Reconfigurable polarized decoupled dual circularly polarized reflectarray, control method and application

Abstract

The application belongs to the technical field of reflective array, and discloses a reconfigurable polarization decoupling dual-circularly polarized reflective array, a control method and application, which comprises a Ku-band dual-circularly polarized feed source and a full-metal reflective array; the Ku-band dual-circularly polarized feed source is located near the focal plane of the full-metal reflective array, and the full-metal reflective array comprises a plurality of periodically arranged metal reflective array units. The structure of the metal reflective array unit is designed by simultaneously combining a dynamic phase compensation technology and a geometric phase compensation technology, and simple mechanical control is combined to realize 1-bit*1-bit adjustable dual-circularly polarized phase compensation, and then the dual-circularly polarized beam scanning characteristics of the reflective array in a certain spatial range are realized. The design method is simple, the design period is short, the structure is stable, the processing is convenient, the assembly is convenient, and the application has important application value in the fields of vehicle-mounted / airborne radar and satellite communication.

Description

Technical Field

[0001] This invention belongs to the field of reflection array technology, and particularly relates to a reconfigurable dual-circular polarization reflection array with beam polarization decoupling characteristics, its control method, and its application. Background Technology

[0002] Reflector arrays combine the advantages of reflectors, phased arrays, and printed antennas, offering benefits such as low cost, low profile, high gain, and simple deployment. They are widely used in various scenarios including airborne / shipborne radar, satellite / space communication, and low-cost beamforming. In long-distance communication applications, multipath effects and electromagnetic interference in complex environments can easily cause polarization misalignment and transmission loss between the system's transmitter and receiver. Circularly polarized antennas, which are robust to environmental interference, can effectively address this issue. Furthermore, antennas with both broadband and dual-polarization characteristics are favored in communication systems requiring high-speed transmission and polarization multiplexing. Therefore, reflector arrays with broadband characteristics and the ability to operate with dual circular polarization within the same frequency band are of significant value for achieving high-speed, stable transmission, polarization multiplexing, low cost, and lightweight design in communication systems.

[0003] Most existing dual-circularly polarized reflector arrays operating at the same frequency exhibit coupling coherence in their left-hand and right-hand circular polarization states. This is because the array elements employ only one phase compensation technique (dynamic phase compensation or geometric phase compensation), limiting the phase modulation freedom of the elements. The left-hand and right-hand circular polarization phase compensations exhibit a certain degree of coherence, making independent polarization control of the reflected beam impossible. This coupling coherence between orthogonal polarizations significantly restricts the antenna's application breadth and potential. Therefore, dual-circularly polarized reflector arrays capable of polarization decoupling within the same frequency band have emerged. Most existing dual-circularly polarized reflector arrays with polarization decoupling within the same frequency band simultaneously utilize both of the aforementioned phase compensation techniques. By increasing the design freedom of the reflector array element structure, decoupling of the dual-circularly polarized phase compensation is achieved, thereby enabling independent polarization control of the reflected beam. However, the increased design freedom of the element structure also significantly increases the difficulty of array reconfigurable design, making it challenging to achieve beam scanning and beamforming functions. This is why existing polarization-decoupled dual-circular polarization reflector arrays have fixed beam pointing and lack beam scanning capabilities. However, in many practical applications such as satellite communications, reflector arrays with scanning and beamforming capabilities can more flexibly and efficiently cope with complex and ever-changing communication environments and system requirements compared to reflector arrays with relatively fixed beam pointing. Therefore, designing reconfigurable polarization-decoupled dual-circular polarization reflector arrays is a worthwhile area of ​​research and development.

[0004] Based on the above analysis, the problems and shortcomings of existing technologies are as follows: most existing dual-circular polarization reflector arrays cannot achieve polarization decoupling within the same frequency band, and the coherence of their left-hand and right-hand circular polarization beams limits the wide applicability and adaptability of the reflector arrays. Furthermore, the few existing dual-circular polarization reflector arrays that can achieve polarization decoupling within the same frequency band are difficult to reconfigurable due to the increased freedom in element design, thus lacking beam scanning and other functions, and unable to flexibly meet the complex and ever-changing communication needs in practical application scenarios. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a reconfigurable polarization-decoupled dual circular polarization reflection array, a control method, and its application.

