Antenna, antenna system and wireless device

Abstract

The invention provides an antenna, an antenna system and wireless equipment, and belongs to the technical field of communication. The antenna comprises a first radiation oscillator, a second radiation oscillator, a signal line, a grounding line and a decoupling line. The signal line is connected with the first radiation oscillator, the first end of the grounding line is connected with the second radiation oscillator, and the second end of the grounding line is grounded; the decoupling wire and the grounding wire are arranged in parallel, a first end of the decoupling wire is close to a first end of the grounding wire, a second end of the decoupling wire is close to a second end of the grounding wire, and the first end of the decoupling wire is grounded. By adopting the antenna disclosed by the invention, the out-of-roundness index of the low-frequency antenna can be improved through the decoupling line, the weakening grounding line and the influence on the low-frequency antenna near the antenna.

Description

Technical Field

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

[0002] An antenna, such as a dipole antenna, is generally placed above a bottom plate, and the spatial distance between the antenna and the bottom plate is λ1 / 4, where λ1 is the operating wavelength of the dipole antenna. The dipole antenna is connected to the bottom plate via a feeder.

[0003] The ground wire of the feeder acts as a reflector for a low-frequency antenna near the dipole antenna, which affects the radiation pattern of the low-frequency antenna, such as deteriorating the circularity index of the low-frequency antenna.

[0004] The sum of the electrical lengths of the ground wire in the feeder and the radiating element connected to the ground wire is relatively close to 1 / 4 of the operating wavelength of the low-frequency antenna near the dipole antenna, resulting in the ground wire of the feeder acting as a reflector for the low-frequency antenna, which affects the radiation pattern of the low-frequency antenna, such as deteriorating the circularity index of the low-frequency antenna. Summary of the Invention

[0005] The present disclosure provides an antenna, an antenna system, and a wireless device. The antenna can weaken the influence of the ground wire on a low-frequency antenna near the antenna through a decoupling wire, thereby improving the circularity index of the low-frequency antenna.

[0006] In a first aspect, the present disclosure provides an antenna, which includes a first radiating element, a second radiating element, a signal line, a ground wire, and a decoupling wire;

[0007] The signal line is connected to the first radiating element, the first end of the ground wire is connected to the second radiating element, and the second end of the ground wire is grounded;

[0008] The decoupling wire and the ground wire are arranged in parallel, the first end of the decoupling wire is close to the first end of the ground wire, the second end of the decoupling wire is close to the second end of the ground wire, and the first end of the decoupling wire is grounded.

[0009] In the solution shown in the present disclosure, the antenna includes a decoupling line. The decoupling line is arranged in parallel near the ground line. The first end of the decoupling line is close to the first end of the ground line, and the second end of the decoupling line is close to the second end of the ground line. Moreover, the second end of the ground line is grounded, and the first end of the decoupling line is grounded. Since the decoupling line is arranged in parallel with the ground line and the two ends of the decoupling line are respectively close to the two ends of the ground line, the distance between the decoupling line and the ground line is relatively small. Furthermore, when the ground line transmits current, an induced current can be generated on the decoupling line. Also, because the grounding positions of the decoupling line and the ground line are opposite, the direction of the current transmitted on the decoupling line is opposite to the direction of the current transmitted on the ground line. Once the direction of the current on the decoupling line is opposite to the direction of the current on the ground line, the electromagnetic waves radiated by the two are of equal amplitude and opposite phase, and an interference cancellation phenomenon occurs. Furthermore, the influence of the ground line on the low-frequency antenna near the antenna is weakened, and the circularity index of the low-frequency antenna is improved.

[0010] In a possible implementation manner, the first end of the decoupling line is connected to the ground line or the second radiating element.

[0011] In the solution shown in the present disclosure, since the second end of the ground line is grounded, the first end of the decoupling line can be grounded by connecting to the ground line. Since the first end of the ground line is connected to the second radiating element, the first end of the decoupling line can also be grounded by connecting to the second radiating element. Therefore, the first end of the decoupling line can be grounded by connecting to the ground line or the second radiating element.

