Antenna and wireless device

Abstract

The invention relates to the technical field of communication, and discloses an antenna and wireless equipment. The antenna comprises an antenna oscillator and a parasitic unit. Wherein the parasitic unit is asymmetric relative to the phase center of the antenna oscillator, so that when the antenna oscillator works in a first frequency band, parasitic current can be generated in the parasitic unit, and the first frequency band is a frequency band except the working frequency band of the antenna oscillator. The parasitic unit can generate wave beams concentrated towards a first direction under the action of parasitic current, and the first direction is the polarization direction of the antenna oscillator. According to the antenna provided by the invention, the beam width of radiation of the antenna in the first frequency band is reduced by reasonably designing the parasitic unit, so that the beam of radiation of the antenna in the first frequency band is a directional narrow beam, coupling of the antenna in the first frequency band is effectively reduced, and the isolation degree is improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an antenna and a wireless device. Background Art

[0002] With the rapid development of wireless communication technology, the frequency bands used in the field of wireless local area network (WLAN) are increasing, and the demand for capacity is also increasing. Therefore, the number of antennas in access point (AP) devices is increasing. However, the size of the access point is limited, so the interval between each antenna will be further reduced, the mutual coupling between each antenna will be strengthened, and the isolation will be deteriorated. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides an antenna and a wireless device, which can effectively improve the isolation of the antenna by adding a parasitic unit in the antenna.

[0004] In a first aspect, the present application provides an antenna, comprising an antenna element and a parasitic unit. The parasitic unit is asymmetric with respect to the phase center of the antenna element, so that when the antenna element operates in a first frequency band, a parasitic current can be generated in the parasitic unit, and the first frequency band is a frequency band outside the operating frequency band of the antenna element. Under the action of the parasitic current, the parasitic unit can generate a beam concentrated in a first direction, and the first direction is the polarization direction of the antenna element.

[0005] According to the implementation mode of the present application, when the antenna vibrator operates in the first frequency band, a parasitic current can be generated in the parasitic unit. Under the action of the parasitic current, the parasitic unit can generate a beam concentrated in the first direction, so that the beam radiated by the antenna in the first frequency band is concentrated in the first direction, effectively reducing the beam width radiated by the antenna in the first frequency band, so that the beam radiated by the antenna in the first frequency band is a directional narrow beam, and the beam radiated in the working frequency band is an omnidirectional wide beam, while ensuring the working performance of the antenna, effectively improving the isolation of the antenna in the first frequency band.

[0006] In a possible implementation of the first aspect, the parasitic unit includes a dipole unit.

[0007] According to the implementation mode of the present application, when the antenna element operates in the first frequency band, the parasitic unit can be excited to form a dipole radiation pattern, so that the parasitic unit can generate a directional beam concentrated in the first direction, thereby improving the isolation between the antenna and other antennas in the first frequency band.

[0008] In a possible implementation of the first aspect, the dipole unit includes a first straight line segment extending along the second direction, the angle between the second direction and the first direction is 45° to 90°, and the first straight line segment is asymmetrically arranged relative to the phase center of the antenna element.

[0009] According to the implementation mode of the present application, when the antenna element operates in the first frequency band, a parasitic current flowing in the second direction can be generated in the first straight line segment. Under the action of the parasitic current, the first straight line segment can generate a directional beam concentrated in the first direction, thereby improving the isolation between the antenna and other antennas in the first frequency band.

[0010] In a possible implementation of the first aspect, the dipole unit further includes a bending segment, and along the second direction, the bending segment is disposed on one side of the first straight segment and connected to the first straight segment.

[0011] In this way, it can be ensured that the dipole unit has a certain length so as to be able to work within the first frequency band. At the same time, the size of the dipole unit along the second direction can be further reduced to improve the compactness of the structure.

[0012] In a possible implementation of the first aspect, the first straight line segment is disposed on a first side of a phase center of the antenna element, and the bent segment is disposed on a second side of the phase center of the antenna element.

[0013] Based on this, it is possible to ensure that the parasitic current in the first straight line segment has a certain strength, and at the same time, the first straight line segment and the bending segment of the dipole unit can be reused with the antenna element in the second direction, thereby effectively avoiding the dipole unit from occupying too much extra area and further improving the space utilization.

