Antenna and communication equipment

Abstract

The invention provides an antenna and communication equipment. The antenna comprises first radiation units working at a first frequency band, wherein the two first radiation units are arranged at an interval; the second radiation units work in a second frequency band, the two second radiation units are arranged at intervals and located between the two first radiation units, and the distance between the first radiation units and the second radiation units is smaller than or equal to one fourth of the wavelength of the second radiation units; wherein the frequency of the first frequency band is greater than that of the second frequency band; when one first radiation unit works, the second radiation unit adjacent to the first radiation unit in the working state presents inductive impedance and serves as a reflector, and radiation of the first radiation unit in the working state towards the other first radiation unit is weakened. When one second radiation unit works, the first radiation unit adjacent to the second radiation unit in the working state is in capacitive impedance and serves as a director, and radiation of the second radiation unit in the working state towards the other second radiation unit is weakened.

Description

Technical Field

[0001] This application relates to the field of antenna technology, and more particularly to an antenna and communication device. Background Technology

[0002] With the development of communication technology, wireless network cards are required to cover dual-band operating frequencies simultaneously, such as both 2G and 5G. To meet this requirement, related technologies use two radiating elements for each of the two different frequency bands, and then set up a decoupling structure between the radiating elements to maintain good isolation within the same frequency band.

[0003] However, decoupling structures occupy more space, increasing the overall size of the antenna and reducing its versatility and competitiveness. Summary of the Invention

[0004] This application provides an antenna and communication device that can maintain good co-channel isolation, occupy a small space, and is applicable to a wide range of application scenarios.

[0005] In a first aspect, this application provides an antenna, comprising: a first radiating element operating in a first frequency band, wherein two first radiating elements are spaced apart; and a second radiating element operating in a second frequency band, wherein two second radiating elements are spaced apart and located between the two first radiating elements, wherein the distance between the first radiating elements and the second radiating elements is less than or equal to one-quarter of the wavelength of the second radiating element; wherein the frequency of the first frequency band is greater than the frequency of the second frequency band; when one first radiating element is operating, the second radiating element adjacent to the operating first radiating element acts as an inductive impedance in the first frequency band and serves as a reflector, thereby reducing the radiation from the operating first radiating element toward the other first radiating element; when one second radiating element is operating, the first radiating element adjacent to the operating second radiating element acts as a capacitive impedance in the second frequency band and serves as a director, thereby reducing the radiation from the operating second radiating element toward the other second radiating element.

[0006] In some embodiments, the size of the first radiating element is smaller than that of the second radiating element, and the first feed port of the first radiating element and the second feed port of the second radiating element both face the same side.

[0007] In some embodiments, a parasitic element is further included, the resonant frequency of which is tuned to the second frequency band, the parasitic element being disposed between the two second radiating elements to absorb near-field coupling energy between the two second radiating elements.

[0008] In some embodiments, the circuit board is further included, wherein the first radiating unit, the second radiating unit and the parasitic member are disposed on one side of the circuit board, the parasitic member has a first parasitic portion located between the two second radiating units and a second parasitic portion disposed on both sides of the first parasitic portion, the two second parasitic portions extending in opposite directions, and the parasitic member is bent so that its own projection is located within the projection of the circuit board on the same projection plane parallel to the circuit board.

[0009] In some embodiments, with the extension direction of the first parasitic portion as the axis of symmetry, two first radiation units are symmetrically arranged, two second radiation units are symmetrically arranged, and two second parasitic portions are symmetrically arranged.

[0010] In some embodiments, the circuit board and an electromagnetic balancing network are further included. The first radiation unit and the second radiation unit are disposed on one side of the circuit board, and the electromagnetic balancing network is disposed on the other side of the circuit board. The electromagnetic balancing network is used to suppress the coupling between the first radiation unit and the second radiation unit.

[0011] In some embodiments, the circuit board has a first metallized via and a second metallized via penetrating through itself, and the two ends of the electromagnetic balance network are respectively connected to the first metallized via and the second metallized via.

[0012] In some embodiments, the circuit board and grounding element are further included. The first radiating element and the second radiating element are disposed on one side of the circuit board, and the grounding element is disposed on the other side of the circuit board and in contact with the ground. The length of the grounding element is greater than the distance between the two second radiating elements, and the projection of the grounding element and the projection of the second radiating element coincide on the same projection plane parallel to the circuit board.

