Dual-polarized and dual-band base station antenna and array based on decoupling surfaces and septums

Abstract

The application discloses a kind of based on decoupling surface and isolation plate's dual polarization and double frequency base station antenna and array, the base station antenna includes low frequency antenna array, high frequency antenna array, antenna floor and multiple first isolation plate being arranged in antenna floor, multiple second isolation plate being arranged in the middle of adjacent two first isolation plate;High frequency antenna array includes multiple columns of high frequency antenna unit column being installed in the middle of adjacent first isolation plate and second isolation plate;Low frequency antenna array includes multiple columns of low frequency antenna unit column being installed in the middle of adjacent two first isolation plate;Each column of low frequency antenna unit column includes multiple low frequency antenna units printed with decoupling surface, decoupling surface includes 8 several Chinese character shape metal strip, 180 square metal patch and 40 rectangular metal patch.Not only solve the problem of low frequency antenna to high frequency antenna's shelter, repair high frequency antenna pattern, but also can effectively improve low frequency antenna and high frequency antenna's same frequency isolation, improve decoupling effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, in particular to a dual-polarized and dual-frequency base station antenna and array based on a decoupling surface and a separation plate. BACKGROUND

[0002] With the continuous evolution of mobile communication technology, the design of base station antennas is facing multi-dimensional technical challenges such as bandwidth expansion and device miniaturization, aiming to meet the increasingly complex and diversified communication needs. In today's communication scenarios, integrating antennas of different frequency bands, such as 2G, 3G, and 4G base station antennas, into the same radiation aperture can improve the space utilization of base stations and reduce costs.

[0003] However, in the actual design of a dual-frequency co-aperture antenna array, the complex electromagnetic environment can lead to a series of technical problems. The shielding of low-frequency antennas can affect the radiation performance of high-frequency antennas, resulting in technical problems such as pattern distortion and gain reduction, which seriously restricts the overall performance of the antenna. At the same time, in the antenna array architecture, the mutual coupling effect between antenna elements cannot be avoided, which directly leads to a decrease in antenna port isolation, thereby affecting the quality and stability of signal transmission. SUMMARY

[0004] The purpose of the present application is to at least solve one of the technical problems existing in the prior art, to provide a dual-polarized and dual-frequency base station antenna and array based on a decoupling surface and a separation plate, which not only solves the problem of low-frequency antenna shielding high-frequency antenna, but also repairs the high-frequency antenna pattern, and effectively improves the same frequency isolation of low-frequency antenna and high-frequency antenna, and improves the decoupling effect.

[0005] The first aspect of the present application provides a dual-polarized and dual-frequency base station antenna based on a decoupling surface and a separation plate, comprising a low-frequency antenna array, a high-frequency antenna array, an antenna floor, and a plurality of first separation plates arranged on the antenna floor, a plurality of second separation plates arranged between adjacent two first separation plates; the high-frequency antenna array comprises a plurality of high-frequency antenna element columns installed between adjacent first separation plates and second separation plates; the low-frequency antenna array comprises a plurality of low-frequency antenna element columns installed between adjacent two first separation plates; each column of low-frequency antenna element columns comprises a plurality of low-frequency antenna elements printed with a decoupling surface, and the decoupling surface comprises 8 metal bars in the shape of a Chinese character, 180 square metal patches, and 40 rectangular metal patches.

[0006] The dual-polarized and dual-frequency base station antenna based on a decoupling surface and a separation plate provided by the present application has at least the following beneficial effects:

[0007] By printing the decoupling surface on the low-frequency antenna unit, and using the multiple Z-shaped metal strips arranged on the decoupling surface to offset part of the coupling current, and arranging multiple square and rectangular metal sheets to adjust the working bandwidth of the decoupling surface, the problem of shielding of the low-frequency antenna to the high-frequency antenna is solved without adding additional dielectric plates, and the high-frequency antenna pattern is repaired. At the same time, by arranging multiple first isolation plates between the multiple columns of high-frequency antenna unit columns, the high-frequency antenna co-polarization coupling wave can be converted into an extra-polarization coupling wave, the co-frequency isolation of the high-frequency antenna is improved, and by arranging multiple second isolation plates between the multiple columns of low-frequency antenna unit columns, the coupling wave intensity of adjacent low-frequency antennas can be controlled, and the co-frequency isolation of the low-frequency antenna is improved, so that the decoupling effect is improved without affecting the normal radiation performance of the antenna unit.

