CN204857931U - Coupling capacitor RFID tag with isolation slot - Google Patents

Abstract

The utility model discloses a coupling capacitance RFID label with an isolation groove in an inserting way, which comprises a first antenna and a second antenna, wherein the distance between the first antenna and the second antenna can be adjusted in a telescopic way; the reading distance is long and can reach 11-13m through testing; the antenna can be stretched, namely the length is adjustable, the antenna can be used for a set of package with basically constant width but variable length, and the antenna has great practical value, good performance of each antenna, small standing wave ratio, low return loss, high gain and omnidirectionality.

Description

Coupling capacitor RFID tag with isolation slot

technical field

The utility model relates to a coupling capacitor RFID tag provided with an isolation groove.

Background technique

At present, radio frequency identification is RFID (Radio Frequency Identification) technology, also known as electronic tags and radio frequency identification. communication technology. Commonly used passive RFIDs include low frequency (125k~134.2K), high frequency (13.56Mhz), and ultrahigh frequency (860-960MHz). As an important part of the RFID system, the RFID tag antenna's performance will greatly affect the efficiency and quality of the entire RFID system. The main factors affecting the performance of RFID antennas include antenna size, operating frequency band, impedance and gain. Commonly used RFID antennas often adopt the form of bent-line dipoles, which is convenient for reducing the size of the antenna and processing the antenna. This type of antenna pattern is perpendicular to the antenna surface, so it is attached to the vertical outer surface of the target object when used; when the length of the object changes, the antenna is required to change accordingly, and its gain also changes, so it is necessary to design An antenna that can be changed according to the length. In addition, its various antenna performances also need to meet the requirements.

Contents of the invention

The purpose of the utility model is to overcome the above-mentioned shortcomings, and provide a coupling capacitance RFID tag provided with an isolation groove.

In order to achieve the above object, the specific scheme of the present utility model is as follows: comprising a substrate, and a coupling capacitive RFID tag antenna provided with an isolation groove on the substrate, a dielectric plate is arranged on the second antenna, and a dielectric plate is arranged on the dielectric plate. There is a tag chip, and the tag chip is electrically connected to the antenna;

The tag antenna includes a first antenna and a second antenna, and the distance between the first antenna and the second antenna can be adjusted telescopically.

The first antenna includes a strip-shaped first body, one end of the first body is provided with a first booster rod, the free end of the first booster rod is provided with an arc-shaped first booster antenna, and two Coupling grooves, the openings of the two coupling grooves face the other end of the first body, the two coupling grooves are arranged in parallel in the first body, and the upper and lower sides of each coupling groove are provided with serrated grooves; The second antenna includes a second body, the first body is longer than the second body, one end of the second body is provided with a second gain rod, and the free end of the second gain rod is provided with an arc-shaped first The two-gain antenna also includes two coupling strips that are arranged at the other end of the second body to match the coupling slots, the two coupling strips are arranged in parallel, and the upper and lower sides of each coupling strip are provided with sawtooth slots to match The saw-toothed protrusions are in the shape of saw teeth, and when matched, the saw-tooth protrusions are located in the saw-tooth grooves;

It also includes a T-shaped adjustment rod, an adjustment notch with an opening facing the first body is provided in the second body, and the horizontal section of the T-shaped adjustment rod is located in the adjustment notch;

Let the distance between the free end of the coupling strip and the inner side of the coupling groove be L, and set the horizontal distance between the free end of the horizontal section of the T-shaped adjustment rod and the inner side of the adjustment notch as M, and the L=M*3.75.

Wherein, one end of the first body is an arc surface, and the arc is the same as that of the first booster antenna.

Wherein, one end of the second body is an arc surface, and the arc is the same as that of the second booster antenna.

Wherein, the radians of the first booster antenna and the second booster antenna are the same, 60°-80°.

Wherein, one side of the first booster antenna is further provided with a third booster rod, and a free end of the third booster rod is provided with a third booster antenna.

Wherein, the curvature of the third gain rod is the same as that of the first gain rod.

Wherein, the height of the first body is less than 10 cm.

Wherein, the first antenna is provided with a strip-shaped isolation slot,

Wherein, the second antenna and the first antenna are provided with frequency increasing notches.

The beneficial effects of the utility model: 1. The reading distance is long, and the reading distance can reach 11-13m after testing. The reading distance of ordinary RFID tag antennas is less than 10m. 2. Stretchable; that is, the length can be adjusted. It can be used for complete packaging with a basically constant width but variable length, and has great practical value. 3. Various antennas have good performance, small standing wave ratio, low return loss, high gain and omnidirectionality. Its performance is high when it is used at ultra-high frequency (860-960MHz), especially at a frequency around 925MHz.

