Low-radiation feed network antenna device

Abstract

The invention provides a low-radiation feed network and an antenna device. The feed network comprises an excitation part, a power division part and a transmission line, the excitation part is used for being connected with a radiation unit, the starting end of the transmission line is electrically connected with the excitation part, and the terminating end of the transmission line is electrically connected with the power division part; the transmission line comprises at least one first transmission section extending in the first direction, the number of the first transmission sections and the phase of the mth first transmission section meet the following formula: # imgabs0 #, n represents the number of the first transmission sections, m represents the mth first transmission section starting from the starting end, and m represents the phase of the mth first transmission section starting from the starting end; and alpha m represents the phase of the mth first transmission segment starting from the starting end. According to the antenna device, the suppression capability on a side lobe can be effectively improved, the interference beam of one antenna device on another adjacent antenna device can be weakened, and an effective anti-interference effect is formed.

Description

Technical Field

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

[0002] In multi-antenna networking scenarios such as office and industrial use, a large number of antenna devices share the same channel, causing serious co-channel interference. Among them, the antenna device's feeder radiates a large amount in the sidelobe direction, which directly affects the antenna device's anti-interference performance. Summary of the invention

[0003] The purpose of the present application is to provide a low-radiation feeding network and an antenna device to enhance the sidelobe suppression capability of the antenna device and improve the anti-interference effect.

[0004] In a first aspect, the present application provides a low-radiation feeding network. The feeding network includes an excitation part, a power division part, and a transmission line, wherein the excitation part is used to connect a radiating unit, the starting end of the transmission line is electrically connected to the excitation part, and the terminating end of the transmission line is electrically connected to the power division part; the transmission line includes at least one first transmission segment extending along a first direction, and the number of the first transmission segments and the phase of the mth first transmission segment satisfy the following formula:

[0005]

[0006] Wherein, n represents the number of first transmission segments, m represents the mth first transmission segment starting from the starting end, α m Represents the phase of the mth first transmission segment starting from the starting end.

[0007] The present application can effectively improve the ability to suppress side lobes, and can weaken the interference beam of one antenna device to another adjacent antenna device, thereby forming an effective anti-interference effect.

[0008] In a possible design, at least part of the first transmission segment is a straight line. When there are multiple first transmission segments, each first transmission segment can be a straight line, which is convenient for arranging each first transmission segment and is also conducive to improving the compactness of the feed network and realizing a miniaturized design.

[0009] In a possible design, the transmission line further includes at least one second transmission segment, at least one end of the second transmission segment is connected to at least one first transmission segment, the second transmission segment extends along a second direction, and an angle is formed between the second direction and the first direction. The first transmission segment and the second transmission segment can be bent to form a certain angle, so that each first transmission segment can extend in the first direction, and each first transmission segment can be arranged in the radial direction of the transmission line, and both ends of the transmission line can be connected to the excitation part and the power division part.

[0010] In a possible design, the angle is between 0° and 360°. Within this angle range, the arrangement of each first transmission segment can be facilitated, and the overall miniaturization design of the transmission line can also be facilitated.

[0011] In a possible design, at least two of the first transmission segments and the second transmission segments are provided, and the first transmission segments and the second transmission segments are provided alternately. Thus, the bending direction of two adjacent first transmission segments can be changed by each second transmission segment, so that the physical length direction of each first transmission segment is parallel to the first direction, and the electromagnetic wave propagation directions on the two adjacent first transmission segments are opposite, so that the total number of first transmission segments and the phase of each first transmission segment can satisfy the above formula, thereby achieving the reduction of the radiation intensity of the feeding network and weakening the beam that interferes with the adjacent antenna device.

[0012] In a possible design, at least part of the first transmission segments are arcs. Each first transmission segment can be an arc, or part of the first transmission segments can be an arc and another part of the first transmission segments can be a straight line, so that the design shape of the first transmission segment can be more flexible and can meet different feeding network setting scenarios.

[0013] In a possible design, when the number of the first transmission segments is more than two, each of the first transmission segments is formed by bending the transmission line. The transmission line may be an overall linear structure with a relatively long length, and each of the first transmission segments and each of the second transmission segments can be formed by bending the corresponding portion of the transmission line in a specific direction, thereby facilitating the design and manufacture of the first transmission segment and the second transmission segment, and ensuring the reliability of the overall structure of the transmission line.

[0014] In a possible design, the number of the first transmission segments is more than two, and the bending directions of two adjacent first transmission segments are opposite.

