KR101669429B1

KR101669429B1 - HF UHF multi-band RFID tag antenna

Info

Publication number: KR101669429B1
Application number: KR1020150189966A
Authority: KR
Inventors: 정유정
Original assignee: 대구대학교 산학협력단; 박스뱅크주식회사
Priority date: 2015-12-30
Filing date: 2015-12-30
Publication date: 2016-10-26

Abstract

The present invention relates to an HFU multi-band RF ID tag antenna comprising a left antenna pole (11), a left unterminated line (12) connected to the left antenna pole (11), a left unterminated line An antenna loop 13 connected to the antenna loop 13, a right unterminated line 14 connected to the antenna loop 13, a right antenna pole 15 connected to the right unterminated line 14, (10) comprising a tag antenna (16); A plurality of planar coil antennas 21 in the form of rectangular bands 21a and jumper 22 formed at the ends of the plane coil antenna 21 and H- (13.56 MHz) band and UHF (920 MHz) band can be used at the same time, and it is possible to use the HF band and the UHF Band in the UHF band while operating in the HF band, it not only provides 6 ~ 7m long tag for recognition in the UHF band, but also simplifies the structure and reduces the manufacturing cost, It is a useful invention with a particular advantage that it can be used stably.

Description

[0001] HF UHF multi-band RFID tag antenna [0002]

Field of the Invention [0002] The present invention relates to a film-printed RF ID tag antenna, and more particularly, to an HF multi-band RF ID tag antenna capable of simultaneously using the HF (13.56 MHz) band and the UHF (920 MHz) band.

When a signal of about 1 W is transmitted from the reader / writer using a radio signal of UHF band (860 to 960 MHz) and a response signal is sent back to the reader / writer side when the signal is received from the tag (tag) side, Is read by a reader / writer is known as an RFID (Radio Frequency Identification) system.

The communication distance varies depending on the gain of the tag-side antenna, the operating voltage of the IC (integrated circuit) chip in the tag, and the surrounding environment, but is about 3 m.

An RFID tag is generally composed of an antenna having a thickness of about 10 to 30 μm and an IC chip connected to an antenna feed point. This IC chip is generally equivalently represented by a parallel connection of a resistance Rc (for example, 1200?) And a capacitance Cc (for example, 0.58 pF), and the antenna has a resistance Ra (e.g., 1000?), (La) (for example, 48 nH). When these elements are connected in parallel, the equivalent circuit is as shown in Fig.

Here, the resonance frequency (f ₀ ) expressed by the following formula (1) where the capacitance Cc and the inductance La resonate is matched. Therefore, when the resonance frequency signal is received by the antenna, Power is sufficiently supplied to the IC chip.

[Equation 1]

As a basic antenna used for a tag antenna, for example, a folded dipole antenna having a total length of about 150 mm and a width of about 15 mm as shown in Fig. 2 is used. The gain of this antenna is about 2dBi. This total length is half of the wavelength of f = 953 MHz (about 300 mm) and resonates at that frequency by having a current distribution of? / 2. In this resonance frequency, the imaginary component (inductance and capacitance component) of the admittance of the folded dipole antenna is 0. Therefore, as in Fig. 2, by connecting the inductance portion La in parallel to the folded dipole antenna, .

Thus, when the RFID tag is attached to a metallic object, the conventional tag antenna operates only in one band of the HF band or the UHF band. When the antenna is adhered to the metal surface, unnecessary high- A phenomenon that the resonance frequency is shifted or the antenna gain is lowered may occur and communication with the reader / writer may become impossible.

In addition, the conventional tag antenna has a problem that it is difficult to form tag anchors of various shapes and sizes because the conductive ink for printing is low in conductivity and expensive and uses an etching type without using a printing type.

The present invention has been made to solve the various drawbacks and problems caused by the conventional tag antenna, and it is an object of the present invention to provide a tag antenna which can simultaneously use HF (13.56 MHz) band and UHF (920 MHz) Tag antenna.

