CN208421867U - A kind of RFID tag - Google Patents

Abstract

The utility model provides a kind of RFID tag, including first antenna, the first matching network, filter, the second matching network and RFID label chip；Wherein, first antenna is connect with one end of the first matching network, the other end of first matching network and one end of filter connect, the other end of filter is connect with one end of the second matching network, the other end of second matching network and the first input port of RFID label chip connect, the second input port ground connection of RFID label chip.The RFID tag of the utility model, by the first matching network and the second matching network, it can guarantee the impedance matching of filter Yu first antenna and RFID label chip, to guarantee when being introduced into monitoring indoor distribution passive device in passive indoor distributed system, wherein filter inhibits the ability of the high and low frequency interference signal outside working band, promotes the interference free performance of RFID tag.

Description

A kind of RFID tag

Technical field

The utility model relates to radio frequency identification (Radio Frequency Identification, RFID) technical field, More particularly to a kind of RFID tag.

Background technique

With the fast development of wireless communication technique, RFID technique is as a kind of efficient monitoring and recognition methods by more next More people are used.RFID is a kind of contactless automatic identification technology, is related to chip, antenna, wireless receiving and dispatching, data and becomes It changes and encodes and numerous ambits such as electromagnetic wave and electromagnetic field.With bar code identification technology, magnetic card identification technology and IC card Identification technology etc. is compared, RFID with its distinctive untouchable, strong antijamming capability, can identify the advantages that multiple objects simultaneously, It has been increasingly becoming one of fitst water in automatic identification family and widest technology of application field.

Existing RFID tag has broadband character, with two RFID communication frequency range (840- for supporting national standard to define simultaneously 845MHz and 920-925MHz).Other communication letters since RFID communication uses near field communication technology, around application environment Number due to wireless channel be lost, generally will not influence RFID normal communication.But when existing RFID tag is introduced passive interior When monitoring indoor distribution passive device in compartment system, indoor communications signal (such as GSM900) can cause RFID communication very strong Interference, cause the anti-interference of RFID tag poor.

Utility model content

The utility model embodiment provides a kind of RFID tag, to solve existing RFID tag in passive indoor distribution system When monitoring indoor distribution passive device in system, the problem of anti-interference difference.

In order to solve the above-mentioned technical problem, the utility model embodiment provides a kind of RFID tag, including first antenna, First matching network, filter, the second matching network and RFID label chip；

Wherein, the first antenna is connect with one end of first matching network, first matching network it is another End is connect with one end of the filter, and the other end of the filter is connect with one end of second matching network, described The other end of second matching network is connect with the first input port of the RFID label chip, and the of the RFID label chip Two input ports ground connection.

Optionally, the first antenna is plane microstrip antenna.

Optionally, the first input port and second input port are Differential Input port.

Optionally, second input port is grounded by the second antenna ground, or by sheet metal.

Optionally, second antenna is plane microstrip antenna.

Optionally, first matching network includes at least one matching device.

Optionally, at least one the described connection type of matching device in the RFID tag is series connection and/or parallel connection.

Optionally, second matching network includes at least one matching device.

Optionally, at least one the described connection type of matching device in the RFID tag is series connection and/or parallel connection.

Optionally, the matching device is capacitor or inductance.

The first matching network is arranged in the RFID tag of the utility model embodiment between first antenna and filter, with And the second matching network is set between filter and RFID label chip, it can guarantee that filter and first antenna and RFID are marked The impedance matching of chip is signed, thus guarantee when being introduced into monitoring indoor distribution passive device in passive indoor distributed system, Wherein filter inhibits the ability of the high and low frequency interference signal outside working band, promotes the interference free performance of RFID tag.

Detailed description of the invention

It, below will be in the utility model embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only the one of the utility model A little embodiments for those of ordinary skill in the art without any creative labor, can also be according to this A little attached drawings obtain other attached drawings.

