Dual-frequency dual-polarized lens antenna

Abstract

The invention discloses a dual-frequency dual-polarized lens antenna which comprises a polarizer and a lens module, the relative dielectric constant of the polarizer in the first direction is different from the relative dielectric constant of the polarizer in the second direction, and the lens module is connected with the polarizer in the third direction. Wherein every two of the first direction, the second direction and the third direction are perpendicular to each other. The dual-band dual-polarization lens antenna can realize dual-band dual polarization, thereby providing hardware support for dual-band communication; according to the dual-band dual-polarized lens antenna, dual-band communication is achieved through one device, the integration degree of the device is improved, the size of the device is reduced, and the structural complexity and the use cost are reduced. The antenna is widely applied to the technical field of antennas.

Description

Technical Field

[0001] The present invention relates to the technical field of antennas, in particular to a dual-frequency dual-polarization lens antenna. Background Art

[0002] Atmospheric propagation physics shows that radio waves at certain frequencies have minimal attenuation, and communicating at these frequencies can achieve excellent wireless transmission. For example, E-band and D-band frequencies avoid the molecular absorption peaks of 60GHz, 119GHz, and 183GHz, and have a wide potential bandwidth, making them ideal for achieving extremely high data rate communications. Antennas operating in both bands can achieve dual-band simultaneous data transmission, further expanding the bandwidth and meeting the needs of extremely high data transmission rates. The E-band from 60GHz to 90GHz is expected to become the golden spectrum in the field of microwave communications in the next decade with its high capacity and low cost, as well as long-range, high-capacity, dense deployment and enhanced spectrum efficiency technology. It will lay the foundation for backhaul networks in the 5.5G and subsequent eras. Operators can use the E-band to efficiently build cost-effective 5G networks. With the continuous advancement of technology, the capacity of the E-band is expected to reach 25Gbit / s or more, meeting the requirements of 5.5G and the future. The D-band (110GHz-170GHz) is expected to become the first commercial frequency range exceeding 100GHz. With more than 30 GHz of available spectrum and advanced technologies such as MIMO, D-band links have the potential to achieve transmission rates of up to 100 Gbps within a single wireless unit. Linear polarization has advantages in this frequency band and can be optimized for specific scenarios to improve antenna performance by reducing interference between different frequency bands.

[0003] According to the above development trend, both E-band and D-band can provide support for high-speed and large-capacity communications, and each has its own advantages. If a communication device can have the communication functions of both bands, it will be able to gain greater advantages. However, if independent E-band antennas and D-band antennas are set in a communication device, it will cause problems such as large device size, complex structure and high cost. Summary of the invention

[0004] In view of the requirements of current communication technology for dual-band communication, the object of the present invention is to provide a dual-frequency dual-polarization lens antenna.

[0005] An embodiment of the present invention includes a dual-frequency dual-polarization lens antenna, and the dual-frequency dual-polarization lens antenna includes:

[0006] A polarizer; wherein the relative dielectric constant of the polarizer along the first direction is different from the relative dielectric constant along the second direction;

[0007] A lens module; the lens module is joined to the polarizer in a third direction; the first direction, the second direction and the third direction are perpendicular to each other.

[0008] Furthermore, the polarizer includes a plurality of dielectric plates, the length direction of the dielectric plates extends along the first direction, the height direction of the dielectric plates extends along the third direction, and the dielectric plates are arranged along the second direction.

[0009] Furthermore, there is an air layer between any two adjacent polarizers.

[0010] Furthermore, the lens module includes a plurality of lens units, the lens units are periodically arranged on a plane where the first direction and the second direction are located, and a height direction of the lens units extends along the third direction.

[0011] Further, any of the lens units belongs to the first type of lens unit or the second type of lens unit;

[0012] The first type of lens unit includes a first solid square column, a first cavity and a second cavity are provided inside the first solid square column, the first cavity is connected to the second cavity, the bottom area of ​​the first cavity is larger than the bottom area of ​​the second cavity, the first cavity is located on a side close to the polarizer, and the second cavity is located on a side away from the polarizer.

