Dual-frequency gradient phase reflector and design method thereof

Abstract

The invention relates to a dual-frequency gradient phase reflector and a design method thereof. The reflector comprises a plurality of phase response units which are sequentially arranged in a gradient manner and are square; the phase difference between the first phase response unit and the second phase response unit and the phase difference between the phase response units are 90 degrees; each phase response unit comprises a first resonance layer and a second resonance layer which are tightly attached, the first resonance layer comprises a first metal pattern layer and a first dielectric layer which are sequentially arranged from top to bottom, and the second resonance layer comprises a second metal pattern layer, a second dielectric layer and a metal backboard which are sequentially arranged from top to bottom; the first metal pattern layer is a square metal ring, and the second metal pattern layer is a square metal sheet. The reflector provided by the embodiment of the invention can work at two frequency bands at the same time, and the dual-band design can realize more efficient and more reliable signal coverage and transmission in a complex environment. The reflector adopts gradient phase design, and is compact in structure and easy to manufacture and deploy.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of phase reflectors, and in particular to a dual-frequency gradient phase reflector and a design method thereof. Background Art

[0002] With the continuous development of wireless communication technology, the requirements for signal coverage, transmission quality, and anti-interference capabilities are becoming increasingly stringent. Traditional wireless communication technologies face numerous challenges in many application scenarios, such as smart mines, complex urban environments, and large-scale industrial facilities. For example, signal transmission is easily blocked by obstacles such as terrain, buildings, and equipment, leading to signal attenuation, coverage blind spots, and communication interruptions. In particular, in specialized scenarios, such as underground mines, wireless signal transmission and coverage issues are particularly prominent due to the complex tunnel structure, dense equipment density, and severe electromagnetic interference.

[0003] To improve the transmission and coverage of wireless signals, electromagnetic reflector technology has gradually attracted attention. By adjusting the local electromagnetic response characteristics, tilt angle, and position of the reflector, electromagnetic reflectors can reflect the original signal at a specific angle and direction, thereby enhancing signal transmission and coverage. The 700MHz and 2.6GHz frequency bands each have unique advantages. The 700MHz band has low propagation loss, wide coverage, and strong penetration, making it suitable for wide-area signal coverage. The 2.6GHz band, on the other hand, has higher data transmission rates and better spectrum resources, making it suitable for high-capacity wireless communications. Therefore, the development of a dual-frequency gradient phase reflector operating in the 700MHz and 2.6GHz frequency bands is of great significance for improving signal coverage and communication quality in complex environments.

[0004] However, existing technologies have several limitations. First, once a passive electromagnetic reflector is fabricated, its function is fixed and cannot be dynamically adjusted to meet actual needs. Second, achieving arbitrary-angle reflection within a lower frequency range is a challenge with existing reflective metasurface array technology because the longer wavelengths require more units to achieve the desired reflection angle control precision. Specifically, the relatively long wavelength of low-frequency electromagnetic waves (700 MHz) makes them less sensitive to changes in object size, reducing the likelihood of reflection and increasing the difficulty of designing the reflective surface. In contrast, the shorter wavelength of high-frequency electromagnetic waves (2.6 GHz) makes them more easily compatible with object size, resulting in more efficient reflection. Furthermore, existing technologies suffer from significant energy and radiation losses, which limit their efficiency and performance in practical applications. The energy difference between the frequency of low-frequency electromagnetic waves and the electronic energy levels of atoms and molecules in matter is greater, resulting in less interaction. This interaction makes low-frequency electromagnetic waves less easily absorbed and reflected by objects, resulting in higher surface losses in the reflective surface. High-frequency electromagnetic waves (2.6 GHz), on the other hand, interact more significantly with matter due to their higher frequency, resulting in relatively higher reflection efficiency. Furthermore, achieving dual-frequency operation requires designing an electromagnetic metasurface that takes into account the response characteristics of both frequencies. Electromagnetic waves of different frequencies may respond differently to the metasurface, and the design must ensure that the metasurface can effectively reflect and control the surface in both frequency bands. This increases the complexity of the design, especially when dealing with frequency-dependent material parameters and structural properties.

