Multi-antenna for wireless local area network

Abstract

The invention discloses a multi-antenna for a wireless local area network, which is arranged on the surface of a base in a wireless access point, and comprises a first antenna group, a second antenna group, a third antenna group and a fourth antenna group, wherein the four dual-frequency antennas are dual-frequency antennas working at 2.4 GHz and 5GHz, and the four dual-frequency antennas are respectively close to four edges of the surface of the base; the second antenna group is a 6GHz antenna group and is provided with four printed circuit board antennas, the four printed circuit board antennas are horizontally placed on the surface of the base, the four printed circuit board antennas are respectively close to four edges of the surface of the base, and each printed circuit board antenna is provided with eight branches; the third antenna group comprises two three-frequency antennas and works in three frequency bands of 2.4 GHz, 5GHz and 6GHz; and the single-frequency antenna is a 2.4 GHz omnidirectional antenna. The multi-antenna provided by the invention can meet the requirements of radiation pattern design and multi-band use.

Description

Technical Field

[0001] The present invention relates to a wireless local area network antenna, belonging to the technical field of antennas. Background Art

[0002] Compared with the antennas of terminal devices, base station antennas, such as the antennas of wireless access points, need to be able to generate a radiation field pattern in a specific direction to enable wireless communication with terminal devices located at various specific positions. And in order to improve communication efficiency, the function of multiple-input multiple-output (MIMO) is usually configured.

[0003] Generally speaking, although an array antenna can be used to control a specific radiation field pattern, the control circuit of the array antenna (including switches, phase control, feeding network, etc.) introduces more transmission loss problems. Especially in the case where current electronic devices require antennas to be thin, light, short, and small, the circuit area of the feeding network may be larger than the antenna array, making it difficult to reduce the overall volume of the antenna array module, and resulting in a relatively high manufacturing cost for traditional products using controllable radiation field pattern antennas. Furthermore, for wireless local area networks (WLANs), in order to meet the usage requirements of multiple frequency bands, the current used frequency bands range from 2.4 GHz, 5 GHz to 6 GHz, and the 6 GHz band is a relatively new band (5925 MHz to 7125 MHz) used in the currently promoted WiFi 6E specification. The increase in the frequency band range can reduce communication congestion and reduce interference between narrow frequency bands.

[0004] However, when radiation field pattern design is required, it is very difficult to simultaneously meet the requirements of limited antenna volume, wide multi-band applications, and multiple-input multiple-output functions. Antenna R & D manufacturers of wireless access points must overcome and solve multiple problems they face. Summary of the Invention

[0005] Aiming at the defects of the above-mentioned prior art, the present invention provides a multi-antenna for a wireless local area network, which meets the requirements of radiation field pattern design and multi-band usage.

[0006] The technical solution of the present invention is as follows: A multi-antenna for a wireless local area network, characterized in that it is arranged on the surface of a base in a wireless access point, and the multi-antenna for a wireless local area network includes:

[0007] A first antenna group, including four dual-band antennas; wherein, the four dual-band antennas are dual-band antennas operating at 2.4 GHz and 5 GHz, and the four dual-band antennas are respectively close to four edges of the surface of the base;

[0008] The second antenna group, which is a 6 GHz antenna group, has four printed circuit board antennas. The four printed circuit board antennas are horizontally placed on the surface of the base, and the four printed circuit board antennas are respectively close to the four edges of the surface of the base. Each printed circuit board antenna has eight leaf branches;

[0009] The third antenna group includes two triple-band antennas that operate in three frequency bands including 2.4 GHz, 5 GHz, and 6 GHz; and

[0010] The single-frequency antenna is a 2.4 GHz omnidirectional antenna.

[0011] Further, each printed circuit board antenna includes a double-sided substrate, a first antenna body, and a second antenna body. The double-sided substrate has an upper surface and a lower surface. The first antenna body is disposed on the upper surface, and the second antenna body is disposed on the lower surface;

[0012] Wherein, the first antenna body has four main leaf branches. The four main leaf branches are connected to a first central feed point, and the first central feed point is connected to the central conductor of the coaxial cable;

[0013] Wherein, the second antenna body has four secondary leaf branches. The four secondary leaf branches are connected to a second central feed point, and the second central feed point is connected to the outer conductor of the coaxial cable;

[0014] Wherein, the four main leaf branches and the four secondary leaf branches correspond one-to-one to jointly form the eight leaf branches;

[0015] Wherein, the four main leaf branches are radially distributed around the first central feed point, and the four main leaf branches are distributed around the first central feeder at an angular difference of every ninety degrees; wherein, the four secondary leaf branches are radially distributed around the second central feed point, and the four secondary leaf branches are distributed around the second central feeder at an angular difference of every ninety degrees.

