Antenna assemblies and communication equipment

Abstract

An antenna assembly and a communication device are provided. The antenna assembly includes: an antenna parallel to a first plane; a reflector parallel to the antenna, the distance between the reflector and the antenna being 0.1 to 0.4 times the wavelength corresponding to the antenna's operating frequency band; and a feeding structure for transmitting radio frequency (RF) signals between an RF port and the antenna, including a first portion located between the antenna and the reflector, the first portion being parallel to a second plane intersecting the first plane; wherein the first portion includes parallel twin lines; at least one capacitor is inserted in the first portion, the at least one capacitor being coupled to the parallel twin lines as inductors to form a resonant circuit, the resonant frequency of the resonant circuit being outside the antenna's operating frequency band. In this application, RF signals are transmitted between the RF port and the antenna through the feeding structure, rather than through a coaxial cable, thereby reducing the need for flying wire structures in the communication device. Furthermore, the feeding structure integrates a filtering structure, which helps to ensure the antenna's directivity.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and in particular to an antenna assembly and a communication device. Background Technology

[0002] Currently, the functions of antennas in communication equipment are becoming increasingly diverse (e.g., beamforming, direction-finding), and the number of antennas is also increasing. To match this change, antennas are increasingly being placed on separate substrates, rather than on the same substrate as the radio frequency (RF) module.

[0003] refer to Figure 1 Antenna 10' and RF module 40' are respectively arranged on substrate 11' and substrate 21'. Since substrate 11' and substrate 21' are spaced apart, the communication device also includes coaxial cable 30', which is used to transmit RF signals between RF module 40' and antenna 10'.

[0004] As the number of antennas increases, communication equipment will contain a large number of flying wire structures (structures formed by coaxial cables running in space). This makes the internal structure of communication equipment relatively messy. Summary of the Invention

[0005] Some embodiments of this application provide an antenna assembly and a communication device. The following describes this application from multiple aspects, and the embodiments and beneficial effects of the following aspects can be referred to each other.

[0006] In a first aspect, this application provides an antenna assembly, comprising: an antenna, wherein the antenna is parallel to a first plane; a reflector, wherein the reflector is parallel to the antenna, and the distance between the reflector and the antenna is 0.1 to 0.4 times the wavelength corresponding to the operating frequency band of the antenna; a feeding structure for transmitting radio frequency signals between a radio frequency port and the antenna, the feeding structure including a first portion located between the antenna and the reflector, the first portion being parallel to a second plane, the second plane intersecting the first plane; wherein the first portion includes parallel twin lines; the first portion includes at least one capacitor, the at least one capacitor being coupled to the parallel twin lines as inductors to form a resonant circuit, the resonant frequency of the resonant circuit being outside the operating frequency band of the antenna.

[0007] According to the embodiments of this application, the radio frequency module and the antenna transmit radio frequency signals through a feeding structure instead of through a coaxial cable, thereby reducing the number of flying wires in the communication equipment. Furthermore, the feeding structure integrates a filtering structure, which helps ensure the directivity of the antenna.

[0008] In some implementations, the first and second transmission lines of the parallel twin lines are coplanar.

[0009] In some embodiments, the parallel double lines include a first segment, a second segment, and a third segment connected in sequence, the second segment extending along a first direction perpendicular to a first plane; the first segment and the third segment bend toward the same side of the second segment relative to the second segment, and the first segment and the second segment are arranged opposite to each other along the first direction; wherein, at least one capacitor includes the first segment and the third segment.

[0010] In some implementations, both the first and third segments are parallel to the second direction, which is perpendicular to the first direction and parallel to the second plane.

[0011] In some embodiments, the antenna has an unbalanced structure. According to an embodiment of this application, a balun structure can be integrated on the first part of the feeding structure through the slotted bending structure formed by the first, second, and third segments, thereby compensating for the antenna imbalance.

[0012] In some embodiments, the first part further includes a substrate and a conductive plate, both the conductive plate and the parallel double lines being disposed on the substrate; the conductive plate and the parallel double lines are spaced apart along a third direction, the third direction being perpendicular to the second plane; the conductive plate at least partially covers the parallel double lines, and the second capacitor in at least one capacitor includes the conductive plate and the portion of the parallel double lines covered by the conductive plate.

[0013] In some embodiments, the antenna has an unbalanced structure; the area of ​​the first transmission line covered by the conductive plate is different from the area of ​​the second transmission line covered by the conductive plate. According to embodiments of this application, a balun structure can be integrated on the first portion of the feeding structure to compensate for the antenna imbalance.

[0014] In some implementations, the conductive plate includes multiple sub-plates.

[0015] In some embodiments, along the first direction, the length of the conductive plate is 0.03 to 0.2 times the wavelength corresponding to the operating frequency band of the antenna, and the spacing between the first segment and the third segment is 0.05 to 0.2 times the wavelength; along the second direction, the lengths of the first segment and the third segment are both 0.03 to 0.18 times the wavelength corresponding to the operating frequency band of the antenna, and the length of the conductive plate is 0.03 to 0.2 times the wavelength.

[0016] In some implementations, the antenna includes a vertically polarized vibrator.

[0017] In some implementations, the second plane is perpendicular to the first plane.

[0018] In some embodiments, the power supply structure further includes a second portion that is parallel to the first plane.