Description of drawings

Fig. 1 is the schematic diagram of the tag antenna of the present utility model;

Fig. 2 is a schematic diagram of the elongated tag antenna of the present invention;

Fig. 3 is a schematic diagram of the first antenna of the present utility model;

Fig. 4 is the second antenna schematic diagram of the present utility model;

Fig. 5 is the schematic diagram of utilizing the utility model;

Fig. 6 is the impedance test data diagram of the present utility model;

Fig. 7 is the return loss test data figure of the present utility model;

Fig. 8 is the directional test data figure of the utility model;

Explanation of reference numerals among Fig. 1 to Fig. 8:

1-first antenna; 11-coupling slot; 12-sawtooth slot; 13-first booster rod; 14-first booster antenna; 15-third booster rod; 16-third booster antenna; 17-isolation slot; 18 - boost notch;

2-Second antenna; 21-Coupling bar; 22-Sawtooth protrusion; 23-Second gain rod; 24-Second gain antenna; 25-Adjustment notch;

3-T-shaped adjustment lever;

4-Medium board;

5-Tag chip;

6- Substrate.

Detailed ways

The utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, and the scope of implementation of the utility model is not limited thereto.

As shown in Figures 1 to 8, a coupling capacitive RFID tag antenna with an isolation slot described in this embodiment includes a first antenna 1 and a second antenna 2, the first antenna 1 and the second antenna The distance between the two antennas 2 can be telescopically adjusted. The RFID tag made by it includes a substrate 6, and a coupling capacitive RFID tag antenna which is arranged on the substrate 6 and is provided with an isolation groove. The second antenna 2 is provided with a dielectric plate 4, and the dielectric plate 4 is provided with a label. Chip 5, the tag chip 5 is electrically connected to the antenna.

In the coupling capacitive RFID tag antenna described in this embodiment, the first antenna 1 includes a strip-shaped first body, and one end of the first body is provided with a first gain rod 13. The free end of the first booster rod 13 is provided with an arc-shaped first booster antenna 14, and also includes two coupling slots 11, the openings of the two coupling slots 11 are facing the other end of the first body, and the two coupling slots The grooves 11 are arranged in parallel in the first body, and the upper and lower sides of each coupling groove 11 are provided with saw-toothed grooves 12; the second antenna 2 includes a second body, and the length of the first body is longer than The second body, one end of the second body is provided with a second booster rod 23, and the free end of the second booster rod 23 is provided with an arc-shaped second booster antenna 24, and two antennas are arranged at the other end of the second body The coupling bar 21 that cooperates with the coupling groove 11, the two coupling bars 21 are arranged in parallel, and the upper and lower sides of each coupling bar 21 are provided with sawtooth-shaped serrated protrusions 22 that cooperate with the sawtooth groove 12. , the sawtooth protrusion 22 is located in the sawtooth groove 12; the coupling capacitance RFID tag antenna described in this embodiment is provided with an isolation groove, and also includes a T-shaped adjustment rod 3, and the second body is provided with a There is an adjustment notch 25 with an opening facing the first body, and the horizontal section of the T-shaped adjustment rod 3 is located in the adjustment notch 25; a coupling capacitive RFID tag antenna with an isolation groove inserted in this embodiment, The distance between the free end of the coupling strip 21 and the inner surface of the coupling groove 11 is L, and the horizontal distance between the free end of the horizontal section of the T-shaped adjusting rod 3 and the inner surface of the adjustment notch 25 is M, and the L=M *3.75.

This solution achieves a long reading distance through the above features, and its reading distance can reach 11-13m after testing. The reading distance of ordinary RFID tag antennas is less than 10m. In addition, it can be stretched; that is, the length can be adjusted, and it can be used in a complete set of packaging with a basically constant width but an indeterminate length. Finally, its various antennas have good performance, small standing wave ratio, low return loss, high gain and omnidirectionality. ; Its performance is higher when it is used at a frequency of about 925MHz. In the coupling capacitive RFID tag antenna provided with isolation slots in this embodiment, one end of the first body is an arc-shaped surface, and the arc is the same as that of the first booster antenna 14 . With such setting, the gain performance is further improved, the return loss is reduced, the omnidirectionality of radiation is increased, and the optimization result is better. In the coupling capacitive RFID tag antenna provided with isolation slots in this embodiment, one end of the second body is an arc surface, and the arc is the same as that of the second booster antenna 24 . The same radian can reduce the standing wave formation between the two antennas, reduce wave interference, and reduce the standing wave ratio. In the coupling capacitive RFID tag antenna provided with isolation slots in this embodiment, the arcs of the first booster antenna 14 and the second booster antenna 24 are the same, both being 60°-80°. Through simulation and actual experiments, the performance of the radian antenna is the best.

A coupling capacitive RFID tag antenna that is inserted with an isolation slot described in this embodiment, one side of the first booster antenna 14 is also provided with a third booster rod 15, and the free end of the third booster rod 15 is A third booster antenna 16 is provided; a coupling capacitive RFID tag antenna provided with an isolation slot is inserted in the present embodiment, and the arc of the third booster rod 15 is the same as that of the first gainer rod 13; In this way, the gain performance is further improved, the return loss is reduced, the radiation omnidirectionality is increased, and the optimization result is better.

