A broadband polarizer based on metamaterials

Abstract

The present invention discloses a broadband polarizer based on metamaterials. The first dielectric plate, the second dielectric plate, the third dielectric plate, the fourth dielectric plate and the copper ground plate are arranged in sequence. The first open resonant ring is arranged between the first dielectric plate and the second dielectric plate, the second open resonant ring is arranged between the second dielectric plate and the third dielectric plate, the third open resonant ring is arranged between the third dielectric plate and the fourth dielectric plate, and the first open resonant ring, the second open resonant ring and the third open resonant ring are arranged in a concentric circle pattern. The broadband polarizer based on metamaterials realizes a multi-layer resonant ring superposition structure with an overall height of 12.8 mm, and realizes more than 99% polarization conversion characteristics in a frequency band of 2.7 to 4.6 GHz.

Description

Technical Field

[0001] The present invention relates to the technical field of polarizers, and in particular to a broadband polarizer based on metamaterials. Background Art

[0002] Metamaterials usually refer to an artificial periodic structure that has physical properties that natural materials do not have. In recent years, metamaterials have attracted widespread attention from scholars for their unique electromagnetic properties. At the same time, metamaterials also have important application prospects in controlling the polarization state of electromagnetic waves. Polarization converters are devices that have the function of controlling the polarization direction of electromagnetic waves, and are very important devices in the application of electromagnetic wave propagation, especially in the fields of nanophotonic devices and advanced sensors. In addition, in the microwave band, polarization converters also play a vital role in the design of circularly polarized antennas and radar antenna covers. The polarization of electromagnetic waves refers to the way in which the magnitude and direction of the electric field of electromagnetic waves at any given point in space change with time. Traditional methods for achieving electromagnetic wave polarization control are often based on the birefringence effect and are achieved using dichroic solid-state crystals and twisted nematic liquid crystals. However, these traditional polarization conversion devices have certain disadvantages. The design process of these traditional polarization control devices is relatively complicated, the entire structure is thick, and the requirements for materials and processing technology are very high. Polarization converters based on electromagnetic metasurfaces can effectively avoid the shortcomings of the above-mentioned polarization conversion devices and achieve the requirements of broadband and multi-polarization conversion, which plays an important role in constructing multifunctional polarization conversion devices. Summary of the invention

[0003] The object of the present invention is to provide a broadband polarizer based on metamaterials with wide frequency bandwidth and high polarization conversion efficiency.

[0004] To achieve the above-mentioned purpose, the present invention adopts a broadband polarizer based on metamaterial, comprising a first dielectric plate, a second dielectric plate, a third dielectric plate, a fourth dielectric plate, a copper grounding plate, a first open resonant ring, a second open resonant ring and a third open resonant ring, wherein the first dielectric plate, the second dielectric plate, the third dielectric plate, the fourth dielectric plate and the copper grounding plate are arranged in sequence, the first open resonant ring is arranged between the first dielectric plate and the second dielectric plate, the second open resonant ring is arranged between the second dielectric plate and the third dielectric plate, the third open resonant ring is arranged between the third dielectric plate and the fourth dielectric plate, and the first open resonant ring, the second open resonant ring and the third open resonant ring are arranged in a concentric circle pattern.

[0005] Among them, the first open resonant ring opening has two first notches, and the two first notches are respectively located at 45° and 225° clockwise on the first open resonant ring; the second open resonant ring opening has two second notches, and the two second notches are respectively located at 135° and 315° clockwise on the second open resonant ring; the third open resonant ring opening has two third notches, and the two second notches are respectively located at 45° and 225° clockwise on the third open resonant ring.

[0006] Among them, the length and width dimensions of the first dielectric plate, the second dielectric plate, the third dielectric plate and the fourth dielectric plate are all 22 mm, the height of the first dielectric plate is 5 mm, the height of the second dielectric plate and the fourth dielectric plate are both 2.4 mm, and the height of the third dielectric plate is 3 mm.

[0007] The outer radius of the first open resonant ring is 4.8 mm, the inner radius is 4 mm, and the width of the first opening is 1.2 mm.

