Microwave modulator on surface magnetostatic waves

FIELD: electricity.

SUBSTANCE: microwave modulator includes extended structure on the basis of magnon crystal from ferrite film, microstrip converters for excitation and reception in ferrite film of surface magnetostatic waves, which are arranged on opposite ends of structure, constant magnetic field source, element for control of distribution parameters of magnetostatic waves. Magnon crystal is made on the basis of film from yttrium iron garnet with surface periodic structure in the form of parallel grooves the depth of which is 0.01-0.2 of film and which are arranged perpendicular to axis of extended structure. Element for control of distribution parameters of magnetostatic waves is arranged on the side of grooves and represents metallic shield movable in the direction perpendicular to plane of periodic structure and connected to piezoelectric actuator connected to electric generator of modulating signal.

EFFECT: providing the possibility of controlling the rejection level of microwave signal in frequency band without control direct current flowing along metal film.

4 cl, 4 dwg

 

The invention relates to electrical engineering and can be used as a functional element for processing signals in a broadband microwave systems for various purposes.

It is known that devices on magnetostatic waves (MRV) and, in particular, on the surface of the MRV (PMSV)propagation in the ferrite film, promising for the purposes of processing of microwave signals in the range of tens to hundreds of GHz. Described various devices for this purpose, including the use of various regulatory elements that affect the performance of PSV. Thus, a known delay line on PMSV (US 4400669, J.D.Adam; M.R.Daniel; R.A.Moore, 1983), consisting of a magnetic film of yttrium-iron garnet (YIG) specified thickness, placed in a constant magnetic field, two transducers intended for excitation and reception of MRV in the film, and a metal screen placed between the input and output transducers. By selecting the gap between the surface of the magnetic film and the metal screen enhances the linearity of the dependence of the group delay with frequency. Known also design filters on the MRV resonator type and on the basis of the delay line (US 5017896, J.D.Adam; S.H.Talisa, 1991), in which the required fashion MRV stands out from the multimode signal by placing a metal screens on either side of the s from the film of YIG, in which MRV applies.

A device on MRV for processing signals at high frequencies (US 6356165, D.S.Jeon, et al, 2002), in which the metal layer included in the multilayer structure comprising the magnetic film, to improve isolation between the input and output transducers. It is also known device on the MRV with a specially selected distance between the ferrite film and positioned on either side of her metal screens (US 6114929, .Kurata, 2000), which increases the quality factor of the resonant filter.

A device for PSV (JP 2009003150, I.Mitsuteru, S.Hikariko, .Kenji, 2009 - the nearest equivalent), in which the surface of the YIG film between the input and output transducers of the MRV is periodic metal structure in the form of a meander, which allows you to control the length of magnetostatic waves.

The above device PSV have a common drawback - when selected, the value field of the bias is not provided, the function of the modulation signal. In other words, there is no possibility to control the frequency dependence of the level of transmission of the microwave signal in the operation.

Also known functional microwave devices for various purposes, using the so-called mignonne crystals as a medium for distribution PMSW (Saanichton, Wailevu, Slays cki, Eshalon, NCI, Ahistory. "Physical basis of filtering of microwave signals using magnonic crystals". // Collection of scientific papers "Heteromagnetic microelectronics. - 2008. - B.5. - P.78-86. Mignonne crystals represent the YIG film with etched surface structures in the form of grooves, the axis of which is perpendicular to the direction of propagation PMSV. The YIG film is placed between the input and output microstrip transducers microwave.

Closest to the patent is a modulator of the level of transmission of the microwave oven, including extensive structure-based mignonga crystal of ferrite films of YIG, microstrip transducers for excitation and reception of PMSV placed at opposite ends of the structure, the permanent magnetic field source element to control the parameters of the distribution PMSV - metal film in the form of a meander, which passed current (A.V.Chumak, .Neumann, ..Serga, .Hillebrands and ..Kostylev. "A current-controlled, dynamic magnonic crystal. // J.Phys. D.: 2009. - V.42. - P.205005 - the closest equivalent). The YIG film is etched patterns in the form of grooves, the axis of which is perpendicular to the direction of propagation PMSV. In the scattering PMSV on the surface of the periodic structure (periodically varying internal magnetic field arising from the transmission of the current IU is ndro) in the spectrum of the signal transmission there are streaks of nepomucene, the scope of rejectio the microwave signal.

However, to control the specified modulator UHF required transmission power value of 0.25 for the specified film in the form of a meander when the magnitude of the field bias 1600 E. that, as follows from the publication, provides at a frequency of 6.5 GHz level change transmission from -40 dB to the level of the boom -65 dB.