[0013] In some embodiments, the first radiating unit includes a first body portion and a first branch portion connected to each other, the first branch portion being located on one side of the first body portion; and / or, the second radiating unit includes a second body portion and two second branch portions connected to each other, the two second branch portions being located on both sides of the second body portion and symmetrically arranged.

[0014] Secondly, this application also provides a communication device, including: the antenna as described above.

[0015] The antenna provided in this application, because the operating frequency of the first radiating element is higher than that of the second radiating element, and the distance between the first and second radiating elements is less than or equal to one-quarter of the wavelength of the second radiating element, constitutes a directional antenna similar to a Yagi-Uda antenna. When the antenna operates in different frequency bands, it can dynamically realize the function of the first radiating element as a director and the function of the second radiating element as a reflector, directionally constraining the radiation, thereby improving the co-frequency isolation between the two first radiating elements and the co-frequency isolation between the two second radiating elements. Furthermore, since the first and second radiating elements themselves are used to improve the co-frequency isolation without the need for additional decoupling structures, the space occupied is smaller, which is beneficial for antenna miniaturization and a wider range of applications. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the antenna provided in an embodiment of this application from a certain viewing angle; Figure 2 This is a schematic diagram of the antenna provided in an embodiment of this application from another perspective; Figure 3 This is a schematic diagram of an antenna with a hidden circuit board provided in an embodiment of this application; Figure 4 This is a three-dimensional schematic diagram of an antenna with a hidden circuit board provided in an embodiment of this application; Figure 5 This is a schematic diagram of a 4×4 MIMO antenna provided in an embodiment of this application; Figure 6 This is a graph reflecting the reflection coefficient and isolation of two 5G radiating units in one embodiment provided in this application. Figure 7 This is a graph reflecting the reflection coefficient and isolation of two 2G radiating elements in one embodiment provided in this application. Figure 8 This is a graph reflecting the inter-frequency isolation between the 5G radiating unit and the 2G radiating unit in one embodiment provided in this application; Figure 9 This is a line graph reflecting the radiation efficiency of the 5G radiation unit and the 2G radiation unit in one embodiment provided in this application. Figure 10 This is a diagram reflecting the current distribution when the 2G radiating unit is working in one embodiment of this application.

[0017] Figure Labels 10. First radiating unit; 11. First feed port; 12. First body part; 13. First branch part; 20. Second radiating unit; 21. Second feed port; 22. Second body part; 23. Second branch part; 30. Parasitic component; 31. First parasitic part; 32. Second parasitic part; 40. Circuit board; 50. Electromagnetic balance network; 61. First metallized via; 62. Second metallized via; 70. Grounding component; 80. Ground. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0022] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0023] The following is a detailed description of this application.

[0024] Firstly, such as Figure 1 , Figures 3 to 5 As shown, this application provides an antenna, including: a first radiating element 10 operating in a first frequency band, with two first radiating elements 10 spaced apart; and a second radiating element 20 operating in a second frequency band, with two second radiating elements 20 spaced apart and located between the two first radiating elements 10, the distance between the first radiating elements 10 and the second radiating elements 20 being less than or equal to one-quarter of the wavelength of the second radiating element 20; wherein, the frequency of the first frequency band is greater than the frequency of the second frequency band; when one first radiating element 10 is operating, the second radiating element 20 adjacent to the operating first radiating element 10 acts as an inductive impedance in the first frequency band, serving as a reflector to reduce the radiation of the operating first radiating element 10 toward the other first radiating element 10; when one second radiating element 20 is operating, the first radiating element 10 adjacent to the operating second radiating element 20 acts as a capacitive impedance in the second frequency band, serving as a director to reduce the radiation of the operating second radiating element 20 toward the other second radiating element 20.

[0025] The antenna includes two first radiating elements 10 and two second radiating elements 20. There are two first radiating elements 10, spaced apart from each other. There are also two second radiating elements 20, spaced apart from each other. The distance between the two second radiating elements 20 is less than the distance between the two first radiating elements 10, placing the two second radiating elements 20 between the two first radiating elements 10. In other words, the two first radiating elements 10 are located on the outermost sides, and the two second radiating elements 20 are located on the side where the first radiating elements 10 are closest to each other. The two first radiating elements 10 and the two second radiating elements 20 are symmetrically arranged, and their axes of symmetry are the same.

