CN113381201B - Broadband wave-absorbing structure with frequency selectivity transmission function - Google Patents
Broadband wave-absorbing structure with frequency selectivity transmission function Download PDFInfo
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- CN113381201B CN113381201B CN202110555879.6A CN202110555879A CN113381201B CN 113381201 B CN113381201 B CN 113381201B CN 202110555879 A CN202110555879 A CN 202110555879A CN 113381201 B CN113381201 B CN 113381201B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
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Abstract
The invention discloses a broadband wave-absorbing structure with a frequency selective transmission function, which comprises a first wave-absorbing material block, a second wave-absorbing material block, a metal reflecting plate and a rectangular waveguide, wherein the first wave-absorbing material block and the second wave-absorbing material block are arranged on the upper end surface of the rectangular waveguide in a left-right parallel mode, the metal reflecting plate is positioned on the right side of the second wave-absorbing material block, the transmission frequency of the rectangular waveguide is determined by adjusting the size of the rectangular waveguide, electromagnetic waves outside the transmission frequency band of the rectangular waveguide are emitted out through the metal reflecting plate, and the wave-absorbing frequency bands of the first wave-absorbing material block and the second wave-absorbing material block are within the electromagnetic wave frequency band reflected by the metal reflecting plate; the advantage is that thickness is little, simple structure, and the cost is lower can use on a large scale.
Description
Technical Field
The invention relates to a broadband wave-absorbing structure, in particular to a broadband wave-absorbing structure with a frequency selective transmission function.
Background
Modern warfare places extremely high demands on the stealth performance of aircraft. The microwave stealth performance of a device is generally measured by the size of a Radar Cross Section (RCS). At present, the RCS of an equipment carrier can be reduced through conventional means such as appearance stealth and wave-absorbing coating, and microwave stealth is realized, so that an antenna system becomes one of scattering sources which contribute most to the whole RCS. For an antenna system, if a wave-absorbing coating or a stealth mode for changing the shape of the wave-absorbing coating is simply adopted, the radiation performance of the antenna is seriously influenced, so that the normal receiving and transmitting of radar waves of the antenna system are difficult to ensure. Therefore, a novel stealth radome structure must be designed, which can not only absorb enemy radar waves to reduce RCS, but also transmit electromagnetic waves within the operating frequency band of the own radar to achieve communication.
The traditional wave-absorbing material only has a wave-absorbing function, and can not transmit corresponding frequency band signals to achieve the purpose of communication while absorbing electromagnetic waves of an enemy. The improved wave-absorbing structure with the frequency selective transmission function can absorb radar waves of enemy and transmit corresponding frequency band signals, so that the normal operation of communication of our party is ensured. Yufeng Yu in the paper 3-D Frequency-Selective resonator Based on Magnetic Material and transmitter Line, a three-dimensional Frequency Selective transmission structure is proposed, which takes a wave-absorbing Material as an absorption channel and takes a parallel plate waveguide as a transmission channel, but the thickness of the structure is limited by one quarter of the transmission wavelength, and the ultra-thin wave-absorbing structure with Frequency Selective transmission cannot be realized. Yihao Wang proposed an ultra-thin Frequency Selective absorber structure in the paper Ultrathin 3-D Frequency Selective resonator With Wide Absorption Bands, the thickness of which is only one tenth of the transmission wavelength, but the Absorption part of which is composed of a wave-absorbing material and a lumped element, and the transmission channel adopts a section of complex slow-wave structure to realize lower insertion loss, so the structure is too complex and the application range of the structure is greatly limited.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a broadband wave-absorbing structure with frequency selective transmission function, which has the advantages of thin integral thickness, simple structure and low cost, and is suitable for large-scale use.
The technical scheme adopted by the invention for solving the technical problems is as follows: a broadband wave-absorbing structure with a frequency selective transmission function comprises a first wave-absorbing material block, a second wave-absorbing material block, a metal reflecting plate and a rectangular waveguide, wherein the first wave-absorbing material block, the second wave-absorbing material block and the metal reflecting plate are rectangular, the first wave-absorbing material block and the second wave-absorbing material block are arranged on the upper end surface of the rectangular waveguide in a left-right parallel mode, the left end surface of the first wave-absorbing material block is flush with the left end surface of the rectangular waveguide, the right end surface of the second wave-absorbing material block is flush with the right end surface of the rectangular waveguide, the right end surface of the first wave-absorbing material block is connected with the left end surface of the second wave-absorbing material block and is in a joint state, and the lower end surface of the first wave-absorbing material block and the lower end surface of the second wave-absorbing material block are respectively connected with the upper end surface of the rectangular waveguide and are in a joint state, the front end face of the first wave absorbing material block, the front end face of the second wave absorbing material block and the front end face of the rectangular waveguide are flush, the rear end face of the first wave absorbing material block, the rear end face of the second wave absorbing material block and the rear end face of the rectangular waveguide are flush, the metal reflecting plate is positioned on the right side of the second wave absorbing material block, the left end face of the metal reflecting plate is connected with the right end face of the second wave absorbing material block and is in a fit state, the front end face of the metal reflecting plate is flush with the front end face of the second wave absorbing material block, the rear end face of the metal reflecting plate is flush with the rear end face of the second wave absorbing material block, and the lower end faces of the metal reflecting plate, the first wave absorbing material block and the second wave absorbing material block are flush; the transmission frequency of the rectangular waveguide is determined by adjusting the size of the rectangular waveguide, electromagnetic waves outside the transmission frequency band of the rectangular waveguide are emitted out through the metal reflecting plate, and the wave absorbing frequency bands of the first wave absorbing material block and the second wave absorbing material block are within the frequency band of the electromagnetic waves reflected by the metal reflecting plate.
