CN202042595U

CN202042595U - Ultrahigh-frequency radio frequency identification electronic tag antenna capable of working on metal surface

Info

Publication number: CN202042595U
Application number: CN2011201176830U
Authority: CN
Inventors: 付宇卓; 宋向明
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-04-20
Filing date: 2011-04-20
Publication date: 2011-11-16
Anticipated expiration: 2021-04-20

Abstract

The utility model discloses an ultrahigh-frequency radio frequency identification electronic tag antenna capable of working on a metal surface, comprising a patch antenna plate, a medium plate and a grounding plate which are sequentially arrayed from top to bottom. A first T-shaped groove, a second T-shaped groove, a first groove and a second groove are disposed on the patch antenna plate, the first T-shaped groove and the second T-shaped groove are symmetrically arranged along a center line of a plate surface, the first groove and the second groove are parallel to the center line of the plate surface and are symmetrically arranged along the center line of the plate surface, a micro-strip feeder and a grounding connecting portion are disposed between the first groove and the second groove, the grounding connecting portion is used for connecting an RFID (radio frequency identification) tag chip with the grounding plate, and an input port connected with the RFID tag chip is arranged between the micro-strip feeder and the grounding connecting portion. The ultrahigh-frequency radio frequency identification electronic tag antenna capable of working on the metal surface has the advantages of simple and compact structure, low cost, convenience in processing, higher antenna radiation efficiency and gain, easiness in impedance matching and the like.

Description

Can work in the super high frequency radio frequency identification electronic label antenna of metal surface

Technical field

The utility model is mainly concerned with radio-frequency (RF) identification (RFID) system field, refers in particular to a kind of electronic tag directional antenna.

Background technology

Radio-frequency (RF) identification (RFID) is a kind ofly to carry out non-contacting data communication by wireless radio frequency mode, target is discerned and obtained the automatic identification technology of relevant information.In industries such as logistics and storage, help the informationization of Item Information, the collection and the management of high speed, realize high efficiency management and scheduling article.Along with the research and development of product electronic code (EPC) and Internet of Things, the design of hyperfrequency (UHF) electronic tag more and more is subjected to people's attention.Radio-frequency (RF) identification (RFID) system is made of electronic tag and read write line, its course of work is, read write line produces the electromagnetic wave of characteristic frequency and sends (send and put question to signal) by spatial coupling, when read write line enter electronic tag read apart from the time electronic tag return to read write line (answer answer signal) after receiving this enquirements signal and the electromagnetic wave of read write line transmission being carried out the backscattering coupling.In rfid system, electronic label antenna is born the effect of received energy, and whole rfid system is played crucial effects.

But UHF RFID label antenna runs into two big difficult points in design with in using.The first, the RFID label can be glued to the various article surfaces of different dielectric properties in actual use.The different dielectric properties of various article can produce deterioration in various degree to the performance of RFID label antenna.Especially metal surface, even may cause the RFID label to be identified, influence the work of rfid system.The second, because the complexity of environment causes the distance that reads of electronic tag to reduce.In order to increase the effective reading distance of electronic tag, be necessary to improve the gain of label antenna so that satisfy the requirement of reading distance.

In the design of RFID label antenna, except will considering and overcome above-mentioned two difficult points, need also to make that the RFID label antenna possesses that input impedance is easy to adjust, volume is less, handling ease and characteristics with low cost.Such label antenna could be accepted by market, could bring convenience for the universal use of RFID technology.

The utility model content

The technical problems to be solved in the utility model just is: at the technical problem that prior art exists, the utility model provides the super high frequency radio frequency identification electronic label antenna of a kind of simple and compact for structure, with low cost, easy to process, the antenna radiation efficiency and higher, as to be easy to impedance matching the worked in metal surface of gaining.

For solving the problems of the technologies described above, the utility model by the following technical solutions:

A kind of super high frequency radio frequency identification electronic label antenna that works in the metal surface, it is characterized in that: comprise the paster antenna plate that is arranged in order from top to bottom, dielectric-slab and ground plate, offer first T-slot and second T-slot that are symmetric arrangement along plate face center line on the described paster antenna plate, parallel with plate face center line and be first groove and second groove of symmetric arrangement along plate face center line, be provided with the input port that links to each other with the RFID label chip between the ground connection coupling part that is provided with microstrip-fed line and is used for being connected RFID label chip and ground plate between described first groove and second groove, described microstrip-fed line and ground connection coupling part.

As further improvement of the utility model:

Described paster antenna plate is a rectangle.

The length of described paster antenna plate is that 76mm～86mm, width are 36mm～44mm.

The thickness of described dielectric-slab is that 2mm～4mm, length are that 96mm, width are 50mm.