[0013] Furthermore, the first type of lens unit includes a second solid square column and a third solid square column, the top surface of the second solid square column is connected to the bottom surface of the third solid square column, the bottom surface area of ​​the second solid square column is larger than the bottom surface area of ​​the third solid square column, the second solid square column is located on a side close to the polarizer, and the third solid square column is located on a side away from the polarizer.

[0014] Further, in the lens module, all of the lens units are lens units of the first type, or all of the lens units are lens units of the second type, or some of the lens units are lens units of the first type and some of the lens units are lens units of the second type.

[0015] Furthermore, the phase compensation generated by the lens unit satisfies:

[0016]

[0017] in, is numbered ij and located at (x ij ,y ij ) of the lens unit, xij is the coordinate of the lens unit in the first direction, y ij is the coordinate of the lens unit in the second direction, point is the design frequency point of the dual-frequency dual-polarization lens antenna, and f point is the frequency corresponding to the design frequency point, c is the speed of light, F is the design focal length of the lens module, DP point is the reference phase corresponding to the design frequency point.

[0018] Furthermore, the phase compensation generated by the lens unit satisfies:

[0019]

[0020] in A phase delay is provided for the lens unit.

[0021] Furthermore, the design frequency point is 75G, 85G, 135G or 145G.

[0022] The beneficial effects of the present invention are as follows: the dual-frequency dual-polarization lens antenna in the embodiment can realize dual-frequency dual polarization, thereby providing hardware support for dual-band communication; the dual-frequency dual-polarization lens antenna in this embodiment realizes dual-band communication through one device, which is beneficial to improving device integration, reducing equipment volume, reducing structural complexity and use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the overall structure of the dual-frequency dual-polarization lens antenna in the embodiment;

[0024] Figure 2 Schematic diagram of the structure of the dielectric plate and the air layer in the embodiment;

[0025] FIG3(a) and FIG3(b) are schematic structural diagrams of a lens unit in an embodiment;

[0026] Figure 4 Schematic diagram of compensation phase distribution at four optimized frequency points in the embodiment;

[0027] FIG5( a ) is a simulation result of antenna gain of the dual-frequency dual-polarization lens antenna in the embodiment at E-band frequency;

[0028] FIG5( b ) is a simulation result of antenna gain of the dual-frequency dual-polarization lens antenna in the embodiment at D-band frequency;

[0029] Figure 6 Schematic diagram of the axial ratio of the dual-frequency dual-polarization lens antenna in the E band in the embodiment. DETAILED DESCRIPTION

[0030] In this embodiment, the structure of the dual-frequency dual-polarization lens antenna is as follows: Figure 1 See Figure 1 , the dual-frequency dual-polarization lens antenna includes a polarizer and a lens module. In this embodiment, Figure 1 A spatial rectangular coordinate system is established as shown, wherein the direction of the X axis is the first direction, the direction of the Y axis is the second direction, and the direction of the Z axis is the third direction. Figure 1 The lens module is coupled to the polarizer in a third direction. For example, when the Z-axis, ie, the third direction, is an up-and-down direction, the lens module may be located below the polarizer.

[0031] In this embodiment, 3D printing technology can be used to make a lens module and a polarizer using polymer materials respectively, and then the lens module and the polarizer are bonded together. 3D printing technology can also be used to directly make a dual-frequency dual-polarization lens antenna with polymer materials, which can be divided into two parts: the lens module and the polarizer. Among them, the dielectric constant of the polymer material used to make the dual-frequency dual-polarization lens antenna is ε r =2.66, and the loss tangent is tanδ=0.03.

[0032] In this embodiment, the polarizer has the following characteristics: the polarizer has a certain relative dielectric constant along the X-axis, i.e., the first direction, and also has a certain relative dielectric constant along the Y-axis, i.e., the second direction, and the relative dielectric constant along the X-axis, i.e., the first direction is different from the relative dielectric constant along the Y-axis, i.e., the second direction.

