CN111403920A - SIW cross polarization converter insensitive to polarization - Google Patents
SIW cross polarization converter insensitive to polarization Download PDFInfo
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- CN111403920A CN111403920A CN201911116398.4A CN201911116398A CN111403920A CN 111403920 A CN111403920 A CN 111403920A CN 201911116398 A CN201911116398 A CN 201911116398A CN 111403920 A CN111403920 A CN 111403920A
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- 230000010287 polarization Effects 0.000 title claims abstract description 58
- 238000005388 cross polarization Methods 0.000 title claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052802 copper Inorganic materials 0.000 claims abstract description 15
- 239000010949 copper Substances 0.000 claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 230000008878 coupling Effects 0.000 claims abstract description 4
- 238000010168 coupling process Methods 0.000 claims abstract description 4
- 238000005859 coupling reaction Methods 0.000 claims abstract description 4
- 230000000737 periodic effect Effects 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 150000002739 metals Chemical class 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 1
- 239000011148 porous material Substances 0.000 claims 1
- 238000003780 insertion Methods 0.000 abstract description 2
- 230000037431 insertion Effects 0.000 abstract description 2
- 238000013329 compounding Methods 0.000 abstract 1
- 238000005553 drilling Methods 0.000 abstract 1
- 238000005530 etching Methods 0.000 abstract 1
- 238000007747 plating Methods 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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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
- H01Q15/24—Polarising devices; Polarisation filters
- H01Q15/242—Polarisation converters
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- Aerials With Secondary Devices (AREA)
Abstract
The invention discloses a SIW cross polarization converter insensitive to polarization, which adopts the combination of a substrate integrated waveguide structure and an artificial electromagnetic structure and is used for converting linearly polarized electromagnetic waves polarized in any direction into a cross polarization direction. The resonance unit is formed by compounding two parts: two rectangular copper patches, and an insulating F4B dielectric substrate. The artificial periodic electromagnetic structure unit is formed by etching four rectangular holes with 90-degree rotational symmetry on a copper-clad substrate, and periodically drilling through holes on the boundary of the periodic unit and plating copper on the edge. The polarization switching mechanism is: when linearly polarized waves polarized in any direction at 5.8GHz are normally incident to the front surface of the structure, resonance is generated through magnetic coupling, incident wave energy is coupled into the SIW cavity, and the incident wave energy is radiated to a transmission space through four rectangular holes with the back surface rotated by 90 degrees, so that 90-degree polarization conversion is completed. Compared with the traditional polarization conversion device, the polarization conversion device has the advantages of simple structure, insensitive polarization, low insertion loss, high polarization conversion efficiency and low preparation cost.
Description
Technical Field
The invention belongs to the technical field of electromagnetism, adopts a SIW structure and a planar artificial electromagnetic structure, and particularly relates to a cross polarization converter insensitive to polarization.
Background
At present, the propagation control of electromagnetic waves becomes a hotspot for research in the electromagnetic field, and the polarization technology as an important interference and anti-interference technology also becomes a hotspot for research in the military scientific research field. The polarization converter is a device with a function of controlling the polarization direction of electromagnetic waves, is usually loaded in front of the radiation aperture of an antenna, and is one of important devices for electromagnetic wave propagation state control application. In the field of wireless communication, the connection reliability of a communication link can be enhanced through the switching of the polarization state of electromagnetic waves; in the fields of radar and medical imaging, the resolution of target imaging can be effectively enhanced by detecting electromagnetic waves and switching the multi-polarization state.
When linearly polarized electromagnetic waves propagate in free space, due to the complexity of the space environment, effects such as scattering, refraction, diffraction and the like can be generated, so that the polarization direction of the electromagnetic waves is changed. When the polarization direction of the electromagnetic wave is not the same as that of the receiving antenna, the receiving efficiency is lowered, and when the polarization directions of the electromagnetic wave and the receiving antenna are orthogonal, the antenna receives almost no electromagnetic signal. The polarization direction of the received signal is deflected to the polarization direction of the receiving antenna, so that the antenna has the best receiving efficiency. Most of linear polarization wave cross polarization converters designed based on artificial electromagnetic structures have polarization selection characteristics, namely, incident incoming waves have to be consistent with the polarization direction of the artificial electromagnetic structure units, otherwise, the incident incoming waves are reflected, and the polarization conversion efficiency is reduced. Aiming at the defects, the invention designs the cross polarization converter of the linearly polarized wave, which is suitable for any polarization direction, has high conversion efficiency and low insertion loss.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, a polarization converter combining a SIW structure and a planar artificial electromagnetic structure is provided for improving the polarization conversion efficiency.
The technical scheme is as follows: the invention provides a SIW cross polarization converter insensitive to polarization, which adopts the combination of a substrate integrated waveguide structure and an artificial electromagnetic structure and is used for converting linearly polarized electromagnetic waves polarized in any direction into a cross polarization direction; the substrate integrated waveguide plays a role in guiding electromagnetic waves and collecting field distribution. Compared with general polarization conversion, the polarization converter using the artificial electromagnetic structure has higher polarization conversion efficiency and more polarization state modes.
