CN103050786A - Planar one-way antenna assembly and realizing method thereof - Google Patents
Planar one-way antenna assembly and realizing method thereof Download PDFInfo
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- CN103050786A CN103050786A CN2011103153490A CN201110315349A CN103050786A CN 103050786 A CN103050786 A CN 103050786A CN 2011103153490 A CN2011103153490 A CN 2011103153490A CN 201110315349 A CN201110315349 A CN 201110315349A CN 103050786 A CN103050786 A CN 103050786A
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Abstract
The invention discloses a planar one-way antenna assembly and a realizing method thereof. A reflector is arranged on one side of an antenna, and has a certain width on a direction vertical to the antenna. The width of the reflector is increased (namely, the size of the reflector on the direction vertical to a dipole-similar antenna is increased) to ensure that the dependency of the antenna one-way performance to the frequency can be remarkably reduced so that the one-way characteristic is kept within a larger frequency range. In a UHF RFID (Ultra High Frequency Radio Frequency Identification) working frequency band near 900MHz, the width of more than 4mm of the reflector can ensure the frequency adaption range of more than 100MHz (the difference of gains before and behind the antenna is more than 6dB). The specific starting and ending frequency values of the frequency applicable range can be regulated through regulating the distance between the reflector and the dipole-similar antenna and the length of the reflector.
Description
Technical field
The present invention relates to radio-frequency (RF) identification (RFID) technical field, particularly relate to a kind of plane unidirectional antenna assembly and its implementation 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 adverse circumstances.
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 operation principle 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 hyperfrequency, and wherein the RFID product of different frequency range has different characteristic and applications.Specific as follows:
RFID product in low frequency (operating frequency is from 125KHz to the 135KHz) section mainly is to carry out work by the mode of inductance coupling high, 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 power 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 (operating frequency 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 load resistance 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 fixed 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 hyperfrequency (operating frequency is that 860MHz is between the 960MHz) section mainly 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 polarization, 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 reliability 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.Reflector 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 a little short 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 reflector and an active dipole) just enough.Usually, each director and reflector 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 plane unidirectional antenna assembly and its implementation, 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 problem, the invention provides a kind of plane unidirectional antenna implementation method, it comprises: the side at antenna arranges reflector, and this reflector has certain width in the vertical antenna direction.
Further, described reflector perpendicular to the width on the antenna direction more than 4mm.
Further, described reflector perpendicular to the width on the antenna direction below 20mm.
Further, adjust the start-stop frequency of the antenna frequencies scope of application to the length of the distance of antenna or reflector by the accommodation reflex body.
Further, described antenna is dipole antenna or class dipole antenna.
Further, described reflector is rectangle, its long edge antenna direction.
Further, described reflector on perpendicular to antenna direction, apart from the minimum range of antenna more than 10mm.
Further, a side of described reflector has engraved structure.
Further, a side of the close antenna of described reflector is in the middle of two side direction, apart from the distance increase of antenna.
Further, described reflector is arc near a lateral edges of antenna.
Further, described reflector is the isosceles trapezoid on the long base of nothing near a lateral edges of antenna.
The present invention also provides a kind of plane unidirectional antenna assembly, and it comprises: antenna; Reflector is arranged at antenna one side, and it has certain width perpendicular to antenna direction.
Further, described reflector perpendicular to the width on the antenna direction more than 4mm.
Further, described reflector perpendicular to the width on the antenna direction below 20mm.
Further, the start-stop frequency of the frequency scope of application of described antenna is adjusted to the distance of antenna or the length of reflector by the accommodation reflex body.
Further, described antenna is dipole antenna or class dipole antenna.
Further, described reflector is rectangle, its long edge antenna direction.
Further, described reflector on perpendicular to antenna direction, apart from the minimum range of antenna more than 10mm.
Further, a side of described reflector has engraved structure.
Further, a side of the close antenna of described reflector is in the middle of two side direction, apart from the distance increase of antenna.
Further, described reflector is arc near a lateral edges of antenna.
Further, described reflector is the isosceles trapezoid on the long base of nothing near a lateral edges of antenna
As seen, the above embodiment of the present invention utilizes reflector to offset radiation signal on direction of antenna, thereby realizes the unidirectional characteristic of antenna, and this antenna and reflector 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 reflector 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 reflector 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 reflector by the accommodation reflex body.
Further, preferred embodiment of the present invention utilize width therefrom the reflector that changes of mind-set both sides improve the overall dimensions requirement of above antenna and reflector.Specifically, utilize the umbilicate reflector of a side, can roughly in the constant situation, the overall width of reflector and antenna be reduced, thereby reach the effect of minimizing label overall size at the average distance that keeps reflector edge and antenna edge.
