CN211404744U - Strong coupling frequency selection surface structure insensitive to incident electromagnetic wave full angle - Google Patents
Strong coupling frequency selection surface structure insensitive to incident electromagnetic wave full angle Download PDFInfo
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- CN211404744U CN211404744U CN201922367876.0U CN201922367876U CN211404744U CN 211404744 U CN211404744 U CN 211404744U CN 201922367876 U CN201922367876 U CN 201922367876U CN 211404744 U CN211404744 U CN 211404744U
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Abstract
The utility model discloses a strong coupling frequency selective surface structure insensitive to incident electromagnetic wave full angle. The metal chip comprises a plurality of closely arranged periodic unit structures, wherein each periodic unit structure comprises a top-bottom layer metal patch, a dielectric plate and upper and lower semi-metal through holes; the top and bottom metal patches are respectively stuck on the upper and lower surfaces of the dielectric slab and are three-dimensionally symmetrical with the center of the dielectric slab; the top and bottom metal patches comprise circular patches and rectangular patches which are connected; the circular patch is arranged at the center of the surface of the dielectric plate, the semimetal via hole is positioned in the middle of the upper edge/lower edge of the surface of the dielectric plate, and the circular patch is connected with the semimetal via hole through the rectangular patch. The utility model is suitable for a subminiaturization, ultra-thin structure and the stable frequency selective surface design of wide angle of incidence, its unit size is minimum with thickness, and resonant frequency is stable unchangeable at 0 ~ 88 incident angle within range.
Description
Technical Field
The utility model relates to a super surface technical field especially has related to a strong coupling frequency selective surface structure insensitive to incident electromagnetic wave full angle, can be applied to subminiaturization, ultra-thin structure and the stable frequency selective surface design of wide angle of incidence.
Background
Frequency selective surface fss (frequency selective surfaces), also known as spatial filters, is usually composed of a two-dimensional periodic structure. The antenna has the functions of transmitting, reflecting or absorbing incident electromagnetic waves under specific frequency, so that the antenna is widely applied to the design of high-performance radome radomes, antenna reflecting plates, space electromagnetic interference shields and absorbers and electromagnetic cloaking.
Over the past two decades, a large number of experts and scholars carry out deep research on the frequency selection surface, and numerous technical breakthroughs are made from a simple single-order resonance structure to multi-order wide-bandwidth adjustable function realization with a complex structure and then to work band edge steep-drop research. However, many studies have been conducted based on the case where electromagnetic waves are incident perpendicularly. With the rapid development of communication technology, in practical application, a functional device designed based on the FSS is not sensitive to an incident angle, so that the high-performance operation of the system can be guaranteed. However, FSS structures are often sensitive to the incident angle, and as the incident angle changes, the operating frequency of FSS will shift, resulting in degradation of system performance, so that how to improve the angular performance of the frequency selective surface becomes a challenge. In addition, with the development of communication towards high frequency and high speed, chip packaging and other functional devices towards high integration, the size of the traditional frequency selection surface structure based on fluctuation physical resonance needs to be comparable to the wavelength of the working frequency, so that the structure is huge, the requirements of engineering realization and system miniaturization are not facilitated, and the microminiaturization ultrathin FSS structure which can be applied to chip packaging and other narrow spaces becomes another great challenge. Therefore, how to design a microminiaturized and ultra-thin FSS structure which is not sensitive to the whole angle of the incident electromagnetic wave is crucial to the development of the new generation of mobile communication technology.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of above-mentioned prior art, the utility model provides a strong coupling frequency selective surface structure insensitive to incident electromagnetic wave full angle, the high electric coupling between make full use of structural layer realizes the high miniaturization degree of structure, realizes that structural resonance frequency is insensitive completely to incident electromagnetic wave. The utility model is suitable for a subminiaturization, ultra-thin structure and the stable frequency selective surface design of wide angle of incidence, its unit size is minimum with thickness, and resonant frequency is stable unchangeable at 0 ~ 88 incident angle within range.