[0026] The operating frequencies of the first radiating unit 10 and the second radiating unit 20 are different. The first radiating unit 10 operates in a first frequency band, and the second radiating unit 20 operates in a second frequency band. The frequency of the first frequency band is greater than the frequency of the second frequency band. For example, in one embodiment, the first radiating unit 10 can be a 5G radiating unit, and the second radiating unit 20 can be a 2G radiating unit; in another embodiment, the first radiating unit 10 can be a 5G radiating unit, and the second radiating unit 20 can be a 4G radiating unit; in yet another embodiment, the first radiating unit 10 can be a 4G radiating unit, and the second radiating unit 20 can be a 3G radiating unit.

[0027] The first radiating unit 10 and the second radiating unit 20 are radiating units of the same type. This application does not make any special limitation on the specific type of the first radiating unit 10 and the second radiating unit 20. For example, the first radiating unit 10 and the second radiating unit 20 can be a dipole radiating unit, a monopole radiating unit, a spiral radiating unit, etc.

[0028] In some embodiments, the first radiating element 10 and the second radiating element 20 are both monopole radiating elements, each using the ground 80 as a mirror image. Compared to other types of radiating elements, their size can be constructed to be smaller, thereby helping to reduce the size of the antenna.

[0029] Furthermore, to achieve standing wave optimization, at least one radiating branch needs to be added. See further... Figure 1 , Figures 3 to 5 In one embodiment, the first radiating unit 10 includes a first body portion 12 and a first branch portion 13 connected to each other, with the first branch portion 13 located on one side of the first body portion 12. Specifically, the first body portion 12 is straight, and the first branch portion 13 is bent into an "L" shape. The size of the first body portion 12 is larger than that of the first branch portion 13, and the first branch portion 13 is disposed on the side of the first body portion 12 near the second radiating unit 20, making the first radiating unit 10 "h" shaped.

[0030] In another embodiment, the second radiating unit 20 includes a second body portion 22 and two second branch portions 23 connected to each other. The two second branch portions 23 are located on both sides of the second body portion 22 and are symmetrically arranged. Specifically, the second body portion 22 is straight, and there are two second branch portions 23, each of which is bent into an "L" shape. The size of the second body portion 22 is larger than that of the second branch portions 23. The two second branch portions 23 are respectively disposed on both sides of the second body portion and are symmetrically arranged, making the second radiating unit 20 resemble a "mountain".

[0031] Thus, by constructing radiating branches, more resonant points are created, enabling the first radiating unit 10 and the second radiating unit 20 to cover a wider frequency band or multiple discrete frequency bands.

[0032] The operating frequency of the first radiating element 10 is greater than that of the second radiating element 20, that is, the wavelength of the first radiating element 10 is less than that of the second radiating element 20. In order to form an open resonant structure, the size of the first radiating element 10 is generally smaller than that of the second radiating element 20.

[0033] In some embodiments, the size of the first radiating element 10 is smaller than that of the second radiating element 20, and the first feed port 11 of the first radiating element 10 and the second feed port 21 of the second radiating element 20 both face the same side. When the type of the first radiating element 10 and the type of the second radiating element 20 are both monopole radiating elements, the first feed port 11 of the first radiating element 10 and the second feed port 21 of the second radiating element 20 can both face the ground 80.

[0034] Since the operating frequency of the first radiating element 10 is greater than that of the second radiating element 20 (i.e., the size of the first radiating element 10 is smaller than that of the second radiating element 20, and the distance between the first radiating element 10 and the second radiating element 20 is less than or equal to one-quarter of the wavelength of the second radiating element 20), the first radiating element 10 and the second radiating element 20 constitute a directional antenna similar to a Yagi-Uda antenna. When the first radiating element 10 is working, the second radiating element 20, which is larger than the first radiating element 10, acts as a reflector with inductive impedance in the first frequency band, reflecting the radiated energy from the first radiating element 10 toward the second radiating element 20 back, thus weakening the radiation from the first radiating element 10 toward the second radiating element 20 and strengthening the radiation from the first radiating element 10 away from the second radiating element 20. When the second radiation unit 20 is working, the first radiation unit 10, which is smaller in size than the second radiation unit 20, acts as a director in the second frequency band with capacitive impedance, guiding the radiation energy of the second radiation unit 20 to the first radiation unit 10, thereby enhancing the radiation of the second radiation unit 20 in the direction toward the first radiation unit 10 and weakening the radiation of the second radiation unit 20 in the direction away from the first radiation unit 10.

