CN212848818U - Intelligent reconfigurable frequency selection radar wave absorber based on PIN (personal identification number) tube - Google Patents
Intelligent reconfigurable frequency selection radar wave absorber based on PIN (personal identification number) tube Download PDFInfo
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Abstract
The embodiment of the utility model discloses intelligence reconfigurable frequency selection radar wave absorber based on PIN pipe relates to electromagnetic compatibility technical field, can satisfy and realize asymmetric transmission and energy isolation respectively to normal communication small-signal and high energy electromagnetic wave. The utility model discloses a: the broadband polarization rotator is composed of a 3-layer structure including: the front layer and the rear layer are mutually vertical grating structures to form a Fabry-Perot cavity; the middle layer of the broadband polarization rotating body is an elliptic resonance structure inclined by 45 degrees; the switchable absorption-transmission FSR is also composed of a 3-layer structure comprising: the front and rear consumable layers with the same structure are spatially symmetrical with respect to the middle layer; the middle layer of the FSR with switchable absorption and permeation is a lossless layer; and a PIN tube, resistor and capacitor are embedded on each layer of the absorption-transmission switchable FSR. The utility model is suitable for an anti electromagnetic interference's asymmetric antenna house design.
Description
Technical Field
The utility model relates to an electromagnetic compatibility technical field especially relates to an intelligence reconfigurable frequency selection radar wave absorption body based on PIN pipe.
Background
In a complex electromagnetic environment, any electronic and electric product must ensure normal operation of itself in addition to bearing certain external electromagnetic interference. Generally, radiated interference occurs in the medium surrounding the product, and generally electromagnetic interference emitted through the housing, or interference intruding through the housing, is radiated interference. Conventional protective measures (such as radar absorbing material technology and the like) cannot be simply applied to antenna protection. In fact, it is a pair of contradictions that are difficult to solve in practice to require a radar antenna system to radiate only own radar waves and to suppress external electromagnetic interference signals, resulting in non-reciprocal electromagnetic wave transmission.
At present, no complete theory and system design method is formed for suppressing external interference signals under the condition of ensuring that the radiation performance of the antenna is unchanged or even improved. In practical engineering applications, many anti-interference protections require the use of non-reciprocal electromagnetic materials, such as: the material works with large-scale ferrite materials under the condition of static magnetic field bias, but the materials are difficult to apply to integrated microwave devices and work with antennas. In addition, the working frequency band of the active electronic information equipment is wider and wider, the sensitivity is stronger and stronger, and the integration level is higher and higher, so that higher requirements are provided for designing the anti-electromagnetic interference asymmetric antenna housing.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a frequency selective radar wave absorber is restructural to intelligence based on PIN pipe particularly, is the antenna house of designing one kind to incident electromagnetic wave energy sensitivity. The self-adaptive switching can be realized by utilizing the sensitivity of the PIN tube to the field intensity, and the requirements of realizing asymmetric transmission and energy isolation of small signals and high-energy electromagnetic waves are met.
In order to achieve the above object, the embodiments of the present invention adopt the following technical solutions:
the intelligent reconfigurable frequency selective radar wave absorber is a composite structure, and the composite structure comprises two parts: a broadband polarization rotator (1) and a switchable FSR (2) of absorption and transmission.
The broadband polarization rotator (1) is composed of a 3-layer structure including: the front layer and the rear layer are mutually vertical grating structures to form a Fabry-Perot cavity, so that the bandwidth can be expanded. The middle layer of the broadband polarization rotator (1) is an elliptic resonance structure inclined by 45 degrees, and the polarization rotation function is realized.
The switchable absorption-transmission FSR (2) is also composed of a 3-layer structure, comprising: the front and back layers with the same structure are symmetrical with respect to the middle layer space, so that the transmission characteristics of electromagnetic waves transmitted in the forward direction and the reverse direction are the same. The intermediate layer of the absorption-transmission switchable FSR (2) is a non-lossy layer and is used to provide a transmission band. And each layer of the Frequency Selective radar wave absorber (FSR) with the switchable absorption and transmission is embedded with a PIN tube, a resistor and a capacitor lumped element. Under the first working condition, all PIN pipes are in a disconnected state, and the asymmetric transmission of electromagnetic waves can be realized.
Under the second working condition, all PIN pipes are conducted, the whole structure achieves the wave absorbing function, and the wave absorbing rate is larger than 90%.
