CN114843725B - Ultra-wideband wide-angle band-stop type frequency selective surface - Google Patents
Ultra-wideband wide-angle band-stop type frequency selective surface Download PDFInfo
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- CN114843725B CN114843725B CN202210527780.XA CN202210527780A CN114843725B CN 114843725 B CN114843725 B CN 114843725B CN 202210527780 A CN202210527780 A CN 202210527780A CN 114843725 B CN114843725 B CN 114843725B
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- 239000002184 metal Substances 0.000 claims abstract description 106
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- 230000005672 electromagnetic field Effects 0.000 abstract description 2
- 230000000737 periodic effect Effects 0.000 abstract 1
- 238000013461 design Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 238000005452 bending Methods 0.000 description 5
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- 239000003990 capacitor Substances 0.000 description 2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
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Abstract
The invention discloses an ultra-wideband large-angle band-stop type frequency selective 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 the unit structures comprise a dielectric substrate, five metalized through holes and three layers of metal strips, the three layers of metal strips comprise two layers of H-shaped metal strips and one layer of S-shaped metal strips, and the three layers of metal strips comprise two layers of H-shaped metal strips and one layer of S-shaped metal strips, wherein the three layers of metal strips are formed by the two layers of metal strips, namely the three layers of metal strips, the two layers of metal strips are formed by the two layers of metal strips, and the three layers of metal strips are formed by the two layers of metal strips, namely the metal strips and the metal strips, the metal strips and the metal strips in the unit structures are formed by the unit structures in the structure in the mode of periodic structure and are: the two layers of H-shaped metal strips are respectively positioned on the upper surface and the lower surface of the medium substrate, and the H-shaped metal strips on the lower surface of the medium substrate are positioned at the positions where the H-shaped metal strips on the upper surface project on the lower surface and horizontally rotate by 90 degrees along the center of the strips; the five metalized through holes are respectively positioned at the four corners and the center of the dielectric substrate, and the upper ends and the lower ends of the five metalized through holes are respectively connected with the four ends and the center of the H-shaped metal strips on the upper surface and the lower surface of the dielectric substrate. The invention realizes stable frequency response under large incidence angle, and has ultra-wideband characteristic and smaller electric size.
Description
Technical Field
The invention relates to an ultra-wideband wide-angle band-stop type frequency selective surface, and belongs to the technical field of electromagnetic fields and microwaves.
Background
The frequency selective surface (Frequency Selective Surface, FSS) is typically a two-dimensional metal patch or aperture array structure arranged periodically, and may exhibit total reflection (patch type) or total transmission characteristics (aperture type) around the unit resonant frequency when irradiated with electromagnetic waves of different frequencies, exhibiting band-stop or band-pass filtering characteristics, respectively. FSS is widely used in various microwave and millimeter wave systems due to its superior spatial filtering characteristics. The FSS with the band-stop characteristic can be applied to the fields of radomes, antenna auxiliary reflectors, wave absorbing materials, electromagnetic shielding and the like. For traditional FSS, the frequency response of the FSS is very sensitive to the incident angle of electromagnetic waves, and more transmission zero points cannot be introduced due to the limitation of a resonance mechanism, so that only a narrow working bandwidth can be realized. However, in some practical application scenarios, the FSS requirement for broadband, high-angle stability is urgent.
Many documents propose a series of two-dimensional single-frequency or multi-band blocking FSS based on different resonance units such as jersey cooling cross, circular ring, square ring and Y-shaped, and although many developments and achievements are made in the aspects of working bandwidth, angle stability, miniaturization, small passband ratio and the like, the ultra-wideband performance and the large angle stability are difficult to realize at the same time, and the application range of the FSS is affected to a certain extent. Later, the university of southern ken, singapore, shen Zhongxiang and the like put forward a band-stop type FSS design method based on a three-dimensional unit structure, compared with two-dimensional FSS, the three-dimensional FSS has one more design dimension and higher freedom degree, a plurality of resonance modes can be constructed, a plurality of transmission zero poles are introduced, the working bandwidth of the FSS can be well expanded, however, the three-dimensional FSS has higher difficulty in processing and assembling links, and particularly the FSS applied to the high-frequency field cannot meet the requirement of design precision due to smaller size of the unit structure. Therefore, in order to address the above-mentioned shortcomings, it is necessary to design a band-stop type frequency selective surface with ultra-wideband and large-angle stability.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an ultra-wideband large-angle band-stop type frequency selective surface which realizes stable frequency response under a large incident angle and has ultra-wideband characteristics and smaller electric size.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the invention provides an ultra-wideband large-angle band-stop type frequency selective surface, which is formed by periodically arranging a plurality of unit structures in a two-dimensional plane direction, wherein the unit structures comprise a dielectric substrate, five metalized through holes and three layers of metal strips, the three layers of metal strips comprise two layers of H-shaped metal strips and one layer of S-shaped metal strips, and the three layers of metal strips comprise two layers of H-shaped metal strips and one layer of S-shaped metal strips, wherein the two layers of metal strips are arranged in a staggered manner, and the three layers of metal strips are arranged in the same plane direction:
the two layers of H-shaped metal strips are respectively positioned on the upper surface and the lower surface of the medium substrate, and the H-shaped metal strips on the lower surface of the medium substrate are positioned at the positions where the H-shaped metal strips on the upper surface project on the lower surface and horizontally rotate by 90 degrees along the center of the strips;
the upper ends and the lower ends of the five metallized through holes are respectively connected with the four ends and the center of the H-shaped metal strips on the upper surface and the lower surface of the dielectric substrate;
the S-shaped metal strip is positioned between the upper surface and the lower surface of the dielectric substrate and is sequentially connected with three metalized through holes distributed along the diagonal of the surface of the dielectric substrate;
and the ends of the metal strips are welded with the metalized through holes through circular ring bonding pads.