[0005] In addition, existing dual-frequency electromagnetic metasurface designs are mostly focused on high-frequency bands, such as 3.5GHz and 5GHz, with less research on dual-frequency designs that combine low and medium frequencies, such as 700MHz and 2.6GHz. The longer wavelength of electromagnetic waves in the 700MHz band places higher demands on the structural design of the reflector, requiring it to ensure low-frequency reflection performance while taking into account the high-frequency characteristics of the 2.6GHz band. At the same time, the frequency difference between the 700MHz and 2.6GHz bands is large, and how to achieve effective control of these two frequency bands on the same reflector is an urgent problem that needs to be solved.

[0006] Therefore, it is necessary to improve one or more problems existing in the above-mentioned related technical solutions.

[0007] It should be noted that this section is intended to provide background or context for the technical solutions of the present disclosure stated in the claims. The description herein is not admitted to be prior art by virtue of being included in this section. Summary of the Invention

[0008] The purpose of the embodiments of the present disclosure is to provide a dual-frequency gradient phase reflector and a design method thereof, thereby overcoming one or more problems caused by the limitations and defects of the related art at least to a certain extent.

[0009] The present disclosure first provides a dual-frequency gradient phase reflector, the reflector comprising:

[0010] a plurality of first phase response units, a plurality of second phase response units, a plurality of third phase response units, and a plurality of fourth phase response units, all of which are arranged in a gradient manner and are square in shape; a phase difference between the first phase response unit and the second phase response unit, a phase difference between the second phase response unit and the third phase response unit, and a phase difference between the third phase response unit and the fourth phase response unit are all 90°;

[0011] The above four phase response units all include a first resonant layer and a second resonant layer that are tightly fitted together. Each of the first resonant layers includes a first metal pattern layer and a first dielectric layer arranged in sequence up and down. Each of the second resonant layers includes a second metal pattern layer, a second dielectric layer and a metal backplate arranged in sequence up and down. Each of the first metal pattern layers is a square metal ring, and each of the second metal pattern layers is a square metal sheet.

[0012] In one embodiment of the present disclosure, the thickness of all the first dielectric layers is 5 mm, and the thickness of all the second dielectric layers is 2 mm.

[0013] In one embodiment of the present disclosure, a plurality of the first phase response units, the second phase response units, the third phase response units and the fourth phase response units are arranged in a 20*20 array.

[0014] In one embodiment of the present disclosure, the inner edges of the metal rings of the first metal pattern layers of the first phase response unit and the second phase response unit are both 57 mm, the inner edges of the metal rings of the first metal pattern layers of the third phase response unit and the fourth phase response unit are both 56 mm, and the outer edges of the metal rings of the first metal pattern layers of the four phase response units are all 58 mm; the side lengths of the metal sheets of the second metal pattern layers of the first phase response unit, the second phase response unit, the third phase response unit, and the fourth phase response unit are respectively 31.2 mm, 30.8 mm, 28.5 mm, and 32 mm.

[0015] In one embodiment of the present disclosure, the metal material of the first metal pattern layer and the second metal pattern layer is copper; the material of the first dielectric layer and the second dielectric layer is F4B; the side lengths of the first phase response unit, the second phase response unit, the third phase response unit and the fourth phase response unit are all 60 mm.

[0016] The present disclosure further provides a method for designing a dual-frequency gradient phase reflector. The dual-frequency gradient phase reflector described in any one of the above items is designed. The method includes:

[0017] Constructing an initial model of a phase response unit, the initial model comprising: a first resonant layer and a second resonant layer, wherein the first resonant layer comprises a first metal pattern layer and a first dielectric layer arranged in sequence above and below, and the second resonant layer comprises a second metal pattern layer, a second dielectric layer, and a metal backplate arranged in sequence above and below, wherein the first metal pattern layers are square metal rings, and the second metal pattern layers are square metal sheets;

[0018] In the frequency range of 0 to 3.5 GHz, multiple intervals are set for the first dielectric layer and the second dielectric layer, and a simulation analysis is performed on the phase and amplitude of the phase response unit at different intervals;

[0019] From the simulation analysis results, the phase response units with the highest amplitude and the phase closest to 0°, 90°, 180°, and 270° at 700MMHz and 2.6GHz were selected;

[0020] Select four phase response units with phase differences of 0°, 90°, 180°, and 270°, respectively, and reflection amplitudes close to 0.9, calculate the phase distribution under preset incident waves and multiple reflection angles, and arrange the phase response units in an array according to the phase distribution to obtain a reactor simulation model;

[0021] The reactor entity is designed according to the parameters of the simulation model.

