CPE array antenna capable of improving antenna isolation and performance

Abstract

The invention provides a CPE array antenna capable of improving antenna isolation and performance, and belongs to the field of antenna structures. The CPE array antenna capable of improving antenna isolation and performance comprises more than two groups of antennas, all the antennas form an annular antenna array, each group of antennas comprises two antennas with identical structures, the CPE array antenna comprises two groups of antennas with identical frequency bands, the two groups of antennas comprise a first group of antennas and a second group of antennas, and the first group of antennas and the second group of antennas are identical in frequency band. The first group of antennas comprises a first antenna and a second antenna, the first antenna and the second antenna are oppositely arranged in parallel, a longitudinal vertical center line of the first antenna and the second antenna is used as a middle axial surface, the second group of antennas are symmetrically arranged on two sides of the middle axial surface, and the first group of antennas and the second group of antennas are vertically arranged; and the distance is not less than 1 / 4 wavelength. The antenna has the beneficial effects that the structure is compact, the mutual influence between antennas in the same frequency band is small, and the isolation and the performance of the antenna are effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of antenna structures, and in particular to a CPE array antenna capable of improving antenna isolation and performance. Background Art

[0002] CPE is short for Customer Premises Equipment, which is equipment located at the end user's premises, usually a telephone or other service. Common ones include telephones, cable TV set-top boxes, and digital subscriber line (DSL) routers. Due to communication requirements, the CPE equipment usually includes multiple antennas. It is inevitable that antennas with the same frequency band will be set on a CPE device at the same time. In order to avoid the influence of various antennas on each other, antennas are usually set at different positions of the CPE device, or an isolation structure is set to maximize the isolation. This structure causes the antenna to occupy too much volume and high cost. Summary of the invention

[0003] In order to solve the problems in the prior art, the present invention provides a CPE array antenna that can improve antenna isolation and performance. It is designed as a ring-shaped antenna array, and each antenna is evenly arranged on the ring, making its structure more compact, which is conducive to product miniaturization and reducing product cost.

[0004] The CPE array antenna of the present invention can improve antenna isolation and performance, including more than two groups of antennas, all of which form a circular antenna array, and each group of antennas includes two antennas with exactly the same structure, wherein the CPE array antenna includes two groups of antennas with the same frequency band, namely a first group of antennas and a second group of antennas, the first group of antennas includes a first antenna and a second antenna, the first antenna and the second antenna are arranged in parallel and opposite to each other, with the longitudinal vertical center line of the first antenna and the second antenna as the central axis plane, the second group of antennas are symmetrically arranged on both sides of the central axis plane, the first group of antennas and the second group of antennas are arranged vertically, and the distance between them is not less than 1 / 4 wavelength.

[0005] Furthermore, antenna paths are respectively arranged above the first group of antennas and the second group of antennas, and cross sections where the antenna paths of the first group of antennas and the second group of antennas are located do not intersect.

[0006] Furthermore, it also includes a third group of antennas and a fourth group of antennas whose frequencies are different from or do not intersect with the first group of antennas. The third group of antennas and the fourth group of antennas are symmetrically arranged on both sides of the central axis plane. The second group of antennas, the third group of antennas, and the fourth group of antennas are staggered and not in the same plane. Moreover, the second group of antennas, the third group of antennas, and the fourth group of antennas do not intersect with the extension lines of the plane where the first group of antennas are located, and the second group of antennas, the third group of antennas, and the fourth group of antennas do not overlap in their respective plane projections.

[0007] Furthermore, the first group of antennas are 5G antennas, including symmetrically arranged 5G main antennas and 5G diversity antennas, the second group of antennas are 5G MIMO antennas, the third group of antennas are 2.4G / 5.8G WIFI antennas, and the fourth group of antennas are 4G antennas, including 4G main antennas and 4G diversity antennas, and the 2.4G / 5.8G WIFI antennas are arranged between the 5G MIMO antennas and the 4G antennas.