In addition, preferred embodiment of the present invention arranges engraved structure at reflector, increase the Equivalent Distributed inductance of reflector, 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;
Fig. 7 and Fig. 8 are respectively the class dipole antenna that uses on the common UHF RFID label when the areflexia body, the antenna mode simulation result schematic diagram on E plane and the F plane of 920MHz;
Fig. 9 and Figure 10 are respectively in that class dipole antenna is other and place when widening reflector (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 reflector 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.So 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 reflector that has one fixed width the setting of a side vertical antenna direction 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 reflector 220, and wherein reflector 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 reflector 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 reflector 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 reflector 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 reflector 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 reflector 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 reflector, so 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 reflector 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 film.Reflector 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 reflector, not need to change production procedure here equally.
Embodiment one:
Please continue with reference to figure 2, as can be seen from the figure, reflector 220 is rectangle, its long edge antenna direction.
Need to prove, when reflector 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 specific threshold 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 reflector 220 in the present embodiment, when the distance B 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 reflector 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, so, for the sake of clarity, omit antenna herein, and only provided the structure of reflector.
Please refer to Fig. 3, this antenna module comprises antenna and reflector 320 equally, and the difference of itself and embodiment one is that reflector 320 changes a side crescent reflector into by the rectangular reflection body, and namely this reflector 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 reflector and antenna be reduced, thereby reach the effect of minimizing antenna module overall size at the average distance that keeps reflector 320 edges and antenna edge.For example, the antenna module of the relative embodiment one of the antenna module of present embodiment, overall width has reduced about 15mm.
Embodiment three:
Please refer to Fig. 4, this antenna module comprises antenna 310 and reflector 320 equally, and a side of this reflector 320 has engraved structure 330.Yet the present invention is not as limit.
The major function that increases engraved structure on the reflector is the Equivalent Distributed inductance that increases reflector, 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 reflector 320 near antenna, and direction is substantially parallel with reflector 320 edges of this side.The width of long and narrow strip hollow out and it should be less than the mean breadths of reflector to the distance at edge, specifically, the hollow out width add apart from the Edge Distance sum at least less than reflector the narrowest width 1/2, have a strong impact on to avoid engraved structure that other characteristics of reflector 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 reflector of concrete usefulness, so that it obtains desirable unidirectional antenna effect.
In addition, the quantity of the engraved structure 330 on the reflector 320 is any, and distributing position should be followed even distribution and symmetrical principle.
Specifically, for example when reflector 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, so, for the sake of clarity, omit antenna herein, and only provided the structure of reflector.
As shown in Figure 5, this reflector 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 symmetry axis 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 symmetry axis 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 that reflector 320 1 sides among the embodiment two are crescent, yet the present invention is not as limit.Specifically, as long as the reflector center has depression, namely reflector is axially symmetric structure, and from symmetry axis to both sides, the increase of the width of reflector gets final product, and when specifically using, namely a side of the close antenna of reflector 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 reflector, 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 reflector and have realized form.
Embodiment five:
As shown in Figure 6, this reflector 520 is from symmetry axis to both sides, and the width of reflector 520 remains unchanged first, then increase gradually, and this increases to linear increasing.A lateral edges that is reflector 520 is the isosceles trapezoid without long base.Certainly, the present invention is not as limit, and more than increasing also can not be linear increasing, and the edge that increases section also can be arc.
In addition, the width at the symmetry axis place of reflector 520 is more than the 4mm, and border width is greater than the width at symmetry axis place, and for example the width at symmetry axis place is more than the 8mm, and border width is more than the 15mm.To satisfy the antenna unidirectional characteristic to the demand of reflector width.
It can also be seen that from figure this reflector 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 symmetry axis of reflector 520, and two other is symmetrically distributed in reflector 250 symmetry axis 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 reflector to offset radiation signal on direction of antenna, thereby realizes the unidirectional characteristic of antenna, and this antenna and reflector 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 reflector 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 reflector 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 reflector by the accommodation reflex body.
Further, preferred embodiment of the present invention utilize width therefrom the reflector that changes of mind-set both sides improve the overall dimensions requirement of above antenna and reflector.Specifically, utilize the umbilicate reflector of a side, can roughly in the constant situation, the overall width of reflector and antenna be reduced, thereby reach the effect of minimizing label overall size at the average distance that keeps reflector edge and antenna edge.
In addition, preferred embodiment of the present invention arranges engraved structure at reflector, increase the Equivalent Distributed inductance of reflector, 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 in that 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 reflector, and this reflector has certain width in the vertical antenna direction.Specifically, this reflector 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 reflector 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 reflector 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 reflector by the accommodation reflex body.
In addition, distance between reflector and the antenna does not have obvious value range, when reflector 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 specific threshold 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 reflector 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 reflector of a side into, because depression in the middle of it, can roughly in the constant situation, the overall width of reflector and antenna be reduced, thereby reach the effect of minimizing label overall size at the average distance that keeps reflector edge and label antenna edge.For example, a side is meniscate reflector, and the label overall width has reduced about 15mm.