Further, the H-shaped metal strip comprises two T-shaped metal strips, and the convex ends of the two T-shaped metal strips are welded through a circular ring bonding pad.
Further, the side length of the dielectric substrate is 5mm, the height of the dielectric substrate is 1.6mm, the width of the H-shaped metal strip is 0.15mm, the outer diameter of the circular ring bonding pad is 0.35mm, the inner diameter of the circular ring bonding pad is 0.2mm, and the spacing between the circular ring bonding pad and the side is 0.05mm.
Further, the distance between the layer where the S-shaped metal strip is located and the lower surface of the dielectric substrate is 0.6mm.
Further, the S-shaped metal strip comprises two bending metal strips which are connected through a circular ring bonding pad and distributed in a central symmetry mode, each bending metal strip comprises seven sections of metal strips, one section to seven sections of metal strips gradually approach to a metalized through hole positioned at the center, the strip lengths of one section to seven sections of metal strips are 3.325mm, 3mm, 2.7mm, 2.1mm, 1.5mm, 1mm and 0.325mm respectively, and the distances between adjacent sections of metal strips are all 0.15mm.
Furthermore, the ultra-wideband large-angle band-stop type frequency selective surface is manufactured by a printed circuit board.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the ultra-wideband large-angle band-stop type frequency selective surface, in the design process of a unit structure, the actual length of a metal strip is increased through bending operation, more frequency multiplication resonance points are generated in the same frequency range, more resonance modes are introduced through loading a bent metal strip structure between the upper surface and the lower surface of a dielectric substrate, and more transmission zero points are generated, so that the working bandwidth is expanded;
2. the invention connects three layers of metal surfaces through the metallized through holes, the metallized through holes are equivalent to an inductor, obviously, a large inductor is provided for the frequency selective surface unit structure, and meanwhile, the metallized through holes of adjacent unit structures can be equivalent to a gap capacitor, thereby effectively increasing the capacitance of the frequency selective surface unit structure. The inductance and the capacitance of the frequency selective surface unit structure are increased by introducing a plurality of metalized through holes, the band-stop characteristic of the frequency selective surface is realized by a series resonance mechanism based on the capacitance and the inductance, and in addition, the resonance frequency is reduced by the larger inductance and the capacitance, so that the electric size of the unit structure is reduced, the miniaturization design of the frequency selective surface is realized, and the sensitivity of the frequency selective surface to the incident angle of electromagnetic waves is reduced.
Drawings
FIG. 1 is a schematic three-dimensional diagram of a unit structure of an ultra wideband large angle bandstop type FSS according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a unit structure side view and a dimension marking of an ultra wideband large angle band stop type FSS according to an embodiment of the present invention;
FIG. 3 (a) is a schematic diagram of the upper surface of a dielectric substrate constituting a unit structure according to a first embodiment of the present invention;
FIG. 3 (b) is a schematic diagram of an intermediate layer of a dielectric substrate constituting a unit structure according to a first embodiment of the present invention;
FIG. 3 (c) is a schematic view of the lower surface of a dielectric substrate forming a unit structure according to a first embodiment of the present invention;
FIG. 4 is a three-dimensional schematic diagram of an ultra wideband large angle bandstop FSS according to an embodiment of the present invention;
FIG. 5 is a diagram showing simulation results of transmission coefficients and reflection coefficients of an ultra wideband large angle band stop type FSS according to an embodiment of the present invention when electromagnetic waves are perpendicularly incident;
fig. 6 is a diagram of transmission coefficient simulation results of an ultra wideband large angle bandstop FSS according to an embodiment of the present invention under different incident angles.