[0008] Furthermore, the 5G antenna includes a first antenna PCB board, a circuit structure arranged on the front side of the first antenna PCB board, the circuit structure including a bandwidth control loop, an antenna vibrator upper arm and an antenna vibrator lower arm arranged on the periphery of the bandwidth control ring, the bandwidth control ring is arranged at one end of the first antenna PCB board, the bandwidth control ring is provided with a dividing gap toward the other end of the first antenna PCB board, the antenna vibrator upper arm and the antenna vibrator lower arm are respectively arranged on both sides of the dividing gap, the antenna vibrator upper arm is provided with a first feeding point and a groove near the dividing gap and the bandwidth control ring, the antenna vibrator lower arm is provided with a protrusion passing through the dividing gap and extending into the groove, and the protrusion is provided with a first feeding point.

[0009] Furthermore, the width of the dividing gap gradually increases toward the other end of the antenna PCB board, and an antenna frequency control block is also provided at the end of the first antenna PCB board and at a set distance from the end of the lower arm of the antenna vibrator, and the antenna frequency control block is connected to the lower arm of the antenna vibrator.

[0010] Furthermore, the 5G MIMO antenna includes a 5G MIMO3 antenna and a 5G MIMO4 antenna with the same structure, the 5G MIMO3 antenna includes a second antenna PCB board, a first radiating element and a second radiating element are provided on the second antenna PCB board, a first feeding point is provided in the middle of the first radiating element, two extension arms are provided at the end of the first radiating element away from the second radiating element, a first coupling channel is provided near the middle of the second radiating element, the feeding point is arranged at the bottom of the first coupling channel, the second radiating element is provided with an end extending to the first coupling channel, the end is provided with a second feeding point, the second radiating element is also provided with a plurality of radiating extension ends, the radiating extension ends can be coupled with the extension arms of the first radiating element to form a coupling frequency of 3 to 5 GHz, the frequencies controlled by the first radiating element and the second radiating element are superimposed on each other, and the operating frequency is set between 2000 and 5500 MHz.

[0011] Furthermore, the 2.4G / 5.8G WIFI antenna includes a third antenna PCB board, a circuit structure is provided at one end of the front side of the third antenna PCB board, the circuit structure includes an extended ground structure and an antenna frequency control structure connected to the extended ground structure, wherein a coupling gap is provided between the extended ground structure and the antenna frequency control structure, a third feeding point and a third feeding point are provided on both sides of the coupling gap, the extended ground structure includes a ground structure and an extended ground extending toward the other end of the third antenna PCB board, and a gap is provided in the middle of the extended ground and the ground structure, which is connected to each other and connected to the coupling gap.

[0012] Further, the 4G antenna includes a fourth antenna PCB board, on which a low-frequency radiation element, a high-frequency radiation element, and a coupled radiation element are provided, wherein a bandwidth extension unit is provided between the low-frequency radiation element and the coupled radiation element, a second coupling channel is provided in the middle of the coupled radiation element, a fourth feeding point is provided at the bottom of the second coupling channel, one end of the high-frequency radiation element extends into the second coupling channel, and a fourth feeding point corresponding to the fourth feeding point is provided at the front end, the coupled radiation units are symmetrically distributed on the front and back sides of the fourth antenna PCB board, and a plurality of conducting holes that conduct the front and back sides of the fourth antenna PCB board are evenly provided on the coupled radiation unit.

[0013] Furthermore, it also includes an annular fixing structure, on which mounting positions corresponding to the antennas are provided, and four groups of eight antennas are respectively fixed on the corresponding mounting positions.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the present invention can improve the signal isolation between antennas in a limited space by vertically arranging two groups of antennas with the same frequency or overlapping frequencies, and the distance between the two groups is not less than 1 / 4 wavelength. The dual antenna symmetrical design effectively improves the signal strength and various performance indicators of the antennas.

[0015] The present invention designs the CPE array antenna into a ring-shaped antenna array, and each antenna is evenly arranged on the side wall of the ring, so that the structure is more compact, which is conducive to the miniaturization of the product and reduces the product cost. The various antennas are integrated through a fixed structure and separated from the CPE device, which is conducive to the assembly of the product and improves the assembly efficiency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the present invention or the solutions in the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 and Figure 2 This is a schematic diagram of the structure of an embodiment of the present invention;

[0018] Figure 3 A schematic diagram of the arrangement positions of antennas according to an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the 5G antenna structure;

[0020] Figure 5 This is a schematic diagram of the 5G MIMO antenna structure;

[0021] Figure 6 This is a schematic diagram of the 2.4G / 5.8G WIFI antenna structure;

[0022] Figure 7-Figure 8 This is a schematic diagram of the 4G antenna structure;

[0023] Figure 9-Figure 16 The following are curve diagrams of the test results of various antenna performances. DETAILED DESCRIPTION

[0024] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0025] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present invention may be combined with other embodiments.