[0033] In order to achieve that the relative dielectric constant along the X-axis, i.e., the first direction, is different from the relative dielectric constant along the Y-axis, i.e., the second direction, in this embodiment, the Figure 1 Polarizer shown. Figure 1 , the polarizer includes a plurality of dielectric plates. Taking any one of the dielectric plates as an example, the dielectric substrate is rectangular, the length direction of the dielectric plate extends along the X axis, i.e., the first direction, and the height direction of the dielectric plate extends along the Z axis, i.e., the third direction. Figure 1 The dielectric plates are arranged along the Y-axis, i.e., the second direction, and the dielectric plates are kept parallel to each other. There is an air layer between any two adjacent polarizers.

[0034] In this embodiment, taking one of the dielectric plates as an example, the size of the dielectric plate and the adjacent air layer is as follows: Figure 2 See Figure 2 , the width of the air layer is W1, the width of the dielectric plate is W2, and the height of the dielectric plate is H. Figure 2 In the figure, the air layer on both sides of the dielectric plate shows half the width, so Figure 2The width of the air layer is W1 / 2. Since the arrangement of the dielectric plates along the X-axis and the Y-axis is different (a single dielectric plate extends along the X-axis, and multiple dielectric plates are arranged along the Y-axis), the polarizer with this structure has different relative dielectric constants along the X-axis and the Y-axis.

[0035] Specifically, let the relative dielectric constant of the polarizer along the X-axis, i.e., the first direction, be ε x , the relative dielectric constant along the Y axis, i.e. the second direction, is ε y , then ε x and ε y As shown below:

[0036]

[0037] ε y =1+(ε r -1)r (2)

[0039] In formulas (1) and (2), r = W2 / (W1+W2), ε r is the dielectric constant of the polymer material used to make the polarizer. According to formulas (1) and (2), systematically adjusting the unit cell parameters such as W1 and W2) can effectively change the relative dielectric constant ε in the x direction. x and the relative dielectric constant ε in the y direction y .

[0040] It is worth noting that formulas (1) and (2) show that ε y Greater than ε x , resulting in the phase velocity of the wave polarized along the Y axis, i.e. the second direction, in the polarizer being slower than the wave polarized along the X axis, i.e. the first direction. The phase difference between the waves in these two directions can be calculated using the following formula.

[0041]

[0042]

[0043] Where H is the height of the dielectric plate in the polarizer and λ0 is the central operating wavelength.

[0044] According to formula (3), we can see Depends on ε x , ε y , H and λ0. For a given unit structure polarizer, ε x , ε y and H are fixed values, while It changes proportionally with the change of λ0. When the frequency doubles, The wavelength of the electromagnetic wave can be roughly doubled, which can be achieved by adjusting the electromagnetic wave between the E band and the D band. Therefore, once the unit structure is determined to achieve about 90° in the E band, The conversion from linear polarization wave (LP wave) to circular polarization wave (CP wave) can be realized in the E band. It can be inferred that for the same unit structure, In the D band, it is approximately 180°, which allows cross-polarization conversion of linearly polarized waves. After calculation and simulation, the unit parameters can be set to W2 = 0.348 mm, W1 = 0.752 mm, and H = 7 mm.

[0045] In this embodiment, the lens module can perform phase control on the signal. Since the polarizer can convert linearly polarized waves into circularly polarized waves in dual bands (such as E band and D band), the dual-frequency dual-polarization lens antenna including the polarizer and the lens module in this embodiment can achieve dual-frequency dual polarization, thereby providing hardware support for dual-band communications such as E band and D band; the dual-frequency dual-polarization lens antenna in this embodiment realizes dual-band communication through one device, which is beneficial to improving device integration, reducing equipment size, and reducing structural complexity and use cost.