[0019] Secondly, this application provides a communication device, including a radio frequency module and an antenna assembly provided in any embodiment of the first aspect of this application, wherein the radio frequency port of the radio frequency module is connected to the feeding structure of the antenna assembly. The beneficial effects achievable in this second aspect can be referred to in the context of the beneficial effects of any embodiment of the first aspect of this application, and will not be repeated here. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the antenna structure in some implementation methods;

[0021] Figure 2 This application illustrates exemplary application scenarios of the communication device provided in the embodiments of this application;

[0022] Figure 3 This is an exemplary structural diagram of the antenna assembly provided in the embodiments of this application;

[0023] Figure 4A This is an exemplary configuration of the radio frequency module and reflector provided in the embodiments of this application;

[0024] Figure 4B Another exemplary configuration of the radio frequency module and reflector provided in the embodiments of this application.

[0025] Figure 5 This is an exemplary structural diagram of the radiating unit provided in the embodiments of this application;

[0026] Figure 6 This is an exemplary configuration method for the antenna provided in the embodiments of this application;

[0027] Figure 7 This is an exemplary structural diagram of the radiating unit provided in the embodiments of this application;

[0028] Figure 8 This is a schematic diagram showing the positional relationship between the antenna and the reflector provided in an embodiment of this application;

[0029] Figure 9 This is an exemplary structural diagram of the power supply structure in some embodiments;

[0030] Figure 10 This is an exemplary structural diagram of the power supply structure provided in the embodiments of this application;

[0031] Figure 11 This is an exemplary arrangement of the power supply structure on the power supply substrate provided in the embodiments of this application;

[0032] Figure 12 This is a schematic diagram of the equivalent circuit of the power supply structure provided in the embodiments of this application;

[0033] Figure 13 An exemplary structure of the power supply structure provided in the embodiments of this application Figure 2 ;

[0034] Figure 14 An exemplary structure of the power supply structure provided in the embodiments of this application Figure 3 ;

[0035] Figure 15 This is a simulation diagram of isolation provided for an embodiment of this application;

[0036] Figure 16 An exemplary structural diagram four is provided for the power supply structure in the embodiments of this application;

[0037] Figure 17 An exemplary structure of the power supply structure provided in the embodiments of this application Figure 5 ;

[0038] Figure 18 An exemplary structure of the power supply structure provided in the embodiments of this application Figure 6 . Detailed Implementation

[0039] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0040] This application provides an antenna assembly and a communication device including the antenna assembly. In this embodiment, radio frequency signals are transmitted between the radio frequency port and the antenna via a feeding structure, rather than via a coaxial cable, thereby reducing the number of flying wires in the communication device. Furthermore, a filtering structure is integrated into the feeding structure, which helps ensure the directivity of the antenna. A detailed description follows.

[0041] Figure 2 This illustration demonstrates an exemplary application scenario of the communication device 100 provided in this embodiment. In this embodiment, the communication device 100 is an access point (AP) device in a wireless local area network (WLAN), such as a wireless router installed indoors. The communication device 100 can be installed in any location indoors. For example, in... Figure 2 In this embodiment, the communication device 100 is placed on the surface of furniture (e.g., a table). In other embodiments, the communication device 100 may be fixed to a wall or ceiling.

[0042] The communication device 100 includes an antenna and a radio frequency module (RF module, also known as a "radio frequency circuit") that provides radio frequency signals to the antenna, enabling the communication device 100 to have wireless signal transmission and reception capabilities. This allows other terminal devices (e.g., mobile phones, tablets, laptops, etc.) to interact with the communication device 100. In other embodiments, the communication device 100 can be a cellular network device, microwave device, satellite navigation device, etc.; this application is not limited to these, as long as they possess wireless communication capabilities.

[0043] The antenna in the communication device 100 has a set operating frequency band to meet the wireless communication requirements of the communication device 100. For example, for a WLAN device, the operating frequency band of the antenna can be the WLAN communication frequency band. In this document, λ is the wavelength corresponding to the antenna's operating frequency band (referred to as "operating wavelength"). The operating wavelength can be the wavelength of an electromagnetic wave in a medium or the wavelength of an electromagnetic wave in free space.

[0044] Figure 3 An exemplary structural diagram of the antenna assembly 1 and the radio frequency module 40 in the communication device 100 is shown. In the figures herein, the x-direction is the height direction of the antenna assembly 1 (hereinafter referred to as the "height direction", as the first direction), and the y-direction is the width direction of the antenna assembly 1 (hereinafter referred to as the "width direction", as the second direction).

[0045] In addition, the directional terms such as "up," "down," "left," "right," "top," and "bottom" in this article are all based on Figure 3 The orientation of the antenna assembly 1 shown is exemplary and does not indicate or imply that the component must have a specific orientation, which may vary depending on actual use and should not be construed as a limitation of this application.

[0046] refer to Figure 3 The communication device 100 includes an antenna assembly 1 and a radio frequency (RF) module 40. The antenna assembly 1 includes an antenna 10, a reflector 20, and a feeding structure 30. The RF module 40 generates RF signals and has an RF port 41 for outputting RF signals. The feeding structure 32 transmits RF signals between the RF port 41 and the antenna 10. After receiving the RF signal, the antenna 10 radiates electromagnetic waves corresponding to the RF signal. The reflector 20 reflects the electromagnetic waves radiated by the antenna 10 to improve the directivity of the antenna 1.

[0047] The antenna assembly also includes an antenna substrate 11, a reflector substrate 21, and a feed substrate 31. The antenna 10 is disposed on the antenna substrate 11; the radio frequency module 22 and the reflector 20 are disposed on the reflector substrate 21; a portion 32 of the feed structure 30 (as the first part of the feed structure 30) is disposed on the feed substrate 31, and another portion 36 (as the second part of the feed structure 30) is disposed on the reflector substrate 21 (described in detail below).