[0026] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0027] like Figure 1 to Figure 3 As shown, the CPE array antenna of the present invention that can improve antenna isolation and performance includes four groups of antennas, namely, the first group of antennas composed of antenna 1 and antenna 5, the second group of antennas composed of antenna 2 and antenna 6, the third group of antennas composed of antenna 3 and antenna 7, and the fourth group of antennas composed of antenna 4 and antenna 8. In this example, the four groups of antennas form a circular antenna array, and each group of antennas includes two antennas with exactly the same structure. In this example, the antenna 1 and the antenna 5 of the first group of antennas are parallel, and the front faces of the antennas are arranged oppositely. In this example, the antenna 2 and the antenna 6 of the second group of antennas have the same frequency or partially overlap in frequency. In order to minimize mutual interference, the present invention uses the longitudinal vertical center line of the antenna 1 and the antenna 5 as the central axis plane, and the second group of antennas to the fourth group of antennas are vertically symmetrically arranged on both sides of the central axis plane.

[0028] Preferably, the second group of antennas, the third group of antennas, and the fourth group of antennas in this example are arranged in staggered layers that are not in the same plane, and the second group of antennas, the third group of antennas, and the fourth group of antennas do not intersect with the extension lines of the plane where the first group of antennas are located. The three groups of antennas in this example can be in a stepped shape, moving away from the central axis plane in sequence, or can be arranged in a manner that the third group of antennas in the middle is far away and the second group of antennas and the fourth group of antennas on both sides are close.

[0029] As an embodiment of the present invention, the four groups of antennas in this example are fixed on the annular fixing structure 9 through their ends. The annular fixing structure 9 is provided with mounting positions 901 respectively arranged corresponding to the antennas. A total of eight antennas in four groups are respectively fixed on the corresponding mounting positions 901. Preferably, the mounting positions 901 in this example are mounting slots similar to those of computer graphics cards. One ends of the eight antennas are respectively inserted into the mounting slots and fixed. The installation method is simple and convenient, and the positioning effect is good.

[0030] In this example, baffles or shells may be provided around the eight antennas below the annular fixing structure 9 to form a complete whole. A mounting structure may also be provided on the shell to achieve quick connection with the CPE device.

[0031] Of course, the installation structure of this example is not limited to the annular fixing structure 9, and the installation position can also be set on the shell, or directly fixed by screws to achieve the effect of the present invention.

[0032] As a preferred embodiment of the present invention, the eight antenna circuit boards in this example are made of PCB-FR4 material, which is stable, will not deform or bend, and is easy to assemble. During assembly, buckle positions are reserved directly on the shell material, and the PCB board can be directly buckled in the designated position without falling off.

[0033] As the third embodiment of the present invention, before the present invention is installed on the CPE device, each antenna is independent and not a whole. In this example, a mounting structure can be arranged on the CPE device. During installation, each antenna can be directly fixed at a setting position according to the mounting position of the mounting structure, and the technical effect of the present invention can also be achieved.

[0034] Of course, the present invention is not limited to four groups of antennas, and may also be set to 2 groups, 3 groups or more groups according to the communication requirements of the CPE device.

[0035] In this example, 4 groups of antennas are placed symmetrically in pairs, and 8 antennas form a circular antenna array. In addition, the paths and operating frequencies of each group of symmetrical antennas are consistent, and adjacent antennas are spaced a certain distance apart to meet the isolation requirements and not affect each other. The structure is more compact, which is conducive to the miniaturization of products and reduces product costs. The fixed structure integrates each antenna and separates it from the CPE device, which is conducive to product assembly and improves product assembly efficiency.

