WO2020216372A1

WO2020216372A1 - Quasi-yagi antenna array and millimeter wave base station apparatus

Info

Publication number: WO2020216372A1
Application number: PCT/CN2020/086874
Authority: WO
Inventors: 王世华; 丁屹; 邓超平; 刘志勇
Original assignee: 大唐移动通信设备有限公司
Priority date: 2019-04-25
Filing date: 2020-04-24
Publication date: 2020-10-29
Also published as: CN111864407A; CN111864407B

Abstract

Provided in the present invention are a quasi-Yagi antenna array and a millimeter wave base station apparatus. The quasi-Yagi antenna array comprises at least two radio frequency boards stacked and spaced apart from each other, wherein each radio frequency board has at least one radio frequency channel, and at least two quasi-Yagi antenna units arranged in an array, and each radio frequency channel corresponds to at least one quasi-Yagi antenna unit. Each quasi-Yagi antenna unit comprises a balun structure electrically connected to a radio frequency channel of the at least one radio frequency channel, an active array electrically connected to the balun structure, and at least one passive array located on one side of the active array and away from the balun structure. A working bandwidth of the quasi-Yagi antenna array is expanded by means of forming the quasi-Yagi antenna array in a stacked manner and in an array, which facilitates the integration of an antenna and the radio frequency boards, reduces the size of a base station apparatus, improves antenna gain of the quasi-Yagi antenna array and reduces transmission loss. A broadband characteristic of the quasi-Yagi antenna unit is realized by adding the balun structure to realize the conversion from unbalance to balance.

Description

Quasi-Yagi antenna array and millimeter wave base station equipment

Cross references to related applications

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201910337785.4, and the application name is "a quasi-yagi antenna array and millimeter wave base station equipment" on April 25, 2019, the entire content of which is incorporated by reference In this application.

Technical field

The present invention relates to the field of communication technology, in particular to a quasi-Yagi antenna array and millimeter wave base station equipment.

Background technique

The 5G mobile communication system is a network with wide coverage, high capacity, multiple connections, low latency and high reliability. The millimeter wave frequency band, as the carrying frequency band of 5G peak traffic, is an important part of the 5G spectrum strategy. The 5G millimeter wave communication system is mainly oriented to large-bandwidth and high-capacity applications, and its application scenarios cover large stadiums, shopping malls, airplanes, railway stations and other hot spots. The 5G millimeter wave experimental frequency band released by the Ministry of Industry and Information Technology of my country is 24.25-27.5GHz and the bandwidth is 3.25GHz. If millimeter wave base station equipment uses a single antenna to cover all of my country's 5G high-frequency experimental frequency bands, it is difficult to meet the bandwidth requirements.

Summary of the invention

The present invention provides a quasi-yagi antenna array and millimeter wave base station equipment to increase the bandwidth of the antenna.

In a first aspect, the present invention provides a quasi-Yagi antenna array. The quasi-Yagi antenna array includes at least two radio frequency boards stacked and spaced apart. Each radio frequency board is provided with at least one radio frequency channel and at least two Quasi-Yagi antenna unit, wherein each radio frequency channel corresponds to at least one quasi-Yagi antenna unit. Each quasi-Yagi antenna unit includes a balun structure electrically connected to the corresponding radio frequency channel, an active element electrically connected to the balun structure, and at least one passive element located on the side of the active element and away from the balun structure.

In the above technical solution, at least one radio frequency channel and at least two quasi-Yagi antennas that are electrically connected to the at least one radio frequency channel and arranged in an array are provided on each of the at least two radio frequency boards that are stacked and spaced apart. Unit, thereby expanding the working bandwidth of the quasi-Yagi antenna array. With the above-mentioned setting method, there is no need to adopt a stacked design method, which facilitates the integration of the antenna and the radio frequency board, thereby reducing the size of the base station equipment. By integrating multiple quasi-Yagi antenna units arranged in an array on the radio frequency board, the antenna gain and receiving sensitivity of the quasi-Yagi antenna array can be improved, and there is no need to use radio frequency connectors to connect radio frequency cables and antennas, thereby reducing transmission loss. By adding a balun structure to the quasi-Yagi antenna unit to achieve unbalanced to balanced conversion, the broadband characteristics of the quasi-Yagi antenna unit are realized.

