CN103049783A - Planar reflector with hollow structure - Google Patents
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- CN103049783A CN103049783A CN 201110315479 CN201110315479A CN103049783A CN 103049783 A CN103049783 A CN 103049783A CN 201110315479 CN201110315479 CN 201110315479 CN 201110315479 A CN201110315479 A CN 201110315479A CN 103049783 A CN103049783 A CN 103049783A
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Abstract
The invention discloses a planar reflector with a hollow structure, and the planar reflector is used for one side of an antenna, so that the antenna has a one-way characteristic; and the planar reflector with the hollow structure is characterized in that one side of the reflector is provided with the hollow structure. We can see that the reflector is provided with the hollow structure, so that the equivalent distribution inductance of the reflector is improved, the superposition of the reflective electromagnetic wave and the electromagnetic wave which is emitted by the antenna is adjusted and improved, and a one-way antenna effect which is similar to that achieved in a large size label can be achieved in a smaller label size.
Description
Technical field
The present invention relates to radio-frequency (RF) identification (RFID) technical field, particularly relate to a kind of planar reflector that is applied to electronic tag.
Background technology
Radio-frequency (RF) identification (Radio Frequency Identification, RFID) technology is a kind of contactless automatic identification technology, it is automatically identified destination object and obtains related data by radiofrequency signal, and identification work need not manual intervention, can work in various rugged surroundings.
Rfid system is a kind of simple wireless system, be used for control, detection and tracking object, it is comprised of two basic devices, be respectively interrogator (or reader) and transponder (or electronic tag), electronic tag mainly is made of the large scale integrated chip that has cognizance code and dual-mode antenna, wherein the quantity of electronic tag can be for a plurality of, and namely the RFID technology can be identified a plurality of electronic tags simultaneously.Its principle of work is: reader is launched the radio wave energy of a characteristic frequency to electronic tag, in order to drive the electronic tag circuit data of inside is sent, and this moment, reader just sequentially received unscrambling data, utilizes the application program in it to do corresponding processing.
At present, the working frequency range of definition RFID product has low frequency, high frequency and ultrahigh frequency, and wherein the RFID product of different frequency range has different characteristic and applications.Specific as follows:
RFID product in low frequency (frequency of operation is from 125KHz to the 135KHz) section mainly is to carry out work by the mode of inductive coupling, namely exists transformer coupled effect between read write line coil and inductor coil.The voltage of responding in the inductor antenna that acts on by the read write line alternating field is rectified, and can make supply voltage and use.Be mainly used in the management system, automobile burglar of animal husbandry and without application and gate inhibition and the safety management system etc. of key open-door system, marathon race system, automatic parking lot charge and vehicle management system, selfoiling system, hotel's door-locking system.
Inductor in high frequency (frequency of operation the is 13.56MHz) section no longer needs coil to carry out coiling, can make antenna by the mode of corrosion or printing.Inductor generally carries out work by the mode of load-modulate.Namely impel the voltage on the reading and writing device antenna to change by switching on and off of the pull-up resistor on the inductor, realize with the distance sensing device aerial voltage being carried out Modulation and Amplitude Modulation.The primary Management and application, three that is applied to clothing product line and logistics system is shown Management and application, convention personnel channel system, the management system of capital assets, the Management and application of Medical Logistics system and the management of intelligent commodity shelf etc. of pre-charge systems, hotel's door lock.
RFID in ultrahigh frequency (frequency of operation is that 860MHz is between the 960MHz) section comes transmitting energy by electromagnetic field, the energy decreases of electromagnetic field be not very fast, but the zone of reading is not fine the definition.It is distant that this frequency range reads distance, passive reaching about 10m.The antenna of its electronic tag generally is rectangular and label-like, and antenna has linear and two kinds of designs of circular polarisation, satisfies the demand of different application.Be mainly used in the Management and application on the supply chain, the Management and application of production line automation, Management and application, the Management and application of container and the application of logistics administration system etc. of air rail parcel.