[0014] In a possible implementation of the first aspect, along the second direction, a projection of the bending segment at least partially overlaps with a projection of the antenna element.

[0015] Based on this, the bending section can achieve size reuse with the antenna element in the first direction, thereby ensuring that the bending section has a certain length while effectively avoiding the bending section from occupying too much area, further improving space utilization.

[0016] In a possible implementation of the first aspect, the bending section includes one or more U-shaped structures or V-shaped structures.

[0017] In a possible implementation of the first aspect, the dipole unit also includes a second straight line segment extending along a second direction, wherein the second straight line segment is arranged on a side of the bending segment away from the first straight line segment along the second direction, and is connected to the first straight line segment through the bending segment, and the length of the second straight line segment is less than the length of the first straight line segment.

[0018] According to the implementation mode of the present application, the second straight line segment can further increase the length of the dipole unit, thereby meeting the working requirements in various application scenarios. At the same time, the second straight line segment and the bending segment are respectively arranged on both sides of the phase center of the antenna vibrator with the first straight line segment, so as to avoid the dipole unit from being too offset relative to the antenna vibrator along the second direction, thereby improving the balance and aesthetics of the layout.

[0019] In a possible implementation of the first aspect, a ratio of a length of the first straight line segment to a length of the second straight line segment is greater than 2. For example, 3, 4, 5, etc. This ensures that a sufficiently strong parasitic current can be generated in the dipole unit, thereby increasing the intensity of a directional beam generated by the dipole unit and concentrated in the first direction, thereby further increasing the isolation between the antenna and other antennas in the first frequency band.

[0020] In a possible implementation of the first aspect, the length of the dipole unit is λ / 4 to 3λ / 4, where λ is the wavelength of the signal at the center frequency of the first frequency band, thereby further improving the working performance of the dipole unit 210 in the first frequency band.

[0021] In a possible implementation of the first aspect, the length of the bending section is λ / 8 to λ / 4, where λ is the wavelength of the signal at the center frequency of the first frequency band. This ensures that the bending section has a certain length so as to reduce the size occupied by the dipole unit along the second direction. At the same time, the problem that the dipole unit cannot work normally due to the bending section being too long can also be avoided.

[0022] In a possible implementation of the first aspect, the antenna includes a ground plane, the plane where the ground plane is located is perpendicular to the first direction, and along the first direction, the antenna element and the parasitic unit are located on the same side of the ground plane, and the distance between the first straight line segment and the ground plane is λ / 8 to 3λ / 8, where λ is the wavelength of the signal at the center frequency of the first frequency band, thereby further improving the radiation effect of the first straight line segment.

[0023] In a possible implementation of the first aspect, the antenna element includes a monopole antenna element, a planar inverted-F antenna element, or a dipole antenna element.

[0024] In a possible implementation of the first aspect, the antenna further includes a substrate, and the antenna and the parasitic unit are disposed on the substrate.

[0025] In a second aspect, the present application provides a wireless device, which includes a housing, and the first aspect and any one of the antennas in the possible implementations of the first aspect, wherein the antenna is disposed on the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 An exemplary application scenario of an embodiment of the present application is shown;

[0027] Figure 2 A schematic diagram of the structure of the antenna in an embodiment of the present application is shown;

[0028] Figure 3 A schematic diagram showing a parasitic current generated in a parasitic unit in an embodiment of the present application is shown;

[0029] Figure 4A The radiation pattern of the antenna in the working frequency band in the embodiment of the present application is shown;

[0030] Figure 4B The radiation pattern of the antenna in the first frequency band in an embodiment of the present application is shown;

[0031] Figure 5A An exemplary working scenario of the antenna in the embodiment of the present application is shown;

[0032] Figure 5B It shows that the antenna in the embodiment of the present application works Figure 5A A schematic diagram of the isolation within the first frequency band in the scenario shown;

[0033] Fig. 6A The structure of the antenna element in the embodiment of the present application is shown in FIG. Figure 1 ;

[0034] Figure 6B The structure of the antenna element in the embodiment of the present application is shown in FIG. Figure 2 ;

[0035] Figure 6C The structure of the antenna element in the embodiment of the present application is shown in FIG. Figure 3 ;

[0036] Figure 7 A schematic diagram of the structure of a parasitic unit in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0038] It should be understood that the "multiple" mentioned in this application refers to two or more. In the description of this application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in order to facilitate the clear description of the technical solution of this application, the words "first" and "second" are used to distinguish between the same items or similar items with basically the same functions and effects. Those skilled in the art can understand that the words "first" and "second" do not limit the quantity and execution order, and the words "first" and "second" do not limit them to be different.