The embodiment of the utility model provides an intelligence reconfigurable frequency selection radar wave absorption body based on PIN pipe discloses intelligence reconfigurable frequency selection radar wave absorption body based on PIN pipe, belongs to the electromagnetic compatibility field. Including broadband polarization rotator (1) and embedded realization of PIN pipe inhale and pass through switchable FSR (2), broadband polarization rotator constitute by three-layer composite structure: the grating structure layer is orthogonal up and down, and the middle part of the grating structure layer is an inclined elliptical layer; the imbibition reconfigurable FSR likewise consists of a three-layer structure: the middle non-consumption layer, the upper and lower consumption layers with the same structure are symmetrical with the middle non-consumption layer space, so that the transmission coefficients of the electromagnetic waves incident from the positive direction and the negative direction are the same. The asymmetric transmission of electromagnetic waves can be realized by utilizing the characteristic and combining the polarization rotator. (1) And (2) the physical dimensions of the two parts of structures are consistent with the working frequency band, and the two parts of structures are combined to form an intelligent frequency selection radar wave absorbing body (3). The utility model discloses a combine broadband polarization rotator and inhale through changeable FSR, rely on the change of PIN pipe state, realize the asymmetric transmission and the high energy electromagnetic wave isolation of electromagnetic wave to realize that impedance match and passband insert the index requirement that decreases for a short time. The antenna housing is designed by utilizing a composite structure metamaterial, and the broadband polarization rotating body is ingeniously combined with the FSR with switchable absorption and transmission. When low-power electromagnetic waves enter, the PIN tube is not excited to be in a disconnected state at the moment, the radome is an FSR, signals transmitted by the own antenna can be transmitted in a transmission band, and asymmetric transmission is formed for suppressing electromagnetic signals with the same polarization as that of the antenna on the outside. An absorption band is arranged in front of the transmission band, so that the reduction of out-of-band RCS can be realized, and the stealth protection of the antenna is facilitated; when high-power electromagnetic waves with interference outside enter, the PIN tube is excited and conducted, the antenna housing is a broadband wave absorber, the wave absorbing rate is greater than 90%, energy isolation can be effectively carried out, and the RCS (radar scattering cross section) can be reduced in the whole working bandwidth.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a three-dimensional schematic diagram of a unit structure provided by an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a broadband polarization rotator portion in a unit structure provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a suction-permeation switchable FSR portion in a unit structure provided by an embodiment of the present invention;
fig. 4 is an S parameter curve for realizing asymmetric transmission when a small signal is incident according to an embodiment of the present invention;
figure 5 is the embodiment of the utility model provides an S parameter curve when inhaling ripples shielding high energy interference electromagnetic wave.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention. As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The embodiment of the utility model provides an intelligence reconfigurable frequency selection radar wave absorption body based on PIN pipe, the structure is composite construction, and this composite construction includes two parts: a broadband polarization rotator (1) and a switchable FSR (2) of absorption and transmission.
The broadband polarization rotator (1) is composed of a 3-layer structure including: the front layer and the rear layer are mutually vertical grating structures to form a Fabry-Perot cavity, so that the bandwidth can be expanded. The middle layer of the broadband polarization rotator (1) is an elliptic resonance structure inclined by 45 degrees, and the polarization rotation function is realized.
The switchable absorption-transmission FSR (2) is also composed of a 3-layer structure, comprising: the front and back layers with the same structure are symmetrical with respect to the middle layer space, so that the transmission characteristics of electromagnetic waves transmitted in the forward direction and the reverse direction are the same. The intermediate layer of the absorption-transmission switchable FSR (2) is a non-lossy layer and is used to provide a transmission band. And PIN tubes, resistors and capacitor lumped elements are embedded on each layer of the absorption-transmission switchable FSR (2). Under the first working condition, all PIN pipes are in a disconnected state, and the asymmetric transmission of electromagnetic waves can be realized.
Under the second working condition, all PIN pipes are conducted, the whole structure achieves the wave absorbing function, and the wave absorbing rate is larger than 90%.
In practical application, the scheme described in this embodiment may have 2 working conditions: under a first working condition when small signals (less than or equal to about 50 watts) of normal communication power are incident, and under a second working condition when high-power interference electromagnetic wave signals (greater than or equal to about 100 watts) are incident.