Fig. 1 is the structural schematic diagram of the RFID tag of the utility model embodiment；

Fig. 2A, Fig. 2 B, Fig. 2 C, Fig. 2 D and Fig. 2 E are the structural representation of first matching network of the utility model embodiment Figure；

Fig. 3 A and Fig. 3 B are the structural schematic diagram of the matching device of the utility model embodiment；

Fig. 4 is one of the schematic diagram of the single polarization all-around top absorbing antenna of the integrated rfid-tag of the utility model embodiment；

Fig. 5 is the two of the schematic diagram of the single polarization all-around top absorbing antenna of the integrated rfid-tag of the utility model embodiment；

Fig. 6 is the three of the schematic diagram of the single polarization all-around top absorbing antenna of the integrated rfid-tag of the utility model embodiment；

Fig. 7 is the enhancing edges cover type single polarization all-around top absorbing antenna of the integrated rfid-tag of the utility model embodiment Schematic diagram；

Fig. 8 is one of the schematic diagram of bipolar omni-directional ceiling antenna of integrated rfid-tag of the utility model embodiment；

Fig. 9 is the two of the schematic diagram of the bipolar omni-directional ceiling antenna of the integrated rfid-tag of the utility model embodiment；

Figure 10 is that the single polarization of the integrated rfid-tag of the utility model embodiment orients the schematic diagram of wall aerial.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model It clearly and completely describes, it is clear that the embodiments are a part of the embodiments of the present invention, rather than whole implementation Example.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts The every other embodiment obtained, fall within the protection scope of the utility model.

Shown in Figure 1, the utility model embodiment provides a kind of RFID tag 10, which includes first Antenna 11, the first matching network 12, filter 13, the second matching network 14 and RFID label chip 15.

Wherein, first antenna 11 is connect with one end of the first matching network 12, the other end of the first matching network 12 and filter One end of wave device 13 connects, and first matching network 12 is used to guarantee the impedance between first antenna 11 and filter 13 Match.

The other end of filter 13 is connect with one end of the second matching network 14, the other end of the second matching network 14 with The first input port 151 of RFID label chip 15 connects, the second input port 152 ground connection of RFID label chip 15, described Second matching network 14 is used to guarantee the impedance matching between filter 13 and RFID label chip 15.

The first pair net is arranged in the RFID tag 10 of the utility model embodiment between first antenna 11 and filter 13 Network 12, and the second matching network 14 is set between filter 13 and RFID label chip 15, can guarantee filter 13 with The impedance matching of first antenna 11 and RFID label chip 15, to guarantee to work as to be introduced into passive indoor distributed system to monitor When indoor distribution passive device, wherein filter 13 inhibits the ability of the high and low frequency interference signal outside working band, is promoted The interference free performance of RFID tag.

In the utility model embodiment, optionally, first antenna 11 can be plane microstrip antenna.

In the utility model embodiment, optionally, first input port 151 and the second input port 152 can be defeated for difference Inbound port, in this way by this two Differential Input ports, it can be achieved that RFID tag is to the rejection ability of common mode interference signal.

In the utility model embodiment, optionally, the second input port 142 can be by the second antenna ground, or passes through Sheet metal ground connection.Further alternative, which can be plane microstrip antenna, which can be copper sheet etc., this is practical New embodiment is limited not to this.

It is noted that the antenna type of the first antenna and second antenna can be identical in practical application It is different.It is grounded compared to the second input port 142 by sheet metal, when the second input port 142 passes through the second antenna ground, Since the second antenna can receive signal, corresponding RFID tag is enabled to realize the increase in entire gain, such as when the When two antennas are selected as plane microstrip antenna, 3dB can be increased about in entire gain.