In a specific embodiment, the balun structure includes an impedance matching section electrically connected to the corresponding radio frequency channel and electrically connected to the active array, and a phase shifter electrically connected to the impedance matching section. Through the impedance matching section and the phase shifter, it is convenient to control the phase and amplitude of each quasi-Yagi antenna unit to form a large-scale active array antenna.

In a specific embodiment, the inner edge angle of the phase shifter is 90°, and the outer edge angle of the phase shifter is a 45° cutting angle, so as to ensure relatively uniform propagation of electromagnetic energy, thereby achieving broadband characteristics.

In a specific embodiment, the phase shifter is a broadband 180° phase shifter, and the impedance matching section is a quarter-wavelength impedance matching section at the operating frequency of the quasi-Yagi antenna unit, thereby dividing the signal power transmitted from the radio frequency channel Two channels of equal amplitude and inverted signals are used to feed the active elements.

In a specific embodiment, the length of the passive element is less than the length of the active element, and the length of the passive element is 0.3 to 0.5 wavelength at the operating frequency of the quasi-Yagi antenna unit. And the distance between the active element and the passive element closest to the active element is 0.15～0.25 wavelength under the working frequency of the quasi-Yagi antenna unit. In one embodiment, the length of the passive element is 0.4 wavelength under the working frequency of the quasi-Yagi antenna unit, and the distance between the active element and the passive element closest to the active element is the working frequency of the quasi-Yagi antenna unit 0.2 wavelength, so that the radiation direction of the quasi-Yagi antenna unit points to the passive element.

In a specific embodiment, the number of passive elements is one.

In a specific embodiment, each radio frequency channel is electrically connected to two quasi-Yagi antenna units to increase the antenna gain of a single radio frequency channel and compress the beam width.

In a specific embodiment, each radio frequency board includes a multilayer conductive layer provided with at least one radio frequency channel, and a single conductive layer provided with at least two quasi-Yagi antenna units. Wherein, the single-layer conductive layer and one conductive layer in the multi-layer conductive layer are located on the same conductive layer.

In a specific embodiment, the distance between any two adjacent radio frequency boards is 0.5 to 0.9 wavelength at the operating frequency of the quasi-Yagi antenna unit.

In a specific embodiment, a wedge-shaped locking strip for adjusting the distance between two adjacent radio frequency boards is provided between two adjacent radio frequency boards.

In the second aspect, the present invention also provides a millimeter wave base station device, which includes any of the above-mentioned quasi-Yagi antenna arrays. By adopting the quasi-Yagi antenna array, the bandwidth covered by millimeter wave base station equipment can be expanded. With the above-mentioned setting method, there is no need to adopt a stacking design method, which facilitates the integration of the antenna and the radio frequency board, thereby reducing the size of the millimeter wave base station equipment. The above method of integrating multiple quasi-Yagi antenna units arranged in an array on the radio frequency board can improve the antenna gain and receiving sensitivity of the quasi-Yagi antenna array, and there is no need to use radio frequency connectors to connect radio frequency cables and antennas, thereby reducing transmission loss.

In a specific embodiment, the millimeter wave base station equipment further includes a backplane connected to at least two radio frequency boards, an intermediate frequency board connected to the backplane, and a metal cover that includes the backplane, the radio frequency board and the intermediate frequency board and is used for shielding. Among them, the metal cover is provided with a radiation window for the radiation of the quasi-Yagi antenna unit to realize the connection of the radio frequency board and the intermediate frequency board, and the radiation of the quasi-Yagi antenna array.

Description of the drawings

FIG. 1 is a schematic diagram of a quasi-Yagi antenna array provided by an embodiment of the present invention;

2 is a top view of a radio frequency board provided by an embodiment of the present invention;

3 is a cross-sectional view of a radio frequency board provided by an embodiment of the present invention;

4 is a top view of a quasi-Yagi antenna unit provided by an embodiment of the present invention;

Figure 5 is a bottom view of a quasi-Yagi antenna unit provided by an embodiment of the present invention;

6 is a schematic diagram of S parameters of a quasi-Yagi antenna unit provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of a board card module provided by an embodiment of the present invention;

Figure 8 is a front view of a board card module provided by an embodiment of the present invention;

FIG. 9 is a schematic diagram of a millimeter wave base station device provided by an embodiment of the present invention.