The polarization converter comprises an array consisting of resonant units, wherein each resonant unit consists of two parts, one part consists of two rectangular metals with openings, the other part is an F4B dielectric substrate, the F4B dielectric substrate is clamped between the two metal surfaces, each unit structure in the array comprises a metal copper surface, a copper-plated through hole, four rectangular grooves which are respectively cut on the metal copper surfaces on two sides and an F4B dielectric substrate, the metal copper surfaces are provided with round holes, furthermore, the size of each rectangular groove is 19.5 × 2.9.9 mm, the distance between the central point of each rectangular groove and the corresponding boundary of each resonant unit is 4.45mm, the four rectangular grooves are in 90-degree rotational symmetry, the adjacent rectangular grooves are mutually orthogonal, and the distance is 0.5 mm.
Further, the diameter of the metal copper surface round hole of the polarization converter is larger than that of the through hole.
Furthermore, 36 through holes are periodically drilled in each periodic unit boundary in the array and plated with copper on the edge, the radius of each through hole is 0.4mm, the distance between every two adjacent through holes is 2.88mm, the distance between each through hole and the corresponding unit boundary is 1.5mm, and the distance between each through hole and the rectangular groove boundary is 1.5 mm.
Further, the F4B dielectric board dielectric constant of the resonant cell was 2.65 and the loss tangent was 0.001.
Further, the polarization converter has a resonant cell size of 28.9 × 28.9.9 28.9 × 4mm and a thickness of 1/13 operating wavelengths.
The polarization converter conversion mechanism is that when linearly polarized waves with the frequency reaching 5.8GHz and polarized in any direction are normally incident to the front surface of the structure, resonance is generated through magnetic coupling, incident wave energy is coupled into the SIW cavity, and the incident wave energy is radiated to a transmission space through four rectangular holes with the back surface rotated by 90 degrees, so that 90-degree polarization conversion is completed.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: (1) the artificial electromagnetic structure with a new structural form can orthogonally decompose the linear polarization polarized in any direction, so that the polarization of the artificial electromagnetic structure is insensitive; (2) the structure is simple, the processing is easy, and the tuning of the working frequency of the unit is realized by adjusting the geometric parameters of the structure of the unit; (3) the mass is light, the integration of a wireless communication or radar system is convenient, the reflection loss is low, and the interference to a transmitting antenna is small; (4) the resonance unit can be periodically expanded, and has the advantages of flexible structure, low cost and easy mass production.
Drawings
FIG. 1 is a schematic diagram of an array structure;
FIG. 2(a) is a schematic front view of a cell structure; (b) a schematic diagram of a metal structure;
FIG. 3(a) polarization azimuth
Schematic diagram of the normal incidence linearly polarized electric field vector of (1); (b) a linear polarization electric field vector schematic diagram after cross polarization conversion;
FIG. 4(a) co-polarized reflection coefficients at normal incidence for linearly polarized waves of different polarization azimuths; (b) cross polarization transmission coefficients at normal incidence of linearly polarized waves of different polarization azimuths.
The specific implementation mode is as follows:
the technical scheme of the invention is further explained in detail by combining the attached drawings:
as shown in figure 1, the invention is formed by arranging 15 × 15 artificial unit structures regularly along the orthogonal direction, in figure 2(a) and figure 2(b), the structure of each unit in an array is illustrated, wherein 1 is a copper sheet on the front surface of a substrate, the occupied area of each unit is 28.9mm × 28.9.9 mm, 2 is a copper plated hole with the radius of 0.4mm, 3 is four rectangular grooves cut out of the copper sheet, the size of each rectangular groove is 19.5mm × 2.9.9 mm, the four rectangular grooves are in 90-degree rotational symmetry, 4 is an F4B medium substrate, the dot volume of each unit is 28.9mm × 28.9.9 mm × 4mm, the relative dielectric constant is 2.65, and the loss tangent is 0.001.
Fig. 3 illustrates the polarization switching mechanism of the present invention in detail. Fig. 3 indicates the directions of the coordinate axes in a spherical coordinate system. E represents incident electromagnetic wave of 5.8GHz, the incident direction is-Z axis, and the direction of the incident direction forms any included angle with the x-axis
Ex represents the x-axis component of the wave incident wave, Ey represents the y-axis component of the wave incident wave, the wave incident wave enters the cavity body through the rectangular open groove parallel to the y-axis and the rectangular open groove parallel to the x-axis in a coupling mode respectively, after two independent cavity body modes are formed, the wave incident wave is radiated through the rectangular open groove parallel to the x-axis and the rectangular open groove parallel to the y-axis on the back, and after the two independent cavity body modes are synthesized, the wave incident wave is radiated through the rectangular open groove parallelForming a transmitted wave that azimuthally intersects the polarization of the incident wave. Ex 'and Ey' represent the x-axis component and the y-axis component of the transmitted wave, respectively.
