CN114899615B - Assembled four-frequency band-stop frequency selection surface - Google Patents
Assembled four-frequency band-stop frequency selection surface Download PDFInfo
- Publication number
- CN114899615B CN114899615B CN202210673119.XA CN202210673119A CN114899615B CN 114899615 B CN114899615 B CN 114899615B CN 202210673119 A CN202210673119 A CN 202210673119A CN 114899615 B CN114899615 B CN 114899615B
- Authority
- CN
- China
- Prior art keywords
- cylinder
- corner
- metal
- dielectric
- medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002184 metal Substances 0.000 claims abstract description 82
- 238000005452 bending Methods 0.000 claims description 12
- 230000005672 electromagnetic field Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 18
- 239000000758 substrate Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 230000010287 polarization Effects 0.000 description 7
- 230000004044 response Effects 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 238000004088 simulation Methods 0.000 description 6
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 4
- 235000017491 Bambusa tulda Nutrition 0.000 description 4
- 241001330002 Bambuseae Species 0.000 description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 4
- 239000011425 bamboo Substances 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 4
- 238000010146 3D printing Methods 0.000 description 3
- 238000009713 electroplating Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000012938 design process Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Aerials With Secondary Devices (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses an assembled four-frequency band-stop frequency selection surface in the technical field of electromagnetic fields and microwaves, which is formed by periodically arranging a plurality of unit structures in a two-dimensional plane direction, wherein each unit structure is assembled by an inner medium cylinder and four corner-shaped medium blocks and then embedded in an outer medium cylinder, an n-type bent metal strip stretching towards a three-dimensional space relative to a corner-shaped medium block is arranged at the inner medium cylinder, a first metal fan ring is arranged at the bottom of the inner medium cylinder, an L-type bent metal strip corresponding to the end part of the n-type bent metal strip is arranged on the upper surface of the corner-shaped medium block, a second metal fan ring corresponding to the end part of the first metal fan ring is arranged on the lower surface of the corner-shaped medium block, and the n-type bent metal strip and the L-type bent metal strip form a bent metal ring stretching in three dimensions. According to the invention, the metal square ring resonance unit on the two-dimensional plane is subjected to three-dimensional space stretching, so that good angle stability and smaller electric size can be realized in a dual-polarization mode.
Description
Technical Field
The invention relates to an assembled four-band-stop frequency selection surface, and belongs to the technical field of electromagnetic fields and microwaves.
Background
The frequency selective surface (Frequency Selective Surface, FFS) is usually a single-layer or multi-layer periodic structure formed by arranging metal patches (or apertures on a metal screen) according to a certain rule, and is widely used in microwave integrated circuit systems. As a spatial filter, the frequency selective surface is capable of achieving a bandpass, bandstop, lowpass or highpass frequency response that is a function of not only frequency but also electromagnetic wave incident angle and polarization. With the rapid development of satellite communications, modern military systems, high gain antenna sub-reflectors, the application requirements of the corresponding scenarios are increasing, and in order to increase the capacity of channels and ensure the security of multipath communications, frequency selective surfaces with multiple transmission or reflection bands are of great interest.