[0035] In practical use, when one of the first radiating units 10 is operating, the second radiating unit 20, which is closer to the first radiating unit 10, exhibits inductive impedance in the first frequency band. This weakens the radiation from the first radiating unit 10 towards the second radiating unit 20, thereby preventing direct coupling between the first radiating unit 10 and the second radiating unit 10, reducing the radiation overlap between the two first radiating units 10, and effectively improving the co-frequency isolation between the two first radiating units 10. When one of the second radiating units 20 is operating, the first radiating unit 10, which is closer to the second radiating unit 20, exhibits capacitive impedance in the second frequency band. This weakens the radiation from the second radiating unit 20 towards the other second radiating unit 20, thereby reducing mutual interference between the radiation fields of the two second radiating units 20 and improving the co-frequency isolation between the two second radiating units 20.

[0036] Therefore, by setting a distribution structure with high frequency on the outside and low frequency on the inside, and controlling the spacing between the first radiation unit 10 and the second radiation unit 20 to be one-quarter of the wavelength of the second radiation unit 20, the radiation coupling between radiation units of the same frequency is effectively reduced.

[0037] With the development of communication technology, wireless network cards are required to cover dual-band operating frequencies simultaneously, such as both 2G and 5G. To meet this requirement, related technologies use two radiating elements for each of the two different frequency bands, and then set up a decoupling structure between the radiating elements to maintain good isolation within the same frequency band.

[0038] However, decoupling structures occupy more space, increasing the overall size of the antenna and reducing its versatility and competitiveness. Maintaining frequency isolation between radiating elements within the same frequency band while keeping the antenna compact is a problem that the industry urgently needs to solve.

[0039] In addition, related technologies can also employ dual-band single-feed antennas, where two radiating elements of different frequency bands work together with a duplexer to achieve outputs in different frequency bands. Although the duplexer can maintain good isolation between the two output ports of different frequencies, it introduces additional insertion loss, degrading the antenna gain performance.

[0040] This application, by setting a high-frequency distribution structure on the outside and a low-frequency distribution on the inside, and controlling the spacing between the first radiating element 10 and the second radiating element 20 to one-quarter of the wavelength of the second radiating element 20, enables directional radiation characteristics between each radiating element. When the antenna operates in different frequency bands, it can dynamically realize the function of the first radiating element 10 as a director and the function of the second radiating element 20 as a reflector, thus directionally constraining the radiation and improving the co-frequency isolation between the two first radiating elements 10 and the two second radiating elements 20. Furthermore, since the first radiating element 10 and the second radiating element 20 themselves are used to improve the co-frequency isolation without the need for additional decoupling structures, the space occupied is smaller, which is beneficial for antenna miniaturization and a wider range of applications.

[0041] To further improve the co-frequency isolation between the two second radiating elements 20, in some embodiments, see below. Figure 1 , Figures 3 to 5 The antenna also includes a parasitic element 30, the resonant frequency of which is tuned to the second frequency band. The parasitic element 30 is disposed between two second radiating elements 20 to absorb near-field coupling energy between the two second radiating elements 20.

[0042] Thus, the parasitic element 30 generates an induced current under the radiation of the second radiation unit 20, thereby generating parasitic radiation. By adjusting the size of the parasitic element 30 to tune its resonant frequency to the second frequency band, the parasitic radiation generated by the parasitic element 30 can decouple the radiation of the second radiation unit 20, thereby further improving the isolation between the two second radiation units 20.

[0043] In some embodiments, such as Figure 1 , Figure 2 and Figure 5 As shown, the antenna also includes a circuit board 40. The first radiating element 10, the second radiating element 20 and the parasitic element 30 are disposed on one side of the circuit board 40. In order to ensure that the size of the parasitic element 30 meets the radiation requirements of decoupling the second radiating element 20, the length of the parasitic element 30 is generally relatively long. However, in order to achieve the miniaturization design of the antenna, the long parasitic element 30 needs to be placed on the circuit board 40 with limited size. By bending the parasitic element 30, the parasitic element 30 can make full use of the space on the circuit board 40.