[0046] In this embodiment, refer to Figure 1 , the lens module includes a plurality of lens units, that is, the lens module can be a super lens.

[0047] Reference Figure 1 The lens units are periodically arranged on a plane where the X-axis, i.e., the first direction, and the Y-axis, i.e., the second direction, are located, and the height direction of the lens units extends along the Z-axis, i.e., the third direction.

[0048] Specifically, taking any one of the lens units as an example, the lens unit may use the structure shown in FIG. 3( a ) or the structure shown in FIG. 3( b ).

[0049] In this embodiment, the lens unit having the structure shown in FIG. 3( a ) is referred to as a first type of lens unit, and the lens unit having the structure shown in FIG. 3( b ) is referred to as a second type of lens unit.

[0050] 3(a), the first type of lens unit includes a first solid square column, a first cavity and a second cavity are provided inside the first solid square column, and the first cavity is connected to the second cavity. The bottom surface area of ​​the first cavity is greater than the bottom surface area of ​​the second cavity. The first cavity is located on a side close to the polarizer, and the second cavity is located on a side away from the polarizer, that is, the first cavity is closer to the polarizer than the second cavity.

[0051] Referring to Figure 3(b), the second type of lens unit includes a second physical square column and a third physical square column, the top surface of the second physical square column is connected to the bottom surface of the third physical square column, the bottom surface area of ​​the second physical square column is larger than the bottom surface area of ​​the third physical square column, the second physical square column is located on the side close to the polarizer, and the third physical square column is located on the side away from the polarizer, that is, the second physical square column is closer to the polarizer than the third physical square column.

[0052] In this embodiment, referring to FIG. 3( a ) and FIG. 3( b ), regardless of whether it is the first type of lens unit or the second type of lens unit, the bottom of the lens unit (ie, the plane formed by the X-axis and the Y-axis) is the end connected to the polarizer.

[0053] In this embodiment, the period of the lens units is p=1 mm, that is, for any lens unit, an adjacent lens unit is found along the X-axis, ie, the first direction, or the Y-axis, ie, the second direction, and the distance between the two lens units is p=1 mm.

[0054] In this embodiment, all lens units in the lens module may be lens units of the first type, all lens units may be lens units of the second type, or some lens units may be lens units of the first type and the other lens units may be lens units of the second type.

[0055] In this embodiment, referring to Fig. 3(a) and Fig. 3(b), no matter it is the first type of lens unit or the second type of lens unit, the total height of the lens unit is h. Specifically, h is adjusted in the range of [3mm, 7mm] with a step length of 0.5mm, that is, the total height of the lens unit can be 3mm, 3.5mm, 4.0mm, etc., and the total heights of different lens units can be different.

[0056] In this embodiment, referring to FIG3(a), in the first type of lens unit, the side length of the top surface (bottom surface) of the first cavity in the first solid square column is b, and the height is h1, and the side length of the top surface (bottom surface) of the second cavity is a, and the height is h2. Referring to FIG3(b), in the second type of lens unit, the side length of the top surface (bottom surface) of the second solid square column is d, and the height is h3, and the side length of the top surface (bottom surface) of the fourth solid square column is c, and the height is h4.

[0057] In this embodiment, the values ​​of a and b are adjusted within the range of 0.6 mm to 0.9 mm, with a step length of 0.05 mm, and c and d are changed within the range of 0.25 mm to 0.6 mm, with a step length of 0.05 mm. That is, the values ​​of a and b can be 0.6 mm, 0.605 mm, 0.610 mm, etc., and the values ​​of c and d can be 0.25 mm, 0.255 mm, etc. The values ​​of a, b, c or d of different lens units can be different.

[0058] In this embodiment, for any lens unit, the corresponding coefficient k can be determined. After determining its total height h, the height h1 (or h3) is determined by calculating k*h, and the height h2 (or h4) is determined by calculating (1-k)*h. In this embodiment, the coefficient k varies in the range of 0.2 to 0.8, with a step size of 0.1, that is, the coefficient k can be 0.2, 0.3, etc., and the values ​​of the coefficient k of different lens units can be different.