Another object of the present invention is to provide an ink jet printer which can easily realize various shapes and sizes of a film printing type ink with low cost and good conductivity and can use a dual band of HF (13.56 MHz) band and UHF (920 MHz) And to provide a multi-band RF ID tag antenna.

It is still another object of the present invention to provide an HF multi-band RF ID tag antenna that operates in the HF band and provides a tag for long distance 6 to 7 m recognition in the UHF band.

It is another object of the present invention to provide an HF multi-band RF ID tag antenna which is simple in structure and which can reduce the cost of manufacturing a product, and which can be used economically and stably without a long-term failure.

In order to accomplish the above object, the present invention provides a multi-band RF ID tag antenna comprising a left antenna pole 11, a left end end line 12 connected to the left antenna pole 11, An antenna loop 13 connected to the line 12, a right unterminated line 14 connected to the antenna loop 13, a right antenna pole 15 connected to the right unterminated line 14, A Yu-tag tag antenna 10 made up of a Yu-chip chip 16; A plurality of planar coil antennas 21 in the form of rectangular bands 21a and jumper 22 formed at the ends of the plane coil antenna 21 and H- And an HF tag antenna 20 comprising an FPC 23.

The present invention can easily realize various shapes and sizes of a film printing type ink using an HF (13.56 MHz) band and a UHF (920 MHz) band at the same time, In addition to providing tag for long distance 6 ~ 7m recognition, it has a simple structure and it has a special advantage that it can be used economically, and can be used stably for a long time without any trouble.

1 is a view showing an equivalent circuit when an IC chip is connected to a feed point of an RFID antenna,
2 is a view showing an example of a folded dipole antenna in which an inductance section is connected in parallel,
3 is a view showing a first embodiment of an HFU multi-band RF ID tag antenna according to the present invention,
4 is a view showing a second embodiment of the inventive HF multi-band RF ID tag antenna according to the present invention,
5 is a view showing a third embodiment of the inventive HF multi-band RF ID tag antenna according to the present invention,
6 is a view showing an embodiment in which an end portion of an antenna pole is deformed into a patch shape,
FIG. 7 is a graph showing the reflection coefficient of the tag that is changed by the frequency change,
FIG. 8 is a graph showing the reflection coefficient of a tag that is changed by a frequency change,
9 is a graph showing a radiation pattern of a tag at a center frequency,
10 is a graph showing the recognition distance of the tag
11 is a view showing another embodiment of an HFUF multi-band RF ID tag antenna of the present invention.
12 is a view showing reflection coefficients of the tag antenna of FIG. 11;
Fig. 13 is a view showing a different embodiment of the ELF tag antenna portion of Fig. 11; Fig.
FIG. 14 is a view showing a first embodiment of the UWB RFID antenna portion of FIG. 11 and reflection coefficient thereof; FIG.
Fig. 15 is a view showing a second embodiment of the UHF tag antenna portion of Fig. 11 and reflection coefficient thereof; Fig.
FIG. 16 is a view showing a third embodiment of the UWB RFID antenna portion of FIG. 11 and reflection coefficient thereof; FIG.
FIG. 17 is a view showing a fourth embodiment of the UWB RFID antenna portion of FIG. 11 and reflection coefficients thereof; FIG.
FIG. 18 is a view showing a fifth embodiment of the UWB RFID antenna portion of FIG. 11 and reflection coefficient thereof; FIG.
Fig. 19 is a diagram showing a recognition distance of each tag antenna of Fig. 11 according to angles; Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the inventive HF multi-band RF ID tag antenna will be described in detail with reference to the accompanying drawings.