[0016] Further, each main leaf branch is composed of a main extension section and a main fan blade section. The main extension section is connected between the first central feed point and the main fan blade section. The first end of the main fan blade section is connected to the main extension section, and the second end of the main fan blade section extends in a direction perpendicular to the main extension section;

[0017] Wherein, each secondary leaf branch is composed of a secondary extension section and a secondary fan blade section. The secondary extension section is connected between the second central feed point and the secondary fan blade section. The first end of the secondary fan blade section is connected to the secondary extension section, and the second end of the secondary fan blade section extends in a direction perpendicular to the secondary extension section;

[0018] Among them, in the horizontal projection of the double-sided substrate, the main extension section and the corresponding sub-extension section overlap each other;

[0019] Among them, in the horizontal projection of the double-sided substrate, the extending direction of the main fan blade section and the extending direction of the corresponding sub-fan blade section are away from each other;

[0020] Among them, from the perspective of the upper surface, when the extending direction of the main fan blade section is counterclockwise, the extending direction of the sub-fan blade section is clockwise; from the perspective of the upper surface, when the extending direction of the main fan blade section is clockwise, the extending direction of the sub-fan blade section is counterclockwise.

[0021] Furthermore, for one of the four printed circuit board antennas, its main fan blade section extends in the counterclockwise direction, and for another one of the four printed circuit board antennas, its main fan blade section extends in the clockwise direction.

[0022] Furthermore, the main extension section has a rectangular widening part, and the rectangular widening part is adjacent to the corresponding main fan blade section; wherein, the rectangular widening part is used to adjust impedance matching.

[0023] Furthermore, the main extension section has a field pattern adjustment part, and the field pattern adjustment part is used to adjust the radiation field pattern.

[0024] Furthermore, the four dual-band antennas are planar inverted F antennas made of all metal and are vertically arranged on the surface of the base; wherein, the single-band antenna is vertically arranged on the surface of the base; wherein, the two triple-band antennas are horizontally placed on the surface of the base.

[0025] Furthermore, the first antenna group and the third antenna group together are multi-input multi-output antennas for 2.4 GHz and 5 GHz.

[0026] Furthermore, the second antenna group is a multi-input multi-output antenna for 6 GHz.

[0027] Furthermore, the second antenna group and the third antenna group together are multi-input multi-output antennas for 6 GHz.

[0028] Compared with the prior art, the advantages of the technical solution provided by the present invention are as follows:

[0029] The multi-antenna for wireless local area network of the present invention can not only be applied to the 2.4 GHz, 5 GHz and 6 GHz frequency bands, but also be used to realize various different multi-input multi-output (MIMO) application combinations. The eight-leaf branch can achieve the effect of radiation field pattern design, and the present invention can achieve the effects of multi-antenna integration and reduced occupied space, and has high industrial application value. Description of the Drawings

[0030] Figure 1 It is a schematic diagram of the multi - antenna for a wireless local area network provided by an embodiment of the present invention, with the multi - antenna disposed on the surface of the base.

[0031] Figure 2 It is a three - perspective schematic diagram of the printed circuit board ANT5 of the second antenna group provided by an embodiment of the present invention.

[0032] Figure 3 It is a schematic diagram of the upper surface of the printed circuit board ANT5 of the second antenna group provided by an embodiment of the present invention.

[0033] Figure 4 It is a three - perspective schematic diagram of the printed circuit board ANT6 of the second antenna group provided by an embodiment of the present invention.

[0034] Figure 5 It is a schematic diagram of the upper surface of the printed circuit board ANT6 of the second antenna group provided by an embodiment of the present invention.

[0035] Figure 6 It is a three - perspective schematic diagram of the printed circuit board ANT7 of the second antenna group provided by an embodiment of the present invention.

[0036] Figure 7 It is a schematic diagram of the upper surface of the printed circuit board ANT7 of the second antenna group provided by an embodiment of the present invention.

[0037] Figure 8 It is a three - perspective schematic diagram of the printed circuit board ANT8 of the second antenna group provided by an embodiment of the present invention.