The utility model provides a technical scheme that above-mentioned technical problem adopted is:
the frequency selective surface structure comprises a plurality of closely arranged periodic unit structures, each periodic unit structure mainly comprises a dielectric layer, two metal layers and a metal through hole for connecting the two metal layers, wherein the two metal layers are respectively attached to the two surfaces of the dielectric layer; the periodic unit structure comprises a top metal patch P1Dielectric plate D0And a bottom metal patch P2And connecting the top metal patch P1And a bottom metal patch P2Upper and lower semi-metal via hole V between1And V2Composition is carried out; top metal patch P1Is adhered to a medium plate D0Upper surface, bottom metal patch P2Is adhered to a medium plate D0Lower surface, bottom layer metal patch P2Is a top metal patch P1With a dielectric plate D0The solid geometric center of the light-emitting diode is arranged in a three-dimensional symmetrical mode with the center as the center; the top metal patch P1Mainly composed of a top circular patch A1And top rectangular patch B1Are connected to form the product; top circular patch A1Arranged on a dielectric plate D0Lower half metal via hole V at center of upper surface1On the dielectric plate D0The middle of the lower edge of the upper surface,top circular patch A1And a lower semi-metal via V1Pass through the top rectangle paster B1Connecting; the bottom metal patch P2Mainly composed of a bottom circular patch A2Square patch B with bottom2Are connected to form the product; bottom circular patch A2Arranged on a dielectric plate D0At the center of the lower surface, an upper semi-metal via V0On the dielectric plate D0Middle, bottom circular patch A of upper edge of lower surface2And an upper half-metal via V2Through the bottom rectangular patch B2And (4) connecting.
The top circular patch A1And a bottom circular patch A2The circles are the same size.
The top rectangular patch B1Square patch B with bottom2With a dielectric plate D0The solid geometric center of the metal via hole is in solid symmetry with the center, and the lower half metal via hole V is in solid symmetry1Position and upper half-metal via V2Position by dielectric plate D0The geometric center of the solid is in central solid symmetry.
In the frequency selective surface structure, a plurality of periodic unit structures in the same column are connected, and a top rectangular patch B of a plurality of periodic unit structures in the same column1Square patch B with bottom2Are all arranged in parallel, so that the lower half metal via hole V of the periodic unit structure positioned at the upper side in two adjacent periodic unit structures1And an upper half metal via V of the periodic cell structure at the lower side2Butt-jointed to form a circular via hole, so that the top rectangular patch B of the periodic unit structure on the upper side1And a bottom rectangular patch B of a periodic unit structure on the lower side2Connected by circular vias.
The dielectric plate D0A Rogers RT5880 plate was used, the dielectric constant was 2.2 and the dielectric loss tangent was 0.0009.
The frequency of the electromagnetic wave incident on the frequency selective surface structure is 1GHz-5 GHz.
The angle of the electromagnetic wave incident on the frequency selective surface structure is +/-88°When the range is changed, the transmission zero point is always kept unchanged at 2.35 GHz.
The method is applied to the antenna housing insensitive to the angle, the radar cover and the full-angle stable absorber, and has great application value in the fields of modern communication, radar, military, national defense and the like.
The utility model relates to a reflection-type FSS, the electromagnetic wave incides in free space frequency selective surface structure can produce selective characteristic to specific incident frequency's electromagnetic wave for the electromagnetic wave signal total reflection of operating frequency range, and the outband signal can pass through frequency selective surface structure, structural resonance frequency is insensitive completely to incident angle simultaneously.
The utility model is suitable for a subminiaturization, ultra-thin structure and the stable frequency selective surface design of wide angle of incidence, its unit size is minimum with thickness, and resonant frequency is stable unchangeable at 0 ~ 88 incident angle within range. The method can be well applied to the design of angle-insensitive antenna covers, radar covers and full-angle stable absorbers, and has great application value in the fields of modern communication, radars, military, national defense and the like.