In the figure: 1. a dielectric substrate; 2. a "T" shaped metal strip; 3. bending the metal strip; 4. a circular ring bonding pad; 5. and metallizing the through holes.
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 ultra-wideband large-angle band-stop frequency selective surface can be manufactured by adopting a Printed circuit board (Printed CircuitBoard, PCB) processing technology, and is simple in technology, referring to fig. 1, the ultra-wideband large-angle band-stop frequency selective surface is formed by periodically arranging unit structures shown in fig. 1 in a two-dimensional plane direction, the unit structure is easy to design and low in cost, each unit structure comprises a dielectric substrate 1, an H-shaped metal strip is arranged on the upper surface and the lower surface of the dielectric substrate 1, the H-shaped metal strip on the lower surface is positioned at the position where the H-shaped metal strip on the upper surface projects on the lower surface and horizontally rotates by 90 degrees along the center of the strip, an S-shaped metal strip is arranged between the upper surface and the lower surface of the dielectric substrate 1, the H-shaped metal strips on the upper surface and the lower surface are connected through metallized through holes 5, one metallized through hole 5 is positioned at the center of the dielectric substrate 1, and the other four metallized through holes 5 are positioned at four corners of the dielectric substrate 1. Each H-shaped metal strip consists of two identical T-shaped metal strips 2 and five identical circular ring bonding pads 4, wherein the two T-shaped metal strips 2 positioned on the upper/lower surfaces of the medium substrate 1 are distributed in a central symmetry mode, and the circular ring bonding pads 4 are connected to each end of the T-shaped metal strips. The S-shaped metal strip consists of two identical bent metal strips 3 and three identical circular ring bonding pads 4, wherein the two bent metal strips 3 are distributed in a central symmetry mode, and the circular ring bonding pads 4 are connected to each end of the bent metal strips 3. Each circular ring pad 4 is soldered with a corresponding metallized via 5.
Please refer to fig. 2,h, h, which is a height of the dielectric substrate 1 Is the distance between the S-shaped metal strip layer and the lower surface of the medium substrate.
Please refer to fig. 3 (a) - (c), wherein: p is the side length of the dielectric substrate, w is the width of the H-shaped metal strip, s is the spacing between the annular bonding pads and the side, and r 1 Is the outer diameter of a circular ring bonding pad, r 2 Is the inner diameter of the circular ring bonding pad, l 1 Is an S-shaped metal strip with a length l 2 Is an S-shaped metal strip with two sections of strip length, l 3 Is the three sections of the S-shaped metal strip with length l 4 Is the length of four sections of S-shaped metal strips, l 5 Is the length of five sections of S-shaped metal strips, l 6 Is the length of six sections of S-shaped metal strips, l 7 Is of seven sections of strip length S of S-shaped metal strip 1 Is an S-shaped metal strip with a two-section interval S 2 Is the spacing of two sections and three sections of S-shaped metal strips, S 3 Is the space between three and four sections of S-shaped metal strips, S 4 Is the space between four and five sections of S-shaped metal strips, S 5 Is the spacing of five and six sections of S-shaped metal strips.
Referring to fig. 4, fig. 4 is a schematic diagram showing the arrangement of the unit structures shown in fig. 1 periodically in the two-dimensional plane direction, and only 4×4 unit structures are shown, in practical application, hundreds of unit structures are usually required to be fabricated.
Referring to fig. 5, the design parameters of the cell structure are p=5 mm, h=1.6mm, h 1 ＝0.6mm,w＝0.15mm,s＝0.05mm,r 1 ＝0.35mm,r 2 ＝0.2mm,l 1 ＝3.325mm,l 2 ＝3mm,l 3 ＝2.7mm,l 4 ＝2.1mm,l 5 ＝1.5mm,l 6 ＝1mm,l 7 ＝0.325mm,s 1 ＝s 2 ＝s 3 ＝s 4 ＝s 5 The relative permittivity of the dielectric substrate was 4.4, =0.15 mm. As can be seen, the frequency response of the present embodiment exhibits a band-stop characteristic with a center frequency at 10.15GHz, a 10dB operating bandwidth of 11.1GHz (4.6 GHz-15.7 GHz), and a Relative Bandwidth (RBW) 10dB ) 109.4%, the electrical dimension of the cell structure (pXpXh) was 0.169. Lambda 0 ×0.169λ 0 ×0.054λ 0 (λ 0 Is free space wavelength) and therefore the band-stop type frequency selective surface proposed by the present embodiment has ultra-wideband characteristics and a small electrical size.
Referring to fig. 6, when the electromagnetic wave is incident at an angle of 0 °,30 °,60 °,80 °, the frequency response is very stable, so the band-stop type frequency selective surface according to the present embodiment has a large angular stability and low sensitivity to the incident angle of the electromagnetic wave.