[0008] According to some embodiments of the application, the number of high-frequency antenna unit columns is four, and the number of low-frequency antenna unit columns is two, and the high-frequency antenna unit columns and the low-frequency antenna unit columns are arranged in parallel between each column.

[0009] According to some embodiments of the application, each column of high-frequency antenna unit columns includes four high-frequency antenna units, and each column of low-frequency antenna unit columns includes two low-frequency antenna units, and each low-frequency antenna unit is provided with high-frequency antenna units at four corners respectively.

[0010] According to some embodiments of the application, the low-frequency antenna unit includes a first dielectric plate, and the upper surface of the first dielectric plate is printed with the decoupling surface, and the lower surface of the first dielectric plate is printed with a low-frequency antenna.

[0011] According to some embodiments of the application, it further includes multiple low-frequency metal isolation strips arranged in the middle and on both sides of the two columns of low-frequency antenna unit columns.

[0012] According to some embodiments of the application, it further includes multiple third isolation plates arranged in parallel in the middle and on both sides of the antenna floor respectively, and each third isolation plate is fixedly installed with two low-frequency metal isolation strips respectively.

[0013] According to some embodiments of the application, the number of first isolation plates is two, and each first isolation plate is arranged in parallel in the middle of two adjacent third isolation plates, and each first isolation plate is provided with multiple notched structures.

[0014] According to some embodiments of the application, the number of second isolation plates is two, and the second isolation plate includes a second dielectric plate, and the upper surface of the second dielectric plate is printed with 9 periodic structures, and the periodic structure includes a cross-shaped metal strip and 4 L-shaped metal strips, and the 4 L-shaped metal strips are surrounded outside the cross-shaped metal strip.

[0015] According to some embodiments of the present application, a plurality of high-frequency metal isolation strips are arranged between two adjacent high-frequency antenna units, the high-frequency metal isolation strips include vertical metal strips and metal bases, and the metal bases are provided with a group of fixing holes.

[0016] The second aspect of the present application provides a base station antenna array, including the dual-polarized and dual-frequency base station antenna based on the decoupling surface and the isolation plate as described in the first aspect of the present application.

[0017] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structure particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solutions of the present application, and do not constitute a limitation on the technical solutions of the present application.

[0019] The present application will be further described below in conjunction with the drawings and embodiments.

[0020] Figure 1 is a structural schematic diagram of the dual-polarized and dual-frequency base station antenna based on the decoupling surface and the isolation plate provided by the embodiments of the present application;

[0021] Figure 2 is a port schematic diagram of the dual-polarized and dual-frequency base station antenna based on the decoupling surface and the isolation plate provided by the embodiments of the present application;

[0022] Figure 3 is a decoupling surface structural schematic diagram provided by the embodiments of the present application;

[0023] Figure 4 is a low-frequency antenna unit structural schematic diagram provided by the embodiments of the present application;

[0024] Figure 5 is a high-frequency antenna unit structural schematic diagram provided by the embodiments of the present application;

[0025] Figure 6 is a first isolation plate structural schematic diagram provided by the embodiments of the present application;

[0026] Figure 7 is a low-frequency metal isolation strip structural schematic diagram provided by the embodiments of the present application;

[0027] Figure 8 is a high-frequency metal isolation strip structural schematic diagram provided by the embodiments of the present application;

[0028] Figure 9 is a second isolation plate structure schematic diagram provided by an embodiment of the present application;

[0029] Figure 10 is an antenna floor structure schematic diagram provided by an embodiment of the present application;

[0030] Figure 11 is a simulation result diagram of S parameters of a low-frequency antenna unit varying with frequency provided by an embodiment of the present application;