[0038] Figure 9 It is a schematic diagram of the upper surface of the printed circuit board ANT8 of the second antenna group provided by an embodiment of the present invention.

[0039] Figure 10 It is the radiation pattern in the X - Y plane of the printed circuit board ANT5 at the frequency point of 6500 MHz provided by an embodiment of the present invention.

[0040] Figure 11 It is the radiation pattern in the X - Z plane of the printed circuit board ANT6 at the frequency point of 6500 MHz provided by an embodiment of the present invention.

[0041] Figure 12 It is the radiation pattern in the X - Z plane of the printed circuit board ANT7 at the frequency point of 6500 MHz provided by an embodiment of the present invention.

[0042] Figure 13It is the radiation pattern diagram of the X-Y plane of the printed circuit board ANT8 provided by the embodiment of the present invention at the frequency point of 6500 MHz. Detailed implementation manners

[0043] The present invention will be further described below in conjunction with embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. After reading this description, various equivalent modifications made by those skilled in the art to this description all fall within the scope defined by the appended claims of this application.

[0044] Please refer to Figure 1 , this embodiment provides a multi-antenna for a wireless local area network. In the embodiment of Figure 1 , there are a total of 11 antennas (ANT1, ANT2, ANT3, ANT4, ANT5, ANT6, ANT7, ANT8, ANT9, ANT10, and ANT11 respectively). The multi-antenna for the wireless local area network is disposed on the base surface BS within a wireless access point. The multi-antenna for the wireless local area network includes a first antenna group 1, a second antenna group 2, a third antenna group 3, and a single-frequency antenna ANT9. The first antenna group 1 includes four dual-frequency antennas ANT1, ANT2, ANT3, and ANT4. The four dual-frequency antennas ANT1, ANT2, ANT3, and ANT4 are dual-frequency antennas operating at 2.4 GHz and 5 GHz, and the four dual-frequency antennas ANT1, ANT2, ANT3, and ANT4 are respectively close to the four edges of the base surface BS. Figure 1 The base surface BS of Figure 1For example, the printed circuit board antenna ANT5 is at the edge near the upper side of the drawing surface, that is, near the negative edge of the Y-axis. The printed circuit board antenna ANT6 is at the edge near the right side of the drawing surface, that is, near the negative edge of the X-axis. The printed circuit board antenna ANT7 is at the edge near the left side of the drawing surface, that is, near the positive edge of the X-axis. And the printed circuit board antenna ANT8 is at the edge near the lower side of the drawing surface, that is, near the positive edge of the Y-axis. Each of the printed circuit board antennas ANT5, ANT6, ANT7, and ANT8 has eight-leaf branches, which will be further described later. The third antenna group 3 includes two triple-band antennas ANT10 and ANT11, which operate in three frequency bands including 2.4 GHz, 5 GHz, and 6 GHz. The single-band antenna ANT9 is a 2.4 GHz omnidirectional antenna.

[0045] In Figure 1 , for the above four dual-band antennas ANT1, ANT2, ANT3, and ANT4, four printed circuit board antennas ANT5, ANT6, ANT7, and ANT8, single-band antenna ANT9, and two triple-band antennas ANT10 and ANT11, they are all correspondingly marked with numbers 1 to 11. The angles of the drawn numbers 1 to 11 are used to represent the horizontal rotation angles of the corresponding antennas placed on the base surface BS. For example, the printed circuit board antenna ANT8 is placed directly without rotation, the printed circuit board antenna ANT5 is placed after rotating 180 degrees (so it looks upside down in Figure 1 ), the printed circuit board antenna ANT7 is placed after rotating 90 degrees to the left, and the printed circuit board antenna ANT6 is placed after rotating 90 degrees to the right. For the four dual-band antennas ANT1, ANT2, ANT3, and ANT4 of the first antenna group 1, they are planar inverted-F antennas made of all metal and are vertically arranged on the base surface BS. The dual-band antennas ANT1, ANT2, ANT3, and ANT4 can directly use the traditional planar inverted-F antenna (PIFA) design, which will not be elaborated here. The first antenna group 1 is used for traditional 2.4 GHz communication or traditional 5 GHz communication, and is not necessarily used for the communication requirements of multiple-input multiple-output (MIMO).