[0022] In one embodiment of the present disclosure, the preset incident wave is a vertically incident electromagnetic wave.

[0023] In one embodiment of the present disclosure, the multiple reflection angles are: 15°, 30° and 45°.

[0024] In one embodiment of the present disclosure, the generalized Snell's law is used to calculate the phase distribution under a preset incident wave and multiple reflection angles.

[0025] The technical solutions provided by the embodiments of the present disclosure may have the following beneficial effects:

[0026] A dual-frequency gradient phase reflector and its design method in the embodiment of the present disclosure can operate in two frequency bands simultaneously, such as 700MHz and 2.6GHz, and can combine the advantages of low frequency band such as low propagation loss, wide coverage, and strong penetration ability with the advantages of medium frequency band such as high data transmission efficiency and rich spectrum resources. The dual-band design can achieve more efficient and reliable signal coverage and transmission in complex environments, and is particularly suitable for scenarios such as underground mines, complex urban terrain, and large industrial facilities. The reflector adopts a gradient phase design, has a compact structure, and is easy to manufacture and deploy. Its design does not require complex power supply support, reducing deployment costs and maintenance difficulties. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification, are used to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0028] Figure 1 is a structural diagram of a phase response unit in an exemplary embodiment of the present invention;

[0029] Figure 2 is a bottom view of a phase response unit in an exemplary embodiment of the present invention;

[0030] Figure 3 is a side view of a phase response unit in an exemplary embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of a reflector structure of a 20*20 array in an exemplary embodiment of the present invention;

[0032] Figure 5 Graphs showing the reflectivity and phase distribution of the four phase response units of the present invention to vertically incident 700 MHz electromagnetic waves;

[0033] Figure 6 The dual-frequency gradient phase reflector of this application emits a 15° phase distribution (6a), far-field scattering (6b), normalized radiation direction (6c), and radiation energy simulation result (6d) under vertical incidence of 700MHz electromagnetic waves;

[0034] Figure 7 The dual-frequency gradient phase reflector of the present application emits a 30° phase distribution (7a), far-field scattering (7b), normalized radiation direction (7c), and radiation energy simulation result (7d) under vertical incidence of 700 MHz electromagnetic waves;

[0035] Figure 8 The dual-frequency gradient phase reflector of the present application, under vertical incidence of 700MHz electromagnetic wave, emits 45° phase distribution (8a), far-field scattering (8b), normalized radiation direction (8c), and radiation energy simulation result diagram (8d);

[0036] Figure 9 The reflectivity and phase distribution diagram of the four basic unit structures of the present invention to the vertically incident 2.6GHz electromagnetic wave;

[0037] Figure 10The dual-frequency gradient phase reflector of the present application emits a 15° phase distribution (10a), far-field scattering (10b), normalized radiation direction (10c), and radiation energy simulation result diagram (10d) under vertical incidence of 2.6 GHz electromagnetic waves;

[0038] Figure 11 The dual-frequency gradient phase reflector of the present application emits a 30° phase distribution (11a), far-field scattering (11b), normalized radiation direction (11c), and radiation energy simulation result diagram (11d) under vertical incidence of 2.6 GHz electromagnetic waves;

[0039] Figure 12 The dual-frequency gradient phase reflector of the present application emits a 45° phase distribution (12a), far-field scattering (12b), normalized radiation direction (12c), and radiation energy simulation result diagram (12d) under vertical incidence of 2.6 GHz electromagnetic waves;

[0040] Figure 13 This is a simulation diagram of the present invention testing the array's ability to control signals in a lane;

[0041] Figure 14 This is a real picture of the reflector installed in the lane of the present invention;

[0042] Figure 15 This is an actual test diagram of the present invention in a lane;

[0043] Figure 16 This is a test data diagram of the present invention when no reflector is installed in the lane;

[0044] Figure 17 This is a test data diagram of the reflector installed in the lane of the present invention;

[0045] Figure 18 This is a comparative test data diagram of the present invention in the tunnel.