Compared with prior art, advantage of the present utility model is:

1, the utility model can work in the super high frequency radio frequency identification electronic label antenna of metal surface, simple and compact for structure, with low cost, processing easy, antenna radiation efficiency and gain higher, adopt microstrip-fed mode, be easy to impedance matching, and then help lend some impetus to the informationization of logistics, improve the efficient of product in logistics, and reduce logistics cost and administration overhead;

2, the utility model can work in the super high frequency radio frequency identification electronic label antenna of metal surface, needs ground plate when work, just considers the grounding characteristics of antenna in design, and antenna can be applied to the metal surface easily.Antenna work and metal surface, the launching effect of metal strengthens the gain of antenna on the contrary, makes tag read distance bigger.Antenna adopts microstrip-fed mode, and its input is a microstrip line, and impedance is easy to UHF RFID chip mates, and can mate different RF ID chip easily, is applied to different rfid systems.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is a side-looking structural representation of the present utility model;

Fig. 3 is the return loss schematic diagram that the utility model carries out emulation.

Marginal data:

1, paster antenna plate; 2, first T-slot; 3, second T-slot; 4, microstrip-fed line; 5, input port; 6, first groove; 7, second groove; 8, ground connection coupling part; 9, dielectric-slab; 10, plate face center line; 11, ground plate.

Embodiment

Below with reference to Figure of description and specific embodiment the utility model is described in further details.

As depicted in figs. 1 and 2, the utility model can work in the super high frequency radio frequency identification electronic label antenna of metal surface, comprise the paster antenna plate 1 that is arranged in order from top to bottom, dielectric-slab 9 and ground plate 11, offer first T-slot 2 and second T-slot 3 that are symmetric arrangement along plate face center line 10 on the paster antenna plate 1, parallel with plate face center line 10 and be first groove 6 and second groove 7 of symmetric arrangement along plate face center line 10, the ground connection coupling part 8 that is provided with microstrip-fed line 4 and is used for being connected RFID label chip and ground plate 11 between first groove 6 and second groove 7, be provided with the input port 5 that links to each other with the RFID label chip between microstrip-fed line 4 and the ground connection coupling part 8, directly link to each other with the RFID label chip.In the present embodiment, paster antenna plate 1 is a rectangle.Dielectric-slab 9 adopts the FR4 dielectric-slab, and the copper sheet ground plate is posted in dielectric-slab 9 bottom surfaces.Wherein, microstrip-fed line 4 width and adjustable length, width is at 2mm～4mm, and length is at 6mm～10mm.

The input impedance scalable of the utility model in working frequency range, the degree of depth by regulating first groove 6 and second groove 7 and the width of ground connection coupling part 8, the impedance phase coupling of the RFID label chip that can use with reality.Concrete, increase the degree of depth of groove and the width of minimizing ground connection coupling part 8 and can increase input impedance.Input impedance also can be regulated in the position of the bossing by suitable adjusting first T-slot 2 and second T-slot 3, reaches the purpose of impedance matching.

The selection of the material of dielectric-slab 9, mainly according to its dielectric constant, the three dB bandwidth that the thickness of adjusting dielectric-slab 9 can be regulated antenna.This antenna is operated in 915MHz, and its operating frequency is by the decision of the size of the thickness of the length of paster antenna plate 1, width and dielectric-slab 9 and dielectric constant.According to application background of the present utility model, the length range of choice of paster antenna plate 1 is 76mm～86mm here, and width is 36mm～44mm, and the thickness of dielectric-slab 9 is chosen as 2mm～4mm, and length and width are respectively 96mm and 50mm.The material of dielectric-slab 9 is FR4 commonly used, and its dielectric constant is 4.4.By the emulation to the micro-strip paster antenna of the utility model, artificial echo loss result as shown in Figure 3.The frequency band range of-3dB is 902MHz-932MHz, and frequency bandwidth is about 30MHz, and maximum return loss is close to-17dB, has good performance, can be used in the super high frequency radio frequency identification application.

Below only be preferred implementation of the present utility model, protection range of the present utility model also not only is confined to the foregoing description, and all technical schemes that belongs under the utility model thinking all belong to protection range of the present utility model.Should be pointed out that for those skilled in the art the some improvements and modifications not breaking away under the utility model principle prerequisite should be considered as protection range of the present utility model.

Claims

1. the super high frequency radio frequency that can work in the metal surface is discerned electronic label antenna, it is characterized in that: comprise the paster antenna plate (1) that is arranged in order from top to bottom, dielectric-slab (9) and ground plate, offer first T-slot (2) and second T-slot (3) that are symmetric arrangement along plate face center line (10) on the described paster antenna plate (1), parallel with plate face center line (10) and be first groove (6) and second groove (7) of symmetric arrangement along plate face center line (10), be provided with the input port (5) that links to each other with the RFID label chip between the ground connection coupling part (8) that is provided with microstrip-fed line (4) and is used for being connected RFID label chip and ground plate between described first groove (6) and second groove (7), described microstrip-fed line (4) and ground connection coupling part (8).

2. the super high frequency radio frequency identification electronic label antenna that works in the metal surface according to claim 1, it is characterized in that: described paster antenna plate (1) is a rectangle.

3. the super high frequency radio frequency identification electronic label antenna that works in the metal surface according to claim 2, it is characterized in that: the length of described paster antenna plate (1) is that 76mm～86mm, width are 36mm～44mm.

4. according to claim 1 or the 2 or 3 described super high frequency radio frequency identification electronic label antennas that work in the metal surface, it is characterized in that: the thickness of described dielectric-slab (9) is that 2mm～4mm, length are that 96mm, width are 50mm.