Because the state of the PIN tube can be controlled by the magnitude of the external field intensity, when a small signal of normal communication power is incident or the antenna of one party transmits a communication signal, the PIN tube is in a disconnected state at the moment, and the asymmetric transmission of electromagnetic waves can be realized. When high-power electromagnetic waves are incident, the induced voltage enables the PIN tube to be conducted, the whole structure achieves a wave absorbing function, the wave absorbing rate is larger than 90%, and the interference of the high-energy electromagnetic waves to the communication antenna can be effectively isolated. The antenna with the structure can be self-adaptively switched in state, and accords with the intelligent application prospect. The structure utilizes the polarization rotating structure to realize the torsion of the polarization form of the transmission electromagnetic wave, and then combines the polarization sensitive wave absorber to realize the screening of the transmission electromagnetic wave, thereby achieving the index requirements of asymmetric transmission and absorption shielding of high-energy interference signals, and meeting the actual requirements of the electrical property of the window of the antenna housing and the suppression of the interference signals. The whole structure can realize the switching of wave absorption/wave transmission in an S wave band (2GHz-4GHz), thereby realizing the asymmetric transmission of electromagnetic waves and the shielding of high-energy electromagnetic waves, and having good impedance matching and low insertion loss in the transmission band.
In a preferred embodiment of the present embodiment, the perimeter of each periodic unit structure is 38mm, and the thickness is 8.25 cm. All dielectric substrates adopt F4B dielectric material with the relative dielectric constant of 2.65 and the loss tangent of 0.001. The width of the mutually perpendicular grating structures is 2.25mm, and the spacing is 5.25 mm. The major axis radius of the 45-degree inclined elliptical resonant structure is 24mm, and the minor axis radius is 5.25 mm. The thickness of each dielectric substrate of the broadband polarization rotator (1) is 2mm, and the interlayer spacing is 12.25 mm.
For example, as shown in fig. 1, the present invention is designed to have a structure in which the distance between the broadband polarization rotator (1) and the FSR (2) with switchable absorption and transmission is D. The circumference of the whole unit structure is 38mm, the whole thickness is about 8.25cm, and all dielectric substrates are made of F4B dielectric material with the relative dielectric constant of 2.65 and the loss tangent of 0.001.
As shown in FIG. 2, the width of the grating structures perpendicular to each other on the front layer and the rear layer of the broadband polarization rotator is 2.25mm, the interval is 5.25mm, the radius of the long axis of the ellipse inclined by 45 degrees is 24mm, the radius of the short axis is 5.25mm, the thickness of each dielectric substrate layer is 2mm, and the interval between the layers is 12.25 mm. The polarization rotator can realize cross polarization rotation between 1.8GHz and 6.2GHz and has the conversion rate of about 1.
In a preferred embodiment of this embodiment, the front and rear sacrificial layers are both 0.5mm thick. The width of the metal strip in the most central position is w1＝2.5mm，w22.8 mm. Width w of metal strip adjacent to said most intermediate position0The spacing between the individual metal strips was 2mm, 5 mm. The resistances of the resistors are respectively R1-80Q, R2-30 omega, and the distance between R2 is 24.7 mm. A capacitance value of 1.4x10-12F and the capacitors are spaced by 36.2 mm. The thickness of the non-consumption layer is 0.5mm, the interval between the two metal blocks is 1.6mm, and the capacitance value of the non-consumption layer is 5x10-9F. The interlayer spacing of the imbibition switchable FSR (2) was 20 mm. All PIN tubes were SMP1345-079 LF.
For example: as shown in FIG. 3, the front and rear layers of the FSR are lossy layers with a thickness of 0.5mm and the width of the most intermediate adjacent metal strip is w1＝2.5mm，w22.8mm, width w of metal strip adjacent thereto0The spacing between the metal strips was 2mm, the resistances of the selected resistors were R1-80 Ω, R2-30 Ω, and the distance between R2 was 24.7mm, respectively, and the capacitance was 1.4x10-12F and are spaced apart by 36.2 mm.
The middle layer is a non-consumption layer with a thickness of 0.5mm, the interval between two metal blocks is 1.6mm, and the capacitance value of the layer is 5x10-9F, selecting SMP1345-079LF for all PIN tubes, and enabling the interval between layers to be 20 mm. The FSR can be switched between wave-transparent and wave-absorbing. Combining the two parts of fig. 2 and 3 at a separation of 20mm allows to design a radome that allows for energy isolation and asymmetric transmission. When the PIN tube is in an off state, asymmetric transmission of electromagnetic waves can be realized, and the through-band insertion loss is only 0.72dB at 3.52 GHz. When the PIN is conducted, the antenna housing can absorb waves between 1.8GHz and 4.4GHz, the wave absorption rate can reach more than 90%, and the antenna housing has a good energy isolation effect on high-power interference signals.