[0012] In a possible implementation manner, the first end of the decoupling line is connected to the ground line at a position close to the second radiating element, or the first end of the decoupling line is connected to the second radiating element at a position close to the ground line.

[0013] In the solution shown in the present disclosure, the first end of the decoupling line is connected to the second radiating element. For example, since the first end of the decoupling line is close to the first end of the ground line and the first end of the ground line is connected to the second radiating element, the first end of the decoupling line can be connected to the second radiating element at a position close to the ground line nearby.

[0014] In the solution shown in the present disclosure, the first end of the decoupling line is connected to the ground line. For example, since the first end of the decoupling line is close to the first end of the ground line and the first end of the ground line is connected to the second radiating element, the first end of the decoupling line can be connected to the ground line at a position close to the second radiating element nearby.

[0015] In a possible implementation, the spacing between the decoupling line and the ground line is equal or unequal at each position, and is less than or equal to λ1 / 10, where λ1 is the operating wavelength of the antenna.

[0016] In the solution shown in the present disclosure, the spacing between the decoupling line and the ground line at different positions can be equal or unequal, but the spacing between the decoupling line and the ground line at each position is relatively small, such as less than λ1 / 10. In this way, on the one hand, the decoupling line can induce current, and on the other hand, the electromagnetic wave radiated by the decoupling line can produce a coherent cancellation phenomenon with the electromagnetic wave radiated by the ground line, thereby reducing the influence of the ground line on the nearby low-frequency antenna.

[0017] In a possible implementation, there is a spacing between the second end of the decoupling line and the bottom plate where the antenna is located.

[0018] In the solution shown in the present disclosure, there is a spacing between the second end of the decoupling line and the bottom plate to prevent both ends of the decoupling line from being grounded, which would cause the decoupling line to be short-circuited. In this way, only the first end of the decoupling line far from the bottom plate is grounded, and the second end of the decoupling line close to the bottom plate is not grounded, enabling the direction of the current induced on the decoupling line to be opposite to the direction of the current transmitted on the ground line.

[0019] In a possible implementation, the spacing between the second end of the ground line and the second end of the decoupling line in the vertical direction perpendicular to the bottom plate where they are located is less than or equal to 1 / 10λ1, where λ1 is the operating wavelength of the antenna.

[0020] In the solution shown in the present disclosure, the spacing between the second end of the ground line and the second end of the decoupling line in the vertical direction is less than or equal to 1 / 10λ1, making the second end of the ground line and the second end of the decoupling line relatively close in the vertical direction. In this way, any section of the ground line can be distributed opposite to the position of the decoupling line to cancel the electromagnetic wave radiated by the ground line at each position and weaken the influence of the ground line on the nearby low-frequency antenna.

[0021] In a possible implementation, the electrical length of the decoupling line is equal to or approximately equal to the electrical length of the ground line.

[0022] In the solution shown in the present disclosure, the electrical length of the decoupling line is equal to or approximately equal to the electrical length of the ground line, enabling the electromagnetic wave radiated by the decoupling line to cancel the electromagnetic wave radiated by the ground line at each position.

[0023] In a possible implementation, the electrical length of the decoupling line takes a value between λ1 / 4 and λ1 / 2, where λ1 is the operating wavelength of the antenna.

[0024] In a possible implementation, the first radiation element and the second radiation element are symmetrically distributed.

[0025] In the solution shown in the present disclosure, the first radiation element and the second radiation element are relatively distributed in position, one on the left side of the feeder and the other on the right side of the feeder. Among them, the lengths of the first radiation element and the second radiation element may be equal or may not be equal. The antenna may be a dipole antenna. The two radiation elements of a dipole antenna are usually of equal length and symmetrically distributed in position. Therefore, the lengths of the first radiation element and the second radiation element may be equal and symmetrically distributed in position.

