RU210122U1 - SPACE-FREQUENCY FILTER ON MAGNETOSTATIC WAVES - Google Patents

Abstract

The utility model relates to radio engineering, in particular to microwave devices using magnetostatic waves. In a spatial-frequency filter based on magnetostatic waves, containing a substrate made of a film of gallium-gadolinium garnet, on which two identical microwave guides made of an yttrium iron garnet film directed at each other are located along the longitudinal axis with a gap, each of the microwave guides has a rectangular base, passing into a wedge-shaped section with a truncated top forming the end sides of the microwave guide, the section is formed by the side surfaces of the film with the same angles of inclination with respect to the base, the input microstrip antenna is located on one of the bases, and the output antenna is located on the other, in the gap formed by the end sides of the microwave guides, microresonator, the filter has a source of an external magnetic field, according to the utility model, a resonator 200 μm wide, 180 μm long is chosen as a microresonator, each microwave guide has a length of 3000 μm, and the angle of inclination of the side surface of the film to the base is 60°, while the source of the external magnetic field is configured to change the field value. EFFECT: providing the possibility of filtering the input signal at the frequency of the microresonator eigenmode while simplifying the design, the possibility of uniform control of the frequency passband of the MSSW by changing the external magnetic field. 3 ill.

Description

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

A filter is known, which is a tunable microwave filter, made on the basis of high-quality magnetoacoustic resonances excited in a layered structure: ferrite film - substrate - ferrite film, in which single-frequency filtering of the microwave signal occurs due to selective excitation of individual modes by magnetoacoustic resonance. The first and second ferrite films in the form of resonators are located on opposite sides of the non-magnetic substrate, the input and output magnetostatic wave converters (MSVs) are located coaxially with the ferrite films and at an angle of 90° to each other (see RF patent for invention RU 2390888, IPC H01P 1 /20, published on May 27, 2010).

The disadvantage of this device is the limited operating frequency range.

Known filter containing a dielectric plate, one surface of which is metallized, and on the opposite surface segments of extended conductive strips are applied, arranged in parallel and separated by dielectric gaps. The length of an extended flat dielectric plate is not less than the sum of the widths of all segments of the conductive strips and the gaps separating them, and the width of the extended strip of the plate is from 0.1 to 0.2 of the wavelength of the dielectric plate at the center frequency of the filter (see RF patent for invention No. 2534957 , IPC H01P 1/20, published 12/10/2014).

A filter is also known, containing a dielectric substrate suspended between the screens, on one side of which resonator conductors short-circuited to the screen from one edge of the substrate are applied, and strip conductors short-circuited to the screen from the other edge of the substrate are applied to the second side of the substrate. At the same time, the filter is configured to form attenuation poles near the attenuation band (see RF patent for invention No. 2659321, IPC H01P1/205, pub. 06/29/2018).

However, the disadvantage of devices according to patents of the Russian Federation No. 2534957 and No. 2659321 is the inability to control the properties of the wave spectrum by changing the control parameters and the complexity of their manufacture.

Closest to the claimed device is a spin-wave filter on magnetostatic waves, containing a substrate made of a film of gallium-gadolinium garnet (GGG), on which two identical wedge-shaped microwave guides from a film of yttrium iron garnet are located with a gap along the longitudinal axis (YIG).

Each of the microwave guides has a rectangular base, turning into a wedge-shaped section with a truncated top forming the end sides of the microwave guide, the section is formed by the side surfaces of the film with the same angles of inclination with respect to the base, the input microstrip antenna is located on one of the bases, and the output antenna is located on the other, in microresonators are located in the gap formed by the end sides of the microwave guides, the filter has a source of an external magnetic field. The filter is designed in such a way that a Fano-type resonance can be observed in a coupled system of spin wave resonators and a Fabry-Perot resonator (Grachev A.A., Beginin E.N., Martyshkin A.A., Khutieva A.B., Filchenkov I. O., Sadovnikov A.V., Nonlinear Fano resonance in a coupled system magnon microwaveguide - resonator // Izvestiya vuzov. PND 2021, vol. 29, no. 2021-29-2-254-271).

The disadvantage is the complexity of manufacturing such a structure with a large number of microresonators. The change in the resonant frequency band with a change in the saturation magnetization of the microresonators is carried out by heating them, which complicates the design.

The technical problem of the proposed utility model is the creation of a filter on magnetostatic waves with the ability to control the frequency range and bandwidth when changing the magnetic field without applying heat.

The technical result is to provide the possibility of filtering the input signal at the frequency of the microcavity eigenmode while simplifying the design.

To achieve a technical result in a spatial-frequency filter on magnetostatic waves, containing a substrate made of a film of gallium-gadolinium garnet, on which two identical microwave guides made of a film of yttrium iron garnet directed at each other are located along the longitudinal axis with a gap, each of the microwave guides has a rectangular base turning into a wedge-shaped section with a truncated top forming the end sides of the microwave guide, the section is formed by the side surfaces of the film with the same angles of inclination with respect to the base, the input microstrip antenna is located on one of the bases, and the output antenna is located on the other, in the gap formed by the end sides of the microwave guides, a microresonator is located, the filter has a source of an external magnetic field, according to the utility model, a resonator with a width of 200 μm and a length of 180 μm is selected as a microresonator, each microwave guide has a length of 3000 μm, and the angle of inclination of the side surface of the film and to the base is 60°, while the source of the external magnetic field is configured to change the magnitude of the field.