[0044] Specifically, the parasitic component 30 has a first parasitic portion 31 located between two second radiating units 20 and second parasitic portions 32 respectively disposed on both sides of the first parasitic portion 31. The two second parasitic portions 32 extend in opposite directions. On the same projection plane parallel to the circuit board 40, the parasitic component 30 bends so that its own projection is located within the projection of the circuit board 40.

[0045] The first parasitic part 31 is located in the middle of the two second radiation units 20. The extension direction of the first parasitic part 31 is parallel to the extension direction of the second main body. The second parasitic parts 32 are respectively disposed on both sides of the first parasitic part 31 facing the second radiation unit 20 and avoiding the first radiation unit 10 and the second radiation unit 20. Under the radiation of the second radiation unit 20, the parasitic member 30 generates parasitic radiation that can weaken the radiation of the second radiation unit 20.

[0046] In one embodiment, two second parasitic portions 32 are located at the ends of the first parasitic portion 31 away from the first radiating unit 10. The extension direction of the second parasitic portion 32 is perpendicular to the extension direction of the first parasitic portion 31, and the second parasitic portion 32 itself is not bent, so that the parasitic member 30 is T-shaped.

[0047] In another embodiment, the second parasitic portion 32 bends relative to itself at least once. When the second parasitic portion 32 bends multiple times, it can bend into a snake shape, a zigzag shape, or the like. For example, the second parasitic portion 32 bends itself to make the parasitic member 30 into an umbrella shape.

[0048] In some embodiments, continue reading Figure 1 , Figures 3 to 5With the extension direction of the first parasitic part 31 as the axis of symmetry, two first radiation units 10 are symmetrically arranged, two second radiation units 20 are symmetrically arranged, and two second parasitic parts 32 are symmetrically arranged.

[0049] To ensure that the operation of the first radiation unit 10 does not affect the operation of the second radiation unit 20, and that the operation of the second radiation unit 20 does not affect the operation of the first radiation unit 10, a structure capable of improving inter-frequency isolation is also required. In some embodiments, such as... Figures 2 to 4 As shown, the antenna also includes a circuit board 40 and an electromagnetic balance network 50. The first radiating element 10 and the second radiating element 20 are disposed on one side of the circuit board 40, and the electromagnetic balance network 50 is disposed on the other side of the circuit board 40. The electromagnetic balance network 50 is used to suppress the coupling between the first radiating element 10 and the second radiating element 20.

[0050] Specifically, the circuit board 40 has a first metallized via 61 and a second metallized via 62 that penetrate through it, and the two ends of the electromagnetic balancing network 50 are respectively connected to the first metallized via 61 and the second metallized via 62. There are two electromagnetic balancing networks 50, and each electromagnetic balancing network 50 is connected to the adjacent first radiating unit 10 and second radiating unit 20.

[0051] When coupling occurs between the first radiation unit 10 and the second radiation unit 20, the electromagnetic balance network 50 introduces a negative feedback path to generate a reverse magnetic field in real time, which forms destructive interference with the original coupling path, thereby improving the inter-frequency isolation.

[0052] like Figure 3 and Figure 4 In the embodiment shown, the first metallized via 61 faces the first branch 13 of the first radiating unit 10 and is connected to the first branch 13, and the second metallized via 62 faces the second main body of the second radiating unit 20 and is connected to the second main body.

[0053] Therefore, an electromagnetic balancing network 50 is introduced between the first radiating unit 10 and the second radiating unit 20. By constructing a multi-path electromagnetic feedback loop, the energy of the original coupling path between the first radiating unit 10 and the second radiating unit 20 is dynamically canceled, thereby achieving cross-frequency coupling suppression. Furthermore, the electromagnetic balancing network 50 is located on the side of the circuit board 40 away from the first radiating unit, thus making full use of the surface space on both sides of the circuit board without increasing the circuit board area.

[0054] In some embodiments, such as Figures 2 to 4As shown, the antenna also includes a circuit board 40 and a grounding element 70. The first radiating element 10 and the second radiating element 20 are disposed on one side of the circuit board 40, and the grounding element 70 is disposed on the other side of the circuit board 40 and contacts the ground 80. The length of the grounding element 70 is greater than the distance between the two second radiating elements 20, and the projection of the grounding element 70 and the projection of the second radiating element 20 coincide on the same projection plane parallel to the circuit board 40.