[0026] In the solution shown in the present disclosure, the height of the first radiation element from the bottom plate where it is located and the height of the second radiation element from the bottom plate where it is located may be equal or may not be equal. The antenna may be a dipole antenna. The two radiation elements of a dipole antenna are usually arranged at the same height. Therefore, the height of the first radiation element from the bottom plate where it is located and the height of the second radiation element from the bottom plate where it is located may be equal.

[0027] In the solution shown in the present disclosure, no specific limitations are imposed on whether the lengths of the first radiation element and the second radiation element are equal or whether the heights from the bottom plate where they are located are equal.

[0028] In a second aspect, an antenna system is provided. The antenna system includes a bottom plate, a first antenna, and the antenna described in the first aspect.

[0029] The frequency of the first antenna is less than the frequency of the antenna, and both the first antenna and the antenna are arranged on the bottom plate.

[0030] In the solution shown in the present disclosure, the operating frequency of the first antenna is less than the operating frequency of the antenna. For example, the first antenna is a 2G antenna and the antenna is a 5G antenna.

[0031] In the solution shown in the present disclosure, both the first antenna and the antenna are arranged on the bottom plate. For example, the signal line, ground line, and decoupling line of the antenna are all printed on a circuit board (this circuit board is called a feeding circuit board), and this feeding circuit board is vertically located on the bottom plate. The first antenna may be a monopole antenna and is vertically arranged on the bottom plate.

[0032] In the solution shown in the present disclosure, in order to meet the isolation requirement between the first antenna and the antenna, generally, the first antenna and the antenna are separated by λ2 / 4, where λ2 is the operating wavelength of the first antenna.

[0033] Among them, the first antenna and the antenna being separated by λ2 / 4 may be the distance between the vertical plane where the first antenna is located and the vertical plane where the antenna is located.

[0034] In a third aspect, a wireless device is provided. The wireless device includes a radio frequency circuit and the antenna system described in the second aspect. The radio frequency circuit is configured to enable the antenna system to transmit and receive wireless signals.

[0035] In the solution shown in the present disclosure, the wireless device may be an AP device. The wireless device includes a radio frequency circuit and the antenna system described in the second aspect. Among them, between the radio frequency circuit and the radiation element in the antenna system, they are connected by a feeder. The radio frequency circuit is configured to enable the radiation element in the antenna system to transmit and receive wireless signals. Since the antenna system includes a first antenna and an antenna, therefore, between the radio frequency circuit and the radiation element of the antenna, they are connected by a feeder, and between the radio frequency circuit and the radiation element of the first antenna, they are connected by a feeder. Description of the Drawings

[0036] Figure 1 is a schematic diagram of an antenna system including a dipole antenna of the prior art and a first antenna;

[0037] Figure 2 is Figure 1 the cross-sectional pattern of the first antenna in the antenna system in

[0038] Figure 3 the cross-sectional pattern of the first antenna in the antenna system provided by an exemplary embodiment of the present disclosure at a polar coordinate of θ = 75 degrees;

[0039] Figure 4 is a schematic diagram of an antenna provided by an exemplary embodiment of the present disclosure;

[0040] Figure 5 is a schematic diagram of an antenna system provided by an exemplary embodiment of the present disclosure;

[0041] Figure 6 is a schematic diagram of an antenna provided by an exemplary embodiment of the present disclosure.

[0042] Description of the Reference Numerals

[0043] 100, bottom plate; 200, first antenna; 300, antenna.

[0044] 1, first radiation element; 2, second radiation element; 3, signal line; 4, ground line; 5, decoupling line. Detailed Embodiments

[0045] To make the objectives, technical solutions, and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the accompanying drawings.

[0046] This embodiment relates to an antenna, which may be a dipole antenna. The antenna is connected to the bottom plate through a feeder. The feeder includes a signal line for transmitting radio frequency signals and a ground line for grounding.