In recent years, various methods have been used for design of multiband frequency selective surfaces, such as disturbance design between frequency selective surface units to increase the number of resonance bands; the physical length of the resonance unit is increased through plane bending operation, and a multi-order resonance mode is generated, so that more frequency bands are realized; adopting a fractal technology, and realizing multiband filter response by means of self-similarity; the multi-band design is realized by combining a plurality of unit structures with different resonance frequency points; through the complementary design of the upper and lower layers, the multiband frequency selection surface is designed by means of electromagnetic coupling; through multi-screen cascading, the multi-band performance is realized by utilizing different frequencies to select different resonance frequency points of the surface screen. However, when the above method is applied to design a miniaturized, multiband frequency selective surface, the degree of freedom of design of the unit structure thereof on a two-dimensional plane is limited.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides an assembled four-band-stop frequency selection surface, and aims to solve the technical problem that the degree of freedom of design of a unit structure of the conventional multi-band frequency selection surface on a two-dimensional plane is limited.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
The utility model provides a pin-connected panel four-frequency band stop frequency selective surface, is formed by a plurality of unit structures in two-dimensional plane direction periodic arrangement, every unit structure is assembled by interior medium section of thick bamboo and four turning shape dielectric piece and is inlayed in the outer medium section of thick bamboo, interior medium section of thick bamboo department is provided with the n type metal strip of buckling to three-dimensional space tensile for turning angle shape dielectric piece, and interior medium section of thick bamboo bottom is provided with first metal fan ring, the upper surface of turning angle shape dielectric piece is provided with the L type metal strip of buckling that corresponds with n type metal strip tip, and the lower surface is provided with the second metal fan ring that corresponds with first metal fan ring tip, n type metal strip of buckling and L type metal strip of buckling constitute a buckling metal ring by three-dimensional stretching, first metal fan ring and second metal fan ring constitute a metal ring.
Further, the relative dielectric constants of the inner dielectric cylinder, the corner-shaped dielectric block and the outer dielectric cylinder are all 2.8.
Further, the top surface of the inner medium cylinder is cross-shaped and comprises a circular medium cylinder and four strip-shaped medium blocks which are equidistantly distributed on the circumferential side wall of the circular medium cylinder, the n-type bending metal strip is located at the upper end of the strip-shaped medium block, and the first metal fan ring is located at the bottom of the strip-shaped medium block.
Further, the heights of the circular medium cylinder, the strip-shaped medium block and the outer medium cylinder are equal, and the width of the L-shaped bending metal strip is equal to the width of the n-shaped bending metal strip.
Further, the corner-shaped medium blocks are provided with arc-shaped inner walls with the same radian radius as the circular medium cylinder, and the distance between adjacent corner-shaped medium blocks is equal to the width of the strip-shaped medium blocks.
Further, the top surface of the outer medium cylinder is square, and the length and the width of the outer medium cylinder are equal.
Compared with the prior art, the invention has the beneficial effects that:
According to the assembled four-band-stop frequency selection surface, in the unit structure design process, by means of the design concept of three-dimensional stretching, the physical perimeter of a metal square ring is increased by stretching a metal square ring resonance unit on a two-dimensional plane in three-dimensional space, the perimeter of a closed loop is greatly increased under the condition that the unit structure area is unchanged, thereby generating a multi-order resonance mode, forming three stop bands, meanwhile, metal circular ring resonance on the lower surface of the unit structure is introduced with one stop band, the design of the four-band-stop frequency selection surface is finally realized, the resonant frequency of the unit structure is reduced due to the increase of the perimeter of the closed loop, and the miniaturization design of the frequency selection surface is facilitated, so that the problem that the design freedom degree of the unit structure on the two-dimensional plane is limited is effectively overcome. In addition, the four-frequency band-stop frequency selection surface object provided by the invention can be processed and assembled by adopting a three-dimensional printing technology and an electroplating technology.
Drawings
Fig. 1 is a three-dimensional schematic diagram of a unit structure of an assembled four-band rejection frequency selective surface according to an embodiment of the present invention;
FIG. 2 (a) is a schematic illustration of the outer media cartridge components and sizing of the cell structure of an embodiment of the present invention;
FIG. 2 (b) is a schematic illustration of the components of the inner media cartridge and their dimensions that make up the cell structure of an embodiment of the present invention;
FIG. 2 (c) is a schematic illustration of corner-shaped dielectric block members and dimension labels that form the cell structure of an embodiment of the present invention;
FIG. 3 is a schematic three-dimensional view of an assembled four-band rejection frequency selective surface according to an embodiment of the present invention;
FIG. 4 is a diagram showing simulation results of transmission coefficients and reflection coefficients of an assembled four-band rejection frequency selective surface according to an embodiment of the present invention when electromagnetic waves are perpendicularly incident;
Fig. 5 shows a frequency response curve of the spliced four-band-stop frequency selective surface under the conditions of electromagnetic wave normal incidence and dual polarization modes;
Fig. 6 (a) is a diagram of simulation results of transmission coefficients of an assembled four-band rejection frequency selective surface under TE polarization mode and different incident angles according to an embodiment of the present invention;
Fig. 6 (b) is a diagram of simulation results of transmission coefficients of the assembled four-band rejection frequency selective surface under TM polarization mode and different incident angles according to an embodiment of the present invention.