FIG. 3 is a view showing a first embodiment of an HF multi-band RF ID tag antenna according to the present invention. FIG. 4 is a view showing a second embodiment of an HF multi-band RF ID tag antenna according to the present invention. 6 is a view showing an embodiment in which an end portion of an antenna pole is modified into a patch shape, and Fig. 7 is a view showing an example of a reflection coefficient of a tag crossed with a frequency change 9 is a graph showing a radiation pattern of a tag at a center frequency, and FIG. 10 is a graph showing a recognition distance of a tag. In the graph of FIG. 8, The multi-band RF ID tag antenna is connected to the left antenna pole 11 and the left antenna pole 11 End line 12 connected to the antenna loop 13 and connected to the left unterminated line 12 and a right unterminated line 14 connected to the antenna loop 13, A right antenna pole 15 connected to the line 14, and a USB tag antenna 10 made up of a Yuft chip 16; A plurality of planar coil antennas 21 having a square band 21a and a jumper 22 formed at an end of the plane coil antenna 21 and a plurality of band- And an HF tag antenna 20 composed of an HF chip 23.

The first embodiment of the present invention is characterized in that each of the rectangular bands 21a of the plane coil antenna 21 constituting the HF tag antenna 20 has a square shape, Each of the rectangular bands 21a of the plane coil antenna 21 constituting the antenna 20 has a rectangular shape.

In the third embodiment of the present invention, each of the square bands 21a of the plane coil antenna 21 constituting the HF tag antenna 20 forms a trapezoidal shape.

The UL tag antenna 10 and the ELF tag antenna 20 are electrically conductive film printing type and are formed on the same plane separately from each other.

The left antenna pole 11 may form a patch 11a with a length of 22.0 to 25.0 mm at an end and the right antenna pole 15 may form a patch 15a with a length of 6 to 11 mm at an end thereof .

Next, the inventive HIFU multi-band RF ID tag antenna of the present invention having the above configuration was actually fabricated, and the recognition performance of the tag antenna was analyzed by simulating the reflection coefficient and the radiation pattern at the center frequency of 920 MHz.

Example 1

The length of the left end end line 12, the antenna loop 13 and the right end end line 14 is 76 mm, the width of the left and right end end lines 12 and 14 is 2.0 mm End lines 12 and 14 are 0.4 mm and the space between the lines of the left and right end lines 12 and 14 is 0.4 mm and the length of the left antenna pawl 11 is d1, The length of the right antenna pole 15 is d2, and the length of the whole antenna pillar 15, that is, the length of d1 + d2 is different. Thus, an MFIF multi-band RF ID tag antenna is manufactured.

At this time, a tag antenna having d1 = 44 mm and d2 = 16.4 mm, that is, d1 + d2 = 60.4 mm is assumed to be a UHF tag 1, and tag antennas having d1 = 45 mm and d2 = 16.4 mm, The UHF tag 3 is a tag antenna having d1 = 45 mm and d2 = 0, that is, d1 + d2 = 45 mm. The reflection coefficient at each frequency is obtained as shown in Table 1 below, Respectively.

Tag type Pole length of tag antenna
(d1 + d2) mm Reflection Coefficient @ 920MHz UHF tag 1 60.4 mm -4.95mm UHF tag 2 61.4 mm -4.73mm UHF tag 3 45.0 mm -

From Table 1 and FIG. 6, it can be seen that the reflection coefficient of UHF tag 2 is better than that of UHF tag 1 at 900 MHz, but the reflection coefficients of UHF tag 1 and UHF tag 2 are similar at 920 MHz.

Example 2

A = 34.6 mm, b = 59.2 mm and b '= 67.6 mm in the manufacture of the ELF tag antenna 20 by employing the third embodiment of the present invention and the line width of the ELF tag antenna 20 is 0.3 mm , A tag antenna with a gap of 0.3 mm between the lines and the spaces between the lines and a number of gaps of 7 was fabricated and called hfv 20.

A '= 38.0 mm, b = 42.0 mm and b' = 42.0 mm in the manufacture of the ELF tag antenna 20 by employing the second embodiment of the present invention, 20), the gap between the lines and the space between the lines was 0.4 mm, and a tag antenna with a number of gaps of 9 was fabricated and called hfv 21.