[0046] Reference numerals:

[0047] 10. Phase response unit; 11. First resonant layer; 111. First metal pattern layer; 112. First dielectric layer; 12. Second resonant layer; 121. Second metal pattern layer; 122. Second dielectric layer; 123. Metal backplane. DETAILED DESCRIPTION

[0048] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0049] In addition, the accompanying drawings are merely schematic illustrations of embodiments of the present disclosure and are not necessarily drawn to scale. Like reference numerals in the figures represent like or similar parts, and thus repeated descriptions thereof will be omitted. Some of the blocks shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically separate entities.

[0050] In this example embodiment, a dual-frequency gradient phase reflector is first provided. Figure 1 The reflector includes: a plurality of first phase response units, a plurality of second phase response units, a plurality of third phase response units, and a plurality of fourth phase response units. Each of the above phase response units 10 is square in shape and arranged in a gradient. The phase difference between the first phase response unit and the second phase response unit, the phase difference between the second phase response unit and the third phase response unit, and the phase difference between the third phase response unit and the fourth phase response unit are all 90°.

[0051] Each phase response unit 10 includes a tightly fitted first resonant layer 11 and a second resonant layer 12. Each first resonant layer 11 includes a first metal pattern layer 111 and a first dielectric layer 112 arranged in a vertical sequence. Each second resonant layer 12 includes a second metal pattern layer 121, a second dielectric layer 122, and a metal backplate 123 arranged in a vertical sequence. Each first metal pattern layer 111 is a square metal ring, and each second metal pattern layer is a square metal sheet.

[0052] In this embodiment, the reflector can operate simultaneously in two frequency bands, such as 700 MHz and 2.6 GHz. This combines the advantages of the low-frequency band, such as low propagation loss, wide coverage, and strong penetration, with the advantages of the mid-frequency band, such as high data transmission efficiency and abundant spectrum resources. This dual-band design enables more efficient and reliable signal coverage and transmission in complex environments, and is particularly suitable for scenarios such as underground mines, complex urban terrain, and large industrial facilities. The reflector utilizes a gradient phase design, resulting in a compact structure that is easy to manufacture and deploy. This design does not require complex power supply support, reducing deployment costs and maintenance difficulties.

[0053] The structures and parameters of each part of the dual-frequency gradient phase reflector of the present application are described in more detail below.

[0054] Each phase response unit 10 is a square with a side length of 60 mm. Each phase response unit 10 includes a first resonance layer 11 and a second resonance layer 12 that are tightly attached to each other.

[0055] First, the first resonant layer 11 includes a first metal pattern layer 111 and a first dielectric layer 112, arranged in a top-to-bottom arrangement. The first metal pattern layer 111 is a square metal ring. The inner edges of the metal rings of the first metal pattern layer 111 of the first and second phase response units are both 57 mm, the inner edges of the metal rings of the first metal pattern layer 111 of the third and fourth phase response units are both 56 mm, and the outer edges of the metal rings of the first metal pattern layer 111 of all four phase response units are all 58 mm. The first dielectric layer 112 is made of F4B, 5 mm thick, 60 mm long, with a dielectric constant of 2.65 and a loss tangent of 0.001. F4B has high-temperature resistance, low dielectric loss, and excellent flame retardancy, making it suitable for use in complex environments such as underground mines, complex urban terrain, and large industrial facilities.

[0056] Second, the second resonant layer 12 comprises a second metal pattern layer 121, a second dielectric layer 122, and a metal backplate 123, arranged in a top-to-bottom order. The second metal pattern layer 121 is a square metal sheet. The second dielectric layer 122 is 2 mm thick and 60 mm long, and is made of F4B with a dielectric constant of 2.65 and a loss tangent of 0.001. The metal backplate 123 is 0.035 mm thick and 60 mm long, and is made of copper.

[0057] In the above structure, the first metal pattern layer 111 and the second metal pattern layer 121 can both be made of pure copper with a thickness of 0.035 mm and a loss tangent value of 5.96e+007 [S / m].

[0058] The sizes of the second metal pattern layers 121 of the first, second, third, and fourth phase response units are different: 28.5 mm, 30.8 mm, 31.2 mm, and 32 mm, respectively. Therefore, the four phase response units 10 are represented by the units "00," "01," "10," and "11," based on the size of the second metal pattern layer 121. The inner dimensions of their first metal pattern layers 111 are 57 mm, 57 mm, 56 mm, and 56 mm, respectively, and the outer dimensions are 58 mm.