[0048] In this embodiment, by providing the antenna substrate 11, the reflector substrate 21, and the feed substrate 31, stable support can be provided for the antenna 10, the reflector 20, and the feed structure 30. However, this application is not limited to this. In other embodiments, the antenna substrate 11, the reflector substrate 21, and / or the feed substrate 31 may not be provided. Instead, other structures (e.g., brackets) may be used to provide support for the antenna 10, the reflector 20, and / or the feed structure 30.

[0049] In the following text, based on Figure 3 In the display orientation, the main surface that can be observed on each substrate is called the "front" of the substrate, and the opposite side is called the "back" of the substrate. That is, surface 11a, surface 21a, and surface 31a are the front sides of antenna substrate 11, reflector substrate 21, and feed substrate 31, respectively.

[0050] The structure of each part will be described separately below.

[0051] Figure 4A An exemplary arrangement of the reflector 20 and the radio frequency module 40 is shown. (Reference) Figure 3 and Figure 4A The reflector 20 is parallel to plane P1 (serving as the first plane), which is perpendicular to the height direction. The reflector 20 is disposed on the back side 21b of the reflector substrate 21. The reflector 20 is made of metal, and when the electromagnetic waves radiated by the antenna 10 reach the reflector 20, the reflector 20 can reflect the electromagnetic waves upwards. The electromagnetic waves reflected by the reflector 20 are called "reflected waves." The reflected waves and the electromagnetic waves radiated by the antenna 10 superimpose, increasing the energy of the electromagnetic waves in space. In other words, by setting the reflector 20, the directivity of the antenna 10 can be enhanced. Furthermore, the reflector 20 can also shield interference signals from below it.

[0052] The radio frequency (RF) module 40 is disposed on the front side 21a of the reflector substrate 21. The RF module 40 has an RF port 41, through which it transmits RF signals. Specifically, the RF port 41 is connected to the feed structure 30 (…). Figure 4A (The dashed part) is connected to transmit radio frequency signals to the antenna 10 through the feeding structure 30.

[0053] In this embodiment, the reflector 20 also serves as the ground plane of the radio frequency module 40. Therefore, in this embodiment, the reflector 20 can also be referred to as the "Ground (GND) 20". In Figure 4, the radio frequency module 40 and the ground 20 are respectively disposed on opposite sides of the reflector substrate 21, but this application is not limited thereto. In other embodiments, the radio frequency module 40 may be at least partially disposed on the same surface as the ground 20. For example, part of the circuitry of the radio frequency module 40 and the ground 20 may both be disposed on the front side 21a of the reflector substrate 21.

[0054] In addition, in this embodiment, the radio frequency module 40 and the reflector 20 are disposed on the same substrate (i.e., reflector substrate 21) to simplify the structure of the communication device 100. However, this application is not limited to this. For example, refer to Figure 4B (For ease of observation, Figure 4B In one embodiment (with part of the reflector 20 removed), the radio frequency module 40 is located below the reflector 20 and is disposed on the radio frequency substrate 41. In this embodiment, a portion 32 of the feeding structure 30 is located between the reflector 36 and the antenna 10, and another portion 36 is located below the reflector 20.

[0055] Figures 5-7 An exemplary structure of antenna 10 is shown. (Reference) Figures 5-7 and combined Figure 3 Antenna 10 is parallel to reflector 20 (i.e., parallel to plane P1), and antenna 10 and reflector 20 are spaced apart along the height direction. Antenna 10 is used to receive and / or transmit electromagnetic wave signals. Typically, antenna 10 has a defined shape and size so that the electromagnetic wave energy it radiates is concentrated in a specific direction. In the field of antennas, "directivity" refers to the degree of concentration of the antenna's radiated energy. The better the antenna's directivity, the higher the degree of concentration of the antenna's radiated energy.

[0056] This embodiment does not limit the specific structure of antenna 10. For example, antenna 10 can be implemented as a dipole antenna, slot antenna, dielectric resonator antenna, etc. Antenna 10 may include a plurality of (e.g., 1, 4, 6, 10, etc.) radiating elements. The number of radiating elements can be one or more. When the number of radiating elements is multiple, the multiple radiating elements can be arranged in an array (e.g., rectangular array, ring array, etc.). In addition, each radiating element can be a horizontally polarized element or a vertically polarized element. The exemplary structure of antenna 10 provided in this embodiment is described below.

[0057] Figure 5 A schematic diagram of the structure of the radiating element 12 in the antenna 10 provided in this embodiment is shown. Figure 6 The arrangement of antenna 10 on antenna substrate 11 is shown, wherein, Figure 6(a) is a front view of the antenna substrate 11. Figure 6 (b) is a rear view of the antenna substrate 11.

[0058] refer to Figure 5 The antenna 10 includes four identical dipole elements 121 (as an example of a radiating element), which are evenly arranged along a circumference L (i.e., arranged in a circular array). Each dipole element 121 includes two radiating arms, namely radiating arm 121a and radiating arm 121b. Multiple dipole elements 121 together form a windmill-like shape; therefore, the antenna 10 provided in this embodiment is also called a "windmill antenna." (Refer to...) Figure 6 (a) The radiating arm 121a is located on the front side 11a of the antenna substrate 11; Reference Figure 6 (b) The radiating arm 121b is located on the back side 11b of the antenna substrate 11.

[0059] Continue to refer to Figure 6 (a) A pad 14 is provided on the front side 11a of the antenna substrate 11, and each radiating arm 121a is connected to the pad 14 via a connecting line 13. A via 15 is provided at the center of the antenna substrate 11, and a conductor 16 is provided in the via 15. The pad 14 is connected to the pad 17 on the back side 11b of the antenna substrate 11 via the conductor 16. (See reference) Figure 6 (b) A feed point 17a is provided on the pad 17, and the feed point 17a is connected to the feed structure 30 (e.g., soldered).