[0059] In this embodiment, since a (or c), b (or d), h, k, etc. of different lens units can have different value combinations, under the above-mentioned step size, 1794 lens units with different geometric parameters can be generated, and their phase change range is 0° to 360°.

[0060] For a given unit structure library (i.e., a combination of multiple lens units with specific geometric parameters and position distribution), the phase delay that can be provided is certain, and the matching error can be reduced by optimizing the reference phase of multiple frequency points, thereby improving the gain and bandwidth of the antenna. Specifically, if the frequency point at which the dual-frequency dual-polarization lens antenna works is point, then for the lens module numbered ij and located at (x ij ,y ij )(that is, the coordinate on the X-axis is x ij , the coordinate on the Y axis is y ij ) lens unit, the phase compensation it produces can be set to in satisfy:

[0061]

[0062] where f point is the frequency size corresponding to the design frequency point, c is the speed of light, F is the design focal length of the lens module, and can be flexibly adjusted according to actual conditions. point is the reference phase corresponding to the design frequency point.

[0063] In this embodiment, the dual-frequency dual-polarization lens antenna can be used in dual-frequency communications in the E band and the D band. In order to make the dual-frequency dual-polarization lens antenna meet the dual-band broadband characteristics, the four frequency points of 75GHz and 85GHz in the E band and 135GHz and 145GHz in the D band can be determined as the design frequencies. That is, the points can be 75G, 85G, 135G, and 145G respectively. In this way, formula (4) can be specifically formulated as:

[0064]

[0065] In the above formula, and At the design frequency points of 75 GHz, 85 GHz, 135 GHz and 145 GHz respectively, the position is (x ij ,y ij ) lens unit needs to produce phase compensation, f 75G 、f 85G 、f 135G and f 145G The values ​​of DP are 75GHz, 85GHz, 135GHz and 145GHz respectively. 75G , DP 85G , DP 135G and DP 145G They are the reference phases at the design frequency points of 75 GHz, 85 GHz, 135 GHz and 145 GHz respectively.

[0066] In this embodiment, the phase compensation generated by the lens unit can be optimized according to the phase matching principle. Specifically, the phase delay provided by each lens unit can be designed to meet the phase compensation required for calculation. The difference between the phase delay provided by the unit structure and the required phase compensation is called the phase matching error. According to the phase matching requirements, the phase matching error of the lens unit at all frequency points is the smallest, that is:

[0067]

[0068] in is the phase delay provided by the lens unit. The meaning of formula (5) is: for the position (x ij ,y ij ) lens unit, which produces phase compensation Make Since the points in this embodiment are 75G, 85G, 135G, and 145G respectively, formula (5) can be specifically as follows:

[0069]

[0070] That is, for the position (x ij ,y ij ) lens unit, the optimization target is its generated and Equal phase compensation makes Specifically, the particle swarm algorithm can be used to find a reference phase with a smaller matching error at all four frequency points, such as determining the position coordinates (x ij ,y ij) is taken, so that the designed lens antenna meets the requirements of dual-band width in the E-band and the D-band, thereby optimizing the effect of further reducing the matching error.

[0071] In this embodiment, after the optimization, the compensation phase distribution of the four frequency points is as follows: Figure 4 As shown. Among them, Figure 4 Part (a) is the phase compensation distribution at the frequency point of 75 GHz after reference phase optimization. Figure 4 Part (b) shows the phase compensation distribution at the frequency point of 85 GHz after reference phase optimization. Figure 4 Part (c) is the phase compensation distribution at the frequency point of 135 GHz after reference phase optimization. Figure 4 Part (d) is the phase compensation distribution at the frequency point of 145 GHz after reference phase optimization.

