CN107863607B - Low-loss electromagnetic induction transparent metamaterial structure based on ring dipole resonance - Google Patents
Low-loss electromagnetic induction transparent metamaterial structure based on ring dipole resonance Download PDFInfo
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Abstract
The invention discloses a low-loss electromagnetic induction transparent metamaterial structure based on ring dipole resonance, and belongs to the technical field of metamaterials. Transparent metamaterial structure of low-loss electromagnetic induction based on ring dipole resonance includes: a dielectric substrate, the dielectric substrate is rectangular; the I-shaped metal wire is etched on the upper surface of the dielectric substrate, and the long edge of the I-shaped metal wire is parallel to the symmetry axis of the long edge direction of the dielectric substrate; the first resonator is etched on the upper surface of the dielectric substrate and is positioned on one side of the long edge of the I-shaped metal wire; and the second resonator is etched on the upper surface of the dielectric substrate and symmetrically arranged on the other side of the long side of the I-shaped metal wire with the first resonator, and the first resonator and the second resonator are both spiral structures formed by rotating rectangular structures with the same width and different lengths for 7 times. The invention utilizes destructive interference of an electromagnetic field between the electric ring dipole resonance and the electric dipole resonance to inhibit radiation loss of the metamaterial and improve the transmission coefficient.
Description
Technical Field
The invention belongs to the technical field of metamaterials, and particularly relates to a low-loss electromagnetic induction transparent metamaterial structure based on ring dipole resonance.
Background
The metamaterial is an artificial electromagnetic structure, and because the constituent elements of the metamaterial can be designed at will, the metamaterial has many abnormal electromagnetic properties, such as electromagnetic stealth, electromagnetic induction transparency effect, asymmetric transmission, polarization control and the like, which cannot be realized by using natural materials. Although metamaterials have many important electromagnetic properties, their performance is limited by the occurrence of losses. In particular, when the losses are large, the performance of the metamaterial and metamaterial-based devices deteriorates and even fails to function.
The loss of the metamaterial includes two parts: ohmic losses and radiative losses. Ohmic losses can be reduced by using good conductors or all dielectric materials. While the dominant radiation loss can be suppressed by using destructive interference of the electromagnetic field between the bright state resonance and the dark state resonance, i.e. the classical electromagnetic induction transparency effect. Generally, electric dipole resonance is used as the bright state resonance, and magnetic dipole resonance is used as the dark state resonance. While the ring dipole resonance, which is the third type of resonance, is often ignored because the electromagnetic properties of the ring dipole are generally covered by stronger electrical and magnetic resonances. Currently, many studies show that such ring dipole resonance has many important electromagnetic applications, and especially the metamaterial based on the ring dipole weakly couples electromagnetic waves, and the radiation loss of the metamaterial is very low. Therefore, the electromagnetic induction transparency effect and the ring dipole resonance are effectively combined together, and the radiation loss of the metamaterial can be minimized. Although research groups in recent years propose an electromagnetic induction transparent metamaterial based on ring dipole resonance, the unit structure is either three-dimensional and inconvenient to integrate with the existing microwave millimeter wave circuit, or the structure is complex and inconvenient to process and manufacture in a high frequency band.
Disclosure of Invention
The invention aims to solve the problems of large loss, complex structure and inconvenience in integration of the existing metamaterial, and provides a low-loss electromagnetic induction transparent metamaterial structure based on ring dipole resonance, which is simple in structure, thin in thickness and convenient to integrate.
Transparent metamaterial structure of low-loss electromagnetic induction based on ring dipole resonance includes:
the dielectric substrate is rectangular;
the I-shaped metal wire is etched on the upper surface of the dielectric substrate, the long edge of the I-shaped metal wire is parallel to the symmetry axis of the long edge direction of the dielectric substrate, and the center of the I-shaped metal wire is coincided with the center of the dielectric substrate;
the first resonator is etched on the upper surface of the dielectric substrate and is positioned on one side of the long edge of the I-shaped metal wire;
and the second resonator is etched on the upper surface of the dielectric substrate and symmetrically arranged on the other side of the long side of the I-shaped metal wire with the first resonator, and the first resonator and the second resonator are both of spiral structures formed by 7 times of rotation of rectangular structures with the same width and different lengths.
Preferably, the dielectric substrate has a length of 16mm, a width of 9.2mm, a dielectric constant of 4.3 and a loss tangent of 0.01.
Preferably, the length of the short side of the I-shaped metal wire is 4mm, the width of the I-shaped metal wire is 1mm, the length of the long side of the I-shaped metal wire is 13.2mm, and the width of the long side of the I-shaped metal wire is 1 mm.
Preferably, the spiral structure of the second resonator is rotated 180 degrees about the center of the drum wire with respect to the first resonator.
Preferably, the thickness of the low-loss electromagnetic induction transparent metamaterial structure based on ring dipole resonance is 0.5 mm.