The utility model discloses an antenna house theory of operation as follows:
when electromagnetic waves in space reach the surface of the structure at different angles theta, different modes of the electromagnetic waves can be structurally excited, so that equivalent parameters of the structure are changed under different incident angles, the performance of the structure is changed, and in order to overcome the incident angle problem, the utility model provides a design concept of a strong coupling frequency selection surface to improve the angle stability of an FSS structure;
the utility model provides a design concept on strong coupling frequency selective surface, in the geometric center department of unit structure, circular paster A is being distributed respectively to top layer and bottom metal1And A2And because the design adopts a very thin dielectric layer, a very strong coupling effect exists between the circular metals corresponding to the top layer and the bottom layer, and an electric field is always bound between the two wafers, so that a strong coupling capacitor is formed, and the strong coupling cannot be changed by incident electromagnetic waves even in oblique incidence and always keeps a stable mode, so that the proposed strong coupling frequency selection surface has good angle stability.
As shown in FIG. 6, the electric field distribution at the middle of the medium at the resonant frequency of 2.35GHz can be found to be completely confined to the top circular patch A1And the bottom circular patch A2It can be equivalent to a large capacitance Cs from the viewpoint of an equivalent circuit.
The structural current distribution at the resonant frequency of 2.35GHz of the frequency selective surface structure is shown in FIG. 7, and the current is mainly concentrated in the upper and lower layers of rectangular patches B1And B2And a metal via hole connecting the upper and lower layers. Therefore, the rectangular metal patch can be regarded as the inductor L0Likewise, a metal via is also equivalent to an inductor Lv. The equivalent circuit model of the proposed structure is shown in fig. 2, the inductance L0And LvCan be equivalent to an inductor LsInductance LsAnd a coupling capacitor CsConstituting an LC series resonant circuit so as to be at the resonant frequency
A stop band is formed nearby, so that the incident electromagnetic wave in the frequency band is reflected.
Metal via hole V for connecting upper and lower layers of rectangular patches1And V2The angle stability is very important, if the metal via hole is not provided, the principle of structural resonance belongs to fluctuation physics, and the resonance is mainly influenced by the size length of a structural point and is particularly sensitive to an incident angle; and the existence of the metal via hole ensures that the structure is always in the circuit physics and ensures the angle stability of the structure.
The utility model has the advantages that:
the utility model discloses strong coupling frequency selective surface has adopted the super-miniaturization design that the strong coupling mechanism between the layer realized frequency selective surface structure, and final unit size is about 0.07 lambda, can place more units in narrow and small space to make the board of making more be close to infinite periodic structure, and in addition, this structure thickness is extremely thin, has reduced the whole weight of structure, and is lighter, is favorable to the miniaturization and the integrated design of system, but this miniaturization degree still is applicable to traditional PCB technology and processes production.
The utility model discloses a structure can be equivalent to a LC series resonance circuit, produces a stable stop band near resonant frequency 2.35GHz, and wherein-10 dB restraines the bandwidth and reaches 2GHz (1.5GHz ~ 3.5GHz), has fine suppression effect to the incident electromagnetic wave in this frequency channel.
The utility model discloses unique structural design makes the utility model discloses have fabulous angle stability can, at 88°The transmission zero point is quite stable in the incident angle range, even when the transmission zero point is close to 90 degrees, the resonance frequency is still stable at 2.35GHz, and the full-angle insensitivity to incident electromagnetic waves is realized.
The design of the radar antenna has great breakthrough and has great application value in the fields of modern communication, radar, military, national defense and the like.
The utility model provides a strong coupling frequency selective surface can extensively be extended in the design of the insensitive high performance antenna house of angle, radome and the stable absorber in full angle, has high using value simultaneously in modern communication, radar and military communication such as FSS functional device miniaturization, 5G.
In summary, the utility model is suitable for a subminiaturization, ultra-thin structure and the stable frequency selective surface design of wide angle of incidence, its resonant frequency can keep unchangeable in the full angle range [0 ~ 90 °), has broken through the sensitive restriction of traditional FSS structure to the angle of incidence, provides design and theoretical guidance for the design of high performance FSS functional device. The method has great application value in the fields of modern communication, radar, military, national defense and the like.