[0006] This invention is implemented as follows: a reconfigurable polarization-decoupled dual-circular polarization reflector array includes a Ku-band dual-circular polarization feed and an all-metal reflector array. The all-metal reflector array comprises multiple periodically arranged metal reflector array elements. The Ku-band dual-circular polarization feed is placed directly opposite the all-metal reflector array, located at the focal plane of the all-metal reflector array, at a vertical distance F from the array. Both sides of the all-metal reflector array have a length D, where 0.7... <F / D<1.2。

[0007] Furthermore, the metal reflective array elements are arranged in a two-dimensional periodic pattern at the center point of a square grid with a side length equal to the period length of the metal reflective array elements; the period length a of the metal reflective array elements is 0.4 to 0.6 operating wavelengths.

[0008] Furthermore, the metal reflective array unit includes a fixed part and a reconfigurable part, which are independent of each other and nested; wherein, the fixed part cannot be moved or rotated, and the reconfigurable part has two displacement states in the vertical direction and four rotation states in the horizontal plane.

[0009] Furthermore, the fixed part of the metal reflective array unit is a regular octagonal hole structure, and the reconfigurable part is a regular octagonal columnar structure with a rectangular groove at the top. The side length a1 of the regular octagon, the depth h and the width w of the rectangular groove are all fixed values. The reconfigurable part of the metal reflective array unit has two values ​​for the vertical displacement d (d1 mm and d2 mm) to achieve two types of dynamic phase compensation. At the same time, the reconfigurable part has four values ​​for the rotation angle in the horizontal plane (0°, 45°, 90°, 135°) to achieve four types of geometric phase compensation.

[0010] Furthermore, the two displacement states and four rotation states of the reconfigurable portion of the metal reflector array unit constitute all four position states (non-permutation and combination) of the reconfigurable portion: [d1 mm, 0°], [d2 mm, 45°], [d1 mm, 90°], [d2 mm, 135°]; these four position states of the metal reflector array unit are named states 1 to 4, and states 1 to 4 correspond to 1 bit of left-hand circular polarization phase compensation (φ) respectively. 左旋 =0 / π) and 1-bit right-hand circular polarization phase compensation (φ 右旋 There are all combinations of =0 / π, resulting in 4 phase compensation states: [φ 左旋 ,φ 右旋 ]=[0,0], [0,π], [π,π], [π,0].

[0011] Furthermore, the rectangular slot structure of the metal reflective array unit enables the reflection phases of the unit in the two orthogonal directions to always differ by 180°, so as to ensure that the electromagnetic waves before and after reflection will not undergo chiral reversal due to half-wave loss.

[0012] Furthermore, the entire all-metal reflective array is made of aluminum alloy.

[0013] Furthermore, the reconfigurable polarization-decoupled dual circular polarization reflector array can achieve arbitrary beam pointing within the range of azimuth angle -45° to 45° and elevation angle -45° to 45° under both left-hand and right-hand circular polarization excitation, with cross-polarization below -15dB and sidelobe electrical average below -10dB.

[0014] Specifically, when the left-hand circularly polarized beam pointing under left-hand circularly polarized excitation is fixed at (φ = 135°, θ = -30°), the reconfigurable polarization-decoupled dual circularly polarized reflector array can achieve a right-hand circularly polarized beam scanning range (φ = 45°, θ = 0° to -45°) under right-hand circularly polarized excitation, and the scanning gain decreases by no more than 1.2 dB; at the same time, the beam pointing under left-hand circularly polarized excitation remains stable, and the gain fluctuation is less than 1 dB;

[0015] Specifically, when the right-hand circularly polarized beam pointing under right-hand circularly polarized excitation is fixed at (φ = 45°, θ = -30°), the reconfigurable polarization-decoupled dual circularly polarized reflector array can achieve a left-hand circularly polarized beam scanning range (φ = 135°, θ = 0° to -45°) under left-hand circularly polarized excitation, and the scanning gain decreases by no more than 1.2dB; at the same time, the beam pointing under right-hand circularly polarized excitation remains stable, and the gain fluctuation is less than 0.7dB.