[0015] In one possible design, the wavelength of the electromagnetic waves transmitted by each of the first transmission segments is the same, so that the phase of each first transmission segment and the total number of first transmission segments can satisfy the aforementioned formula, thereby reducing the radiation intensity of the feeding network and weakening the beam that interferes with the adjacent antenna device.

[0016] In one possible design, the transmission line is a microstrip line or a parallel double line, so that it can be easily bent to form a first transmission segment and a second transmission segment, and has excellent characteristics such as small size, light weight, wide bandwidth, high reliability and low manufacturing cost.

[0017] In a second aspect, the present application further provides an antenna device, which includes a radiating unit and a low-radiation feeding network provided in the first aspect of the present application, wherein the low-radiation feeding network is connected to the radiating unit and is used to feed the radiating unit. The antenna device including the aforementioned low-radiation feeding network has a similar technical effect as the aforementioned feeding network.

[0018] In a possible design, a plurality of the low-radiation feeding networks are provided, the radiating unit includes at least one antenna element, and a plurality of the low-radiation feeding networks are connected to at least one of the antenna elements.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the radiation of antenna devices in two adjacent access points;

[0021] Figure 2 A schematic diagram of a low-radiation feeding network provided in an embodiment of the present application in application;

[0022] Figure 3 A schematic diagram of the structure of a low-radiation feeding network provided in an embodiment of the present application;

[0023] Figure 4 is the normalized field strength pattern in the vertical coordinate;

[0024] Figure 5 This is the directional diagram of the antenna device provided in an embodiment of the present application.

[0025] Description of reference numerals:

[0026] 10- Feeding network;

[0027] 1- Motivational part;

[0028] 2-Power division part;

[0029] 3- Transmission line;

[0030] 31-first transmission segment;

[0031] 31a-first transmission segment;

[0032] 31b-first transmission segment;

[0033] 32-second transmission segment;

[0034] 32a - second transmission segment;

[0035] 32b-second transmission segment;

[0036] 4-Radiation unit;

[0037] TE-terminal equipment;

[0038] AP1-antenna device;

[0039] AP2 - antenna assembly;

[0040] F-interference beam.

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0042] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

[0043] In the description of this application, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "plurality" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] With the diversification of wireless LAN business scenarios, for example, in offices, industries, etc., multiple access points (APs) are configured with antenna devices. In these access point networking scenarios, a large number of access point antenna devices share the same channel, which causes serious co-channel interference.

[0045] Figure 1 This is a schematic diagram of the radiation of the antenna device in two adjacent access points. Figure 1, Figure 1 The example shows the case where there are two access points, each of which is equipped with an antenna device, namely AP1 and AP2, and each antenna device can be interconnected with a terminal equipment (TE). The terminal equipment TE can be a mobile phone, a tablet computer, a desktop computer, a laptop computer, a handheld computer, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a cellular phone, a personal digital assistant (PDA), an augmented reality (AR) device, a virtual reality (VR) device, an artificial intelligence (AI) device, a wearable device, a vehicle-mounted device, a smart home device and / or a smart city device. The embodiment of the present application does not impose any special restrictions on the specific type of the terminal equipment.

[0046] The antenna device of each access point has a certain main radiation range, within which the terminal device can be normally connected to the Internet. For example, Figure 1 The angle range of θ1 shown is the main radiation range of the antenna device. Figure 1 , the antenna device AP1 has an interference beam F in the angle direction of θ2, and the interference beam F will interfere with the antenna device AP2 in another adjacent access point. Of course, the antenna device AP2 also has an interference beam that interferes with the antenna device AP1.

[0047] In order to weaken the above-mentioned interference beam, the embodiment of the present application provides a low-radiation feeding network (hereinafter referred to as the feeding network 10), Figure 2 This is a schematic diagram of the low radiation feeding network provided in the embodiment of the present application in application, refer to Figure 2 The radio feeding network 10 can be applied in an antenna device, which can be integrated in a wireless router, a base station, etc. The antenna device includes a radiation unit 4, which can radiate electromagnetic signals to the outside. The feeding network 10 can be connected to the radiation unit 4 to feed the radiation unit 4.

[0048] The radiation unit 4 may include at least one antenna element, which converts the waveguide energy from the transmitter into radio waves, or converts the radio waves into waveguide energy, for radiating and receiving radio waves. A feed network may be connected to one antenna element, or may be connected to multiple antenna elements, or multiple feed networks may be connected to one antenna element.