[0060] Continue to refer to Figure 6 (b) The back surface 11b of the antenna substrate 11 is also provided with pads 18, which are spaced apart from pads 17 (with a gap V between them) to achieve mutual insulation. The radiating arms 121b of each dipole unit 121 are connected to the pads 18 via connecting lines 19. Feed points 18a are provided on the pads 18, and the feed points 18a are connected to the feed structure 30 (e.g., by soldering).

[0061] By adjusting the structural dimensions of the dipole element 121, the antenna 10 can be made to operate within a specified frequency band. (Reference) Figure 5 The length A1 of the dipole unit 121 is λ / 4 to λ / 2, and the spacing A2 between the dipole units 121 is λ / 3 to 2λ / 3. Additionally, the diameter of the pad 18 is λ / 4 to 2λ / 3.

[0062] In this embodiment, the antenna 10 operates in the WLAN communication band. However, this application is not limited to this. In other embodiments, the antenna 10 may operate in other frequency bands, such as cellular network communication bands (e.g., LTE / 5G communication bands), microwave bands, GPS communication bands, etc.

[0063] In this embodiment, the radiating arm 121a, connecting line 13, pad 14, conductor 16, and pad 17 together form the first part of the antenna 10 (this part is fed by feed point 17a), and the radiating arm 121b, connecting line 19, and pad 18 together form the second part of the antenna 10 (this part is fed by feed point 18a). Because the structures of the first and second parts of the antenna 10 are different, the antenna 10 provided in this embodiment is an unbalanced structure. In other embodiments, the antenna 10 can also be a balanced structure.

[0064] It should be noted that, Figure 5 The dipole unit 121 shown is an exemplary structure of the radiating unit, and the radiating unit can be any other structure. Figure 7 Several other structures for the radiating element are shown. Among them, Figure 7 (a) Figure 7 (b) shows a radiating element that is a dipole element. Figure 7 (c)~ Figure 7 The radiating element shown in (g) is a monopole element.

[0065] The following describes the configuration of the power supply structure 30. (Reference) Figure 3 As described above, the power feeding structure 30 includes two parts: a part 32 (as the "first part" of the power feeding structure 30) is disposed on the power feeding substrate 31, and the other part 36 (as the second part of the power feeding structure 30) is disposed on the reflector substrate 21.

[0066] The feed section 32 is located between the antenna 10 and the reflector 20, and is parallel to the second plane P2 (which serves as the second plane). In this embodiment, the angle between plane P2 and plane P1 is 90° (i.e., plane P2 is perpendicular to plane P1). In other embodiments, the angle between plane P2 and plane P1 can be other angles (e.g., 60°, 75°, etc.), as long as plane P2 intersects plane P1.

[0067] The power supply section 36 is used to connect the RF port 41 and the power supply section 32; that is, one end of the power supply section 36 is connected to the RF port 41, and the other end is connected to the power supply section 32. In this embodiment, the power supply section 36 is parallel to the plane P1. Specifically, the power supply section 36 is a transmission line disposed on the reflector substrate 21. In other embodiments, the power supply section 36 may also adopt other configurations. For example, refer to... Figure 4B The power supply section 36 includes a vertical section 361 and a horizontal section 362 located below the reflector 20.

[0068] In other words, in this embodiment, the radio frequency signal is transmitted between the radio frequency module 40 and the antenna 10 through the feeding structure 20, instead of through the coaxial line, which reduces the flying wire structure in the antenna assembly 1.

[0069] Additionally, in coaxial cable connections (e.g., Figure 1 As shown in the diagram, coaxial lines may cross and interfere with each other, affecting antenna performance. In this embodiment, the feeding portion 32 of the feeding structure 30 is disposed on the feeding substrate 31 and has a fixed routing path, thus avoiding crossover and interference between radio frequency signal transmission lines and helping to ensure antenna performance.

[0070] Furthermore, since the power feeding portion 32 is disposed on the power feeding substrate 31, the power feeding portion 32 can be formed by etching or depositing conductive material on the power feeding substrate 31. That is, the power feeding portion 32 can be fabricated using a mechanized etching / deposition process. Compared to Figure 1 The method shown in this embodiment, in which the coaxial cable 30' is manually soldered between the antenna 10' and the RF module 40', can simplify the manufacturing process of the antenna assembly.

[0071] Based on this, this embodiment does not limit the material of the feed substrate 31. The feed substrate 31 can be a plastic substrate, a rigid printed circuit board (PCB) substrate (e.g., a glass fiber filled epoxy resin substrate), a flexible printed circuit (FPC) substrate (e.g., a polyimide substrate), etc. The materials of the antenna substrate 11 and the reflector substrate 21 can refer to the material of the feed substrate 31, and will not be described in detail.

[0072] This embodiment does not limit the material of the feed section 32. The material of the feed section 32 can be copper, aluminum, stainless steel, brass and their alloys, silver-plated copper, silver-plated copper foil on an insulating substrate, silver foil and tin-plated copper on an insulating substrate, cloth impregnated with graphite powder, graphite-coated substrate, copper-plated substrate, brass-plated substrate, and aluminum-plated substrate, etc. The material of the antenna 10 can refer to the material of the feed section 32, and will not be described in detail.

