CN201112565Y

CN201112565Y - High-performance Yagi electronic label antenna

Info

Publication number: CN201112565Y
Application number: CNU2006200483116U
Authority: CN
Inventors: 菅洪彦
Original assignee: KUNRUI ELECTRONIC SCIENCE-TECHNOLOGY Co Ltd SHANGHAI
Current assignee: KUNRUI ELECTRONIC SCIENCE-TECHNOLOGY Co Ltd SHANGHAI; Shanghai Quanray Electronics Co Ltd
Priority date: 2006-11-30
Filing date: 2006-11-30
Publication date: 2008-09-10
Anticipated expiration: 2016-11-30

Abstract

The utility model provides a high-performance electronic tag antenna, which applies a yagi antenna structure, uses a dipole as an active pole, and is provided with a passive oscillator to form a yagi electronic tag with two units. The high-performance electronic tag antenna inherits the strong orientation and high grain characteristics of the yagi antenna, and improves the performance of electronic tags.

Description

A kind of high performance Yagi spark gap electronic label antenna

Technical field

The utility model relates to a kind of high performance Yagi spark gap electronic label antenna.

Background technology

In recent years, automatic identifying method is in many service fields, aspect sale of goods and the logistics distribution, in commercial department, obtained popularizing fast and promoting in manufacturing enterprise and the material field of circulation.

Several years ago, bar code---paper tape has caused a revolution and has obtained extensive use in the recognition system field.Today, this bar code---paper tape can not satisfy people's demand under increasing situation.Though bar code is very cheap, its weak point is that storage capacity is little and can not rewrite.

A kind of technical best solution be with storage in a silicon.In daily life, having the IC-card of arranging the contact (phone IC-card, bank card etc.) is the most general structure of electric data carrier.Yet concerning IC-card, in many cases, the connection of mechanical contact is insecure.Data between the reader under data medium and one are carried out non-contact transmission with much flexible.According to the energy and the data transmission method that use, we are called radio-frequency recognition system (RFID-Radio Frequency Identification) to non-contacting recognition system.Therefore, RFID is that a kind of radio wave that utilizes is read and write programmed recording medium, radio-frequency technique is combined with the IC-card technology and can be used for the technology of remote, moving-target, wireless identification.

Rfid system is in concrete application process, and according to different application purposes and applied environment, the composition of system can be different, but with regard to its operation principle, system generally all is made up of transponder, reader and PC.Transponder should be placed on the object that will discern, can send and receive information, and can do processing such as read/write according to the operational order of receiving; Reader is to gather transponder information and transponder is sent the device of operational order, and the order of sending comprises read/write, selects order such as cancellation selections grade.

Antenna is a critical component in radio communication and the radar system as the equipment of a kind of reception and launching electromagnetic wave, and it is the interface of free space and transmission line, is commonly referred to " electronic eyes " or " electronic ear ".The effect of antenna in various radiotechnics equipment is identical basically.Any radiotechnics equipment all transmits signal by electromagnetic wave, and it must have the energy radiation or receive electromagnetic device, and antenna is exactly this device, so the effect of antenna at first is exactly radiation and receives electromagnetic wave.Based on such prerequisite, since the generation of wireless communication technique, antenna just has been born thereupon.

From the simplest wire antenna, surface antenna, antenna technology has experienced innovation for several times.Along with the expansion in antenna applications field, being showing improvement or progress day by day of wireless communication technology, people are more and more higher to the requirement of antenna: operating distance is far away as much as possible, and it is big as much as possible to gain, and power consumption is as much as possible little, and efficient is high as much as possible, and polarization is coupling or the like as much as possible.Invented technology such as microstrip antenna and antenna array in recent years again, made antenna be applied in more field, intelligence communication field particularly is such as the TD-SCDMA mobile phone.

Electronic tag prints on paper or the plastic film for the label that reduces cost often adopts, and label is attached to and means to have different resonance frequencys on the different objects like this.The environment of periphery is also bigger to the resonance frequency influence of electronic tag.Also having the frequency range of the electronic tag of UHF is 860MHz-960MHz, than the frequency band of broad, guarantee that country variant uses certain frequency band wherein, and label can use in any country.It is very necessary designing wide band electronic label antenna for this reason.

The most frequently used form of label antenna is half-wave dipole or short dipole, as shown in Figure 1.But its frequency band is not wide relatively.