At present, in taking care of books, and underuse the RFID technology, but adopt the mode of bar code or magnetic stripe to manage, need by originally reading in book information this moment, and human cost is larger.And introducing RFID technology, just there is following problem, because the antenna that the RFID electronic tag adopts does not possess obvious one-way, and library bookshelf is put by row placement at present, in needs read in front-seat bookshelf during book information, information in rear row's bookshelf also can be read into, thereby impact is to the statistics of book information in the front-seat bookshelf.
Consider the books of putting on the library bookshelf, always the spine direction is outside.If design a kind of plane unidirectional antenna, be applied in the RFID label, the maximum gain direction of RFID label plane unidirectional antenna is pointed to spine, then the RFID reader is easy to read the book labels on the current bookshelf; Simultaneously, because the book on the bookshelf of the back side is towards other direction, then these books are not easy to be misread by the RFID reader.
And for example, at the translational speed RFID label of the article on the streamline faster, its time that can distinguish scope by rfid interrogator is very short, may cause the situation of read-write operation failure.If the article on can the reasonable placement streamline make the maximum gain direction of label plane unidirectional antenna point to the read write line position, then can enlarge it and can distinguish scope, increase the fiduciary level of operation.
Yet, there is not at present the small and exquisite plane unidirectional antenna design of this convenience, what have only is a kind of Yagi antenna that is applied in other field, its directivity is fine.But structure is comparatively complicated, and size is larger, is not suitable for using in above field.
Specifically, as shown in Figure 1, it is a kind of existing Yagi antenna structural representation.This Yagi antenna is the end-fire antenna that is arranged in parallel and is formed by active dipole 11 (generally using folded dipole), passive reflector 12 and several passive directors 13.Typical Yagi antenna generally has three pairs of oscillators, and total is " king " font.The title active dipole that links to each other with feeder line, or main element occupy among three pairs of oscillators centre one horizontal stroke of " king " word.Reverberator is more a little longer than active dipole, and it is in a side of active dipole, plays a part to weaken the electric wave that transmits from this direction or the electric wave that goes from this antenna transmission; Director is slightly shorter than active dipole, and it is positioned at the opposite side of active dipole, and it can strengthen the electric wave that transmits from this side direction or launch to this direction.Director can have many, and every length is all shorter than its Na Genlve adjacent and close active dipole.Director is more, and direction is more sharp-pointed, gain is higher, but in fact surpasses after four, five directors, and this " benefit " increases just not too obvious, and volume is large, deadweight increases, the strength of materials is required the problems such as raising, cost increasing gradually outstanding.Generally there are secondary five unit Yagi spark gaps (three directors namely being arranged, a reverberator and an active dipole) just enough.Usually, each director and reverberator are to make with a metal bar.No matter what " unit " are arranged, and all oscillators all are to be fixed on one " crossbeam " by certain spacing is parallel.
As seen, above structure is not suitable for using in the Item Management on taking care of books and streamline, so, the present invention is directed to the RFID label in a kind of application of hyper band---" if it is fairly regular to label the laying for goods direction of RFID; and need label to have higher sensitivity on certain direction; do not wish on certain direction that perhaps label is detected " this realistic problem, the unidirectional antenna design of a kind of RFID label plane is proposed.
Summary of the invention
The object of the present invention is to provide a kind of planar reflector, be applied to flat plane antenna, to offset the radiation signal of antenna on a direction, realize the plane unidirectional antenna, to solve existing RFID label limitation problem of application in the Item Management etc. on taking care of books and streamline.
For solving above technical matters, the invention provides a kind of planar reflector, be used for a side of antenna, make antenna have unidirectional characteristic, wherein, this reflecting body one side has engraved structure.
Further, described engraved structure is long and narrow strip, and substantially parallel with the edge of a side of the reflecting body at its place.
Further, the width of described engraved structure and it are to the distance at the edge of a side of the reflecting body at its place mean breadth less than reflecting body.
Further, the width of described engraved structure and it to the edge of a side of the reflecting body at its place apart from sum less than reflecting body the narrowest width 1/2.
Further, has opening on the edge of a side of the reflecting body at its place of described engraved structure.
Further, the quantity of described engraved structure is one or more, and distributing position is followed the principle of even distribution and rotational symmetry distribution.
Further, described reflecting body is rectangle, and its width is more than the 4mm.
Further, the width of described reflecting body is 8～20mm.
