Electric Field Distribution.Here, described width refers to the width along Z-direction, and described length refers to the length along X-direction.
In the transmission-line aerial providing in the embodiment of the present invention, conduction band fragment can be various shapes, preferred, for such as rectangle, trapezoidal quadrangles such as parallelogram.Like this, the size design of conduction band fragment can be relatively simple.
Preferably, the adjacent boundary of every two adjacent conduction band fragments is parallel.Adopt the size design of this kind of scheme conduction band fragment can be more simple, disposing way be also more simple, and it is more easy therefore to implement.
In the transmission-line aerial providing in the embodiment of the present invention, above-mentioned conduction band can be formed by a plurality of conduction band fragment assemblies (such as, by a plurality of conductive metal sheets, be spliced), also can for the conduction band of a not segmentation of one (such as, be a conduction band sheet metal that one is complete).The edge of the conduction band that this is complete can be smoothed curve, also can the level and smooth broken line of right and wrong.Adopt this kind of scheme, the transition of conduction band width is more level and smooth, so reflection is less.
In the various transmission-line aerials that provide in the embodiment of the present invention, conduction band can be symmetric shape, can be also asymmetrical shape, and so-called conduction band is that symmetric shape refers to, conduction band is axisymmetric shape.Such as, at conduction band, along the midpoint of the length of X-direction, do one along the straight line of Z-direction, conduction band is to take the symmetric shape that this straight line is symmetry axis; Or, at conduction band, along the midpoint of the length of Z-direction, do one along the straight line of X-direction, conduction band is to take the symmetric shape that this straight line is symmetry axis.
Based on above embodiment, the invention allows for a kind of embodiment of microstrip line antenna.As shown in Figure 9, this microstrip line antenna comprises: substrate 901 and a conduction band 902.Not shown other parts such as ground level, feeder line, matched load in Fig. 9, these parts and annexation thereof be all general technical staff according to prior art, be easy to just can learn, do not describe here.The difference of the microstrip line antenna shown in the microstrip line antenna shown in Fig. 9 and Fig. 1 is the structure of conduction band.As shown in Figure 9, conduction band 902 is comprised of the conduction band fragment of some rectangles, and wherein, the width of middle conduction band fragment 9021 and length are all maximum, and the width that the conduction band fragment 9021 in the middle of is from then on taken office each conduction band fragment between one end 9022 or 9023 reduces gradually.By designing the size of each conduction band fragment, can obtain equally distributed radiated electric field.Here, by designing the size of middle conduction band fragment 9021, make its width and length enough large, can make antenna there is the sufficiently long distance that effectively reads.The shape of conduction band fragment is not limited to rectangle, can also be the various quadrangles such as trapezoidal, parallelogram, and described width refers to the width along Z-direction, and described length refers to the length along X-direction.
The principle that realizes based on the antenna of microstrip line shown in Fig. 9, the invention allows for the embodiment of another kind of microstrip line antenna, the antenna structure of this embodiment and the difference of the antenna structure shown in Fig. 9 are, conduction band not consists of a plurality of conduction band fragments, a but complete conduction band of width gradual change and edge-smoothing, wherein, the mid portion width of conduction band maximum (being wide part), and from then on mid portion reduces gradually to the width of the part between the arbitrary end of conduction band.By the size of various piece in design conduction band, conduction band can be divided into and there are the some parts of identical characteristic impedance, and the electric field strength of taking office these part institute radiation between one end from mid portion weakens gradually, and then can reduce and read cavity.
By accompanying drawing and preferred embodiment, the present invention has been carried out to detail display and explanation above, yet the invention is not restricted to the embodiment that these have disclosed, other scheme that those skilled in the art therefrom derive is also within protection scope of the present invention.
Claims (11)
1. for the transmission-line aerial of radio-frequency (RF) identification, it comprises substrate (101,201,301,501,801,901) and conduction band (502,802,902), wherein said conduction band (502,802,902) is arranged on described substrate (101,201,301,501,801,901) on, described substrate (101,201,301,501,801,901) and described conduction band (502,802,902) form transmission line;
The width of described conduction band (502,802,902) reduces to both sides gradually from the zone line of conduction band (502,802,902), to reduce the cavity of reading in the electric field of aerial radiation.
2. antenna according to claim 1, further comprises feeder line (104,204) and matched load (105,205), and one end of described transmission line connects described feeder line (104,204), and the other end connects described matched load (105,205).
3. antenna according to claim 1, the two ends of this antenna comprise for the port with other antenna cascade.
4. antenna according to claim 1, further comprises ground level (102,202,302); Described ground level (102,202,302) is positioned under described substrate (101,201,301,501,801,901), and covers whole substrate (101,201,301,501,801,901).
5. according to the transmission-line aerial described in any one in claim 1-4, wherein, described transmission line is the microstrip line that comprises a described conduction band (902), or for comprising the ground connection coplanar striplines of two described conduction bands (502,802).
6. according to the transmission-line aerial described in claim 1 to 4 any one, wherein, the belt body that described conduction band (802) is integrated.
7. according to the transmission-line aerial described in claim 1 to 4 any one, wherein, described conduction band (502,902) is formed by a plurality of conduction band fragment assemblies.
8. transmission-line aerial according to claim 7, wherein, the length of the conduction band fragment in centre position and width are all maximum.
9. transmission-line aerial according to claim 7, wherein, the adjacent boundary of every two adjacent conduction band fragments (5024) is parallel.
10. transmission-line aerial according to claim 9, wherein, described conduction band fragment is parallelogram.
11. transmission-line aerials according to claim 7, the characteristic impedance of wherein said a plurality of conduction band fragments is identical.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210371297.3A CN103715496B (en) | 2012-09-28 | 2012-09-28 | Transmission-line aerial in RF identification |
| EP13185656.9A EP2713441A1 (en) | 2012-09-28 | 2013-09-24 | Transmission line antenna for radio frequency identification |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210371297.3A CN103715496B (en) | 2012-09-28 | 2012-09-28 | Transmission-line aerial in RF identification |
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| CN103715496A true CN103715496A (en) | 2014-04-09 |
| CN103715496B CN103715496B (en) | 2016-12-21 |
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| EP3446364B1 (en) | 2016-04-21 | 2020-05-20 | Veoneer Sweden AB | A leaky-wave slotted microstrip antenna |
| KR101993912B1 (en) * | 2016-09-08 | 2019-06-27 | 경상대학교산학협력단 | Near-field microstrip antenna |
| GB201708811D0 (en) * | 2017-06-02 | 2017-07-19 | Smart Antenna Tech Ltd | Reconfigurable half-width leaky-wave antenna |
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| Publication number | Publication date |
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| CN103715496B (en) | 2016-12-21 |
| EP2713441A1 (en) | 2014-04-02 |
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