[0046] Please refer to Figure 2 , Figure 4 , Figure 6 and Figure 8 . Similarly, Figure 2 is a three-view schematic diagram of the printed circuit board antenna ANT5, Figure 4 is a three-view schematic diagram of the printed circuit board antenna ANT6, Figure 6 is a three-view schematic diagram of the printed circuit board antenna ANT7, Figure 8 is a three-view schematic diagram of the printed circuit board antenna ANT8. First, take Figure 6For illustration with reference to Figure 2 , Figure 4 and Figure 8 are the same situation. Each of the printed circuit board antennas ANT5, ANT6, ANT7, or ANT8 of the second antenna group 2 includes a double-sided substrate 20, a first antenna body 21, and a second antenna body 22. The double-sided substrate 20 has an upper surface 201 and a lower surface 202. The first antenna body 21 is disposed on the upper surface 201, and the second antenna body 22 is disposed on the lower surface 202. Then, part (a) is the perspective of the upper surface 201 (or called the front perspective), part (b) is the side perspective, and part (c) is the perspective of the lower surface 202 (or called the bottom perspective). The first antenna body 21 has four main lobe branches 21A, 21B, 21C, 21D. The four main lobe branches 21A, 21B, 21C, 21D are connected to the first central feed point F1, and the first central feed point F1 is connected to the central conductor of the coaxial cable as the signal connection end. The drawing of the coaxial cable is omitted in the figure, and the coaxial cable is a conventional technical means in the art. The second antenna body 22 has four sub-lobe branches 22A, 22B, 22C, 22D. The four sub-lobe branches 22A, 22B, 22C, 22D are connected to the second central feed point F2, and the second central feed point F2 is connected to the outer conductor of the coaxial cable as the signal ground end.

[0047] Furthermore, continuing to refer to Figure 6 , the four main lobe branches 21A, 21B, 21C, 21D and the four sub-lobe branches 22A, 22B, 22C, 22D are in one-to-one correspondence to jointly form eight lobe branches. The four main lobe branches 21A, 21B, 21C, 21D are radially distributed around the first central feed point F1. The four main lobe branches 21A, 21B, 21C, 21D are distributed around the first central feeder F1 at an angular difference of every ninety degrees. The four sub-lobe branches 22A, 22B, 22C, 22D are radially distributed around the second central feed point F2. The four sub-lobe branches 22A, 22B, 22C, 22D are distributed around the second central feeder F2 at an angular difference of every ninety degrees. Figure 2 , Figure 4 and Figure 8 are the same situation.

[0048] Similarly referring to Figure 6Taking [the relevant reference] as an example, each main lobe branch 21A, 21B, 21C or 21D is composed of a main extension section 211 and a main fan blade section 212. The main extension section 211 is connected between the first central feed point F1 and the main fan blade section 212. The first end 212a of the main fan blade section 212 is connected to the main extension section 211, and the second end 212b of the main fan blade section 212 extends in a direction perpendicular to the main extension section 211. Each secondary lobe branch 22A, 22B, 22C, 22D is composed of a secondary extension section 221 and a secondary fan blade section 222. The secondary extension section 221 is connected between the second central feed point F2 and the secondary fan blade section 222. The first end 222a of the secondary fan blade section 222 is connected to the secondary extension section 221, and the second end 222b of the secondary fan blade section 222 extends in a direction perpendicular to the secondary extension section 221. Each printed circuit board antenna ANT5, ANT6, ANT7 or ANT8 of the second antenna group 2 operates in the frequency band of 5.925 GHz to 7.125 GHz. Regarding Figures 2 to 8 For the embodiment of [the relevant reference], the double-sided substrate 20 is a square double-sided substrate. In the direction of the detailed dimensions: the side length is 25 millimeters (mm). An FR4 substrate with a thickness of 0.8 millimeters (dielectric constant is approximately 4.4) is used. The length of the main extension section 211 of each main lobe branch 21A, 21B, 21C or 21D is about 12.2 millimeters, and the line width of the main extension section 211 is about 0.5 millimeters. The length of the main fan blade section 212 can be set between 7 millimeters and 12 millimeters, and the line width is about 2 millimeters. The length of the secondary extension section 221 is the same as that of the main extension section 211, about 12.2 millimeters, and the line width of the secondary extension section 221 is about 1 millimeter. The length of the secondary fan blade section 222 is fixed at about 7 millimeters. The secondary fan blade section 222 has the same width as the main fan blade section 212, which is 2 millimeters.

