CN105103088A - Apparatus and method for eliminating blind spot in RF antenna array - Google Patents
Apparatus and method for eliminating blind spot in RF antenna array Download PDFInfo
- Publication number
- CN105103088A CN105103088A CN201480004981.5A CN201480004981A CN105103088A CN 105103088 A CN105103088 A CN 105103088A CN 201480004981 A CN201480004981 A CN 201480004981A CN 105103088 A CN105103088 A CN 105103088A
- Authority
- CN
- China
- Prior art keywords
- antenna
- array
- blind spot
- label tag
- rfid label
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Near-Field Transmission Systems (AREA)
Abstract
The present invention provides an apparatus and method for eliminating blind spot of a high frequency RF antenna array, allowing an RFID tag to be detected when placed anywhere on top of and within the communication range of the RF antenna array. The RF antenna array includes a first array of RF antenna placed on a first surface and a second RF antenna placed on a second surface. The second RF antenna is located directly below or above the area encompassing borders of multiple antennas in the first array, but is not connected to any electrical path. Through the electromagnetic induction with the EM field generated by the first RF antenna array, a second EM field is formed by the second RF antenna, which enables detection and identification of the RFID tag placed on the blind spot of the first array of RF antenna. The present invention is useful in improving the RF communication range and accuracy of a passive RFID system.
Description
Technical field
The present invention relates to radio frequency (RF) aerial array for detecting radio-frequency (RF) identification (RFID) label.More particularly, the present invention relates to and eliminate the blind spot of high frequency RF antenna array so that detect be placed in RF aerial array communication range in, the RFID label tag of optional position above RF aerial array.
Background technology
Radio-frequency (RF) identification (RFID) technology has been widely used in the fields such as tracking, safety, transport, retail, industry and individual's identification.May be used for existence, the recognition object of inspected object by the data communication of RFID technique or obtain the data relevant to object.In rfid system, RFID label tag is additional on object, and wirelessly communicates with RFID reader.RFID reader drives multiple RF antenna usually, and detection and Identification are positioned at the RFID label tag of diverse location.
In passive RFID system, the antenna transmission RF signal of RFID reader activates the passive RFID tags within the scope of read-write.Once energy activated by RF, passive RFID tags will send response signal to RFID reader.RFID label tag obtains energy by the electromagnetic induction between the electromagnetic field (EMfield) that generated by RF antenna, and the communication range of RFID label tag depends on the intensity of electromagnetic field.For square RF antenna, due to cannot Net long wave radiation electromagnetic wave in antenna corner, the electromagnetic intensity around corner be more weak, therefore, if RFID label tag is placed on any one jiao near RF antenna, will be difficult to be detected and identification.
Therefore, for the RF aerial array with multiple antenna, in array, the borderline region of multiple RF antenna can be formed " blind spot ".Blind spot refers to a region of RF antenna array surfaces, and RFID label tag cannot be detected in this region.Meanwhile, other regions outside blind spot are placed in and the RFID label tag within the scope of the efficient communication of RF aerial array can be detected by aerial array.In fact, place between the surface of RFID label tag and the surface of RF aerial array and usually have certain distance.Under normal circumstances, this distance is larger, and blind spot is larger.
The invention provides the apparatus and method eliminating high frequency (13.56MHz) RF aerial array blind spot.
Summary of the invention
The invention provides the apparatus and method eliminating high frequency (13.56MHz) RF aerial array blind spot, RFID label tag is placed in the communication range of RF aerial array, above RF aerial array, and optional position can be detected.
According to one embodiment of present invention, high frequency RF antenna array comprises the first array of the RF antenna being positioned at first surface, the RFID reader be connected with a RF aerial array, and is positioned at the 2nd RF antenna of second surface.In the non-existent situation of the 2nd RF antenna, blind spot will be formed at the borderline region of multiple RF antennas of the first array.2nd RF antenna to be positioned at immediately below the first array blind spot or directly over, but be not connected with any electric pathway.High frequency RF antenna array also comprises the processor be operably connected with RFID reader.
According to one embodiment of present invention, once the RFID label tag that size is less than the antenna of a RF aerial array is placed on above blind spot surf zone or blind spot near surface region, and arrived by multiple antenna detection of the RF aerial array with the 2nd RF antenna overlapping, processor just determines that RFID label tag has been placed on above the 2nd RF antenna, even if the 2nd RF antenna is not electrically connected to RFID reader.This is contrary with following situation: if the 2nd RF antenna is removed, then the RFID label tag being positioned at same position can not be detected.Therefore, the design of described high frequency RF antenna array can without the passive RFID tags throughout array surface region in blind spot ground reading antenna communication range.
Purposes of the present invention be improve passive RFID system RF communication range and precision.