[0073] As stated above, antenna 10 and reflector 20 are parallel to each other (both parallel to plane P1). (Reference) Figure 8A distance H is provided between the reflector 20 and the antenna 10. H is 0.1λ to 0.4λ, for example, H is 0.1λ, 0.25λ, or 0.4λ. Here, λ can be the wavelength of the electromagnetic wave radiated by the antenna 10 in free space. When the distance H is too small (e.g., H is less than 0.1λ), the reflector 20 will have an undesirable effect on the antenna 10 (e.g., the reflector 20 will generate coupling capacitance on the antenna 10, thus affecting the impedance matching of the antenna 10); when the distance H is too large (e.g., H is greater than 0.4λ), it will increase the volume of the antenna assembly 1, which is not conducive to the arrangement of the antenna assembly 1 in the communication device 100. Therefore, in this embodiment, H is set to 0.1λ to 0.4λ to balance the performance of the antenna 10 and the installation space requirements of the antenna assembly 1.

[0074] For example, refer to Figure 8 Antenna 10 is arranged on both sides of antenna substrate 11, and the spacing H can be the distance from reflector 20 to the center plane P of antenna substrate 11. In other embodiments, when antenna 10 is arranged on one side of antenna substrate 11, the spacing H can be the distance between reflector 20 and that surface of antenna substrate 11. For example, when all radiating elements 12 are located on the front side 11a of antenna substrate 11, the spacing H is the distance between reflector 20 and the front side 11a of antenna substrate 11.

[0075] When the distance H between the reflector 20 and the antenna 10 is 0.1λ to 0.4λ, the height of the feed section 32 (the dimension of the feed section 32 along the height direction) is also approximately 0.1λ to 0.4λ. In this case, the feed section 32 may affect the performance of the antenna 10.

[0076] For example, when the power supply section 32' is set to Figure 9 In the structure shown (where the feed section 32' is formed by parallel double lines 33' extending along a straight line), the resonant frequency of the feed section 32' is located within the operating frequency band of the antenna 10. The feed section 32' can be considered as a line reflector, reflecting the electromagnetic waves radiated by the antenna 10. The spatial distribution of the reflected electromagnetic waves is similar to the spatial distribution of the electromagnetic waves radiated by a monopole antenna. The electromagnetic waves reflected by the feed section 32' superimpose with the electromagnetic waves radiated by the antenna 10 itself, altering the distribution of the electromagnetic field in space and thus changing the directivity of the antenna 10. Especially when the antenna 10 is a vertically polarized antenna, its electric field direction is parallel to the height direction, and the influence of the feed section 32' on the directivity of the antenna 10 will be more significant.

[0077] Therefore, in this embodiment, the power supply section 32 also integrates a filtering structure to ensure the directivity of the antenna 10. Figure 10 A structural diagram of the power supply section 32 provided in this embodiment is shown. Figure 11 The arrangement of the power supply section 32 on the power supply substrate 31 is shown, wherein, Figure 11 (a) is a front view of the power supply substrate 31. Figure 11 (b) is a rear view of the power supply substrate 31.

[0078] refer to Figure 10 and Figure 11 The power supply section 32 includes a double paralle strip line 33 and a conductive plate 34 (shown in dashed outlines; the material is, for example, metal). Reference Figure 11 (a) Parallel double lines 33 are disposed on the front side of the feed substrate 31 (e.g., Figure 11 (a) As shown, the conductive plate 34 is disposed on the back side of the feed substrate 31 (as shown in the figure). Figure 11 (b) is shown.

[0079] The parallel dual-line 33 includes two strip-shaped transmission lines (transmission line 331 and transmission line 332) with parallel routing paths. The spacing between the two transmission lines is much smaller than the operating wavelength of the antenna 10, so that electromagnetic waves can be confined between the two transmission lines and propagate along their routing paths. In this embodiment, transmission line 331 (as the first transmission line) and transmission line 332 (as the second transmission line) are coplanar. Specifically, both transmission line 331 and transmission line 332 are located on the front side 31a of the feed substrate 31.

[0080] Specifically, the lower end of transmission line 331 of the parallel twin-wire 33 is connected to the feed section 36 (e.g., soldered), and the upper end is connected to the feed point 17a of the antenna 10 (e.g., soldered); the lower end of transmission line 332 is connected to the ground plane (e.g., reflector 20), and the upper end is connected to the feed point 18a of the antenna 10 (e.g., soldered). The radio frequency signal of the radio frequency module 40 can be transmitted to the antenna 10 via the feed section 36 and the parallel twin-wire 33.

[0081] Continue to refer to Figure 10 The parallel double lines 33 extend along a non-linear path. The parallel double lines 33 include a first segment 351, a second segment 353, and a third segment 352 connected sequentially. The second segment 353 extends along the height direction. The first segment 351 and the third segment 352 bend relative to the second segment 353 towards the same side of the second segment 353. Furthermore, the first segment 351 and the third segment 352 are spaced apart relative to each other along the height direction of the antenna assembly 1. Thus, the first segment 351, the second segment 353, and the third segment 352 can form a groove-like bent structure 35 (also referred to as a "groove-shaped bent structure 35"). For ease of understanding, the first segment 351 is referred to as the sidewall 351 of the groove-shaped bent structure 35, the third segment 352 is referred to as the sidewall 352 of the groove-shaped bent structure 35, and the second segment 353 is referred to as the bottom wall 353 of the groove-shaped bent structure 35.

[0082] It should be noted that the aforementioned "first segment 351", "second segment 352" and "third segment 353" are all segments of the overall structure of the parallel double line 351. In other words, "first segment 351", "second segment 352" and "third segment 353" are all formed by two transmission lines (transmission lines 331 and 332), rather than by a single transmission line.

[0083] The meaning of "the base wall 353 extends along the height direction" is that the extension direction of the base wall 353 has at least a component along the height direction. Based on this, the specific extension direction of the base wall 353 is not limited. For example, the extension direction of the base wall 353 can be parallel to the height direction (e.g., ...). Figure 10 (as shown), or it can be at an acute angle to the height direction (e.g., 30°).