[0031] Figure 12 is a simulation result diagram of peak gain of a low-frequency antenna unit varying with frequency provided by an embodiment of the present application;

[0032] Figure 13 is a simulation result diagram of horizontal plane patterns of a low-frequency antenna unit at 690MHz, 780MHz and 870MHz provided by an embodiment of the present application;

[0033] Figure 14 is a simulation result diagram of co-frequency port isolation of a low-frequency antenna varying with frequency provided by an embodiment of the present application;

[0034] Figure 15 is a simulation result diagram of standing wave ratio of a high-frequency antenna unit varying with frequency provided by an embodiment of the present application;

[0035] Figure 16 is a simulation result diagram of column peak gain of a high-frequency antenna unit varying with frequency provided by an embodiment of the present application;

[0036] Figure 17 is a simulation result diagram of horizontal plane patterns of a high-frequency antenna unit column at 1.69GHz, 2.19GHz and 2.69GHz provided by an embodiment of the present application;

[0037] Figure 18 is a simulation result diagram of co-frequency port isolation of a high-frequency antenna varying with frequency provided by an embodiment of the present application.

[0038] The figure marks: decoupling surface 1, several-shaped metal strips 2, square metal patches 3, rectangular metal patches 4, first isolation plate 5, notched structure 6, high-frequency metal isolation strips 7, vertical metal strips 8, metal base 9, fixing holes 10, second isolation plate 11, low-frequency metal isolation strips 12, antenna floor 13, first via holes 14, second via holes 15, third isolation plate 16, low-frequency antenna unit 17, high-frequency antenna unit 18, periodic structure 20, cross-shaped metal strips 21, L-shaped metal strips 22. DETAILED DESCRIPTION

[0039] The specific embodiments of the present application will be described in detail below, the preferred embodiments of the present application are shown in the drawings, the role of the drawings is to supplement the description of the text part of the description, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the present application, but it cannot be understood as a limitation on the protection scope of the present application.

[0040] In the description of the present application, one or more is the meaning of several, the meaning of multiple is more than two, greater than, less than, more than, etc. is understood as not including the number, above, below, within, etc. is understood as including the number, "any one" means one or more, "at least one of the following" and similar expressions mean any combination of these items, including any combination of single or multiple items. If the first, second is described, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0041] It should be noted that the words such as setting, installing and connecting in the embodiments of the present application should be understood broadly, and those skilled in the art can reasonably determine the specific meaning of the above words in the embodiments of the present application in combination with the specific content of the technical scheme. For example, the term "connection" can be mechanical connection, electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium.

[0042] It should be noted that the technical features involved in each embodiment of the present application described below can be combined with each other as long as there is no conflict between them.

[0043] With the continuous evolution of mobile communication technology, the design of base station antennas is facing multi-dimensional technical challenges such as bandwidth expansion and device miniaturization, aiming to meet the increasingly complex and diversified communication needs. In today's communication scenarios, integrating antennas of different frequency bands, such as 2G, 3G and 4G base station antennas, in the same radiation aperture can improve the space utilization of base stations and reduce costs.

[0044] However, in the actual design of the dual-frequency common-aperture antenna array, the complex electromagnetic environment can derive a series of technical problems. The shielding of low-frequency antennas can affect the radiation performance of high-frequency antennas, thereby causing technical problems such as pattern distortion and gain reduction, which seriously restricts the overall performance of the antenna. At the same time, in the antenna array architecture, the mutual coupling effect between antenna units is difficult to avoid, which directly leads to the decline of antenna port isolation, and further affects the quality and stability of signal transmission.

[0045] Based on this, the embodiment of the present application provides a dual-polarized and dual-frequency base station antenna and array based on a decoupling surface and an isolation plate, which not only solves the problem of shielding of a low-frequency antenna to a high-frequency antenna and repairs the high-frequency antenna pattern, but also effectively improves the co-frequency isolation of the low-frequency antenna and the high-frequency antenna and improves the decoupling effect.

[0046] The embodiment of the present application is further described below with reference to the drawings.