[0016] Another object of the present invention is to provide a control method for a reconfigurable polarization-decoupled dual-circular polarization reflection array, comprising the following steps:

[0017] Step 1: Set the size D of the all-metal reflector array, and determine the appropriate focal length F based on the radiation characteristics of the Ku-band dual circularly polarized feed and the size of the all-metal reflector array.

[0018] Step 2: Based on the positional relationship between the Ku-band dual-circularly polarized feed and the all-metal reflector obtained in Step 1, determine the illumination phase distribution of the Ku-band dual-circularly polarized feed on the surface of the all-metal reflector.

[0019] Step 3: Based on the illumination phase distribution obtained in Step 2 and the required dual circular polarization beam direction, calculate the required dual circular polarization phase compensation amount for each unit of the all-metal reflective array, and convert it into a 1-bit × 1-bit dual circular polarization phase compensation form.

[0020] Step 4: Based on the 1-bit × 1-bit dual circular polarization phase compensation distribution required for each unit obtained in Step 3, obtain the position state (state 1 to state 4) corresponding to each unit.

[0021] Step 5: Based on the positional state of each unit obtained in Step 4, perform mechanical displacement and rotation operations on each unit to obtain the reflection array structure corresponding to the desired dual circularly polarized beam pointing.

[0022] Step six, combine the Ku-band dual circularly polarized feed and the all-metal reflector array obtained in step five according to... Figure 1 Place them according to the indicated positional relationship;

[0023] Step 7: By switching the left-hand and right-hand circular polarization working states of the Ku-band dual circular polarization feed, the left-hand and right-hand circular polarization reflected beams are made to point in their respective directions.

[0024] Step 8: By changing the position and state of each unit in the all-metal reflective array, the left-hand and right-hand circularly polarized reflective beams can perform beam scanning without interfering with each other within a certain spatial range.

[0025] The present invention also provides a satellite communication antenna, wherein the satellite communication antenna employs the aforementioned reconfigurable polarization-decoupled dual circular polarization reflector array.

[0026] The present invention also provides a vehicle-mounted / airborne radar antenna, wherein the vehicle-mounted / airborne radar antenna employs the aforementioned reconfigurable polarization-decoupled dual circular polarization reflector array.

[0027] Based on the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solution to be protected by this invention are as follows:

[0028] (1) The present invention applies both dynamic phase compensation method and geometric phase compensation method to enable the designed metal reflective array unit to achieve decoupling control of left-hand and right-hand circular polarization phases, thereby realizing independent control of left-hand and right-hand circular polarization beams by the reflective array.

[0029] (2) This invention achieves 1-bit × 1-bit adjustable dual circular polarization phase compensation by performing simple mechanical operations on the reflector array unit, thereby realizing the reconfigurable design of the reflector array, enabling the left-hand and right-hand circular polarization beams of the reflector array to achieve beam scanning function with no interference and good performance within a certain spatial range.

[0030] (3) The metal reflective array unit of the present invention adopts a structure with a rectangular slot at the top of a regular octagonal prism. This structure enables the metal reflective array unit to always have a phase difference of π in the two orthogonal directions, so as to ensure that the chirality of the electromagnetic wave before and after reflection will not be reversed due to the half-wave loss effect.

[0031] (4) The metal reflective array unit of the present invention adopts a structure of regular octagonal holes nested with regular octagonal prisms. Adjustable dynamic phase compensation is achieved by mechanically moving the regular octagonal prisms in the vertical direction, and adjustable geometric phase compensation is achieved by mechanically rotating the regular octagonal prisms in the horizontal plane. That is, the present invention achieves adjustable dual circular polarization phase compensation of 1 bit × 1 bit of reflective array unit with only simple mechanical operation. At the same time, the profile height of the all-metal reflective array is only 0.7 to 0.9 working wavelengths. The whole body is made of aluminum alloy, with simple structure and easy processing and assembly.

