CN211858899U - Efficient transmission type adjustable polarization converter based on SIW technology - Google Patents
Efficient transmission type adjustable polarization converter based on SIW technology Download PDFInfo
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Abstract
The utility model discloses an adjustable polarization converter of high-efficient transmission-type based on SIW technique, this polarization converter's structure mainly includes two-layer middle medium base plate and inlays respectively in two-layer copper post wherein to and the three-layer copper surface that has dug the dead slot. Wherein the second copper layer has vanadium dioxide (VO) applied on its surface2) The empty groove is filled, and the VO can be changed by regulating and controlling the temperature (T)2Such that the device can be switched between a polarization switch and a reflector. When VO is present2When the device is in a low-temperature state, the transmission type cross polarization conversion can be realized in the frequency band range of 13.57-16.10 GHz; when VO is present2At high temperature, the polarization conversion effect disappears, and the device will be drivenThe polarization converter converts to a reflector. The utility model has the advantages of the design is felt strong, the tunability is strong and the practicality is strong.
Description
Technical Field
The utility model relates to a polarization converter, specific adjustable polarization converter of high-efficient transmission-type based on SIW technique that says so belongs to GHz device technical field.
Background
Metamaterials (MMs for short) are artificial periodic composite structures or composite materials, and are formed by embedding designed metal microstructures in a certain dielectric material according to certain arrangement, so that the metamaterial not only can realize the extraordinary physical properties of negative refractive index, complex dielectric constant, negative magnetic permeability, reverse Doppler effect and the like, but also can realize the modulation of electromagnetic waves, change the propagation mode of the electromagnetic waves and the like. The electromagnetic metamaterial is a sub-wavelength artificial periodic structure with unit structure size far smaller than the working wavelength. When the operating wavelength is much larger than the size of the unit structure, the electromagnetic parameters of the electromagnetic metamaterial are determined by the resonance characteristics of the unit structure, such as the equivalent dielectric constant, the equivalent magnetic permeability, and the like. Therefore, the electromagnetic parameters of the electromagnetic metamaterial can be effectively regulated and controlled by designing the unit structure, and the development of the electromagnetic metamaterial greatly promotes the development of the polarization converter.
The polarization of the electromagnetic wave, i.e. the trajectory of the magnitude and direction of the electric field intensity vector E over time at a given point in space. The control of the polarization state of electromagnetic waves by manual methods has very broad applications and very important significance. The traditional ways of regulating and controlling the polarization of electromagnetic waves mainly comprise grating regulation and control, birefringence effect regulation and control and dichroism crystal regulation and control, but the methods have many defects, for example, the size of the material is far larger than the working wavelength, and the material is difficult to work in the electromagnetic wave frequency band with lower frequency; the energy consumption of the electromagnetic wave is large, and the polarization of the transmitted electromagnetic wave cannot be regulated. With the development of the electromagnetic metamaterial, a new method for regulating and controlling the electromagnetic wave is also provided, namely the electromagnetic metamaterial polarization converter, according to the energy conservation, the electromagnetic wave can be reflected, transmitted or absorbed after being incident on the surface of the metamaterial, if the absorption of the electromagnetic wave is zero or can be ignored, the phenomenon that the polarization mode of the reflected or transmitted electromagnetic wave and the incident electromagnetic wave is changed is polarization conversion, and the metamaterial structure for realizing the polarization conversion function is the electromagnetic metamaterial polarization converter.
In practical engineering applications, the polarization converter is often required to be loaded on a radiation source to realize the regulation and control of electromagnetic waves, while in the use of the reflection-type polarization converter, due to the mutual interference between reflected waves and incident waves and the shielding effect of the radiation source, the radiation performance of the whole equipment is affected, and therefore, the research on the transmission-type polarization converter is also very necessary.