A '= 40.0 mm, b = 42.0 mm and b' = 42.0 mm in the manufacture of the ELF tag antenna 20 by employing the second embodiment of the present invention, 20) was 0.4 mm, the spacing between the lines and the space between the lines was 0.4 mm, and the tag antenna with 9 gaps was fabricated to be hfv 22.

A '= 34.6 mm, b = 59.2 mm and b' = 59.2 mm in the manufacture of the ELF tag antenna 20 by employing the second embodiment of the present invention, 20), the spacing between the lines and the spaces between the lines was 0.3 mm, and a tag antenna with 7 gaps was fabricated and called hfv 23.

A '= 34.0 mm, b = 55.0 mm and b' = 55.0 mm in the manufacture of the ELF tag antenna 20 by employing the second embodiment of the present invention, 20), 0.3 mm spacing between the lines and the space between the lines, and a tag antenna with 8 gaps (8 h).

Table 2 shows the HF tag antenna 20 manufactured in the second embodiment.

name chip Expected frequency Line width Line spacing Yoon Eun size hfv20

MF0 ICU10 00

13.46 MHz 0.3mm 0.3mm 7 67.6 x 34.6 mm ² hfv21 13.74 MHz 0.4mm 0.4mm 9 42.0 x 38.0 mm < ² > hfv22 13.48 MHz 0.4mm 0.4mm 9 42.0 x 40.0 mm < ² > hfv23 14.18 MHz 0.3mm 0.3mm 7 59.2 x 34.6 mm ² hfv24 13.20 MHz 0.3mm 0.3mm 8 55.0 x 34.0 mm < ² >

Example 3

The length of the left end end line 12, the antenna loop 13 and the right end end line 14 is 76 mm, the width of the left and right end end lines 12 and 14 is 2.0 mm The left and right unterminated lines 12 and 14 have a line width of 0.4 mm and the space between the lines of the left and right unterminated lines 12 and 14 is 0.4 mm and the length d1 of the left antenna pawl 11 is 45 mm, The RFID tag antenna 10 having the length d2 of the antenna pole 15 of 16.4 mm and the length c of the antenna loop 13 of 20 mm and the width f of 2.15 mm was fabricated as uhfv 20.

The same RFID tag antenna 10 as the above uhfv 20 was fabricated with the antenna loop 13 having a length c = 28.4 mm and a width f = 2.15 mm in the UL tag antenna 10 and called uhfv 21.

The length d1 of the left antenna pole 11 is 33.4 mm and the length d2 of the right antenna pole 15 is 14.8 mm and the distance from the end of the left antenna pole 11 to 22.6 mm and the distance A patch was formed from the end of the antenna pole 15 to 6.4 mm, and a UHFv antenna 10 identical to the uhfv 21 was fabricated to be uhfv 22.

The same RFID tag antenna 10 as that of the uhfv 21 was manufactured and called uhfv 23 except that the length d2 of the right antenna pole 15 in the UL tag antenna 10 was 18.4 mm.

The length d1 of the left antenna pole 11 is 37.8 mm and the length d2 of the right antenna pole 15 is 20.8 mm and the distance from the end of the left antenna pole 11 to 22.6 mm, A patch was formed from the end of the antenna pole 15 to 10.8 mm, and the other UHFv 22 antenna was fabricated to have the same UHFv tag antenna 10 as uhfv 24.

The length d1 of the left antenna pole 11 is 35.8 mm and the length d2 of the right antenna pole 15 is 26.0 mm and the distance from the end of the left antenna pole 11 to 25.0 mm, A patch was formed up to 10.8 mm from the end of the antenna pole 15, and the same RFID tag antenna 10 as that of the above uhfv 24 was fabricated as uhfv 25.

