CN218632439U

CN218632439U - RFID (radio frequency identification) broadband circularly polarized antenna and electronic terminal

Info

Publication number: CN218632439U
Application number: CN202222755574.2U
Authority: CN
Inventors: 刘硕; 刘小孟; 唐龙
Original assignee: Inpaq Technology Suzhou Co Ltd
Current assignee: Inpaq Technology Suzhou Co Ltd
Priority date: 2022-10-19
Filing date: 2022-10-19
Publication date: 2023-03-14
Anticipated expiration: 2032-10-19

Abstract

The utility model discloses a RFID broadband circular polarized antenna and electronic terminal relates to the technical field of antenna. The antenna comprises a radiation body, a feed network and a second PCB, wherein the radiation body is connected with the feed network through a feed connecting part, and the feed network is embedded in the second PCB; the radiation body comprises at least four radiation split bodies which are symmetrically arranged, the four radiation split bodies are symmetrically arranged relative to the center of the radiation body, and each radiation split body is connected with the feed network through a feed connection part. The utility model discloses this antenna has realized with the structure of self that the cover frequency channel is 856 ~ 876MHz to and realized good impedance match and circular polarization radiation, and the size is little, makes the range of application of antenna in this application wider.

Description

RFID (radio frequency identification) broadband circularly polarized antenna and electronic terminal

Technical Field

The utility model relates to a technical field of antenna, concretely relates to RFID broadband circular polarized antenna and electronic terminal.

Background

Currently, radio Frequency Identification (RFID) technology is being applied to various industries as a non-contact automatic Identification technology. With the development of radio frequency technology, radio frequency identification products have been widely applied in real life, such as car management systems in parking lots, automatic toll collection systems without parking, personnel management, electronic anti-counterfeiting, logistics monitoring, production automation management, and the like.

Based on the application trend, the performance of the RFID reader-writer antenna has important significance for improving the performance of the whole identification system. In many tags identification application, require to read the ware antenna and have good circular polarization characteristic, avoid the polarization mismatch to lead to missing the condition of reading to take place, need read the ware antenna this moment and have great identification range, big enough in order to cover the label that awaits measuring, require to read the ware antenna and have certain broadband characteristic, avoid because of environmental impact, resonant frequency receives the influence and produces the skew, may lead to not reading the label.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one problem mentioned in the above-mentioned background art, the utility model provides a RFID broadband circular polarized antenna and electronic terminal, this antenna has realized with the structure of self that the cover frequency channel is 856 ~ 876MHz to and realized good impedance match and circular polarization radiation, and the size is little, makes the range of application of the antenna in this application wider.

The embodiment of the utility model provides a specific technical scheme as follows:

in a first aspect, an RFID broadband circularly polarized antenna includes: the radiation body is connected with the feed network through a feed connecting part, and the feed network is embedded in the second PCB.

In a specific embodiment, the radiation body includes at least four radiation split bodies symmetrically arranged, the four radiation split bodies are all embedded in the second PCB and are symmetrically arranged with respect to the center of the second PCB, and each radiation split body is connected to the feed network through a feed connection portion.

In a specific embodiment, the feed connection portion includes at least four connection columns, the connection columns are connected with the radiation splitting bodies in a one-to-one correspondence, and the other ends of the connection columns, which are far away from the radiation splitting bodies, are connected with the feed network.

In a specific embodiment, two of the connecting posts are arranged parallel to each other.

In a specific embodiment, the radiation split body includes a first radiation trace which is continuously bent, the first radiation trace is continuously bent to form a plurality of first gaps, a depth direction of the first gaps is perpendicular to a length direction of the first radiation trace, and the first gaps are parallel to each other along the depth direction.

In a specific embodiment, the feed network is integrally formed, and an extension section is correspondingly arranged at the edge of the feed network and is used for being connected with the connecting column.

In a specific embodiment, a power divider is further installed on one side of the radiation body close to the feed network, and the power divider is arc-shaped.

In a specific embodiment, the second PCB is a dielectric substrate, and the dielectric constant of the second PCB is 2.8-3.0 normal/meter; preferably, the second PCB has a dielectric constant of 2.98 f/m.

In a specific embodiment, the antenna body is formed by the radiating body, the feed network and the second PCB, and the antenna body is cuboid, 59.8 to 60.2mm long, 59.8 to 60.2mm wide and 14.6 to 15mm high.

In a second aspect, there is provided an electronic terminal comprising an RFID broadband circularly polarized antenna as described above.