[0059] Since the phases of the four phase response units 10 are arranged in a gradient, the phase difference between the "00" unit and the "01" unit is set to 90°, the phase difference between the "01" unit and the "10" unit is set to 90°, and the phase difference between the "10" unit and the "11" unit is set to 90°. The final arrangement is a 20*20 unit array. This array is a 700MHz and 2.6GHz gradient phase reflector, which can deflect the incident electromagnetic wave at a certain angle to achieve the purpose of enhancing the signal in the desired direction.

[0060] This exemplary embodiment further provides a design method for a dual-frequency gradient phase reflector, which designs the reflector described in any of the above embodiments. The design method includes steps S101 to S105. The details are as follows:

[0061] Step S101: Construct an initial model of the phase response unit 10. The initial model includes a first resonant layer 11 and a second resonant layer 12. The first resonant layer 11 includes a first metal pattern layer 111 and a first dielectric layer 112 arranged in a vertical sequence. The second resonant layer 12 includes a second metal pattern layer 121, a second dielectric layer 122, and a metal backplane 123 arranged in a vertical sequence. The first metal pattern layer 111 is a square metal ring, and the second metal pattern layer 121 is a square metal sheet. Model construction and simulation analysis can be performed using CST Microwave Studio software.

[0062] In step S102, multiple intervals are set between the first dielectric layer 112 and the second dielectric layer 122 within a frequency range of 0 to 3.5 GHz, and the phase and amplitude of the phase response unit 10 at different intervals are simulated and analyzed. Specifically, the effects of different dielectric layer thicknesses and intervals on the phase and amplitude are analyzed.

[0063] Step S103 , selecting the phase response units 10 with the highest amplitude and the phase closest to 0°, 90°, 180°, and 270° at 700 MHz and 2.6 GHz from the simulation analysis results.

[0064] In step S104, four phase response units 10 are selected, each having phase differences of 0°, 90°, 180°, and 270°, and a reflection amplitude close to 0.9. The phase distribution under a preset incident wave and multiple reflection angles is calculated. The phase response units 10 are arrayed based on the phase distribution to obtain a reactor simulation model. The phase distribution under a preset incident wave and multiple reflection angles can be calculated using MATLAB software and the generalized Snell's law.

[0065] The preset incident wave in the present application takes the reflection angle of the electromagnetic wave as 45° when the electromagnetic wave is incident vertically as an example. The multiple reflection angles are: 15°, 30° and 45°.

[0066] Step S105 , designing the reactor entity according to the parameters of the simulation model, and designing and manufacturing a 20*20 array.

[0067] In this embodiment, the reflector of the present invention can operate simultaneously in both the 700MHz and 2.6GHz frequency bands, combining the advantages of low propagation loss, wide coverage, and strong penetration in the low-frequency band with the high data transmission rate and abundant spectrum resources of the mid-frequency band. This dual-band design enables more efficient and reliable signal coverage and transmission in complex environments (such as underground mines, complex urban terrain, and large industrial facilities), meeting the signal coverage and data transmission rate requirements of different scenarios.

[0068] The following describes the test results of the dual-frequency gradient phase reflector of the present application.

[0069] Please refer to Figure 5 , Figure 5 The amplitude (5a) and phase distribution diagram (5b) of the dual-frequency gradient phase reflector of the present application when simulating vertical incidence of electromagnetic waves are obtained. Figure 5 It can be seen that the reflectivity at the frequency of 700 MHz reaches above 0.9, and the phase difference of the four phase response units 10 is close to 90°.

[0070] Figure 6 The dual-frequency gradient phase reflector of this application emits a 15° phase distribution (6a), far-field scattering (6b), normalized radiation direction (6c), and radiation energy simulation result diagram (6d) under vertical incidence of 700MHz electromagnetic waves.

[0071] Figure 7 The dual-frequency gradient phase reflector of the present application emits a 30° phase distribution (7a), far-field scattering (7b), normalized radiation direction (7c), and radiation energy simulation result diagram (7d) under vertical incidence of 700MHz electromagnetic waves.

[0072] Figure 8 The dual-frequency gradient phase reflector of the present application emits a 45° phase distribution (8a), far-field scattering (8b), normalized radiation direction (8c), and radiation energy simulation result diagram (8d) under vertical incidence of 700MHz electromagnetic waves.