The reflection coefficient according to the frequency of the FM tag antenna 10 fabricated in the third embodiment is shown in Table 3 and shown in FIG. The radiation pattern is simulated at a center frequency of 920 MHz and is shown in Fig.

Tag type Reflection Coefficient @ 920 MHz Impedance @ 920 MHz uhfv 20 - 5.81 dB 5.21 + j148.32 uhfv 21 - 4.34 dB 4.32 + j134.15 uhfv 22 - 4.44 dB 4.18 + j134.58 uhfv 23 - 5.60 dB 5.19 + j135.82 uhfv 24 - 12.08 dB 15.10 + j148.33 uhfv 25 - 12.21 dB 16.71 + j136.15

From Table 3 and FIG. 7, it can be confirmed that the reflection coefficient of the uhfv 24, uhfv 25 tag is -10 dB or less and the chip impedance matches well.

Example 4

30 types of HF multi-band RF ID tag antennas were fabricated by combining the five kinds of H. F tag antennas 20 of the second embodiment and the six types of the FM tag antennas 10 of the third embodiment, The tag antenna (7, 11, 13) with excellent antenna function was measured at external (Daegu University) which is a general environment and the results are shown in Tables 4 and 5 Quot; is shown in Fig. 9).

No
                Dual band tag   EAGJAX recognition distance
   Remarks
     HF tag         UHF Dag
  HF band
UHF band Tag name Center frequency Tag name     Reflection coefficient 7

hfv21

13.74 MHz

uhfv20    -5.81 dB   6.78m 8 uhfv21    -4.34 dB 9 uhfv22    -4.44 dB 10 uhfv23    -5.60 dB 11 uhfv24    -12.08 dB   6.71m 12 uhfv25    -12.21 dB 13

hfv22

13.48 MHz

uhfv20    -5.81 dB   7.23m 14 uhfv21    -4.34 dB 15 uhfv22    -4.44 dB 16 uhfv23    -5.60 dB 17 uhfv24    -12.08 dB 18 uhfv25    -12.21 dB

As shown in Table 4 and Table 5 and Fig. 9, the recognition distance was the best at 7m for uhf20hfv21 (No. 13), 6.5m for uhf20hfv21 (No. 7) and uhf24hfv21 (No. 11) Small values.

As can be seen from Embodiments 1 to 4, it can be seen that the HIFU multi-band RF ID tag antenna according to the present invention can be used as a tag which can operate in the HF band and can be recognized in the UHF band at a distance of 6 to 7 m .

Uhf20hfv21 (# 7) Uhf24hfv21 (# 11) Uhf20hfv22 (13) Primary 95s1 (example) Angle Distance (cm) Distance (cm) Distance (cm) Distance (cm) 0 650 650 560 635 20 575 610 515 600 40 490 370 520 425 60 440 355 420 410 80 405 355 390 420 100 415 390 470 420 120 495 430 470 215 140 465 470 470 445 160 510 530 610 415 180 510 530 700 430 200 530 530 570 415 220 525 505 470 400 240 360 330 435 405 260 300 330 280 390 280 325 270 230 370 300 625 370 320 375 320 530 440 495 430 340 580 430 470 370 360 650 650 560 365

FIG. 11 is a view showing another embodiment of the HF multi-band RF ID tag antenna of the present invention, and FIG. 12 is a diagram showing the reflection coefficient of the tag antenna of FIG.

Referring to FIGS. 11 and 12, the magnitude of the reflection coefficient is about -30 dB at about 920 MHz.

The total size of the UHF tag antenna and the HF tag antenna is about 7.5 x 7 cm, the tag of the HF band is 40x30 mm, the thickness of the conductor is 0.4 mm, the distance from the conductor is 0.4 mm, and the number of turns is 7. 11, the distance between the right and left end lines 14 and 20 of the RFID tag antenna 10 is 37 mm and the distance between the left and right end lines 12 and 14 End widths of the left and right end lines 12 and 14 are 0.4 mm and the space between the lines of the left and right end lines 12 and 14 is 1.2 mm.