Further, described reflecting body is axially symmetric structure, and from axis of symmetry to both sides, the width of reflecting body increases.
Further, from axis of symmetry to both sides, the width of described reflecting body increases gradually.
Further, a side of described reflecting body is arc.
Further, from axis of symmetry to both sides, the width of described reflecting body remains unchanged first, then increases gradually.
Further, the described linearity that increases to increases.
Further, the width at the axis of symmetry place of described reflecting body is more than the 4mm, and border width is greater than axis of symmetry place width.
Further, the width at the axis of symmetry place of described reflecting body is more than the 8mm, and border width is more than the 15mm.
Further, the material of described reflecting body is paper tinsel.
As seen, the above embodiment of the present invention utilizes reflecting body to offset radiation signal on direction of antenna, thereby realizes the unidirectional characteristic of antenna, and this antenna and reflecting body are planar structure, and then realized the plane unidirectional antenna, be conducive to it in the application of the aspects such as taking care of books.Specifically, utilize the reflecting body of widening to realize, can obviously reduce the antenna one-way performance to the dependence of frequency, make it in larger frequency range, keep unidirectional characteristic.Near 900MHz UHF RFID working frequency range, the above reflecting body width of 4mm can guarantee the above frequency adaptation scope of 100MHz (gain of antenna front and back differs more than the 6dB).As for the concrete start-stop frequency values of the frequency scope of application, can adjust to the distance of class dipole antenna and the length of reflecting body by the accommodation reflex body.
Further, preferred embodiment of the present invention utilize width therefrom the reflecting body that changes of mind-set both sides improve the overall dimensions requirement of above antenna and reflecting body.Specifically, utilize the umbilicate reflecting body of a side, can roughly in the constant situation, the overall width of reflecting body and antenna be reduced, thereby reach the effect of minimizing label overall dimensions at the mean distance that keeps reflecting body edge and antenna edge.
In addition, preferred embodiment of the present invention arranges engraved structure at reflecting body, increase the Equivalent Distributed inductance of reflecting body, regulating and to improve the electromagnetic stack situation that reflection electromagnetic wave and antenna itself send, thereby under less label sizes, obtain and unidirectional antenna effect like the large scale labels class.
Description of drawings
Fig. 1 is a kind of existing Yagi antenna structural representation;
The structural representation of the plane unidirectional antenna assembly that Fig. 2 provides for the embodiment of the invention one;
The structural representation of the plane unidirectional antenna assembly that Fig. 3 provides for the embodiment of the invention two;
The structural representation of the plane unidirectional antenna assembly that Fig. 4 provides for the embodiment of the invention three;
The structural representation of the plane unidirectional antenna assembly that Fig. 5 provides for the embodiment of the invention four;
The structural representation of the plane unidirectional antenna assembly that Fig. 6 provides for the embodiment of the invention five;
When Fig. 7 and Fig. 8 are respectively the class dipole antenna no reflection events body that uses on the common UHF RFID label, the antenna mode simulation result schematic diagram on E plane and the F plane of 920MHz;
Fig. 9 and Figure 10 are respectively class dipole antenna is other and place when widening reflecting body (the 150mm*20mm rectangle is apart from class dipole antenna 20mm), the antenna mode simulation result schematic diagram on E plane and the F plane of 920MHz;
It is crescent edge and during with the reflecting body of engraved structure that Figure 11 and Figure 12 are respectively in the other side of placing of class dipole antenna, the antenna mode simulation result schematic diagram on E plane and the F plane of 920MHz.
Embodiment
For purpose of the present invention, feature are become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is further described.
At aspects such as taking care of books and streamline object management, the laying for goods direction is fairly regular, and needs label to have higher sensitivity on certain direction, and does not wish that on other direction label is detected.If utilize in this case the plane unidirectional antenna, will effectively manage books or object information.Yet the RFID technology is not applied to this at present, mainly be not make things convenient for small and exquisite and preferably plane unidirectional antenna design of effect, and existing unidirectional antenna often is difficult to applicable this occasion.Therefore the present invention designs a kind of simple unidirectional label antenna, it is a kind of plane antenna structure, convenient in this field application, specifically, the reflecting body that has certain width the side vertical antenna direction setting of antenna, reduce the antenna one-way performance to the dependence of frequency, make it in larger frequency range, keep unidirectional characteristic.