Accompanying drawing explanation
Fig. 1 is the schematic diagram illustrating that in RF aerial array, blind spot is formed according to one embodiment of present invention.
Fig. 2 A be high frequency RF antenna array for reading passive RFID tags is described according to one embodiment of present invention get a bird's eye view schematic diagram.
Fig. 2 B is the diagrammatic cross-section that the high frequency RF antenna array that each layer is separated is described according to one embodiment of present invention.
Embodiment
The present invention will describe in conjunction with specific embodiments, but the present invention is not limited in these specific embodiments.Persons of ordinary skill in the art will recognize that system and method for the present invention can use in other application a lot.The present invention try hard to cover allly in spirit and scope of the invention to substitute, amendment and equivalents, just as defined by the following claims.
In addition, in detailed description of the present invention, detail is set forth thoroughly to understand the present invention.But it is evident that, those of ordinary skill in the art can put into practice the present invention and need not understand detail.In other cases, known method, process, parts and circuit are not described in detail, unnecessarily fuzzy to clear understanding of the present invention to avoid.
By reference to accompanying drawing, to those skilled in the art, the present invention can be better understood, and its many objects and advantage will become obvious.
Fig. 1 is the schematic diagram illustrating that in RF aerial array, blind spot is formed according to one embodiment of present invention.As shown in Figure 1, RF aerial array 101 is embedded in a plane.For four antennas 102,103,104 and 105 being positioned at the array upper left corner, can see that these antenna is all designed to square, and each antenna is connected with RF reader (not showing in FIG).The representative dimensions of described antenna is 62mm × 62mm, and the distance normally 2mm between two RF antennas adjacent in array.Once RFID label tag 107 is placed on above antenna 102, RF aerial array can detect that it exists and identifies its position.But as explained before, if RFID label tag is placed on the place near RF antenna corner, the electromagnetic wave of there cannot Net long wave radiation, and RFID label tag just can not by the RF antenna detection in array and identification.Such as, once RFID label tag 108 is positioned over the borderline region 106 in RF antenna 102,103,104 and 105 corner, the blind spot of aerial array will be formed.Persons of ordinary skill in the art will recognize that blind spot also can occur in the adjacent boundary region of multiple RF antenna in the array different from the arrangement that this figure presents.Such as, each antenna is the two-dimensional array of hexagonal RF antenna, may form blind spot in the adjacent angular region of three antennas.Similarly, if the antenna of the first array is configured in the surface of three-dimensional instead of two dimension, blind spot may be formed in the space in multiple antenna corner.
The invention provides the apparatus and method of the blind spot of an elimination RF aerial array as shown in Figure 1.
Fig. 2 A be high frequency RF antenna array for reading passive RFID tags is described according to one embodiment of present invention get a bird's eye view schematic diagram.As shown in Figure 2 A, high frequency RF antenna array 201 comprises the first array of the high frequency RF antenna being positioned at the first plane, the RFID reader be connected with a RF aerial array, and is positioned at the 2nd RF antenna 206 of second surface.RF aerial array also comprises the processor (not showing in figure 3) being operably connected to RFID reader.
First array is made up of at least four square RF antennas, is such as positioned at the antenna 202,203,204 and 205 in the array upper left corner.If RFID label tag 210 is placed in the surf zone of aerial array, and only detected by antenna 202, processor is configured to determine that RFID label tag has been placed on above antenna 202., as described in before Fig. 1, in any case the blind spot of aerial array can be formed in four arm of angle boundary region of four RF antenna 202-205.Once RFID label tag 211 is placed on blind spot, RFID label tag would not be detected by any one in four RF antenna 202-205.
It is also square for placing the 2nd RF antenna 206 on a second surface, wherein immediately below each four adjacent angular borderline regions being arranged in the first array four RF antennas or directly over.The representative dimensions of the 2nd RF antenna is 22mm × 22mm, less than the size of a RF aerial array.2nd RF antenna is not connected to any network or electric pathway in any form.It is made up of coil and the such as electronic component such as electric capacity and resistance.Therefore, RFID label tag can not be detected separately by the second antenna, because the second antenna is not operably connected with RF reader or processor.But the electromagnetic induction between the electromagnetic field generated by a RF aerial array, the 2nd RF antenna generates the second electromagnetic field, and this second electromagnetic field is contrary with the electromagnetic field direction that a RF aerial array generates.Along with the formation of the second electromagnetic field, the 2nd RF antenna can reach the optimum resonance with a RF aerial array, thus enables the RF antenna detection and Identification of the first array be positioned at RFID label tag on the 2nd RF antenna.Once RFID label tag is placed on the surf zone of RF antenna first array, and recognized by multiple antennas of the first array, processor is configured to determine that RFID label tag has been placed on above the 2nd RF antenna.Therefore, this high frequency RF antenna array can without the passive RFID tags throughout array surface region in blind spot ground reading antenna communication range.