Preferably, the length of the long side of the rectangular structure in the helical structure formed by 7 times of rotation is 1.65mm, 1.2mm, 2.8mm, 1.9mm, 3.5mm, 2.6mm and 3.5mm in sequence along the direction of rotation, and the width of the rectangle in the helical structure formed by 7 times of rotation is the same, and the width is 1 mm.
Preferably, the vertical distance of the bottom edge of the first resonator from the long side of the drum wire is 0.425 mm.
Preferably, the vertical distance of the top edge of the second resonator from the long side of the drum wire is 0.425 mm.
The features mentioned above can be combined in various suitable ways or replaced by equivalent features as long as the object of the invention is achieved.
The low-loss electromagnetic induction transparent metamaterial based on ring dipole resonance has the advantages that the low-loss electric ring dipole response is realized by reasonably distributing the constituent elements of the metamaterial, the destructive interference of an electromagnetic field between the electric ring dipole resonance and the electric dipole resonance is further utilized, the radiation loss of the metamaterial is inhibited, the transmission coefficient is improved, the low-loss metamaterial is finally realized, and the low-loss transparent metamaterial has the advantages of simple structure and convenience in integration.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a low-loss electromagnetic induction transparent metamaterial structure based on ring dipole resonance according to the present invention;
FIG. 2 is a graph of the transmission coefficient of a spiral resonator;
FIG. 3 is a schematic diagram of the magnetic field distribution of the spiral resonator at a frequency of 5.41 GHz;
FIG. 4 is a graph diagram illustrating simulation results and measurement results of the transmission coefficient of the metamaterial structure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
As shown in fig. 1, the low-loss electromagnetic induction transparent metamaterial structure based on ring dipole resonance comprises:
a dielectric substrate 4, wherein the dielectric substrate 4 is rectangular;
the I-shaped metal wire 1 is etched on the upper surface of the dielectric substrate 4, the long edge of the I-shaped metal wire 1 is parallel to the symmetry axis of the long edge direction of the dielectric substrate 4, and the center of the I-shaped metal wire 1 is superposed with the center of the dielectric substrate 4;
the first resonator 2 is etched on the upper surface of the dielectric substrate 4 and is positioned on the upper part of the long side of the I-shaped metal wire 1;
and a second resonator 3 etched on the upper surface of the dielectric substrate 4, symmetrically disposed on the lower portion of the long side of the i-type metal wire 1 with respect to the first resonator 2, wherein the first resonator 2 and the second resonator 3 are each a helical structure formed by 7 rotations (the rotation direction is counterclockwise) of a rectangular structure having the same width and different lengths.
Further, the length a of the dielectric substrate 4 was 16mm, the width b was 9.2mm, and the dielectric plate 4 was a dielectric, and had a dielectric constant of 4.3 and a loss tangent of 0.01. The overall structure of the drum wire 1, the first resonator 2, the second resonator 3 and the dielectric substrate 4 is a single layer metal surface. The thickness of the low-loss electromagnetic induction transparent metamaterial structure based on ring dipole resonance is 0.5 mm. The low-loss electromagnetic induction transparent metamaterial structure based on ring dipole resonance is a planar structure, only relates to a single-layer metal surface, and is convenient to process and use. Moreover, the dielectric substrate 4 is ultra-thin (about 0.009 λ), where λ represents a wavelength (a wavelength corresponding to a peak frequency of the transparent window), which is advantageous for integration with existing microwave and millimeter wave circuits.
Short side l of I-shaped metal wire 12Has a length of 4mm and a long side l1Is 13.2 mm. Each of the i-metal lines 1 has the same width, which is 1 mm.
In this embodiment, the transparent metamaterial structure of low-loss electromagnetic induction based on ring dipole resonance realizes the low-loss electric ring dipole response through the reasonable layout of the constituent elements of the metamaterial, and then utilizes destructive interference of an electromagnetic field between the electric ring dipole resonance and the electric dipole resonance to inhibit the radiation loss of the metamaterial, improve the transmission coefficient, finally realize the low-loss metamaterial, and has the advantages of simple structure and convenience in integration.
In the preferred embodiment, the spiral structure of the second resonator 3 is rotated 180 degrees about the center of the drum wire 1 (i.e., 180 degrees rotational symmetry about the X-axis) with respect to the first resonator 2.
In the embodiment, the low-loss electromagnetic induction transparent metamaterial structure based on ring dipole resonance is composed of a I-shaped metal wire 1 and two resonators in spiral structures. The two resonators are 180 degrees rotationally symmetric about the X axis and they are placed symmetrically on the longer arm of the drum wire 1 as shown in fig. 1.
In a preferred embodiment, the long sides of the rectangular structures in the helical structure formed by 7 times of rotation are sequentially l in length along the rotation direction5＝1.65mm，l7＝1.2mm，l4＝2.8mm，l8＝1.9mm，l3＝3.5mm，l6＝2.6mm，l33.5 mm. The rectangles of the first resonator 2 and the second resonator 3 are both the same in width, with a width of 1 mm.