Reference signs:

10-RF board 101-First RF board 102-Second RF board

11-Multi-layer conductive layer 12-Single conductive layer 13-RF channel

14-Quasi Yagi antenna unit 15-Balun structure 151-Impedance matching section

1511-first impedance matching section 1512-second impedance matching section

152-Phase shifter 1521-Inner edge angle 1522-Outer edge angle

16-active array 161-first active array 162-second active array

17-Passive array 18-Reflector 20-Board module

21-The first frame 22-The second frame 23-The third frame

24-wedge locking strip 241-first wedge block242-second wedge block

240-screw 30-back plate 40-intermediate frequency board

50-metal cover 51-radiation window 60-quasi-Yagi antenna array

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

In order to facilitate the understanding of the quasi-Yagi antenna array provided by the embodiment of the present invention, firstly, the application scenario will be explained. The quasi-Yagi antenna array is applied to wireless communication base station equipment to realize radio wave radiation and reception. The following is a detailed description of the Yagi antenna array in conjunction with the drawings.

The embodiment of the present invention provides a quasi-Yagi antenna array. Referring to FIG. 1, the quasi-Yagi antenna array includes at least two radio frequency boards 10 stacked and spaced apart. During the specific arrangement, the number of at least two radio frequency boards 10 can be at least two, such as 2, 3, 4, etc. The quasi-Yagi antenna array shown in FIG. 1 includes 8 radio frequency boards stacked and spaced apart. 10.

When each radio frequency board 10 is specifically arranged, as shown in FIG. 2, the radio frequency board 10 includes a multi-layer conductive layer 11 provided with at least one radio frequency channel 13, wherein the number of conductive layers can be specifically 2 layers or 3 layers. , 4 floors, etc. At least two floors. As shown in the radio frequency board 10 shown in FIG. 2, the number of radio frequency channels 13 provided thereon can be at least one, such as 1, 2, 3, etc. The radio frequency board 10 shown in FIG. 2 is provided with 8 radio frequency channels 13. In the specific setting, each radio frequency channel 13 is provided with a transmitting interface (TX) and a receiving interface (RX) for connecting with the outside, and a radio frequency link electrically connected with the transmitting interface and the receiving interface, so as to exchange information with the outside. .

Continuing to refer to FIG. 2, each radio frequency board 10 further includes a single-layer conductive layer 12 provided with at least two quasi-Yagi antenna units 14, and the single-layer conductive layer 12 and a conductive layer in the multilayer conductive layer 11 are located on the same conductive layer . During specific production, the single-layer conductive layer 12 extends from one conductive layer of the multi-layer conductive layer 11 to one side of the radio frequency board 10 to form a clearance area for the quasi-Yagi antenna unit 14 to radiate. Specifically, the single-layer conductive layer 12 shown in FIG. 3 is located on the same conductive layer as the conductive layer of the uppermost layer of the multilayer conductive layer 11 (take the position shown in FIG. 2 as a reference), that is, the single-layer conductive layer 12 It extends from the uppermost conductive layer of the multilayer conductive layer 11 to one side of the radio frequency board 10. With the above arrangement, the multilayer conductive layer 11 on the radio frequency board 10 can be used as a part of the reflector of the quasi-Yagi antenna unit 14 to ensure the radiation performance of the quasi-Yagi antenna array. It should be understood that the above-mentioned single-layer conductive layer 12 is not limited to the manner in which the conductive layer of the uppermost layer is located on the same conductive layer as shown in FIG. 2, and it can also be located at the lowermost layer or between the uppermost layer and the lowermost layer. Any conductive layer in the conductive layer is located on the same conductive layer.

When the quasi-Yagi antenna unit 14 is specifically set, the number of the quasi-Yagi antenna unit 14 may specifically be 2, 3, 4, etc. As shown in FIG. 2, a plurality of quasi-Yagi antenna units 14 are arranged in an array. Specifically, a plurality of quasi-Yagi antenna units 14 are arranged in a line on the single conductive layer 12 to form a flat quasi-Yagi antenna array to ensure accurate Radiation performance of Yagi antenna array. It should be understood that the array arrangement of the quasi-Yagi antenna units 14 is not limited to the in-line arrangement shown in FIG. 2, and other methods that can form an array arrangement can also be used.

