CN109411897B - A Broadband Absorber Based on Gravity Field Control - Google Patents

Abstract

The invention relates to a broadband wave absorber based on the regulation of gravity field, comprising a bottom metal reflector plate, a medium structure is arranged on the bottom metal reflector plate, and the inside of the medium structure has first and second places for placing seawater and oil. There are two grooves, and there is a connecting part between the first and second grooves. The medium structure is composed of a U-shaped pipe structure placed on a cuboid structure in reverse, and an arc-shaped groove is opened on the top of the cuboid structure along the center line. , by rotating the absorber, under the action of the gravitational field, the position of the seawater and the oil is changed to achieve the purpose of frequency regulation; the absorber realizes the dynamic regulation of broadband absorption by means of dielectric resonance. The absorption frequency band is 8.12 to 10.84GHz, the reflection rate is lower than ‑10dB, and the absorption rate is higher than 90%; the absorption frequency band when horizontal rotation is 6.5 to 8.18GHz, the reflection rate is lower than ‑10dB, and the absorption rate is higher than 90%. This enables broadband absorption.

Description

A Broadband Absorber Based on Gravity Field Control

technical field

The invention relates to a wave absorber, in particular to a broadband wave absorber controlled by a gravitational field, and belongs to the fields of radio communication and microwave devices.

Background technique

As a rising periodical material based on artificial synthesis, metamaterials are often used for perfect imaging or manufacturing because of their many novel properties, such as negative reflectivity, negative refractive index, etc., which can produce many incredible physical phenomena. Absorber. Metamaterial absorbers are usually composed of periodically arranged units and have a small physical size. They can absorb electromagnetic waves in specific frequency bands through electrical resonance and magnetic resonance. Recently, they have been further developed to prevent electromagnetic interference and electromagnetic stealth. and other civil and military fields. As a new military device, the wave absorber can be used as a surface coating for various vehicles and weapons, so that it can be invisible in the detection of radar, so that the other party cannot detect our personnel. High military value, can also be used to reduce the RCS of various flying units such as missiles. In the civilian field, a large number of electronic products need to work without electromagnetic interference. Small wave absorbers can effectively solve such needs in detection and medical treatment, especially in the field of communication to avoid unnecessary electromagnetic interference. Further improve the quality of communication. As a metamaterial absorber, single-frequency point and narrow-band absorption can no longer meet the needs of current development, so the need for broadband absorbers arises. Or it is inconvenient to concentrate the original components for regulation, which greatly limits the practical application range of the absorber. The gravity field regulation does not require other means, and has a great advantage in the convenience of regulation.

This kind of broadband absorber based on gravity field control uses a convenient control method. By rotating the absorber, the dynamic control of the absorption frequency domain can be realized, so that the absorption frequency domain of the entire broadband can be changed. Convenience of control means. The processing materials of the wave absorber are easy to obtain, and the wave absorber itself is relatively small, flexible in design, and has a very wide range of application scenarios.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a broadband wave absorber based on the regulation of the gravitational field, which uses a simple gravitational field regulation method to realize the dynamic regulation of the broadband absorption frequency domain by rotating the wave absorber.

The present invention adopts the following technical solutions for solving the above-mentioned technical problems:

The invention provides a broadband wave absorber based on gravity field regulation, comprising a bottom metal reflector plate, a dielectric structure is arranged on the bottom metal reflector plate, and inside the dielectric structure there are first and second places for placing seawater and oil. There are two grooves, and there is a connecting part between the first and second grooves. The arc-shaped groove, by rotating the absorber, under the action of the gravity field, the seawater and the oil change the position to achieve the purpose of frequency regulation; the absorber realizes the dynamic regulation of broadband absorption by means of medium resonance , the absorption frequency band when not rotated is 8.12 to 10.84GHz, the reflectivity is lower than -10dB, and the absorption rate is higher than 90%; the absorption frequency band when horizontal rotation is 6.5 to 8.18GHz, the reflection rate is lower than -10dB, and the absorption rate is higher than 90%, thus achieving broadband absorption. The main resonance mode of the present invention is dielectric resonance, which is not the metal resonance mainly used in traditional wave absorbers. Seawater and oil inside the structure are used as the main resonance medium to absorb electromagnetic waves, and at the same time, the ingenious arrangement of the internal grooves achieves the effect of broadband absorption. .