[0084] The phrase "the first segment 351 and the third segment 352 are arranged opposite each other along the height direction" means that the first segment 351 and the third segment 352 are spaced apart along the height direction. Furthermore, both the first segment 351 and the third segment 352 extend along the width direction (i.e., the extension directions of both sidewalls 351 and 352 have a component along the width direction), and their projections along the height direction at least partially overlap. The first segment 351 (i.e., sidewall 351) and the third segment 352 (i.e., sidewall 352) are arranged opposite each other along the height direction, thereby forming a capacitor C1 (as a first capacitor). That is, the capacitor C1 includes sidewalls 352 and 353. In this embodiment, sidewalls 351 and 352 are both parallel to the width direction and have equal lengths. The bottom wall 353 is parallel to the height direction, and the inner cavity of the grooved bending structure 35 is rectangular.

[0085] Continue to refer to Figure 10 Parallel double lines 33 and conductive plates 34 are respectively disposed on the front and back sides of the feed substrate 31, that is, the parallel double lines 33 and conductive plates 34 are spaced apart along the thickness direction (as a third direction) of the feed substrate 31. The feed substrate 31 is parallel to plane P2, and the thickness direction of the feed substrate 31 is perpendicular to plane P2. In other embodiments, the conductive plates 34 may not be located on the surface of the feed substrate 31, but rather in the middle layer of the feed substrate 31, as long as the conductive plates 34 and the parallel double lines 33 are spaced apart along the thickness direction of the feed substrate 31.

[0086] Furthermore, the conductive plate 34 at least partially covers the parallel double lines 33, so that the portion of the conductive plate 34 and the parallel double lines 33 covered by the conductive plate 34 can together form a capacitor C2 (as a second capacitor). That is, the capacitor C2 includes the portion of the conductive plate 34 and the parallel double lines 33 covered by the conductive plate 34.

[0087] The meaning of "conductive plate 34 covering parallel double lines 33" is that the projection of conductive plate 34 onto the plane containing parallel double lines 33 (e.g., the front side 31a of the feed substrate 31) at least partially coincides with parallel double lines 33. For example, Figure 10 In the diagram, the portion of the parallel double lines 33 covered by the conductive plate 34 is the shaded area indicated by the diagonal lines.

[0088] The parallel double wire 33 is an inductor, and capacitors C1 and C2 coupled to this inductor can form a circuit M. Circuit M can act as a resonator. In this embodiment, the resonant frequency of this resonator is outside the operating frequency band of antenna 10. That is, the resonant frequency of the resonant circuit M formed by coupling capacitors C1 and C2 with the parallel double wire 33 (which acts as an inductor) is outside the operating frequency band of antenna 10. Generally, the coupling of capacitors and inductors can form an LC resonant circuit. This embodiment utilizes the coupling of the equivalent capacitance and equivalent inductance inherent in the parallel double wire itself to obtain an LC resonant circuit. In addition to capacitors C1 and C2 and the parallel double wire 33 (which acts as an inductor), the resonant circuit M may also include other components, such as equivalent resistance.

[0089] Figure 12 An exemplary configuration of the resonant circuit M is shown. (Reference) Figure 12 and combined Figure 10 The S1 segment of parallel double wire 33 forms an inductor L1, which is connected in parallel with capacitor C1 to form a first LC circuit M1. The two ends of the first LC circuit are connected in series with inductors L2 (formed by the S2 segment of parallel double wire 33) and L3 (formed by the S3 segment of parallel double wire 33), respectively. This series circuit is then connected in parallel with capacitor C2 to form a second LC circuit M2. The two ends of the second LC circuit are connected in series with inductors L4 (formed by the S4 segment of parallel double wire 33) and L5 (formed by the S5 segment of parallel double wire 33), respectively, to form a resonant circuit M.

[0090] Those skilled in the art will understand that the capacitance of each capacitor and the inductance of each inductor can be adjusted by adjusting the shape and size of each component in the power supply section 32. For example, the inductance of inductor L1 can be increased by extending the length of the S1 segment of the parallel double line 33; the capacitance of capacitor C1 can be increased by increasing the length of the opposite sidewalls 351 and 352 (i.e., the overlap length of the projections of sidewalls 351 and 352 along the height direction) or by decreasing the spacing between sidewalls 351 and 352; and the capacitance of capacitor C2 can be increased by increasing the area of ​​the conductive plate 34 covering the parallel double line 33.

[0091] By setting the capacitance values ​​of each capacitor and / or the inductance values ​​of each inductor, the resonant circuit M can have a set frequency characteristic (e.g., a set resonant frequency). In this embodiment, the resonant frequency of the resonant circuit M is set to be outside the operating frequency band of the antenna 10. This reduces the reflection effect of the feed section 32 on the electromagnetic waves radiated by the antenna 10, thereby avoiding any impact on the directivity of the antenna 10. In other words, this embodiment is equivalent to integrating a filter structure into the feed section 32. This filter structure can filter the electromagnetic wave signals radiated from the antenna 10 to the feed section 32, preventing the reflected electromagnetic waves from superimposing with the electromagnetic waves radiated by the antenna 10 itself, thus ensuring the directivity of the antenna 10.