The source of the external magnetic field is oriented with respect to the plane of the substrate along the Y axis.

The utility model is illustrated by drawings, which show:

in fig. 1 - device design;

in fig. 2 - amplitude-frequency characteristic of the propagation of surface magnetostatic waves (MSW) in the structure;

in fig. 3 - amplitude-frequency characteristic of MSSW propagation in the structure at different values of the saturation magnetization M0 of the microresonator;

Positions in the drawings are indicated:

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

2 - microwave 1;

3 - microwave guide 2;

4 - microresonator;

5 - input microstrip antenna;

6 - output microstrip antenna;

7 - amplitude-frequency characteristic (AFC) of the structure without microresonator 4;

8 - amplitude-frequency characteristic of the structure with microresonator 4;

9 - amplitude-frequency characteristic of the structure at the saturation magnetization of the microresonator M0=0 gauss;

10 - amplitude-frequency characteristic of the structure at saturation magnetization of the microresonator M0=139 gauss.

The device (Fig. 1) is made on a substrate 1, which is a film of gallium-gadolinium garnet (GGG) with dimensions (W×D×T) 8000×4000×500 (μm). On the surface of the 1 GGG film, magnonic microwaveguide crystals 2, 3 directed at each other with saturation magnetization M0=1390 G and microresonator 4 with saturation magnetization M0=139 G are formed.

The width of the base of the microwave guides w1=2500 µm, the width of the surface of the truncated top of the conical part of the microwave guides w2=200 µm, the length of the microwave guides is 3000 µm.

Between the microwave guides 2 and 3 there is a microresonator 4 with a width equal to the width of the surface of the truncated top of the cone-shaped part w2=200 µm and a length of 180 µm. A gap g1=100 μm is made between the resonator and the microwave guides. On the magnonic crystal 2 there is an input transducer 5 for excitation of the MSS, on the magnonic crystal 3 there is a microstrip transducer 6 for receiving the MSS. The external magnetic field H0=2350 Oe is directed tangentially along the y-axis (see Fig. 1).

The device works as follows.

The input microwave signal, the frequency of which should lie in the frequency range determined by the magnitude of the external constant magnetic field, is fed to the input microstrip antenna 5. Next, the microwave signal is converted into an MSSW propagating along the microwave guide 2, which has the configuration of a magnonic crystal narrowing in width. Due to the dipole-dipole coupling, at a given gap g1, the energy of the MSSW is transferred to resonator 4, and after the MSSW it passes to waveguide 3.

In FIG. 2 shows the results of numerical simulation of the propagation process in this structure. The external magnetic field is oriented along the Y axis;. The frequency response of the structure without a microresonator is curve 7, the frequency response of the structure with a microcavity is curve 8. The addition of a microresonator to the system leads to an effect based on resonance arising from the interaction of propagating spin waves in irregular structures with microcavity modes, due to which a characteristic dip at the frequency appears on the frequency response about 5.35 GHz, corresponding to the frequency of the fundamental mode of the YIG microcavity.

In FIG. Figure 3 presents the results of numerical simulation of wave propagation in a functional element for different values of the saturation magnetization of the microresonator. AFC for the case when the saturation magnetization M0=0 G (curve 9) and AFC for the case when the saturation magnetization M0=139 G (curve 10). It can be seen from the presented results that, by changing the parameters of the magnetization of the system, in particular the magnetization of the microresonator, the system has the possibility of tuning the resonant frequency.

Thus, the presented data confirm the achievement of the technical result. Due to the implementation of a structure consisting of two identical magnonic crystals and a microresonator between them, it is possible to control the mode composition of the MSSW. In addition, with a change in the external magnetic field, the intensity of spin waves, and the saturation magnetization, it becomes possible to uniformly control the bandwidth of the MSSW frequencies.

Claims (1)

A space-frequency filter based on magnetostatic waves, containing a substrate made of a film of gallium-gadolinium garnet, on which two identical microwave guides made of an yttrium iron garnet film directed at each other are located along the longitudinal axis with a gap, each of the microwave guides has a rectangular base, turning into a wedge-shaped section with a truncated top forming the end sides of the microwave guide, the section is formed by the side surfaces of the film with the same angles of inclination with respect to the base, the input microstrip antenna is located on one of the bases, and the output antenna is located on the other, in the gap formed by the end sides of the microwave guides, a microresonator is located , the filter has a source of an external magnetic field, characterized in that a resonator with a width of 200 μm and a length of 180 μm is chosen as a microcavity, each microwave guide has a length of 3000 μm, and the angle of inclination of the side surface of the film to the base is 60°, while the source to the external magnetic field is made with the possibility of changing the magnitude of the field.

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