[0072] In this embodiment, Figure 1 The dual-frequency dual-polarization lens antenna shown in FIG. 5 is simulated, where the size of the dual-frequency dual-polarization lens antenna (e.g., the side length on the plane formed by the X-axis and the Y-axis) is 46 mm × 46 mm, and the horn antennas of the WR-12 and WR-7 standard waveguides with working frequencies of the E-band and D-band are used for feeding. The simulation process is completed by HFSS software. The antenna gain simulation results of the D-band and E-band at different frequencies are shown in FIG. 5(a) and FIG. 5(b), respectively.

[0073] The red curve in Figure 5(a) represents the antenna gain simulation result of the metalens, i.e., the lens module, at the E-band frequency, and the blue curve in Figure 5(a) represents the antenna gain simulation result of the feed horn at the E-band frequency. The red curve in Figure 5(b) represents the antenna gain simulation result of the metalens, i.e., the lens module, at the D-band frequency, and the blue curve in Figure 5(b) represents the antenna gain simulation result of the feed horn at the D-band frequency.

[0074] Figure 6 for Figure 1 The diagram shows the axial ratio (AR) of the dual-frequency dual-polarization lens antenna in the E-band. Figure 6 show, Figure 1 The dual-band dual-polarization lens antenna shown achieves an axial ratio of less than 3 dB in the frequency range of 64 GHz to 88 GHz, with good performance.

[0075] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature, or it may be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, etc. used in the present disclosure are only relative to the relative positional relationship of the components of the present disclosure in the accompanying drawings. The singular forms of "a", "" and "the" used in the present disclosure are also intended to include the plural forms, unless the context clearly indicates other meanings. In addition, unless otherwise defined, all technical and scientific terms used in this embodiment have the same meaning as those generally understood by those skilled in the art. The terms used in the specification of this embodiment are only for describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this embodiment includes any combination of one or more related listed items.

[0076] It should be understood that, although the term first, second, third etc. may be adopted to describe various elements in the present disclosure, these elements should not be limited to these terms. These terms are only used to distinguish the same type of elements from each other. For example, without departing from the scope of the present disclosure, the first element may also be referred to as the second element, and similarly, the second element may also be referred to as the first element. The use of any and all examples or exemplary language ("for example", "such as" etc.) provided by the present embodiment is only intended to better illustrate embodiments of the present invention, and unless otherwise required, the scope of the present invention will not be limited.

[0077] It should be appreciated that embodiments of the present invention may be implemented or enforced by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable memory. The method may be implemented in a computer program using standard programming techniques - including a non-transitory computer-readable storage medium configured with a computer program, wherein the storage medium so configured causes the computer to operate in a specific and predefined manner - according to the methods and drawings described in the specific embodiments. Each program may be implemented in a high-level procedural or object-oriented programming language to communicate with a computer system. However, if desired, the program may be implemented in assembly or machine language. In any case, the language may be a compiled or interpreted language. In addition, the program may be run on a programmed dedicated integrated circuit for this purpose.

[0078] In addition, the operations of the process described in this embodiment may be performed in any suitable order, unless otherwise indicated in this embodiment or otherwise clearly contradicted by the context. The process described in this embodiment (or variations and / or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as a code (e.g., executable instructions, one or more computer programs, or one or more applications) executed on one or more processors in common, by hardware or a combination thereof. A computer program includes a plurality of instructions that may be executed by one or more processors.

[0079] Further, the method can be implemented in any type of computing platform that is operably connected to a suitable computer, including but not limited to a personal computer, a minicomputer, a mainframe, a workstation, a network or distributed computing environment, a separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, etc. Various aspects of the present invention can be implemented in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, an optical read and / or write storage medium, a RAM, a ROM, etc., so that it can be read by a programmable computer, and when the storage medium or device is read by the computer, it can be used to configure and operate the computer to perform the process described herein. In addition, the machine-readable code, or part thereof, can be transmitted via a wired or wireless network. When such media includes instructions or programs that implement the above steps in conjunction with a microprocessor or other data processor, the invention of this embodiment includes these and other different types of non-transitory computer-readable storage media. When programmed according to the methods and techniques of the present invention, the present invention also includes the computer itself.