[0032] (5) The reconfigurable polarization decoupled dual circular polarization reflector array design method of the present invention is simple, has a short design cycle, stable structure, convenient processing and assembly, and can meet the requirements of dual circular polarization, high gain, low axial ratio and lightweight. Its polarization decoupling and beam scanning characteristics have extremely high application potential and application value in satellite communication, vehicle / airborne radar and other fields. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the reconfigurable polarization-decoupled dual-circular polarization reflection array provided in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of the metal reflective array unit provided in an embodiment of the present invention;

[0035] Figure 3 This is a three-view diagram of the metal reflective array unit in states 1 to 4 provided in the embodiments of the present invention, and the corresponding 1-bit × 1-bit dual circular polarization phase compensation;

[0036] Figure 4These are the circular polarization responses of the metal reflective array elements in states 1 to 4 provided in this embodiment of the invention. Figure 4 (a) The double circular polarization reflection coefficients of states 1–4 in the data. Figure 4 (b) The left-handed circularly polarized reflection phase of states 1-4 in the middle Figure 4 The right-hand circularly polarized reflection phases of states 1 to 4 in (c).

[0037] Figure 5 This is a state distribution diagram of the array elements when the reconfigurable polarization-decoupled dual circularly polarized reflector array provided in this embodiment of the invention has its left-hand circularly polarized beam pointing fixed at (φ=135°, θ=-30°) under left-hand circularly polarized excitation, and simultaneously achieves right-hand circularly polarized beam scanning (φ=45°, θ=0°~-45°) under right-hand circularly polarized excitation. Figure 5 (a) Right-hand circularly polarized beam pointing (φ=45°, θ=0°), Figure 5 (b) Right-hand circularly polarized beam pointing (φ=45°, θ=-10°), Figure 5 (c) Right-hand circularly polarized beam pointing (φ=45°, θ=-20°), Figure 5 (d) Right-hand circularly polarized beam pointing (φ=45°, θ=-30°), Figure 5 (e) Right-hand circularly polarized beam pointing (φ=45°, θ=-40°), Figure 5 (f) Right-hand circularly polarized beam pointing (φ=45°, θ=-45°).

[0038] Figure 6 This is a state distribution diagram of the array elements when the reconfigurable polarization-decoupled dual circularly polarized reflector array provided in this embodiment of the invention has its right-hand circularly polarized beam pointing fixed at (φ=45°, θ=-30°) under right-hand circularly polarized excitation, and simultaneously achieves left-hand circularly polarized beam scanning (φ=135°, θ=0°~-45°) under left-hand circularly polarized excitation. Figure 6 (a) Left-hand circularly polarized beam pointing (φ=135°, θ=0°), Figure 6 (b) Left-hand circularly polarized beam pointing (φ=135°, θ=-10°), Figure 6 (c) Left-hand circularly polarized beam pointing (φ=135°, θ=-20°), Figure 6 (d) Left-hand circularly polarized beam pointing (φ=135°, θ=-30°), Figure 6 (e) Left-hand circularly polarized beam pointing (φ=135°, θ=-40°), Figure 6 (f) The left-hand circularly polarized beam direction (φ = 135°, θ = -45°).

[0039] Figure 7The reconfigurable polarization-decoupled dual circularly polarized reflector array provided in this embodiment of the invention has a fixed left-hand circularly polarized beam pointing (φ = 135°, θ = -30°) under left-hand circularly polarized excitation, and simultaneously achieves a right-hand circularly polarized beam scanning (φ = 45°, θ = 0° to -45°) under right-hand circularly polarized excitation. Figure 7 (a) Left-handed circularly polarized excitation in a plane with φ = 135° Figure 7 (b) Right-hand circular polarization excitation in the φ = 45° plane.

[0040] Figure 8 The reconfigurable polarization-decoupled dual circularly polarized reflector array provided in this embodiment of the invention has a fixed right-hand circularly polarized beam pointing (φ = 45°, θ = -30°) under right-hand circularly polarized excitation, and simultaneously achieves a left-hand circularly polarized beam scanning (φ = 135°, θ = 0° to -45°) under left-hand circularly polarized excitation. Figure 8 (a) Left-handed circularly polarized excitation in a plane with φ = 135° Figure 8 (b) Right-hand circular polarization excitation in the φ = 45° plane.

[0041] In the figure: 1. Ku-band dual circular polarization feed; 2. All-metal reflector array; 3. Metal reflector array element; 3a. Reconfigurable part of the metal reflector array element; 3b. Fixed part of the metal reflector array element. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0043] To enable those skilled in the art to fully understand how the present invention is specifically implemented, this section provides an explanatory description of the embodiments that expand upon the technical solutions of the claims.