As shown in FIG. 2, the radio frequency board 10 has each radio frequency channel 13 corresponding to at least one quasi-Yagi antenna unit 14. In specific settings, each radio frequency channel 13 is electrically connected to at least one quasi-Yagi antenna unit 14. Specifically, the number of quasi-Yagi antenna units 14 that can be electrically connected to each radio frequency channel 13 may specifically be at least one, such as one, two, or three. As shown in Fig. 2, each radio frequency channel 13 is electrically connected to two quasi-Yagi antenna units 14. In the specific setting, each radio frequency channel 13 is provided with a one-to-two power division network, which is the corresponding two quasi-Yagi antenna units. The Yagi antenna unit 14 is connected to realize the feeding of two quasi-Yagi antenna units 14 to increase the antenna gain of a single radio frequency channel 13 and compress the beam width. Through the above-mentioned setting method, 8 radio frequency channels 13 are arranged on each radio frequency board 10, and each radio frequency channel 13 corresponds to two quasi-Yagi antenna units 14, so that 16 quasi-Yagi antenna units 14 are formed on each radio frequency board 10. A planar quasi-Yagi antenna array composed of antenna elements 14 arrayed. And by stacking 8 radio frequency boards 10 and arranged at intervals, a spatial quasi-Yagi antenna array composed of 128 quasi-Yagi antenna units 14 arrays is formed, thereby forming a large-scale active array antenna with beamforming capability.

When each quasi-Yagi antenna unit 14 is specifically set up, as shown in FIG. 4, the quasi-Yagi antenna unit 14 includes a balun structure 15 electrically connected to the corresponding radio frequency channel 13, and an active component electrically connected to the balun structure 15 The element 16 and at least one passive element 17 located on the side of the active element 16 and away from the balun structure 15. The balun structure 15, the active element 16, and the passive element 17 are described in detail below.

As shown in FIG. 4, the balun structure 15 includes an impedance matching section 151 connected to the radio frequency channel 13 and a phase shifter 152 connected to the impedance matching section 151. In specific settings, the impedance matching section 151 is a quarter-wavelength impedance matching section at the operating frequency of the quasi-Yagi antenna unit 14. Specifically, the impedance matching section 151 shown in FIG. 3 is composed of two impedance matching sections 151 , Respectively are a first impedance matching section 1511 electrically connected to the radio frequency channel 13 and the phase shifter 152, and a second impedance matching section 1512 electrically connected to the active array 16 and the phase shifter 152. In the specific setting, first impedance matching section 1511 of length l ₁ and a second impedance whichever length l ₂ of section 1512 of about a quarter wavelength at the operating frequency of 14 Yagi antenna unit, in order to achieve an antenna impedance signal Adjustment. It should be understood that the foregoing only shows one way of the impedance matching section 151, and other ways can be used besides this. When the phase shifter 152 is specifically set, the phase shifter 152 as shown in FIG. 4 is specifically a broadband 180° phase shifter to realize the adjustment of the phase of the yagi antenna unit 14. As shown in Fig. 3, the phase shifter 152 has an inner edge angle 1521 of 90°, and an outer edge angle 1522 of the phase shifter 152 is a 45° cut angle to ensure a more uniform propagation of electromagnetic energy, thereby achieving broadband characteristics .

