CN213845523U

CN213845523U - Frequency selection structure with double-frequency broadband wave absorbing characteristic

Info

Publication number: CN213845523U
Application number: CN202022570563.8U
Authority: CN
Inventors: 马长春; 孔芳玲
Original assignee: Hangzhou Yongxie Technology Co ltd
Current assignee: Fulida Technology (Hangzhou) Co., Ltd
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2021-07-30
Anticipated expiration: 2030-11-09

Abstract

The utility model relates to the technical field of electromagnetism, and discloses a frequency selection structure with double-frequency broadband wave-absorbing characteristics, which has the key points of the technical scheme that the frequency selection structure comprises two plates which are arranged in parallel, wherein a cushion material is filled between the plates, one plate surface is covered with a copper-coated block, the other plate surface is provided with a plurality of wave-absorbing parts, and the wave-absorbing parts are arranged in an array manner and comprise a plurality of absorbing parts; the absorption portion includes a plurality of first wires, a plurality of second wire and integrated resistance, and first wire and second wire are mutual end to end connection in proper order to make the closed return circuit of formation, the utility model discloses can adjust the whole area of selecting the structure frequently according to the difference of required ripples frequency channel of inhaling, the portion of inhaling includes a plurality of absorption portions, the absorption portion is used for absorbing the electromagnetic wave of reflection to solved the this problem that is difficult to realize that the multifrequency is inhaled in the background art and mentioned, also need not set up very thick absorbing material and absorb the electromagnetic wave simultaneously.

Description

Frequency selection structure with double-frequency broadband wave absorbing characteristic

Technical Field

The utility model relates to an electromagnetism technical field, more specifically the structure is selected frequently that relates to a wave-absorbing characteristic is inhaled to double-frequency broadband that says so.

Background

The conventional structural wave-absorbing material realizes a cancellation effect by utilizing the phase difference between incident waves and reflected waves of electromagnetic waves in the material, so that the reflection is minimized, and the wave-absorbing effect is achieved by combining the loss of the material, wherein FR-4 is one of the most common materials, and FR-4 is a glass fiber epoxy resin copper-clad plate or a base material in a circuit board. Therefore, the conventional wave-absorbing material is generally large in thickness and narrow in wave-absorbing frequency band, and the multi-frequency wave-absorbing effect is more difficult to realize.

In real life, the electromagnetic wave is often multi-frequency electromagnetic wave, so the effect of the existing wave-absorbing material is often unsatisfactory.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a frequently select structure with wave-absorbing characteristic of dual-frenquency broadband for overcome the above-mentioned defect among the prior art.

In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a frequently select structure with wave-absorbing characteristic of dual-frenquency broadband, includes two parallel arrangement's panel, it has the pad material to fill between the panel, the pad material plays the supporting role, one of them panel surface covering has the copper covering piece, the setting of copper covering piece can reflect the electromagnetic wave, should cover the copper and be equivalent to the short circuit line, another panel is provided with a plurality of wave-absorbing part on the surface, wave-absorbing part array sets up, can adjust the length of the first second wire of each absorption part according to the requirement of required absorption frequency channel, adjusts the area of whole frequently selecting the structure. The wave absorbing part comprises a plurality of absorbing parts, and the absorbing parts are used for absorbing the reflected electromagnetic waves;

the absorption part comprises a plurality of first wires, a plurality of second wires and an integrated resistor, the first wires and the second wires are sequentially connected end to form a closed loop, the integrated resistor is arranged at the joint of the first wires and the second wires, an rlc circuit is equivalently arranged through the arrangement of the first wires, the second wires and the integrated resistor, and the electromagnetic waves with different frequencies are absorbed by utilizing that the length of the first wires, the length of the second wires and the first wires are respectively equal to half-wavelength of electromagnetic waves with different required frequencies and the integrated resistor.

The length of the first conducting wire and the length of the second conducting wire in the different closed loops are different, so that the closed loops with different line lengths are formed, and the electromagnetic waves with different frequencies can be absorbed through the arrangement of the first conducting wire and the second conducting wire with different lengths, so that the problem that multi-frequency wave absorption is difficult to realize in the background technology is solved, and meanwhile, a very thick wave absorbing material is not required to be arranged to absorb the electromagnetic waves.

As a further improvement of the present invention, the circuit is long the closed loop cover is installed on the circuit short the closed loop is provided with a plurality of absorption portions in the smallest area, thereby achieving the function of absorbing more electromagnetic waves with different frequencies.