The SIW is a quasi-closed planar guided wave structure fabricated using standard PCB processes, similar to a conventional rectangular metal waveguide. As a novel transmission line structure, SIW has the advantages of traditional rectangular waveguide and microstrip line concurrently: on one hand, the quasi-closed structure enables the SIW to have good transmission characteristics and electromagnetic compatibility characteristics; on the other hand, the SIW can be manufactured by a standard Printed Circuit Board (PCB) process, and can also be realized by an integration process such as multilayer LTCC/LCP, which endows the SIW with the characteristics of compact structure, light weight, and easy integration and processing. The SIW technology can be expected to have a potential wide application prospect in the fields of high-speed interconnection, system integration, device miniaturization and the like.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a high-efficiency transmission-type adjustable polarization converter based on the SIW technology, the polarization converter adopts a transmission-type structure, can realize transmission-type cross polarization conversion within 13.57-16.10GHz through reasonable parameter optimization, and can adjust VO in a hollow groove on the surface of the second layer of copper through temperature control2Thereby achieving a conversion between the polarization converter and the reflector.
The invention adopts the following technical scheme for solving the technical problems:
according to the utility model provides a high-efficient transmission-type adjustable polarization converter based on SIW technique, a serial communication port, polarization converter top-down include first layer copper surface, first layer dielectric layer and inlay in first layer metal post, second floor copper surface and complementary VO in this layer of dead slot in the middle of the first layer dielectric layer2The patch comprises a patch, a second dielectric layer, a second metal column embedded in the middle of the second dielectric layer, and a third copper surface.
The high-efficiency transmission-type adjustable polarization converter based on the SIW technology is characterized in that the empty groove part of the first layer of copper surface is in a Christmas tree shape, the branch part is formed by subtracting two circles from three rectangles with the same size, and the branch part is formed by rectangles; the length a of the rectangle of the branch part is 4mm, the width b is 1.8mm, the center of the circle minus the circle is positioned at the end point of the rectangle, the radius r of the circle minus the circle is 1.26mm, the length l of the rectangle of the branch part is 1.98mm, the width e of the rectangle is 1.26mm, and the groove thickness is consistent with the copper surface thickness.
As a high-efficient transmission-type adjustable polarization converter based on SIW technique, its characterized in that, the other parameters of the dead slot on second layer copper surface dwindles 0.8 times for the parameter of the dead slot on first layer copper surface with the same ratio, and the parameter of the dead slot on third layer copper surface keeps unchangeable.
As a high-efficient transmission-type adjustable polarization converter based on SIW technique, its characterized in that, the thickness on first layer, second floor and third layer copper surface is t ═ 0.017 mm.
As a high-efficient transmission-type adjustable polarization converter based on SIW technique, its characterized in that, the dead slot on first layer copper surface is along y axle direction, and the dead slot on second floor copper surface and third layer copper surface counter-clockwise turning is 45 and 90 for the dead slot on first layer copper surface respectively.
As the utility model discloses a high-efficient transmission-type adjustable polarization converter based on SIW technique, a serial communication port, VO2The patch has a low temperature state and a high temperature state; when the temperature is lower than 68 ℃, the material is in a low-temperature state, the material has dielectric property and the conductivity of the material is 20S/m; when the temperature is higher than or equal to 68 ℃, the material is in a high-temperature state, and the material has a metal characteristic, and the electrical conductivity of the material is 200000S/m.
As a high-efficient transmission-type adjustable polarization converter based on SIW technique, its characterized in that, the column radius r of first, two layers of metal post110.36mm, 0.945mm between columns; each row and each column has 9 columns with the same height as the thickness of the medium substrateThus, the method can be used for the treatment of the tumor.
As a high-efficient transmission-type adjustable polarization converter based on SIW technique, its characterized in that, two-layer middle medium base plate material be RT/Duroid 3003, dielectric constant 3, loss tangent value 0.002, thickness h 2.9mm, unit cycle length p 7.56 mm.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
(1) the utility model relates to a high-efficient transmission-type adjustable polarization converter based on SIW technique utilizes the SIW technique, has realized transmission-type cross polarization converter, and its operating band 13.57-16.10GHz is located the Ku wave band.
(2) The utility model discloses can realize transmission-type cross polarization conversion under less physical dimension to through control by temperature change VO2The device can be converted into a reflector from a polarization converter, and has the advantages of strong design feeling, strong tunability, strong practicability and the like.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is a top view of a first layer copper surface of the present invention.
Fig. 3 is a top view of a second layer copper surface of the present invention.
Fig. 4 is a top view of a third layer of copper surface of the present invention.
Fig. 5 is a (3 × 3) array diagram of the unit periodic arrangement according to the present invention.