[0049] In one embodiment, Figure 3 The schematic diagram of the structure of the low radiation feeding network provided in the embodiment of the present application is shown in FIG. Figure 3 The feed network 10 includes an excitation part, a power division part 2 and a transmission line 3. Figure 2 The excitation part is used to connect the radiation unit 4, which can be specifically connected to the feeding point of the antenna element, and is used to feed the antenna element. The power division part 2 is used to distribute the input signal to multiple output ports so as to transmit the signal in different directions. One end of the transmission line 3 is the starting end, and the other end is the terminating end. The starting end of the transmission line 3 is electrically connected to the excitation part, and the terminating end of the transmission line 3 is electrically connected to the power division part 2.

[0050] Among them, refer to Figure 3 , the transmission line 3 includes at least one first transmission segment 31 extending along the first direction, and the number n of the first transmission segments 31 and the phase of the mth first transmission segment 31 satisfy the following formula (1):

[0051]

[0052] Where n represents the number of first transmission segments 31, m represents the mth first transmission segment 31 starting from the starting end, and α m represents the phase of the mth first transmission segment 31 starting from the starting end.

[0053] The above formula reflects the relationship between the total number of first transmission segments 31 and the phase of the mth first transmission segment 31, wherein the phase of the first transmission segment 31 corresponds to a uniquely determined length. Specifically, the length of the first transmission segment 31 can be obtained according to the following formula (2):

[0054]

[0055] Wherein, λ is the working wavelength of the electromagnetic wave in the first transmission section 31, l m is the length of the mth first transmission segment 31.

[0056] It can be seen from the above formula (2) that when the phase α of the mth first transmission segment 31 is determined according to formula (1), mAfter that, the length of the m-th first transmission segment 31 can be obtained according to formula (2). In the design of the feeding network 10, for example, the number of first transmission segments 31 can be firstly determined, and the phase of each first transmission segment 31 can be determined according to formula (1). Then, according to formula (2), the corresponding length can be obtained according to the phase of each first transmission segment 31, thereby completing the design of the transmission line 3. For example, the number of first transmission segments 31 and the phase of each first transmission segment 31 can also be determined at the same time, and verified by formula (1). If formula (1) is not satisfied, the number of first transmission segments 31 or the phase of part of the first transmission segments 31 can be adjusted, thereby also realizing the design of the transmission line 3.

[0057] Figure 4 The vertical coordinate is normalized for the field strength pattern, the horizontal coordinate represents the phase, and the vertical coordinate represents the radiation intensity, wherein curve a represents the field strength curve when n=1, curve b represents the field strength curve when n=2, curve c represents the field strength curve when n=3, curve d represents the field strength curve when n=4, and curve e represents the field strength curve when n=5.

[0058] For example, when n=1, refer to Figure 4 As shown in curve a, the transmission line 3 includes a first transmission section 31. The transmission line 3 can be a straight line or an arc. When the length of the transmission line 3 corresponds to the phase α1=0 or 360°, the radiation intensity of the feeding network 10 is minimum.

[0059] For example, when n=2, refer to Figure 4 As shown in curve b, the transmission line 3 includes two first transmission segments 31, and the directions of propagating electromagnetic waves in the two first transmission segments 31 are opposite to each other. The field intensity of curve b at the positions corresponding to the phases of 90° and 270° is the smallest, that is, when the length of the first transmission segment 31 corresponds to the phases of 90° and 270°, the feeding network 10 has the smallest radiation intensity.

[0060] For example, when n=3, refer to Figure 4 As shown in curve c, the transmission line 3 includes three first transmission segments 31, and the directions of electromagnetic wave propagation of two adjacent first transmission segments 31 are opposite to each other. The field intensity of curve c is the smallest at the positions corresponding to the phases of 60°, 120°, 240° and 300°, that is, when the length of the first transmission segment 31 corresponds to the phases of 60°, 120°, 240° and 300°, the feeding network 10 has the smallest radiation intensity.

[0061] For example, when n=4, refer to Figure 4As shown in curve d, the transmission line 3 includes four first transmission segments 31, and the directions of electromagnetic wave propagation of two adjacent first transmission segments 31 are opposite to each other. The field intensity of curve d is the smallest at the positions corresponding to phases of 45°, 90°, 135°, 225°, 270° and 315°, that is, when the length of the first transmission segment 31 corresponds to phases of 45°, 90°, 135°, 225°, 270° and 315°, the feeding network 10 has the smallest radiation intensity.