Specifically, please refer to Fig. 2, the structural representation of the plane unidirectional antenna assembly that it provides for one embodiment of the invention.As shown in the figure, this antenna module comprises antenna 210 and reflecting body 220, and wherein reflecting body 220 is arranged at a side of antenna 210, and it has certain width W in the direction perpendicular to antenna 210.
With respect to the Yagi antenna of prior art, the width (namely strengthening the size perpendicular to antenna direction) of widening reflecting body can obviously reduce the antenna one-way performance to the dependence of frequency, makes it keep unidirectional characteristic in larger frequency range.In addition, it need not to arrange director, so that Antenna Design is simple, size is less, the convenient use.Near the UHF RFID working frequency range of above antenna module 900MHz, the above reflecting body width of 4mm can guarantee the above frequency adaptation scope of 100MHz (gain of antenna front and back differs more than the 6dB).As for the concrete start-stop frequency values of the frequency scope of application, can adjust to the distance of class dipole antenna and the length of reflecting body by the accommodation reflex body.Usually the increase of distance and size can make the start-stop frequency reduce, otherwise then makes its rising.
For the realization of unidirectional antenna, the wider effect of the width of reflecting body is better in theory, and infinitely-great width can bring infinitely-great frequency adaptation scope.But, too large width can cause the rising of cost, and what finally limit the label antenna size is the restriction of cost and concrete application scenarios.For this reason, use needs for the overall dimensions that guarantees antenna module satisfies, often the width of reflecting body is not higher than 20mm.
Better, because the size of dipole antenna is long and narrow and narrow, be fit to be complementary with the shape of reflecting body, therefore can be dipole antenna or class dipole antenna at this antenna.Certainly, the present invention is as limit, also can be the linear polarized antenna of the elongated shape used on other UHF RFID labels.
Better, the material of reflecting body is metal, for example, and paper tinsel.This is because the production procedure of existing general UHF RFID label antenna is made Copper Foil or etching aluminum foil at plastic sheeting.Reflecting body uses identical metal forming, does not then need to revise production procedure fully.Concerning the manufacturer, only be to have made a larger-size label.If label on printed electronic circuit board (PCB), then can with the shop copper of ground connection on the plate as reflecting body, not need to change production procedure here equally.
Embodiment one:
Please continue with reference to figure 2, as can be seen from the figure, reflecting body 220 is rectangle, its long edge antenna direction.
Need to prove, when reflecting body 220 more and more when the antenna 210, the front and back gain inequality can be more and more less, applicable frequency range (gain inequality is greater than the frequency range of certain certain threshold level namely) is more and more narrow, and gain inequality, these two parameters of frequency range are to surrounding enviroment more and more responsive (when namely the movement of objects of periphery or material change, may cause that these two parameters sharply change).For widening reflecting body 220 in the present embodiment, when the distance D at its Edge Distance label antenna edge is less than 10mm usually, just be difficult to obtain the effect of desirable unidirectional antenna.
For this reason, in order further to dwindle the size of whole antenna module, the overall dimensions of reflecting body 220 and antenna 210, following examples have provided more excellent reflector structure.
Embodiment two:
Because the structure of antenna is not key of the present invention, therefore, for the sake of clarity, omit antenna herein, and only provided the structure of reflecting body.
Please refer to Fig. 3, this antenna module comprises antenna and reflecting body 320 equally, and the difference of itself and embodiment one is, reflecting body 320 changes a side crescent reflecting body into by the rectangular reflection body, and namely this reflecting body 320 is arc near a lateral edges of antennas.Because depression in the middle of it, can roughly in the constant situation, the overall width of reflecting body and antenna be reduced, thereby reach the effect of minimizing antenna module overall dimensions at the mean distance that keeps reflecting body 320 edges and antenna edge.For example, the antenna module of the relative embodiment one of the antenna module of the present embodiment, overall width has reduced approximately 15mm.
Embodiment three:
Please refer to Fig. 4, this antenna module comprises antenna 310 and reflecting body 320 equally, and a side of this reflecting body 320 has engraved structure 330.Yet the present invention is not as limit.