[0092] For example, refer to Figure 10 The height B1 of the groove-shaped bent structure 35 (i.e., the distance between sidewalls 351 and 352 along the height direction) is 0.05λ to 0.2λ, and the width B2 (i.e., the length of sidewall 351 or 352 along the width direction) is 0.03λ to 0.18λ. The height B3 of the conductive plate 34 is 0.03λ to 0.2λ, the width B4 is 0.03λ to 0.2λ, the distance B5 between the conductive plate 34 and the bottom end of the parallel double line 33 is 0.1λ to 0.3λ, and the distance B6 between the left side of the conductive plate 34 and the parallel double line 33 is 0 to 0.1λ. At this time, the resonant frequency of the resonant circuit M is set to be outside the operating frequency band of the antenna 10. Here, λ can be the wavelength of the electromagnetic wave in the medium (specifically, the radio frequency substrate 31).

[0093] In this embodiment, the capacitors in the power supply section 32 include capacitor C1 and capacitor C2. Capacitors C1 and C2 are coupled to the inductor of the parallel double line 33 to form a filter structure. Using two capacitors improves the flexibility of circuit adjustment. However, this application is not limited to this. In some embodiments, the power supply section 32 may not include capacitor C1 (i.e., the parallel double line 33 does not have a slotted bending structure 35, such as...). Figure 13 As shown), a filter structure is formed by adjusting the values ​​of capacitor C2 and each inductor. Similarly, in some other embodiments, capacitor C2 may not be included in the power supply section 32 (for example, conductive plate 34 is not provided in the power supply section 32), and a filter structure is formed by adjusting the values ​​of capacitor C1 and each inductor.

[0094] refer to Figure 9 As the number of antennas in communication equipment increases, other antennas (referred to herein as "adjacent antennas 2") are often arranged around antenna 10. Antenna 10 and adjacent antenna 2 typically operate in the same frequency band. In some cases, antenna 10 has an unbalanced structure (e.g., Figure 6 Antenna 10 shown). At this time, if the feed section 32' is set to Figure 9The symmetrical structure shown (i.e., transmission lines 331' and 332' have the same structure) results in an unbalanced signal transmission line between the RF module 22 and the radiating unit 12. Specifically, the impedance of the transmission line connecting the RF port 221 and the radiating arm 121a is different from the impedance of the transmission line connecting the reflector 20 and the radiating arm 121b. When the signal transmission line is unbalanced, the isolation between the antenna 10 and the adjacent antenna 2 is affected.

[0095] Therefore, a balun structure can also be integrated on the feed section 32 provided in this embodiment to improve the isolation between the antenna 10 and the adjacent antenna 2. Specifically, the circuits formed by transmission lines 331 and 332 have different impedances, thereby forming a balun structure. (See reference...) Figure 11 Since the slot-shaped bent structure 35 is formed by bending parallel double lines 33, its slot wall has a double-layer structure. The inner layer structure of the slot wall is formed by bending transmission line 331, and the outer layer structure is formed by bending transmission line 332. There is a gap D11 between the two sidewalls of the inner layer structure (i.e., sidewalls 331a and 331b), so sidewalls 331a and 331b form a capacitor C11; while there is a conductor between the two sidewalls of the outer layer structure (i.e., sidewalls 332a and 332b) (specifically sidewalls 331a and 331b), so sidewalls 332a and 332b do not form a capacitor. Thus, the capacitance value of the circuit formed by transmission line 331 is different from the capacitance value of the circuit formed by transmission line 332, that is, the circuit formed by transmission line 331 and the circuit formed by transmission line 332 have different impedances. Thus, the feed section 32 is also an unbalanced structure, which can compensate for the imbalance of the antenna 10. That is, in this embodiment, by setting the groove-shaped bending structure 35, a balun structure (referred to as balun structure A) can be integrated on the power supply part 32.

[0096] However, this application is not limited thereto. For example, in another embodiment, reference is made to... Figure 14 The area S1 of the conductive plate 34 covering the transmission line 331 is different from the area S2 of the conductive plate 34 covering the transmission line 332 (the difference between the two is ΔS). Therefore, the capacitance value of the capacitor C21 formed by the conductive plate 34 and the transmission line 331 is different from the capacitance value of the capacitor C22 formed by the conductive plate 34 and the transmission line 332. Thus, the circuit formed by the transmission line 331 and the circuit formed by the transmission line 332 have different impedances. Therefore, the feed section 32 can also compensate for the imbalance of the antenna 10. That is, in this embodiment, a balun structure (referred to as balun structure B) can also be integrated on the feed section 32 through the area difference ΔS. In other embodiments, the feed section 32 can simultaneously include balun structure A and balun structure B.

[0097] Figure 15A comparison chart of the isolation between different tested antennas (referred to as antenna a, antenna b, and antenna c) and adjacent antennas is presented. The adjacent antennas are vertically polarized antennas and operate in the same frequency band as the tested antenna. The spacing between the adjacent antennas and the tested antenna is 50 mm. Figure 15 In (a), the radio frequency module directly feeds antenna a; Figure 15 In (b), the radio frequency module is via, as shown in... Figure 9 The feeding structure 32' shown feeds antenna b; Figure 15 In (c), the radio frequency module is accessed via, for example... Figure 10 The shown feeding structure 30 feeds the antennas. Apart from this, the other structures of antennas a, b, and c are identical; for example, antennas a, b, and c are all... Figure 5 Antenna 10 is shown in the image.

[0098] Figure 15 (a) Figure 15 (b) Figure 15 (c) Schematic diagrams of the S21 parameters between antennas a, b, and c and their adjacent antennas are shown respectively. In each diagram, the horizontal axis represents the operating frequency of the antenna (unit: GHz), and the vertical axis represents the value of the S21 parameter (unit: dB). In the field of antennas, the S21 parameter characterizes the isolation between two antennas; the smaller the value of the S21 parameter, the less mutual interference between the two antennas, and the better the isolation. Reference Figure 15 (a) The minimum isolation between antenna a and its adjacent antenna is -27 dB; Reference Figure 15 (b) The minimum isolation between antenna b and its adjacent antenna is -21 dB; Reference Figure 15 (c) The minimum isolation between antenna c and adjacent antennas is -31dB. In other words, by integrating a balun structure on the feed section 32, the isolation between the antenna and adjacent antennas can be significantly improved.