In the figure: 1. an outer media cartridge; 2. an inner medium cylinder; 3. a corner-shaped medium block; 21. a circular media cartridge; 22. a strip-shaped medium block; 23. n-type bending metal strips; 24. a first metal fan ring; 31. a dielectric substrate; 32. an L-shaped bent metal strip; 33. a second metal fan ring.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Embodiment one:
An assembled four-frequency band-stop frequency selective surface can be processed and assembled by adopting a three-dimensional printing technology and an electroplating technology. Referring to fig. 1, the assembled four-band-stop frequency selective surface is formed by periodically arranging the unit structures shown in fig. 1 in a two-dimensional plane direction, and the unit structures have symmetry, so that a dual-polarization function can be realized. Each unit structure comprises an outer medium cylinder 1, an inner medium cylinder 2 and four corner-shaped medium blocks 3, wherein the top surface of the inner medium cylinder 2 is in a cross shape, and the unit structure comprises a round medium cylinder 21, four identical strip-shaped medium blocks 22 which are equidistantly distributed on the circumferential side wall of the round medium cylinder 21, n-type bent metal strips 23 positioned on each strip-shaped medium block 22 and a first metal fan ring 24. Each n-type bent metal strip 23 is located at the upper end of the elongated dielectric block 22, and each first metal fan ring 24 is located at the bottom of the elongated dielectric block 22. The corner-shaped dielectric block 3 comprises a dielectric substrate 31, an L-shaped bent metal strip 32 and a second metal fan ring 33, wherein the L-shaped bent metal strip 32 is positioned on the upper surface of the dielectric substrate 31, and the second metal fan ring 33 is positioned on the lower surface of the dielectric substrate 31. By assembling an outer dielectric tube 1, four corner-shaped dielectric blocks 3 and an inner dielectric tube 2 from outside to inside to form a unit structure shown in fig. 1, it should be noted that the ends of the n-type bent metal strips 23 correspond to the heights and positions of the ends of the L-type bent metal strips 32, the four n-type bent metal strips 23 and the four L-type bent metal strips 32 form a three-dimensionally stretched bent metal ring at the upper end of the unit structure, thereby generating a multi-order resonance mode, forming three stop bands, the ends of the first metal fan ring 24 and the second metal fan ring 33 correspond to each other in height and position, the four first metal fan rings 24 and the four second metal fan rings 33 form a metal circular ring at the lower surface of the unit structure, thereby generating another stop band, and finally realizing a four-band-stop frequency selective surface design.
Fig. 2 is a schematic diagram of an assembled four-band-stop frequency selective surface component and a dimension marking according to an embodiment of the present invention, where fig. 2 (a) is an outer medium cylinder, fig. 2 (b) is an inner medium cylinder, and fig. 2 (c) is a corner-shaped medium block. The top surface of the outer medium cylinder is square, the top surface of the inner medium cylinder is cross-shaped, design parameters of the assembled four-frequency band-stop frequency selective surface unit structure provided by the embodiment are that the length p x =16 mm, the width p y =16 mm, the height h=12 mm and the wall thickness d=1 mm of the outer medium cylinder, the outer diameter r 1 =4 mm and the inner diameter r 2 =3 mm of the round medium cylinder, the thickness a=1.5 mm and the width b=3 mm of the strip-shaped medium block, the width w=1 mm and the end ground clearance t=1 mm of the n-shaped bending metal strip, the outer length l=6.25 mm of the medium substrate, the arc length of the arc inner wall of the medium substrate is 4.774mm, and the outer length l 1 =5.25 mm of the L-shaped bending metal strip. The heights of the circular medium cylinder and the strip-shaped medium block are equal to the height of the outer medium cylinder, and the width of the L-shaped bending metal strip is equal to the width of the n-shaped bending metal strip. The arc radius of the arc inner wall of the dielectric substrate is equal to the outer diameter of the circular dielectric cylinder, the inner side length of the dielectric substrate is equal to the width of the long-strip-shaped dielectric block, and the thickness of the dielectric substrate is equal to the ground clearance height of the end part of the n-type bending metal strip. The relative dielectric constants of the inner dielectric cylinder, the corner dielectric block and the outer dielectric cylinder are all 2.8. The inner diameter and the outer diameter of the first metal fan ring are equal to each other and are 5mm and 6mm respectively, the inner arc length and the outer arc length of the first metal fan ring are 1.506mm and 1.504mm respectively, and the inner arc length and the outer arc length of the second metal fan ring are 6.348mm and 7.921mm respectively.
