RU209990U1 - MICROWAVE DEMULTIPLEXER - Google Patents

Abstract

The utility model relates to microwave radio engineering, in particular to devices using magnetostatic waves, and can be used as a microwave signal demultiplexer. The technical problem of the claimed utility model is the expansion of the functionality of demultiplexers on magnetostatic waves due to the possibility of controlling the output of spin waves. The technical result is the ability to control spin waves by changing the magnetization and the size of the iron-rhodium layer. To achieve a technical result, a microwave signal demultiplexer, containing a first rectangular-shaped microwave guide made of an yttrium iron garnet film with input and output converters of surface magnetostatic waves placed on a gallium-gadolinium garnet substrate, a second microwave guide made of iron-rhodium and located on the first microwave guide in its central part, perpendicular to the longitudinal axis of the first microwave guide, the source of the control external field, according to the utility model, the demultiplexer additionally contains a third, similar to the first, rectangular microwave guide made of an yttrium iron garnet film with output transducers of surface magnetostatic waves, which is also placed on a gallium-gadolinium substrate grenade and is oriented parallel to the first microwave guide, while the first and third microwave guides are placed laterally with a gap between them of 40 μm from the condition of ensuring the multimode coupling mode of magnetostatic waves, the length of the second microwave guide was chosen in the range from 50 to 150 μm, the saturation magnetization of the iron-rhodium layer was chosen from 40 to 215 KA/m. 6 ill.

Description

The utility model relates to microwave radio engineering, in particular to devices using magnetostatic waves, and can be used as a microwave signal demultiplexer.

The design of a nonlinear power divider of a microwave signal on spin waves is known (see RF patent No. 2666969, according to class IPC H01P 1/22, publ. 13.09.2018). The microwave guide structure of the divider is made on the basis of a film of yttrium iron garnet (YIG) in the form of two elongated strips of equal width, placed parallel to each other with a gap selected from the condition of ensuring the multimode coupling mode of magnetostatic waves. The ends of one strip of the microwave structure have taps on which microstrip antennas are formed for excitation and reception of magnetostatic waves, connected respectively with a single input port and the first output port.

The disadvantage of this device is the difficulty of creating identical waveguides.

Known demultiplexer on magnetostatic waves (see RF patent No. 2691981 according to class IPC G02F 1/00, pub. output microstrip antennas, magnetic field sources associated with controls. The device additionally comprises a third output microstrip antenna, the first microwave guide is placed directly on the substrate and is configured to excite a surface magnetostatic wave, the input and first output antennas being placed at opposite ends of the first microwave guide, the second microwave guide is fixed above the first microwave guide perpendicular to the last one and is installed with overlapping of their central parts with a gap enabling the surface magnetostatic wave to be pumped from the first microwave guide to the second one, wherein the second and third output antennas are placed at opposite ends of the second microwave guide to receive the reverse volume magnetostatic wave.

The disadvantage of this device is the inability to control the direction of the output signal.

Closest to the claimed is a microwave signal demultiplexer filter (see RF patent No. 2754086 according to class IPC H01P 1/218, pub. 08/26/2012), containing a rectangular yttrium iron garnet film placed on a gallium-gadolinium garnet substrate forming the first microwave guide with input and output converters of surface magnetostatic waves, the second microwave guide made of iron-rhodium and located on the film of yttrium iron garnet in its central part perpendicular to the longitudinal axis of the first microwave guide, the source of the controlling external magnetic field, while the height of the second the microwave guide is selected in the range from 3 to 500 microns, and the width of the first microwave guide is equal to the length of the second one.

The disadvantage of the device is the inability to redirect the spin-wave signal to different outputs.

The technical problem of the claimed utility model is the expansion of the functionality of demultiplexers on magnetostatic waves due to the possibility of controlling the output of spin waves.

The technical result is the ability to control spin waves by changing the magnetization and the size of the iron-rhodium layer.

To achieve a technical result, a microwave signal demultiplexer, containing a first rectangular microwave guide made of an yttrium iron garnet film placed on a gallium-gadolinium garnet substrate with input and output converters of surface magnetostatic waves, a second microwave guide made of iron-rhodium and located on the first microwave guide in its central part, perpendicular to the longitudinal axis of the first microwave guide, the source of the control external field, according to the utility model, the demultiplexer additionally contains a third, similar to the first, rectangular microwave guide made of an yttrium iron garnet film with output transducers of surface magnetostatic waves, which is also placed on a gallium-gadolinium substrate grenade and is oriented parallel to the first microwave guide, while the first and third microwave guides are placed laterally with a gap between them of 40 μm from the condition of ensuring the multimode coupling mode of magnetostatic waves, the length of the second microwave guide was chosen in the range from 50 to 150 μm, the saturation magnetization of the iron-rhodium layer was chosen from 40 to 215 KA/m.

The utility model is illustrated by drawings, which show:

in fig. 1 - the claimed structure of the demultiplexer;

in fig. 2 - structure in cross section;

in fig. 3 - amplitude-frequency characteristic of magnetostatic waves (MSW) propagating in YIG films at an iron-rhodium length of 50 μm and a saturation magnetization of 139 KA/m, obtained by numerical simulation;

in fig. 4 - amplitude-frequency characteristic of MSWs propagating in the structure under study, with an iron-rhodium length of 150 μm and a saturation magnetization of 139 KA/m, obtained by numerical simulation;

in fig. 5 - amplitude-frequency characteristic of MSWs propagating in the structure under study, with an iron-rhodium length of 50 μm and a saturation magnetization of 40 KA/m, obtained by numerical simulation;

in fig. 6 - amplitude-frequency characteristic of MSWs propagating in the structure under study, with an iron-rhodium length of 50 μm and a saturation magnetization of 215 KA/m, obtained by numerical simulation.