When the active element 16 is specifically set, as shown in FIG. 4, the active element 16 is specifically a dipole, which includes two sections electrically connected to the second impedance matching section 1512. For the convenience of the following description, the active element 16 includes symmetrically distributed first active elements 161 and second active elements 162. In a specific application, the feed source undergoes impedance transformation through the balun structure 15, and the power is divided into two signals of equal amplitude and opposite phase to feed the active array 16. The passive element 17 shown in FIG. 4 is distributed on one side of the active element 16 and has a certain distance from the active element 16. In specific settings, the length l _{3 of the} passive element 17 is 0.15 to 0.25 wavelength at the operating frequency of the quasi-Yagi antenna unit 14. Specifically, the length l _{3 of the} passive element 17 can be 0.15 at the operating frequency of the quasi-Yagi antenna unit 14. Wavelength, 0.18 wavelength, 0.19 wavelength, 0.20 wavelength, 0.21 wavelength, 0.22 wavelength, 0.25 wavelength, etc. Any value between 0.15 and 0.25 wavelength. 16 and a length greater than the time around the active length L passive time around 17 _3, Specifically, the first time around the active length l 161 ₄ and the second time around the active length of ₅ l 162 and greater than the length of the passive time around 17 l ₃ . And the distance d ₁ between the active element 16 and the passive element 17 is 0.3 to 0.5 wavelength at the working frequency of the quasi-Yagi antenna unit 14. Specifically, the distance d ₁ between the active element 16 and the passive element 17 can be It is 0.30 wavelength, 0.35 wavelength, 0.38 wavelength, 0.39 wavelength, 0.40 wavelength, 0.41 wavelength, 0.42 wavelength, 0.43 wavelength, 0.45 wavelength, 0.50 wavelength, etc., within the working frequency of quasi-Yagi antenna unit 14, which is between 0.3 and 0.5 wavelength. value. In the above scheme, the passive element 17 generates an induced current under the action of the active element 16 field to guide the radiation direction of electromagnetic energy and increase the gain. At the same time, the passive element 17 itself is also an input impedance matching unit, which adjusts the impedance of the antenna. . It should be understood that the number of passive elements 17 is not limited to one shown in FIG. 3, and it can also be two, three, four, etc. When the number of passive elements 17 is multiple, the passive elements 17 are arranged in order in the direction away from the active element 16.

In addition, referring to FIG. 5, a reflector 18 is provided on the surface of the single conductive layer 12 opposite to the balun structure 15, the active element 16 and the passive element 17 (the back of the single conductive layer 12). In the case of the reflector 18, it is a metal plate arranged on the back of the single-layer conductive layer 12 to form a grounded metal surface to enhance the radiation performance of the quasi-Yagi antenna unit 14.

Using the above setting method, the simulated and measured S parameters of the quasi-Yagi antenna unit 14 when applied to the millimeter wave frequency band are shown in Fig. 6. The gain of the quasi-Yagi antenna unit 14 is 5.5dBi and the relative working bandwidth exceeds 30%, which is fully satisfied Demand for millimeter wave test frequency bands in my country.

Specifically, when at least two radio frequency boards 10 are stacked and arranged at intervals, as shown in FIG. 1, the single conductive layers 12 in the multiple radio frequency boards 10 are located on the same side, so that the plurality of standard conductive layers 12 arranged on the single conductive layer 12 The Yagi antenna units 14 are located on the same side, forming a quasi-Yagi antenna array composed of a plurality of quasi-Yagi antenna units 14. And the distance d ₂ between two adjacent radio frequency boards 10 is 0.5 to 0.9 wavelength at the working frequency of the quasi-Yagi antenna unit 14. Specifically, the distance between two adjacent radio frequency boards 10 may be the quasi-Yagi antenna unit 14 0.5 wavelength, 0.55 wavelength, 0.60 wavelength, 0.65 wavelength, 0.70 wavelength, 0.75 wavelength, 0.80 wavelength, 0.85 wavelength, 0.90 wavelength and any value between 0.5 and 0.9 wavelength at the working frequency.