[0036] Due to the rapid development of 5G networks, 5G antennas are increasingly used in CPE. The antenna array in this example is also a 5G antenna array. Specifically, the first group of antennas in this example are 5G antennas, including symmetrically arranged 5G main antennas and 5G diversity antennas, the second group of antennas are 5G MIMO antennas, the third group of antennas are 2.4G / 5.8G WIFI antennas, and the fourth group of antennas are 4G antennas, including 4G main antennas and 4G diversity antennas. The 2.4G / 5.8G WIFI antennas are arranged between the 5G MIMO antennas and the 4G antennas.

[0037] In this example, the 5G MAIN (main set) antenna and the 5G DIV (diversity) antenna are placed symmetrically, and the distance between the two antennas is 79mm. This distance is much greater than their 1 / 4 wavelength, so the mutual influence is small. The 5G MAIN / DIV antenna is mainly interfered by the 5G MIMO antenna in the same frequency band. In order to reduce the interference between them and improve the isolation and antenna performance, this example is mainly optimized from the following three aspects:

[0038] 1. Place the 5G antenna and the 5G MIMO antenna at 90 degrees, because from the principle and radiation pattern of the antenna, it is best to place the two antennas at 90 degrees (the shape of the radiation pattern is similar to an apple, with no signal at the two poles), with the strongest part facing the weakest part, and the two combined to form a sphere;

[0039] 2. Optimize the structure of the two groups of antennas so that the lines constructed on the two groups of antennas are placed up and down. The 5G MAIN / DIV antenna path is placed on the top and the 5G MIMO antenna path is placed on the bottom. There is no intersection in the horizontal direction of the overall structure, which minimizes the interference between the two.

[0040] 3. The distance between the two groups of antennas meets the minimum requirement of λ / 4 (calculated at 5GMHz, λ / 4=15mm). The present invention sets the distance between the two groups to be no less than 15mm.

[0041] In this example, the 4G MAIN antenna and 4G DIV antenna are placed symmetrically, with a distance of 80.6mm between them, which is exactly λ / 4 of the low-frequency band, which improves the isolation between them and the antenna gain. The superposition of the two antennas doubles their gain. The operating frequencies of the adjacent antennas (2.4G / 5.8G WIFI antenna and 5G MAIN / DIV antenna) are staggered and staggered by a distance, so the mutual influence is small.

[0042] The 5G MIMO3 antenna and the 5G MIMO4 antenna are placed symmetrically, with a distance of 60mm between them. This distance is much greater than 1 / 4 wavelength, so the mutual influence is small. The interference of the 5G MIMO antenna mainly comes from the interference of adjacent antennas. The interference and solution between the 5G MIMO antenna and the 5G MIMO antenna have been shown above. The focus is to solve the interference with the 2.4 / 5G WiFi antenna.

[0043] Due to the compactness of the layout, the distance between each antenna is reduced as much as possible to make them evenly distributed on the ring. The distance between the 5G MIMO antenna and the 2.4 / 5.8G WiFi antenna is 9.4mm, which is not enough. Therefore, the present invention staggers the paths of these two groups of antennas in the upper and lower positions, that is, the distance between them is pulled apart in the vertical projection direction, and the circuit boards of each antenna are arranged in parallel to reduce the directional interference of each other's signals as much as possible, thereby improving their isolation and performance.

[0044] The 2.4 / 5.8G WiFi antenna and the 2.4 / 5.8G WiFi antenna are placed symmetrically, and the distance between them is 78mm, which is much greater than their 1 / 4 wavelength, so there is little impact between them.

[0045] The specific structure of each antenna is exemplified below. It should be understood that the main innovation of the present invention lies in the arrangement of the antenna array. Antennas with other structures can be arranged according to the present invention to achieve the present invention in a limited space, thereby improving the isolation capability and performance effect.