Positions in the drawings are indicated:

1 - substrate from a film of gallium-gadolinium garnet (GGG);

2 - the first microwave guide made of a film of yttrium iron garnet (YIG);

3 - the second microwave, made of a layer of iron-rhodium (IR);

4 - third microwave guide made of YIG film;

5 - input transducer of surface magnetostatic waves (MSW);

6, 7, 8 - output converters MSSV.

The source of the magnetic field in the drawings is not shown.

The microwave signal demultiplexer is a structure consisting of a substrate (GGG) 1, on which the first and third microwave guides 2 and 4 are located laterally from a film of yttrium iron garnet (YIG), having the shape of rectangles. Across the YIG film (perpendicular to the longitudinal axis of the first and third microwave guides) in the central part there is a second microwave guide 3 made of a film of antiferromagnetic material - iron-rhodium (IR). On the short sides of the microwave guides 2 and 4, the MSSV converters 5, 6, 7, 8 are placed. The structure is placed in a magnetic field.

The principle of operation of the demultiplexer is that the input microwave signal, the frequency of which should be in the frequency range determined by the magnitude of the external constant magnetic field, is fed to the input converter 5. Then the signal is converted into an MSW, propagating along the length of the YIG and pumping between the first and third microwave guides. Further, after passing, the ZhR modifies its characteristics. In this system, the redistribution of spin waves from one layer to another in different directions is observed.

With the help of magnetoelectric interaction, it is possible to carry out electrical frequency tuning in the structure between YIG and LR. This is possible due to the fact that materials based on iron-rhodium with variations in isotopes in the composition have a high magnetization in the ferromagnetic phase at low temperatures, and also have significant magnetoelectric, pyroelectric and piezoelectric effects that occur near the metamagnetic phase transition of the 1st order. An increase in temperature on the surface of the antiferromagnetic material 3 leads to an increase in its saturation magnetization and, as a result, a magnetoelectric effect occurs. An electric field arises, which leads to a change in the propagation of the MSSW along the length of the lateral waveguides. By varying the length of the LR layer, one can control its degree of influence on the SW dynamics in YIG (the effect also increases with increasing length). Consequently, in this demultiplexer, it is possible to control the propagation of spin waves using two regimes by changing the magnitude of the magnetization and the size of the LR film.

In FIG. Figure 3 shows the amplitude-frequency characteristic of the wave propagating in the first and third YIG-based microwave guides with a YR layer length of 50 μm and a saturation magnetization of 139 KA/m.

In FIG. Figures 4-6 show the results of the amplitude-frequency characteristic when the parameters of the LR layer change, this characteristic and the magnitude of the magnetic field change. In FIG. 4, the length of the LR d ₂ =150 μm and the saturation magnetization M=139 KA/m, the amplitude at the output transducers 6 and 7 decreased significantly by about 30 dB.

In FIG. 5-6, the length of the LHR d ₂ =50 μm and the saturation magnetization M=40 and M=215 KA/m, respectively, in the first case, the signal amplitudes at all output transducers are approximately equal, and in the second, the amplitude value at the output transducers 6, 7 is greatly reduced by about 20 dB.

In the example of a specific implementation of the substrate of gallium-gadolinium garnet (GGG) had the dimensions of Width x Length x Thickness=600×7000×500 (μm). On the surface of the substrate 1, the first and third microwave guides 2 and 4 (magnon crystal) are formed, respectively, based on films of yttrium iron garnet (YIG) with saturation magnetization M ₀ = 139 KA/m, having the shape of rectangles, on the short faces of which MSSV converters 6 are placed , 7, 8. On top of the YIG, there is a layer of antiferromagnetic material, iron-rhodium (IR), with a saturation magnetization ranging from 40 KA/m to 215 KA/m. Dimensions of the first and third microwave guides: length d ₁ = 7 mm, width w ₁ = 200 µm, height h ₁ = 10 µm, distance between them ∆w = 40 µm. The length of the second LR microwaveguide varies from 50 to 150 µm, width w ₂ = 200 µm, height h ₁ = 30 µm.

Thus, the presented data confirm the achievement of the technical result, namely the construction of a demultiplexer based on the yttrium iron garnet/iron-rhodium structure with the possibility of spatial mode selection and spin wave control by changing the magnetization and size of the iron-rhodium layer. Thus, the functionality of the device is expanded, which allow it to be used also for magnon logic devices and provide redirection of the information signal to different outputs, which determines the peculiarity of this device.

Claims (1)

A microwave signal demultiplexer, containing a first rectangular microwave guide made of an yttrium iron garnet film placed on a gallium-gadolinium garnet substrate with input and output converters of surface magnetostatic waves, a second microwave guide made of iron-rhodium and located on the first microwave guide in its central part perpendicular to the longitudinal axis of the first microwave guide, the source of the controlling external field, characterized in that the demultiplexer additionally contains a third, similar to the first, rectangular microwave guide made of an yttrium iron garnet film with output transducers of surface magnetostatic waves, which is also placed on a gallium-gadolinium garnet substrate and oriented parallel to the first microwave guide, while the first and third microwave guides are placed laterally with a gap between them of 40 μm from the condition of ensuring the mode of multimode coupling of magnetostatic waves, the length of the second microwave guide is selected in the range from 50 to 150 μm, and the saturation magnetization of the iron-rhodium layer is chosen from 40 to 215 KA/m.

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