CN111293441A - Wave absorbing and transmitting integrated wave absorber - Google Patents
Wave absorbing and transmitting integrated wave absorber Download PDFInfo
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- CN111293441A CN111293441A CN202010097433.9A CN202010097433A CN111293441A CN 111293441 A CN111293441 A CN 111293441A CN 202010097433 A CN202010097433 A CN 202010097433A CN 111293441 A CN111293441 A CN 111293441A
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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
- H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
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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
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/0026—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective said selective devices having a stacked geometry or having multiple layers
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- Aerials With Secondary Devices (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a wave absorption and transmission integrated wave absorber which comprises a wave absorption layer on the upper layer, a wave transmission layer on the lower layer and an air layer between the two layers, wherein the wave absorption layer is used for absorbing electromagnetic waves of a high-frequency part, the wave transmission layer is used for transmitting the electromagnetic waves of a low-frequency part, and the air layer is used for connecting the wave absorption layer and the wave transmission layer, so that the wave absorption and transmission integrated wave absorber has a wider wave transmission band under the condition that the wave absorption band is wider. Compared with the common wave absorption and transmission integrated structure, the antenna has the advantages that the antenna has a wider wave transmission band under the condition that the wave absorption band is wider, and the thickness is thinner, so that the antenna can be better applied to an antenna cover, and the effects of in-band wave transmission and out-of-band stealth are realized.
Description
Technical Field
The invention relates to electromagnetic field and microwave technology, in particular to a wave absorption and transmission integrated wave absorber.
Background
The antenna cover is a protective cover which is arranged outside radar antennas of various weapons and airplanes and used for protecting the antennas from being influenced by various external factors, and is also a wave-transparent window for transmitting and receiving electromagnetic signals of various weapon radar antennas. With the continuous development of the electronic countermeasure technology, people increasingly research the antenna housing, and the requirements on the functions of the antenna housing are higher and higher. The stealth technology antenna cover is mainly used for reducing radar scattering cross sections (RCS) of various weapon aircraft radar antennas. The invisible antenna housing is mainly divided into two types, one is made of radar wave-absorbing materials, and the other is the antenna housing loaded with FSS.
Although radar wave-absorbing materials are an effective way for reducing RCS, most of the materials are placed on a loss layer, and the thickness of the materials is thicker, so that the stealth technology is not facilitated, and therefore, research on the antenna housing loaded with the FSS becomes a hotspot. The research on the antenna housing loaded with the FSS is started in the United states at the earliest, researchers designed the first FSS stealth antenna housing in 1974, and then continuously improved, and the antenna housing loaded with the FSS is applied to an F-22 fighter in 2002, so that good results are obtained, and the stealth capability and the anti-interference capability of an airplane are greatly improved. Although the beginning of China is late, with the gradual improvement of the economic strength of China, domestic scholars begin to research stealth radomes more and more. Like the United states, most domestic stealth radomes are realized by loading FSS, and although loading on weaponry can be realized independently at present, certain gap exists between the stealth radomes and foreign countries.
Although the currently researched loaded FSS antenna housing can realize stealth, the requirements of the antenna on out-of-band stealth and in-band wave-transmitting cannot be met.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides an integrated wave absorber for absorbing and transmitting waves, which can effectively solve the current situations of narrow transmission band and thick thickness of the traditional FSS wave absorbing radome. The method provides important technical support for the fields of electromagnetic stealth, electromagnetic compatibility and radar wave absorption, and has important military and civil values.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an inhale ripples integration wave absorber that passes through, includes the layer of absorbing the ripples on upper strata, the layer of passing through the ripples of lower floor and the air bed between these two-layer, wherein the layer of absorbing the ripples is used for absorbing the electromagnetic wave of high frequency part, passes through the ripples layer and is used for transmitting the electromagnetic wave of low frequency part, and the air bed is used for linking up the layer of absorbing the ripples and passes through the ripples layer and make it become an overall structure to make the integration wave absorber that absorbs the ripples of passing through have the wave band of passing through than wide under the circumstances of absorbing the wave band width.
Optionally, the wave-absorbing layer includes a first dielectric substrate and a resistor square ring structure loaded on the upper surface of the first dielectric substrate.
Preferably, the resistor square ring structure is a metal square ring with four sides loaded with a resistor respectively. The electromagnetic waves are lost through the loss of the resistor, so that the wave absorbing effect is achieved.
Preferably, the first dielectric substrate is a medium FR4 with a dielectric constant of 4.3 and a dielectric layer thickness h of FR41＝1.31mm。
Optionally, the wave-transparent layer includes a second dielectric substrate, a third dielectric substrate, a first FSS layer, a second FSS layer, and a third FSS layer, and the first FSS layer is loaded on the upper surface of the second dielectric substrate, the second FSS layer is loaded between the second and third dielectric substrates, and the third FSS layer is loaded on the lower surface of the third dielectric substrate.
Preferably, first FSS layer and third FSS layer structure are the same, including four first metal square rings, and four first metal square rings are located four angles of square structure respectively, and square ring simple structure makes the comparison convenient, and the wave-transparent effect that reaches simultaneously is better, and second FSS layer includes a second metal square ring. The wave-transparent effect is optimized by combining the square ring structures of the first and third layers of FSS.