[0099] The feeding section 32 provided in this embodiment has been described above. By integrating a filter structure and a balun structure on the feeding section 32, this embodiment helps to ensure the isolation and directivity of the antenna 10.

[0100] It is understood that the power supply section provided in this embodiment is an exemplary description of the technical solution of this application, and those skilled in the art can make other modifications.

[0101] For example, in this embodiment, sidewalls 351 and 352 both extend along the width direction and have equal lengths, so that the parallel double lines 33 have a simple structure. However, this application is not limited to this. For example, refer to Figure 16 (a) In another embodiment, sidewalls 351 and 352 have different lengths; see reference Figure 16(b) The sidewall 351 of the groove-shaped bending structure 35 extends obliquely downward from left to right, and the sidewall 352 of the groove-shaped bending structure 35 extends obliquely upward from left to right.

[0102] For example, in this embodiment, there is one slotted bending structure 35 to simplify the routing of the parallel double lines 33 on the feed substrate 31. In other embodiments, there may be multiple slotted bending structures 35. For example, refer to... Figure 17 Two groove-shaped bending structures 35 are formed on the parallel double lines 33 to form two capacitors C1;

[0103] For example, in this embodiment, the conductive plate 34 is rectangular in shape, and there is only one conductive plate 34. In other embodiments, the conductive plate 34 may include one or more (e.g., two or four) sub-plates, and the shape of each sub-plate may be triangular, rectangular, circular, elliptical, trapezoidal, I-shaped, annular, polygonal, or irregular, etc., which is not limited in this application. For example, refer to Figure 18 (a) In some embodiments, the conductive plate 34 includes two rectangular sub-plates; see reference. Figure 18 (b) In some embodiments, the conductive plate 34 is a hollow rectangle; see reference. Figure 18 (c) In some embodiments, the conductive plate 34 is I-shaped.

[0104] In the above description of this embodiment, unless otherwise stated, " / " means "or". For example, A / B can identify A or B. The "and / or" in this document is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, B exists alone, and A and B exist simultaneously.

Claims

1. An antenna assembly, characterized in that, include: An antenna, wherein the antenna is parallel to the first plane; A reflector, wherein the reflector is parallel to the antenna, and the distance between the reflector and the antenna is 0.1 to 0.4 times the wavelength corresponding to the operating frequency band of the antenna; A feeding structure for transmitting radio frequency signals between a radio frequency port and an antenna, the feeding structure including a first portion located between the antenna and the reflector, the first portion being parallel to a second plane, the second plane intersecting the first plane; wherein, the first portion includes parallel double lines; The first part includes at least one capacitor, which is coupled to the parallel biwire as an inductor to form a resonant circuit, the resonant frequency of which is outside the operating frequency band of the antenna; The parallel double lines include a first segment, a second segment, and a third segment connected in sequence, with the second segment extending along a first direction, which is perpendicular to a first plane; The first segment and the third segment are respectively bent toward the same side of the second segment relative to the second segment, and the first segment and the third segment are arranged opposite to each other along the first direction; The at least one capacitor includes a first capacitor, which includes the first segment and the third segment.

2. The antenna assembly according to claim 1, characterized in that, The first and second transmission lines of the parallel double lines are located in the same plane.

3. The antenna assembly according to claim 1, characterized in that, Both the first and third segments are parallel to the second direction, which is perpendicular to the first direction and parallel to the second plane.

4. The antenna assembly according to claim 1 or 3, characterized in that, The antenna has an unbalanced structure.

5. The antenna assembly according to claim 1, characterized in that, The first part further includes a substrate and a conductive plate, wherein the conductive plate and the parallel double lines are both disposed on the substrate; the conductive plate and the parallel double lines are spaced apart along a third direction, and the third direction is perpendicular to the second plane; The conductive plate at least partially covers the parallel double lines, and the at least one capacitor includes a second capacitor, which includes the conductive plate and the portion of the parallel double lines covered by the conductive plate.

6. The antenna assembly according to claim 5, characterized in that, The antenna has an unbalanced structure; The area of ​​the first transmission line covered by the conductive plate is different from the area of ​​the second transmission line covered by the conductive plate.

7. The antenna assembly according to claim 5 or 6, characterized in that, The conductive plate comprises multiple sub-plates.

8. The antenna assembly according to claim 5, characterized in that, Along the first direction, the length of the conductive plate is 0.03 to 0.2 times the wavelength corresponding to the operating frequency band of the antenna, and the spacing between the first segment and the third segment is 0.05 to 0.2 times the wavelength; Along the second direction, the lengths of the first segment and the third segment are both 0.03 to 0.18 times the wavelength corresponding to the operating frequency band of the antenna, and the length of the conductive plate is 0.03 to 0.2 times the wavelength. The second direction is perpendicular to the first direction and parallel to the second plane.

9. The antenna assembly according to claim 1, characterized in that, The antenna includes a vertically polarized vibrator.

10. The antenna assembly according to claim 1, characterized in that, The second plane is perpendicular to the first plane.

11. The antenna assembly according to claim 1, characterized in that, The power supply structure further includes a second part, which is parallel to the first plane.

12. A communication device, characterized in that, It includes a radio frequency module and an antenna assembly as described in any one of claims 1 to 11, wherein the radio frequency port of the radio frequency module is connected to the feeding structure of the antenna assembly.

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