HF tag antenna design is designed to resonate at 13.56MHz.

Since the chip used is NTag213 and the total capacitance of the chip is 50 pF, the chip impedance value is 234.74 ohms calculated by 1 / 2pi * f * C at 13.56 MHz. The tag antenna should be designed to perform conjugate matching. To achieve this, the inductor value of the tag antenna should be 2.76uH by 237.7 = 2 * pi * f * L.

The design of the HF tag was performed by adjusting the resonance frequency by setting the thickness of the conductive line to 0.4 mm and the spacing on the line to be 0.4 mm.

13 is a view showing different embodiments of the HF tag antenna portion of FIG.

Referring to FIG. 13 and Table 6, the results according to the number of turns of the line are shown. At this time, the number of wraps around the track shows the best recognition distance at 7 times.

Figs. 14 to 18 are views showing first to fifth embodiments of the UHF tag antenna portion of Fig. 11 and reflection coefficients thereof.

Referring to FIGS. 14 to 18 and Table 7, tags having different shapes according to the shapes of the respective tag antennas and having the shape of the group 3 of FIG. 16 have the best recognition distance results.

FIG. 19 is a diagram showing the recognition distance of the UHF tag antenna of FIG. 11 by angle.

Referring to FIG. 19, the best recognition distance of the best UHF tag is about 6 meters in the frontal measurement.

While the present invention has been described with reference to the preferred embodiments, it is to be understood that the invention is not limited thereto and that various changes and modifications may be made therein without departing from the scope of the invention.

10: Yu-Gi-Oh Tag antenna 11: Left antenna pole
11a: Patch 12: Left unterminated line
13: antenna loop 14: right unterminated line
15: Right antenna pole 15a: Patch
16: Yuhei chip chip 20: HF tag antenna
21: plane coil antenna 21a: rectangular band
21a ': a band of the square of the innermost corner 22: a jumper
23: HF chip

Claims

A left antenna end 11 connected to the left antenna pole 11; an antenna loop 13 connected to the left end end line 12; A left unaffected line 15 connected to the right unaffected line 15 and a right unaffected line 14 connected to the right unaffected line 14 and a right unaffected line 15 connected to the right unaffected line 14 and a USHF chip 16; A plurality of planar coil antennas 21 having a square band 21a and a jumper 22 formed at an end of the plane coil antenna 21 and a plurality of band- A Huffman ULV multi-band RF ID tag antenna comprising an HF tag antenna (20) comprising an HF chip (23);
Each of the square bands 21a of the planar coil antenna 21 constituting the HF tag antenna 20 has a square shape;
The UL tag antenna 10 and the ELF tag antenna 20 are electrically conductive film printed type and are formed on the same plane separately from each other;
A patch 11a is formed at a length of 22.0 to 25.0 mm at the end of the left antenna pole 11 and a patch 15a is formed at a length of 6 to 11 mm at the end of the right antenna pole 15,
The total size of the UL tag antenna 10 and the ELF tag antenna 20 is 7.5 cm x 7 cm and the size of the ELF tag antenna 20 is 4 cm x 3 cm and the thickness of the conductor is 0.4 mm , The interval from each conductor is 0.4 mm, the number of turns is 7,
The left and right end lines 12 and 14 have a distance of 2.0 mm and the left and right end ends 14 and 37 of the RFID tag antenna 10 are 37 mm apart. The line width of the lines 12 and 14 is 0.4 mm and the space between the lines of the left and right unused end lines 12 and 14 is 1.2 mm.

The RF ID tag antenna according to claim 1, wherein each of the rectangular bands (21a) of the plane coil antenna (21) constituting the HF tag antenna (20) is rectangular.

The RFID tag according to claim 1, wherein each of the rectangular bands (21a) of the plane coil antenna (21) constituting the HF tag antenna (20) has a trapezoidal shape.