Yagi antenna is called again guides antenna into, yagi antenna, and active dipole in its mountain and Duo Gen parasitic element are formed, as shown in Figure 2.Active whole word can be the half-wave simple oscialltor, also can be folded dipole.If the distance of the Ah between parasitic element and the active dipole is less than quarter-wave, parasitic element than active dipole in short-term, whole electromagnetic wave energy will strengthen in the parasitic element direction; When parasitic element is longer than active dipole, will weaken in the parasitic element direction.Have the former parasitic element of effect and be called director, the parasitic element with latter's effect is called reflector.High directivity makes Yagi antenna have bigger gain.The electromagenetic wave radiation direction of Yagi antenna be with antenna on same plane, and the aerial radiation of dipole and folded dipole is an omnidirectional, its antenna pattern is the ring as for the antenna diameter direction of hanging down.

Summary of the invention

The purpose of this utility model is to provide a kind of high performance Yagi spark gap electronic label antenna, makes the radiation direction of antenna controlled, improves antenna gain.

A kind of high performance Yagi spark gap electronic label antenna is characterized in that, independently is made of the unit two of active dipole and parasitic elements, and wherein active dipole is a dipole.

Described dipole is made of broken line.

Described broken line opening portion is closed.

Described parasitic element is the straight line pressed close to or the deformation of straight line.

The length of described active dipole and parasitic element is identical.

The design constitutes simple Yagi antenna in conjunction with the half-wave dipole of broken line and director or guider.Wherein parasitic element is one or two very near parasitic elements of distance.By regulating the distance between active and the parasitic element and the width and the spacing of active dipole broken line, realize the impedance matching between antenna and the label chip.And the antenna pattern of antenna by adjust distance between parasitic element and the active dipole realize the irradiation of electromagnetic waves direction be active dipole to parasitic element direction or rightabout, perhaps both direction radiation.The lateral length of parasitic element of the present utility model and active dipole is identical.

The utility model passes through the Yagi antenna structure applications to make electronic label antenna inherit the characteristics of Yagi antenna highly directive high-gain to electronic label antenna, has improved the performance of electronic tag.

Description of drawings

Fig. 1 a is conventional half-wave dipole antenna schematic diagram;

Fig. 1 b is the antenna structure view that the dipole antenna two ends load with horizontal line;

Fig. 1 c is the antenna structure view that the dipole antenna two ends load with broken line;

Fig. 1 d is the terminal antenna structure view that loads with the rectangle conductor of dipole antenna;

Fig. 2 is conventional Yagi antenna schematic diagram;

Fig. 3 is the Yagi antenna schematic diagram that is used for Unit two of electronic tag;

Fig. 4 a is two unit Yagi antenna schematic diagrames of a kind of parasitic element T type deformation;

Fig. 4 b is that a kind of parasitic element is two unit Yagi antenna schematic diagrames of the deformation of straight line;

Fig. 4 c is that a kind of parasitic element is two unit Yagi antenna schematic diagrames of pressing close to straight line.

Number in the figure: the 30th, the routed electric point of active dipole; The 31st, the part of two arm broken line opening part closures of active dipole; The 32nd, two arms of the active dipole that broken line constitutes; The 33rd, parasitic element.

Embodiment

Further specifically describe the utility model antenna below in conjunction with the accompanying drawing example.

Fig. 3 is the Yagi antenna schematic diagram that is used for Unit two of electronic tag.The design's active dipole is to be made of broken line 32, and basic configuration is the battlement form, and wherein the opening closure 31 of part battlement is used for adjusting the impedance of antenna.Electricity point 30 both sides present symmetrical structure bursting.Passive a period of time 33 is a wide relatively straight line, and is parallel with active a period of time, equal in length.

Fig. 4 is two unit Yagi antenna schematic diagrames of several deformation.Passive a period of time of Fig. 4 a, both were along the routed electricity point of antenna axial symmetry by a straight line and the wide short lines be combined into that length is the same with active a period of time.The broken line width overstriking of the end of the battlement dipole antenna of Fig. 4 b is used for regulating the impedance of antenna; Wide passive a period of time back of the body of Fig. 4 c is divided into two parallel lines of close proximity, and both length all equals the length in active a period of time; And the spacing of the battlement in active a period of time of this figure neither equate, is used for adjusting the impedance of antenna and the impedance matching of chip.

It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Claims

1. a high performance Yagi spark gap electronic label antenna is characterized in that, independently is made of the unit two of active dipole and parasitic elements, and wherein active dipole is a dipole.

2. high performance Yagi spark gap electronic label antenna according to claim 1 is characterized in that: described dipole is a half-wave dipole.

3. high performance Yagi spark gap electronic label antenna according to claim 1, it is characterized in that: described dipole is made of broken line.

4. high performance Yagi spark gap electronic label antenna according to claim 2 is characterized in that: described broken line opening portion is closed.

5. high performance Yagi spark gap electronic label antenna according to claim 1 is characterized in that: described parasitic element is the straight line pressed close to or the deformation of straight line.

6. high performance Yagi spark gap electronic label antenna according to claim 1 is characterized in that: the length of described active dipole and parasitic element is identical.