The utility model discloses in the oval resonance unit structure in the used broadband polarization rotator can design into opening ring structure, can reach the effect equally. All dielectric substrates can use lower loss Rogers 5880 or low relative dielectric constant media, and pass band insertion loss can be further reduced as long as the relative dielectric constant and loss and thickness of the material meet good impedance matching.
The design of this scheme aim at: to prior art's problem, the utility model aims at providing a novel, electromagnetic properties is excellent inhale through reconfigurable realization electromagnetic wave asymmetric transmission and the frequency selection radar wave absorber (FSR) that energy is kept apart, overcome the problem that exists among the above-mentioned prior art. Specifically design an intelligence reconfigurable frequency selection radar wave absorber based on PIN pipe, the unit structure includes two part structures: the broadband polarization rotator (1) and the absorption-transmission switchable FSR (2) have the same physical size and working frequency band, and each part comprises a 3-layer structure.
The general design idea lies in that: aiming at the fact that an electronic information system realizes that a radar antenna of an external detection radar emits signals with inner stealth, shielding and isolation can be achieved for external high-power interference signals, and a PIN diode is an important lumped component, so that the design can be changed and switched in a self-adaptive mode between asymmetric transmission and energy isolation. The antenna housing has the advantages that the characteristics that the existing frequency selection antenna housing cannot transmit electromagnetic waves in a one-way mode, electromagnetic characteristics are not abundant, engineering realizability is relatively weak and the like are broken through, and an electromagnetic metamaterial polarization rotating structure, a high-resistance surface, lumped parameter elements and the like are introduced into the design of the antenna housing. The utility model discloses utilize polarization rotating surface and inhale the wave surface to combine PIN pipe design, reach asymmetric transmission, absorb shielding interference signal's index requirement, make its actual demand that satisfies antenna house window electrical property and clutter suppression.
An embodiment of the utility model discloses an inhale through reconfigurable realization energy isolation and asymmetric transmission's antenna house belongs to the electromagnetic compatibility field. Including broadband polarization rotator (1) and embedded realization of PIN pipe inhale and pass through switchable FSR (2), broadband polarization rotator constitute by three-layer composite structure: the grating structure layer is orthogonal up and down, and the middle part of the grating structure layer is an inclined elliptical layer; and the FSR with switchable absorption and permeation also comprises a three-layer structure: the middle non-consumption layer, the upper and lower consumption layers with the same structure are symmetrical with the middle non-consumption layer space, so that the transmission coefficients of the electromagnetic waves incident from the positive direction and the negative direction are the same. The asymmetric transmission of electromagnetic waves can be realized by utilizing the characteristic and combining the polarization rotator. (1) And (2) the physical size of the two parts of structures is consistent with the working frequency band, and the two parts of structures are combined to form an intelligent antenna housing (3). The utility model discloses a combine broadband polarization rotator and inhale through changeable FSR, rely on the change of PIN pipe state, realize the asymmetric transmission and the high energy electromagnetic wave isolation of electromagnetic wave to realize that impedance match and passband insert the index requirement that decreases for a short time.
The utility model discloses in inhale and pass through switchable antenna house utilize the design of composite construction metamaterial to form, broadband polarization rotator with inhale and pass through switchable FSR and combine ingeniously. When low-power electromagnetic waves enter, the PIN tube is not excited to be in a disconnected state at the moment, the radome is an FSR, signals transmitted by the own antenna can be transmitted in a transmission band, and asymmetric transmission is formed for suppressing electromagnetic signals with the same polarization as that of the antenna on the outside. An absorption band is arranged in front of the transmission band, so that the reduction of out-of-band RCS can be realized, and the stealth protection of the antenna is facilitated; when high-power electromagnetic waves with interference outside enter, the PIN tube is excited and conducted, the antenna housing is a broadband wave absorber, the wave absorbing rate is greater than 90%, energy isolation can be effectively carried out, and the RCS (radar scattering cross section) can be reduced in the whole working bandwidth.
In summary, the following advantages can be achieved:
(1) the utility model discloses select the antenna house frequently to current and can not realize one-way transmission, utilize polarization rotator and polarization sensitive absorbing body to cascade mutually mode to realize the asymmetric propagation of electromagnetic wave for the first time, the utility model discloses the viewpoint is novel, has innovation and simple structure, and it is more convenient to prepare.
(2) The utility model discloses utilize voltage-controlled conductive structure to participate in designing the sensitive wave absorber of polarization for the wave absorber can pass through the ripples and inhale and switch between ripples two kinds of states, like this alright self-adaptation switch between asymmetric transmission and energy isolation.