Because the millimeter wave wavelength is extremely short, the distance between the radio frequency boards 10 is relatively narrow. In order to effectively control the distance between the radio frequency boards 10 and facilitate the assembly of the whole machine, there is also provided between two adjacent radio frequency boards 10 for adjusting adjacent A device for adjusting the distance between two RF boards 10. In the specific setting, as shown in FIG. 7, first, two adjacent radio frequency boards 10 among the multiple stacked radio frequency boards 10 are formed into a board card module 20, so that at least one board including two radio frequency boards 10 can be formed. The card module 20, specifically, the number of the card module 20 that can be composed can be at least one, such as one, two, or three. And when there are multiple board modules 20, the multiple board modules 20 are also stacked and arranged at intervals. The gap between two adjacent board modules 20 is adjusted to achieve the adjustment of the distance between two adjacent radio frequency boards 10 . For the convenience of the following description, as shown in FIG. 7, each board module 20 includes a first radio frequency board 101 and a second radio frequency board 102 that are stacked. When setting up each board module 20, referring to FIGS. 7 and 8, first place the first radio frequency board 101 on the first frame 21 containing the first cavity, and then place the second radio frequency board 101 containing the second cavity on the first frame 21 The frame 22 is placed on the first radio frequency board 101, and the second frame 22 is provided with threaded through holes. Then through the through hole on the back of the first frame 21 (the surface under the first frame 21 in the position of FIG. 7), the first frame 21 and the first radio frequency board are locked by the screw reverse (set up from the back of the first frame 21) 101 and the second frame 22. Then place the second radio frequency board 102 on the second frame 22, and then place the third frame 23 containing the third cavity on the second radio frequency board 102, and then from the front (located in the third frame 23 in the position of FIG. 7 The upper surface) fix the second frame 22, the second RF board 102 and the third frame 23 with screws, so that the adjacent RF board 10 is formed by the first frame 21, the second frame 22 and the third frame 22 A board module 20. After that, the wedge-shaped locking strip 24 in the prior art is used to connect two adjacent board card modules 20. Specifically, the first wedge-shaped block 241 in the wedge-shaped locking strip 24 is connected to one of the two adjacent board card modules 20. The board card module 20 is fixedly connected by screw fastening, and the second wedge block 242 in the wedge-shaped locking strip 24 is fixedly connected with the other board module 20 of the two adjacent board card modules 20 by screw fastening. When the screw 240 in the wedge-shaped locking bar 24 rotates, it can increase or decrease the deviation between the first wedge block 241 and the second wedge block 242, thereby adjusting the distance between two adjacent board modules 20 , In order to realize the adjustment of the distance between two adjacent radio frequency boards 10.

It should be understood that the foregoing only shows one way of adjusting the device. In addition to this, other ways of adjusting the distance between two adjacent radio frequency boards 10 may also be used. For example, the adjusting device includes a first housing fixedly connected to one of the two adjacent radio frequency boards 10, and the other radio frequency board 10 of the two adjacent radio frequency boards 10 is fastened, bonded, It is fixed on the second housing by means such as snap connection. The first wedge block 241 on the wedge-shaped locking strip 24 is fixedly connected to the first housing by means of screw fastening, clamping, etc., and the second wedge block 242 on the wedge-shaped locking strip 24 is fastened by screws, clamping, etc. It is fixedly connected to the second housing, the first wedge block 241 and the second wedge block 242 are connected by a screw 240, and when the screw 240 is rotated, the first wedge block 241 and the second wedge block 242 can be increased or decreased Therefore, the distance between the first housing and the second housing can be adjusted to realize the adjustment of the distance between two adjacent radio frequency boards 10.

In the above technical solution, at least one radio frequency channel 13 and at least two radio frequency channels 13 electrically connected to at least one radio frequency channel 13 and arranged in an array are provided on each of the at least two radio frequency boards 10 stacked and spaced apart. A quasi-Yagi antenna unit 14, thereby expanding the working bandwidth of the quasi-Yagi antenna array. With the above-mentioned setting method, there is no need to adopt a stacked design method, which facilitates the integration of the antenna and the radio frequency board 10, thereby reducing the size of the base station equipment. The above-mentioned method of integrating multiple quasi-Yagi antenna units 14 arranged in an array on the radio frequency board 10 can improve the antenna gain and receiving sensitivity of the quasi-Yagi antenna array, and there is no need to use radio frequency connectors to connect radio frequency cables and antennas, thereby reducing transmission loss . By adding the balun structure 15 to the quasi-Yagi antenna unit 14 to realize the conversion from unbalance to balance, the broadband characteristic of the quasi-Yagi antenna unit 14 is realized.

In addition, the embodiment of the present invention also provides a millimeter wave base station device. Referring to FIG. 9, the millimeter wave base station device includes any of the above-mentioned quasi-Yagi antenna arrays 60.

In specific settings, the millimeter wave base station equipment shown in FIG. 9 includes a backplane 30 connected to the above-mentioned at least two radio frequency boards 10, and an intermediate frequency board 40 connected to the backplane 30. By making the radio frequency board 10 and the backplane 30 is connected, the intermediate frequency board 40 is connected to the backplane 30, so as to realize the connection between the intermediate frequency board 40 and the radio frequency board 10. The millimeter wave base station equipment shown in FIG. 9 also includes a metal cover 50 that wraps the backplane 30, the intermediate frequency board 40, and the quasi-Yagi antenna array 60 and is used for shielding. When specifically set up, the metal cover 50 is made of metal. The shell structure, the back plate 30, the intermediate frequency board 40 and the quasi-Yagi antenna array 60 are arranged in the metal cover 50.