The major function that increases engraved structure on the reflecting body is the Equivalent Distributed inductance that increases reflecting body, regulating and to improve the electromagnetic stack situation that reflection electromagnetic wave and antenna itself send, thereby assurance obtains and unidirectional antenna effect like the large scale labels class with less label sizes.
The position of engraved structure 330 is long and narrow strip in the side of reflecting body 320 near antenna, and direction is substantially parallel with reflecting body 320 edges of this side.The width of long and narrow strip hollow out and it should be less than the mean breadths of reflecting body to the distance at edge, specifically, the hollow out width add apart from the Edge Distance sum at least less than reflecting body the narrowest width 1/2, have a strong impact on to avoid engraved structure that other characteristics of reflecting body are caused.The length of long and narrow strip hollow out is the major parameter that affects the Equivalent Distributed inductance of engraved structure generation, should adjust length to the distance of antenna according to label antenna type, the reflecting body of concrete usefulness, so that it obtains desirable unidirectional antenna effect.
In addition, the quantity of the engraved structure 330 on the reflecting body 320 is any, and distributing position should be followed even distribution and symmetrical principle.
Specifically, for example when reflecting body was rectangle, engraved structure can be arranged on a long side of rectangle, and it is centered close on the rectangular symmetrical axle.Specifically such as following examples:
Embodiment four:
Because the structure of antenna is not key of the present invention, therefore, for the sake of clarity, omit antenna herein, and only provided the structure of reflecting body.
As shown in Figure 5, this reflecting body 420 is rectangle, and its width for example is 8mm to 20mm more than 4mm.Engraved structure 430 is positioned at a side on its long limit, and it is centered close on the axis of symmetry of rectangle, and extends to both sides along the long limit of rectangle.
Certainly, this is a kind of example, and engraved structure also can comprise a plurality of, is symmetrical arranged with respect to the axis of symmetry of rectangle.For example, engraved structure is two, is symmetricly set in the both sides of rectangular symmetrical axle; Engraved structure is odd number (for example, three), and one of them is centered close on the rectangular symmetrical axle, is symmetrically distributed in addition rectangular symmetrical axle both sides; Engraved structure is that even number (for example, two) is symmetrically distributed in rectangular symmetrical axle both sides.Those skilled in the art can select as required, and the present invention does not do any restriction.Same, the engraved structure among the embodiment two also can arrange in such a manner.
In addition, need to prove, reflecting body 320 1 sides among the embodiment two are crescent, yet the present invention is not as limit.Specifically, as long as the reflecting body center has depression, namely reflecting body is axially symmetric structure, and from axis of symmetry to both sides, the increase of the width of reflecting body gets final product, and when specifically using, namely a side of the close antenna of reflecting body is in the middle of two side direction, apart from the distance increase of antenna.This increase can be to increase gradually, also can increase by back segment.In addition, above marginal trough only forms in a side of reflecting body, and the present invention does not do any restriction to the structure of opposite side, and those skilled in the art can arrange as required, still be linear structure comparatively easily, can certainly be depression or the bulge-structure of correspondence.
Following examples have provided another kind of reflecting body and have realized form.
Embodiment five:
As shown in Figure 6, this reflecting body 520 is from axis of symmetry to both sides, and the width of reflecting body 520 remains unchanged first, then increase gradually, and this increases to linear increasing.A lateral edges that is reflecting body 520 is the isosceles trapezoid without long base.Certainly, the present invention is not as limit, and above increase also can not be linear increasing, and the edge that increases section also can be arc.
In addition, the width at the axis of symmetry place of reflecting body 520 is more than the 4mm, and border width is greater than the width at axis of symmetry place, and for example the width at axis of symmetry place is more than the 8mm, and border width is more than the 15mm.To satisfy the antenna unidirectional characteristic to the demand of reflecting body width.
It can also be seen that from figure, this reflecting body 520 also has engraved structure 530.Yet the present invention is not as limit.
This engraved structure 530 comprises three, and one of them is centered close on the axis of symmetry of reflecting body 520, and two other is symmetrically distributed in reflecting body 250 axis of symmetry both sides, specifically is positioned at the intersection both sides on isosceles trapezoid both sides and base.Yet the present invention is not as limit, and engraved structure can arrange arbitrarily as required, as long as follow even distribution and symmetrical principle.