[0039] To facilitate understanding of the technical solution of the present application, some concepts or terms involved in the present application are first explained.

[0040] (1) Antenna isolation

[0041] When one antenna (denoted as antenna A) transmits a signal, the ratio of the strength of the signal received by another antenna (denoted as antenna B) to the strength of the signal transmitted by antenna A is the isolation. Antenna isolation can be expressed by the absolute value of the antenna's S21 parameter, in decibels (dB), and the S21 parameter is usually a negative value. The larger the absolute value of the S21 parameter, the greater the isolation between antennas and the smaller the interference between antennas; the smaller the absolute value of the S21 parameter, the smaller the isolation between antennas and the greater the interference between antennas.

[0042] (2) Antenna phase center

[0043] When the electromagnetic wave radiated by the antenna leaves the antenna at a certain distance, its isophase surface will be approximately a sphere, and the center of the sphere is the equivalent phase center of the antenna. In other words, in theory, the signal radiated by the antenna is radiated outward with the phase center as the center of the circle.

[0044] The implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0045] The embodiments of the present application are used to provide an antenna and a wireless device including the antenna. Among them, the wireless device provided in the present application may include but is not limited to access point devices, mobile phones, tablet computers, laptop computers, wireless headphones (for example, true wireless stereo (TWS) headphones, etc.), wearable devices (such as smart watches, smart bracelets, smart helmets, smart glasses, smart jewelry, etc.), augmented reality (AR) / virtual reality (VR) devices, personal communication service (PCS) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs) or base stations, etc. Any wireless device with wireless communication functions, and the present application does not specifically limit this.

[0046] It can be understood that the above-mentioned wireless devices can be used in various communication systems, such as fifth generation (5G) mobile communication system, sixth generation (6G) communication system, global system for mobile communications (GSM), code division multiple access (CDMA) system, time division multiple access (TDMA) system, wideband code division multiple access (WCDMA) wireless, frequency division multiple addressing (FDMA) system, orthogonal frequency-division multiple access (OFDMA) system or long term evolution (LTE) system, etc.

[0047] For ease of description, the technical solution of the present application is introduced below by taking the wireless device being an access point device as an example.

[0048] Figure 1 An exemplary application scenario of the embodiment of the present application is shown. Figure 1, the lower left is the access point device 1, and the upper right is the terminal 2 located far from the access point device 1. The access point device 1 includes an antenna 10, an antenna 11, and a housing 12. The antenna 10 and the antenna 11 are both arranged in the housing 12, wherein the antenna 10 and the antenna 11 are shown in dotted lines for easy observation. The terminal 2 includes an antenna 20. The antenna 10 and the antenna 11 can transmit and receive signals with the antenna 20 respectively, so that the access point device 1 and the terminal 2 can communicate with each other.

[0049] At present, as the frequency bands used in the field of wireless local area networks gradually increase, the number of antennas required in access point devices also gradually increases. However, due to the size limitations of the access point device, the more antennas there are, the smaller the spacing between the antennas will be. At this time, the isolation between the antennas will be worse, which will lead to poor channel capacity. Especially when the antenna in the access point device is an omnidirectional antenna with a wide beam width (for example, a monopole antenna or a planar inverted F-shaped antenna (PIFA)), or the operating frequency bands of each antenna are relatively close (for example, the 5G band (5150~5850MHz) or the 6G (5925~7125MHz) band), it is easier for the antennas to produce mutual coupling, and the isolation design is more difficult.

[0050] In order to solve the problem of poor antenna isolation mentioned above, the present application provides an antenna, which includes a parasitic unit. By reasonably designing the parasitic unit, the beam width radiated by the antenna in the first frequency band (i.e., the frequency band that the antenna needs to be isolated) can be effectively reduced, so that the beam radiated by the antenna in the first frequency band is a directional narrow beam, thereby effectively reducing the degree of coupling between the antenna and other antennas in the first frequency band and improving the isolation. The technical solution of the present application is described in detail below in conjunction with the accompanying drawings.