[0047] Referring to Figure 1 , Figure 1 is a structural schematic diagram of a dual-polarized and dual-frequency base station antenna based on a decoupling surface 1 and an isolation plate provided by an embodiment of the present application. In some embodiments of the present application, the base station antenna includes a low-frequency antenna array, a high-frequency antenna array, an antenna floor 13, a plurality of first isolation plates 5 arranged on the antenna floor 13, and a plurality of second isolation plates 11 arranged between adjacent two first isolation plates 5; the high-frequency antenna array includes a plurality of high-frequency antenna element columns installed between adjacent first isolation plates 5 and second isolation plates 11; the low-frequency antenna array includes a plurality of low-frequency antenna element columns installed between adjacent two first isolation plates 5; each column of low-frequency antenna element columns includes a plurality of low-frequency antenna elements 17 printed with a decoupling surface 1, and the decoupling surface 1 includes eight U-shaped metal strips 2, 180 square metal patches 3 and 40 rectangular metal patches 4.

[0048] According to the dual-polarized and dual-frequency base station antenna based on the decoupling surface 1 and the isolation plate provided by the embodiment of the present application, the decoupling surface 1 is printed on the low-frequency antenna element 17, and the multiple U-shaped metal strips 2 arranged on the decoupling surface 1 are used to offset part of the coupling current, and multiple square and rectangular metal patches are arranged to adjust the working bandwidth of the decoupling surface 1, thereby solving the problem of shielding of the low-frequency antenna to the high-frequency antenna without increasing additional dielectric plates, and repairing the high-frequency antenna pattern. At the same time, the multiple first isolation plates 5 arranged between the multiple high-frequency antenna element columns can convert the high-frequency antenna co-polarization coupling wave into a cross-polarization coupling wave, improve the co-frequency isolation of the high-frequency antenna, and the multiple second isolation plates 11 arranged between the multiple low-frequency antenna element columns can control the coupling wave intensity of adjacent low-frequency antennas and improve the co-frequency isolation of the low-frequency antenna, thereby improving the decoupling effect without affecting the normal radiation performance of the antenna element.

[0049] Referring to Figure 1 and Figure 2In some embodiments of the present application, the number of high-frequency antenna unit columns is four, and the number of low-frequency antenna unit columns is two, and each column of high-frequency antenna unit columns and low-frequency antenna unit columns is arranged in parallel. It can be understood that the high-frequency and low-frequency antenna unit columns can be arranged alternately on the antenna floor 13 at a certain interval to form a regular array structure. In the feeding system, the high-frequency antenna unit columns are connected to the high-frequency feeder, and the low-frequency antenna unit columns are connected to the low-frequency feeder, and the feeder transmits signals to the antenna control unit to realize signal transmission and reception. Further, the high-frequency antenna array can specifically include four high-frequency antenna unit columns, and the low-frequency antenna array can specifically include two low-frequency antenna unit columns, and each column of high-frequency antenna unit columns and low-frequency antenna unit columns is arranged and installed in parallel, which can effectively improve the space utilization of the antenna array, so that multiple antenna units of different frequency bands can be accommodated in a limited space at the same time, thereby meeting the demand for multi-band communication.

[0050] With reference to Figure 1 , Figure 2 , Figure 4 and Figure 5 In some embodiments of the present application, each column of high-frequency antenna unit columns includes four high-frequency antenna units 18, and each column of low-frequency antenna unit columns includes two low-frequency antenna units 17, and each low-frequency antenna unit 17 is provided with a high-frequency antenna unit 18 at each corner. It should be noted that on the antenna floor 13, each column of high-frequency antenna unit columns can specifically include four high-frequency antenna units 18, and each column of low-frequency antenna unit columns can specifically include two low-frequency antenna units 17, and each low-frequency antenna unit 17 is provided with a high-frequency antenna unit 18 at each corner, i.e. four high-frequency antenna units 18 are arranged around a low-frequency antenna unit 17 as the center, which can effectively utilize the space and improve the overall integration of the antenna array, while improving the problem of low-frequency antenna shielding high-frequency antenna.