As a further improvement of the utility model, the line length in the closed circuit absorption portion by four first wire, four the second wire and eight the integrated resistor is constituteed, the length of first wire is the same with the half wavelength of 8.7GHz electromagnetic wave, combines integrated resistor to the messenger forms first RLC circuit, two sections first wire and one section the total length of second wire is the same with the half wavelength of 4.7GHz electromagnetic wave, combines integrated resistor to the messenger forms the second RLC circuit.

As a further improvement of the present invention, the short circuit of the absorbing part in the closed loop is composed of four first wires, four second wires and eight integrated resistors, the short circuit of the closed loop of the absorbing part of the first wires is the same as the half wavelength of the 17.8GHz electromagnetic wave, and the integrated resistors are combined to form a third RLC circuit.

As a further improvement of the present invention, the shape of the closed loop includes a rectangle, a triangle, and a circle.

As a further improvement of the utility model, the material of the cushion material is foam or plastic, and the light hard material which is not easy to reflect electromagnetic waves, such as foam or plastic, can reduce the weight of the whole frequency selection structure and can provide enough supporting force.

As a further improvement of the utility model, the plates are FR-4 plates.

The utility model has the advantages that: the utility model discloses can adjust the whole area of selecting the structure frequently as required coverage area size's difference, the portion of absorbing wave includes a plurality of absorption portions, the absorption portion is used for absorbing the electromagnetic wave of reflection to solved this problem that is difficult to realize that multifrequency is ripples is inhaled among the background art and mentioned, also need not set up very thick absorbing material simultaneously and absorb the electromagnetic wave.

Drawings

Fig. 1 is a schematic front view of the present invention;

fig. 2 is a schematic view of the assembly structure of the present invention;

figure 3 is a side view of the present invention from figure 1;

fig. 4 is a graph of experimental data for the first embodiment in the specification.

Reference numerals: 1. a wave absorbing part; 2. a plate material; 3. a cushion material; 4. coating a copper block; 5. an absorbing part; 51. a first conductive line; 52. a second conductive line; 53. and integrating the resistor.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

Referring to fig. 1, 2 and 3, in the frequency selection structure with the dual-frequency broadband wave-absorbing characteristic of the embodiment, two plates 2 are arranged in parallel, a pad 3 is filled between the plates 2, a copper-clad block 4 covers the surface of one plate 2, a plurality of wave-absorbing parts 1 are arranged on the surface of the other plate 2, the wave-absorbing parts 1 are arranged in an array, and each wave-absorbing part 1 comprises a plurality of absorbing parts 5;

the absorption part 5 comprises a plurality of first wires 51, a plurality of second wires 52 and an integrated resistor 53, the first wires 51 and the second wires 52 are sequentially connected end to form a closed loop, the integrated resistor 53 is arranged at the connection position of the first wires 51 and the second wires 52, when electromagnetic waves irradiate into the wave absorption part 1, the copper-coated block 4 is equivalent to a short-circuit line, so that the vertically incident electromagnetic waves are all reflected to form a transmission zero point, the reflected electromagnetic waves resonate through the closed loop, and the energy of the electromagnetic waves with half wavelength equal to the length of the first wires 51 and the length of the second wires 52 plus the length of the first wires 51 is absorbed by the integrated resistor 53.

The lengths of the first conductive line 51 and the second conductive line 52 in different closed loops are different, so that the closed loops with different line lengths are formed.

Referring to fig. 1, a closed loop with a long line is sleeved outside a closed loop with a short line.

In the first embodiment, two groups of absorption parts 5 are covered on the surface of one layer of FR4 board 2, the absorption part 5 in the closed loop with the line length is composed of four first conducting wires 51, four second conducting wires 52 and eight integrated resistors 53, the length of the first conducting wire 51 is the same as the half wavelength of the 8.7GHz electromagnetic wave, the integrated resistor 53 is combined, the method is equivalent to serially connecting a first RLC circuit on the transmission line with the short circuit terminal, when in resonance, the energy is absorbed by the resistor R, so that an absorption section 1 is generated in the frequency band, and simultaneously the total length of the two first conducting wires 51 and the second conducting wire 52 is equivalent to the half wavelength of the 4.7GHz electromagnetic wave, so that at the frequency point, the integrated resistor 53 is combined, the second RLC circuit connected in series is serially connected on the transmission line with the short circuit terminal, so as to form an absorption point 2, and thus a broadband absorption band of 3.2-9.5 GHz is formed;

similarly, the absorption part 5 in the closed loop with the short circuit consists of four first conducting wires 51, four second conducting wires 52 and eight integrated resistors 53, the length of the first conducting wire 51 in the absorption part 5 in the closed loop with the short circuit is the same as the half wavelength of the 17.8GHz electromagnetic wave, and a third RLC circuit which is connected in series on a transmission line which is equivalent to a terminal short circuit in combination with the integrated resistors 53, so that absorption points 3 are generated at the frequency point to form a high-frequency wave absorbing section 15.2-19.3 GHz. The three series RLC circuits are connected in parallel.