[0008] The outer radius of the second open resonant ring is 6.8 mm, the inner radius is 6 mm, and the width of the second opening is 1.2 mm.

[0009] The outer radius of the third open resonant ring is 8.8 mm, the inner radius is 8 mm, and the width of the third opening is 2 mm.

[0010] The length and width of the copper grounding plate are the same as those of the fourth dielectric plate.

[0011] The metamaterial-based broadband polarizer further includes a cross structure, which is arranged at the center of the first open resonant ring. The length of the cross structure is 7 mm and the width is 1.2 mm.

[0012] The present invention discloses a broadband polarizer based on metamaterials. The first dielectric plate, the second dielectric plate, the third dielectric plate, the fourth dielectric plate and the copper ground plate are arranged in sequence. The first open resonant ring is arranged between the first dielectric plate and the second dielectric plate, the second open resonant ring is arranged between the second dielectric plate and the third dielectric plate, the third open resonant ring is arranged between the third dielectric plate and the fourth dielectric plate, and the first open resonant ring, the second open resonant ring and the third open resonant ring are arranged in a concentric circle pattern. The broadband polarizer based on metamaterials realizes a multi-layer resonant ring superposition structure with an overall height of 12.8 mm, and realizes more than 99% polarization conversion characteristics in the 2.7 to 4.6 GHz frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a schematic structural diagram of a broadband polarizer based on metamaterials of the present invention.

[0015] Figure 2 It is a schematic diagram of the reflection coefficient of the broadband polarizer based on metamaterials of the present invention changing with frequency when the incident electromagnetic wave is a y-polarized wave.

[0016] Figure 3 It is a schematic diagram showing the polarization conversion efficiency of the broadband polarizer based on metamaterials of the present invention changing with frequency.

[0017] 1-first dielectric plate, 2-second dielectric plate, 3-third dielectric plate, 4-fourth dielectric plate, 5-copper grounding plate, 6-first open resonant ring, 7-second open resonant ring, 8-third open resonant ring, 9-cross structure, 61-first notch, 71-second notch, 81-third notch. DETAILED DESCRIPTION

[0018] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0020] See also Figure 1The present invention provides a broadband polarizer based on metamaterials, comprising a first dielectric plate 1, a second dielectric plate 2, a third dielectric plate 3, a fourth dielectric plate 4, a copper grounding plate 5, a first open resonant ring 6, a second open resonant ring 7 and a third open resonant ring 8, wherein the first dielectric plate 1, the second dielectric plate 2, the third dielectric plate 3, the fourth dielectric plate 4 and the copper grounding plate 5 are arranged in sequence, the first open resonant ring 6 is arranged between the first dielectric plate 1 and the second dielectric plate 2, the second open resonant ring 7 is arranged between the second dielectric plate 2 and the third dielectric plate 3, the third open resonant ring 8 is arranged between the third dielectric plate 3 and the fourth dielectric plate 4, and the first open resonant ring 6, the second open resonant ring 7 and the third open resonant ring 8 are arranged in a concentric circle pattern.

[0021] The first open resonant ring 6 has two first notches 61, and the two first notches 61 are respectively located at 45° and 225° clockwise on the first open resonant ring 6; the second open resonant ring 7 has two second notches 71, and the two second notches 71 are respectively located at 135° and 315° clockwise on the second open resonant ring 7; the third open resonant ring 8 has two third notches 81, and the two second notches 71 are respectively located at 45° and 225° clockwise on the third open resonant ring 8.

[0022] The length and width dimensions of the first dielectric plate 1, the second dielectric plate 2, the third dielectric plate 3 and the fourth dielectric plate 4 are all 22 mm, the height of the first dielectric plate 1 is 5 mm, the height of the second dielectric plate 2 and the fourth dielectric plate 4 are both 2.4 mm, and the height of the third dielectric plate 3 is 3 mm.

[0023] The outer radius of the first open resonant ring 6 is 4.8 mm, the inner radius is 4 mm, and the width of the first notch 61 is 1.2 mm.

[0024] The outer radius of the second open resonant ring 7 is 6.8 mm, the inner radius is 6 mm, and the width of the second notch 71 is 1.2 mm.