[0047] For example, as Figure 1 shown, it is a schematic diagram of an antenna system. Referring to Figure 1 shown, the antenna includes a first radiation element 1, a second radiation element 2, a signal line 3 and a ground line 4. Among them, the first radiation element 1 and the second radiation element 2 are two radiation units of the antenna and are arranged in parallel above the bottom plate 100. The signal line 3 and the ground line 4 are parallel double lines, forming the feeder of the antenna, located between the bottom plate 100 and the radiation unit of the antenna 200, and are usually printed on a circuit board, which is vertically located on the bottom plate 100. One end of the signal line 3 is connected to the first radiation element 1, and the other end is connected to the radio frequency circuit. One end of the ground line 4 is connected to the second radiation element 2, and the other end is connected to the bottom plate 100 for grounding.

[0048] Among them, for the convenience of description, the end of the signal line 3 connected to the first radiation element 1 is denoted as the first end of the signal line 3, and the end of the signal line 3 close to the bottom plate 100 is denoted as the second end of the signal line 3. Among them, the second end of the signal line 3 is also the feeding point, and the first end and the second end of the signal line 3 are the two ends of the signal line 3.

[0049] The end of the ground line 4 connected to the second radiation element 2 is denoted as the first end of the ground line 4, and the end of the ground line 4 connected to the bottom plate 100 is denoted as the second end of the ground line 4. The first end and the second end of the ground line 4 are the two ends of the ground line 4.

[0050] In one example, the positions of the first radiation element 1 and the second radiation element 2 are distributed relatively, one on the left side of the feeder and the other on the right side of the feeder. Among them, the length of the first radiation element 1 and the length of the second radiation element 2 may be equal or may not be equal. This antenna can be a dipole antenna. The two radiation elements of a dipole antenna usually have equal lengths and are symmetrically distributed in position. Therefore, the length of the first radiation element 1 and the length of the second radiation element 2 can be equal and are symmetrically distributed in position.

[0051] In one example, the height of the first radiation element 1 from the bottom plate 100 where it is located and the height of the second radiation element 2 from the bottom plate 100 where it is located may be equal or may not be equal. This antenna can be a dipole antenna. The two radiation elements of a dipole antenna are usually arranged at the same height. Therefore, the height of the first radiation element 1 from the bottom plate 100 where it is located and the height of the second radiation element 2 from the bottom plate 100 where it is located can be equal.

[0052] In this embodiment, there are no specific limitations on whether the lengths of the first radiating element 1 and the second radiating element 2 are equal, or whether their heights from the bottom plate 100 are equal. In the accompanying drawings, an example can be given where the first radiating element 1 and the second radiating element 2 have equal lengths, are symmetrically distributed in position, and are arranged at the same height.

[0053] For a wireless device where the antenna is located, such as an access point (AP) device, its integration level is relatively high. Then, multiple antennas are usually arranged on the bottom plate 100, and these multiple antennas share the bottom plate 100. For example, as Figure 1 shown, taking the arrangement of two antennas on the bottom plate 100 as an example, the antenna described in this embodiment is denoted as antenna 300, and the other antenna is denoted as the first antenna 200. The distance between the first antenna 200 and the antenna 300 is λ2 / 4, where λ2 is the operating wavelength of the first antenna 200.

[0054] Among them, the first antenna 200 can be a Figure 1 monopole antenna vertically arranged on the bottom plate 100 as shown.

[0055] If the operating frequency of the antenna 300 is approximately twice that of the first antenna 200, then the sum of the electrical length of the second radiating element 2 and the electrical length of the ground wire 4 printed on the circuit board is relatively close to 1 / 4 of the operating wavelength of the first antenna 200. Then, the ground wire 4 can act as a reflector for the first antenna 200 and affect the radiation pattern of the first antenna 200. For example, it will deteriorate the circularity index of the first antenna 200.