[0049] Furthermore, in the horizontal projection of the double-sided substrate 20, the main extension section 211 and the corresponding secondary extension section 221 overlap each other, indicating that their positions, lengths and widths are the same. In the horizontal projection of the double-sided substrate 20, the extension directions of the main fan blade section 212 and the corresponding secondary fan blade section 222 are away from each other. In one case, taking Figure 2 the printed circuit board antenna ANT5 as an example, from the perspective of the upper surface 201 (front perspective), when the extension direction of the main fan blade section 212 is counterclockwise, the extension direction of the secondary fan blade section 222 is clockwise. It should be noted that Figure 2 from the back perspective, the extension direction of the secondary fan blade section 222 is counterclockwise, and when reflected in the front perspective, it becomes clockwise. Figure 6 The printed circuit board antenna ANT7 and Figure 8 the printed circuit board antenna ANT8 are also in the same situation. In another case, from the perspective of the upper surface 201, taking Figure 4Taking the printed circuit board antenna ANT6 as an example, when the extending direction of the main fan blade segment 212 is clockwise, the extending direction of the secondary fan blade segment 222 is counterclockwise.

[0050] For the field pattern design requirements of multiple antennas and the performance requirements of multiple-input multiple-output, preferably, among the four printed circuit board antennas of the second antenna group (the 6 GHz antenna group), at least one has a fan blade extending direction different from the other three: for example, one has its main fan blade segment extending counterclockwise, while the main fan blade segments of the other three extend clockwise; for another example, two have their main fan blade segments extending counterclockwise, while the main fan blade segments of the other two extend clockwise; for yet another example, exactly Figures 2 to 8 in the example of, one has its main fan blade segment extending clockwise ( Figure 4 the printed circuit board antenna ANT6), while the main fan blade segments of the other three extend counterclockwise (the printed circuit board antennas ANT5, ANT7, and ANT8). In other words, for one of the four printed circuit board antennas, its main fan blade segment extends counterclockwise, and for another one of the four printed circuit board antennas, its main fan blade segment extends clockwise. In short, for the main fan blade segments of the four printed circuit board antennas, one must be clockwise and one must be counterclockwise.

[0051] Preferably, based on Figure 6 , and with reference to Figure 7 the upper surface of the printed circuit board ANT7 shown, the main extension segment 211 has a rectangular widening portion 211a, and the rectangular widening portion 211a is adjacent to the corresponding main fan blade segment 212. Similarly, Figure 2 and Figure 3 the printed circuit board ANT5 of Figure 4 and Figure 5 the printed circuit board ANT6 of Figure 8 and Figure 9 the printed circuit board ANT8 of all have a rectangular widening portion 211a. The rectangular widening portion 211a has the same extending direction as the main extension segment 211 and is generally strip-shaped. The rectangular widening portion 211a increases the line width of the main extension segment 211. In Figures 2 to 9 the embodiment, the line width of the rectangular widening portion 211a is 1 millimeter. And for the main extension segment 211, the rectangular widening portion 211a is located on the same side as the extending direction of the main fan blade segment 212, having the effect of improving the uniform and forward guiding current. The rectangular widening portion 211a is used to adjust the impedance matching.

[0052] Preferably, in Figure 2 , Figure 4 and Figure 8In the embodiment, the main extension section 211 further has a field pattern adjustment section 211b, and the field pattern adjustment section 211b is corresponding to Figure 3 , Figure 5 and Figure 9 are marked with symbols in the embodiment. The field pattern adjustment section 211b is used to adjust the radiation field pattern, and even enable the second antenna group 2 to provide better multi-input multi-output communication performance at 6 GHz. For the configuration of the field pattern adjustment section 211b, the field pattern adjustment section 211b can be selectively arranged on some of the main lobe branches 21A, 21B, 21C or 21D. Refer to Figure 3 , Figure 5 and Figure 9 . For the structure and position of the field pattern adjustment section 211b, the field pattern adjustment section 211b has the same extension direction as the main extension section 211, and both are generally strip-shaped. For the main extension section 211, the field pattern adjustment section 211b is located on the side opposite to the extension direction of the main fan blade section 212. That is, the field pattern adjustment section 211b and the rectangular widening section 211a are respectively on different sides of the main extension section 211. Preferably, the line width of the field pattern adjustment section 211b is between 1.5 mm and 3 mm.