In the preferred embodiment, the perpendicular distance S of the bottom side of the first resonator 2 from the long side of the drum wire 110.425 mm; the vertical distance S of the top edge of the second resonator 3 from the long side of the drum wire 12Is 0.425 mm.
As shown in fig. 2, when an x-polarized electromagnetic wave is incident, the two rotating spiral resonators produce low-loss, high-quality-factor resonance at 5.41 GHz. The magnetic field distribution at this resonance is shown in fig. 3. As can be seen from the figure, a circular magnetic field is distributed from the beginning to the end in the two spiral resonators, so that the resonance is a circular dipole resonance. In particular, the direction of the ring dipole moment is parallel to the electric field of the incident wave, and thus its resonance essentially belongs to the electric ring dipole resonance. When the drum-type metal wire 1 is added to the metamaterial unit with ring dipole response to form the low-loss electromagnetic induction transparent metamaterial structure based on ring dipole resonance shown in fig. 1, the radiation loss of the metamaterial is greatly suppressed and the transmission is improved based on the destructive interference of the electromagnetic field between the electric ring dipole resonance (induced by two spiral resonators) and the electric dipole resonance (induced by the drum-type metal wire), so that a low-loss transparent window appears at 5.41GHz as shown in fig. 4. The measurement result is well matched with the simulation result, and the effectiveness of the design of the low-loss electromagnetic induction transparent metamaterial is further verified.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (8)
1. Transparent metamaterial structure of low-loss electromagnetic induction based on ring dipole resonance, its characterized in that includes:
the dielectric substrate is rectangular;
the I-shaped metal wire is etched on the upper surface of the dielectric substrate, the long edge of the I-shaped metal wire is parallel to the symmetry axis of the long edge direction of the dielectric substrate, and the center of the I-shaped metal wire is coincided with the center of the dielectric substrate;
the first resonator is etched on the upper surface of the dielectric substrate and is positioned on one side of the long edge of the I-shaped metal wire;
and the second resonator is etched on the upper surface of the dielectric substrate and symmetrically arranged on the other side of the long side of the I-shaped metal wire with the first resonator, and the first resonator and the second resonator are both in a spiral structure formed by 7 times of rotation of rectangular structures with the same width and different lengths.
2. The ring dipole resonance-based low-loss electromagnetic induction transparent metamaterial structure as claimed in claim 1, wherein the dielectric substrate has a length of 16mm, a width of 9.2mm, a dielectric constant of 4.3, and a loss tangent of 0.01.
3. The ring dipole resonance-based low-loss electromagnetic induction transparent metamaterial structure as claimed in claim 1, wherein the length of the short side of the drum-shaped metal wire is 4mm, the width of the drum-shaped metal wire is 1mm, and the length of the long side of the drum-shaped metal wire is 13.2mm, and the width of the drum-shaped metal wire is 1 mm.
4. The ring dipole resonance-based low loss electromagnetic induction transparent metamaterial structure of claim 1, wherein the helical structure of the second resonator is rotated 180 degrees with respect to the first resonator centered around the center of the drum-type metal wire.
5. The ring dipole resonance-based low loss electromagnetic induction transparent metamaterial structure as claimed in claim 1, wherein the thickness of the ring dipole resonance-based low loss electromagnetic induction transparent metamaterial structure is 0.5 mm.
6. The transparent metamaterial structure with low loss and electromagnetic induction based on ring dipole resonance as claimed in claim 1, wherein the rectangular structures in the helical structure formed by 7 times of rotation have a length of 1.65mm, 1.2mm, 2.8mm, 1.9mm, 3.5mm, 2.6mm, 3.5mm in sequence along the direction of rotation, and the rectangular structures in the helical structure formed by 7 times of rotation have the same width, and the width is 1 mm.
7. The ring dipole resonance-based low-loss electromagnetic induction transparent metamaterial structure of claim 1, wherein the vertical distance of the first resonator bottom side from the long side of the drum-type metal wire is 0.425 mm.
8. The ring dipole resonance-based low loss electromagnetic induction transparent metamaterial structure of claim 1, wherein the vertical distance of the second resonator top edge from the long side of the drum metal wire is 0.425 mm.
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| A low-loss electromagnetically induced transparency (EIT) metamaterial based on coupling between electric and toroidal dipoles;Lei Zhu等;《RSC Advances》;20171211;第083511-1至083511-4页 * |
| Low-loss metamaterial electromagnetically induced transparency based on electric toroidal dipolar response;Hai-ming Li等;《Applied Physics Letters》;20150126;第55897-55904页 * |
| 电磁感应透明超介质研究;朱磊;《万方学位论文全文数据库》;20160504;论文正文第48-55页 * |
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