In the design process of the unit structure, the actual length of the metal strip is increased through bending operation, more frequency doubling resonance points are generated in the same frequency range, more resonance modes are introduced by loading the bent metal strip structure between the upper surface and the lower surface of the dielectric substrate, and more transmission zero points are generated, so that the working bandwidth is expanded, and the-10 dB relative bandwidth of the unit structure is up to 109.4%. The three layers of metal surfaces are connected through the metallized through holes, the metallized through holes are equivalent to an inductor, and obviously, a large inductor is provided for the frequency selective surface unit structure, and meanwhile, the metallized through holes of the adjacent unit structures can be equivalent to a gap capacitor, so that the capacitance of the frequency selective surface unit structure is effectively increased. The inductance and the capacitance of the frequency selective surface unit structure are increased by introducing a plurality of metalized through holes, the band-stop characteristic of the frequency selective surface is realized based on a series resonance mechanism of the capacitance and the inductance, in addition, the resonance frequency is reduced due to the larger inductance and capacitance, so that the electric size of the unit structure is reduced, the miniaturization design of the frequency selective surface is realized, the sensitivity of the frequency selective surface to the incident angle of electromagnetic waves is reduced, and the angle stability of the embodiment reaches 80 degrees. In summary, compared with the existing band-stop type frequency selective surface, the band-stop type frequency selective surface provided by the embodiment has the advantages of ultra-wideband, large-angle stability, smaller electrical 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 (6)
1. The ultra-wideband wide-angle band-stop type frequency selective surface is characterized by being formed by periodically arranging a plurality of unit structures in a two-dimensional plane direction, wherein the unit structures comprise a dielectric substrate, five metalized through holes and three layers of metal strips, and the three layers of metal strips comprise two layers of "HMetal strip and layer "S"metal strip, wherein:
two-layer'HThe metal strips are respectively arranged on the upper surface and the lower surface of the dielectric substrate, and the lower surface of the dielectric substrate "HMetal strip on top surface "H"the metal strip is projected on the lower surface and rotated 90 degrees horizontally along the center of the strip;
five metallized through holes are respectively positioned at the four corners and the center of the dielectric substrate, and the upper ends and the lower ends of the five metallized through holes are respectively connected with the upper surface and the lower surface of the dielectric substrate "HFour ends and of metal stripA center;
“Sthe metal strips are positioned between the upper surface and the lower surface of the medium substrate and are sequentially connected with three metallized through holes distributed along the diagonal line of the surface of the medium substrate;
the ends of the metal strips are welded with the metallized through holes through circular ring bonding pads;
“Sthe metal strip is composed of two identical bent metal strips (3) and three identical circular ring bonding pads (4).
2. The ultra-wideband wide angle bandstop type frequency selective surface according to claim 1, wherein said "HThe "metal strip comprises two"T"Metal strips, and two"TThe convex ends of the metal strips are welded through circular ring bonding pads.
3. The ultra-wideband wide angle bandstop type frequency selective surface according to claim 1, wherein said dielectric substrate has a side length of 5mmAnd a height of 1.6mmThe said'H"Metal strip width 0.15mmThe outer diameter of the circular ring bonding pad is 0.35mmAnd an inner diameter of 0.2mmAnd the spacing between the circular ring bonding pads and the edge is 0.05mm。
4. The ultra-wideband wide angle bandstop type frequency selective surface according to claim 1, wherein said "SThe distance between the layer where the metal strip is positioned and the lower surface of the dielectric substrate is 0.6mm。
5. The ultra-wideband wide angle bandstop type frequency selective surface according to claim 1, wherein said "SThe metal strips comprise two bent metal strips which are connected through circular ring bonding pads and distributed in a central symmetry manner, each bent metal strip comprises seven sections of metal strips, one section to seven sections are gradually close to a metalized through hole positioned at the center, and the strip lengths of one section to seven sections of metal strips are respectively 3.325mm、3mm、2.7mm、2.1mm、1.5mm、1mmAnd 0.325 ofmmAnd (2) andthe spacing between adjacent sections of metal strips is 0.15mm。
6. The ultra-wideband wide angle band stop type frequency selective surface according to any one of claims 1-5, wherein the ultra-wideband wide angle band stop type frequency selective surface is manufactured by printed circuit board processing.
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Application publication date: 20220802 Assignee: Nanjing Huahe Semiconductor Technology Co.,Ltd. Assignor: Jiangsu electronic information Vocational College Contract record no.: X2023980050078 Denomination of invention: A Ultra Wideband Large Angle Bandstop Frequency Selective Surface Granted publication date: 20231103 License type: Common License Record date: 20231206 |