CN201478454U

CN201478454U - Dipole electronic label antenna

Info

Publication number: CN201478454U
Application number: CN2009201349391U
Authority: CN
Inventors: 李云华; 张国辉; 鄢黎
Original assignee: Invengo Information Technology Co Ltd
Current assignee: Invengo Information Technology Co Ltd
Priority date: 2009-08-19
Filing date: 2009-08-19
Publication date: 2010-05-19
Anticipated expiration: 2019-08-19

Abstract

The utility model discloses a dipole electronic label antenna, which solves the technical problems that the output impedance of the radio-frequency circuit of an electronic label is difficulty to be matched and the frequency bandwidth is difficulty to be broadened in UHF range. The dipole electronic label antenna comprises a printed board. A first pole and a second pole are respectively arranged on the two sides of the printed board. The first pole is arranged at one end of the reverse side of the printed board. The second pole is arranged at the other end of the front side of the printed board. The first pole and the second pole are partially overlaid in the middle space of the printed board. Additional coupling units are symmetrically arranged on the two sides of the second pole. Compared with the prior art, the utility model has the advantages that the impedance of the electronic label can be easily matched with the impedance of the antenna and the frequency bandwidth can be easily broadened through the coupling between the two poles and the additional coupling units, the antenna can be matched with different electronic label chip circuits through adjusting the distance and the coupling degree between the additional coupling units and the dipole, and the commonality is high.

Description

The dipole electronic label antenna

Technical field

The utility model relates to the antenna of a kind of electronic tag of radio-frequency (RF) identification, particularly a kind of electronic tag.

Background technology

Depending on the impedance of tag circuit part in hyperfrequency uhf band electronic label antenna impedance operator, is not common 50 ohm, and the coupling of antenna is acquired a certain degree of difficulty.The bandwidth of electronic label antenna has determined the adaptable operating frequency of label, is the deciding factor that the stability to electronic tag work plays an important role.The dipole electronic label antenna has the good characteristic that size is little, simple in structure, radiance is good, thereby has obtained using widely in the uhf band electronic tag.The printed dipole electronic label antenna is owing to directly be produced on electronic label antenna in the printed board, is convenient to integrated with the electronic tag circuit, also is convenient to processing in enormous quantities.Traditional dipole electronic label antenna has radiance and input impedance characteristic preferably, but the output impedance that impedance operator is difficult to adjust to tag circuit part radio-frequency front-end is complementary.Realize impedance matching in order to make electronic label antenna, prior art has two kinds of approach usually: the one, in transmission circuit, add matching network, the 2nd, the feed form and the position of adjustment electronic label antenna, however still exist the impedance matching and the band spread that are not easy to realize antenna and electronic tag circuit, and versatility is poor.

Summary of the invention

The purpose of this utility model provides a kind of dipole electronic label antenna, and the technical problem that solve is at uhf band, and the output impedance of electronic tag radio circuit is mated and band spread.

The utility model is by the following technical solutions: a kind of dipole electronic label antenna, has printed board, the two sides of described printed board is respectively equipped with first, and extremely son and second is extremely sub, described first an extremely sub end that is positioned at the printed board reverse side, the described second extremely sub other end that is positioned at the printed board front, described first extremely son and second extremely son is in the stack of the central space top of printed board, the described second extremely sub both sides are provided with additional coupling unit symmetrically.

Of the present utility model first extremely son be rectangle, described second extremely son be taper type, described additional coupling unit is the triangle coupling unit.

Triangle two right-angle sides of the present utility model are of a size of 60mm * 12mm, and additional coupling unit and the second extremely spacing of son is 3mm.

Dipole of the present utility model first extremely son and second utmost point subspace stack length be 8mm, 1.6mm apart up and down.

Of the present utility model first extremely son be rectangle, described second extremely son be rectangle, the second extremely sub-both sides symmetry is stretched out two T-shape branches, described additional coupling unit is the rectangle coupling unit, T-shape branch stretches in the additional coupling unit.

Additional coupling unit of the present utility model is of a size of 13.5mm * 83mm.

