CN110676592A - Dual-polarized three-order band-pass three-dimensional frequency selection surface - Google Patents

Dual-polarized three-order band-pass three-dimensional frequency selection surface Download PDF

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CN110676592A
CN110676592A CN201911110799.9A CN201911110799A CN110676592A CN 110676592 A CN110676592 A CN 110676592A CN 201911110799 A CN201911110799 A CN 201911110799A CN 110676592 A CN110676592 A CN 110676592A
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dual
metal square
band
polarized
square
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CN110676592B (en
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于正永
倪春美
董进
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Jiangsu Vocational College of Electronics and Information
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Huaian Vocational College of Information Technology
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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
    • 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
    • H01Q15/24—Polarising devices; Polarisation filters 

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Abstract

The invention discloses a dual-polarized three-order band-pass three-dimensional frequency selection surface. The frequency selective surface is composed of a plurality of same unit structures which are periodically arranged, and each unit structure comprises a metal square cylinder and a medium square. And a metal square ring is etched at the central positions of the upper surface, the middle layer and the lower surface of the dielectric square block. The metal square rings on the upper surface and the lower surface of the medium square block are the same in size, and the circumferences of the two metal square rings are larger than those of the metal square ring in the middle layer. Two transmission poles are generated due to electromagnetic coupling between the resonant units on the upper surface and the lower surface of the unit structure; and the metal square ring, the metal square cylinder and the dielectric square block of the middle layer act together to form a third transmission pole, so that a flat third-order pass band is formed. Because the signal phase is reversely offset, three transmission zeros are introduced, so that the dual-polarization antenna has high frequency selectivity and wide out-of-band rejection, and has good angle stability in a dual-polarization working mode.

Description

Dual-polarized three-order band-pass three-dimensional frequency selection surface
Technical Field
The invention belongs to the technical field of electromagnetic fields and microwaves, and particularly relates to a dual-polarized three-order band-pass three-dimensional frequency selection surface.
Background
Frequency Selective Surface (FSS) has been widely used in various microwave and millimeter wave systems for the past few decades due to its superior spatial filtering characteristics. FSS is typically a two-dimensional array of periodically arranged metallic cell structures that can implement a bandpass or bandstop filter response. Bandpass FSS requires a flat transmission response and low insertion loss in the passband, while having high frequency selectivity and wide out-of-band rejection in the out-of-band, in addition to good angular stability, dual polarization, and small electrical size.
The traditional second-order band-pass two-dimensional FSS can be realized by means of multilayer stacked coupling and the like, but the problems of poor frequency selectivity, uneven pass band, narrow out-of-band rejection bandwidth, large electrical size and the like often occur. Subsequently, a Shenzhou Xiang professor team of the Nanyang university of Singapore proposes a series of second-order bandpass three-dimensional frequency selection surface structures based on shielding microstrip lines, the problems are effectively improved, but the structures can only realize single polarization, and the practical application of the structures is limited to a great extent. Later, by loading a non-resonant unit on an intermediate layer of a multilayer structure, a plurality of scholars generate three or more transmission poles by utilizing the electromagnetic coupling effect of the multilayer resonant unit, so that a third-order or high-order band-pass FSS is realized, the flatness of a pass band is improved, but the third-order or high-order band-pass FSS can only introduce a single transmission zero on one side of the pass band or respectively introduce one transmission zero on two sides of the pass band, the frequency selectivity is improved to a certain extent, but wide out-of-band suppression is difficult to realize. Therefore, in order to overcome the above defects, it is necessary to design a dual-polarized three-order bandpass three-dimensional FSS with wide out-of-band rejection.
Disclosure of Invention
The invention provides a dual-polarization third-order bandpass three-dimensional frequency selection surface, which realizes stable frequency response under different polarizations and different incidence angles, and has a flat third-order passband, wide out-of-band rejection and smaller electrical size.
The invention provides a dual-polarized three-order band-pass three-dimensional frequency selection surface which is formed by periodically arranging a plurality of same unit structures, wherein each unit structure comprises a metal square tube and a dielectric square. And a metal square ring is etched at the central positions of the upper surface, the middle layer and the lower surface of the dielectric square block. The metal square rings on the upper surface and the lower surface of the medium square block are the same in size, and the circumferences of the two metal square rings are larger than those of the metal square ring in the middle layer.
According to the dual-polarization three-order band-pass three-dimensional frequency selection surface provided by the invention, two transmission poles are generated due to electromagnetic coupling between the resonance units on the upper surface and the lower surface of the unit structure; and the metal square ring, the metal square cylinder and the dielectric square block of the middle layer act together to form a third transmission pole, so that a flat third-order pass band is formed. Because the signal phase is reversely offset, three transmission zeros are introduced, so that the invention has high frequency selectivity and wide out-of-band rejection. The dual polarization is realized due to the symmetry of the unit structure; meanwhile, under the dual-polarization working mode, the dual-polarization LED lamp has good angle stability when the light is incident at angles of 0 degrees, 30 degrees and 50 degrees. Compared with the existing band-pass FSS, the frequency selective surface has the advantages of dual polarization, flat third-order pass band, high frequency selectivity, wide out-of-band rejection, good angular stability, smaller electrical size and the like.
Drawings
Fig. 1 is a three-dimensional schematic diagram of a unit structure of a dual-polarized third-order bandpass three-dimensional frequency selective surface according to the present invention.
FIG. 2 is a schematic diagram of the components that make up the cell structure of the present invention (a) a metal square cylinder; (b) and (5) a medium square block.
FIG. 3 is a perspective view of a unit structure dimension labeling schematic diagram (a) and parameter labeling of a dual-polarized third-order bandpass three-dimensional frequency selection surface according to the present invention; (b) top view and parameter labels.
Fig. 4 is a three-dimensional schematic diagram of a dual-polarized third-order bandpass three-dimensional frequency selective surface according to the present invention.
Fig. 5 is a simulation result diagram of transmission coefficients and reflection coefficients of the dual-polarized third-order bandpass three-dimensional frequency selective surface provided by the invention when electromagnetic waves are vertically incident.
Fig. 6 is a transmission coefficient simulation result graph (a) of the dual-polarized third-order bandpass three-dimensional frequency selective surface provided by the invention under different incident angles; (b) the TM mode.
Detailed Description
For the purpose of explaining the technical solution disclosed in the present invention in detail, the following description is further made with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a three-dimensional schematic diagram of a unit structure of a dual-polarized third-order bandpass three-dimensional frequency selective surface according to the present invention. Each unit structure comprises a metal square tube 1 and a medium square 2. The upper surface and the lower surface of the unit structure form a resonance unit consisting of a metal square ring and the upper end surface of a metal square cylinder.
Figure 2 shows a schematic of the components making up the cell structure of the present invention. FIG. 2(a) shows a metal square tube 1; FIG. 2(b) shows a dielectric block 2. And etching a metal square ring 21, a metal square ring 22 and a metal square ring 23 at the central positions of the upper surface, the middle layer and the lower surface of the dielectric square 2 respectively. The metal square ring 21 and the metal square ring 23 have the same size, and the circumference of the two metal square rings is larger than that of the metal square ring 22 in the middle layer.
Fig. 3 is a schematic diagram illustrating dimension labeling of a unit structure of a dual-polarized third-order bandpass three-dimensional frequency selective surface according to the present invention. Design parameter dx＝dy＝11.4mm，l1＝8.5mm，l2＝7.1mm，w1＝w20.2mm, 10mm, 0.5mm, and the dielectric relative dielectric constant of the dielectric square is 3.5.
Fig. 4 is a three-dimensional schematic diagram of a dual-polarized third-order bandpass three-dimensional frequency selective surface according to the present invention, which is formed by the unit structures shown in fig. 1 periodically arranged in a two-dimensional plane direction. Fig. 4 only shows an arrangement diagram of 4 × 4 unit structures, and in practice, hundreds of unit structures are usually required to be manufactured during processing and testing.
FIG. 5 is a simulation curve of transmission coefficient and reflection coefficient when electromagnetic waves are vertically incident. As can be seen, the three transmission poles are respectively located at fp1＝5.46GHz、fp25.74GHz and fp35.87GHz, a flat third-order pass band is formed, the center frequency of the pass band is 5.605GHz, and the Relative Bandwidth (RBW) of the pass band is 3dB3dB) The content was 10.9%. Furthermore, three transmission zero points generated outside the band are respectively located at fz1＝6.08GHz、fz26.35GHz and fz3The frequency selectivity is improved when the frequency is 7.1 GHz; the suppression depth reaches below-20 dB in the frequency range of 5.99GHz-8.69GHz, and the Relative Bandwidth (RBW) of the stop band is 20dB20dB) Is 48.2 percent; electrical size (d) of its unit structurex×dyX h) is 0.21 lambda0×0.21λ0×0.187λ0(λ0Free space wavelength). Thus, the frequency selective surface has a flat third order passband, high frequency selectivity, wide out-of-band rejection, and small electrical size.
Fig. 6(a) and fig. 6(b) are transmission coefficient simulation curves corresponding to different incident angles in two polarization modes of TE and TM, respectively. As can be seen from the figure, under two polarization modes of TE and TM, the electromagnetic wave has better angle stability when being incident at angles of 0 degrees, 30 degrees and 50 degrees, and the invention is fully proved to have better practicability.
The invention discloses a dual-polarized three-order band-pass three-dimensional frequency selection surface. The frequency selective surface is composed of a plurality of same unit structures which are periodically arranged, and each unit structure comprises a metal square cylinder and a medium square. And a metal square ring is etched at the central positions of the upper surface, the middle layer and the lower surface of the dielectric square block. The metal square rings on the upper surface and the lower surface of the medium square block are the same in size, and the circumferences of the two metal square rings are larger than those of the metal square ring in the middle layer. Two transmission poles are generated due to electromagnetic coupling between the resonant units on the upper surface and the lower surface of the unit structure; and the metal square ring, the metal square cylinder and the dielectric square block of the middle layer act together to form a third transmission pole, so that a flat third-order pass band is formed. Because the signal phase is reversely offset, three transmission zeros are introduced, so that the invention has high frequency selectivity and wide out-of-band rejection; the dual polarization is realized due to the symmetry of the unit structure; meanwhile, under the dual-polarization working mode, the dual-polarization LED lamp has good angle stability when the light is incident at angles of 0 degrees, 30 degrees and 50 degrees. Compared with the existing band-pass FSS, the frequency selective surface has the advantages of dual polarization, flat third-order pass band, high frequency selectivity, wide out-of-band rejection, good angular stability, smaller electrical size and the like.

Claims (4)

1. A dual-polarized three-order band-pass three-dimensional frequency selection surface is formed by periodically arranging a plurality of same unit structures and is characterized in that each unit structure is composed of a metal square tube and a medium square block.
2. The dual-polarized third-order bandpass three-dimensional frequency selective surface according to claim 1, wherein a metal square ring is etched at the center of each of the upper surface, the middle layer and the lower surface of the dielectric square.
3. The dual polarized third order bandpass three dimensional frequency selective surface of claim 2, wherein the metal square rings of the upper and lower surfaces of the dielectric squares are the same size.
4. The dual polarized third order bandpass three dimensional frequency selective surface of claim 2, wherein the metal square ring perimeter of the upper and lower surfaces of the dielectric squares is larger than the metal square ring perimeter of the middle layer.
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Cited By (3)

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CN111541044A (en) * 2020-05-13 2020-08-14 淮安信息职业技术学院 Dual-polarized three-passband three-dimensional frequency selection surface
CN111628294A (en) * 2020-05-13 2020-09-04 淮安信息职业技术学院 Three-passband frequency selection surface with high selectivity and small passband ratio
CN114899615A (en) * 2022-06-15 2022-08-12 江苏电子信息职业学院 Assembled four-band-stop frequency selection surface

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN111541044A (en) * 2020-05-13 2020-08-14 淮安信息职业技术学院 Dual-polarized three-passband three-dimensional frequency selection surface
CN111628294A (en) * 2020-05-13 2020-09-04 淮安信息职业技术学院 Three-passband frequency selection surface with high selectivity and small passband ratio
CN114899615A (en) * 2022-06-15 2022-08-12 江苏电子信息职业学院 Assembled four-band-stop frequency selection surface
CN114899615B (en) * 2022-06-15 2024-04-19 江苏电子信息职业学院 Assembled four-frequency band-stop frequency selection surface

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