In the coupling capacitive RFID tag antenna provided with isolation slots in this embodiment, the height of the first body is less than 10 cm. A coupling capacitive RFID tag antenna with isolation slots inserted in this embodiment, the first antenna 1 is provided with a strip-shaped isolation slot 17, and the isolation slot 17 is located between the two coupling slots 11 Between, a kind of coupling capacitive RFID label antenna that is provided with the isolation slot described in this embodiment, the two corners of the side of the second antenna 2 close to the first antenna 1 and the first antenna 1 close to the second antenna 2 The two corners of one side are provided with frequency increasing gap 18. The frequency-increasing notch 18 can increase the isolation, reduce the formation of standing waves, and make the standing wave ratio close to 1. The antenna of this solution also has good performance in omnidirectionality, as shown in FIG. 8 , it has excellent performance in omnidirectionality, and has 360-degree equidistant omnidirectionality with no dead angle. As shown in Figure 7, its return loss performance is outstanding, especially at 925MHz, the minimum value of return loss reaches -65dB, and the return loss in the entire high frequency band remains below -10dB, which exceeds the level of other similar antennas.

According to the test and design, its effective distance can reach 11-13m under different stretching lengths.

In addition, the input impedance of the antenna test is shown in Figure 6. The measured impedance is 11+144j ohms at 925MHz, which is conjugate matched with the impedance 11+143j of the chip Monza4Dura. The label can achieve the best effect at 925MHz.

The above is only a preferred embodiment of the utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the utility model patent application are included in the protection of the utility model patent application. within range.

Claims (8)

1. be provided with a coupling capacitance RFID label tag for isolation channel, it is characterized in that: comprise substrate (6), and be located at the coupling capacitance RFID label antenna that plugging together on substrate (6) is provided with isolation channel,

Described label antenna includes the first antenna (1) and the second antenna (2), the scalable adjustment of spacing of described first antenna (1) and the second antenna (2); Described second antenna (2) is provided with dielectric-slab (4), and dielectric-slab (4) is provided with label chip (5), and described label chip (5) and antenna are electrically connected;

Described first antenna (1) is provided with the isolation channel (17) of strip.

2. a kind of coupling capacitance RFID label tag being provided with isolation channel according to claim 1, it is characterized in that: the first antenna (1) includes strip the first noumenon, one end of described the first noumenon is provided with the first gain bar (13), the free end of described first gain bar (13) is provided with first gain antenna (14) of an arc, also include two coupling slots (11), described two coupling slot (11) openings are towards the other end of the first noumenon, described two coupling slots (11) are set in parallel in the first noumenon, the both sides up and down of described each coupling slot (11) are equipped with jagged serrated slot (12), described second antenna (2) includes one second body, the length of described the first noumenon is greater than the second body, one end of described second body is provided with the second gain bar (23), the free end of the second gain bar (23) is provided with second gain antenna (24) of an arc, also include two bars that are coupled (21) coordinated with coupling slot (11) that are that be located at the second body other end, described two couplings bar (21) be arranged in parallel, the both sides up and down of described each coupling bar (21) are equipped with the jagged serrate projections (22) coordinated with serrated slot (12), during cooperation, described serrate projections (22) is positioned at serrated slot (12),

Also include T-shaped adjusting rod (3), be provided with the adjustment recess (25) of an opening towards the first noumenon in described second body, the horizontal segment of described T-shaped adjusting rod (3) is positioned at and regulates recess (25);

If the distance of the free end of coupling bar (21) and the interior the inside of coupling slot (11) is L, if the free end of the horizontal segment of T-shaped adjusting rod (3) is M with the horizontal range of the interior the inside regulating recess (25), described L=M*3.75.

3. a kind of coupling capacitance RFID label tag being provided with isolation channel according to claim 2, is characterized in that: one end of described the first noumenon is arcwall face, and radian is identical with the radian of the first gain antenna (14).

4. a kind of coupling capacitance RFID label tag being provided with isolation channel according to claim 2, is characterized in that: one end of described second body is arcwall face, and radian is identical with the radian of the second gain antenna (24).

5. a kind of coupling capacitance RFID label tag being provided with isolation channel according to claim 2, is characterized in that: described first gain antenna (14) is identical with the radian of the second gain antenna (24), is 60 °-80 °.

6. a kind of coupling capacitance RFID label tag being provided with isolation channel according to claim 2, it is characterized in that: the side of described first gain antenna (14) is also provided with the 3rd gain bar (15), the free end of described 3rd gain bar (15) is provided with the 3rd gain antenna (16).

7. a kind of coupling capacitance RFID label tag being provided with isolation channel according to claim 6, is characterized in that: the radian of described 3rd gain bar (15) is identical with the radian size of the first gain bar (13).

8. a kind of coupling capacitance RFID label tag being provided with isolation channel according to claim 2, is characterized in that: the height of described the first noumenon is being less than 10cm.