[0046] like Figure 4 As shown, the 5G antenna of this example is a single-sided design, including a first antenna PCB board, and a circuit structure arranged on the front side of the first antenna PCB board, wherein the circuit structure includes a bandwidth control loop 101, an antenna vibrator upper arm 102 and an antenna vibrator lower arm 103 arranged on the periphery of the bandwidth control loop 101, the bandwidth control loop 101 is arranged at one end of the first antenna PCB board, and the bandwidth control ring is provided with a dividing gap 107 toward the other end of the first antenna PCB board, the antenna vibrator upper arm 102 and the antenna vibrator lower arm 103 are respectively arranged on both sides of the dividing gap 107, the antenna vibrator upper arm 102 is provided with a first feeding point 105 and a groove near the dividing gap 107 and the bandwidth control ring 101, the antenna vibrator lower arm 103 is provided with a protrusion passing through the dividing gap 107 and extending into the groove, and the protrusion is provided with a first feeding point 106.

[0047] In this example, the length and width of the outer ring of the bandwidth control loop 101 are equivalent to loading an inductor on the antenna, and the size of the blank space inside the bandwidth control loop 101 is equivalent to loading a capacitor on the antenna. The combination of the two forms an "LC" circuit to control the bandwidth of the antenna.

[0048] Preferably, in this example, the width of the dividing gap gradually increases toward 107 toward the other end of the antenna PCB board, and an antenna frequency control block 104 is also provided at the end of the first antenna PCB board and at a set distance from the end of the lower arm 103 of the antenna element. The antenna frequency control block 104 is connected to the lower arm 103 of the antenna element, and a blank block 108 is provided at the end of the upper arm 102 of the antenna element at a certain distance from the antenna frequency control block 104.

[0049] The 5G antenna of the present invention needs to achieve wide bandwidth operation. It is difficult to meet the requirements by simply adjusting the bandwidth control loop 101 and the antenna frequency control block 4. The present invention optimizes the structure of the antenna vibrator upper arm 102 and the antenna vibrator lower arm 103, and sets a blank block 108, which plays a vital role in the coupling of the present invention. It can achieve more convenient and faster coupling under wide bandwidth, effectively reduce the size of the first antenna PCB board, and make the bandwidth of the present invention reach 3.5GHz when the operating frequency is in the range of 2000-5500MHz.

[0050] like Figure 5 As shown, the 5G MIMO antenna in this example includes a 5G MIMO3 antenna and a 5G MIMO4 antenna having the same structure. The MIMO3 antenna includes a second antenna PCB board, on which a first radiating element 201 and a second radiating element 202 are provided, a first feeding point 203 is provided in the middle of the first radiating element 201, an end of the first radiating element 201 away from the second radiating element 202 is provided with two extension arms 2011, 2012 extending horizontally toward the second antenna PCB board, a first coupling channel is provided near the middle of the second radiating element 202, the feeding point 203 is arranged at the bottom of the first coupling channel, the second radiating element 202 is provided with an end extending to the first coupling channel, the end is provided with a second feeding point 204, the second radiating element 202 is also provided with four radiating extension ends 2021, 2022, wherein the radiating extension end 2021 is arranged close to the first radiating element 201 and is perpendicular to the extension arms 2011, 2012, and the number of the radiating extension ends 2022 is three, which extend in opposite directions of the extension arms respectively. Among them, the middle radiation extension end is on a line with the second feeding point 204, and the other two radiation extension ends are arranged on both sides of the middle radiation extension end, and the length is set according to the coupling effect. In this example, through a specific structural setting, it can be coupled with the extension arms 2011 and 2012 of the first radiation vibrator 201 to form a coupling frequency of 3 to 5 GHz. The frequencies controlled by the first radiation vibrator 201 and the second radiation vibrator 202 are superimposed on each other, and the operating frequency is set between 2000 and 5500 MHz.

[0051] The arrangement of the two extension arms 2011 and 2012 of the present invention can effectively increase the length of the ground, and the arrangement of the radiation extension ends 2021 and 2022 of the present invention is used to change the wavelength of the antenna and control the working frequency. Since the working frequency of the 5G MIMO antenna is the same as that of the 5G antenna, if the path design is the same or similar, the two are relatively close in distance, and the directional diagrams are the same, they will interfere with each other and the isolation will be very poor. Therefore, the present invention makes the structures of the two groups of antennas completely different through structural design, and arranges the 5G MIMO antenna at one end of the second PCB board, and the line path has no intersection with the cross section of the antenna path of the 5G antenna, so that it is placed vertically, so that the difference in the path is very large, and the directional diagram will also be very different, so as to reduce the mutual interference between the antennas, improve their isolation, and improve the overall performance of the antenna.