Preferably, the second dielectric substrate and the third dielectric substrate are dielectric teflon, the dielectric constant of the dielectric substrate is 2.2, and the thickness h of the dielectric layer of the teflon2＝0.25mm。
Has the advantages that: compared with the prior art, the invention has the advantages that:
(1) compared with the common structure, the wave absorption and transmission integrated wave absorber has better polarization stability and angle stability by adopting a central symmetrical structure.
(2) The wave absorbing layer and the wave transmitting layer are adopted, and the wave absorbing and transmitting integrated wave absorber has a wider wave transmitting band under the condition that the wave absorbing frequency band is wider through the connection of the air layer, so that the defects of the traditional wave absorbing and transmitting integrated wave absorber are effectively overcome.
Drawings
FIG. 1 is a side view of an integrated wave absorber structure for absorbing and transmitting waves;
FIG. 2 is a schematic structural diagram of the upper layer and the lower layer of the wave-absorbing and wave-transmitting integrated wave absorber, wherein (a) is a schematic structural diagram of a resistance square ring of a wave-absorbing layer, (b) is a schematic structural diagram of a first FSS layer and a third FSS layer of a wave-transmitting layer, and (c) is a schematic structural diagram of a second FSS layer of the wave-transmitting layer;
fig. 3 is a curve diagram of reflection coefficient and transmission coefficient of the wave absorption and transmission integrated wave absorber.
Detailed Description
In order to clearly and clearly illustrate the objects, technical solutions and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention aims to design an integrated wave absorber with an outer stealth function and an inner wave-transmitting and wave-absorbing function. The wave-absorbing layer mainly comprises four FSS layers, three dielectric layers and an air layer, the upper wave-absorbing layer comprises 1 FSS layer and one dielectric layer and is mainly used for absorbing waves, the lower wave-transmitting layer comprises three FSS layers and two dielectric layers and is mainly used for transmitting waves, and the upper layer and the lower layer are mainly cascaded by the middle air layer. The wave absorber consists of an upper wave absorbing layer, a lower wave transmitting layer and an air layer between the upper wave absorbing layer and the lower wave transmitting layer, wherein the wave absorbing layer consists of a medium substrate and a square ring loaded with four resistors, and the wave transmitting layer consists of two medium substrates and three FSS layers. The working principle of the wave absorption and transmission integrated wave absorber is as follows: the wave absorbing layer of the upper layer which is responsible for absorbing waves in the high-frequency part and the wave transmitting layer of the lower layer which is transparent to waves in the low-frequency part work simultaneously, and finally the wave absorbing and transmitting integrated wave absorber which absorbs waves in the low-frequency transparent waves and the high-frequency waves is obtained. The wave absorption and transmission integrated wave absorber has a 4.39 GHz-wide wave transmission band within 6.18-10.57GHz and a 4.07 GHz-wide wave absorption band within 13.12-17.19 GHz. The total thickness of the wave absorption and transmission integrated wave absorber is 7.87mm, wherein the upper dielectric layer is 0.25mm, the lower dielectric layers are 1.31mm, and the air layer is 5 mm. Compared with the common wave absorption and transmission integrated wave absorber, the wave absorption and transmission integrated wave absorber has a wider wave transmission band under the condition of wider wave absorption frequency band, and is thinner, so that the wave absorption and transmission integrated wave absorber can be better applied to an antenna cover, and the effects of in-band wave transmission and out-of-band stealth are realized. Specifically, the method comprises the following steps:
as shown in fig. 1, the wave absorption and transmission integrated wave absorber of the embodiment of the present invention includes a wave absorption layer 1 on an upper layer, a wave transmission layer 2 on a lower layer, and an air layer 3 between the two layers, wherein the wave absorption layer is used for absorbing electromagnetic waves of a high frequency part, the wave transmission layer is used for transmitting electromagnetic waves of a low frequency part, and the air layer is used for connecting the wave absorption layer and the wave transmission layer to form an integral structure, so that the wave absorption and transmission integrated wave absorber has a relatively wide wave transmission band under the condition of a relatively wide wave absorption band, and the defects of the conventional wave absorption and transmission integrated wave absorber are effectively overcome.
The wave absorbing layer comprises a first medium substrate 11 and a resistor square ring structure 12 loaded on the upper surface of the first medium substrate, the wave transmitting layer comprises a second medium substrate 21, a third medium substrate 22, a first FSS layer 23, a second FSS layer 24 and a third FSS layer 25, the first FSS layer is loaded on the upper surface of the second medium substrate, the second FSS layer is loaded between the second medium substrate and the third medium substrate, and the third FSS layer is loaded on the lower surface of the third medium substrate. The first dielectric substrate has a thickness h1The thickness of the second dielectric substrate and the third dielectric substrate is h2The air layer thickness is t.