Drawings
Fig. 1 is a three-dimensional structure diagram of an antenna housing according to an embodiment of the present invention;
FIG. 2 is a three-dimensional view of the unit structure of the present invention and its corresponding equivalent circuit model;
FIG. 3 is a front view of the unit structure of the present invention;
FIG. 4 is a top metal structure view of the unit structure of the present invention;
FIG. 5 is a bottom metal structure view of the unit structure of the present invention;
FIG. 6 is the electric field distribution view of the cell structure of the present invention in the medium at 2.35 GHz;
FIG. 7 is a view of the current distribution in the top metal structure at 2.35GHz for the unit structure of the present invention;
FIG. 8 is a transmission spectrum of the present invention when an incident electromagnetic wave is incident from multiple angles;
fig. 9 is a comparison graph of the simulation result of the equivalent circuit model and the full-wave simulation result of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1, the embodied frequency selective surface structure includes a plurality of closely arranged periodic unit structures, each of which mainly comprises a dielectric layer, two metal layers and a metal via hole connecting the two metal layers, wherein the two metal layers are respectively attached to two surfaces of the dielectric layer.
As shown in fig. 2 and 3, the periodic unit structure includes a top metal patch P1Dielectric plate D0And a bottom metal patch P2And connecting the top metal patch P1And a bottom metal patch P2Upper and lower semi-metal via hole V between1And V2Composition is carried out; top metal patch P1Is adhered to a medium plate D0Upper surface, bottom metal patch P2Is adhered to a medium plate D0Lower surface, bottom layer metal patch P2Is a top metal patch P1With a dielectric plate D0Is arranged in a three-dimensional symmetrical way with the solid geometric center as the center.
As shown in fig. 4, the top metal patch P1Mainly composed of a top circular patch A1And top rectangular patch B1Are connected to form the product; top circular patch A1Arranged on a dielectric plate D0Lower half metal via hole V at center of upper surface1On the dielectric plate D0The middle of the lower edge of the upper surface is a top circular patch A1And a lower semi-metal via V1Pass through the top rectangle paster B1And (4) connecting. As shown in fig. 5, the bottom metal patch P2Mainly composed of a bottom circular patch A2Square patch B with bottom2Are connected to form the product; bottomCircular patch A2Arranged on a dielectric plate D0At the center of the lower surface, an upper semi-metal via V2On the dielectric plate D0Middle, bottom circular patch A of upper edge of lower surface2And an upper half-metal via V2Through the bottom rectangular patch B2And (4) connecting.
As shown in fig. 2, a top circular patch a1And a bottom circular patch A2The circular patch B with the same size and rectangular top1Square patch B with bottom2With a dielectric plate D0The solid geometric center of the metal via hole is in solid symmetry with the center, and the lower half metal via hole V is in solid symmetry1Position and upper half-metal via V2Position by dielectric plate D0The geometric center of the solid is in central solid symmetry.
In the frequency selective surface structure, a plurality of periodic unit structures in the same row are not connected, a plurality of periodic unit structures in the same column are connected, and a top rectangular patch B of the plurality of periodic unit structures in the same column is connected1Square patch B with bottom2Are all arranged in parallel, so that the lower half metal via hole V of the periodic unit structure positioned at the upper side in two adjacent periodic unit structures1And an upper half metal via V of the periodic cell structure at the lower side2Butt-jointed to form a circular via hole, so that the top rectangular patch B of the periodic unit structure on the upper side1And a bottom rectangular patch B of a periodic unit structure on the lower side2Through circular via hole connection, the top layer is connected with the bottom layer metal through the metal via hole at the edge of the structure, and the semi-metal via holes on the upper side and the lower side of the connected upper side and lower side of the plurality of periodic unit structures in the same row are respectively connected with the head-tail semi-metal via holes of the adjacent unit structures.
In the embodiment, the dielectric plate D0A Rogers RT5880 plate was used, the dielectric constant was 2.2 and the dielectric loss tangent was 0.0009.