[0052] like Figure 6 As shown, the operating frequency of the 2.4G / 5.8G WIFI antenna of this example is in two frequency bands, namely: 2400-2500MHz and 5000-5900MHz. The 2.4G / 5.8G WIFI antenna of the present invention includes a third antenna PCB board, and a circuit structure is provided at one end of the front side of the third antenna PCB board. The circuit structure includes an extended ground structure 301 and an antenna frequency control structure 302 connected to the extended ground structure 301. The antenna frequency control structure 302 is arranged in a door shape, and the extended ground structure 301 is arranged on the inner side of the antenna frequency control structure 302, wherein a coupling gap 306 is provided between the extended ground structure 301 and the antenna frequency control structure 302, and a third feeding point 305 and a third feeding point 304 are provided on both sides of the coupling gap 306, respectively.

[0053] Preferably, the extended ground structure 301 of this example includes, in addition to the ground structure provided inside the antenna frequency control structure 302 and presenting a semi-enclosed structure, an extended ground 303 extending toward the other end of the third antenna PCB board, the extended ground being connected to the side wall inside the antenna frequency control structure 302, and a gap 307 connected to each other and to the coupling gap 306 is provided in the middle of the extended ground 303 and the ground structure. The present invention can control the bandwidth of the antenna by controlling the gap 307, and can couple the antenna frequency to 5000-5900MHz by setting the coupling gap. This frequency is very high, and its wavelength is very short, and the width and length of the gap are very high. The present invention can reduce the difficulty of setting the coupling gap 306 by setting it into a semi-enclosed structure.

[0054] like Figure 7 and Figure 8As shown, the 4G antenna in this example includes a fourth antenna PCB board with a double-sided line design, and a low-frequency radiation element 401, a high-frequency radiation element 403, and a coupled radiation element 404 are provided on the fourth antenna PCB board, wherein a bandwidth extension unit 402 is provided between the low-frequency radiation element 401 and the coupled radiation element 404, a second coupling channel is provided in the middle of the coupled radiation element 404, and a fourth feeding point 407 is provided at the bottom of the second coupling channel, one end of the high-frequency radiation element 403 extends into the second coupling channel, and a fourth feeding point 408 corresponding to the fourth feeding point 407 is provided at the front end, the coupled radiation unit 404 is symmetrically distributed on the front and back sides of the fourth antenna PCB board, and on the back side of the fourth antenna PCB board, two ground structures 409 and 410 with the same structure as the front side of the fourth antenna PCB board are also included, and 8 conducting holes 405 that conduct the front and back sides of the fourth antenna PCB board are also evenly provided on the coupled radiation unit 404.

[0055] The operating frequency of the low-frequency radiation vibrator 401 of the present invention is 700-960MHz. The middle serpentine bandwidth extension unit 402, through the combination of length and gap, is equivalent to loading a group of "LC" circuits between the front and back of the low frequency, which has the function of widening the low-frequency bandwidth and controlling the frequency point, so that it can work within the specified frequency. The operating frequency of the high-frequency radiation vibrator 403 in this example is 1700-2200MHz. Its length controls the frequency band, and the gap and shape between the surrounding vibrators control the bandwidth. Through the coupling radiation vibrator 404 set on the front and back sides, the length of the ground can be increased (the antenna must be referenced to the ground, and the length of the reference ground is λ / 4), which can improve the performance of the antenna. The 8 conductive holes 405 connect the line paths on the front and back sides to form a whole.

[0056] Test verification

[0057] The CPE array antenna of the present invention, which can improve antenna isolation and performance, is set on the CPE device, and a 3D passive efficiency test is performed using a darkroom + network analyzer 5701B to test the gain and efficiency of each antenna, and then the superior effect of the present invention is explained by the antenna gain value. Antenna gain refers to: under the condition of equal input power, the ratio of the power density of the signal generated by the actual antenna and the ideal radiating unit at the same point in space. It can quantitatively describe the degree to which an antenna concentrates the input power and is used to measure the ability of the antenna to send and receive signals in a specific direction. It is one of the most important parameters for selecting base station antennas.