[0044] like Figure 1 As shown, the reconfigurable polarization-decoupled dual-circular polarization reflector array provided in this embodiment of the invention includes an all-metal reflector array 2 and a Ku-band dual-circular polarization feed 1 placed opposite the all-metal reflector array 2.

[0045] The Ku-band dual-circular polarized feed 1 is placed near the focal plane of the all-metal reflector array 2, at a vertical distance of F from the array. The side length of the all-metal reflector array 2 is D, where 0.7 <F / D<1.2。

[0046] The all-metal reflective array 2 includes multiple periodically arranged metal reflective array elements 3.

[0047] The metal reflective array elements 3 are arranged in a two-dimensional periodic pattern at the center point of a square grid with a side length equal to the period length of the element.

[0048] Figure 2 Given Figure 1 The schematic diagram of the structure of the metal reflective array unit 3 is shown. The metal reflective array unit 3 includes a reconfigurable part 3a and a fixed part 3b, which are independent of each other and nested. The fixed part 3b cannot be moved or rotated, and the reconfigurable part 3a has two displacement states in the vertical direction and four rotation states in the horizontal plane, which are used to realize two kinds of dynamic phase compensation and four kinds of geometric phase compensation, respectively.

[0049] The metal reflective array unit 3 is made entirely of aluminum alloy.

[0050] The period length a of the metal reflective array unit 3 is 0.4 to 0.6 operating wavelengths.

[0051] The fixed part 3b of the metal reflective array unit 3 is a regular octagonal hole structure, and the reconfigurable part 3a is a regular octagonal column structure with a rectangular groove at the top; wherein, the side length a1 of the regular octagon, the depth h and the width w of the rectangular groove are all fixed values.

[0052] Figure 3 Given Figure 1 Three-view diagrams of the four position states (state 1 to state 4) of the metal reflective array element 3 and their corresponding 1-bit × 1-bit dual circular polarization phase compensation.

[0053] The reconfigurable portion 3a of the metal reflector array unit 3 has two vertical displacement values ​​d (d1 mm and d2 mm) and four horizontal rotation angle values ​​(0°, 45°, 90°, 135°). These two displacement states and four rotation states of the reconfigurable portion 3a of the metal reflector array unit 3 constitute four position states (non-permutation / combination): State 1 - [d1 mm, 0°], State 2 - [d2 mm, 45°], State 3 - [d1 mm, 90°], and State 4 - [d2 mm, 135°], each corresponding to 1 bit of left-hand circular polarization phase compensation (φ). 左旋 =0 / π) and 1-bit right-hand circular polarization phase compensation (φ 右旋 All combinations of φ = 0 / π: [φ 左旋 ,φ 右旋 ]=[0,0], [0,π], [π,π], [π,0].

[0054] Figure 4 Given Figure 1 The circular polarization response of the metal reflector array element 3 in its four position states.

[0055] Figure 4 (a) in the figure gives the dual circular polarization reflection coefficients of the metal reflective array element 3 in states 1 to 4. Figure 4 (b) in the figure gives the left-hand circularly polarized reflection phase of the metal reflective array element 3 in states 1 to 4. Figure 4 (c) in the figure gives the right-hand circularly polarized reflection phase of the metal reflective array element 3 in states 1 to 4.

[0056] The metal reflective array element 3 can guarantee good circular polarization reflection characteristics in states 1 to 4, and can meet the requirements of circular polarization reflection loss not exceeding 0.5dB and cross-polarization reflection coefficient not exceeding -10dB in the range of 11.5 to 12.5 GHz; at the same time, the dual circular polarization reflection phases corresponding to states 1 to 4 are also consistent with... Figure 3 The correspondences in the data are consistent: State 1 - [0,0], State 2 - [0,π], State 3 - [π,π], State 4 - [π,0].

[0057] Figure 5 The diagram shows the positional distribution of the array elements when the reconfigurable polarization-decoupled dual circularly polarized reflector array is used, with the left-hand circularly polarized beam pointing fixed at (φ = 135°, θ = -30°) under left-hand circularly polarized excitation, and simultaneously achieving right-hand circularly polarized beam scanning (φ = 45°, θ = 0° to -45°) under right-hand circularly polarized excitation.