[0051] Figure 2 FIG. 1 is a schematic diagram showing the structure of the antenna 10 in an embodiment of the present application. Figure 2 The antenna 10 includes an antenna element 100 , a parasitic unit 200 , a substrate 300 and a ground plane 400 .

[0052] Exemplarily, the antenna element 100 and the parasitic unit 200 may be disposed on the same side or opposite sides of a substrate 300 (e.g., a printed circuit board (PCB)), and located on the same side of a ground plane 400. The plane where the ground plane 400 is located may be perpendicular to the Z direction (as an example of a first direction).

[0053] The parasitic unit 200 is located at the phase center of the antenna element 100 (eg Figure 2The antenna element 100 is asymmetrically arranged as shown by point P in the figure, so that when the antenna element 100 operates in the first frequency band, a parasitic current can be generated in the parasitic unit 200. The first frequency band is a frequency band outside the operating frequency band of the antenna 10. It can also be understood that the first frequency band is a frequency band in which the antenna 10 needs to improve isolation.

[0054] For example, Figure 3 FIG. 2 is a schematic diagram showing a parasitic current generated in the parasitic unit 200 in an embodiment of the present application. Figure 3 , when the antenna element 100 operates in the first frequency band, a parasitic current I may be generated in the parasitic unit 200. Figure 3 The solid arrow in the figure shows an exemplary flow direction of the current I. Under the action of the parasitic current I, the parasitic unit 200 can generate a directional beam concentrated in the Z direction, so that the beam radiated by the antenna 10 in the first frequency band is concentrated in the Z direction, thereby improving the isolation between the antenna 10 and other antennas in the first frequency band. The Z direction is the polarization direction of the antenna element.

[0055] Specifically, Figure 4A The radiation pattern of the antenna 10 in the working frequency band in the embodiment of the present application is shown. Figure 4B The radiation pattern of the antenna 10 in the first frequency band in the embodiment of the present application is shown. It should be noted that: Figure 4A and Figure 4B The description is made by taking the first frequency band as the 5G frequency band (5150 MHz to 5850 MHz) and the working frequency band of the antenna 10 as the 6G frequency band (5925 MHz to 7125 MHz) as an example.

[0056] refer to Figure 4A Combined with Figure 2 When the antenna 10 operates in the working frequency band, the antenna element 100 will not couple with the parasitic unit 200, that is, the parasitic unit 100 will not radiate electromagnetic waves. Therefore, the energy received by the antenna 10 is converted into electromagnetic waves by the antenna element 100 and radiated out. As a result, the beam radiated by the antenna 10 is an omnidirectional wide beam, similar to an apple shape.

[0057] refer to Figure 4B Combined with Figure 3When the antenna 10 operates in the first frequency band, the antenna 10 generates a parasitic current I in the parasitic unit 200. Part of the energy received by the antenna 10 is converted into electromagnetic waves by the antenna element 100 and radiated out, and the other part is converted into electromagnetic waves by the parasitic unit 200 and radiated out. Under the action of the parasitic current I, the parasitic unit 200 generates a directional beam concentrated along the Z direction. Therefore, the radiation intensity of the antenna 10 in the direction perpendicular to the Z direction is weakened, and the radiation intensity in the Z direction is strengthened. The final radiated beam is a narrow beam concentrated in the Z direction, which can effectively improve the isolation between the antenna 10 and other antennas in the first frequency band.

[0058] To facilitate understanding of the effect of the antenna 10 on improving isolation, a description is given below in conjunction with a working scenario of the antenna 10 and a schematic diagram of isolation working in the first frequency band.

[0059] For example, Figure 5A An exemplary working scenario of the antenna 10 in the embodiment of the present application is shown. Figure 5B It shows that the antenna 10 in the embodiment of the present application works Figure 5A Schematic diagram of the isolation within the first frequency band in the scenario shown. It should be noted that, Figure 5A and Figure 5B The description is made by taking the first frequency band and the working frequency band of the antenna 11 as the 5G frequency band, and the working frequency band of the antenna 10 as the 6G frequency band as an example.