[0062] For example, when n=5, refer to Figure 4 As shown in curve e, the transmission line 3 includes five first transmission segments 31, and the directions of electromagnetic wave propagation of two adjacent first transmission segments 31 are opposite to each other. The field intensity of curve e is the smallest at the positions corresponding to phases of 36°, 72°, 108°, 144°, 216°, 252°, 288° and 324°, that is, when the length of the first transmission segment 31 corresponds to phases of 36°, 72°, 108°, 144°, 216°, 252°, 288° and 324°, the feeding network 10 has the smallest radiation intensity.

[0063] Figure 5 The directional diagram of the antenna device provided in the embodiment of the present application, the horizontal axis is the phase, and the vertical axis is the gain. Curve f is the gain curve of the traditional antenna device, and curve g is the gain curve of the antenna device provided in the present application. Figure 5 , the position where the side lobes of curves f and g appear corresponds to the phase angle of -67° to -90°, the gain of curve f at the side lobe is close to -10dBi, and the gain of curve g at the side lobe is close to -18dBi. It can be seen that the antenna device in the present application adopts the above-mentioned low-radiation feeding network 10, which can effectively improve the ability to suppress the side lobes and weaken Figure 1 The interference beam in the angle direction of θ2 shown in the figure forms an effective anti-interference effect.

[0064] In one embodiment, at least part of the first transmission section 31 is a straight line. Figure 2 and Figure 3 When there are multiple first transmission segments 31, each first transmission segment 31 can be a straight line, which is convenient for the arrangement of each first transmission segment 31, and is also conducive to improving the compactness of the feed network 10 and realizing a miniaturized design. In one embodiment, each straight first transmission segment 31 can be formed by reciprocating bending of a transmission line 3, which is convenient for processing and manufacturing.

[0065] In one embodiment, at least part of the first transmission segments 31 may be arcs. Optionally, each first transmission segment 31 may be an arc, or part of the first transmission segments 31 may be an arc, and another part of the first transmission segments 31 may be a straight line, so that the design shape of the first transmission segment 31 can be more flexible and can meet different settings of the feed network 10. Of course, in some other embodiments, the first transmission segment may also be other shapes, such as a wavy line.

[0066] In one embodiment, referring to Figure 3 The transmission line 3 also includes at least one second transmission segment 32, at least one end of which is connected to at least one first transmission segment 31, and the second transmission segment 32 extends along the second direction, and there is an angle between the second direction and the first direction. The first transmission segment 31 and the second transmission segment 32 can be bent to form a certain angle, so that each first transmission segment 31 can extend in the first direction, and each first transmission segment 31 can be arranged in the radial direction of the transmission line 3, and both ends of the transmission line 3 can be connected to the excitation part and the power division part 2.

[0067] In one embodiment, the angle between the second direction and the first direction is between 0 and 360 degrees. Within this angle range, it is convenient to arrange the first transmission segments 31, and it is also beneficial to the overall miniaturization design of the transmission line 3. In one embodiment, the first transmission segment 31 is perpendicular to the second transmission segment 32, which is beneficial to the size control of the first transmission segment 31 and the second transmission segment 32 in the first direction and the second direction, and it is beneficial to realize the miniaturization design of the feeding network 10.

[0068] When there are multiple second transmission segments 32 , the propagation directions of the electromagnetic waves on each second transmission segment 32 are the same.

[0069] In one embodiment, at least two first transmission segments 31 and second transmission segments 32 are provided, and the first transmission segments 31 and second transmission segments 32 are arranged alternately. Figure 3 , Figure 3The feed network 10 shown includes two first transmission segments 31a and 31b, and two second transmission segments 32a and 32b, one end of the second transmission segment 32a is connected to the power division part 2, the other end of the second transmission segment 32a is connected to one end of the first transmission segment 31a, and the second transmission segment 32a and the first transmission segment 31a are bent at a right angle. Wherein, relative to the second transmission segment 32a, the first transmission segment 31a is bent to the right. One end of the first transmission segment 31a away from the second transmission segment 32a is connected to one end of the second transmission segment 32b, and the second transmission segment 32b and the first transmission segment 31a are bent at a right angle. One end of the first transmission segment 31b is connected to one end of the second transmission segment 32b away from the first transmission segment 31a, and the first transmission segment 31 and the second transmission segment 32b are bent at a right angle. Wherein, relative to the second transmission segment 32b, the first transmission segment 31b is bent to the left. That is, the bending directions of the adjacent first transmission segments 31 a and 31 b are opposite, and the propagation directions of the electromagnetic waves are opposite.