[0051] With reference to Figures 1 to 4 In some embodiments of the present application, the low-frequency antenna unit 17 includes a first dielectric plate, and a decoupling surface 1 is printed on the upper surface of the first dielectric plate, and a low-frequency antenna is printed on the lower surface of the first dielectric plate. It can be understood that by printing the decoupling surface 1 on the upper surface of the first dielectric plate, for example, printing the decoupling surface 1 on the upper surface of the low-frequency antenna radiation dielectric plate, the mutual coupling between the low-frequency antenna and the high-frequency antenna unit 18 can be effectively reduced, the gain of the high-frequency antenna can be restored, and the distortion of the high-frequency antenna pattern can be repaired. On the lower surface of the first dielectric plate, a low-frequency antenna is printed, which is responsible for transmitting and receiving low-frequency signals, can effectively utilize the space, and make the antenna unit more compact, without the need for additional dielectric plates, thereby reducing the cost.

[0052] With reference to Figure 1 , Figure 2 and Figure 7In some embodiments of the present application, a plurality of low-frequency metal isolation strips 12 are arranged in the middle and on both sides of the two columns of low-frequency antenna unit columns. It should be noted that by arranging two low-frequency metal isolation strips 12 in the middle of the two columns of low-frequency antenna unit columns, the coupling wave between adjacent low-frequency antenna units 17 can be blocked. Further, by arranging two low-frequency metal isolation strips 12 on both sides of the two columns of low-frequency antenna unit columns, the additional coupling wave generated by the two low-frequency metal isolation strips 12 in the middle of the low-frequency antenna unit columns can be cancelled.

[0053] In an embodiment, the low-frequency metal isolation strips 12 can be made of aluminum material, which helps to reduce the overall weight of the antenna, facilitates the installation and transportation of the antenna, and reduces the manufacturing cost of the antenna.

[0054] Referring to Figure 1 , Figure 2 and Figure 7 , in some embodiments of the present application, a plurality of third isolation plates 16 are arranged in parallel in the middle and on both sides of the antenna floor 13, and each third isolation plate 16 is fixedly installed with two low-frequency metal isolation strips 12. It can be understood that the third isolation plates 16 are arranged in the middle and on both sides of the antenna floor 13, for example, a total of three third isolation plates 16 can be arranged on the entire antenna floor 13. Further, each third isolation plate 16 can be installed with two low-frequency metal isolation strips 12, for example, the low-frequency metal isolation strips 12 can be fixedly connected to the third isolation plate 16 by mechanical fixation, such as screws, buckles or adhesives, which can cancel the coupling wave between the low-frequency antenna units 17, thereby improving the co-frequency isolation of the low-frequency antenna and the high-frequency antenna and enhancing the performance of the antenna.

[0055] Referring to Figure 1 , Figure 2 and Figure 6 , in some embodiments of the present application, the number of first isolation plates 5 is two, which are arranged in parallel in the middle of each two adjacent third isolation plates 16, and each first isolation plate 5 is provided with a plurality of notched structures 6. It should be noted that the third isolation plates 16 installed on the antenna floor 13 are arranged at a certain interval, and two first isolation plates 5 are arranged in parallel between each two adjacent third isolation plates 16, which can reduce the mutual interference between the low-frequency antenna units 17 and the high-frequency antenna units 18. Further, by providing a plurality of notched structures 6 on each first isolation plate 5, the influence on the high-frequency antenna can be reduced, and the first isolation plate 5 can convert the co-polarization coupling wave of the high-frequency antenna into the cross-polarization coupling wave, thereby improving the co-frequency isolation of the high-frequency antenna.

[0056] In an embodiment, the first isolation plate 5 can be made of aluminum material, which helps to reduce the overall weight of the antenna, facilitates the installation and transportation of the antenna, and reduces the manufacturing cost of the antenna.