As seen, the above embodiment of the present invention utilizes reflecting body to offset radiation signal on direction of antenna, thereby realizes the unidirectional characteristic of antenna, and this antenna and reflecting body are planar structure, and then realized the plane unidirectional antenna, be conducive to it in the application of the aspects such as taking care of books.Specifically, utilize the reflecting body of widening to realize, can obviously reduce the antenna one-way performance to the dependence of frequency, make it in larger frequency range, keep unidirectional characteristic.Near 900MHz UHF RFID working frequency range, the above reflecting body width of 4mm can guarantee the above frequency adaptation scope of 100MHz (gain of antenna front and back differs more than the 6dB).As for the concrete start-stop frequency values of the frequency scope of application, can adjust to the distance of class dipole antenna and the length of reflecting body by the accommodation reflex body.
Further, preferred embodiment of the present invention utilize width therefrom the reflecting body that changes of mind-set both sides improve the overall dimensions requirement of above antenna and reflecting body.Specifically, utilize the umbilicate reflecting body of a side, can roughly in the constant situation, the overall width of reflecting body and antenna be reduced, thereby reach the effect of minimizing label overall dimensions at the mean distance that keeps reflecting body edge and antenna edge.
In addition, preferred embodiment of the present invention arranges engraved structure at reflecting body, increase the Equivalent Distributed inductance of reflecting body, regulating and to improve the electromagnetic stack situation that reflection electromagnetic wave and antenna itself send, thereby obtain and unidirectional antenna effect like the large scale labels class less label sizes is little.
Accordingly, one embodiment of the invention also provides a kind of plane unidirectional antenna implementation method, and namely the side at antenna arranges reflecting body, and this reflecting body has certain width in the vertical antenna direction.Specifically, this reflecting body perpendicular to the width on the antenna direction more than 4mm.
The width (namely strengthening the size perpendicular to class dipole antenna direction) of widening reflecting body can obviously reduce the antenna one-way performance to the dependence of frequency, makes it keep unidirectional characteristic in larger frequency range.Near 900MHz UHF RFID working frequency range, the above reflecting body width of 4mm can guarantee the above frequency adaptation scope of 100MHz (gain of antenna front and back differs more than the 6dB).As for the concrete start-stop frequency values of the frequency scope of application, can adjust to the distance of class dipole antenna and the length of reflecting body by the accommodation reflex body.
In addition, distance between reflecting body and the antenna does not have obvious value range, when reflecting body more and more when the antenna, the front and back gain inequality can be more and more less, applicable frequency range (gain inequality is greater than the frequency range of certain certain threshold level namely) is more and more narrow, and gain inequality, these two parameters of frequency range are to surrounding enviroment more and more responsive (when namely the movement of objects of periphery or material change, may cause that these two parameters sharply change).
Widen reflecting body for rectangle, when its Edge Distance label antenna edge is less than 10mm usually, just be difficult to obtain the effect of desirable unidirectional antenna.After changing the umbilicate reflecting body of a side into, because depression in the middle of it, can roughly in the constant situation, the overall width of reflecting body and antenna be reduced, thereby reach the effect of minimizing label overall dimensions at the mean distance that keeps reflecting body edge and label antenna edge.For example, a side is meniscate reflecting body, and the label overall width has reduced approximately 15mm.
Please refer to Fig. 7 to Figure 12, when wherein Fig. 7 and Fig. 8 are respectively the class dipole antenna no reflection events body that uses on the common UHF RFID label, the antenna mode simulation result schematic diagram on E plane and the F plane of 920MHz; Fig. 9 and Figure 10 are respectively class dipole antenna is other and place when widening reflecting body (the 150mm*20mm rectangle is apart from class dipole antenna 20mm), the antenna mode simulation result schematic diagram on E plane and the F plane of 920MHz; It is crescent edge and with the reflecting body of engraved structure at present that Figure 11 and Figure 12 are respectively in the other side of placing of class dipole antenna, the antenna mode simulation result schematic diagram on E plane and the F plane of 920MHz.