As a further technical solution of the present invention, the first groove is a "U"-shaped body, located inside the "U"-shaped pipe structure, and oil is placed inside; the second groove is a right-angled "U"-shaped body, located in the "U" shape. Inside the cuboid structure, seawater is placed inside; the volumes of the first groove and the second groove are equal.

As a further technical solution of the present invention, the wave absorber has unrotated and horizontally rotated states:

When the wave absorber is not rotating, the second groove is located below the interior of the dielectric structure, and the first groove is located above the interior of the dielectric structure. Under the action of the gravitational field, the second groove is filled with seawater, and the first groove is filled with seawater. filled with oil;

When the wave absorber rotates horizontally, the second groove is located above the interior of the dielectric structure, and the first groove is located below the interior of the dielectric structure. Under the action of the gravitational field, the second groove is filled with oil, and the first groove is filled with oil. Filled with sea water.

The regulation method is realized by rotation, and the position of the seawater and oil inside the medium structure changes due to the rotation, so as to realize the dynamic regulation of the broadband absorption frequency domain.

As a further technical solution of the present invention, the outer diameter of the "U"-shaped pipe structure is 7mm, the inner diameter is 6mm, the length is 24mm, and the width is 14mm; the cuboid structure of the excavated part is 24mm long and 10mm wide; The excavated part is a semi-cylinder with a radius of 2mm; the inner groove consists of two cuboids with a length of 6mm, a width of 5.5mm and a height of 9.5mm, and a cuboid with a length of 6mm, a width of 3.46mm and a height of 12mm. The upper part of the cuboid has two cuboids with a radius of 7mm, the length is 10mm, the width is 7mm, and the thickness is 0.01mm.

As a further technical solution of the present invention, the control method is realized by rotation, and the position of the seawater and oil inside the dielectric substrate changes due to rotation, so as to realize the dynamic control of the absorption frequency domain.

As a further technical solution of the present invention, the material of the dielectric structure is glass.

As a further technical solution of the present invention, the material of the metal reflector is copper.

Compared with the prior art, the present invention adopts the above technical scheme, and has the following technical effects:

(1) The present invention is a broadband wave absorber based on gravitational field regulation. The method of realizing broadband absorption is dielectric resonance, rather than the metal resonance method mainly used by traditional wave absorbers, and has novelty in implementation.

(2) The present invention can realize broadband absorption in two different frequency bands only by the simple operation mode of rotation, so as to achieve the effect of conveniently regulating the absorption frequency domain.

(3) The design of the present invention is relatively ingenious, and a non-contact control method is used. At the same time, the metal part in the traditional wave absorber is removed from the device, which further increases the practicability, and has the advantages of easy acquisition of processing materials, novel design and structure. It is popular and has excellent application prospects.

Description of drawings

Figure 1 is a front view of the structural unit of a broadband absorber controlled by a gravitational field when it is not rotating.

Fig. 2 is a front view of the periodic structural unit arrangement (2*2) of a broadband absorber based on the regulation of the gravitational field.

FIG. 3 is a side view (perspective) view of a structural unit of a broadband absorber controlled by a gravitational field when it is not rotated.

FIG. 4 is a perspective view of a broadband wave absorber controlled by a gravitational field when it is not rotated.

FIG. 5 is a front view of the internal structure of the dielectric structure of a broadband wave absorber controlled by a gravitational field when it is not rotating.

FIG. 6 is a front view of the internal structure of the dielectric structure when a broadband wave absorber controlled by a gravitational field is rotated horizontally.

Figure 7 shows the absorption curve of a TM mode electromagnetic wave when the electromagnetic wave is vertically incident without rotation and horizontal rotation of a broadband absorber controlled by a gravitational field.