Fig. 6 is a side view of the present invention.
Fig. 7 is a graph of the reflection amplitude of the present invention at normal incidence of electromagnetic waves (electric field along x-axis).
Fig. 8 is a graph of transmission amplitude of the present invention at normal incidence of electromagnetic waves (electric field along x-axis).
Fig. 9 is a graph of the transmittance polarization conversion ratio of the present invention at normal incidence of electromagnetic waves (electric field along x-axis).
Fig. 10 is a graph of the loss of the present invention when the electromagnetic wave is incident perpendicularly (electric field along x-axis).
Fig. 11 is a graph showing the reflectance when the electromagnetic wave is incident perpendicularly (the electric field is along the x-axis) at a temperature T of 350K according to the present invention.
The reference signs explain: 1-first layer copper surface, 2-second layer copper surface, 3-third layer copper surface, 4, 5-two layers of copper columns respectively embedded in two layers of intermediate medium substrates, 6, 7-two layers of intermediate medium substrates, 8-VO complementary to empty groove of second layer copper surface2And (3) pasting.
Detailed Description
The technical scheme of the present invention is further explained by combining the drawings and the specific embodiments as follows:
the design and principle of the high-efficiency transmission-type adjustable polarization converter based on the SIW technology are that the polarization converter is formed by periodically arranging unit structures, and the structure of the polarization converter comprises a first layer copper surface 1, a second layer copper surface 1, a third layer copper surface 2, a third layer copper surface 3, two layers of copper columns 4, 5 respectively embedded in two layers of intermediate medium substrates, two layers of intermediate medium substrates 6, 7 and VO (vacuum oxide) complementary to an empty groove on the second layer copper surface2The perspective view, the (3 × 3) array view and the side view of the patch 8, the polarization converter are shown in fig. 1, fig. 5 and fig. 6, respectively.
When electromagnetic waves are vertically incident (an electric field is along the x-axis direction) and T is 300K, under the joint work of three layers of copper surfaces, two layers of intermediate medium substrates and two layers of copper columns, transmission type cross polarization conversion can be achieved within 13.57-16.10GHz through reasonable parameter optimization, and then the temperature is raised to T which is 350K, so that VO is enabled to be VO2Exhibiting a metallic state, in which case the polarization transformer may be converted into a reflector.
The two layers of intermediate medium substrate materials of the polarization converter are RT/Duroid 3003, the dielectric constant is 3, and the loss tangent value is 0.002.
The relevant parameters of the polarization converter are shown in table 1.
| Parameter(s) | p | h | t | r11 |
| Value (mm) | 7.56 | 2.9 | 0.017 | 0.36 |
| Parameter(s) | g | a | b | r |
| Value (mm) | 0.945 | 4 | 1.8 | 1.26 |
| Parameter(s) | e | l | ||
| Value (mm) | 1.26 | 1.98 |
TABLE 1
FIG. 7 is a graph of the reflection amplitude of the polarization converter at normal incidence of the electromagnetic wave (electric field along the x-axis), where R isyxDenotes the cross-polarization reflection coefficient, RxxShows the co-polarization reflection coefficient, and the graph shows that the R is within the working frequency band (13.57-16.10GHz) under the high temperature stateyxAnd RxxAre all less than 0.2 and are close to 0 at the frequency points 13.8GHz, 14.8GHz and 15.8 GHz. FIG. 6 is a graph of the transmission amplitude of the polarization transformer at normal incidence of the electromagnetic wave (electric field along the x-axis), where TyxRepresents the cross-polarization transmission coefficient, TxxRepresents the co-polarized transmission coefficient, from which it can be seen that, in the operating band, TyxThe amplitude of (a) rises rapidly and the curves are all above 0.9, and TxxIs lower, with a value of less than 0.2. In summary, the polarization converter converts the incident wave in the x direction into the outgoing wave in the y direction through transmission in 13.57-16.10GHz, and a 90 ° polarization conversion effect is achieved. The engineering definition refers to a frequency band with a Polarization Conversion Rate (PCR) greater than 0.9 as an operating frequency band with a good polarization conversion effect, and the expression formula is as follows:
the performance of the polarization transformer will be demonstrated by describing its transmission polarization transformation ratio graph and loss plot at normal incidence of the electromagnetic wave (electric field along x-axis). As shown in fig. 9 and 10, when the polarization converter operates in the frequency band of 13.57-16.10GHz, its PCR is >0.9, and its loss is less than 0.1, which indicates that the polarization converter can perform transmissive cross-polarization conversion on most of the incident waves in the operating frequency band.