Please refer to Fig. 7 to Figure 12, when wherein Fig. 7 and Fig. 8 are respectively the class dipole antenna areflexia 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 in that class dipole antenna is other and place when widening reflector (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 reflector 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.
As can be seen from the figure, after adding reflector, antenna mode demonstrates obvious unidirectional characteristic.Utilize simultaneously umbilicate reflector and can in the situation of dwindling the antenna physical dimension, still keep suitable unidirectional characteristic with the reflector of hollow out.
More than show and described basic 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 specification 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 range that the present invention requires is defined by appending claims and equivalent thereof.
Claims (22)
1. a plane unidirectional antenna implementation method is characterized in that, comprising:
Side at antenna arranges reflector, and this reflector has certain width in the vertical antenna direction.
2. plane according to claim 1 unidirectional antenna implementation method is characterized in that, described reflector perpendicular to the width on the antenna direction more than 4mm.
3. plane according to claim 2 unidirectional antenna implementation method is characterized in that, described reflector perpendicular to the width on the antenna direction below 20mm.
4. plane according to claim 1 unidirectional antenna implementation method is characterized in that, adjusts the start-stop frequency of the antenna frequencies scope of application to the length of the distance of antenna or reflector by the accommodation reflex body.
5. plane according to claim 1 unidirectional antenna implementation method is characterized in that described antenna is dipole antenna or class dipole antenna.
6. plane according to claim 1 unidirectional antenna implementation method is characterized in that described reflector is rectangle, its long edge antenna direction.
7. plane according to claim 6 unidirectional antenna implementation method is characterized in that, described reflector on perpendicular to antenna direction, apart from the minimum range of antenna more than 10mm.
8. plane according to claim 1 unidirectional antenna implementation method is characterized in that a side of described reflector has engraved structure.
9. plane according to claim 1 unidirectional antenna implementation method is characterized in that, described reflector, increases apart from the distance of antenna in the middle of two side direction near a side of antenna.
10. plane according to claim 9 unidirectional antenna implementation method is characterized in that, described reflector is arc near a lateral edges of antenna.
11. plane according to claim 9 unidirectional antenna implementation method is characterized in that, described reflector is the isosceles trapezoid on the long base of nothing near a lateral edges of antenna.
12. a plane unidirectional antenna assembly is characterized in that, comprising:
Antenna;
Reflector is arranged at antenna one side, and it has certain width perpendicular to antenna direction.
13. plane according to claim 12 unidirectional antenna assembly is characterized in that, described reflector perpendicular to the width on the antenna direction more than 4mm.
14. plane according to claim 12 unidirectional antenna assembly is characterized in that, described reflector perpendicular to the width on the antenna direction below 20mm.
15. plane according to claim 12 unidirectional antenna assembly is characterized in that the start-stop frequency of the frequency scope of application of described antenna is adjusted to the distance of antenna or the length of reflector by the accommodation reflex body.
16. plane according to claim 12 unidirectional antenna assembly is characterized in that, described antenna is dipole antenna or class dipole antenna.
17. plane according to claim 12 unidirectional antenna assembly is characterized in that described reflector is rectangle, its long edge antenna direction.
18. plane according to claim 17 unidirectional antenna assembly is characterized in that, described reflector on perpendicular to antenna direction, apart from the minimum range of antenna more than 10mm.
19. plane according to claim 12 unidirectional antenna assembly is characterized in that a side of described reflector has engraved structure.
20. plane according to claim 12 unidirectional antenna assembly is characterized in that, a side of the close antenna of described reflector is in the middle of two side direction, apart from the distance increase of antenna.
21. plane according to claim 20 unidirectional antenna assembly is characterized in that, described reflector is arc near a lateral edges of antenna.
22. plane according to claim 20 unidirectional antenna assembly is characterized in that,, described reflector is the isosceles trapezoid on the long base of nothing near a lateral edges of antenna.
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| CN2011103153490A CN103050786A (en) | 2011-10-17 | 2011-10-17 | Planar one-way antenna assembly and realizing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103715511A (en) * | 2013-12-31 | 2014-04-09 | 成都信息工程学院 | Micro-strip tag antenna |
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| US20100073142A1 (en) * | 2006-11-07 | 2010-03-25 | Inha-Industry Partnership Institute | Saw based chipless passive rfid tag using cellulose paper as substrate and method of manufacturing the cellulose paper |
| CN201112565Y (en) * | 2006-11-30 | 2008-09-10 | 上海坤锐电子科技有限公司 | High-performance Yagi electronic label antenna |
| CN101867093A (en) * | 2010-06-12 | 2010-10-20 | 湖南大学 | Ultrahigh frequency broadband quasi circular polarization micro-strip patch antenna |
| CN202282462U (en) * | 2011-10-17 | 2012-06-20 | 上海华虹计通智能系统股份有限公司 | Planar reflector |
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Application publication date: 20130417 |