Description of drawings: 1-metal reflector, 2-first groove for oil, 3-media structure, 4-second groove for seawater.

Detailed ways

Below in conjunction with accompanying drawing, the technical scheme of the present invention is described in further detail:

The present invention provides a broadband wave absorber based on gravity field regulation, as shown in Figures 1 to 4, the structure of which is composed of a bottom metal reflector, a dielectric structure, and seawater and oil inside the dielectric structure. The material of the dielectric structure is glass. The first and second grooves are respectively a "U"-shaped body and a right-angled "U"-shaped body with equal volumes. Oil and seawater are injected into the grooves respectively. Since the volumes of the first and second grooves are equal, by rotating the wave absorber , so that the position of seawater and oil in the groove changes, so as to realize the controllability of the broadband absorption frequency domain.

The wave absorber of the present invention has two working states during operation, namely a non-rotating state and a horizontally rotating state. When the wave absorber is not rotating, the second groove is located below the interior of the dielectric structure, and the first groove is located above the interior of the dielectric structure. Under the action of the gravitational field, the second groove is filled with seawater, and the first groove is filled with seawater. Filled with oil; when the wave absorber rotates horizontally, the second groove is located above the interior of the medium structure, and the first groove is located below the interior of the medium structure. Under the action of the gravitational field, the second groove is filled with oil , the first groove is filled with seawater.

In the present invention, by adding grooves inside the dielectric structure, seawater and oil are used as the main resonant units, and the method of rotating the wave absorber is used to realize dynamic regulation of different frequency bands, and the absorber The wave device is composed of a periodic arrangement of structural units, as shown in Figure 2.

Below by specific embodiment, the technical scheme of the present invention is further elaborated:

A new type of wave absorber based on gravity field regulation of the invention has the following two working states: when it is in a non-rotating state, its schematic diagram is shown in Figure 5, the groove is placed in the forward direction, and the second groove is located in the Below the inside of the medium structure, the first groove is located above the inside of the medium structure. Since the density of seawater selected in this wave absorber is 1025kg/m ³ , and the density of the selected oil is 920kg/m ³ , seawater and oil are immiscible with each other, so the seawater and oil in the groove will Layering occurs, seawater and oil fill the second and first grooves respectively; when in a horizontal rotation state, the schematic diagram of its structure is shown in Figure 6, the grooves are placed in the opposite direction, and the second groove is located in the Above the inside of the medium structure, the first groove is located below the inside of the medium structure, seawater and oil fill the first and second grooves respectively, and the relevant parameters in all the above diagrams are shown in Table 1.

The reflector of the absorber is an all-copper metal plate.

The invention of a broadband wave absorber based on the regulation of gravity field, considering that there are certain technical difficulties in the actual production, the 3D printing method will be used in the actual production.

Table 1 Related parameters of the absorber

parameter a b c d e The value of the parameter (mm) twenty four 13.99 10.01 4 7 parameter f g h i j The value of the parameter (mm) 9 10 6 0.5 0.5 parameter k l m n p The value of the parameter (mm) 0.5 0.1 9.5 12 6.04

According to the invention, a broadband wave absorber controlled by a gravitational field can be replaced with other types of liquids such as mercury and alcohol in the medium structure.

As shown in Figure 7, it is the absorption curve of the absorber in two working states. Since the absorber is polarization sensitive to the incident electromagnetic wave, the absorption curves of the following two states are the absorption obtained in the TM mode. Curve, the electromagnetic wave is incident from the -z direction during operation. According to the absorptivity formula A(ω)=1-R(ω)-T(ω), R(ω) represents the reflectance, and T(ω) represents the transmittance. Since the bottom layer is a complete metal reflector, T(ω) =0, so A(ω)=1-R(ω). Figure 7 is the absorption curve when the absorber is not rotated and horizontally rotated. When the absorber is not rotated, the reflectivity in the frequency band 8.12 to 10.84GHz is lower than -10dB, and the absorption rate is higher than 90%. The absorption peaks at the 6.52GHz and 8.16GHz absorption frequency points are 99.96% and 93.54%, respectively; when the absorber is rotated horizontally, the reflectance in the frequency band 6.5 to 8.18GHz is lower than -10dB, and the absorption rate is higher than 90 %, the absorption peaks at the two absorption frequency points 6.67GHz and 7.75GHz are 94.06% and 94.35%, respectively, achieving broadband absorption. So we can adjust the absorption frequency domain by rotating the absorber.