[0058] like Fig. 9 and Fig.10As shown, the operating frequency of the 5G antenna of the present invention is 2000-5500 MHz. The present invention selects the lowest frequency and the highest frequency band for testing. From the test results, it can be seen that the present invention has a gain in the range of 0-3db in the frequency band of 2000-2700 MHz, and a gain in the range of -1.00-6db in the high frequency band of 3300-5000 MHz.

[0059] like Figure 11-Figure 12 As shown, the operating frequency of the 5G MIMO antenna of the present invention is also 2000-5500 MHz. The present invention selects the lowest frequency and the highest frequency band for testing. From the test results, it can be seen that the present invention has a gain of 0.5-4.2 db in the frequency band of 2000-2700 MHz, and a gain of -0.5-5.5 db in the high frequency band of 3300-5000 MHz.

[0060] It can be seen from the above two results that the antenna array arrangement of the present invention can effectively avoid interference between 5G antennas and 5G MIMO antennas in the same frequency band, has good isolation, and effectively improves antenna performance.

[0061] like Fig.13 and Fig.14 As shown, the operating frequency of the 2.4G / 5.8G WIFI antenna of the present invention is 2400-2500MHz and 5000-5900MHz. The present invention tests the two frequency bands respectively. The test results show that within the 2.4G frequency band, the gain value is stable at 1db, and within the 5.8G frequency band, the gain value is between -0.5 and 3.5db.

[0062] like Figure 15-16 As shown, the operating frequency of the 4G antenna of the present invention is 700-960MHz and 1700-2200MHz. The present invention tests two frequency bands respectively. From the test results, it can be seen that in the low frequency band, the gain is in the range of -0.7-3db, and in the high frequency band, the gain is in the range of 1.2-4.8db.

[0063] It can be seen from the performance of the four groups of antennas that the array antenna of the present invention, through a unique layout, can improve the signal isolation between antennas in a limited space, and the symmetrical design of the dual antennas can effectively improve the signal strength and various performance indicators of the antennas.

[0064] The specific implementation modes described above are preferred implementation modes of the present invention, and are not intended to limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to the specific implementation modes, and all equivalent changes made according to the present invention are within the protection scope of the present invention.

Claims

1. A CPE array antenna capable of improving antenna isolation and performance, characterized in that: It includes more than two groups of antennas, all of which form a circular antenna array, and each group of antennas includes two antennas with exactly the same structure. The CPE array antenna includes two groups of antennas with the same frequency band, namely the first group of antennas and the second group of antennas. The first group of antennas includes the first antenna and the second antenna. The first antenna and the second antenna are arranged in parallel and opposite to each other, with the longitudinal vertical center line of the first antenna and the second antenna as the central axis plane, and the second group of antennas are symmetrically arranged on both sides of the central axis plane. The first group of antennas and the second group of antennas are arranged vertically, and the distance between the two is not less than 1 / 4 wavelength.

2. The CPE array antenna capable of improving antenna isolation and performance according to claim 1, characterized in that: Antenna paths are respectively arranged above the first group of antennas and the second group of antennas, and cross sections where the antenna paths of the first group of antennas and the second group of antennas are located do not intersect.

3. The CPE array antenna capable of improving antenna isolation and performance according to claim 2, characterized in that: It also includes a third group of antennas and a fourth group of antennas whose frequencies are different from or do not intersect with the first group of antennas. The third group of antennas and the fourth group of antennas are symmetrically arranged on both sides of the central axis plane. The second group of antennas, the third group of antennas, and the fourth group of antennas are staggered and not arranged in the same plane. Moreover, the second group of antennas, the third group of antennas, and the fourth group of antennas do not intersect with the extension lines of the plane where the first group of antennas are located, and the second group of antennas, the third group of antennas, and the fourth group of antennas do not overlap in their respective plane projections.

4. The CPE array antenna capable of improving antenna isolation and performance according to claim 3, characterized in that: The first group of antennas are 5G antennas, including symmetrically arranged 5G main antennas and 5G diversity antennas, the second group of antennas are 5G MIMO antennas, the third group of antennas are 2.4G / 5.8G WIFI antennas, and the fourth group of antennas are 4G antennas, including 4G main antennas and 4G diversity antennas, and the 2.4G / 5.8G WIFI antennas are arranged between the 5G MIMO antennas and the 4G antennas.