[0070] Thus, the bending direction of two adjacent first transmission segments 31 can be changed through each second transmission segment 32, so that the physical length direction of each first transmission segment 31 is parallel to the first direction, and the electromagnetic wave propagation directions on the two adjacent first transmission segments 31 are opposite, so that the total number of first transmission segments 31 and the phase of each first transmission segment 31 can satisfy the above formula (1), thereby achieving the reduction of the radiation intensity of the feeding network 10 and weakening the beam that interferes with the adjacent antenna device.

[0071] In one embodiment, when the number of the first transmission segments 31 is more than two, each first transmission segment 31 is formed by bending the transmission line 3. The transmission line 3 may be an overall linear structure with a relatively large length, and each first transmission segment 31 and each second transmission segment 32 may be formed by bending the corresponding portion of the transmission line 3 in a specific direction, thereby facilitating the design and manufacture of the first transmission segment 31 and the second transmission segment 32, and at the same time ensuring the reliability of the overall structure of the transmission line 3.

[0072] In one embodiment, the wavelengths of electromagnetic waves transmitted by the first transmission segments 31 are the same, so that the phases of the first transmission segments 31 and the total number of the first transmission segments 31 can satisfy the aforementioned formula (1), thereby reducing the radiation intensity of the feeding network 10 and weakening the beams that interfere with adjacent antenna devices.

[0073] In one embodiment, the transmission line 3 is a microwave transmission line. For example, the transmission line 3 can be a microstrip line or a parallel double line, so that it can be easily bent to form the first transmission section 31 and the second transmission section 32, and has excellent characteristics such as small size, light weight, wide bandwidth, high reliability and low manufacturing cost. Of course, in some other embodiments, the transmission line can also be other types of microwave transmission lines.

[0074] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A low radiation feeding network, characterized in that: include: An excitation part, used for connecting a radiation unit; Merit section; A transmission line, wherein the starting end of the transmission line is electrically connected to the excitation part, and the terminating end of the transmission line is electrically connected to the power division part; the transmission line comprises at least one first transmission segment extending along a first direction, and the number of the first transmission segments and the phase of the mth first transmission segment satisfy the following formula: Wherein, n represents the number of first transmission segments, m represents the mth first transmission segment starting from the starting end, α m Represents the phase of the mth first transmission segment starting from the starting end.

2. The low radiation feeding network according to claim 1, characterized in that: At least part of the first transmission section is a straight line.

3. The low radiation feeding network according to claim 2, characterized in that: The transmission line further includes at least one second transmission segment, at least one end of the second transmission segment is connected to at least one of the first transmission segments, the second transmission segment extends along a second direction, and the second direction has an angle with the first direction.

4. The low radiation feeding network according to claim 3, characterized in that: The angle is between 0° and 360°.

5. The low radiation feeding network according to claim 4, characterized in that: At least two of the first transmission segments and the second transmission segments are provided, and the first transmission segments and the second transmission segments are arranged alternately.

6. The low radiation feeding network according to claim 1, characterized in that: At least part of the first transmission segment is an arc.

7. The low-radiation feeder network according to any one of claims 1 to 6, characterized in that: When the number of the first transmission segments is more than two, each of the first transmission segments is formed by bending the transmission line.

8. The low-radiation feeder network according to any one of claims 1 to 7, characterized in that: The number of the first transmission segments is more than two, and the bending directions of two adjacent first transmission segments are opposite.

9. The low-radiation feeder network according to any one of claims 1 to 8, characterized in that: The wavelengths of electromagnetic waves transmitted by each of the first transmission segments are the same.

10. The low-radiation feeder network according to any one of claims 1 to 9, characterized in that: The transmission line is a microstrip line or a parallel double line.

11. An antenna device, characterized in that: It comprises a radiating unit and the low-radiation feeding network according to any one of claims 1 to 10, wherein the low-radiation feeding network is connected to the radiating unit and is used to feed the radiating unit.

12. The antenna device according to claim 11, characterized in that: The low-radiation feeding networks are provided in plurality, the radiating unit comprises at least one antenna element, and the plurality of low-radiation feeding networks are connected to at least one antenna element.

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