[0058] Figure 5 Figure (a) shows the position distribution of array elements when the left-hand circularly polarized beam pointing (φ = 135°, θ = -30°) and the right-hand circularly polarized beam pointing (φ = 45°, θ = 0°). Figure 5 Figure (b) shows the position distribution of array elements when the left-hand circularly polarized beam pointing (φ = 135°, θ = -30°) and the right-hand circularly polarized beam pointing (φ = 45°, θ = -10°). Figure 5 Figure (c) shows the position distribution of the array elements when the left-hand circularly polarized beam pointing (φ = 135°, θ = -30°) and the right-hand circularly polarized beam pointing (φ = 45°, θ = -20°). Figure 5 Figure (d) shows the position distribution of array elements when the left-hand circularly polarized beam pointing (φ = 135°, θ = -30°) and the right-hand circularly polarized beam pointing (φ = 45°, θ = -30°). Figure 5 Figure (e) shows the position distribution of array elements when the left-hand circularly polarized beam pointing (φ = 135°, θ = -30°) and the right-hand circularly polarized beam pointing (φ = 45°, θ = -40°). Figure 5Figure (f) in the figure shows the position distribution of the array elements when the left-hand circularly polarized beam pointing (φ = 135°, θ = -30°) and the right-hand circularly polarized beam pointing (φ = 45°, θ = -45°).

[0059] Figure 6 The diagram shows the positional distribution of the array elements when the right-hand circularly polarized beam pointing is fixed at (φ = 45°, θ = -30°) under right-hand circularly polarized excitation, and when the left-hand circularly polarized beam scanning is achieved at (φ = 135°, θ = 0° to -45°) under left-hand circularly polarized excitation.

[0060] Figure 6 Figure (a) shows the position distribution of array elements when the right-hand circularly polarized beam pointing (φ = 45°, θ = -30°) and the left-hand circularly polarized beam pointing (φ = 135°, θ = 0°). Figure 6 Figure (b) shows the position distribution of array elements when the right-hand circularly polarized beam pointing (φ = 45°, θ = -30°) and the left-hand circularly polarized beam pointing (φ = 135°, θ = -10°). Figure 6 Figure (c) shows the position distribution of the array elements when the right-hand circularly polarized beam pointing (φ = 45°, θ = -30°) and the left-hand circularly polarized beam pointing (φ = 135°, θ = -20°). Figure 6 Figure (d) shows the position distribution of array elements when the right-hand circularly polarized beam pointing (φ = 45°, θ = -30°) and the left-hand circularly polarized beam pointing (φ = 135°, θ = -30°). Figure 6 Figure (e) shows the position distribution of array elements when the right-hand circularly polarized beam pointing (φ = 45°, θ = -30°) and the left-hand circularly polarized beam pointing (φ = 135°, θ = -40°). Figure 6 Figure (f) in the figure shows the position distribution of the array elements when the right-hand circularly polarized beam is pointed to (φ = 45°, θ = -30°) and the left-hand circularly polarized beam is pointed to (φ = 135°, θ = -45°).

[0061] Figure 7 The radiation pattern of the reconfigurable polarization-decoupled dual circularly polarized reflector array is given when the left-hand circularly polarized beam pointing is fixed at (φ=135°, θ=-30°) under left-hand circularly polarized excitation, and when the right-hand circularly polarized beam scanning is achieved at (φ=45°, θ=0°~-45°) under right-hand circularly polarized excitation.

[0062] Figure 7 Figure (a) shows the radiation pattern of the reconfigurable polarization-decoupled dual-circular polarization reflector array in the φ = 135° plane under left-hand circular polarization excitation. Figure 7 (b) in the figure gives the radiation pattern of the reconfigurable polarization-decoupled dual circularly polarized reflector array in the plane of φ = 45° under right-hand circularly polarized excitation.

[0063] When the left-hand circularly polarized beam pointing under left-hand circularly polarized excitation is fixed at (φ = 135°, θ = -30°), the reconfigurable polarization-decoupled dual circularly polarized reflector array can achieve a right-hand circularly polarized beam scanning range (φ = 45°, θ = 0° to -45°) under right-hand circularly polarized excitation, and the scanning gain decreases by no more than 1.2dB; at the same time, the beam pointing under left-hand circularly polarized excitation remains stable, and the gain fluctuation is less than 1dB; the cross-polarization is all below -15dB, and the sidelobe electrical average is below -10dB.