5. The CPE array antenna capable of improving antenna isolation and performance according to claim 4, characterized in that: The 5G antenna includes a first antenna PCB board, and a circuit structure arranged on the front side of the first antenna PCB board. The circuit structure includes a bandwidth control loop, an antenna vibrator upper arm and an antenna vibrator lower arm arranged on the periphery of the bandwidth control ring. The bandwidth control ring is arranged at one end of the first antenna PCB board, and the bandwidth control ring is provided with a dividing gap toward the other end of the first antenna PCB board. The antenna vibrator upper arm and the antenna vibrator lower arm are respectively arranged on both sides of the dividing gap. The antenna vibrator upper arm is provided with a first feeding point and a groove near the dividing gap and the bandwidth control ring. The antenna vibrator lower arm is provided with a protrusion passing through the dividing gap and extending into the groove, and the protrusion is provided with a first feeding point.

6. The CPE array antenna capable of improving antenna isolation and performance according to claim 5, characterized in that: The width of the dividing gap gradually increases toward the other end of the antenna PCB board. An antenna frequency control block is also provided at the end of the first antenna PCB board and at a set distance from the end of the lower arm of the antenna vibrator. The antenna frequency control block is connected to the lower arm of the antenna vibrator.

7. The CPE array antenna capable of improving antenna isolation and performance according to claim 4, characterized in that: The 5G MIMO antenna includes a 5G MIMO3 antenna and a 5G MIMO4 antenna with the same structure. The 5G MIMO3 antenna includes a second antenna PCB board. The second antenna PCB board is provided with a first radiating element and a second radiating element. A first feeding point is provided in the middle of the first radiating element. Two extension arms are provided at the end of the first radiating element away from the second radiating element. A first coupling channel is provided near the middle of the second radiating element. The feeding point is arranged at the bottom of the first coupling channel. The second radiating element is provided with an end extending to the first coupling channel. The end is provided with a second feeding point. The second radiating element is also provided with a plurality of radiating extension ends. The radiating extension ends can be coupled with the extension arms of the first radiating element to form a coupling frequency of 3 to 5 GHz. The frequencies controlled by the first radiating element and the second radiating element are superimposed on each other, and the operating frequency is set between 2000 and 5500 MHz.

8. The CPE array antenna capable of improving antenna isolation and performance according to claim 4, characterized in that: The 2.4G / 5.8G WIFI antenna includes a third antenna PCB board, a line structure is provided at one end of the front side of the third antenna PCB board, the line structure includes an extended ground structure and an antenna frequency control structure connected to the extended ground structure, wherein a coupling gap is provided between the extended ground structure and the antenna frequency control structure, a third feeding point and a third feeding point are provided on both sides of the coupling gap, the extended ground structure includes a ground structure and an extended ground extending toward the other end of the third antenna PCB board, and a gap is provided in the middle of the extended ground and the ground structure, which is connected to each other and connected to the coupling gap.

9. The CPE array antenna capable of improving antenna isolation and performance according to claim 4, characterized in that: The 4G antenna includes a fourth antenna PCB board, on which a low-frequency radiation element, a high-frequency radiation element, and a coupled radiation element are arranged, wherein a bandwidth extension unit is arranged between the low-frequency radiation element and the coupled radiation element, a second coupling channel is arranged in the middle of the coupled radiation element, a fourth feeding point is arranged at the bottom of the second coupling channel, one end of the high-frequency radiation element extends into the second coupling channel, and a fourth feeding point corresponding to the fourth feeding point is arranged at the front end, the coupled radiation units are symmetrically distributed on the front and back sides of the fourth antenna PCB board, and a plurality of conducting holes that conduct the front and back sides of the fourth antenna PCB board are evenly arranged on the coupled radiation units.

10. The CPE array antenna capable of improving antenna isolation and performance according to any one of claims 1 to 9, characterized in that: It also includes an annular fixing structure, on which mounting positions corresponding to the antennas are arranged, and four groups of eight antennas are respectively fixed on the corresponding mounting positions.

Images