[0073] Where φ is the azimuth of the reflected wave. Figures 6 to 8 It can be seen that the reflector of the present application responds well to the 700 MHz incident electromagnetic wave.

[0074] Figure 9 The amplitude (9a) and phase distribution diagram (9b) of the reflector of this application when simulating vertical incidence of electromagnetic waves. Figure 9 It can be seen that the reflectivity at the frequency of 2.6 GHz reaches above 0.9, and the phase difference of the four unit structures is close to 90°.

[0075] Figure 10The dual-frequency gradient phase reflector of the present application emits a 15° phase distribution (10a), far-field scattering (10b), normalized radiation direction (10c), and radiation energy simulation result diagram (10d) under vertical incidence of 2.6 GHz electromagnetic waves.

[0076] Figure 11 The dual-frequency gradient phase reflector of this application emits a 30° phase distribution (11a), far-field scattering (11b), normalized radiation direction (11c), and radiation energy simulation result diagram (11d) under vertical incidence of 2.6 GHz electromagnetic waves.

[0077] Figure 12 The dual-frequency gradient phase reflector of the present application emits a 45° phase distribution (12a), far-field scattering (12b), normalized radiation direction (12c), and radiation energy simulation result diagram (12d) under vertical incidence of 2.6 GHz electromagnetic waves.

[0078] from Figures 10 to 12 It can be seen that the reflector of the present application responds well to the 2.6 GHz incident electromagnetic wave.

[0079] The reflector of this application is installed in the coal mine tunnel for testing. Figure 13 Arrange as shown. Figure 14 This is a physical picture of the reflector of this application. Figure 15 This is a test chart for actually testing the reflector of this application. Figure 16 This is a test diagram of electromagnetic waves in a roadway without the reflector of this application installed; Figure 17 A diagram of electromagnetic wave testing of a roadway for installing the reflector of this application; Figure 18 for Figure 16 and Figure 17 Comparative test data chart.

[0080] Depend on Figure 16 It can be seen that without the reflector of the present application, the amplitude of the electromagnetic wave reflection decreases with increasing distance, showing a linear attenuation. When the distance is 100m from the base station, the signal amplitude is -80.2dB, at which point the signal attenuation is relatively large.

[0081] Depend on Figure 17 It can be seen that when the reflector of the present application is installed, the amplitude of electromagnetic wave reflection decreases with increasing distance, showing a linear attenuation. Figure 17 The electromagnetic wave reflection amplitude increases significantly. When the distance from the base station is 100m, the signal amplitude is -76.0dB, and the signal attenuation is small at this time.

[0082] Depend on Figures 16 to 18It can be seen that after the reflector of the present application is deployed in the center of the main tunnel, the branch tunnel is completely covered by the wireless signal, achieving full coverage of the electromagnetic signal.

[0083] In summary, this application has the following beneficial effects:

[0084] (1) Advantages of dual-band collaborative coverage: The reflector of the present invention can operate simultaneously in both the 700MHz and 2.6GHz frequency bands, combining the advantages of low propagation loss, wide coverage, and strong penetration in the low-frequency band with the high data transmission rate and rich spectrum resources in the mid-frequency band. This dual-band design can achieve more efficient and reliable signal coverage and transmission in complex environments (such as underground mines, complex urban terrain, and large industrial facilities), meeting the requirements of signal coverage and data transmission rate in different scenarios.

[0085] (2) Efficient energy utilization and low loss: By optimizing the structural design and material selection of the reflective surface, the reflector achieves efficient electromagnetic wave reflection in both the 700MHz and 2.6GHz frequency bands, significantly reducing energy loss and radiation loss. This not only improves signal transmission efficiency and reduces energy waste, but also enhances the overall performance of the system, reducing operating costs while ensuring communication quality.

[0086] (3) Strong adaptability to complex environments: It can work stably in complex electromagnetic environments and effectively resist external interference. Its design fully considers the propagation characteristics of electromagnetic waves in different frequency bands. In scenarios with severe electromagnetic interference and complex terrain, such as underground mines, it can also significantly improve signal coverage, reduce signal blind spots, and improve communication quality, providing strong guarantees for communication stability in special scenarios.