[0056] For example, the antenna 300 is a 5G antenna with an operating frequency band between 5.15 and 5.85 GHz, and the first antenna 200 is a 2G antenna with an operating frequency band between 2.4 and 2.5 GHz. The electrical length of the second radiating element 2 is λ1 / 4, and the electrical length of the ground wire 4 printed on the circuit board is λ1 / 4, where λ1 is the operating wavelength of the antenna 300. And the operating wavelength λ1 of the antenna 300 has a 2-fold relationship with the operating wavelength λ2 of the first antenna 200. Therefore, the sum of the electrical length of the second radiating element 2 and the electrical length of the ground wire 4 printed on the circuit board is approximately λ2 / 4.

[0057] Among them, the circularity index of the antenna is a parameter for evaluating the performance of the antenna, which refers to the degree of uneven distribution of the transmitted or received power of the antenna. A better circularity index means a lower degree of uneven distribution of the transmitted or received power of the antenna, and a deteriorated circularity index means a higher degree of uneven distribution of the transmitted or received power of the antenna.

[0058] The non-circularity index of the antenna can be judged by the antenna pattern. For example, in the cross-sectional pattern at a certain angle of θ in the three-dimensional spherical coordinate system, the maximum value minus the minimum value on a circle in the circumferential direction. If this difference is below 10 dB, it can be considered that the non-circularity index of the antenna is relatively good. If this difference exceeds 10 dB, it is considered that the non-circularity index of the antenna is relatively poor.

[0059] For example, as Figure 2 shown, for the first antenna 200 as Figure 1 shown, in its operating frequency band, the cross-sectional pattern at θ = 75 degrees. Referring to Figure 2 shown, at φ = 180 degrees, there is an obvious depression in this cross-sectional pattern. Referring to Figure 2 shown, the non-circularity index of the first antenna is greater than 15 dB, exceeding 10 dB. Therefore, for the antenna 300 as Figure 1 shown, it will cause the non-circularity index of the first antenna 200 to deteriorate.

[0060] It should be noted that, unless otherwise specified in this embodiment, the lengths mentioned are all electrical lengths, that is, the path length that the current travels.

[0061] To improve the non-circularity index of the first antenna 200, correspondingly, as Figure 4 shown is the schematic structural diagram of the antenna 300. As Figure 5 shown is Figure 4 the schematic diagram of the antenna shown, applied in the antenna system.

[0062] Referring to Figure 4 shown, the antenna 300 further includes a decoupling line 5. The decoupling line 5 and the ground line 4 are arranged in parallel, and the first end of the decoupling line 5 is close to the first end of the ground line 4, and the second end of the decoupling line 5 is close to the second end of the ground line 4. The first end of the decoupling line 5 is grounded.

[0063] Referring to Figure 4 shown, because the first end of the decoupling line 5 is adjacent to the first end of the ground line 4, the second end of the decoupling line 5 is adjacent to the second end of the ground line 4, and the decoupling line 5 and the ground line 4 are arranged in parallel, then the decoupling line 5 and the ground line 4 are close to each other and the distance between them is relatively small. Then, when a current is transmitted in the ground line 4, a current can also be induced on the decoupling line 5.

[0064] Also, because the grounding positions of the decoupling line 5 and the ground line 4 are opposite in the current transmission path, the current direction transmitted on the decoupling line 5 is opposite to the current direction transmitted on the ground line 4. For example, when the current is transmitted in the up-down direction, the grounding position of the ground line 4 is at the bottom and the grounding position of the decoupling line 5 is at the top. Then, when the current transmitted on the ground line 4 is from top to bottom, the current transmitted on the decoupling line 5 is from bottom to top.