[0025] The outer radius of the third open resonant ring 8 is 8.8 mm, the inner radius is 8 mm, and the width of the third notch 81 is 2 mm.

[0026] The length and width of the copper grounding plate 5 are the same as those of the fourth dielectric plate 4 .

[0027] The metamaterial-based broadband polarizer further includes a cross structure 9 , which is disposed at the center of the first open resonant ring 6 . The cross structure 9 has a length of 7 mm and a width of 1.2 mm.

[0028] In this embodiment, the first dielectric plate 1 is rectangular and made of polytetrafluoroethylene, the second dielectric plate 2, the third dielectric plate 3 and the fourth dielectric plate 4 are all rectangular and made of FR4, the copper ground plate 5 is made of metal copper, and the length and width are both 22 mm. The first open resonant ring 6, the second open resonant ring 7, the third open resonant ring 8 and the cross structure 9 are all made of metal copper.

[0029] The present invention has also carried out simulation experiments on this, please refer to Figure 2 ,The simulation results show that the finally optimized metamaterial-based broadband polarizer achieves cross-polarization in the frequency range of 2.7 GHz to 4.6 GHz.

[0030] See also Figure 3 The simulation results show that the polarization conversion efficiency of the finally optimized broadband polarizer based on metamaterials reaches more than 99% in the frequency range of 2.7 GHz to 4.6 GHz.

[0031] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A broadband polarizer based on metamaterials, It is characterized in that The invention comprises a first dielectric plate, a second dielectric plate, a third dielectric plate, a fourth dielectric plate, a copper grounding plate, a first open resonant ring, a second open resonant ring and a third open resonant ring, wherein the first dielectric plate, the second dielectric plate, the third dielectric plate, the fourth dielectric plate and the copper grounding plate are arranged in sequence, the first open resonant ring is arranged between the first dielectric plate and the second dielectric plate, the second open resonant ring is arranged between the second dielectric plate and the third dielectric plate, the third open resonant ring is arranged between the third dielectric plate and the fourth dielectric plate, and the first open resonant ring, the second open resonant ring and the third open resonant ring are arranged in a concentric circle pattern; The broadband polarizer based on metamaterial further comprises a cross structure, wherein the cross structure is arranged at the center of the first open resonant ring, and the length of the cross structure is 7 mm and the width is 1.2 mm; The material of the first dielectric plate is polytetrafluoroethylene, and the material of the second dielectric plate, the third dielectric plate and the fourth dielectric plate is FR4.

2. The broadband polarizer based on metamaterials as claimed in claim 1, It is characterized in that The first open resonant ring has two first notches, which are respectively located at 45° and 225° clockwise on the first open resonant ring; the second open resonant ring has two second notches, which are respectively located at 135° and 315° clockwise on the second open resonant ring; the third open resonant ring has two third notches, which are respectively located at 45° and 225° clockwise on the third open resonant ring.

3. The metamaterial-based broadband polarizer according to claim 2, It is characterized in that The length and width of the first dielectric plate, the second dielectric plate, the third dielectric plate and the fourth dielectric plate are all 22 mm, the height of the first dielectric plate is 5 mm, the height of the second dielectric plate and the fourth dielectric plate are both 2.4 mm, and the height of the third dielectric plate is 3 mm.

4. The metamaterial-based broadband polarizer according to claim 3, It is characterized in that The outer radius of the first open resonant ring is 4.8 mm, the inner radius is 4 mm, and the width of the first opening is 1.2 mm.

5. The metamaterial-based broadband polarizer according to claim 4, It is characterized in that The outer radius of the second open resonant ring is 6.8 mm, the inner radius is 6 mm, and the width of the second opening is 1.2 mm.

6. The metamaterial-based broadband polarizer according to claim 5, It is characterized in that The outer radius of the third open resonant ring is 8.8 mm, the inner radius is 8 mm, and the width of the third opening is 2 mm.

7. The metamaterial-based broadband polarizer according to claim 6, It is characterized in that The length and width of the copper grounding plate are the same as those of the fourth dielectric plate.

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