[0087] (4) Easy to deploy and cost-effective: The gradient phase design is compact and easy to manufacture and deploy. No complex power supply is required, reducing deployment costs and maintenance difficulties. At the same time, by optimizing the structure and material of the reflective surface, efficient signal control is achieved, reducing dependence on additional communication equipment, further reducing the overall cost of the system, and having a high cost-effectiveness, it is easy to promote and apply on a large scale.

[0088] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are protected by the present invention.

Claims

1. Dual-frequency gradient phase reflector, characterized in that: The reflector comprises: a plurality of first phase response units, a plurality of second phase response units, a plurality of third phase response units, and a plurality of fourth phase response units, all of which are arranged in a gradient manner and are square in shape; a phase difference between the first phase response unit and the second phase response unit, a phase difference between the second phase response unit and the third phase response unit, and a phase difference between the third phase response unit and the fourth phase response unit are all 90°; The above four phase response units all include a first resonant layer and a second resonant layer that are tightly fitted together. Each of the first resonant layers includes a first metal pattern layer and a first dielectric layer arranged in sequence up and down. Each of the second resonant layers includes a second metal pattern layer, a second dielectric layer and a metal backplate arranged in sequence up and down. Each of the first metal pattern layers is a square metal ring, and each of the second metal pattern layers is a square metal sheet.

2. The dual-frequency gradient phase reflector according to claim 1, characterized in that: The thickness of all the first dielectric layers is 5 mm, and the thickness of all the second dielectric layers is 2 mm.

3. The dual-frequency gradient phase reflector according to claim 2, characterized in that: The plurality of first phase response units, second phase response units, third phase response units and fourth phase response units are arranged in a 20*20 array.

4. The dual-frequency gradient phase reflector according to claim 2, characterized in that: The inner edges of the metal rings of the first metal pattern layers of the first phase response unit and the second phase response unit are both 57 mm, the inner edges of the metal rings of the first metal pattern layers of the third phase response unit and the fourth phase response unit are both 56 mm, and the outer edges of the metal rings of the first metal pattern layers of the four phase response units are all 58 mm; the side lengths of the metal sheets of the second metal pattern layers of the first phase response unit, the second phase response unit, the third phase response unit, and the fourth phase response unit are respectively: 31.2 mm, 30.8 mm, 28.5 mm, and 32 mm.

5. The dual-frequency gradient phase reflector according to any one of claims 1 to 4, characterized in that: The metal material of the first metal pattern layer and the second metal pattern layer is copper; the material of the first dielectric layer and the second dielectric layer are both F4B; the side lengths of the first phase response unit, the second phase response unit, the third phase response unit and the fourth phase response unit are all 60 mm.

6. A design method for a dual-frequency gradient phase reflector, characterized in that: The reflector according to any one of claims 1 to 5 is designed, wherein the design method comprises: Constructing an initial model of a phase response unit, the initial model comprising: a first resonant layer and a second resonant layer, wherein the first resonant layer comprises a first metal pattern layer and a first dielectric layer arranged in sequence above and below, and the second resonant layer comprises a second metal pattern layer, a second dielectric layer, and a metal backplate arranged in sequence above and below, wherein the first metal pattern layers are square metal rings, and the second metal pattern layers are square metal sheets; In the frequency range of 0 to 3.5 GHz, multiple intervals are set for the first dielectric layer and the second dielectric layer, and a simulation analysis is performed on the phase and amplitude of the phase response unit at different intervals; From the simulation analysis results, the phase response units with the highest amplitude and the phase closest to 0°, 90°, 180°, and 270° at 700MMHz and 2.6GHz were selected; Select four phase response units with phase differences of 0°, 90°, 180°, and 270°, respectively, and reflection amplitudes close to 0.9, calculate the phase distribution under preset incident waves and multiple reflection angles, and arrange the phase response units in an array according to the phase distribution to obtain a reactor simulation model; The reactor entity is designed according to the parameters of the simulation model.

7. The design method of the dual-frequency gradient phase reflector according to claim 6, characterized in that: The preset incident wave is a vertically incident electromagnetic wave.

8. The design method of the dual-frequency gradient phase reflector according to claim 6, characterized in that: The multiple reflection angles are: 15°, 30° and 45°.

9. The design method of a dual-frequency gradient phase reflector according to any one of claims 6 to 8, characterized in that: The generalized Snell's law is used to calculate the phase distribution under a preset incident wave and multiple reflection angles.

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