[0065] Therefore, when the decoupling line 5 is relatively close to the ground wire 4 and the direction of the current transmitted on the decoupling line 5 is opposite to the direction of the current transmitted on the ground wire 4, the electromagnetic waves radiated by the decoupling line 5 and the electromagnetic waves radiated by the ground wire 4 cancel each other out. Then, the ground wire 4 no longer serves as the reflector of the first antenna 200, and further, the ground wire 4 no longer affects the radiation pattern of the first antenna 200, thereby improving the circularity index of the first antenna 200.

[0066] For example, as Figure 3 shown, in the antenna system as Figure 5 shown, for the first antenna 200, in its operating frequency band, the radiation pattern of the cross-section at θ = 75 degrees is as shown in Figure 3 shown. As shown in Figure 2 shown, the degree of depression of this cross-section radiation pattern at φ = 180 degrees is significantly reduced compared to the cross-section radiation pattern as Figure 3 shown. As shown in

[0067] wherein, Figure 2 and Figure 3 shown cross-section radiation patterns correspond to the same frequency point and the same θ angle.

[0068] Next, the characteristics of the antenna 300 are introduced.

[0069] As described above, the first end of the decoupling line 5 is grounded, and there are multiple schemes for grounding the first end of the decoupling line 5. For example, one scheme can be that, as shown in Figure 4 shown, the first end of the decoupling line 5 is connected to the second radiation element 2. Since the first end of the decoupling line 5 is close to the first end of the ground wire 4, and the first end of the ground wire 4 is connected to the second radiation element 2, the first end of the decoupling line 5 can be connected to the position of the second radiation element 2 close to the ground wire 4.

[0070] Another example, another scheme for grounding the first end of the decoupling line 5 can be that, as shown in Figure 6 shown, which is another schematic diagram of the antenna. As shown in Figure 6 shown, the first end of the decoupling line 5 is connected to the ground wire 4. Since the first end of the decoupling line 5 is close to the first end of the ground wire 4, and the first end of the ground wire 4 is connected to the second radiation element 2, the first end of the decoupling line 5 can be connected to the position of the ground wire 4 close to the second radiation element 2.

[0071] The above is because the second end of the ground wire 4 is grounded. Therefore, the first end of the decoupling wire 5 can be grounded by connecting to the ground wire 4. Since the first end of the ground wire 4 is connected to the second radiating element 2, the first end of the decoupling wire 5 can also be grounded by connecting to the second radiating element 2.

[0072] The first end of the decoupling wire 5 can also be directly connected to the bottom plate 100 where the antenna is located through a transmission line to achieve grounding. However, since the first end of the decoupling wire 5 is far from the bottom plate 100, the first end of the decoupling wire 5 can be connected to the ground wire 4 or the second radiating element 2 nearby.

[0073] In one example, the decoupling wire 5 and the ground wire 4 are arranged in parallel. For example, if the ground wire 4 is a straight line segment vertically arranged between the bottom plate 100 and the second radiating element 2, then the decoupling wire 5 is also a straight line segment vertically arranged on the bottom plate 100. Another example is that, as Figure 4 shown, if the ground wire 4 is a bent line segment, then the decoupling wire 5 is also a bent line segment, and the layout direction of the decoupling wire 5 from its first end to its second end is the same as that of the ground wire 4 from its first end to its second end.

[0074] In one example, the distance between the decoupling wire 5 and the ground wire 4 is relatively small, for example, less than λ1 / 10. Continuing to refer to Figure 4 shown, the distances between the decoupling wire 5 and the ground wire 4 at different positions can be equal or unequal, but the distances between the decoupling wire 5 and the ground wire 4 at each position are relatively small, such as all less than λ1 / 10.

[0075] In one example, the electrical length of the decoupling wire 5 is equal to or approximately equal to the electrical length of the ground wire 4. For example, the electrical length of the decoupling wire 5 is slightly less than the electrical length of the ground wire 4.

[0076] In one example, the electrical length of the decoupling wire 5 can be in the range of λ1 / 4 to λ1 / 2.