The embodiment of the utility model provides an use the full angle reflector as the example, specifically explain the utility model discloses the embodiment of each part and each structural parameter are to the influence of this model performance:
as shown in figure 1 of the drawings, in which,the embodiment has adopted 20 × 20 periodic cell array, the utility model discloses well unit period is 10mm, and each partial structure size is shown as table 1, can carry out the selection of corresponding size according to specific design objective in practical application. When the top layer is a circular metal patch A1And the bottom layer circular metal patch A2The relative area of the stop band is increased, so that the stop band moves towards the low frequency direction, which is mainly caused by A1And A2The size of the strong coupling capacitance is controlled, and when the relative areas of the strong coupling capacitance and the strong coupling capacitance are increased, the corresponding capacitance C is controlledsIncreasing, thereby causing the resonant frequency to shift to a lower frequency; similarly, when the top metal patch B1Or top metal patch B2When the width increases, the stop band will move towards high frequencies, mainly due to the fact that when B is increased1Or B2When the width is increased, the equivalent inductance of the transformer is correspondingly reduced, so that the transmission zero point is increased.
In addition, the dielectric of the structure has a large impact on the frequency selective surface properties because the dielectric constant and dielectric thickness of the dielectric will control the coupling between the top and bottom metal wafers. As the dielectric constant increases, the resonant frequency will shift to lower frequencies, and likewise, as the thickness of the medium increases, the coupling will be reduced, causing the resonant frequency to shift to higher frequencies. The important influence of the medium adds an important reference point for the adjustment of the performance of the frequency selective surface, so that the design of the target structure is more flexible.
TABLE 1 the sizes of the parts of the structure
| P | l0 | W0 | r1 |
| 10mm | 3mm | 0.11mm | 2mm |
| r2 | εr | h0 | |
| 0.15mm | 2.2 | 0.254mm |
The utility model discloses the Rogers RT5880 panel that the intermediate plate adopted, its cycle unit size is 10 mm. The plate is characterized by very low dielectric loss and thus less impact on the insertion loss of the pass band. However, the sheet material is relatively expensive, and in practical use, the type of medium can be appropriately selected and designed according to a predetermined target.
The strong coupling frequency selective surface is the design and method innovation of the utility model. The design on traditional frequency selective surface mainly considers the coupling between same layer inner structure, and is different with traditional design, the utility model provides a coupling of different interlaminar structures is introduced in the coupling of same layer except considering to strong coupling frequency selective surface simultaneously, and the intensity of this coupling receives the influence of structure relative area and dielectric permittivity, thickness isoparametric for the adjustment of structure has increased more dimensions, makes the design of structure more nimble. In addition, the introduced strong coupling between layers is very beneficial to the miniaturization design of the structure, the miniaturization degree of the structure can be extremely small, the structure is not sensitive to the incident angle, and the structural design with stable full angle is further realized. The thinner the dielectric thickness is, the more beneficial to the miniaturized design of the structure, so that the structure can be miniaturized in the transverse direction and can be designed to be ultrathin in the longitudinal direction. Table 2 specifically describes the effect of metal circular patch radius and dielectric constant, dielectric thickness on transmission performance.
TABLE 2 influence of radius of metal circular patch, dielectric constant and dielectric thickness on transmission performance
The transmission spectrum of the embodiment when the electromagnetic wave is incident from multiple angles is shown in fig. 8, and it can be found that the resonant frequency is always kept at 2.35GHz within the full-angle range [ 0-90 °), thereby realizing the design of insensitivity to the full-angle of incidence. Figure 9 has described the contrast of equivalent circuit model simulation result with the full wave simulation result simultaneously, and among the traditional FSS structural design, the equivalent circuit model can only simulate vertical incidence's transmission performance, can discover, the utility model discloses well equivalent circuit except the equivalence to the vertical incidence condition, equivalent result when the multi-angle is incided also coincide completely with whole simulation result, has fully verified the theoretical analysis on the strong coupling frequency selective surface that proposes.
Therefore, the utility model discloses an ultra-thin insensitive frequency selective surface texture design to incident electromagnetic wave full angle of subminiaturization.
