RU212555U1 - LOGIC DEVICE ON MAGNETOSTATIC WAVES - Google Patents

Abstract

The utility model relates to microwave radio engineering, in particular to devices using magnetostatic waves, and can be used as a demultiplexer. The technical result consists in improving the quality of the output signal by reducing signal distortion due to a different arrangement of interferometers in one layer instead of two and a smaller coupling area between the waveguides.

To achieve a technical result in a magnetostatic wave logic device containing two microwave guides, each of which is made in the form of a Mach-Zehnder interferometer and has a separator in the form of an octagonal hole, one of the microwave guides is placed on a substrate made of an yttrium iron garnet film and has a continuous part of the input converter of magnetostatic waves in the form of a microstrip antenna, each of the microwave guides is equipped with an output antenna, while the second microwave guide is also placed on a substrate of an yttrium iron garnet film laterally with respect to the first microwave guide, parallel and symmetrically to the first microwave guide with a gap of 10 μm between them. 5 ill.

Description

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

A logical device for signal processing is known (US 2007230858 G02B6/00, published 04.10.2007) having two optical channels located inside a semiconductor matrix. The optical splitter components are combined into a Mach-Zehnder interferometer configuration using two waveguide sections, also located in a semiconductor matrix. The device works by splitting forward and backward optical waves into two parts propagating along the first and second sections of the waveguide structure located inside the semiconductor matrix. At the output waveguide section, either a structurally combined first and second direct optical wave is obtained, or a destructively combined first and second optical wave.

The disadvantages of this device are the inability to control the frequency characteristics (tuning the frequency range).

A logical device is known (CN 10477934, H01L43/00, publ. 08/15/2017), based on the interference of spin waves - surface magnetostatic waves (MSWs) in a multiferroic material. The logic device consists of five functional zones, namely, a spin wave excitation zone, a spin wave frequency separation zone, an electric field regulation and control zone, a spin wave interference zone, and a spin wave detection zone. The functioning of the logical device is provided through the transmission medium of the spin wave, the regulation of the dispersion relation of the spin waves in the medium, the direction of the transmission of the spin wave and the change in the model in the case of an external magnetic field or a change in the internal field.

The disadvantage of this device is a complex design that requires the introduction of an additional piezoelectric layer to control the electric field.

A logical device based on magnetostatic waves is known (see RF patent 2690020, IPC H01P1 / 20, publ. 05/30/5019), containing a microwave guide made of an yttrium iron garnet (YIG) film placed on a substrate, having a bifurcated middle part, input and output placed on the solid parts of the microwave guide transducers of magnetostatic waves, controls, source of external magnetic field. The bifurcated part of the microwave guide is made in the form of a Mach-Zehnder interferometer, the input and output converters of magnetostatic waves in the form of microstrip antennas are placed at the ends of the solid parts of the microwave guide, the external magnetic field is directed tangentially to the YIG film, while the control elements are made in the form of means for changing the magnetization of the indicated YIG film by its local heating on the bifurcated parts of the microwave.

The disadvantage of the device is the shape of the separation hole, leading to some distortion of the signal in the middle part of the structure.

Closest to the claimed is a logical device on magnetostatic waves (see RF patent No. 2754126 according to IPC class H01P1 / 22, pub. 08/27/2021), containing two microwave guides made in the form of a Mach-Zehnder interferometer, having a separator in the form of an octagonal hole form, one of the microwave guides is placed on a substrate made of a film of yttrium iron garnet (YIG). On the solid parts of the microwave guides there are input and output converters of magnetostatic waves in the form of microstrip antennas. The logic device contains a source of an external magnetic field directed tangentially to the microwave guide. The second microwave guide is located above the first one, and the microwave guides are separated by a dielectric layer, and the second microwave guide is equipped with an output antenna located above the output antenna of the first microwave guide, while the external magnetic field source is configured to change the magnitude and polarity of the magnetic field.

The disadvantage of the logical device is the complexity of creating a multilayer ferromagnetic structure and placing antennas on such a device.

The technical problem of the claimed utility model is the expansion of the arsenal of logical devices based on magnetostatic waves with the function of a demultiplexer based on a system of coupled spin-wave interferometers, which will allow simple signal control by changing the magnitude of the external magnetic field.

The technical result consists in improving the quality of the output signal by reducing signal distortion due to a different arrangement of interferometers in one layer instead of two and a smaller coupling area between the waveguides.