[0077] In one example, to prevent the second end of the decoupling wire 5 close to the bottom plate 100 from having electrical coupling with the bottom plate 100 and resulting in the second end of the decoupling wire 5 also being grounded, correspondingly, as Figure 4 shown, there is a distance between the second end of the decoupling wire 5 and the bottom plate 100.

[0078] In this way, only the first end of the decoupling wire 5 far from the bottom plate 100 is grounded, and the second end of the decoupling wire 5 close to the bottom plate 100 is not grounded, so that the direction of the induced current on the decoupling wire 5 can be opposite to the direction of the current transmitted on the ground wire 4.

[0079] And in order to make each position of the ground wire 4 opposite to the position of the decoupling wire 5, correspondingly, referring to Figure 4As shown, the second end of the ground wire 4 and the second end of the decoupling wire 5 are relatively close in the vertical direction perpendicular to the bottom plate 100. In this way, any section of the ground wire 4 can be distributed relative to the position of the decoupling wire 5.

[0080] For example, as Figure 6 shown, the distance h between the second end of the ground wire 4 and the second end of the decoupling wire 5 in the vertical direction perpendicular to the bottom plate 100 where they are located is less than or equal to 1 / 10λ1.

[0081] In one example, as described above, the signal wire 3 and the ground wire 4 are usually printed on a circuit board. Then, the decoupling wire 5 can also be printed on the circuit board. That is, the signal wire 3, the ground wire 4, and the decoupling wire 5 are printed on the same circuit board, and this circuit board can be denoted as the feeding circuit board.

[0082] In one example, the radiation unit of the antenna can also be printed on a circuit board. For example, the first radiation element 1 and the second radiation element 2 can be printed on another circuit board, and this circuit board can be denoted as the radiation element circuit board.

[0083] In one example, the feeding circuit board on which the signal wire 3, the ground wire 4, and the decoupling wire 5 are printed can be vertically arranged on the bottom plate 100, and the radiation element circuit board on which the first radiation element 1 and the second radiation element 2 are printed can be parallel to the bottom plate 100.

[0084] In the embodiment of the present disclosure, the antenna includes a decoupling wire 5. The decoupling wire 5 is arranged parallel to the ground wire 4. The first end of the decoupling wire 5 is close to the first end of the ground wire 4, and the second end of the decoupling wire 5 is close to the second end of the ground wire 4. Moreover, the second end of the ground wire 4 is grounded, and the first end of the decoupling wire 5 is grounded. Since the decoupling wire 5 is arranged parallel to the ground wire 4 and the two ends of the decoupling wire 5 are respectively close to the two ends of the ground wire 4, the distance between the decoupling wire 5 and the ground wire 4 is relatively small. Furthermore, when the ground wire 4 transmits current, an induced current can be generated on the decoupling wire 5. Also, because the grounding positions of the decoupling wire 5 and the ground wire 4 are opposite, the direction of the current transmitted on the decoupling wire 5 is opposite to the direction of the current transmitted on the ground wire 4. Once the direction of the current on the decoupling wire 5 is opposite to the direction of the current on the ground wire 4, the electromagnetic waves radiated by the two are of equal amplitude and opposite phase, and an interference cancellation phenomenon occurs. Thus, the influence of the ground wire 4 on the low-frequency antenna near the antenna is weakened, and the non-circularity index of the low-frequency antenna is improved.

[0085] This embodiment also provides an antenna system. Refer to Figure 5 shown, the antenna system includes a bottom plate 100, a first antenna 200, and an antenna 300. The antenna 300 can be the antenna as Figure 4 shown, or can also be the antenna as Figure 6 shown.

[0086] Among them, the operating frequency of the first antenna 200 is less than that of the antenna 300. For example, the first antenna 200 is a 2G antenna, and the antenna 300 is a 5G antenna.