Fig. 10 is a graph showing the reflectivity of the polarization converter when T is 350K and the electromagnetic wave is incident perpendicularly (the electric field is along the x-axis), and fig. 10 shows that when the temperature is adjusted to T is 350K, the polarization converter is converted into a reflector in the operating frequency band (13.57-16.10GHz), and the total reflection of the incident wave can be realized.
Therefore, in summary, it can be considered that the efficient transmission-type tunable polarization converter based on the SIW technology can better realize the transmission-type cross polarization conversion in the frequency band of 13.57-16.10GHz, and can realize the functional conversion between the polarization conversion and the total reflection by adjusting the temperature.
After specific design, the utility model discloses can realize the conversion of efficient transmission-type cross polarization, the utility model has the advantages of the design is felt strong, the tunability is strong and the practicality is strong.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration only, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the claims and their equivalents.
Claims (8)
1. An efficient transmission-type adjustable polarization converter based on SIW technology is characterized in that: the polarization converter comprises a first layer of copper surface, a first layer of dielectric substrate, a first layer of metal column embedded in the middle of the first layer of dielectric layer, a second layer of copper surface and a VO (vacuum) complementary to the empty groove2The patch comprises a patch, a second layer of dielectric substrate, a second layer of metal column embedded in the middle of the second layer of dielectric substrate and a third layer of copper surface.
2. An efficient transmissive tunable polarization converter based on SIW technology according to claim 1, wherein: the empty groove part on the surface of the first layer of copper is in a Christmas tree shape, the branch part is formed by subtracting two circles from three rectangles with the same size, and the post part is formed by rectangles; the length a of the rectangle of the branch part is 4mm, the width b is 1.8mm, the center of the circle minus the circle is positioned at the end point of the rectangle, the radius r of the circle minus the circle is 1.26mm, the length l of the rectangle of the branch part is 1.98mm, the width e of the rectangle is 1.26mm, and the groove thickness is consistent with the copper surface thickness.
3. An efficient transmissive tunable polarization converter based on SIW technology according to claim 1, wherein: the other parameters of the empty groove on the surface of the second layer of copper are reduced by 0.8 times in comparison with the parameters of the empty groove on the surface of the first layer of copper, and the parameters of the empty groove on the surface of the third layer of copper are kept unchanged.
4. An efficient transmissive tunable polarization converter based on SIW technology according to claim 1, wherein: the thickness of the copper surfaces of the first layer, the second layer and the third layer is 0.017 mm.
5. An efficient transmissive tunable polarization converter based on SIW technology according to claim 1, wherein the empty trench of the first layer copper surface is along the y-axis direction, and the empty trenches of the second layer copper surface and the third layer copper surface are rotated counterclockwise by 45 ° and 90 ° with respect to the empty trench of the first layer copper surface, respectively.
6. An efficient transmissive tunable polarization converter based on SIW technology according to claim 1, wherein: the VO2The patch has a low temperature state and a high temperature state; when the temperature is lower than 68 ℃, the material is in a low-temperature state, the material has dielectric property and the conductivity of the material is 20S/m; when the temperature is higher than or equal to 68 ℃, the material is in a high-temperature state, and the material has a metal characteristic, and the electrical conductivity of the material is 200000S/m.
7. An efficient transmissive tunable polarization converter based on SIW technology according to claim 1, wherein: the column radius r of the first and second layers of metal columns110.36mm, 0.945mm between columns; each row and each column of each row are provided with 9 columns, and the height of each column is consistent with the thickness of the dielectric substrate.
8. An efficient transmissive tunable polarization converter based on SIW technology according to claim 1, wherein: the material of the two-layer dielectric substrate is RT/Duroid 3003, the dielectric constant is 3, the loss tangent value is 0.002, the thickness h is 2.9mm, and the unit period length p is 7.56 mm.
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