To achieve a technical result in a magnetostatic wave logic device containing two microwave guides, each of which is made in the form of a Mach-Zehnder interferometer and has a separator in the form of an octagonal hole, one of the microwave guides is placed on a substrate made of an yttrium iron garnet film and has a continuous part of the input converter of magnetostatic waves in the form of a microstrip antenna, each of the microwave guides is equipped with an output antenna, the device contains an external magnetic field source that can change the magnitude and polarity, according to the utility model, the second microwave guide is also placed on a substrate of yttrium iron garnet film laterally with respect to to the first microwave guide, parallel and symmetrical to the first microwave guide with a gap between them of 10 µm

The utility model is illustrated by drawings, which show:

figure 1 is a schematic representation of the proposed device, General view;

in fig. 2 – structure of laterally coupled microwave guides on a substrate, in cross section;

in fig. 3 – schematic representation of the structure, top view;

in fig. 4 – excitation spectra of spin waves on different output transducers;

in fig. 5 – distribution map of the z-component of magnetization in the structure.

Positions in the drawings are: input 1 and output 2.3 transducers of magnetostatic waves (antennas); 4 - microwave guides having the configuration of a Mach-Zehnder interferometer from a YIG film; 5 - holes; 6 - non-magnetic substrate; 7 – direction of the external magnetic field; 8 – spectrum of excitation of spin waves, obtained on the output transducer 2; 9 – spectrum of excitation of spin waves, obtained on output transducer 3.

Overall dimensions of the structure: length l = 3500 µm, width w = 3010 µm, thickness d = 510 µm. The width of the waveguide in the input part and in the arms of the interferometers pl is 500 μm.

The device contains a substrate 6, which is a film of gallium-gadolinium garnet (GGG) with dimensions (WxLxT) 500 μm × 3500 μm × 3010 μm. On the surface of the GGG film 6 there is a structure formed from two laterally connected microwave guides 4 based on a YIG film with a thickness of 10 μm and a saturation magnetization M ₀ =139 gauss, having the configuration of a Mach-Zehnder interferometer. The gap between the interferometers is 10 μm in the middle part of the structure. Microstrip antennas 1, 2, 3 with a width of 30 μm are located on the microwave guides 4, which provide reception and excitation of the MSSW. In this case, the input antenna 1 is located at one end of the solid part of one microwave guide, the output antenna 2 is located at the other end of this microwave guide, the output antenna 3 is located at the other end of the solid part of the other microwave guide. The external magnetic field H _o is directed tangentially to the microwave guides along the y axis.

The device works as follows.

The input microstrip antenna 1 receives an input signal with a frequency depending on the magnitude of the constant external magnetic field. Then this signal is converted into a surface magnetostatic wave (MSW), which runs along both microwave guides 4 having the configuration of a Mach-Zehnder interferometer and made in the form of an irregular structure with holes 5. Due to the splitting of the MSW into two parts in the region of the octagonal hole of each microwave, either destructive or constructive interference of the MSSW is observed in the output part of the structure. The signal demultiplexing function is implemented due to the so-called sagging magnetic field in the middle part of the structure, where the gap between the microwave guides is minimal. When the MSS is excited only at input 1, the signal propagates to both output antennas 2 and 3.

In FIG. 3 schematically depicts laterally connected microwave guides, top view. The dimensions indicated in the figure make it possible to achieve the most optimal passage of spin waves along the structure with the least number of signal reflections, while keeping the overall dimensions of the device compact. The device itself will have two layers with a gap of 10 microns between them. This gap value ensures optimal signal transfer between layers due to the sagging field.

In FIG. Figure 4 shows the excitation spectra of spin waves in a system of two interferometers at outputs 2 and 3 when a wave is excited at input 1. There is a noticeable difference in the signal amplitude at different outputs, the maxima and minima of the spectrum at output 2 are shifted relative to the maxima and minima of the spectrum at output 3. in the frequency range 5.3 - 5.6 GHz, the maximums of the graph for output 2 roughly correspond to the minima of the graph for output 3.

In FIG. Figure 5 shows the amplitude distribution of the z-component of magnetization for a system of two laterally coupled YIG interferometers at a frequency of 5.5 GHz. Due to the sagging magnetic field in the middle part of the structure, the wave excited in one of the interferometers propagates in both interferometers.

Thus, the presented results confirm the achievement of the technical result - signal demultiplexing based on a system of coupled spin-wave interferometers with the ability to control the frequency range and bandwidth by exposure to a static magnetic field.

Claims (1)

Logic device on magnetostatic waves, containing two microwave guides, each of which is made in the form of a Mach-Zehnder interferometer and has a separator in the form of an octagonal hole, one of the microwave guides is placed on a substrate made of an yttrium iron garnet film and has an input converter of magnetostatic waves located on its solid part in the form of a microstrip antenna, each of the microwave guides is equipped with an output antenna, characterized in that the second microwave guide is also placed on a substrate of yttrium iron garnet film laterally with respect to the first microwave guide, parallel and symmetrical to the first microwave guide with a gap of 10 μm between them.

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