[0087] Reference Figure 5 As shown, both the first antenna 200 and the antenna 300 are arranged on the bottom plate 100. For example, the signal line 3, the ground line 4, and the decoupling line 5 of the antenna 300 are all printed on a circuit board (this circuit board is called a feeding circuit board), and this feeding circuit board is vertically located on the bottom plate 100. The first antenna 200 can be a monopole antenna and is vertically arranged on the bottom plate 100.

[0088] In one example, in order to meet the isolation requirement between the first antenna 200 and the antenna 300, generally, the first antenna 200 and the antenna 300 are separated by λ2 / 4, where λ2 is the operating wavelength of the first antenna 200.

[0089] Among them, the first antenna 200 and the antenna 300 being separated by λ2 / 4 can be the distance between the vertical plane where the first antenna 200 is located and the vertical plane where the antenna 300 is located.

[0090] Regarding the characteristics of the antenna 300 in the antenna system, reference can be made to the above, and details will not be repeated here.

[0091] The embodiments of the present disclosure also provide a wireless device. This wireless device can be an AP device. This wireless device includes a radio frequency circuit and the above-mentioned antenna system. Among them, between the radio frequency circuit and the radiation elements in the antenna system, they are connected by a feeder. The radio frequency circuit is used to enable the radiation elements in the antenna system to receive and transmit wireless signals. Since the antenna system includes the first antenna and the antenna, therefore, between the radio frequency circuit and the radiation element of the antenna, they are connected by a feeder, and between the radio frequency circuit and the radiation element of the first antenna, they are connected by a feeder.

Claims

1. An antenna, characterized in that, The antenna includes a first radiation element (1), a second radiation element (2), a signal line (3), a ground line (4), and a decoupling line (5); The signal line (3) is connected to the first radiation element (1), the first end of the ground line (4) is connected to the second radiation element (2), and the second end of the ground line (4) is grounded; The decoupling line (5) and the ground line (4) are arranged in parallel, and the first end of the decoupling line (5) is close to the first end of the ground line (4), the second end of the decoupling line (5) is close to the second end of the ground line (4), and the first end of the decoupling line (5) is grounded.

2. The antenna according to claim 1, characterized in that, The first end of the decoupling line (5) is connected to the ground line (4) or the second radiation element (2).

3. The antenna according to claim 1 or 2, characterized in that, The first end of the decoupling line (5) is connected to a position of the ground line (4) close to the second radiation element (2), or the first end of the decoupling line (5) is connected to a position of the second radiation element (2) close to the ground line (4).

4. The antenna according to any one of claims 1 to 3, characterized in that, The spacing between the decoupling line (5) and the ground line (4) is equal or unequal at each position, and is less than or equal to λ1 / 10, where λ1 is the operating wavelength of the antenna.

5. The antenna according to any one of claims 1 to 4, characterized in that, There is a spacing between the second end of the decoupling line (5) and the bottom plate (100) where the antenna is located.

6. The antenna according to any one of claims 1 to 5, characterized in that, The spacing between the second end of the ground line (4) and the second end of the decoupling line (5) in the vertical direction perpendicular to the bottom plate (100) is less than or equal to 1 / 10λ1, where λ1 is the operating wavelength of the antenna.

7. The antenna according to any one of claims 1 to 6, characterized in that, The electrical length of the decoupling line (5) is equal to or approximately equal to the electrical length of the ground line (4).

8. The antenna according to claim 7, characterized in that, The electrical length of the decoupling line (5) takes a value between λ1 / 4 and λ1 / 2, where λ1 is the operating wavelength of the antenna.

9. An antenna system, characterized in that, The antenna system includes a bottom plate (100), a first antenna (200), and the antenna (300) according to any one of claims 1 to 8; The frequency of the first antenna (200) is less than the frequency of the antenna (300), and both the first antenna (200) and the antenna (300) are arranged on the bottom plate (100).

10. A wireless device, characterized in that, The wireless device includes a radio frequency circuit and the antenna system according to claim 9, and the radio frequency circuit is used to make the antenna system transmit and receive wireless signals.

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