[0053] For the design of this multi-antenna, the four printed circuit board antennas (ANT5, ANT6, ANT7, ANT8) of the second antenna group 2 in this embodiment are arranged at different positions on the base surface BS, and the base surface BS has various required circuits, such as a power supply circuit, a fixed network circuit, and a wireless network circuit. There are also heat dissipation metal components, locking metal parts, and even metal parts of the internal structure and external structure are possible. Therefore, the antenna characteristics will be affected by different application models. The field pattern adjustment section 211b of the present invention is used to modify the field pattern of each printed circuit board antenna (ANT5, ANT6, ANT7 or ANT8). With the above-mentioned number and position of the four antennas, each printed circuit board antenna of the second antenna group 2 can have a better field pattern to meet a larger communication coverage range or improve the overall performance of multi-input multi-output. The following describes the application methods of the four printed circuit board antennas ANT5, ANT6, ANT7, ANT8, for example Figures 2 to 9 . First, all the sub-fan blade sections 222 have the same size, and the extension direction (clockwise or counterclockwise) of the sub-fan blade section 222 is designed according to the corresponding main fan blade section 212 (described above). Then, use Figure 6The printed circuit board antenna ANT7, as the most basic initial design, only has a rectangular widened portion 211a to adjust impedance matching. The rectangular widened portion 211a increases the overall line width of the main extension section 211. The length of the rectangular widened portion 211a of the printed circuit board antenna ANT7 is approximately three-quarters of the length of the main extension section 211 itself. The other three printed circuit board antennas ANT5, ANT6, and ANT8 are all modified based on the printed circuit board antenna ANT7. Then, a field pattern adjustment portion 211b is used in the printed circuit board antennas ANT5, ANT6, and ANT8 to adjust the radiation field pattern. And, in the case where the field pattern adjustment portion 211b is applied, the rectangular widened portions 211a of the main lobe branches 21A, 21B, 21C, and 21D are all uniformly shortened to half the length of the main extension section 211 to cope with the change in impedance value. The way to uniformly change the length of the rectangular widened portion 211a in all the main lobe branches 21A, 21B, 21C, and 21D is to reduce the design variables to simplify parameter adjustment. For example, in response to the use result of the field pattern adjustment portion 211b, the length of the rectangular widened portion 211a can be uniformly modified to two-thirds of the length of the main extension section 211, or other lengths can be used as long as the impedance bandwidth can be improved.

[0054] Furthermore, referring to Figures 10 to 13 , Figure 10 Figure 7 is the radiation field pattern diagram of the printed circuit board ANT5 in the X-Y plane at the frequency point of 6500 MHz. Figure 11 Figure 8 is the radiation field pattern diagram of the printed circuit board ANT6 in the X-Z plane at the frequency point of 6500 MHz. Figure 12 Figure 9 is the radiation field pattern diagram of the printed circuit board ANT7 in the X-Z plane at the frequency point of 6500 MHz. Figure 13 Figure 10 is the radiation field pattern diagram of the printed circuit board ANT8 in the X-Y plane at the frequency point of 6500 MHz. Taking the radiation field pattern at the frequency point of 6500 MHz as an example, the field pattern trends at other frequency points in the range of 5925 MHz to 7125 MHz are similar. Continuing with the Figures 2 to 9 structure as an example, in conjunction with Figures 10 to 13 , to illustrate the results achieved by using the field pattern adjustment portion 211b. Figure 1 The base surface BS of

[0055] is in the X-Y plane, and the positive direction of the Z axis is the direction perpendicular to the base surface BS above. Figure 6 and Figure 7 For the printed circuit board antenna ANT7 that does not use the field pattern adjustment portion 211b, when applied to the Figure 1 base surface BS, at Figure 12 it can be seen that the radiation field pattern is slightly offset towards the positive X-axis direction (the 90-degree direction is the positive X-axis direction, and at Figure 12It can be seen that the protrusion is most obvious in the direction of about 60 degrees). Therefore, the radiation field pattern offset directions of the other three printed circuit board antennas (ANT5, ANT6, and ANT8) need to be different to expand the signal coverage or improve the communication efficiency of multiple-input multiple-output. Next, compared with the printed circuit board ANT7, the printed circuit board ANT6 designed to be on the opposite side (the other opposite edge) has, from Figure 5 It can be seen that the printed circuit board ANT6 uses the field pattern adjustment unit 211b in the main lobe branch 21A, the main lobe branch 21B, and the main lobe branch 21C to provide a field pattern offset toward the negative X-axis (refer to Figure 11 , Figure 11 the 270-degree direction is the negative X-axis, and the protrusion is most obvious between 270 degrees and 330 degrees), and the field pattern deviation is exactly opposite to the radiation field pattern deviation of the printed circuit board ANT7. It should be noted that the main difference in the field patterns between the printed circuit board antenna ANT7 and the printed circuit board antenna ANT6 is in the X-Z plane (such as Figure 11 and Figure 12 ), and the differences in the field patterns in other planes such as the X-Y plane and the Y-Z plane are quite insignificant and will not be discussed.