Fig. 4(a) and 4(b) show verification of the cross-polarization conversion effect of a linearly polarized wave at normal incidence for any polarization orientation. As shown in fig. 4.1 and 4.2, incident waves with different polarization orientations are irradiated onto the sample, and the generated co-polarization reflection coefficient (S11) and cross-polarization transmission coefficient (S12) are completely the same, which verifies that the cross-polarization converter sample designed by the invention has polarization insensitivity and the polarization conversion efficiency reaches more than 92%.
Claims (7)
1. A polarization insensitive SIW cross-polarization converter comprising a substrate integrated waveguide structure and an artificial electromagnetic structure, characterized in that: the array is composed of resonant units, each resonant unit is composed of two parts, one part is composed of two open-pore rectangular metals, the other part is an F4B dielectric substrate, and the F4B dielectric substrate is clamped between two metal surfaces; each unit structure in the array comprises a metal copper surface, a copper-plated through hole, four rectangular grooves and F4B medium substrates, wherein the four rectangular grooves are formed in the metal copper surfaces on two sides respectively, and the metal copper surfaces are provided with round holes.
2. The polarization transformer of claim 1 wherein each rectangular slot has a dimension of 19.5 × 2.9.9 mm and the center point of each rectangular slot is 4.45mm from the corresponding boundary of the resonant cell, and wherein four rectangular slots are 90 degree rotationally symmetric with adjacent slots orthogonal to each other and spaced 0.5mm apart.
3. The polarization transformer of claim 1 wherein each periodic cell boundary in the array is periodically drilled with 36 vias and edge plated with copper, the vias having a radius of 0.4mm, the spacing between adjacent vias being 2.88mm, each via being 1.5mm from the corresponding cell boundary and 1.5mm from the rectangular slot boundary.
4. The polarization transformer of claim 1, wherein the metal copper face circular hole diameter is larger than the via hole diameter.
5. The polarization transformer of claim 1 wherein the F4B dielectric slab has a dielectric constant of 2.65 and a loss tangent of 0.001.
6. The polarization converter of claim 1, wherein the resonant cell size is 28.9 × 28.9.9 28.9 × 4mm and the thickness is 1/13 operating wavelength.
7. The polarization converter according to claim 1, wherein the polarization conversion method is that when a linearly polarized wave with a frequency of 5.8GHz and any direction polarization is incident on the front surface of the structure, the structure generates resonance through magnetic coupling, couples the incident wave energy into the SIW cavity, and radiates the energy into the transmission space through four rectangular holes with the back surface rotated by 90 degrees, thereby completing 90-degree polarization conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911116398.4A CN111403920A (en) | 2019-11-15 | 2019-11-15 | SIW cross polarization converter insensitive to polarization |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911116398.4A CN111403920A (en) | 2019-11-15 | 2019-11-15 | SIW cross polarization converter insensitive to polarization |
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| CN111403920A true CN111403920A (en) | 2020-07-10 |
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| CN201911116398.4A Pending CN111403920A (en) | 2019-11-15 | 2019-11-15 | SIW cross polarization converter insensitive to polarization |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101179150A (en) * | 2007-11-12 | 2008-05-14 | 杭州电子科技大学 | Metallized through-hole infinitesimal disturbance based low profile back-cavity circularly polarized antenna |
| CN108183291A (en) * | 2017-12-25 | 2018-06-19 | 电子科技大学 | A kind of transmission-type multilayer polarization conversion structure based on SIW |
| CN210897637U (en) * | 2019-11-15 | 2020-06-30 | 南京信息工程大学 | SIW cross polarization converter insensitive to polarization |
-
2019
- 2019-11-15 CN CN201911116398.4A patent/CN111403920A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101179150A (en) * | 2007-11-12 | 2008-05-14 | 杭州电子科技大学 | Metallized through-hole infinitesimal disturbance based low profile back-cavity circularly polarized antenna |
| CN108183291A (en) * | 2017-12-25 | 2018-06-19 | 电子科技大学 | A kind of transmission-type multilayer polarization conversion structure based on SIW |
| CN210897637U (en) * | 2019-11-15 | 2020-06-30 | 南京信息工程大学 | SIW cross polarization converter insensitive to polarization |
Non-Patent Citations (1)
| Title |
|---|
| V KRUSHNA KANTH ET AL: "Performance analysis of FSS Element Based on Substrate Integrated Waveguide Cavity Technology", 2018 IEEE MTT-S INTERNATIONAL MICROWAVE AND RF CONFERENCE (IMARC), 30 November 2018 (2018-11-30), pages 1 - 4, XP033635988, DOI: 10.1109/IMaRC.2018.8877184 * |
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