The length of the second conducting wire 52 in the absorbing part 5 with long circuit in the closed loop, the length of the second conducting wire 52 in the absorbing part 5 with short circuit in the closed loop, and the total length of the first conducting wire 51 plus the length of the second conducting wire 52 in the absorbing part 5 with short circuit in the closed loop are not easy to generate frequency points due to the length, and the following table is made for reference according to experimental data (see fig. 4):

therefore, the wave-absorbing rate simulation result of the wave-absorbing structure shows that the wave-absorbing rate is more than 85% and the relative bandwidth reaches 104.7% in a frequency band of 3-9.6 GHz, so that the broadband wave-absorbing performance of a low-frequency band is realized; the absorption rate is over 85% in the frequency band of 15.1-19.4 GHz, so that the wave-absorbing performance of a high-frequency band is realized;

for the electromagnetic waves with different polarization angles (Phi, 0/45/90) of vertical incidence, the wave-absorbing structure has the same wave-absorbing property, i.e. has no polarization property.

In a second embodiment, the shape of the closed loop includes rectangular, triangular, circular.

In the third embodiment, the material of the mat 3 is foam or plastic.

In the fourth embodiment, an FR-4 board is used as the board 2.

The working principle is as follows: when the electromagnetic wave irradiates into the wave absorbing part 1, the copper-clad block 4 is equivalent to a short-circuit line, so that the vertically incident electromagnetic wave is totally reflected to form a transmission zero point, the reflected electromagnetic wave resonates through the closed loop, and the energy of the electromagnetic wave with the half wavelength equal to the length of the first lead 51 and the length of the second lead 52 plus two sections of the first lead 51 is absorbed by the integrated resistor 53.

Through the arrangement of the multiple groups of absorption parts 5, the electromagnetic waves of different wave bands are absorbed by the combination of the lengths of the first conducting wire 51 and the second conducting wire 52 in the absorption parts 5, so that the electromagnetic waves of different wavelengths are absorbed. Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a structure is selected frequently with wave-absorbing characteristic of dual-frenquency broadband, includes two parallel arrangement's panel (2), it has pad material (3) to fill between panel (2), its characterized in that: the surface of one plate (2) is covered with a copper-coated block (4), the surface of the other plate (2) is provided with a plurality of wave-absorbing parts (1), the wave-absorbing parts (1) are arranged in an array, and each wave-absorbing part (1) comprises a plurality of absorbing parts (5);

the absorption part (5) comprises a plurality of first conducting wires (51), a plurality of second conducting wires (52) and an integrated resistor (53), wherein the first conducting wires (51) and the second conducting wires (52) are sequentially connected end to form a closed loop, and the integrated resistor (53) is arranged at the connecting position of the first conducting wires (51) and the second conducting wires (52);

the lengths of the first conducting wire (51) and the second conducting wire (52) in different closed loops are different, so that the closed loops with different line lengths are formed.

2. The frequency-selective structure with double-frequency broadband wave-absorbing property of claim 1, wherein: the closed loop with the long circuit is sleeved outside the closed loop with the short circuit.

3. The frequency-selective structure with double-frequency broadband wave-absorbing property of claim 2, wherein: the absorption part (5) in the closed loop with the line length is composed of four first leads (51), four second leads (52) and eight integrated resistors (53), the length of the first leads (51) is the same as the half wavelength of an 8.7GHz electromagnetic wave, the integrated resistors (53) are combined to form a first RLC circuit, the total length of two sections of the first leads (51) and one section of the second leads (52) is the same as the half wavelength of the 4.7GHz electromagnetic wave, and the integrated resistors (53) are combined to form a second RLC circuit.

4. The frequency-selective structure with double-frequency broadband wave-absorbing property according to claim 2 or 3, characterized in that: the absorption part (5) in the closed loop with the short circuit consists of four first wires (51), four second wires (52) and eight integrated resistors (53), the length of the first wires (51) in the absorption part (5) in the closed loop with the short circuit is the same as the half wavelength of the 17.8GHz electromagnetic wave, and the integrated resistors (53) are combined to form a third RLC circuit.

5. The frequency-selective structure with double-frequency broadband wave-absorbing property according to claim 1 or 2, characterized in that: the shape of the closed loop comprises a rectangle, a triangle and a circle.

6. The frequency-selective structure with double-frequency broadband wave-absorbing property of claim 1, wherein: the material of the cushion material (3) is foam or plastic.

7. The frequency-selective structure with double-frequency broadband wave-absorbing property of claim 1, wherein: the plate (2) is made of an FR-4 plate.