Such as, if RFID label tag 211 is placed on again on the surf zone of aerial array, and when the second antenna 206 exists, RFID label tag 211 is detected by all four antenna 202-205, then processor is configured to determine that RFID label tag has been placed on above the second antenna 206, i.e. four adjacent angular borderline regions of four RF antenna 202-205.This is contrary with following situation: if the 2nd RF antenna 206 is removed, the RFID label tag 211 being positioned at same position can not be detected, even if the 2nd RF antenna 206 is not electrically connected to RFID reader.One of skill in the art will recognize that this high frequency RF antenna array can without the passive RFID tags throughout array surface region in blind spot ground reading antenna communication range.
Fig. 2 B is the diagrammatic cross-section that the high frequency RF antenna array that each layer is separated is described according to one embodiment of present invention.From Fig. 2 B, bottom 207 is substrate or the substrate of high frequency RG aerial array.The first surface 209 being embedded with first day linear array is positioned on bottom 207.Is the second surface 208 being embedded with the 2nd RF antenna 206 between bottom 207 and first surface 209.Those of ordinary skill in the art can understand, and second surface 208 also can be placed on first surface 209.Therefore, each 2nd RF antenna 206 be placed in the first array blind spot immediately below or directly over.
Claims (8)
1. a high frequency RF antenna array, for reading without blind spot the passive RFID tags be in throughout described array surface region within the scope of antenna communication, comprising:
-be positioned at the first array of the RF antenna of first surface, be positioned at apart from described first surface certain distance when detection but when the RFID label tag of the communication range of the antenna of described first array, blind spot can be formed at the borderline region of multiple antennas of described first array,
-the RFID reader that is connected with the first array of described RF antenna,
-be positioned at the 2nd RF antenna of second surface, immediately below the blind spot being placed in described first array or directly over, wherein said 2nd RF antenna is not connected with any electric pathway.
2. RF aerial array according to claim 1, wherein, described first array comprises four larger square antennas, cause the blind spot forming described first array in four adjacent angular regions, and, the shape of wherein said 2nd RF antenna is less square, to be positioned at immediately below described first array blind spot region or directly over.
3. RF aerial array according to claim 1, also comprise: the processor be operably connected with RFID reader, wherein said processor is used for determining, then, described RFID label tag is placed on the top of described 2nd RF antenna to antenna detection relevant to blind spot in described RFID label tag is by described first array.
4. RF aerial array according to claim 2, also comprise: the processor be operably connected with RFID reader, wherein said processor is used for determining, when described RFID label tag by four antenna detection in described first array then, described RFID label tag is placed on the top of described 2nd RF antenna.
5. generate a method for high frequency RF antenna array, described high frequency RF antenna array can read without blind spot the passive RFID tags be in throughout described array surface region within the scope of antenna communication, comprising:
-the first array of high frequency RF antenna is placed on first surface, when the first array detection of described RF antenna is positioned at apart from described first surface certain distance but when the RFID label tag of the communication range of the antenna of described first array, can forms blind spot at the borderline region of multiple antenna;
-described first array is connected to RFID reader;
-the 2nd RF antenna is positioned over second surface, immediately below described first array blind spot or directly over, wherein said 2nd RF antenna is not connected with any electric pathway;
The RF antenna detection of-described first array relevant to blind spot is to the RFID label tag on the blind spot being placed on described first array.
6. method according to claim 5, wherein, described first array comprises four larger square antennas, and the shape of wherein said 2nd RF antenna is less square, to be positioned at immediately below described first array, four adjacent angular regions or directly over.
7. method according to claim 5, also comprise: the processor be operably connected with RFID reader is determined, when the multiple antenna detection relevant to blind spot in by described first array of described RFID label tag then, described RFID label tag is placed on the top of described 2nd RF antenna.