T-shape branch of the present utility model and additional coupling unit distance are 1mm.

Dipole of the present utility model first extremely son and second utmost point subspace stack length be 3mm, 1.6mm apart up and down.

Printed board of the present utility model is a pcb board, and overall dimensions is 163.5mm * 80mm, and electronic label antenna centre frequency input characteristic impedance is 23+j216 Ω, and operating frequency range is 902MHz～928MHz.

The utility model compared with prior art, employing first extremely son and second is extremely sub, a first extremely sub end that is positioned at the printed board reverse side, the second extremely sub other end that is positioned at the printed board front, by extremely coupling between the son and additional coupling unit, be easier to reach impedance matching and band spread with electronic tag and antenna, by adjusting the coupling that additional coupling unit and the distance of dipole and the degree of coupling between the two can reach antenna and different electronic label chip circuit, stronger versatility is arranged simultaneously.

Description of drawings

Fig. 1-the 1st, the front view of the utility model embodiment 1.

Fig. 1-2 is Fig. 1-1 vertical view.

Fig. 2-the 1st, the front view of the utility model embodiment 2.

Fig. 2-the 2nd, the vertical view of Fig. 2-1.

Embodiment

The utility model will be further described below in conjunction with drawings and Examples.Dipole electronic label antenna of the present utility model has printed board 1, be respectively equipped with copper first son 2 and second son 3 extremely extremely on the two sides of printed board 1, first son 2 end that be positioned at printed board 1 reverse side extremely, second son 3 other end that be positioned at printed board 1 front extremely, the first extremely extremely son 3 stack coupling spatially of son 2 and second.

Embodiment 1, shown in Fig. 1-1 and Fig. 1-2, first extremely son 2 be shaped as rectangle, second extremely son 3 be shaped as taper type, first son 2 and second plane parallel of son 3 extremely extremely, taper type small end 10 is spatially overlapping with rectangle, forms impedance matching.Second extremely son 3 both sides be provided with triangular shaped additional coupling unit 4 symmetrically, a leg-of-mutton right-angle side is parallel with one side of taper type, the small end of leg-of-mutton drift angle and taper type in the same way, leg-of-mutton another right-angle side is parallel with the taper type base, and additional coupling unit 4 plays part impedance matching effect when being used for widening frequency band.First extremely son 2 be provided with and be shaped as the microstrip line that three

straight lines

7,8,9 connect into broken line, in order to second extremely son 3 to be connected label continuous.Antenna feed point 5 is arranged on the end of straight line 9, links to each other with the circuit part of electronic tag.Each several part is of a size of: first extremely son 2 for 80mm * 49mm; Second extremely son 3 be polygon, cut off two triangles symmetrically by adjacent angular and constitute at rectangle, rectangular dimension is about 83mm * 49mm accordingly, triangle two right-angle sides are respectively 17.5mm * 4.5mm; Second extremely son 3 be 3mm with the spacing 6 of additional coupling unit 4, adding 4 liang of right-angle side length of coupling unit is 60mm and 12mm; The connection second extremely broken line of son 3 is 13.5mm for first section 7, and second section 8 is 22mm, and the 3rd section 9 is 12mm; The stack length and width degree of taper type small end 10 is 8mm, up and down at a distance of 1.6mm, i.e. and the thickness of printed board 1; Printed board 1 is a pcb board, uses FR4 to print sheet material, and overall dimensions is 163.5mm * 80mm, and dielectric constant is 4.6, and thickness is 1.6mm.Antenna impedance is 23+j216 Ω, and the length of adjusting dipole can make electronic label antenna reach good impedance match with chip circuit in 902MHz～928MHz frequency range.