(3) The utility model discloses a loading lumped element PIN pipe through the control to PIN pipe state, realizes passing through ripples and inhale the switching between the ripples, is applied to under the situation that communication environment is complicated, the application prospect of "intellectuality" of laminating more.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points. The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The intelligent reconfigurable frequency selective radar wave absorber based on the PIN tube is characterized in that the reconfigurable frequency selective radar wave absorber is of a composite structure, and the composite structure comprises two parts: a broadband polarization rotator (1) and an FSR (2) with switchable absorption and transmission;
the broadband polarization rotator (1) is composed of a 3-layer structure including: the front layer and the rear layer are mutually vertical grating structures to form a Fabry-Perot cavity; the middle layer of the broadband polarization rotating body (1) is an elliptic resonance structure inclined by 45 degrees;
the switchable absorption-transmission FSR (2) is also composed of a 3-layer structure, comprising: the front and rear consumable layers with the same structure are spatially symmetrical with respect to the middle layer; the middle layer of the FSR (2) with switchable absorption and permeation is a lossless layer; and each layer of the FSR (2) with switchable absorption and permeation is embedded with a PIN tube, a resistor and a capacitor;
under a first working condition, all PIN tubes are in a disconnected working state;
under the second operating mode, all PIN pipes are in the operating condition that switches on.
2. The PIN-tube-based intelligent reconfigurable frequency-selective radar absorber of claim 1, wherein each periodic unit structure has a perimeter of 38mm and a thickness of 8.25 cm.
3. The PIN-tube-based intelligent reconfigurable frequency-selective radar absorber as claimed in claim 1, wherein all dielectric substrates are made of F4B dielectric material with a relative dielectric constant of 2.65 and a loss tangent of 0.001.
4. The PIN-tube-based intelligent reconfigurable frequency-selective radar absorber of claim 1, wherein the mutually perpendicular grating structures are 2.25mm wide and 5.25mm apart;
the radius of the long axis of the elliptic resonance structure inclined by 45 degrees is 24mm, and the radius of the short axis is 5.25 mm;
the thickness of each dielectric substrate of the broadband polarization rotator (1) is 2mm, and the interlayer spacing is 12.25 mm.
5. The PIN-tube-based intelligent reconfigurable frequency-selective radar absorber of claim 1, wherein the front and rear lossy layers are both 0.5mm thick;
the width of the metal strip in the most central position is w1＝2.5mm，w2＝2.8mm；
Width w of metal strip adjacent to said most intermediate position0The spacing between the individual metal strips was 2mm, 5 mm.
6. The PIN-tube-based intelligent reconfigurable frequency-selective radar absorber as claimed in claim 1, wherein the resistances of the resistors are respectively R1-80 Ω, R2-30 Ω, and the distance between R2 is 24.7 mm;
a capacitance value of 1.4x10-12F and the capacitors are spaced by 36.2 mm.
7. The PIN-tube-based intelligent reconfigurable frequency-selective radar absorber as claimed in claim 1, wherein the thickness of the lossless layer is 0.5mm, the spacing between the two metal blocks is 1.6mm, and the capacitance value of the lossless layer is 5x10-9F；
The interlayer spacing of the imbibition switchable FSR (2) was 20 mm.
8. The intelligent reconfigurable frequency selective radar absorber based on PIN tubes as claimed in claim 1, wherein all PIN tubes are SMP1345-079 LF.
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| CN202021396378.5U CN212848818U (en) | 2020-07-15 | 2020-07-15 | Intelligent reconfigurable frequency selection radar wave absorber based on PIN (personal identification number) tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114498047A (en) * | 2022-01-10 | 2022-05-13 | 西安电子科技大学 | Broadband low-RCS (radar cross section) super-surface structure based on scattering and absorption synergistic effect |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114498047A (en) * | 2022-01-10 | 2022-05-13 | 西安电子科技大学 | Broadband low-RCS (radar cross section) super-surface structure based on scattering and absorption synergistic effect |
| CN114498047B (en) * | 2022-01-10 | 2023-03-28 | 西安电子科技大学 | Broadband low-RCS (radar cross section) super-surface structure based on scattering and absorption synergistic effect |
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| CB03 | Change of inventor or designer information |
Inventor after: Kong Xiangkun Inventor after: Yuan Jing Inventor after: Jin Xin Inventor before: Kong Xiangkun Inventor before: Yuan Jing |
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| CB03 | Change of inventor or designer information |