Claims (7)
1. A strong coupling frequency selective surface structure insensitive to the whole angle of incident electromagnetic waves comprises a plurality of closely arranged periodic unit structures, each periodic unit structure mainly comprises a dielectric layer, two metal layers and a metal via hole for connecting the two metal layers, wherein the two metal layers are respectively attached to the two surfaces of the dielectric layer; the method is characterized in that: the periodic unit structure comprises a top metal patch P1Dielectric plate D0And a bottom metal patch P2And connecting the top metal patch P1And a bottom metal patch P2Upper and lower semi-metal via hole V between1And V2Composition is carried out; top metal patch P1Is adhered to a medium plate D0Upper surface, bottom metal patch P2Is adhered to a medium plate D0Lower surface, bottom layer metal patch P2Is a top metal patch P1With a dielectric plate D0The solid geometric center of the light-emitting diode is arranged in a three-dimensional symmetrical mode with the center as the center; the top metal patch P1Mainly composed of a top circular patch A1And top rectangular patch B1Are connected to form the product; top circular patch A1Arranged on a dielectric plate D0Lower half metal via hole V at center of upper surface1On the dielectric plate D0The middle of the lower edge of the upper surface is a top circular patch A1And a lower semi-metal via V1Pass through the top rectangle paster B1Connecting; the bottom metal patch P2Mainly composed of a bottom circular patch A2Square patch B with bottom2Are connected to form the product; bottom circular patch A2Arranged on a dielectric plate D0At the center of the lower surface, an upper semi-metal via V2On the dielectric plate D0Middle, bottom circular patch A of upper edge of lower surface2And an upper half-metal via V2Through the bottom rectangular patch B2And (4) connecting.
2. A strongly coupled frequency selective surface structure insensitive to the total angle of an incident electromagnetic wave, as claimed in claim 1, characterized in that: the top circular patch A1And a bottom circular patch A2The circles are the same size.
3. A strongly coupled frequency selective surface structure insensitive to the total angle of an incident electromagnetic wave, as claimed in claim 1, characterized in that: the top rectangular patch B1Square patch B with bottom2With a dielectric plate D0The solid geometric center of the metal via hole is in solid symmetry with the center, and the lower half metal via hole V is in solid symmetry1Position and upper half-metal via V2Position by dielectric plate D0The geometric center of the solid is in central solid symmetry.
4. A strongly coupled frequency selective surface structure insensitive to the total angle of an incident electromagnetic wave, as claimed in claim 1, characterized in that: frequency ofIn the selective surface structure, a plurality of periodic unit structures in the same column are connected, and a top rectangular patch B of a plurality of periodic unit structures in the same column is selected1Square patch B with bottom2Are all arranged in parallel, so that the lower half metal via hole V of the periodic unit structure positioned at the upper side in two adjacent periodic unit structures1And an upper half metal via V of the periodic cell structure at the lower side2Butt-jointed to form a circular via hole, so that the top rectangular patch B of the periodic unit structure on the upper side1And a bottom rectangular patch B of a periodic unit structure on the lower side2Connected by circular vias.
5. A strongly coupled frequency selective surface structure insensitive to the total angle of an incident electromagnetic wave, as claimed in claim 1, characterized in that: the dielectric plate D0A Rogers RT5880 plate was used, the dielectric constant was 2.2 and the dielectric loss tangent was 0.0009.
6. A strongly coupled frequency selective surface structure insensitive to the total angle of an incident electromagnetic wave, as claimed in claim 1, characterized in that: the frequency of the electromagnetic wave incident on the frequency selective surface structure is 1GHz-5 GHz.
7. A strongly coupled frequency selective surface structure insensitive to the total angle of an incident electromagnetic wave, as claimed in claim 1, characterized in that: when the angle of the electromagnetic wave incident to the frequency selection surface structure is changed within the range of +/-88 degrees, the transmission zero point is always kept unchanged at 2.35 GHz.
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| CN112255603A (en) * | 2020-10-23 | 2021-01-22 | 济南浪潮高新科技投资发展有限公司 | Multi-band double-layer FSS design based on Jaumann screen |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112255603A (en) * | 2020-10-23 | 2021-01-22 | 济南浪潮高新科技投资发展有限公司 | Multi-band double-layer FSS design based on Jaumann screen |
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