Fig. 3 is a schematic arrangement diagram of the unit structures shown in fig. 1, which are periodically arranged in a two-dimensional plane direction, and only shows 3×3 unit structures, and in practical engineering use, hundreds of unit structures are usually required to be manufactured to ensure that good application effects are achieved.
Fig. 4 is a graph showing simulation results of transmission coefficients and reflection coefficients of the assembled four-band-stop frequency selective surface according to an embodiment of the present invention when electromagnetic waves are perpendicularly incident, and as can be seen from the graph, the frequency response of the embodiment shows a four-band-stop characteristic, which is respectively located at f z1＝2.12GHz,fz2＝4.67GHz,fz3＝6.73GHz,fz4 =8.86 GHz, wherein f z1、fz2 and f z4 are both generated by bending metal ring resonance, and f z3 is generated by metal ring resonance. The electrical dimension of the frequency selective surface cell structure (p x×py x h) is 0.11λ 0×0.11λ0×0.085λ0, where λ 0 is the free space wavelength.
Fig. 5 shows a frequency response curve of the spliced four-band-stop frequency selective surface under the conditions of electromagnetic wave normal incidence and dual polarization modes. The frequency response simulation curves in TE and TM modes are quite identical, which shows that the spliced four-band-stop frequency selective surface provided by the embodiment of the invention has dual polarization performance, and the main reason is that the unit structure of the spliced four-band-stop frequency selective surface has symmetry.
Fig. 6 is a diagram showing simulation results of transmission coefficients of the assembled four-band-stop frequency selective surface according to the embodiment of the present invention in a dual-polarized mode and at different incident angles, where fig. 6 (a) is a TE polarized mode and fig. 6 (b) is a TM polarized mode, and it can be seen from the diagram that, in the TE and TM polarized modes, when an electromagnetic wave is incident at an angle of 0 °,15 °,30 °, the frequency response is stable, so that the assembled four-band-stop frequency selective surface according to the embodiment has good angular stability.