[0057] Referring to Figure 1 , Figure 2 and Figure 9 , in some embodiments of the present application, the number of second isolation plates 11 is two, and the second isolation plate 11 comprises a second dielectric plate, and the upper surface of the second dielectric plate is printed with 9 periodic structures 20, and the periodic structure 20 comprises a cross-shaped metal strip 21 and 4 L-shaped metal strips 22 surrounding the cross-shaped metal strip 21. It can be understood that, as shown in Figure 1 , the second isolation plate 11 arranged between the low-frequency antenna element columns can be provided with two, and the two second isolation plates 11 are arranged in a longitudinal arrangement in the middle of the two low-frequency antenna element columns and above the high-frequency antenna element 18. Further, the upper surface of the second dielectric plate is printed with 9 periodic structures 20, as shown in Figure 9 , and each periodic structure 20 can be provided with 4 L-shaped metal strips 22 surrounding a cross-shaped metal strip 21. Since the second isolation plate 11 has a bandpass characteristic in the high-frequency band, it can ensure that the second isolation plate 11 does not affect the normal operation of the high-frequency antenna. In addition, since the second isolation plate 11 has a band-stop characteristic in the low-frequency band, the number of periodic structures 20 in the second isolation plate 11 can be adjusted to control the coupling wave intensity of adjacent low-frequency antennas, thereby improving the co-frequency isolation of the low-frequency antenna.

[0058] In an embodiment, the second dielectric plate can be made of FR4 material with a thickness of 1 mm, which not only ensures sufficient electromagnetic shielding effect, but also has good mechanical strength and flexibility, and can effectively reduce the manufacturing cost of the antenna.

[0059] Referring to Figure 1 , Figure 2 and Figure 8 , in some embodiments of the present application, a plurality of high-frequency metal isolation strips 7 are arranged between adjacent two high-frequency antenna elements 18, and the high-frequency metal isolation strip 7 comprises a vertical metal strip 8 and a metal base 9, and the metal base 9 is provided with a group of fixing holes 10. It should be noted that by arranging the high-frequency metal isolation strip 7 between the adjacent two high-frequency antenna elements 18, and the high-frequency metal isolation strip 7 is composed of the vertical metal strip 8 and the metal base 9, the vertical metal strip 8 is vertically installed on the metal base 9 to provide electromagnetic shielding in the vertical direction, and the metal base 9 is used to support the vertical metal strip 8, and a group of fixing holes 10 are provided on the metal base 9, for example, a group can include 2 fixing holes 10, so as to fix the high-frequency metal isolation strip 7 on the antenna floor 13 by using screws, bolts and other fasteners, thereby directly blocking the coupling path between the high-frequency antennas by using the high-frequency metal isolation strip 7, and improving the co-frequency isolation of the high-frequency antenna.

[0060] In an embodiment, the vertical metal strips 8 can be long strips or other specific shapes of metal sheets. In another embodiment, the metal base 9 and the vertical metal strips 8 can be integrally processed from the same piece of metal material (such as aluminum, copper, etc.), ensuring that the high-frequency metal isolation strip 7 has good electrical connection and mechanical strength.

[0061] Referring to Figure 1 and Figure 10 In some embodiments of the present application, the antenna floor 13 is provided with a plurality of first vias 14 and a plurality of second vias 15, respectively providing independent feeding paths for the high-frequency antenna units 18 and the low-frequency antenna units 17, ensuring efficient transmission of signals to the corresponding antenna units, reducing signal interference and loss. Specifically, as shown in Figure 5 and Figure 10 The first via 14 is used for feeding the high-frequency antenna unit 18, and therefore can be designed to be small in size to accommodate the small diameter of the high-frequency feed line, and the number of first vias 14 is the same as the number of high-frequency antenna units 18, for example, 16 first vias 14 can be provided in the antenna floor 13 corresponding to the 16 high-frequency antenna units 18 in the above embodiment, and then the signal is transmitted to the high-frequency antenna unit 18 through the high-frequency feed line passing through the first via 14. Further, as shown in Figure 4 and Figure 10 The second via 15 is used for feeding the low-frequency antenna unit 17, and therefore can be designed to be large in size to accommodate the thick diameter of the low-frequency feed line, and the number of second vias 15 is the same as the number of low-frequency antenna units 17, for example, 4 second vias 15 can be provided in the antenna floor 13 corresponding to the 4 low-frequency antenna units 17 in the above embodiment, and then the signal is transmitted to the low-frequency antenna unit 17 through the low-frequency feed line passing through the second via 15.