[0060] Combination Figure 5A and Figure 5B , antenna 10 and antenna 11 are spaced apart along the Y direction. Exemplarily, the Y direction is perpendicular to the Z direction. According to the above, since the parasitic unit 200 causes the beam radiated by antenna 10 in the first frequency band to be a narrow beam concentrated in the Z direction, the signal intensity of the first frequency band transmitted by antenna 10 and received by antenna 11 can be effectively reduced, and the coupling between antenna 10 and antenna 11 in the first frequency band will be weakened, thereby effectively reducing the interference between antenna 10 and antenna 11, and the isolation between antenna 10 and antenna 11 in the 5G frequency band can be improved by 4dB on average.

[0061] In summary, the above antenna 10, through the reasonable design of the parasitic unit 200, makes the beam radiated by the antenna 10 in the first frequency band a directional narrow beam, and the beam radiated in the working frequency band an omnidirectional wide beam, thereby ensuring the working performance of the antenna 10 while effectively improving the isolation between the antenna 10 and other antennas in the first frequency band. In addition, compared with the solution of improving isolation by adding a filtering circuit to the feeder or antenna and adding a decoupling structure between antennas, the present application improves isolation by using the parasitic unit 200 without introducing additional insertion loss, and the cost is low, and the effect of improving isolation is better.

[0062] The specific structures of the antenna element 100 and the parasitic unit 200 in the antenna 10 will be described in detail below with reference to the accompanying drawings.

[0063] In some embodiments of the present application, the antenna element 100 may have a variety of structural forms. For example, FIG. 6A to FIG. 6C The schematic diagrams of the structures of several antenna elements 100 in the embodiments of the present application are shown. Fig. 6A As shown, the antenna element 100 may be a monopole antenna element placed perpendicular to the ground plane 400. Figure 6B As shown, the antenna element 100 may also be a dipole antenna element placed perpendicular to the ground plane 400. Figure 6C As shown, the antenna element 100 may also be a planar inverted-F antenna element placed perpendicular to the ground plane 400 .

[0064] It can be understood that the present application does not impose any specific restrictions on the structural form of the antenna element 100, and any structural form of the antenna element 100 that can achieve the above-mentioned radiation effect is within the protection scope of the present application.

[0065] Figure 7 FIG. 2 shows a schematic diagram of the structure of the parasitic unit 200 in the embodiment of the present application. It should be noted that, for the convenience of observation, Figure 7 The antenna element 100 is shown in dashed lines. Figure 7 In some embodiments of the present application, the parasitic unit 200 may include a dipole unit 210. That is, when the antenna element 100 operates in the first frequency band, the parasitic unit 200 may be excited to form a dipole radiation pattern, so that the parasitic unit 200 can generate a directional beam concentrated in the Z direction, thereby improving the isolation between the antenna 10 and other antennas in the first frequency band.

[0066] Continue reading Figure 7 In some embodiments of the present application, the dipole unit 210 may include a first straight line segment 211 extending along the X direction (as an example of the second direction). The angle between the X direction and the Z direction is 45° to 90°, for example, 45°, 60°, 70°, 80° or 90°. Moreover, the first straight line segment 211 is asymmetrically arranged relative to the phase center P of the antenna element 100. In this way, when the antenna element 100 operates in the first frequency band, a parasitic current I1 flowing along the X direction may be generated in the first straight line segment 211. Under the action of the parasitic current I1, the first straight line segment 211 can generate a directional beam concentrated in the Z direction, thereby improving the isolation between the antenna 10 and other antennas in the first frequency band.

[0067] For example, Figure 7As shown, in this embodiment, the first straight segment 211 is arranged on the first side 101 of the phase center P of the antenna element 100 to ensure that the parasitic current I1 in the first straight segment 211 has a certain strength, so that the first straight segment 211 can generate a strong directional beam concentrated in the Z direction. Alternatively, in other embodiments, a part of the first straight segment 211 can be arranged on the first side 101 of the phase center P of the antenna element 100, and another part of the first extension end 211 is arranged on the second side 102 of the phase center P of the antenna element 100, and the length of the part of the first straight segment 211 located on the first side 101 is different from the length of the part of the first straight segment 211 located on the second side 102.

[0068] Continue reading Figure 7 In some embodiments of the present application, the dipole unit 210 may further include a bent section 212. Along the X direction, the bent section 212 is located on one side of the first straight section 211 and is connected to the first straight section 211. In this way, it can be ensured that the dipole unit 210 has a certain length so as to be able to work within the first frequency band. At the same time, the size of the dipole unit 210 along the X direction can be further reduced to improve the compactness of the structure. Among them, the length of the dipole unit 210 refers to the length of the extension track from one end of the dipole unit 210 to the other end of the dipole unit 210.