[0055] The grounding element 70 is sheet-shaped and covers the side of the circuit board 40 away from the first radiating unit 10. In the extending direction of the grounding element 70, the two side edges of the grounding element 70 extend beyond the first radiating unit 10 and are located between the first radiating unit 10 and the second radiating unit 20. In other words, on the same projection plane parallel to the circuit board 40, the projection of the grounding element 70 coincides with the projection of the second radiating unit 20.

[0056] Because a grounding element 70 is provided on the side of the circuit board 40 away from the first radiating unit 10, the grounding element 70 can suppress surface waves and reduce the parasitic coupling effect between adjacent radiating units. Since the length of the grounding element 70 is set to be greater than the distance between the two second radiating units 20, making the grounding element 70 relatively large, the grounding element 70 can effectively suppress edge radiation loss, guide electromagnetic energy to transmit efficiently along the expected path, and further reduce the parasitic coupling effect between adjacent radiating units. That is, it suppresses the coupling between the first radiating unit 10 and the second radiating unit 20, improves cross-band isolation, and reduces the risk of inter-frequency interference.

[0057] In a specific embodiment, such as Figures 1 to 3 As shown, the circuit board 40 uses FR (flame-resistant) 4 standard board material, which has a top layer and a bottom layer. The top layer contains two 2G radiating units, two 5G radiating units, and a parasitic element 30. The two 2G radiating units are located between the two 5G radiating units. The 2G radiating units are shaped like an inverted "mountain," and the 5G radiating units are shaped like an "h." The parasitic element 30 has a first parasitic portion 31 located between the two 2G radiating units and a second parasitic portion 32 that bends relative to the first parasitic portion 31 and itself, making the parasitic element 30 shaped like an "umbrella." The bottom layer contains two electromagnetic balancing networks 50 and a grounding element 70. Each electromagnetic balancing network 50 connects to adjacent 2G and 5G radiating units, and the length of the grounding element 70 is greater than the distance between the two second radiating units 20.

[0058] This application has tested the co-frequency isolation of the antennas in the above embodiments, such as... Figure 6 and Figure 7 As shown. Figure 6In the figure, S1,1 represents the relationship between the reflection coefficient of one 5G radiating element and the frequency, S4,4 represents the relationship between the reflection coefficient of another 5G radiating element and the frequency, and S4,1 represents the co-frequency isolation between the two 5G radiating elements. It can be seen that the reflection coefficient of the 5G antenna in the 5.15-5.85GHz band is less than -12dB, and the co-frequency isolation reaches 15.6dB. Figure 7 In the diagram, S2,2 represents the relationship between the reflection coefficient of one 2G radiating element and the frequency, S3,3 represents the relationship between the reflection coefficient of another 2G radiating element and the frequency, and S3,2 represents the co-frequency isolation between the two 2G radiating elements. It can be seen that the reflection coefficient of the 2G antenna in the 2.4-2.5GHz frequency band is less than -11dB, and the co-frequency isolation reaches 13dB.

[0059] This application also tested the inter-frequency isolation of the antennas in the above embodiments, such as... Figure 8 As shown. Figure 8 In the diagram, S2,1 represents the inter-frequency isolation between adjacent 5G and 2G radiating units located on the left side of the first parasitic part 31; S3,1 represents the inter-frequency isolation between the 5G radiating unit located on the left side of the first parasitic part 31 and the 2G radiating unit located on the right side of the first parasitic part 31; S2,4 represents the inter-frequency isolation between the 2G radiating unit located on the left side of the first parasitic part 31 and the 5G radiating unit located on the right side of the first parasitic part 31; and S3,4 represents the inter-frequency isolation between the 5G radiating unit and the 2G radiating unit located on the right side of the first parasitic part 31. It can be seen that the inter-frequency isolation between the 2G and 5G radiating units reaches 22 dB.

[0060] This application also tested the radiation efficiency of the antenna in the above embodiments, such as... Figure 9 As shown. From Figure 9 As can be seen from the results, the antenna in this application has a simulated radiation efficiency of more than 81% in the 2.4-2.5GHz range and a simulated radiation efficiency of more than 93% in the 5.15-5.85GHz range, and the radiation efficiency changes little with frequency.