In the design process of the unit structure, the physical perimeter of the metal square ring is increased by carrying out three-dimensional space stretching on the metal square ring resonance unit on the two-dimensional plane by means of the design concept of three-dimensional stretching, the perimeter of the closed loop is greatly increased under the condition that the area of the unit structure is unchanged, thereby generating a multi-order resonance mode, forming three stop bands, simultaneously, the metal circular ring resonance on the lower surface of the unit structure is introduced with one stop band, finally, the design of the four-frequency band-resistance frequency selection surface is realized, the resonant frequency of the unit structure is reduced due to the increase of the perimeter of the closed loop, and the miniaturization design of the frequency selection surface is facilitated, so that the problem that the design freedom degree of the unit structure on the two-dimensional plane is limited is effectively overcome. In addition, the four-band-stop frequency selection surface object provided by the embodiment of the invention can be processed and assembled by adopting a three-dimensional printing technology and an electroplating technology. Compared with the existing four-band-stop frequency selective surface, the spliced four-band-stop frequency selective surface provided by the embodiment has the advantages of high design freedom, dual polarization, good angle stability, smaller electric size and the like.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (5)
1. The assembled four-frequency band-stop frequency selection surface is characterized by being formed by periodically arranging a plurality of unit structures in a two-dimensional plane direction, wherein each unit structure is formed by assembling an inner medium cylinder and four corner-shaped medium blocks and then embedding the unit structures into an outer medium cylinder, n-type bent metal strips stretching towards a three-dimensional space relative to the corner-shaped medium blocks are arranged at the inner medium cylinder, a first metal fan ring is arranged at the bottom of the inner medium cylinder, L-type bent metal strips corresponding to the end parts of the n-type bent metal strips are arranged on the upper surface of the corner-shaped medium blocks, a second metal fan ring corresponding to the end parts of the first metal fan ring is arranged on the lower surface of the corner-shaped medium blocks, the n-type bent metal strips and the L-type bent metal strips form a bent metal ring stretched in a three-dimensional mode, and the first metal fan ring and the second metal fan ring form a metal ring;
The top surface of the inner medium cylinder is cross-shaped and comprises a circular medium cylinder and four strip-shaped medium blocks which are equidistantly distributed on the circumferential side wall of the circular medium cylinder, the n-type bending metal strip is positioned at the upper end of the strip-shaped medium block, and the first metal fan ring is positioned at the bottom of the strip-shaped medium block.
2. The fabricated four-band stop frequency selective surface of claim 1, wherein the inner dielectric cylinder, corner dielectric block and outer dielectric cylinder each have a relative dielectric constant of 2.8.
3. The modular quad band stop frequency selective surface of claim 1 wherein the circular dielectric cylinder, elongated dielectric block and outer dielectric cylinder are of equal height and the L-bend metal strips are of equal width as the n-bend metal strips.
4. The modular quad band stop frequency selective surface of claim 1 wherein said corner shaped dielectric blocks have arcuate inner walls of the same radius as the radius of the arc of the circular dielectric cylinder and the spacing between adjacent corner shaped dielectric blocks is equal to the width of the elongated dielectric blocks.
5. The modular quad band stop frequency selective surface of claim 1 wherein said outer dielectric cylinder top surface is square and the outer dielectric cylinder length and width are equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210673119.XA CN114899615B (en) | 2022-06-15 | 2022-06-15 | Assembled four-frequency band-stop frequency selection surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210673119.XA CN114899615B (en) | 2022-06-15 | 2022-06-15 | Assembled four-frequency band-stop frequency selection surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114899615A CN114899615A (en) | 2022-08-12 |
| CN114899615B true CN114899615B (en) | 2024-04-19 |
Family
ID=82727943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210673119.XA Active CN114899615B (en) | 2022-06-15 | 2022-06-15 | Assembled four-frequency band-stop frequency selection surface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114899615B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108615976A (en) * | 2018-06-15 | 2018-10-02 | 西安电子科技大学 | The restructural frequency-selective surfaces of dual-passband/Wide stop bands based on radome |