[0062] In some embodiments of the present application, the base station antenna further comprises a radome, which can be installed on the antenna floor 13 or other antenna housing structure in a mechanical fixing manner (such as screws, buckles or adhesives). Further, the dielectric material of the radome can use Megtron4S_R5725S material with a thickness of 2.6 millimeters, which not only effectively protects the antenna from environmental factors, but also ensures efficient transmission of electromagnetic waves and improves the overall performance and reliability of the antenna.

[0063] As shown in Figure 11 , Figure 11 is a simulation result graph of the low-frequency antenna unit S parameter of the embodiment of the present application varying with frequency, and the working frequency band of the low-frequency antenna is 690-960MHz. The simulated return loss is less than -10dB within the working bandwidth, and the simulated port isolation is less than -20dB.

[0064] As shown in Figure 12 ,Figure 12 is a simulation result diagram of the peak gain of the low-frequency antenna unit of the embodiment of the present application varying with frequency, the working frequency band of the low-frequency antenna is 690-960MHz, the feeding port is L1, and the average gain of the simulation is 7.2dBi.

[0065] As shown in Figure 13 , Figure 13 is a simulation result diagram of the horizontal plane pattern of the low-frequency antenna unit of the embodiment of the present application at 690MHz, 780MHz and 870MHz, the low-frequency antenna has a clear main lobe direction on the horizontal plane pattern, and has good frequency characteristic stability in the frequency bands of 690MHz, 780MHz and 870MHz, and can maintain relatively stable pattern characteristics in a wide frequency range.

[0066] As shown in Figure 14 , Figure 14 is a simulation result diagram of the port co-polarization isolation of the low-frequency antenna of the embodiment of the present application varying with frequency, and the numerical value of the simulated port isolation is lower than -20.7dB.

[0067] As shown in Figure 15 , Figure 15 is a simulation result diagram of the standing wave ratio of the high-frequency antenna unit of the embodiment of the present application varying with frequency, the working frequency band of the high-frequency antenna is 1.69-2.69GHz, and the simulated standing wave ratio is lower than 1.63 within the working bandwidth.

[0068] As shown in Figure 16 , Figure 16 is a simulation result diagram of the column peak gain of the high-frequency antenna unit of the embodiment of the present application varying with frequency, the working frequency band of the high-frequency antenna is 1.69-2.69GHz, the feeding ports are H1, H5, H9 and H11, and the average gain of the simulation is 15dBi.

[0069] As shown in Figure 17 , Figure 17 is a simulation result diagram of the horizontal plane pattern of the high-frequency antenna unit of the embodiment of the present application at 1.69GHz, 2.19GHz and 2.69GHz, the high-frequency antenna has a clear main lobe direction on the horizontal plane pattern, and has consistent performance at the three frequency points of 1.69GHz, 2.19GHz and 2.69GHz, showing good frequency characteristic stability and pattern stability.

[0070] As shown in Figure 18 , Figure 18 is a simulation result diagram of the port co-polarization isolation of the high-frequency antenna of the embodiment of the present application varying with frequency, and the numerical value of the simulated port isolation is lower than -20dB.

[0071] It should be noted that, compared with other dual-frequency base station antenna arrays, the dual-polarized and dual-frequency base station antenna (hereinafter referred to as base station antenna) based on the decoupling surface and the isolation plate of the embodiment of the application uses the decoupling surface to repair the shielding effect of the low-frequency antenna on the high-frequency antenna, and realizes the high-frequency antenna pattern shape without increasing additional dielectric plates; the base station antenna of the embodiment of the application uses the first isolation plate and the high-frequency metal isolation strip to improve the co-frequency isolation degree of the high-frequency antenna without affecting the radiation performance of the high-frequency antenna unit; the base station antenna of the embodiment of the application uses the second isolation plate and the low-frequency metal isolation strip to improve the co-frequency isolation degree of the low-frequency antenna without affecting the radiation performance of the high-frequency antenna unit; the co-frequency port isolation degree of the low-frequency antenna in the base station antenna of the embodiment of the application is greater than 20.7dB, and the co-frequency port isolation degree of the high-frequency antenna is greater than 20dB, which realizes good decoupling effect and can be applied to the base station antenna array.