The first wave absorbing material block and the second wave absorbing material block are respectively realized by LCXJXB-10 type rubber-based wave absorbing material.
Rectangular waveguide be 6.3mm along the length of left and right directions, be 32mm along the length of fore-and-aft direction, be 4.5mm along the height of up-and-down direction, first wave absorption material piece be 2.6mm along the length of left and right directions, be 32mm along the length of fore-and-aft direction, be 8.5mm along the height of up-and-down direction, second wave absorption material piece be 3.7mm along the length of left and right directions, be 32mm along the length of fore-and-aft direction, be 8.5mm along the height of up-and-down direction, the metal reflecting plate be 0.018mm along the length of left and right directions, be 32mm along the length of fore-and-aft direction, be 8.5mm along the height of up-and-down direction.
Compared with the prior art, the invention has the advantages that the wave absorbing effect is enhanced by overlapping the first wave absorbing material and the second wave absorbing material, the electromagnetic wave can only penetrate through the rectangular waveguide channel through the combined structure of the metal reflecting plate and the rectangular waveguide, when the frequency of the incident electromagnetic wave is the same as the cut-off frequency of the rectangular waveguide, the electromagnetic wave is compressed into the rectangular waveguide to form perfect transmission, the transmission efficiency of the electromagnetic wave is greatly improved, in addition, the rectangular waveguide with any length can realize the perfect transmission function at the cut-off frequency, the whole thickness can not be limited by one fourth of the transmission wavelength and only depends on the thickness of the first wave absorbing material and the second wave absorbing material, the whole thickness is only one tenth of the transmission wavelength, the insertion loss of a transmission band is only 1dB, under the condition of ensuring the wave absorbing and transmitting effects, whole thickness is thinner, does not adopt any lumped element and complicated FSS structure, simple structure, and with low costs and processing convenience, transmission efficiency is high, and the reflectivity is low, and it is effectual to inhale the wave, is fit for using on a large scale, can be fine be applied to among stealthy antenna house's the practical application.
Drawings
FIG. 1 is a perspective view of a broadband wave-absorbing structure with frequency selective transmission function according to the present invention;
fig. 2 is an exploded view of a broadband wave-absorbing structure with frequency selective transmission function according to the present invention;
fig. 3 is a graph showing the absorption rate, reflection rate and transmission rate of the broadband wave-absorbing structure with frequency selective transmission function of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The embodiment is as follows: as shown in figures 1 and 2, the broadband wave-absorbing structure with the frequency selective transmission function comprises a first wave-absorbing material block 1, a second wave-absorbing material block 2, a metal reflector plate 4 and a rectangular waveguide 3, wherein the first wave-absorbing material block 1, the second wave-absorbing material block 2 and the metal reflector plate 4 are rectangular, the first wave-absorbing material block 1 and the second wave-absorbing material block 2 are arranged on the upper end surface of the rectangular waveguide 3 in a left-right parallel mode, the left end surface of the first wave-absorbing material block 1 is flush with the left end surface of the rectangular waveguide 3, the right end surface of the second wave-absorbing material block 2 is flush with the right end surface of the rectangular waveguide 3, the right end surface of the first wave-absorbing material block 1 is connected with the left end surface of the second wave-absorbing material block 2 in a joint state, the lower end surface of the first wave-absorbing material block 1 and the lower end surface of the second wave-absorbing material block 2 are respectively connected with the upper end surface of the rectangular waveguide 3 in a joint state, the front end face of the first wave-absorbing material block 1, the front end face of the second wave-absorbing material block 2 and the front end face of the rectangular waveguide 3 are flush, the rear end face of the first wave-absorbing material block 1, the rear end face of the second wave-absorbing material block 2 and the rear end face of the rectangular waveguide 3 are flush, the metal reflecting plate 4 is located on the right side of the second wave-absorbing material block 2, the left end face of the metal reflecting plate is connected with the right end face of the second wave-absorbing material block 2 and is in a joint state, the front end face of the metal reflecting plate is flush with the front end face of the second wave-absorbing material block 2, the rear end face of the metal reflecting plate is flush with the rear end face of the second wave-absorbing material block 2, and the lower end faces of the metal reflecting plate, the first wave-absorbing material block 1 and the second wave-absorbing material block 2 are flush; the transmission frequency of the rectangular waveguide 3 is determined by adjusting the size of the rectangular waveguide 3, electromagnetic waves outside the transmission frequency band of the rectangular waveguide 3 are emitted out through the metal reflecting plate 4, and the wave-absorbing frequency bands of the first wave-absorbing material block 1 and the second wave-absorbing material block 2 are within the electromagnetic wave frequency band reflected by the metal reflecting plate 4.