8. aerial array according to claim 6, also comprise: the processor be operably connected with RFID reader is determined, when described RFID label tag is by four antenna detection in described first array then, described RFID label tag is placed on the top of described 2nd RF antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201480004981.5A CN105103088A (en) | 2014-01-30 | 2014-12-12 | Apparatus and method for eliminating blind spot in RF antenna array |
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2014/071850 WO2014139349A1 (en) | 2013-03-12 | 2014-01-30 | System and method for identifying an object's id and location relative to an interactive surface |
| PCT/CN2014/072961 WO2014139369A1 (en) | 2013-03-12 | 2014-03-06 | System and method for identifying object's id and location relative to interactive surface |
| PCT/CN2014/079892 WO2015113359A1 (en) | 2013-03-12 | 2014-06-13 | System and method for identifying an object's id and location relative to an interactive surface |
| PCT/CN2014/080495 WO2015113365A1 (en) | 2014-01-30 | 2014-06-23 | System and method to recognize object's id, orientation and location relative to interactive surface |
| PCT/CN2014/093763 WO2015113446A1 (en) | 2014-01-30 | 2014-12-12 | Apparatus and method for eliminating blind spot in an rf antenna array |
| CN201480004981.5A CN105103088A (en) | 2014-01-30 | 2014-12-12 | Apparatus and method for eliminating blind spot in RF antenna array |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105103088A true CN105103088A (en) | 2015-11-25 |
Family
ID=54580971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480004981.5A Pending CN105103088A (en) | 2014-01-30 | 2014-12-12 | Apparatus and method for eliminating blind spot in RF antenna array |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105103088A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107657734A (en) * | 2017-10-30 | 2018-02-02 | 赵昕昱 | A kind of sales counter and its application method with commodity RFID identification plate |
| CN107680265A (en) * | 2017-10-30 | 2018-02-09 | 北京正众信源传媒科技有限公司 | A kind of sales counter and its application method |
| US10862569B2 (en) | 2019-04-22 | 2020-12-08 | Au Optronics Corporation | Wireless communication interface and driving method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM255524U (en) * | 2003-12-03 | 2005-01-11 | Tatung Co | Structure of laminated microstrip reflecting-array antenna |
| US20130257596A1 (en) * | 2012-03-30 | 2013-10-03 | Tyco Electronics Uk Ltd | Rfid reader extender |
| CN103384031A (en) * | 2012-05-03 | 2013-11-06 | 西门子公司 | Rfid reader antenna array structure and rfid reader |
-
2014
- 2014-12-12 CN CN201480004981.5A patent/CN105103088A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM255524U (en) * | 2003-12-03 | 2005-01-11 | Tatung Co | Structure of laminated microstrip reflecting-array antenna |
| US20130257596A1 (en) * | 2012-03-30 | 2013-10-03 | Tyco Electronics Uk Ltd | Rfid reader extender |
| CN103384031A (en) * | 2012-05-03 | 2013-11-06 | 西门子公司 | Rfid reader antenna array structure and rfid reader |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107657734A (en) * | 2017-10-30 | 2018-02-02 | 赵昕昱 | A kind of sales counter and its application method with commodity RFID identification plate |
| CN107680265A (en) * | 2017-10-30 | 2018-02-09 | 北京正众信源传媒科技有限公司 | A kind of sales counter and its application method |
| US10862569B2 (en) | 2019-04-22 | 2020-12-08 | Au Optronics Corporation | Wireless communication interface and driving method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9399174B2 (en) | Apparatus and method for eliminating blind spot in an RF antenna array | |
| US9214987B2 (en) | Near field antenna for object detecting device | |
| Kim et al. | Automated RFID-based identification system for steel coils | |
| US7474220B2 (en) | Three-dimensional radio frequency identification tag and environment condition recognition system and method using tag | |
| WO2015113446A1 (en) | Apparatus and method for eliminating blind spot in an rf antenna array | |
| US8947528B2 (en) | Container-classification identification using directional-antenna RFID | |
| EP3195283A1 (en) | Electronic article surveillance systems implementing methods for determining security tag locations | |
| WO2016106112A1 (en) | Rfid devices with multi-frequency antennae | |
| EP2879077A1 (en) | A conveyor system for identifying RFID tags on parcels | |
| CN105103088A (en) | Apparatus and method for eliminating blind spot in RF antenna array | |
| CN102800164A (en) | Rapid banking device and method for goods with electronic tag | |
| EP3238142B1 (en) | Using reactive coupling of a printed rfid chip on a strap to allow the printed material to be over-laminated with a barrier film against oxygen and moisture ingress | |
| EP2056232B1 (en) | Passively transferrring radio frequency signals | |
| US20170162952A1 (en) | Multi-loop antenna | |
| US9619681B2 (en) | Device detecting spatial variation of complex permittivity and system detecting presence/absence of article | |
| CN102629335B (en) | Method for raising RFID identification rate | |
| US9900058B2 (en) | Near-field UHF identification system and a method for identifying an object or the kind of an object that is or contains electrically conductive material using near-field identification | |
| JP6725407B2 (en) | Reading device and reading method | |
| US20120193433A1 (en) | Electromagnetic identification (emid) security tag | |
| KR101005311B1 (en) | Shelf-shaped rfid system comprising spiral antenna | |
| Hui et al. | EPC RFID technology for library applications | |
| EP3710988A1 (en) | Rfid transponder | |
| CN104102889A (en) | Positioning system and positioning method | |
| CN106779011B (en) | Method for designing ultrahigh frequency RFID security tag with bound physical properties | |
| KR100769295B1 (en) | Radio Frequency Identification Cubic Tag |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151125 |