[0072] The second aspect embodiment of the application provides a base station antenna array, which comprises the dual-polarized and dual-frequency base station antenna based on the decoupling surface and the isolation plate according to the first aspect embodiment.

[0073] The above describes the embodiments of the application in detail in combination with the drawings, but the application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application.

Claims

1. A dual-polarization and dual-frequency base station antenna based on a decoupling surface and an isolation plate, characterized in that, It includes a low-frequency antenna array, a high-frequency antenna array, an antenna floor, and a plurality of first isolation plates disposed on the antenna floor, and a plurality of second isolation plates disposed between two adjacent first isolation plates; The high-frequency antenna array includes multiple columns of high-frequency antenna elements installed on both sides of the first isolation plate, and each column of the high-frequency antenna elements includes four high-frequency antenna elements. The low-frequency antenna array includes multiple columns of low-frequency antenna elements installed on both sides of the second isolation plate; Each column of the low-frequency antenna unit includes two low-frequency antenna units printed with decoupling surfaces. Each low-frequency antenna unit has a high-frequency antenna unit at each of its four corners. The decoupling surface includes eight Z-shaped metal strips, 180 square metal patches, and 40 rectangular metal patches.

2. The dual-polarization and dual-frequency base station antenna based on a decoupling surface and isolation plate according to claim 1, characterized in that, The number of high-frequency antenna unit columns is four, and the number of low-frequency antenna unit columns is two, with each column of high-frequency antenna unit columns and each column of low-frequency antenna unit columns arranged in parallel.

3. The dual-polarization and dual-frequency base station antenna based on a decoupling surface and an isolation plate according to claim 1, characterized in that, The low-frequency antenna unit includes a first dielectric substrate, the upper surface of which is printed with the decoupling surface, and the lower surface of which is printed with a low-frequency antenna.

4. The dual-polarization and dual-frequency base station antenna based on a decoupling surface and an isolation plate according to claim 2, characterized in that, It also includes multiple low-frequency metal isolation strips disposed in the middle and on both sides of the two columns of low-frequency antenna units.

5. The dual-polarization and dual-frequency base station antenna based on a decoupling surface and an isolation plate according to claim 4, characterized in that, It also includes multiple third isolation plates that are respectively arranged in parallel in the middle and on both sides of the antenna floor, and each of the third isolation plates is fixedly installed with two of the low-frequency metal isolation strips.

6. The dual-polarization and dual-frequency base station antenna based on a decoupling surface and an isolation plate according to claim 5, characterized in that, There are two first isolation plates, which are arranged in parallel between the two adjacent third isolation plates. Each first isolation plate has multiple notch structures.

7. The dual-polarization and dual-frequency base station antenna based on a decoupling surface and an isolation plate according to claim 1, characterized in that, The number of the second isolation plates is two. The second isolation plate includes a second dielectric plate. The upper surface of the second dielectric plate is printed with nine periodic structures. The periodic structure includes a cross-shaped metal strip and four L-shaped metal strips. The four L-shaped metal strips surround the cross-shaped metal strip.

8. The dual-polarization and dual-frequency base station antenna based on a decoupling surface and an isolation plate according to claim 1, characterized in that, It also includes multiple high-frequency metal isolation strips disposed between two adjacent high-frequency antenna units. Each high-frequency metal isolation strip includes a vertical metal strip and a metal base, and the metal base has a set of fixing holes.

9. A base station antenna array, characterized in that, Includes dual-polarized and dual-band base station antennas based on decoupled surfaces and isolation plates as described in any one of claims 1 to 8.

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