In this embodiment, the first wave-absorbing material block 1 and the second wave-absorbing material block 2 are respectively implemented by LCXJXB-10 type rubber-based wave-absorbing material.
In this embodiment, the length of the rectangular waveguide 3 in the left-right direction is 6.3mm, the length in the front-back direction is 32mm, the height in the up-down direction is 4.5mm, the length of the first wave-absorbing material block 1 in the left-right direction is 2.6mm, the length in the front-back direction is 32mm, the height in the up-down direction is 8.5mm, the length of the second wave-absorbing material block 2 in the left-right direction is 3.7mm, the length in the front-back direction is 32mm, the height in the up-down direction is 8.5mm, the length of the metal reflector plate 4 in the left-right direction is 0.018mm, the length in the front-back direction is 32mm, and the height in the up-down direction is 8.5 mm.
The simulation software CST is used to simulate the broadband wave-absorbing structure with frequency selective transmission function of this embodiment, and a simulation chart of the absorption rate, the reflection rate and the transmission rate under the normal incidence of the electromagnetic wave is shown in fig. 3. Analysis of FIG. 3 reveals that: the broadband wave-absorbing structure with the frequency selective transmission function has the advantages that the reflectivity is basically kept below 0.1, the reflectivity is low, the transmission rate reaches 0.8 when being 5.25GHz, the transmission efficiency is high, the absorption rate is kept above 0.8 when being 2-3.2 GHz and 8.5-11 GHz, and the wave-absorbing effect is good.
Claims (3)
1. A broadband wave-absorbing structure with a frequency selective transmission function is characterized by comprising a first wave-absorbing material block, a second wave-absorbing material block, a metal reflecting plate and a rectangular waveguide, wherein the first wave-absorbing material block, the second wave-absorbing material block and the metal reflecting plate are rectangular, the first wave-absorbing material block and the second wave-absorbing material block are arranged on the upper end surface of the rectangular waveguide in a left-right parallel mode, the left end surface of the first wave-absorbing material block is flush with the left end surface of the rectangular waveguide, the right end surface of the second wave-absorbing material block is flush with the right end surface of the rectangular waveguide, the right end surface of the first wave-absorbing material block is connected with the left end surface of the second wave-absorbing material block and is in a joint state, the lower end surface of the first wave-absorbing material block and the lower end surface of the second wave-absorbing material block are respectively connected with the upper end surface of the rectangular waveguide and are in a joint state, the front end face of the first wave absorbing material block, the front end face of the second wave absorbing material block and the front end face of the rectangular waveguide are flush, the rear end face of the first wave absorbing material block, the rear end face of the second wave absorbing material block and the rear end face of the rectangular waveguide are flush, the metal reflecting plate is positioned on the right side of the second wave absorbing material block, the left end face of the metal reflecting plate is connected with the right end face of the second wave absorbing material block and is in a fit state, the front end face of the metal reflecting plate is flush with the front end face of the second wave absorbing material block, the rear end face of the metal reflecting plate is flush with the rear end face of the second wave absorbing material block, and the lower end faces of the metal reflecting plate, the first wave absorbing material block and the second wave absorbing material block are flush; the transmission frequency of the rectangular waveguide is determined by adjusting the size of the rectangular waveguide, electromagnetic waves outside the transmission frequency band of the rectangular waveguide are emitted out through the metal reflecting plate, and the wave absorbing frequency bands of the first wave absorbing material block and the second wave absorbing material block are within the frequency band of the electromagnetic waves reflected by the metal reflecting plate.
2. The broadband wave-absorbing structure with the frequency selective transmission function of claim 1, wherein the first wave-absorbing material block and the second wave-absorbing material block are respectively implemented by LCXJXB-10 type rubber-based wave-absorbing material.
3. The broadband wave-absorbing structure with the frequency selective transmission function according to claim 1, wherein the rectangular waveguide has a length of 6.3mm in a left-right direction, a length of 32mm in a front-back direction, and a height of 4.5mm in a top-bottom direction, the first wave-absorbing material block has a length of 2.6mm in a left-right direction, a length of 32mm in a front-back direction, and a height of 8.5mm in a top-bottom direction, the second wave-absorbing material block has a length of 3.7mm in a left-right direction, a length of 32mm in a front-back direction, and a height of 8.5mm in a top-bottom direction, the metal reflector has a length of 0.018mm in a left-right direction, a length of 32mm in a front-back direction, and a height of 8.5mm in a top-bottom direction.
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