After a specific design (groove shape design), the operating frequency of the present invention can be dynamically adjusted. The main absorption is caused by the glass structure and the internal liquid, and the regulation of the absorption frequency band is realized by a relatively ingenious means.

The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned specific embodiments. The above-mentioned specific embodiments and descriptions in the specification are only to further illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention There are also various changes and modifications which fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the claims and their equivalents.

Claims (7)

1. A broadband wave absorber based on gravitational field regulation and control, comprising a bottom metal reflector, and the bottom metal reflector is provided with a medium structure, and the inside of the medium structure has first and second places for placing seawater and oil. grooves, and there is a connecting part between the first and second grooves, and it is characterized in that: the medium structure is composed of a U-shaped pipe structure placed on a cuboid structure in reverse, and an arc is opened on the top of the cuboid structure along the center line. By rotating the absorber, under the action of the gravitational field, the position of the seawater and the oil is changed to achieve the purpose of frequency regulation; the absorber realizes the dynamic regulation of broadband absorption by means of medium resonance, When the absorber is not rotated, the second groove is located below the inside of the dielectric structure, the first groove is located above the interior of the dielectric structure, the absorption frequency band is 8.12 to 10.84 GHz, the reflectivity is lower than -10dB, and the absorption rate is higher than 90 %; When the wave absorber rotates horizontally, the second groove is located above the inside of the dielectric structure, the first groove is located below the interior of the dielectric structure, the absorption frequency band is 6.5 to 8.18 GHz, the reflectivity is lower than -10dB, and the absorption rate is high at 90%, thus achieving broadband absorption. 2. A kind of broadband wave absorber based on the regulation of gravity field according to claim 1, is characterized in that, described medium structure is " U " shape body by the first groove, is located inside " U " shape pipeline structure, its Oil is placed inside; the second groove is a right-angled "U" shape, located inside the cuboid structure, and seawater is placed inside. 3 . The broadband wave absorber based on gravitational field regulation according to claim 2 , wherein the volumes of the first groove and the second groove are equal. 4 . 4. a kind of broadband wave absorber based on gravitational field regulation according to claim 2, is characterized in that, described wave absorber has non-rotation and horizontal rotation state: When the wave absorber is not rotating, the second groove is located below the interior of the dielectric structure, and the first groove is located above the interior of the dielectric structure. Under the action of the gravitational field, the second groove is filled with seawater, and the first groove is filled with seawater. filled with oil; When the wave absorber rotates horizontally, the second groove is located above the interior of the dielectric structure, and the first groove is located below the interior of the dielectric structure. Under the action of the gravitational field, the second groove is filled with oil, and the first groove is filled with oil. Filled with sea water. 5. a kind of broadband wave absorber based on gravity field regulation according to claim 2, is characterized in that, described " U " shape pipeline structure outer diameter is 7 mm, inner diameter is 6 mm, length is 24 mm, wide is 14 mm; the cuboid structure of the excavated part is 24 mm long and 10 mm wide; the excavated part is a semi-cylinder with a radius of 2 mm; the inner groove is composed of two 6 mm long and 5.5 mm wide , consisting of a cuboid with a height of 9.5 mm and a cuboid with a length of 6 mm, a width of 3.46 mm and a height of 12 mm; the upper part of the cuboid has two cuboids with a radius of 7 mm cut out, with a length of 10 mm and a width of 10 mm. is 7 mm and the thickness is 0.01 mm. 6 . The broadband wave absorber based on gravitational field regulation according to claim 1 , wherein the material of the dielectric structure is glass. 7 . 7 . The broadband wave absorber based on gravitational field regulation according to claim 1 , wherein the material of the metal reflector is copper. 8 .

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