[0080] The computer program can be applied to input data to perform the functions of the present embodiment, thereby converting the input data to generate output data stored in a non-volatile memory. The output information can also be applied to one or more output devices such as a display. In a preferred embodiment of the present invention, the converted data represents a physical and tangible object, including a specific visual depiction of the physical and tangible object produced on the display.

[0081] The above are only preferred embodiments of the present invention. The present invention is not limited to the above embodiments. As long as the technical effects of the present invention are achieved by the same means, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention. Within the scope of protection of the present invention, its technical solutions and / or implementation methods may have various modifications and changes.

Claims

1. A dual-frequency dual-polarization lens antenna, characterized in that: The dual-frequency dual-polarization lens antenna comprises: A polarizer; wherein the relative dielectric constant of the polarizer along the first direction is different from the relative dielectric constant along the second direction; A lens module; the lens module is joined to the polarizer in a third direction; the first direction, the second direction and the third direction are perpendicular to each other.

2. The dual-frequency dual-polarization lens antenna according to claim 1, characterized in that: The polarizer includes a plurality of dielectric plates, wherein the length direction of the dielectric plates extends along the first direction, the height direction of the dielectric plates extends along the third direction, and the dielectric plates are arranged along the second direction.

3. The dual-frequency dual-polarization lens antenna according to claim 2, characterized in that: There is an air layer between any two adjacent polarizers.

4. The dual-frequency dual-polarization lens antenna according to claim 1, characterized in that: The lens module includes a plurality of lens units, the lens units are periodically arranged on a plane where the first direction and the second direction are located, and a height direction of the lens units extends along the third direction.

5. The dual-frequency dual-polarization lens antenna according to claim 4, characterized in that: Any of the lens units belongs to the first type of lens unit or the second type of lens unit; The first type of lens unit includes a first solid square column, a first cavity and a second cavity are provided inside the first solid square column, the first cavity is connected to the second cavity, the bottom area of ​​the first cavity is larger than the bottom area of ​​the second cavity, the first cavity is located on a side close to the polarizer, and the second cavity is located on a side away from the polarizer.

6. The dual-frequency dual-polarization lens antenna according to claim 5, characterized in that: The first type of lens unit includes a second solid square column and a third solid square column, the top surface of the second solid square column is connected to the bottom surface of the third solid square column, the bottom surface area of ​​the second solid square column is larger than the bottom surface area of ​​the third solid square column, the second solid square column is located on a side close to the polarizer, and the third solid square column is located on a side away from the polarizer.

7. The dual-frequency dual-polarization lens antenna according to claim 6, characterized in that: In the lens module, all of the lens units are lens units of the first type, or all of the lens units are lens units of the second type, or some of the lens units are lens units of the first type and some of the lens units are lens units of the second type.

8. The dual-frequency dual-polarization lens antenna according to any one of claims 4 to 7, characterized in that: The phase compensation generated by the lens unit satisfies: in, is numbered ij and located at (x ij ,y ij ) of the lens unit, x ij is the coordinate of the lens unit in the first direction, y ij is the coordinate of the lens unit in the second direction, point is the design frequency point of the dual-frequency dual-polarization lens antenna, and f point is the frequency corresponding to the design frequency point, c is the speed of light, F is the design focal length of the lens module, DP point is the reference phase corresponding to the design frequency point.

9. The dual-frequency dual-polarization lens antenna according to claim 8, characterized in that: The phase compensation generated by the lens unit satisfies: in A phase delay is provided to the lens unit.

10. The dual-frequency dual-polarization lens antenna according to claim 8, characterized in that: The design frequency point is 75 GHz, 85 GHz, 135 GHz or 145 GHz.

Images