Embodiment 2, shown in Fig. 2-1 and Fig. 2-2, the dipole that distributing on the two sides of printed board 1 first extremely the son 2 and second extremely the son 3, the first extremely the son 2 and second extremely sub 3 shapes be rectangle, second extremely sub 3 ends spatially overlap first extremely on the son 2, form impedance matching.Second extremely two long limits of son 3 be provided with the T-shape branch 21 of symmetry, the outside of T-shape branch 21 is symmetrically arranged additional coupling units 4 that are shaped as rectangle, this T-shape branch 21 stretches in the additional coupling unit 4, with the distance 6 of additional coupling unit 4 be 1mm, by coupling broadening bandwidth, play part impedance matching effect simultaneously between T-shape branch 21 and the additional coupling unit 4.First extremely son 2 be provided with and be shaped as the microstrip line that three

straight lines

7,8,9 connect into broken line, in order to second extremely son 3 to be connected label continuous, antenna feed point 5 is arranged on the end of straight line 9, antenna feed point 5 is connected with the circuit of electronic tag.Each several part is of a size of: first extremely son 2 for 80mm * 49mm, second extremely son 3 be polygon, cutting off two triangles symmetrically by the adjacent angular at rectangle constitutes, corresponding rectangular dimension is about 83mm * 49mm, triangle two right-angle sides are respectively 17.5mm * 4.5mm, additional coupling unit 4 is of a size of 83mm * 13.5mm, and the connection second extremely broken line of son 3 is 13.5mm for first section 7, and second section 8 is 22mm, the 3rd section 9 is 12mm, first extremely the length of son 2 and second extremely sub 3 space overlaps part be 3mm, up and down at a distance of 1.6mm, i.e. the thickness of printed board 1, FR4 is used in printed board 1, overall dimensions is 163.5mm * 80mm, and dielectric constant is 4.6, and thickness is 1.6mm.Antenna impedance is 23+j216 Ω, reaches the good impedance match with chip circuit in 902MHz～928MHz frequency range.

The utility model adopts the space coupling between of antenna the two poles of the earth to reach impedance matching, add coupling unit by extremely sub-bilateral symmetry ground introducing therein again, frequency band spreading, have the effect of impedance matching simultaneously concurrently, have advantage simple in structure, highly versatile, can reach coupling with different electronic label chip circuit.

Claims

1. dipole electronic label antenna, has printed board (1), it is characterized in that: the two sides of described printed board (1) is respectively equipped with first son (2) and second extremely sub (3) extremely, described first extremely son (2) be positioned at an end of printed board (1) reverse side, described second extremely son (3) be positioned at the positive other end of printed board (1), described first extremely son (2) and second extremely son (3) in the stack of the central space top of printed board (1), described second extremely the both sides of sub (3) be provided with additional coupling unit (4) symmetrically.

2. dipole electronic label antenna according to claim 1 is characterized in that: described first extremely son (2) be rectangle, described second extremely sub (3) are taper type, described additional coupling unit (4) is the triangle coupling unit.

3. dipole electronic label antenna according to claim 2 is characterized in that: described triangle two right-angle sides are of a size of 60mm * 12mm, and additional coupling unit (4) and the second extremely spacing of son (3) is 3mm.

4. dipole electronic label antenna according to claim 3 is characterized in that: described dipole first extremely son (2) and second extremely son (3) space stack length be 8mm, 1.6mm apart up and down.

5. dipole electronic label antenna according to claim 1, it is characterized in that: described first extremely son (2) for rectangle, described second extremely the son (3) be rectangle, second extremely sub (3) both sides symmetry is stretched out two T-shape branches, described additional coupling unit (4) is the rectangle coupling unit, and T-shape branch stretches in the additional coupling unit (4).

6. dipole electronic label antenna according to claim 5 is characterized in that: described additional coupling unit (4) is of a size of 13.5mm * 83mm.

7. dipole electronic label antenna according to claim 6 is characterized in that: described T-shape branch and additional coupling unit (4) distance are 1mm.

8. dipole electronic label antenna according to claim 7 is characterized in that: described dipole first extremely son (2) and second extremely son (3) space stack length be 3mm, 1.6mm apart up and down.

9. according to claim 4 or 8 described dipole electronic label antennas, it is characterized in that: described printed board (1) is pcb board, overall dimensions is 163.5mm * 80mm, and electronic label antenna centre frequency input characteristic impedance is 23+j216 Ω, and operating frequency range is 902MHz～928MHz.