[0064] Figure 8 The radiation pattern of the reconfigurable polarization-decoupled dual circularly polarized reflector array is given when the right-hand circularly polarized beam pointing is fixed at (φ=45°, θ=-30°) under right-hand circularly polarized excitation, and when the left-hand circularly polarized beam scanning is achieved at (φ=135°, θ=0°~-45°) under left-hand circularly polarized excitation.

[0065] Figure 8 Figure (a) shows the radiation pattern of the reconfigurable polarization-decoupled dual-circular polarization reflector array in the φ = 135° plane under left-hand circular polarization excitation. Figure 8 (b) in the figure gives the radiation pattern of the reconfigurable polarization-decoupled dual circularly polarized reflector array in the plane of φ = 45° under right-hand circularly polarized excitation.

[0066] When the right-hand circularly polarized beam pointing under right-hand circularly polarized excitation is fixed at (φ = 45°, θ = -30°), the reconfigurable polarization-decoupled dual circularly polarized reflector array can achieve a left-hand circularly polarized beam scanning range (φ = 135°, θ = 0° to -45°) under left-hand circularly polarized excitation, and the scanning gain decreases by no more than 1.2dB; at the same time, the beam pointing under right-hand circularly polarized excitation remains stable, and the gain fluctuation is less than 0.7dB; the cross-polarization is all below -15dB, and the sidelobe electrical average is below -10dB.

[0067] To demonstrate the inventiveness and technical value of the technical solution of this invention, this section provides specific product or related technology application examples of the technical solution claimed.

[0068] This invention provides a satellite communication antenna, which employs the reconfigurable polarization-decoupled dual-circular polarization reflector array.

[0069] This invention provides a vehicle-mounted / airborne radar antenna, which employs a reconfigurable polarization-decoupled dual-circular polarization reflector array.

[0070] It should be noted that embodiments of the present invention can be implemented using hardware, software, or a combination of both. The hardware portion can be implemented using machining techniques, 3D printing techniques, or mechanical operations; the software portion can be stored in memory and executed by an appropriate instruction execution system, such as a pulse signal generator or dedicated hardware.

[0071] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A reconfigurable polarization-decoupled dual-circular polarization reflection array, characterized in that, The reconfigurable polarization-decoupled dual-circular polarization reflector array includes a Ku-band dual-circular polarization feed and an all-metal reflector array. The all-metal reflector array comprises multiple periodically arranged metal reflector array elements. The Ku-band dual-circular polarization feed is placed directly opposite the all-metal reflector array, located at the focal plane of the all-metal reflector array, with a vertical distance of [missing information]. F The length of each side of the all-metal reflective array is 100 mm. D , of which 0.7 < F / D <1.2; The metal reflective array unit includes a fixed part and a reconfigurable part, which are independent of each other and nested. The fixed part cannot be moved or rotated, while the reconfigurable part has two displacement states in the vertical direction and four rotation states in the horizontal plane. The fixed part of the metal reflective array unit is a regular octagonal hole structure, and the reconfigurable part is a regular octagonal column structure with a rectangular groove at the top.

2. The reconfigurable polarization-decoupled dual-circular polarization reflection array as described in claim 1, characterized in that, The metal reflective array elements are arranged in a two-dimensional periodic pattern, with each element positioned at the center point of a square grid. The side length of the square grid is the period length of the metal reflective array element. a The operating wavelength is 0.4 to 0.

6.

3. The reconfigurable polarization-decoupled dual-circular polarization reflection array as described in claim 1, characterized in that, The side length of the regular octagon a 1. Depth of the rectangular groove h and width w All are fixed values; the displacement of the reconfigurable portion of the metal reflective array element in the vertical direction d There are 2 possible values, which are d 1mm and d The 2mm diameter is used to achieve two types of dynamic phase compensation; at the same time, the reconfigurable part has four rotation angles in the horizontal plane: 0°, 45°, 90°, and 135°, which are used to achieve four types of geometric phase compensation.