As shown in FIG. 9, the metal cover 50 is provided with a radiation window 51 for radiation of the quasi-Yagi antenna array 60. When the radiation window 51 is specifically set, as shown in FIG. 9, the radiation window 51 is arranged on the side of the metal cover 50 close to the quasi-Yagi antenna unit 14, so as to facilitate the radiation of the quasi-Yagi antenna unit 14. The radiation window 51 is provided with a plate made of materials that do not affect the antenna radiation, such as plastic, glass fiber reinforced plastic, and the like, to cover the radiation window 51 to protect the quasi-Yagi antenna array 60 in the metal cover 50.

In the above technical solution, the quasi-Yagi antenna array 60 is adopted to expand the bandwidth covered by the millimeter wave base station equipment during operation. With the above-mentioned setting method, there is no need to adopt a stacked design method, which facilitates the integration of the antenna and the radio frequency board 10, thereby reducing the size of the millimeter wave base station equipment. The above-mentioned method of integrating multiple quasi-Yagi antenna units 14 arranged in an array on the radio frequency board 10 can improve the antenna gain and receiving sensitivity of the quasi-Yagi antenna array 60, and there is no need to use radio frequency connectors to connect radio frequency cables and antennas, thereby reducing transmission loss.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

A quasi-Yagi antenna array is characterized in that it comprises:

At least two radio frequency boards stacked and arranged at intervals, each radio frequency board is provided with at least one radio frequency channel and at least two quasi-Yagi antenna units arranged in an array, wherein each radio frequency channel corresponds to at least one quasi-Yagi antenna unit;

Each quasi-Yagi antenna unit includes: a balun structure electrically connected to the corresponding radio frequency channel; an active element electrically connected to the balun structure; at least one side of the active element and away from the balun structure A passive period.
The quasi-Yagi antenna array of claim 1, wherein the balun structure includes an impedance matching section electrically connected to a corresponding radio frequency channel and electrically connected to the active element, and an impedance matching section electrically connected to the impedance matching section. Electrically connected phase shifter.
The quasi-Yagi antenna array according to claim 2, wherein the inner edge angle of the phase shifter is 90°, and the outer edge angle of the phase shifter is a 45° cut angle.
The quasi-Yagi antenna array of claim 2, wherein the phase shifter is a broadband 180° phase shifter, and the impedance matching section is a quarter wavelength of the operating frequency of the quasi-Yagi antenna unit Impedance matching section.
The quasi-Yagi antenna array according to any one of claims 1 to 4, wherein the length of the passive element is less than the length of the active element, and the length of the passive element is the length of the quasi-Yagi 0.3～0.5 wavelength under the working frequency of the antenna unit;

And the distance between the active element and the passive element closest to the active element is 0.15-0.25 wavelength at the operating frequency of the quasi-Yagi antenna unit.
The quasi-Yagi antenna array of claim 5, wherein each radio frequency board comprises a multi-layer conductive layer provided with the at least one radio frequency channel, and a single-layer conductive layer provided with the at least two quasi-Yagi antenna units , Wherein the single conductive layer and one conductive layer in the multilayer conductive layer are located on the same conductive layer.
The quasi-Yagi antenna array according to claim 5, wherein the distance between any two adjacent radio frequency boards is 0.5-0.9 wavelength at the operating frequency of the quasi-Yagi antenna unit.
7. The quasi-Yagi antenna array according to claim 7, wherein a wedge-shaped locking strip for adjusting the distance between the two adjacent radio frequency boards is arranged between two adjacent radio frequency boards.
A millimeter wave base station equipment, characterized by comprising the quasi-Yagi antenna array according to any one of claims 1-8.
8. The millimeter wave base station equipment of claim 9, further comprising:

A backplane connected to the at least two radio frequency boards;

An intermediate frequency board connected to the backplane;

A metal cover that wraps the backplane, the radio frequency board, and the intermediate frequency board and is used for shielding, wherein the metal cover is provided with a radiation window for radiation of the quasi-yagi antenna unit.