[0056] Furthermore, the printed circuit board ANT5 uses the field pattern adjustment unit 211b in the main lobe branch 21A and the main lobe branch 21D (refer to Figure 3 ), to provide a field pattern offset toward the positive Y-axis, refer to Figure 10 , Figure 10 the 90-degree direction is the positive Y-axis, that is, overall, the field pattern is offset in the left half plane from 0 to 180 degrees. Moreover, compared with the printed circuit board ANT5, the printed circuit board ANT8 located on the opposite side (the other opposite edge) uses the field pattern adjustment unit 211b in the main lobe branch 21B and the main lobe branch 21C (refer to Figure 9 ), to provide a field pattern offset toward the negative Y-axis, that is, overall, the field pattern is offset in the right half plane from 180 degrees to 360 degrees (refer to Figure 13 , the protrusion is most obvious around about 300 degrees of the field pattern, and 270 degrees is the negative Y-axis). It should be noted that the main difference in the field patterns between the printed circuit board antenna ANT5 and the printed circuit board antenna ANT8 is in the X-Y plane (such as Figure 10 and Figure 13), the field pattern differences in other planes such as the XZ plane and the YZ plane are not obvious and will not be discussed. In short, before implementing the antenna design, the base surface BS is usually determined, and the placement of the circuit thereon is also determined (i.e., the environment around the antenna). When the placement of the four printed circuit boards ANT5, ANT6, ANT7, and ANT8 is also determined, the field pattern adjustment portion 211b can be selectively used for the printed circuit boards ANT5, ANT6, and ANT8 to obtain a more suitable radiation pattern without using the field pattern adjustment portion 211b for the printed circuit board ANT7.

[0057] Furthermore, the two tri-band antennas ANT10 and ANT11 of the third antenna group 3 are placed horizontally on the surface of the base. Since it works in three wide frequency bands including 2.4 GHz, 5 GHz and 6 GHz, the antenna is relatively large in size, and a multi-path planar inverted F-shaped antenna or a short-circuited monopole antenna can be used, and it can be integrated into a single printed circuit board to reduce the size and reduce the cost. It is mainly placed near the single-band antenna ANT9. Compared with the first antenna group 1 and the second antenna group 2, the two tri-band antennas ANT10 and ANT11 are larger than the first antenna group 1 and the second antenna group 2, and are mainly used to assist in providing better multi-input multi-output communication performance. For example, when the first antenna group 1 is used for a multi-input multi-output antenna, the first antenna group 1 and the third antenna group 3 are both multi-input multi-output antennas of 2.4 GHz and 5 GHz, so that a total of six antennas can be used. When the second antenna group 2 is a multi-input multi-output antenna of 6 GHz, the second antenna group 2 and the third antenna group 3 are both multi-input multi-output antennas of 6 GHz, so that a total of six antennas can be used.

[0058] Furthermore, the single-frequency antenna ANT9 is vertically arranged on the base surface BS, preferably near the center of the base surface BS, but not limited to the center, and may be offset. This single-frequency antenna is a 2.4GHz omnidirectional antenna. Since it is an omnidirectional antenna, it does not need to have a field design function, as long as it meets the horizontal omnidirectionality. In conjunction with the above three antenna groups and the single-frequency antenna ANT9, it can provide radiation field coverage in various directions and a variety of multi-input and multi-output applications.

[0059] To sum up, the multi-antenna for wireless local area network provided by the embodiment of the present invention can not only be applied to 2.4GHz, 5GHz and 6GHz frequency bands, but also can be used to realize a variety of different multi-input multi-output application combinations. The eight-leaf branch can achieve the effect of radiation field design, and the present invention can achieve the effect of multi-antenna integration and reduction of occupied space, and has high industrial application value.