4. The reconfigurable polarization-decoupled dual-circular polarization reflector array as described in claim 1, characterized in that, The two displacement states and four rotation states of the reconfigurable portion of the metal reflector array unit constitute all four position states of the reconfigurable portion: [ d 1mm, 0°]、[ d 2mm, 45°]、[ d 1mm, 90°]、[ d [2mm, 135°]; These four position states of the metal reflective array element are named states 1 to 4. States 1 to 4 correspond to all combinations of 1-bit left-hand circular polarization phase compensation and 1-bit right-hand circular polarization phase compensation, for a total of four phase compensation states: [ φ 左旋 , φ 右旋 ] = [0, 0]、[0, π ]、[ π , π ]、[ π , 0].

5. The reconfigurable polarization-decoupled dual-circular polarization reflection array as described in claim 1, characterized in that, The rectangular slot structure of the metal reflective array unit ensures that the reflection phases of the unit in the two orthogonal directions are always 180° apart, so as to ensure that the electromagnetic waves before and after reflection will not undergo chiral reversal due to half-wave loss.

6. The reconfigurable polarization-decoupled dual-circular polarization reflector array as described in claim 1, characterized in that, The reconfigurable polarization-decoupled dual circular polarization reflector array can achieve arbitrary beam pointing within the range of azimuth angle -45°~45° and elevation angle -45°~45° under both left-hand and right-hand circular polarization excitation, with cross-polarization below -15dB and sidelobe electrical average below -10dB. When the direction of the left-hand circularly polarized beam under left-hand circularly polarized excitation is fixed as φ =135°, θ At -30°, the reconfigurable polarization-decoupled dual-circularly polarized reflection array can achieve right-handed circular polarization excitation. φ =45°, θ The scanning range is 0° to -45° with right-hand circular polarization, and the scanning gain decreases by no more than 1.2 dB; at the same time, the beam pointing remains stable under left-hand circular polarization excitation, and the gain fluctuation is less than 1 dB. When the direction of the right-hand circularly polarized beam under right-hand circularly polarized excitation is fixed as φ =45°, θ At -30°, the reconfigurable polarization-decoupled dual-circular polarization reflection array can achieve [the desired effect] under left-handed circular polarization excitation. φ =135°, θ The left-hand circularly polarized beam scanning range is 0° to -45°, and the scanning gain decreases by no more than 1.2 dB; at the same time, the beam pointing remains stable under right-hand circularly polarized excitation, and the gain fluctuation is less than 0.7 dB.

7. A control method for implementing the reconfigurable polarization-decoupled dual-circular polarization reflection array according to any one of claims 1 to 6, characterized in that, Includes the following steps: Step 1: Set the side length of the all-metal reflective array D The focal length was determined based on the radiation characteristics of the Ku-band dual-circular polarized feed and the side length of the all-metal reflector array. F ; Step 2: Based on the positional relationship between the Ku-band dual-circularly polarized feed and the all-metal reflector obtained in Step 1, determine the illumination phase distribution of the Ku-band dual-circularly polarized feed on the surface of the all-metal reflector. Step 3: Based on the illumination phase distribution obtained in Step 2 and the required dual circular polarization beam direction, calculate the required dual circular polarization phase compensation amount for each unit of the all-metal reflective array, and convert it into a 1-bit × 1-bit dual circular polarization phase compensation form. Step 4: Based on the 1-bit × 1-bit dual circular polarization phase compensation distribution required for each unit obtained in Step 3, obtain the position state corresponding to each unit. Step 5: Based on the positional state of each unit obtained in Step 4, perform mechanical displacement and rotation operations on each unit to obtain the reflection array structure corresponding to the desired dual-circular polarized beam pointing. Step six: Place the Ku-band dual circularly polarized feed and the all-metal reflector array obtained in step five according to their positional relationship; Step 7: By switching the left-hand and right-hand circular polarization working states of the Ku-band dual circular polarization feed, the left-hand and right-hand circular polarization reflected beams are made to point in their respective directions. Step 8: By changing the position and state of each unit in the all-metal reflective array, the left-hand and right-hand circularly polarized reflective beams can perform beam scanning without interfering with each other within a certain spatial range.

8. A satellite communication antenna, characterized in that, The satellite communication antenna adopts the reconfigurable polarization-decoupled dual circular polarization reflector array as described in any one of claims 1 to 6.

9. A vehicle-mounted / airborne radar antenna, characterized in that, The vehicle-mounted / airborne radar antenna employs a reconfigurable polarization-decoupled dual-circular polarization reflector array as described in any one of claims 1 to 6.

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