As shown in FIG. 2(a), the resistor square ring structure is a metal square ring with a resistor 13 loaded on each of four sides, and the outer side length d of the metal square ring15.5mm, the width of the metal square ring is W1Wherein p is the side length of the dielectric substrate, and p is 10 mm. The first dielectric substrate is a medium FR4 with a dielectric constant of 4.3 and a dielectric layer thickness h of FR41＝1.31mm。
As shown in fig. 2(b) - (c), the first FSS layer and the third FSS layer have the same structure, and include four first metal square rings 201, where the four first metal square rings are respectively located at four corners of the square structure, and the outer side length d of the first metal square ring is23.34mm, width w of the first metal square ring2＝0.21mm；The second FSS layer includes a second metal square ring 202 having an outer edge length d39.75mm, the width of the second metal square ring is also w20.21 mm; the second dielectric substrate and the third dielectric substrate are dielectric Teflon, the dielectric constant of the dielectric Teflon is 2.2, and the thickness h of the dielectric layer of the Teflon is equal to that of the dielectric layer2＝0.25mm。
The thickness of the air layer is t-5 mm.
As shown in fig. 1 and fig. 2, the wave absorption and transmission integrated wave absorber structure of the embodiment of the invention is a centrosymmetric structure, and compared with a common structure, the wave absorption and transmission integrated wave absorber structure has better polarization stability and angle stability.
The wave absorbing and transmitting integrated wave absorber adopts the wave absorbing layer and the wave transmitting layer, and the air layer is connected, so that the wave absorbing and transmitting integrated wave absorber has a wider wave transmitting band under the condition of wider wave absorbing band, and the defects of the traditional wave absorbing and transmitting integrated wave absorber are effectively overcome.
According to the working frequency band of the wave absorption and transmission integrated wave absorber, the material of the dielectric substrate can be selected from FR4, Teflon and the like, the metal structure material can be selected from metals with good conductivity and stable property, such as copper, gold, aluminum and the like, and the resistor can be selected from common resistors.
FIG. 3 shows a simulation result diagram of wave absorption rate of the wave absorption and transmission integrated wave absorber. As can be seen from the figure, the wave absorption and transmission integrated wave absorber has a 4.39 GHz-wide wave transmission band within 6.18-10.57GHz and a 4.07 GHz-wide wave absorption band within 13.12-17.19 GHz.
Claims (7)
1. The utility model provides a inhale wave transmission integration wave absorber which characterized in that: the wave absorbing layer comprises a wave absorbing layer (1) on the upper layer, a wave transmitting layer (2) on the lower layer and an air layer (3) between the two layers, wherein the wave absorbing layer is used for absorbing the electromagnetic wave of the high-frequency part, the wave transmitting layer is used for transmitting the electromagnetic wave of the low-frequency part, and the air layer is used for connecting the wave absorbing layer and the wave transmitting layer, so that the wave absorbing and transmitting integrated wave absorber has a wider wave transmitting band under the condition that the wave absorbing band is wider.
2. The wave absorption and transmission integrated wave absorber according to claim 1, characterized in that: the wave absorbing layer comprises a first medium substrate (11) and a resistance square ring structure (12) loaded on the upper surface of the first medium substrate.
3. The wave absorption and transmission integrated wave absorber according to claim 2, wherein: the resistor square ring structure is a metal square ring with four edges loaded with a resistor (13) respectively.
4. The wave absorption and transmission integrated wave absorber according to claim 2, wherein: the first dielectric substrate is a medium FR4 with a dielectric constant of 4.3 and a dielectric layer thickness h of FR41＝1.31mm。
5. The wave absorption and transmission integrated wave absorber according to claim 1, characterized in that: the wave-transparent layer comprises a second dielectric substrate (21), a third dielectric substrate (22), a first FSS layer (23), a second FSS layer (24) and a third FSS layer (25), wherein the first FSS layer is loaded on the upper surface of the second dielectric substrate, the second FSS layer is loaded between the second dielectric substrate and the third dielectric substrate, and the third FSS layer is loaded on the lower surface of the third dielectric substrate.
6. The wave absorption and transmission integrated wave absorber according to claim 5, wherein: the first FSS layer and the third FSS layer are identical in structure and comprise four first metal square rings (201), the four first metal square rings are respectively located at four corners of the square structure, and the second FSS layer comprises a second metal square ring (202).
7. The wave absorption and transmission integrated wave absorber according to claim 5, wherein: the second dielectric substrate and the third dielectric substrate are dielectric Teflon, the dielectric constant of the dielectric Teflon is 2.2, and the thickness h of the dielectric layer of the Teflon is equal to that of the dielectric layer2＝0.25mm。
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| CN202010097433.9A CN111293441B (en) | 2020-02-17 | 2020-02-17 | Wave absorbing and transmitting integrated wave absorber |
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| CN202010097433.9A CN111293441B (en) | 2020-02-17 | 2020-02-17 | Wave absorbing and transmitting integrated wave absorber |
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Cited By (2)
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| CN111725626A (en) * | 2020-07-08 | 2020-09-29 | 南京航空航天大学 | Antenna housing capable of realizing asymmetric transmission and energy isolation of electromagnetic waves through absorption and reconstruction |
| CN113314850A (en) * | 2021-05-08 | 2021-08-27 | 南京邮电大学 | 2.5D multilayer frequency selective surface |
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