The embodiment of the utility model provides a following beneficial effect has:

1. the embodiment of the utility model provides a RFID broadband circular polarized antenna, it is main including radiating the body, feed network and second PCB board, wherein the radiation body passes through feed connecting portion and feed network connection, feed network inlays and establishes in the second PCB board, design through the antenna in this application, realized covering the frequency channel for 856 ~ 876 MHz's scope with the structure of this antenna self, and realized good impedance match and circular polarized radiation, and the size is little, high efficiency, make the range of application of the antenna in this application more extensive.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 shows a schematic view of the overall structure of an antenna according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a structure for embodying the radiating body in the present application;

fig. 3 is a schematic structural diagram of a feed network embodying the present application;

FIGS. 4 and 5 are schematic diagrams of test results for S-parameters embodying the antenna in the present application;

FIGS. 6 and 7 are graphs of the results of 2D to axis ratios for antennas embodying the present application;

in the figure, 1, a radiation body; 2. a feed network; 3. a second PCB board; 4. a feed connection portion; 5. radiating the split body; 6. connecting columns; 7. a first radiating trace; 8. a first void; 9. an extension section; 10. a first PCB board.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As described in the background, the performance of an RFID reader antenna is of great significance in improving the performance of the overall identification system. In many tags identification application, require to read the ware antenna and have good circular polarization characteristic, avoid the polarization mismatch to lead to missing the condition of reading to take place, need read the ware antenna this moment and have great identification range, big enough in order to cover the label that awaits measuring, require to read the ware antenna and have certain broadband characteristic, avoid because of environmental impact, resonant frequency receives the influence and produces the skew, may lead to not reading the label. Based on the above problems, the present application provides an RFID broadband circularly polarized antenna and an electronic terminal, where the antenna uses its own structure to realize a coverage band of 856 to 876MHz, and to realize good impedance matching and circularly polarized radiation, and has a small size, so that the application range of the antenna in the present application is wider.

Example one

An RFID broadband circularly polarized antenna, as shown in fig. 1 and 2, comprising: the radiation device comprises a radiation body 1, a feed network 2 and a second PCB 3, wherein the radiation body 1 is connected with the feed network 2 through a feed connecting part 4, and the feed network 2 is embedded in the second PCB 3. The radiation body 1, the feed connection part 4 and the feed network 2 are distributed in sequence from top to bottom, wherein the radiation body 1 is rectangular and is arranged above the feed connection part 4, and the feed network 2 is rectangular and is connected to the bottom end of the feed connection part 4.

As shown in fig. 2, the radiation body 1 is square, and includes four radiation split bodies 5 and a first PCB 10, the four radiation split bodies 5 are symmetrically disposed about the center of the radiation body 1, the four radiation split bodies 5 are all embedded in the first PCB 10, the four radiation split bodies 5 are symmetrically disposed on four edges of the first PCB 10, and each radiation split body 5 is connected to the feed network 2 through the feed connection portion 4. The feed connecting portion 4 comprises four connecting columns 6, the four connecting columns 6 are respectively and correspondingly arranged at the edge of the feed network 2 and are in one-to-one correspondence with the radiation split bodies 5, the upper ends of the connecting columns 6 are respectively connected with the corresponding radiation bodies 1, and the lower ends of the connecting columns 6 are connected with the feed network 2.

In a specific embodiment, the connection post 6 is "h" shaped, four connection posts 6 are arranged in parallel, and the connection posts 6 are perpendicular to the plane of the radiation body 1 and the plane of the feeding network 2.

In a specific embodiment, the radiation splitting body 5 includes a first radiation trace 7 that is continuously bent, the bending angle is 90 °, the first radiation trace 7 is continuously bent to form a plurality of first gaps 8, the depth direction of the first gaps 8 is perpendicular to the length direction of the first radiation trace 7, and the plurality of first gaps 8 are parallel to each other along the depth direction.

In a specific embodiment, as shown in fig. 3, the feeding network 2 is integrally formed in an irregular curved shape, and the feeding network 2 is embedded in the second PCB 3, the second PCB 3 is square, and the size of the second PCB 3 is 60 × 60mm. And correspondingly, an extension section 9 is arranged at the edge of the feed network 2, and the extension section 9 is used for being connected with the bottom of the connecting column 6. The second PCB 3 is a dielectric substrate having a dielectric constant of 2.98 f/m. The selection of the above plates reduces the cost of the antenna.

In order to make the size of the antenna body composed of the radiation body 1, the feed network 2 and the second PCB 3 as small as possible, a power divider is further installed on one side of the radiation body 1 close to the feed network 2, and the specific power divider is arc-shaped. In addition, the antenna in this embodiment is fed by the power divider with a phase difference of 90 degrees, and the antenna is mounted below the radiation body 1 by the gradually changing arc-shaped power divider, so that the antenna is compact and miniaturized. The antenna body is composed of a radiation body 1, a feed network 2 and a second PCB 3, and is cuboid, and the antenna body is 60mm long, 60mm wide and 14.8mm high.