[0061] This application also detected the current distribution of the parasitic element 30 when the 2G radiating unit is working in the above embodiments, such as... Figure 10 As shown. From Figure 10 As can be seen, when the 2G radiation unit located to the left of the first parasitic part 31 is working, the parasitic element 30 absorbs the parasitic coupling energy between the 2G radiation units through parasitic resonance. The electromagnetic energy is preferentially concentrated in the direction of the second parasitic part 32, rather than propagating freely between adjacent 2G radiation units. Basically no energy is coupled to the 2G radiation unit located to the right of the first parasitic part 31.

[0062] Secondly, this application also provides a communication device including the antenna described in the first aspect.

[0063] The antenna can be configured as Figures 1 to 4 The 2×2 MIMO (Multiple Input Multiple Output) specification shown can also be configured as follows: Figure 5 The 4×4 MIMO specification is shown.

[0064] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, and improvements made within the spirit and scope of this application are included within the scope of protection of this application.

Claims

1. An antenna, characterized in that, include: The first radiating element operates in the first frequency band, and two first radiating elements are arranged at intervals. The second radiating element operates in the second frequency band. Two second radiating elements are spaced apart and located between two first radiating elements. The distance between the first radiating elements and the second radiating elements is less than or equal to one-quarter of the wavelength of the second radiating element. Wherein, the frequency of the first frequency band is greater than the frequency of the second frequency band; when one of the first radiation units is working, the second radiation unit adjacent to the first radiation unit in the working state exhibits inductive impedance in the first frequency band and acts as a reflector, weakening the radiation of the first radiation unit in the working state toward another first radiation unit. When one of the second radiation units is in operation, the first radiation unit adjacent to the second radiation unit in operation acts as a director with capacitive impedance in the second frequency band, thereby reducing the radiation from the second radiation unit in operation toward another second radiation unit.

2. The antenna according to claim 1, characterized in that, The size of the first radiating element is smaller than that of the second radiating element, and the first feed port of the first radiating element and the second feed port of the second radiating element both face the same side.

3. The antenna according to claim 1, characterized in that, It also includes a parasitic element whose resonant frequency is tuned to the second frequency band, and the parasitic element is disposed between two second radiating units to absorb near-field coupling energy between the two second radiating units.

4. The antenna according to claim 3, characterized in that, It also includes a circuit board, wherein the first radiating unit, the second radiating unit and the parasitic member are disposed on one side of the circuit board, the parasitic member has a first parasitic part located between the two second radiating units and a second parasitic part respectively disposed on both sides of the first parasitic part, the two second parasitic parts extend in opposite directions, and on the same projection plane parallel to the circuit board, the parasitic member is bent so that its own projection is located within the projection of the circuit board.

5. The antenna according to claim 4, characterized in that, With the extension direction of the first parasitic part as the axis of symmetry, two first radiation units are symmetrically arranged, two second radiation units are symmetrically arranged, and two second parasitic parts are symmetrically arranged.

6. The antenna according to any one of claims 1 to 5, characterized in that, It also includes a circuit board and an electromagnetic balancing network. The first radiation unit and the second radiation unit are disposed on one side of the circuit board, and the electromagnetic balancing network is disposed on the other side of the circuit board. The electromagnetic balancing network is used to suppress the coupling between the first radiation unit and the second radiation unit.

7. The antenna according to claim 6, characterized in that, The circuit board has a first metallized via and a second metallized via that pass through it, and the two ends of the electromagnetic balance network are respectively connected to the first metallized via and the second metallized via.

8. The antenna according to any one of claims 1 to 5, characterized in that, It also includes a circuit board and a grounding component. The first radiating unit and the second radiating unit are disposed on one side of the circuit board, and the grounding component is disposed on the other side of the circuit board and in contact with the ground. The length of the grounding component is greater than the distance between the two second radiating units, and the projection of the grounding component and the projection of the second radiating unit coincide on the same projection plane parallel to the circuit board.

9. The antenna according to any one of claims 1 to 5, characterized in that, The first radiating element includes a first body portion and a first branch portion connected to each other, the first branch portion being located on one side of the first body portion; and / or, The second radiation unit includes a second body part and two second branches connected to each other. The two second branches are located on both sides of the second body part and are arranged symmetrically.

10. A communication device, characterized in that, include: The antenna according to any one of claims 1 to 9.

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