[0069] For example, the bending section 212 may include one or more U-shaped structures or V-shaped structures. Figure 7 As shown, the bending section 212 may include a U-shaped structure 2120. The U-shaped structure 2120 includes a first portion 2121, a second portion 2122, and a third portion 2123 connected in sequence. The first portion 2121 and the third portion 2123 are straight line segments extending along the Z direction, and the second portion 2122 is a straight line segment extending along the X direction. In other alternative embodiments, the U-shaped structure 2120 may also include an arc segment, which is not limited in the present application.

[0070] In some embodiments of the present application, along the X direction, the first straight segment 211 may be located at the first side 101 of the phase center P of the antenna element 100. The bent segment 212 may be located at the second side 102 of the phase center of the antenna element 100. In this way, it is possible to ensure that the parasitic current I1 in the first straight segment 211 has a certain intensity. At the same time, the first straight segment 211 and the bent segment 212 of the dipole unit 210 can also be reused with the antenna element 100 in the X direction, thereby effectively avoiding the dipole unit 210 from occupying too much extra area, further improving the space utilization.

[0071] In some embodiments of the present application, along the X direction, the projection of the bending section 212 at least partially overlaps with the projection of the antenna element 100. In this way, the bending section 212 can realize dimension reuse in the Z direction with the antenna element 100, thereby ensuring that the bending section 212 has a certain length while effectively avoiding the bending section 212 from occupying too much area, further improving the space utilization. The length of the bending section 212 refers to the length of the extension track from one end of the bending section 212 to the other end of the bending section 212.

[0072] In some embodiments of the present application, the dipole unit 210 may further include a second straight segment 213 extending along the X direction. Along the X direction, the second straight segment 213 is disposed on a side of the bending segment 212 away from the first straight segment 211, and is connected to the first straight segment 211 through the bending segment 212. Figure 7 As shown, the first straight segment 211 is located at the first side 101 of the phase center P of the antenna element 100. The second straight segment 213 and the bending segment 212 are located at the second side 102 of the phase center of the antenna element 100. The length of the second straight segment 213 is less than that of the first straight segment 211.

[0073] The second straight line segment 213 can further increase the length of the dipole unit 210, thereby meeting the working requirements in various application scenarios. At the same time, the second straight line segment 213 and the bending segment 212 are respectively arranged on both sides of the phase center P of the antenna vibrator 100 with the first straight line segment 211, which can avoid the excessive offset of the dipole unit 210 relative to the antenna vibrator 100 along the X direction, and reduce the difference between the area occupied by the dipole unit 210 on the first side 101 of the phase center P of the antenna vibrator 100 and the area occupied by the dipole unit 210 on the second side 102 of the phase center P of the antenna vibrator 100, thereby improving the balance and aesthetics of the layout.

[0074] Continue reading Figure 7 When the antenna element 100 operates in the first frequency band, a parasitic current I1 may be generated in the first straight segment 211, and a parasitic current I2 may be generated in the second straight segment 213. Since the first straight segment 211 and the second straight segment 213 are located on different sides of the phase center P of the antenna element 100, and the length of the second straight segment 213 is less than the length of the first straight segment 211. Therefore, the directions of the parasitic current I1 and the parasitic current I2 are opposite, and the intensity of the parasitic current I1 is greater than the intensity of the parasitic current I2, so that the total parasitic current in the dipole unit 210 is in the same direction as the parasitic current I1, and thus the dipole unit 210 can generate a directional beam concentrated in the Z direction, thereby achieving the effect of improving the isolation between the antenna 10 and other antennas in the first frequency band.

[0075] In some embodiments of the present application, the ratio between the length of the first straight line segment 211 and the length of the second straight line segment 213 is greater than 2, for example, 3, 4, 5, etc. This ensures that a sufficiently strong parasitic current I can be generated in the dipole unit 210, thereby increasing the intensity of the directional beam generated by the dipole unit 210 and concentrated in the Z direction, thereby further increasing the isolation between the antenna 10 and other antennas in the first frequency band.

[0076] In some embodiments of the present application, the length of the dipole unit 210 may be λ / 4 to 3λ / 4, where λ is the wavelength of the signal at the center frequency of the first frequency band, thereby further improving the working performance of the dipole unit 210 in the first frequency band.