As shown in table 1, the efficiency of the antenna in this embodiment was tested, and the results obtained are as follows:

as can be seen from the data in table 1, in this embodiment, the efficiency of the antenna in the frequency bands of 861 to 871Mhz is kept to be over 74%, and the average efficiency in the frequency bands of 861 to 871Mhz is 75%, so that good impedance matching and circular polarization radiation can be achieved, and the efficiency of the antenna structure of the present application can meet the requirement.

Further, as shown in fig. 4 to 7, when the S parameter and the 2D axial ratio of the antenna in this embodiment are tested, according to the test result, it can be seen that the resonant depth of the antenna in this embodiment is 41.57dB, the coverage frequency band of the antenna includes a frequency band range of 856 to 876MHz, the impedance bandwidth of the specific antenna is 856 to 876MHz, and the 3dB axial ratio bandwidth is 856 to 876MHz; the circularly polarized gain of the antenna is 3.7dBi at 866MHz, and the front-to-back ratio is 5.11dB. The antenna also provides a stable and symmetrical radiation pattern and a 3dB axial ratio beam width as wide as 130 degrees, and by the antenna structure, good impedance matching and circularly polarized radiation are realized, and the antenna is small in size, so that the application range of the antenna is wider.

Example two

Corresponding to the above embodiments, the present application provides an electronic terminal, where the electronic terminal includes the above-mentioned RFID broadband circularly polarized antenna, including: the radiation device comprises a radiation body 1, a feed network 2 and a second PCB 3, wherein the radiation body 1 is connected with the feed network 2 through a feed connecting part 4, and the feed network 2 is embedded in the second PCB 3. The radiation body 1, the feed connection part 4 and the feed network 2 are distributed in sequence from top to bottom, wherein the radiation body 1 is rectangular and is arranged above the feed connection part 4, and the feed network 2 is rectangular and is connected to the bottom end of the feed connection part 4.

While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the true scope of the embodiments of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. An RFID broadband circularly polarized antenna, comprising: the antenna comprises a radiation body (1), a feed network (2) and a second PCB (3), wherein the radiation body (1) is connected with the feed network (2) through a feed connecting part (4), and the feed network (2) is embedded in the second PCB (3).

2. The RFID broadband circular polarized antenna according to claim 1, wherein the radiating body (1) comprises at least four radiating sub-bodies (5) and a first PCB (10) which are symmetrically arranged, the four radiating sub-bodies (5) are embedded in the first PCB (10) and are symmetrically arranged with respect to the center of the first PCB (10), and each radiating sub-body (5) is connected with the feed network (2) through a feed connection part (4).

3. The RFID broadband circularly polarized antenna according to claim 2, wherein the feed connection portion (4) comprises at least four connection columns (6), the connection columns (6) are connected with the radiation split body (5) in a one-to-one correspondence, and the other ends of the connection columns (6) far away from the radiation split body (5) are connected with the feed network (2).

4. An RFID broadband circularly polarized antenna according to claim 3, characterized in that two connecting studs (6) are arranged parallel to each other.

5. The RFID broadband circularly polarized antenna according to claim 3, wherein the radiation split body (5) comprises a first radiation trace (7) which is continuously bent, the first radiation trace (7) is continuously bent to form a plurality of first gaps (8), the depth direction of the first gaps (8) is perpendicular to the length direction of the first radiation trace (7), and the plurality of first gaps (8) are parallel along the depth direction.

6. The RFID broadband circularly polarized antenna according to claim 5, wherein the feeding network (2) is integrally formed, and an extension (9) is correspondingly arranged at the edge of the feeding network (2), and the extension (9) is used for connecting with the connecting column (6).

7. The RFID broadband circularly polarized antenna according to claim 6, wherein a power divider is further installed on one side of the radiating body (1) close to the feeding network (2), and the power divider is arc-shaped.

8. The RFID broadband circular polarized antenna according to claim 7, wherein the second PCB (3) is a dielectric substrate, and the dielectric constant of the second PCB (3) is 2.8-3.0 Farad/m.

9. The RFID broadband circular polarized antenna according to claim 8, wherein the antenna body is composed of the radiation body (1), the feeding network (2) and the second PCB (3), and has a rectangular parallelepiped shape with a length of 59.8-60.2 mm, a width of 59.8-60.2 mm and a height of 14.6-15 mm.

10. An electronic terminal, characterized in that it comprises an RFID broadband circularly polarized antenna according to any of claims 1 to 9.