In the utility model embodiment, optionally, referring to fig. 2 shown in A to Fig. 2 E, the first matching network 12 may include at least One matching device 121, further at least one connection type of the matching device 121 in RFID tag 10 can be series connection And/or it is in parallel.For example, in fig. 2, the first matching network 12 includes a matching device 121, this matching device 121 exists Connection type in RFID tag 10 is series connection, i.e., is connected in series with first antenna 11 and filter 13；In fig. 2b, first Distribution network 12 includes two matching devices 121, this two connection types of the matching devices 121 in RFID tag 10 be series connection with Parallel connection is connect in series and parallel with first antenna 11 and filter 13；In fig. 2 c, the first matching network 12 includes an adaptation Part 121, this connection type of the matching device 121 in RFID tag 10 is parallel connection, i.e., with first antenna 11 and filter 13 are connected in parallel；In figure 2d, the first matching network 12 includes two matching devices 121, this two matching devices 121 are in RFID Connection type in label 10 is series connection and parallel connection, i.e., connect in series and parallel with first antenna 11 and filter 13；In Fig. 2 E, the One matching network 12 includes three matching devices 121, and connection type of this three matching devices 121 in RFID tag 10 is string Connection and parallel connection, i.e., connect in series and parallel with first antenna 11 and filter 13.

It is noted that the structure similar with the first matching network 12 can be used in the second matching network 14, i.e., using as schemed Structure shown in 2A to Fig. 2 E.That is, the second matching network 14 may also comprise at least one matching device 121, further This at least one connection type of matching device 121 in RFID tag 10 can be series connection and/or in parallel.It is marked as in RFID The structure of the first matching network 12 and the second matching network 14 realized in label 10, generally with first antenna 11, filter 13 and The port impedance characteristic of alternating current of RFID label chip 15 is related.

Optionally, referring to shown in Fig. 3 A to Fig. 3 B, which can be capacitor or inductance.

It should be understood that it can be made to have event after the RFID tag of the utility model embodiment is for no source chamber divided antenna Hinder monitoring function, and not will receive the interference of GSM900 downlink signal.In addition, the RFID tag of the utility model embodiment can For a variety of no source chamber divided antennas, as shown in Fig. 4 to Figure 10.Specifically, the integrated RFID that Fig. 4 is the utility model embodiment is marked One of the schematic diagram of the single polarization all-around top absorbing antenna of label, Fig. 5 are the monopole of the integrated rfid-tag of the utility model embodiment Change two, Fig. 6 of the schematic diagram of all-around top absorbing antenna to inhale for the single polarization omnidirectional of the integrated rfid-tag of the utility model embodiment Three, Fig. 7 of the schematic diagram of antenna is pushed up as the enhancing edges cover type single polarization of the integrated rfid-tag of the utility model embodiment The schematic diagram of all-around top absorbing antenna, Fig. 8 are the bipolar omni-directional ceiling antenna of the integrated rfid-tag of the utility model embodiment One of schematic diagram, Fig. 9 is the schematic diagram of the bipolar omni-directional ceiling antenna of the integrated rfid-tag of the utility model embodiment Two, Figure 10 be the utility model embodiment integrated rfid-tag single polarization orient wall aerial schematic diagram.

The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art For art personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these improve and Retouching also should be regarded as the protection scope of the utility model.

Claims (10)

1. a kind of RFID tag, which is characterized in that including first antenna, the first matching network, filter, the second matching network and RFID label chip；

Wherein, the first antenna is connect with one end of first matching network, the other end of first matching network with One end of the filter connects, and the other end of the filter is connect with one end of second matching network, and described second The other end of matching network is connect with the first input port of the RFID label chip, and the second of the RFID label chip is defeated Inbound port ground connection.

2. RFID tag according to claim 1, which is characterized in that the first antenna is plane microstrip antenna.

3. RFID tag according to claim 1, which is characterized in that the first input port and second input terminal Mouth is Differential Input port.

4. RFID tag according to claim 1, which is characterized in that second input port is connect by the second antenna Ground, or be grounded by sheet metal.

5. RFID tag according to claim 4, which is characterized in that second antenna is plane microstrip antenna.

6. RFID tag according to claim 1, which is characterized in that first matching network includes at least one matching Device.

7. RFID tag according to claim 6, which is characterized in that at least one described matching device is marked in the RFID Connection type in label is series connection and/or parallel connection.

8. RFID tag according to claim 1, which is characterized in that second matching network includes at least one matching Device.

9. RFID tag according to claim 8, which is characterized in that at least one described matching device is marked in the RFID Connection type in label is series connection and/or parallel connection.

10. RFID tag according to any one of claims 6 to 9, which is characterized in that the matching device be capacitor or Person's inductance.