[0077] In some embodiments of the present application, along the Z direction, the distance between the first straight line segment 211 and the ground plane 400 is λ / 8 to 3λ / 8, where λ is the wavelength of the signal at the center frequency of the first frequency band, thereby further improving the radiation effect of the first straight line segment 211 .

[0078] In some embodiments of the present application, the length of the bending section 212 may be λ / 8 to λ / 4. Here, λ is the wavelength of the signal at the center frequency of the first frequency band. This ensures that the bending section 212 has a certain length so as to reduce the size occupied by the dipole unit 210 along the X direction. At the same time, the problem that the dipole unit 210 cannot work properly due to the bending section 212 being too long can also be avoided.

[0079] The above is an explanation of the implementation mode of the present application by specific specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Although the description of the present application will be introduced in conjunction with some embodiments, this does not mean that the features of this application are limited to the implementation mode. On the contrary, the purpose of introducing the application in conjunction with the implementation mode is to cover other options or modifications that may be extended based on the claims of the present application. The present application can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present application, some specific details are omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0080] In the description of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "outside", "inside", "circumferential", "radial", "axial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0081] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation", "connection" and "fitting" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0082] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. An antenna, characterized in that: It includes an antenna element and a parasitic unit, wherein: The parasitic unit is asymmetric with respect to the phase center of the antenna element, so that when the antenna element operates in a first frequency band, a parasitic current can be generated in the parasitic unit, and the first frequency band is a frequency band outside the operating frequency band of the antenna element; The parasitic unit can generate a beam concentrated in a first direction under the action of the parasitic current, and the first direction is the polarization direction of the antenna element.

2. The antenna according to claim 1, characterized in that The parasitic element includes a dipole element.

3. The antenna according to claim 2, characterized in that: The dipole unit includes a first straight line segment extending along a second direction, the angle between the second direction and the first direction is 45° to 90°, and the first straight line segment is asymmetrically arranged relative to the phase center of the antenna element.

4. The antenna according to claim 3, characterized in that: The dipole unit further includes a bending segment, and along the second direction, the bending segment is arranged on one side of the first straight segment and connected to the first straight segment.

5. The antenna according to claim 4, characterized in that: Along the second direction, the first straight line segment is arranged on a first side of a phase center of the antenna element, and the bent segment is arranged on a second side of the phase center of the antenna element.

6. The antenna according to claim 4, characterized in that: Along the second direction, a projection of the bending segment at least partially overlaps with a projection of the antenna element.

7. The antenna according to claim 4, characterized in that: The bending section includes one or more U-shaped structures or V-shaped structures.

8. The antenna according to claim 5, characterized in that: The dipole unit also includes a second straight line segment extending along the second direction. Along the second direction, the second straight line segment is arranged on a side of the bending segment away from the first straight line segment, and is connected to the first straight line segment through the bending segment, and the length of the second straight line segment is less than the length of the first straight line segment.

9. The antenna according to claim 8, characterized in that A ratio between the length of the first straight line segment and the length of the second straight line segment is greater than 2.

10. The antenna according to claim 2, characterized in that: The length of the dipole unit is λ / 4 to 3λ / 4, where λ is the wavelength of the signal at the center frequency of the first frequency band.

11. The antenna according to claim 4, characterized in that: The length of the bending section is λ / 8-λ / 4, where λ is the wavelength of the signal at the center frequency of the first frequency band.

12. The antenna according to claim 3, characterized in that: The antenna includes a ground plane, the plane where the ground plane is located is perpendicular to the first direction, and along the first direction, the antenna element and the parasitic unit are located on the same side of the ground plane, and the distance between the first straight line segment and the ground plane is λ / 8 to 3λ / 8, where λ is the wavelength of the signal at the center frequency of the first frequency band.

13. The antenna according to claim 1, characterized in that The antenna element includes a monopole antenna element, a planar inverted-F antenna element or a dipole antenna element.

14. The antenna according to claim 1, characterized in that The antenna further comprises a substrate, and the antenna and the parasitic unit are arranged on the substrate.

15. A wireless device, characterized in that: The wireless device comprises a housing, and the antenna according to any one of claims 1 to 14, wherein the antenna is arranged on the housing.

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