As can be seen from the figure, after adding reflecting body, antenna mode demonstrates obvious unidirectional characteristic.Utilize simultaneously umbilicate reflecting body and can in the situation that dwindle the antenna physical dimension, still keep suitable unidirectional characteristic with the reflecting body of hollow out.
Above demonstration and described ultimate principle of the present invention, principal character and advantage of the present invention.Those skilled in the art should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and the instructions is principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the present invention.The protection domain that the present invention requires is defined by appending claims and equivalent thereof.
Claims (16)
1. planar reflector is used for a side of antenna, makes antenna have unidirectional characteristic, it is characterized in that, this reflecting body one side has engraved structure.
2. planar reflector according to claim 1 is characterized in that, described engraved structure is long and narrow strip, and substantially parallel with the edge of a side of the reflecting body at its place.
3. planar reflector according to claim 2 is characterized in that, the width of described engraved structure and it are to the distance at the edge of a side of the reflecting body at its place mean breadth less than reflecting body.
4. planar reflector according to claim 3 is characterized in that, the width of described engraved structure and it to the edge of a side of the reflecting body at its place apart from sum less than reflecting body the narrowest width 1/2.
5. planar reflector according to claim 1 is characterized in that, has opening on the edge of a side of the reflecting body at its place of described engraved structure.
6. planar reflector according to claim 1 is characterized in that, the quantity of described engraved structure is one or more, and distributing position is followed the principle of even distribution and rotational symmetry distribution.
7. planar reflector according to claim 1 is characterized in that, described reflecting body is rectangle, and its width is more than the 4mm.
8. planar reflector according to claim 7 is characterized in that, the width of described reflecting body is 8～20mm.
9. planar reflector according to claim 1 is characterized in that, described reflecting body is axially symmetric structure, and from axis of symmetry to both sides, the width of reflecting body increases.
10. planar reflector according to claim 9 is characterized in that, from axis of symmetry to both sides, the width of described reflecting body increases gradually.
11. planar reflector according to claim 10 is characterized in that, a side of described reflecting body is arc.
12. planar reflector according to claim 9 is characterized in that, from axis of symmetry to both sides, the width of described reflecting body remains unchanged first, then increases gradually.
13. planar reflector according to claim 12 is characterized in that, the described linearity that increases to increases.
14. planar reflector according to claim 9 is characterized in that, the width at the axis of symmetry place of described reflecting body is more than the 4mm, and border width is greater than axis of symmetry place width.
15. planar reflector according to claim 14 is characterized in that, the width at the axis of symmetry place of described reflecting body is more than the 8mm, and border width is more than the 15mm.
16. planar reflector according to claim 1 is characterized in that, the material of described reflecting body is paper tinsel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110315479 CN103049783A (en) | 2011-10-17 | 2011-10-17 | Planar reflector with hollow structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110315479 CN103049783A (en) | 2011-10-17 | 2011-10-17 | Planar reflector with hollow structure |
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| CN103049783A true CN103049783A (en) | 2013-04-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104978600A (en) * | 2015-07-16 | 2015-10-14 | 江苏中科易正电子科技有限公司 | Ultrahigh-frequency RFID (radio frequency identification) label and manufacturing method thereof |
| TWI677160B (en) * | 2018-01-18 | 2019-11-11 | 義守大學 | Wireless power transmission system |
| CN111146572A (en) * | 2019-12-20 | 2020-05-12 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Folding circular polarization reflective array antenna |
-
2011
- 2011-10-17 CN CN 201110315479 patent/CN103049783A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104978600A (en) * | 2015-07-16 | 2015-10-14 | 江苏中科易正电子科技有限公司 | Ultrahigh-frequency RFID (radio frequency identification) label and manufacturing method thereof |
| CN104978600B (en) * | 2015-07-16 | 2018-04-27 | 江苏中科易正电子科技有限公司 | Ultra-high frequency RFID label and preparation method thereof |
| TWI677160B (en) * | 2018-01-18 | 2019-11-11 | 義守大學 | Wireless power transmission system |
| CN111146572A (en) * | 2019-12-20 | 2020-05-12 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Folding circular polarization reflective array antenna |
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Application publication date: 20130417 |