| CN108767482A (en) * | 2018-04-02 | 2018-11-06 | 西安理工大学 | A kind of frequency-selective surfaces structure applied to ultra-wideband antenna |
| CN110676592A (en) * | 2019-11-04 | 2020-01-10 | 淮安信息职业技术学院 | Dual-polarized three-order band-pass three-dimensional frequency selection surface |
| CN110690577A (en) * | 2019-09-17 | 2020-01-14 | 淮安信息职业技术学院 | Dual-polarization band-pass three-dimensional frequency selection surface with bilateral steep drop characteristic |
| CN111817011A (en) * | 2020-07-15 | 2020-10-23 | 江苏电子信息职业学院 | Narrow-band-pass frequency selection surface |
| CN111817016A (en) * | 2020-08-13 | 2020-10-23 | 金陵科技学院 | Miniaturized low-profile frequency selective surface |
| CN112332109A (en) * | 2020-10-22 | 2021-02-05 | 西安电子科技大学 | Broadband wave-transmitting type frequency selective wave absorber based on 2.5D structure |
-
2022
- 2022-06-15 CN CN202210673119.XA patent/CN114899615B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767482A (en) * | 2018-04-02 | 2018-11-06 | 西安理工大学 | A kind of frequency-selective surfaces structure applied to ultra-wideband antenna |
| CN108615976A (en) * | 2018-06-15 | 2018-10-02 | 西安电子科技大学 | The restructural frequency-selective surfaces of dual-passband/Wide stop bands based on radome |
| CN110690577A (en) * | 2019-09-17 | 2020-01-14 | 淮安信息职业技术学院 | Dual-polarization band-pass three-dimensional frequency selection surface with bilateral steep drop characteristic |
| CN110676592A (en) * | 2019-11-04 | 2020-01-10 | 淮安信息职业技术学院 | Dual-polarized three-order band-pass three-dimensional frequency selection surface |
| CN111817011A (en) * | 2020-07-15 | 2020-10-23 | 江苏电子信息职业学院 | Narrow-band-pass frequency selection surface |
| CN111817016A (en) * | 2020-08-13 | 2020-10-23 | 金陵科技学院 | Miniaturized low-profile frequency selective surface |
| CN112332109A (en) * | 2020-10-22 | 2021-02-05 | 西安电子科技大学 | Broadband wave-transmitting type frequency selective wave absorber based on 2.5D structure |
Non-Patent Citations (2)
| Title |
|---|
| 于正永.高性能三维频率选择表面的设计及特性研究.2021,1-129页. * |
| 钱建波，朱建平，董进.电磁场与微波/一种高选择性三阶带通三维频率选择表面.2021,第第4卷卷(第第52期期),645-650页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114899615A (en) | 2022-08-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10784574B2 (en) | Antenna | |
| Katoch et al. | Design and analysis of single sided modified square loop UWB frequency selective surface | |
| CN109193167B (en) | Miniaturized frequency selective surface with low ratio of high resonance point to low resonance point | |
| Zhang et al. | Dual-band dual-polarized quasi-elliptic frequency selective surfaces | |
| Lv et al. | Wide-passband dual-polarized elliptic frequency selective surface | |
| CN110690577A (en) | Dual-polarization band-pass three-dimensional frequency selection surface with bilateral steep drop characteristic | |
| CN110676592B (en) | Dual-polarized three-order band-pass three-dimensional frequency selection surface | |
| Luo et al. | Dualband frequency-selective surfaces using substrate-integrated waveguide technology | |
| CN114267958A (en) | Low-pass absorption type frequency selection structure with narrow transition band | |
| CN111541044A (en) | Dual-polarized three-passband three-dimensional frequency selection surface | |
| KR101756816B1 (en) | Scalable frequency selective surface with miniaturized unit cell | |
| CN114899615B (en) | Assembled four-frequency band-stop frequency selection surface | |
| Bing-yuan et al. | Ultra-wideband frequency selective surface at K and Ka band | |
| Mannaa et al. | New dual-band frequency selective surface for GSM shielding in secure-electromagnatic buildings using square loop fractal configurations | |
| Abdalla | Experimental verification of a triple band thin radar absorber metamaterial for oblique incidence applications | |
| Luo et al. | Frequency-selective surfaces with two sharp sidebands realised by cascading and shunting substrate integrated waveguide cavities | |
| CN113131223B (en) | Electromagnetic wave absorber with dual polarization and double absorption bands | |
| CN114843725A (en) | Ultra-wideband large-angle band-stop type frequency selection surface | |
| Payne et al. | Highly-selective miniaturized first-order low-profile dual-band frequency selective surface | |
| WO2019024354A1 (en) | Frequency selective surface structure | |
| WO2021009893A1 (en) | Frequency selective surface | |
| Pae et al. | Analysis and design of a single layer double square slot frequency selective surface with single stopband between double passbands | |
| Li et al. | Three-dimensional bandpass frequency selective structures | |
| Katoch et al. | Band notched polarization insensitive simple FSS for electromagnetic shielding | |
| CN111009734B (en) | Dual-frequency FSS with closely spaced frequency response characteristics and unit structure thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |