CN115133288B - Multiband frequency selective surface structure and signal receiving apparatus - Google Patents
Multiband frequency selective surface structure and signal receiving apparatus Download PDFInfo
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- CN115133288B CN115133288B CN202211037425.0A CN202211037425A CN115133288B CN 115133288 B CN115133288 B CN 115133288B CN 202211037425 A CN202211037425 A CN 202211037425A CN 115133288 B CN115133288 B CN 115133288B
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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
- H01Q15/0026—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 said selective devices having a stacked geometry or having multiple layers
Abstract
The invention relates to the technical field of electromagnetic waves and microwaves and discloses a multiband frequency selection surface structure and signal receiving equipment. The embodiment of the application utilizes the unit zigzag technology to tightly fill the units, effectively increases the resonance length and realizes the miniaturization of the unit structure. The multiband frequency selection surface structure utilizes the first metal layer to form two resonant frequency bands, introduces the transmission zero point through the second metal layer, realizes the three-band filtering characteristic, has excellent polarization stability and angle stability, has a simple structure and a small size, and has good application prospects in the fields of multiband antennas, radar antenna covers and the like.
Description
Technical Field
The embodiment of the application relates to the technical field of electromagnetic waves and microwaves, in particular to a multiband frequency selection surface structure and signal receiving equipment.
Background
Frequency Selective Surface (FSS) refers to a one-dimensional or two-dimensional periodic array structure formed by periodically arranging a large number of identical metal patch units or aperture units on a metal screen, has a spatial filtering characteristic, has a Selective transmission or reflection characteristic for electromagnetic waves of different frequencies, and is widely applied to multiple fields such as antenna sub-reflectors, radome, electromagnetic shielding, electromagnetic compatibility and the like. The factors influencing the FSS filter characteristics are many, and mainly include the unit geometry, size, arrangement, array period, dielectric constant, thickness, loading mode of the dielectric substrate, incident angle and polarization mode of the electromagnetic wave, and the like. In practical engineering applications, the frequency selective surface structure is often in an electromagnetic environment with large-angle incidence and different polarization modes, and therefore, the FSS is required to have good incident angle stability and polarization stability, that is, the frequency selective characteristic is kept stable under different incident angles and polarization modes. The stability of the incident angle and the polarization stability are important indexes of FSS research all the time, and the quality of the stability is one of key indexes for judging whether the FSS filter characteristics are good or not.
With the development of multi-frequency communication and multi-frequency detection technology, the research on dual-frequency and multi-frequency band FSS is receiving more and more attention. The general structure of the multiband FSS is complex, the size is large, the processing is difficult, the resonance points are easy to influence each other, and the multiband FSS is easy to be influenced by grating lobes and has poor angle stability. Therefore, it is necessary to design a multiband frequency selective surface structure having excellent angular stability and polarization stability.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the invention provides a multiband frequency selective surface structure.
A second aspect of the present invention provides a signal receiving apparatus.
In view of the above, according to the present application, there is provided a multiband frequency selective surface structure comprising:
a first metal layer on which cross-shaped aperture elements and dipole aperture elements arranged on the peripheral sides of the cross-shaped aperture elements are formed;
the first metal layer is arranged on one side of the dielectric substrate;
and the second metal layer is arranged on the other side of the medium substrate and is opposite to the first metal layer, and a cross patch unit and dipole patch units arranged on the peripheral side of the cross patch unit are formed on the second metal layer.
In a possible implementation manner, one dipole aperture unit is arranged at four included angles of each cross-shaped aperture unit, and each cross-shaped aperture unit and the four dipole aperture units are compounded to form an aperture unit;
the aperture units are multiple, the aperture unit arrays are arranged on the first metal layer, and the dipole aperture units of two adjacent aperture units are communicated;
the four included angles of each cross patch unit are provided with one dipole patch unit, and each cross patch unit and the four dipole patch units are compounded to form a patch unit;
the patch units are multiple, the patch unit arrays are arranged on the second metal layer, and the dipole patch units of two adjacent patch units are communicated;
wherein the aperture unit and the patch unit have a period of 1mm to 20mm.
In a possible implementation mode, the aperture formed by the connection of the dipole aperture units of two adjacent aperture units is obliquely arranged;
and the dipole patch units of two adjacent patch units are communicated to form a patch path which is obliquely arranged.
In one possible embodiment of the method according to the invention,
each dipole aperture unit comprises a plurality of zigzag portions, the zigzag portions are formed by bending the dipole aperture unit for 1 to 20 times, and the zigzag angle of each zigzag portion is 90 degrees;
each dipole patch unit comprises a plurality of bent parts, the bent parts are formed by bending the dipole patch unit for 1 to 20 times, and the bending angle of each bent part is 90 degrees.
In one possible embodiment, the cross-shaped aperture unit includes:
a cross-shaped aperture and a bent aperture formed at an end of the cross-shaped aperture.
In one possible embodiment, the cross aperture element is the same shape and size as the cross patch element, and the dipole aperture element is the same shape and size as the dipole patch element;
the first metal layer and the second metal layer are arranged in parallel, and form a complementary structure;
the first metal layer and the second metal layer are both in a central symmetry structure.
In one possible embodiment of the method according to the invention,
the distance between the first metal layer and the second metal layer is 0.2mm to 2mm;
the aperture width of the cross-shaped aperture unit is 0.1 mm-0.5 mm, the aperture width of the dipole aperture unit is 0.1 mm-0.5 mm, and the distance between two adjacent aperture units is 0.1 mm-0.5 mm.
In one possible embodiment, the first metal layer and the second metal layer are formed by photolithography or a printed circuit board manufacturing process; and/or
The material from which the first and second metal layers are made comprises at least one of gold, silver, copper and aluminum;
the material for preparing the medium substrate comprises a fiber material and/or a resin material; and/or
The dielectric substrate has a thickness of 0.2mm to 2mm, a dielectric constant of 1 to 6 and a dielectric loss tangent of less than 0.01.
In one possible embodiment, the multi-band frequency selective surface structure has maximum transmission at 3.62GHz, 5.07GHz, and 6.37 GHz.
According to a second aspect of the present application, there is provided a signal receiving apparatus comprising:
an antenna body;
according to any of the above technical solutions, the multiband frequency selective surface structure is disposed on the antenna body.
Compared with the prior art, the invention at least comprises the following beneficial effects: the application provides a multiband frequency selective surface structure has included the dielectric substrate, sets up first metal level and the second metal level of the relative setting in dielectric substrate both sides, and is formed with cross aperture unit on the first metal level and arranges the dipole aperture unit in cross aperture unit week side, is formed with cross paster unit on the second metal level and arranges the dipole paster unit in cross paster unit week side. This application forms cross aperture unit and dipole aperture unit on first metal level, and form cross paster unit and dipole paster unit on the second metal level, be complementary structure with the aperture unit of first metal level, the design of the multiband frequency selection surface structure that this application provided through carrying out tortuous transform and adjacent unit intercommunication to cross unit and dipole unit, closely fill the periodic unit, resonance length has effectively been increased, the miniaturization of unit structure has been realized, when effectively avoiding the grating lobe to produce, can obtain good angle stability. In the working process, two resonant passband can be formed by utilizing the aperture unit compounded in the first metal layer, the multiband frequency selection surface structure can realize the three-band pass filtering characteristic by loading the second metal layer which is complementary with the first metal layer structure and introducing a transmission zero point near the first resonant frequency band formed by the first metal layer, and the structure realizes extremely stable frequency selection characteristic for electromagnetic waves under different polarization modes and incidence angles and has excellent polarization stability and angle stability.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic block diagram of a multi-band frequency selective surface structure periodic element according to one embodiment provided herein;
FIG. 2 is a schematic block diagram of a cross-shaped aperture unit of a multi-band frequency selective surface structure according to an embodiment of the present disclosure
Fig. 3 is a schematic block diagram of a dipole aperture element of a multi-band frequency selective surface structure according to an embodiment provided herein;
FIG. 4 is a schematic block diagram of a first metal layer portion periodic element of a multi-band frequency selective surface structure according to one embodiment provided herein;
FIG. 5 is an enlarged schematic view at A in FIG. 4;
fig. 6 is a schematic block diagram of an aperture element of a multi-band frequency selective surface structure of an embodiment provided herein;
fig. 7 is a schematic block diagram of a patch element of a multiband frequency selective surface structure according to an embodiment provided herein;
fig. 8 is a transmission characteristic of the multiband frequency selective surface structure according to an embodiment of the present disclosure when an electromagnetic wave of a TE polarization mode is vertically incident;
fig. 9 is a transmission characteristic of the multiband frequency selective surface structure according to an embodiment of the present disclosure when an electromagnetic wave of TM polarization is vertically incident;
fig. 10 shows transmission characteristics of the multiband frequency selective surface structure according to an embodiment of the present disclosure when electromagnetic waves of TE polarization are incident at different incident angles;
fig. 11 shows transmission characteristics of the multiband frequency selective surface structure according to an embodiment of the present disclosure when electromagnetic waves of TM polarization are incident at different incident angles.
Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 7 is:
110 a first metal layer, 120 a dielectric substrate, 130 a second metal layer;
111 aperture unit, 1111 cross aperture unit, 1112 dipole aperture unit, 131 patch unit, 1311 cross patch unit, 1312 dipole patch unit.
Detailed Description
In order to better understand the technical solutions of the embodiments of the present application, the following detailed descriptions are provided with accompanying drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the embodiments of the present application, but not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.
As shown in fig. 1 to 7, according to a first aspect of embodiments of the present application, there is provided a multiband frequency selective surface structure, comprising: the first metal layer 110, the first metal layer 110 is a periodic array structure composed of aperture units, and the aperture units are formed by compounding cross aperture units 1111 and dipole aperture units 1112 arranged on the peripheral side of the cross aperture units 1111; a dielectric substrate 120, the first metal layer 110 being disposed on one side of the dielectric substrate 120; and a second metal layer 130, wherein the second metal layer 130 is arranged on the other side of the dielectric substrate 120 and is arranged opposite to the first metal layer 110, and the second metal layer 130 is a periodic array structure composed of patch units, and the patch units are formed by compounding cross patch units 1311 and dipole patch units 1312 arranged on the peripheral sides of the cross patch units 1311.
The multiband frequency selective surface structure provided by the embodiment of the application comprises a dielectric substrate 120, a first metal layer 110 and a second metal layer 130 which are arranged on two sides of the dielectric substrate 120 and are oppositely arranged, a cross aperture unit 1111 and a dipole aperture unit 1112 arranged on the peripheral side of the cross aperture unit 1111 are formed on the first metal layer 110, and a cross patch unit 1311 and a dipole patch unit 1312 arranged on the peripheral side of the cross patch unit 1311 are formed on the second metal layer 130. This application embodiment is through the setting of first metal level 110 and second metal level 130, and form cross aperture unit 1111 and dipole aperture unit 1112 on first metal level 110, form cross paster unit 1311 dipole paster unit 1312 on second metal level 130, in the course of the work, this application embodiment is through carrying out the design of tortuous transform and adjacent unit intercommunication to cross unit and dipole unit, closely fill the periodic element, the resonance length has effectively been increased, the miniaturization of cell structure has been realized, when effectively avoiding the grating lobe to produce, can obtain good angle stability. The aperture unit 111 formed by combining the cross aperture unit 1111 and the dipole aperture unit 1112 in the first metal layer 110 may form two resonant pass-bands, and a transmission zero point is introduced near the first resonant frequency band formed by the first metal layer 110 by loading the second metal layer 130 with a structure complementary to that of the first metal layer 110, so that the multiband frequency selective surface structure may realize stable three-band pass-filtering characteristics.
The multiband frequency selective surface structure provided by the embodiment of the application has small size, can provide resonance at the filter pass band of 3.62GHz, 5.07GHz and 6.37GHz, realizes extremely stable frequency selective characteristics for electromagnetic waves under different polarization modes and incidence angles, has excellent polarization stability and angle stability, and has the advantages of simple structure, small size, small insertion loss and good application prospect in the fields of multiband antennas, radar radomes and the like.
In some examples, the first metal layer 110 and the second metal layer 130 are complementary structures, that is, an area where an aperture is formed on the first metal layer 110 is a metal path on the second metal layer 130, an area where a metal path is formed on the first metal layer 110 is an aperture on the second metal layer 130, and the first metal layer 110 and the second metal layer 130 have the same shape and size, when the first metal layer 110 is projected to the second metal layer 130, the aperture on the first metal layer 110 may overlap with the metal path on the second metal layer 130, and the metal path on the first metal layer 110 may overlap with the aperture on the second metal layer 130; conversely, when the second metal layer 130 is projected onto the first metal layer 110, the same aperture on the first metal layer 110 may overlap with the metal path on the second metal layer 130, and the metal path on the first metal layer 110 may overlap with the aperture of the second metal layer 130. The first metal layer 110 and the second metal layer 130 are respectively arranged on two sides of the dielectric substrate 120 and are arranged in parallel and symmetrically, based on the above, the second metal layer 130 is loaded to introduce a transmission zero point near a first resonant frequency band in two resonant frequency bands realized by the first metal layer 110, so that three-band-pass filtering characteristics can be realized, and extremely stable filtering characteristics are realized for electromagnetic waves under different polarization modes and incident angles.
As shown in fig. 5 and 7, in a possible embodiment, one dipole aperture unit 1112 is disposed at four corners of each cross aperture unit 1111, and each cross aperture unit 1111 and the four dipole aperture units 1112 are combined to form an aperture unit 111; the aperture units 111 are multiple, the multiple aperture units 111 are arranged on the first metal layer 110 in an array, and the dipole aperture units 1112 of two adjacent aperture units 111 are communicated; one dipole patch unit 1312 is arranged at four included angles of each cross patch unit 1311, and each cross patch unit 1311 and the four dipole patch units 1312 are compounded to form the patch unit 131; the patch units 131 are multiple, the multiple patch units 131 are arranged on the second metal layer 130 in an array, the dipole patch units 1312 of two adjacent patch units 131 are communicated, wherein the aperture unit and the patch unit have a period of 1mm to 20mm, preferably 6mm, that is, each aperture unit and each patch unit may be square, and the side length of the square may be 6mm.
In this technical scheme, cross aperture unit 1111 is through carrying out zigzag processing to the unit in order to increase electric length, every week side of cross aperture unit 1111 can be formed with four filling regions, four contained angles department at cross aperture unit 1111 can be formed with four filling regions promptly, set up a dipole aperture unit 1112 in every region, dipole aperture unit 1112 closely fills through zigzag technique, and be linked together through dipole aperture unit 1112 with adjacent aperture unit 111, further increase electric length, increase resonance wavelength, improve miniaturization degree, when effectively avoiding the grating lobe to produce, good angle stability has been obtained.
Based on the same reason, the second metal layer 130 and the first metal layer 110 are of a complementary structure, the cross patch unit 1311 performs zigzag processing on the unit to increase the electrical length, four filling areas can be formed on the peripheral side of each cross patch unit 1311, that is, four filling areas can be formed at four corners of the cross patch unit 1311, one dipole patch unit 1312 is arranged in each area, wherein the dipole patch units 1312 are tightly filled through a zigzag technology and are communicated with the dipole patch units 1312 of the adjacent patch units 131, the electrical length is further increased, the resonance wavelength is increased, the miniaturization degree is improved, and good angular stability is obtained while the generation of grating lobes is effectively avoided.
As shown in figures 6 and 7 of the drawings,D x andD y the array period of the aperture unit 111 and the patch unit 131 is 6mm for the lateral and longitudinal array periods of the aperture unit and the patch unit. In some examples, the aperture unit 111 and the patch unit 131 may be square, with dimensions of only 6.0mm × 6.0mm, corresponding to 0.072 of the resonance wavelength, with a high degree of miniaturization.
As shown in fig. 4, in a possible embodiment, the apertures formed by the dipole aperture units 1112 of two adjacent aperture units 111 communicating with each other are arranged obliquely; for the same reason, the metal paths formed by the dipole patch cells 1312 of two adjacent patch cells 131 communicated with each other are arranged obliquely.
In this technical solution, a setting mode of an aperture formed by the dipole aperture units 1112 of two adjacent aperture units 111 being communicated is further provided, and the aperture formed by the dipole aperture units 1112 of two adjacent aperture units 111 being communicated is inclined, so that the cross aperture unit 1111 can be avoided well, the coverage area of the dipole aperture unit 1112 on the first metal layer 110 can be further increased, the electrical length can be further increased, and the miniaturization of the multiband frequency selective surface structure is further facilitated.
In some examples, the apertures formed by the dipole aperture units 1112 of two adjacent aperture units 111 communicating with each other may be inclined at 30 ° to 45 ° relative to the lateral sides of the aperture unit 1111, so as to better avoid the cross aperture unit 1111, facilitate the implementation of the central symmetry of the first metal layer 110, facilitate the layout of the dipole aperture units 1112, and improve the angle stability and polarization stability of the multiband frequency selective surface structure.
In the technical scheme, a metal path formed by the dipole patch units 1312 of two adjacent patch units 131 communicated is further provided, and the metal path formed by the dipole patch units 1312 of two adjacent patch units 131 communicated is obliquely arranged, so that the cross patch unit 1311 can be avoided well, the coverage area of the dipole patch units 1312 on the second metal layer 130 can be further increased, the electrical length can be further increased, and the miniaturization of the multiband frequency selection surface structure is further facilitated.
In some examples, the metal paths formed by the dipole patch cells 1312 of two adjacent patch cells 131 being communicated may be inclined at an angle of 30 ° to 45 ° with respect to the transverse edge of the cross patch cell 1311, so as to better avoid the cross patch cell 1311, facilitate the central symmetry of the second metal layer 130, facilitate the layout of the dipole patch cells 1312, and improve the angular stability and polarization stability of the multiband frequency selective surface structure.
As shown in fig. 5 and 7, in a possible embodiment, each of the dipole aperture units includes a plurality of meanders formed by bending the dipole aperture unit 1 to 20 times, and the meanders have a meander angle of 90 °; each dipole patch unit comprises a plurality of bent parts formed by bending the dipole patch unit for 1 to 20 times, the bent angle of each bent part is 90 degrees, preferably, each dipole aperture unit 1112 comprises a plurality of bent parts, the bent angle of each bent part is 90 degrees, the number of the bent parts is 10, and the resonance length can be further improved by more than 10; each dipole patch cell 1312 includes a plurality of bends having a bend angle of 90 °, and the number of bends is 10, which may be greater than 10 to further increase the resonant length.
In this technical solution, two ends of each dipole aperture unit 1112 are provided with a meander line, the meander angle of the meander line is 90 °, and the meander is converted for 10 times or more than 10 times, so that the coverage area of the dipole aperture unit 1112 in the gap around the cross aperture unit 1111 can be increased.
In this embodiment, the shape of the dipole patch unit 1312 is the same as that of the dipole aperture unit 1112, and the dipole patch unit 1312 is bent in the same manner, so that the coverage area of the dipole patch unit 1312 in the gap on the peripheral side of the cross patch unit 1311 can be increased.
As shown in fig. 2, in a possible embodiment, the cross aperture unit 1111 includes: a cross-shaped aperture and a bending aperture formed at the end of the cross-shaped aperture;
as shown in fig. 7, in one possible embodiment, the cross patch unit 1311 includes: cross patches and bent patches formed at the ends of the cross patches.
In this technical solution, the dipole aperture units 1112 are also bent, and two ends of each dipole aperture unit 1112 are provided with zigzag lines, and the zigzag lines are bent and transformed 10 times at a zigzag angle of 90 degrees, and are filled clockwise. The four arms of the cross-shaped aperture unit 1111 are obtained by 4-time zigzag transformation and filled in the space in the middle of the dipole aperture unit 1112. Through carrying out tortuous processing to cross aperture unit 1111 and dipole aperture unit 1112 to link together dipole aperture unit 1112 and the dipole aperture unit 1112 of adjacent aperture unit 111, make the unit compact packing arrange, can effectively increase electric length, realized the miniaturization of cell structure, effectively avoid the grid lamella to produce, obtain good angle stability.
In this technical solution, similarly, the dipole patch cells 1312 are subjected to bending processing, and both ends of each dipole patch cell 1312 are provided with zigzag lines, the zigzag lines have a zigzag angle of 90 °, are bent and transformed 10 times, and are filled clockwise. The four arms of the cross patch cell 1311 are obtained by 4-fold transformation, and fill the space in the middle of the dipole patch cell 1312. Through carrying out tortuous processing to cross paster unit 1311 and dipole paster unit 1312 to couple together dipole paster unit 1312 with the dipole paster unit 1312 of adjacent aperture cell 131, make the compact packing of unit arrange, can effectively increase electric length, realized the miniaturization of cell structure, effectively avoid the grating lamella to produce, obtain good angle stability.
The first metal layer 110 generates two filter pass bands by utilizing the interaction of the cross aperture unit 1111 and the dipole aperture unit 1112, and a transmission zero is introduced near a first resonant frequency band formed by the first metal layer 110 by loading the second metal layer 130 with a structure complementary to that of the first metal layer 110, so that the multi-band frequency selection surface structure can realize stable three-band-pass filtering characteristics.
As shown in fig. 1, in one possible embodiment, the cross aperture unit 1111 has the same shape and size as the cross patch unit 1311, the dipole aperture unit 1112 has the same shape and size as the dipole patch unit 1312, the first metal layer 110 is disposed parallel to the second metal layer 130, and the first metal layer 110 and the second metal layer 130 form a complementary structure.
It is understood that the cross aperture unit 1111 has the same shape as the cross patch unit 1311, the dipole aperture unit 1112 has the same shape as the dipole patch unit 1312, the first metal layer 110 is disposed parallel to the second metal layer 130, and the first metal layer 110 has the same shape as the second metal layer 130, that is, the first metal layer 110 and the second metal layer 130 have complementary structures, that is, the area where the aperture is formed on the first metal layer 110 is the metal path on the second metal layer 130, the area where the metal path is formed on the first metal layer 110 is the aperture on the second metal layer 130, and the first metal layer 110 and the second metal layer 130 have the same shape and size, when the first metal layer 110 is projected to the second metal layer 130, the aperture on the first metal layer 110 may overlap the metal path on the second metal layer 130, and the metal path on the first metal layer 110 may overlap the aperture on the first metal layer 110; conversely, when the second metal layer 130 is projected onto the first metal layer 110, the same aperture on the first metal layer 110 may overlap with the metal path on the second metal layer 130, and the metal path on the first metal layer 110 may overlap with the aperture on the first metal layer 110. The first metal layer 110 and the second metal layer 130 are respectively arranged on two sides of the dielectric substrate 120 and are arranged in parallel and symmetrically, based on the above, loading the second metal layer 130 can introduce a transmission zero point near the first resonant frequency band of the two resonant frequency bands realized by the first metal layer 110, so that three-band-pass filtering characteristics can be realized, and when electromagnetic waves under different polarization modes and incident angles are incident, an extremely stable frequency selection characteristic is realized, and the three-band-pass filtering structure has excellent polarization stability and angle stability, and is simple in structure, small in size and small in insertion loss.
As shown in fig. 1, in one possible embodiment, the first metal layer 110 and the second metal layer 130 are both centrosymmetric structures, which can achieve excellent polarization stability of the multiband frequency selective surface structure.
It is understood that the first metal layer 110 and the second metal layer 130 may be both square, and the first metal layer 110 and the second metal layer 130 are symmetrical based on the intersection point of the diagonals of the square.
As shown in fig. 1, 6 and 7, whereinhIs the distance between the first metal layer and the second metal layer, wherein in FIG. 6wThe aperture width of the cross-shaped aperture unit 1111,sthe aperture width of the dipole aperture element 1112,gis half the distance between adjacent aperture units 111 on the first metal layer 110, as shown in FIG. 7wIs the width of the cross patch unit 1311,sthe width of the aperture of the dipole patch cell 1312,ghalf the pitch of the adjacent patch units 131 on the second metal layer 130, in a possible embodiment, the distance between the first metal layer 110 and the second metal layer 130 is 0.5mm.
In one possible embodiment, the distance between the first metal layer and the second metal layer is 0.2mm to 2mm; the aperture widths of the cross aperture units and the cross patch units are 0.1mm to 0.5mm, the aperture widths of the dipole aperture units and the dipole patch units are 0.1mm to 0.5mm, the distance between two adjacent aperture units and two adjacent patch units is 0.1mm to 0.5mm, preferably, the aperture widths of the cross aperture units 1111 and the cross patch units 1311 are 0.2mm, the aperture widths of the dipole aperture units 1112 and the dipole patch units 1312 are 0.2mm, the half of the pitch of the aperture units on the first metal layer 110 is 0.1mm, and the half of the pitch of the patch units on the second metal layer 130 is 0.1mm.
In this technical solution, further providing the distances between the cross aperture unit 1111, the dipole aperture unit 1112, and the aperture units on the first metal layer 110, and the distances between the cross patch unit 1311, the dipole patch unit 1312, and the patch units on the second metal layer 130, based on which, on one hand, the coverage areas of the cross aperture unit 1111 and the dipole aperture unit 1112 on the first metal layer 110, and the coverage areas of the cross patch unit 1311 and the dipole patch unit 1312 on the second metal layer 130 can be increased, and on the other hand, the multiband frequency selective surface structure can have extremely strong filter characteristics around 3.62GHz, 5.07GHz, and 6.37GHz, and can ensure that communication signals of corresponding frequency bands are not interfered by other frequency signals, and under the incident electromagnetic wave at an angle of 0 ° to 60 °, the central resonance frequencies of three frequency bands deviate very little, and the filter characteristics remain stable.
In a possible embodiment, the first metal layer 110 and the second metal layer 130 are formed by a photolithography technique or a printed circuit board manufacturing process, which is configured to facilitate the production and processing of the first metal layer 110 and the second metal layer 130, and simultaneously, is beneficial to ensuring the processing precision, and can further improve the angular stability and polarization stability of the multiband frequency selective surface structure.
In one possible embodiment, the material for preparing the first metal layer 110 and the second metal layer 130 includes at least one of gold, silver, copper, and aluminum.
In one possible embodiment, the material from which the media substrate 120 is made includes a fibrous material and/or a resin material; and/or the dielectric substrate has a thickness of 0.2mm to 2mm, a dielectric constant of 1 to 6 and a dielectric loss tangent of less than 0.01, preferably, the dielectric substrate 120 has a thickness of 0.5mm, a dielectric constant of 2.65 and a dielectric loss tangent of 0.002, so that the insertion loss of the multiband frequency selective surface structure resonance frequency band is small.
In one possible embodiment, the multi-band frequency selective surface structure has maximum transmission at 3.62GHz, 5.07GHz, and 6.37 GHz. The application range of the multiband frequency selective surface structure can be improved by changing the structural size parameters.
According to a second aspect of embodiments of the present application, there is provided a signal receiving apparatus, including: an antenna body; in the multi-band frequency selective surface structure according to any of the above technical solutions, the multi-band frequency selective surface structure is disposed on the antenna body.
The signal receiving device provided in the embodiment of the present application includes the multiband frequency selective surface structure according to the above technical solution, so that the signal receiving device has all the beneficial effects of the multiband frequency selective surface structure according to the above technical solution, which are not described herein again.
Test example
In order to verify the filter characteristics of the multiband frequency selective surface structure of the present embodiment, the filter characteristics of the multiband frequency selective surface structure under different polarization modes and incident angles are simulated and analyzed.
Fig. 8 shows a transmission characteristic curve of the multiband frequency selective surface structure of the present embodiment at a time of vertical incidence of electromagnetic waves of TE polarization, from which it can be seen that the multiband frequency selective surface structure resonates at around 3.62GHz, 5.07GHz, and 6.37GHz, respectively, a-3 dB bandwidth of a first resonant frequency band is 0.82GHz, a-3 dB bandwidth of a second resonant frequency band is 0.28GHz, and a-3 dB bandwidth of a third resonant frequency band is 0.57GHz, and the multiband frequency selective surface structure realizes three highly selective filter pass bands.
Fig. 9 shows a transmission characteristic curve of the multiband frequency selective surface structure of this embodiment when an electromagnetic wave of the TM polarization mode is perpendicularly incident, the multiband frequency selective surface structure has extremely strong filter characteristics at around 3.60GHz, 5.08GHz, and 6.31GHz, and-3 dB bandwidths of the corresponding frequency bands are 0.74GHz, 0.27GHz, and 0.49GHz, respectively.
In order to examine the angular stability of the multiband frequency selective surface structure, electromagnetic waves of TE polarization and TM polarization were incident at incidence angles of 0 °, 30 °, 45 °, and 60 °, respectively, and the filter characteristics of the multiband frequency selective surface structure were examined. Fig. 10 is a transmission characteristic of the multiband frequency selective surface structure when an electromagnetic wave is incident at different incident angles in the TE polarization mode, and fig. 11 is a transmission characteristic of the multiband frequency selective surface structure when an electromagnetic wave is incident at different incident angles in the TM polarization mode.
As can be seen from fig. 10, in the TE polarization mode, when the incident angle of the electromagnetic wave is increased from 0 ° to 60 °, the multiband frequency selective surface structure has stable filter characteristics in the vicinity of 3.62GHz, 5.07GHz, and 6.37GHz, the shift of the center resonance frequency of all three frequency bands is small, only 0.05GHz, and the filter characteristics have excellent angular stability.
As can be seen from fig. 11, in the TM polarization mode, when electromagnetic waves are incident at different angles, the multiband frequency selective surface structure still has stable filter characteristics in the vicinity of 3.60GHz, 5.08GHz, and 6.31GHz, the shift of the center resonance frequency of all three frequency bands is small, and is only 0.04GHz, and the filter characteristics have excellent angular stability.
It can be seen from fig. 10 and 11 that the multiband frequency selective surface structure has three stable filter passbands all the time when electromagnetic waves under TE polarization and TM polarization are incident at an incident angle of 0 ° to 60 °, and the central resonance frequency remains stable, having excellent angular stability and polarization stability.
Example 1
The multiband frequency selective surface structure of the present embodiment includes, in order from top to bottom, a first metal layer 110, a dielectric substrate 120, and a second metal layer 130, as shown in fig. 1. In the embodiment of the present disclosure, the multiband frequency selective surface structure is arranged in a square arrangement with an array periodD x =D y =6.0mm. The first metal layer 110 is made of copper and is formed by periodically arranging aperture units, and each aperture unit is formed by compounding one zigzag transformed cross aperture unit 1111 and four zigzag transformed dipole aperture units 1112, as shown in fig. 6. Wherein, four supporting arms of the cross-shaped aperture unit 1111 are obtained by 4 times of zigzag transformation and are formed around the center of the structureThe structure of the centrosymmetric unit, the cross aperture unit 1111 is shown in fig. 2. Each dipole aperture unit 1112 is connected with the dipole aperture unit 1112 of the adjacent aperture unit 111, the included angle between the connection position and the boundary is 45 degrees, two ends of each dipole aperture unit 1112 are provided with zigzag lines, the zigzag lines have a zigzag angle of 90 degrees and are bent and transformed for 10 times in the clockwise direction, a central symmetrical unit is formed around the center of the structure, and the structure of the dipole aperture unit 1112 is shown in fig. 3. Detailed structural parameters of the aperture unit 111 in the first metal layer 110 are shown in table 1 below. The second metal layer 130 is made of copper and is formed by periodically arranging patch units 131, and the patch units 131 and the aperture units 111 of the first metal layer 110 are complementary structures and have the same shape and size as the aperture units 111 of the first metal layer 110, as shown in fig. 7. The detailed structural parameters of the patch unit 131 are shown in table 1 below. In the disclosed embodiment, the dielectric substrate 120 is F4B PTFE with a relative dielectric constantε r =2.65, thicknessh=0.5mm, dielectric loss tangent tanδ=0.002。
TABLE 1 Multiband frequency-selective surface Structure parameters
| Parameter(s) | D x | D y | s | w | g |
| Value (mm) | 6 | 6 | 0.2 | 0.2 | 0.1 |
In order to verify the filter characteristics of the multiband frequency selective surface structure of the present embodiment, the filter characteristics of the multiband frequency selective surface structure under different polarization modes and incident angles are simulated and analyzed.
Fig. 8 shows a transmission characteristic curve of the multiband frequency selective surface structure of the present embodiment at the time of vertical incidence of electromagnetic waves in the TE polarization mode, from which it can be seen that the multiband frequency selective surface structure resonates around 3.62GHz, 5.07GHz, and 6.37GHz, respectively, a-3 dB bandwidth of a first resonant frequency band is 0.82GHz, a-3 dB bandwidth of a second resonant frequency band is 0.28GHz, and a-3 dB bandwidth of a third resonant frequency band is 0.57GHz, and the multiband frequency selective surface structure realizes three highly selective filter passbands.
Fig. 9 shows a transmission characteristic curve of the multiband frequency selective surface structure of this embodiment when an electromagnetic wave of the TM polarization mode is perpendicularly incident, the multiband frequency selective surface structure has extremely strong filter characteristics at around 3.60GHz, 5.08GHz, and 6.31GHz, corresponding-3 dB bandwidths are 0.74GHz, 0.27GHz, and 0.49GHz, respectively, and the multiband frequency selective surface structure has almost no change in the center resonance frequency of three frequency bands, a small bandwidth deviation, and excellent polarization stability, compared with the TE polarization mode.
In order to examine the angular stability of the multiband frequency selective surface structure, electromagnetic waves of TE polarization and TM polarization were incident at incidence angles of 0 °, 30 °, 45 °, and 60 °, respectively, and the filter characteristics of the multiband frequency selective surface structure were examined. Fig. 10 is a transmission characteristic of the multiband frequency selective surface structure when an electromagnetic wave is incident at different incident angles in the TE polarization mode, and fig. 11 is a transmission characteristic of the multiband frequency selective surface structure when an electromagnetic wave is incident at different incident angles in the TM polarization mode.
As can be seen from fig. 10, in the TE polarization mode, when the incident angle of the electromagnetic wave is increased from 0 ° to 60 °, the multiband frequency selective surface structure has stable filter characteristics in the vicinity of 3.62GHz, 5.07GHz, and 6.37GHz, the shift of the center resonance frequency of all three frequency bands is small, only 0.05GHz, and the filter characteristics have excellent angular stability.
As can be seen from fig. 11, in the TM polarization mode, when an electromagnetic wave is incident at different angles, the multiband frequency selective surface structure still has stable filter characteristics in the vicinity of 3.60GHz, 5.08GHz, and 6.31GHz, the shift of three center resonance frequencies is small, only 0.04GHz, and the filter characteristics have excellent angular stability.
It can be seen from fig. 10 and 11 that the multiband frequency selective surface structure always has three stable band-pass type resonance frequency bands when electromagnetic waves under TE polarization and TM polarization are incident at an incident angle of 0 ° to 60 °, and the central resonance frequency remains stable, having excellent angle stability and polarization stability.
The embodiment of the application has at least the following beneficial effects:
(1) The multiband frequency selection surface structure has extremely strong filtering characteristics near 3.62GHz, 5.07GHz and 6.37GHz, and can ensure that communication signals of corresponding frequency bands are not interfered by other frequency signals.
(2) The surface structure with the multiband frequency selection function is a centrosymmetric structure, has excellent polarization stability, and keeps stable because the central resonance frequency of three frequency bands is almost unchanged when electromagnetic waves with different polarizations are incident.
(3) The multiband frequency selection surface structure has excellent angle stability, the central resonance frequency deviation of three frequency bands is very small and is only 0.05GHz under the condition that electromagnetic waves are incident at an angle of 0-60 degrees, and the filtering characteristic is kept stable.
(4) The multiband frequency selective surface structure of the present invention has a cell spacing of only 6.0mm × 6.0mm, and is highly miniaturized.
(5) The surface structure with multiband frequency selection of the present invention can be applied to multiband antennas or radomes.
In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are used broadly and should be construed to include, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A multi-band frequency selective surface structure, comprising:
a first metal layer on which cross-shaped aperture elements and dipole aperture elements arranged on the peripheral sides of the cross-shaped aperture elements are formed;
the first metal layer is arranged on one side of the dielectric substrate;
the second metal layer is arranged on the other side of the medium substrate and is opposite to the first metal layer, and a cross patch unit and dipole patch units arranged on the peripheral side of the cross patch unit are formed on the second metal layer;
the dipole aperture unit is arranged at four included angles of each cross aperture unit, and each cross aperture unit and the four dipole aperture units are compounded to form an aperture unit;
the aperture units are multiple, the multiple aperture unit arrays are arranged on the first metal layer, and the dipole aperture units of two adjacent aperture units are communicated;
the four included angles of each cross patch unit are provided with one dipole patch unit, and each cross patch unit and the four dipole patch units are compounded to form a patch unit;
the patch units are arranged on the second metal layer in an array mode, and the dipole patch units of every two adjacent patch units are communicated.
2. The multiband frequency selective surface structure of claim 1,
the aperture unit and the patch unit have a period of 1mm to 20mm.
3. The multiband frequency selective surface structure of claim 1,
the dipole aperture units of two adjacent aperture units are communicated to form an aperture which is inclined;
and the metal paths formed by the communicated dipole patch units of two adjacent patch units are obliquely arranged.
4. The multiband frequency selective surface structure of claim 3,
each dipole aperture unit comprises a plurality of zigzag portions, the zigzag portions are formed by bending the dipole aperture unit for 1 to 20 times, and the zigzag angle of each zigzag portion is 90 degrees;
each dipole patch unit comprises a plurality of bent parts, the bent parts are formed by bending the dipole patch unit for 1 to 20 times, and the bending angle of each bent part is 90 degrees.
5. The multiband frequency selective surface structure of claim 1, wherein the cross aperture unit comprises:
a cross-shaped aperture and a bent aperture formed at an end of the cross-shaped aperture.
6. The multiband frequency selective surface structure according to any one of claims 1 to 5,
the cross aperture unit and the cross patch unit are the same in shape and size, and the dipole aperture unit and the dipole patch unit are the same in shape and size;
the first metal layer and the second metal layer are arranged in parallel, and form a complementary structure;
the first metal layer and the second metal layer are both in a central symmetry structure.
7. The multiband frequency selective surface structure according to any one of claims 1 to 5,
the distance between the first metal layer and the second metal layer is 0.2mm to 2mm;
the aperture width of the cross-shaped aperture unit is 0.1 mm-0.5 mm, the aperture width of the dipole aperture unit is 0.1 mm-0.5 mm, and the distance between two adjacent aperture units is 0.1 mm-0.5 mm.
8. The multiband frequency selective surface structure according to any one of claims 1 to 5,
the first metal layer and the second metal layer are formed by photoetching technology or printed circuit board preparation technology; and/or
The material from which the first and second metal layers are made comprises at least one of gold, silver, copper and aluminum;
the material for preparing the medium substrate comprises a fiber material and/or a resin material; and/or
The dielectric substrate has a thickness of 0.2mm to 2mm, a dielectric constant of 1 to 6 and a dielectric loss tangent of less than 0.01.
9. The multiband frequency selective surface structure according to any one of claims 1 to 5,
the multi-band frequency selective surface structure has maximum transmittance at 3.62GHz, 5.07GHz, and 6.37 GHz.
10. A signal receiving apparatus, comprising:
an antenna body;
the multi-band frequency selective surface structure of any one of claims 1 to 9, disposed on the antenna body.
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| US8872713B1 (en) * | 2010-04-21 | 2014-10-28 | Rockwell Collins, Inc. | Dual-polarized environmentally-hardened low profile radiating element |
| US9362615B2 (en) * | 2012-10-25 | 2016-06-07 | Raytheon Company | Multi-bandpass, dual-polarization radome with embedded gridded structures |
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| US20190386364A1 (en) * | 2018-06-14 | 2019-12-19 | Edward Liang | Angle of incidence-stable frequency selective surface device |
| CN108615976B (en) * | 2018-06-15 | 2020-12-08 | 西安电子科技大学 | Radome-based dual-passband/wide-stopband reconfigurable frequency selection surface |
| CN112928491B (en) * | 2021-01-13 | 2022-03-15 | 电子科技大学 | Ultra-wideband wave-absorbing dual-polarized switchable anti-absorption integrated material |
| CN112928486B (en) * | 2021-01-27 | 2022-04-29 | 四川大学 | Three-band frequency selection surface |
| CN113161756A (en) * | 2021-04-14 | 2021-07-23 | 西安旭彤电子科技股份有限公司 | Frequency selective surface structure with close spacing characteristic and unit structure thereof |
| CN113346250B (en) * | 2021-06-22 | 2022-09-16 | 重庆邮电大学 | Millimeter wave three-frequency selection surface based on multilayer coupling structure |
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