Claims

1. A multi-antenna for a wireless local area network, characterized in that: The multi-antenna for wireless local area network is arranged on the surface of the base in the wireless access point, and includes: A first antenna group includes four dual-frequency antennas; wherein the four dual-frequency antennas are dual-frequency antennas operating at 2.4 GHz and 5 GHz, and the four dual-frequency antennas are respectively close to four edges of the surface of the base; The second antenna group is a 6 GHz antenna group, having four printed circuit board antennas, the four printed circuit board antennas are horizontally placed on the surface of the base, and the four printed circuit board antennas are respectively close to four edges of the surface of the base, and each of the printed circuit board antennas has an eight-leaf branch; The third antenna group includes two tri-band antennas operating in three frequency bands including 2.4 GHz, 5 GHz and 6 GHz; and Single-band antenna, 2.4GHz omnidirectional antenna.

2. The multi-antenna for wireless local area network according to claim 1, characterized in that: Each of the printed circuit board antennas includes a double-sided substrate, a first antenna body and a second antenna body, the double-sided substrate has an upper surface and a lower surface, the first antenna body is arranged on the upper surface, and the second antenna body is arranged on the lower surface; Wherein, the first antenna body has four main lobe branches, the four main lobe branches are connected to a first central feed point, and the first central feed point is connected to a central conductor of a coaxial line; Wherein, the second antenna body has four secondary lobe branches, the four secondary lobe branches are connected to the second central feed point, and the second central feed point is connected to the outer conductor of the coaxial line; The four main leaf branches correspond to the four secondary leaf branches in one-to-one correspondence, so as to jointly constitute the eight leaf branches; Among them, the four main leaf branches are radially distributed with the first central feed point as the center, and the four main leaf branches are distributed around the first central feed line with an angle difference of ninety degrees; wherein the four secondary leaf branches are radially distributed with the second central feed point as the center, and the four secondary leaf branches are distributed around the second central feed line with an angle difference of ninety degrees.

3. The multi-antenna for wireless local area network according to claim 2, characterized in that: Each of the main leaf branches is composed of a main extension section and a main blade segment, wherein the main extension section is connected between the first central feed point and the main blade segment, wherein a first end of the main blade segment is connected to the main extension section, and a second end of the main blade segment extends in a direction perpendicular to the main extension section; Each of the auxiliary leaf branches is composed of an auxiliary extension section and an auxiliary blade section, wherein the auxiliary extension section is connected between the second central feed point and the auxiliary blade section, wherein the first end of the auxiliary blade section is connected to the auxiliary extension section, and the second end of the auxiliary blade section extends in a direction perpendicular to the auxiliary extension section; Wherein, in the horizontal projection of the double-sided substrate, the main extension section and the corresponding secondary extension section overlap each other; Wherein, in the horizontal projection of the double-sided substrate, the extension direction of the main fan blade segment and the extension direction of the corresponding auxiliary fan blade segment are away from each other; Among them, from the perspective of the upper surface, when the extension direction of the main fan blade segment is counterclockwise, the extension direction of the auxiliary fan blade segment is clockwise; from the perspective of the upper surface, when the extension direction of the main fan blade segment is clockwise, the extension direction of the auxiliary fan blade segment is counterclockwise.

4. The multi-antenna for wireless local area network according to claim 3, characterized in that: For one of the four printed circuit board antennas, the main blade section extends in a counterclockwise direction, and for another one of the four printed circuit board antennas, the main blade section extends in a clockwise direction.

5. The multi-antenna for wireless local area network according to claim 3, characterized in that: The main extension section has a rectangular widened portion, and the rectangular widened portion is adjacent to the corresponding main blade section; wherein the rectangular widened portion is used to adjust impedance matching.

6. The multi-antenna for wireless local area network according to claim 5, characterized in that: The main extension section has a field pattern adjustment portion, and the field pattern adjustment portion is used to adjust the radiation field pattern.

7. The multi-antenna for wireless local area network according to claim 1, characterized in that: The four dual-band antennas are planar inverted F-shaped antennas made of all metal and are uprightly arranged on the surface of the base; wherein the single-band antenna is uprightly arranged on the surface of the base; wherein the two triple-band antennas are horizontally placed on the surface of the base.

8. The multi-antenna for wireless local area network according to claim 1, characterized in that: The first antenna group and the third antenna group are both 2.4 GHz and 5 GHz multiple-input multiple-output antennas.

9. The multi-antenna for wireless local area network according to claim 1, characterized in that: The second antenna group is a 6 GHz multiple-input multiple-output antenna.

10. The multi-antenna for wireless local area network according to claim 1, characterized in that: The second antenna group and the third antenna group are both 6 GHz multiple-input multiple-output antennas.

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