Patented modulator microwave on magnetostatic waves includes extensive structure-based mignonga crystal of ferrite film microstrip transducers for excitation and reception in a ferrite film surface magnetostatic waves, placed at opposite ends of the structure, the permanent magnetic field source element to control the parameters of the propagation of magnetostatic waves.

The difference invention is that magnonic crystal is made on the basis of the film from salesoutlook grenade with the surface of the periodic structure in the form of parallel grooves, a depth of 0.005-0.5 film thickness, placed perpendicular to the long axis of the structure. Element to control the parameters of the propagation of magnetostatic waves posted by grooves and represents a metal screen, movable in the direction perpendicular to the plane of the periodic structure and connected the output to piezo technology, connected to the electrical generator of the modulating signal.

The device can be characterized by the fact that the film of salesoutlook grenade has a thickness of 18-25 microns with a saturation magnetization 1600-1800 GS, the grooves have a period 170-230 μm, a width of 1.5-3.5 µm and a depth of 0.1 to 0.3 μm, and the permanent magnetic field source provides a tension not less than 700 E.

The device can be characterized and the fact that piezodrive made with the possibility of moving metal screen in the range from direct mechanical contact with the surface of the periodic structure and removing at least 200 microns, and the fact that the metal shield is made of nonmagnetic material film thickness of 6-8 μm on the substrate.

The technical result of the invention is the ability to control the level of rejectio the microwave signal in the frequency band without the need for flow control of DC on the metal film.

The invention is illustrated in the figures, where:

figure 1 shows the design of the modulator microwave on PMSV;

figure 2 - amplitude-frequency and phase-frequency characteristics in the absence of the influence of metal screen (t>200 μm);

figure 3 - amplitude-frequency and phase-frequency characteristics in the presence of metal screen (t=0);

4 is constructed on the basis of the former is elementarnykh measurements of the dispersion curves at t=500 μm (curve 1) and at t=0 (curve 2).

The device is presented in figure 1, where: 1 - the YIG film with a periodic surface structure forming a ferrite magnonic crystal; 2, 3 - input and output transducers PMSV; 4,5 - microstrip lines; 6 - non-magnetic adjusting element is a metal screen; 7 - piezodrive to move metal screen 6, is connected to an electrical generator modulating signal generator conventionally not shown); 8 - adjustable source of constant magnetic field. Double-arrow 9 shows the direction of movement of the screen 6, pos.10 - direction bias field.

Surface periodic structure is made on the YIG film 1 in the form of parallel grooves 11, the depth of which ranges from 0.005 to 0.5 film thickness 1. Grooves 11 are placed perpendicular to the long axis of the structure, the ends of which are converters 2, 3, connected to the path of the microwave through the strip lines 4, 5.

The YIG film has a thickness s in the range s=18-25 microns with a saturation magnetization 1600-1800 GS. The grooves 11 have a period d=170-230 μm, width w=1.5-3.5 µm and a depth of h=0.1 to 0.3 μm, and the permanent magnetic field source provides a tension not less than 700 E.

Non-magnetic adjusting element is a metal shield 6 may be made in the form of a film of gold, platinum or other good what about the conductive substances thickness of 6-8 μm, formed on the substrate. This substrate is connected with piezo technology 7, which provides the movement of the screen 6 in the range from direct mechanical contact with the surface of the periodic structure on the film 1, and remove from it, at least up to a distance of t>d=200 μm, where d is the period of the surface structure.

The device operates as follows. When connecting microstrip lines 4, 5 due to microwave tract, as a result of interaction PMSV incident on the grating and reflected from the grooves 11, the dispersion characteristic of the MRV f(q) arise forbidden zone, in which the amplitude-frequency characteristic of the delay line represent areas of nepomucene signal. The Central frequency bands nepomucene fn(i=1, 2,...n) correspond to the wave numbers PMSV qn=πn/d and can adjust with changes in the magnitude of the external magnetic field from the source 8. PMSV exists in the frequency range f0-f1>f0with increasing frequency loss on the distribution grow. The smaller the spacing of the grooves, the further first strip of rejectio separated from f0where losses are minimal. Because of the important modulator ratio of loss out of band of rejectio and in-band rejectee, for best results, period d, in which the first band is close to f0. When close is to the surface of the film 1 metal screen 6 of the dispersion dependence of f(q) changes. At frequencies fnthe condition qn-πn/d is no longer met, and the level of the transmission signal is increased to the value corresponding to the spread PMSV free film 1 YIG. Thus, at frequencies fnthe amplitude of the output signal can be controlled using the approximation (removal) metal screen, that is, to provide modulation of the output microwave signal and to control the level of rejectee. Unlike the closest analogue for this purpose does not require flow control DC on the metal film.

In figure 2, 3 shows experimental data of the amplitude-frequency and phase-frequency characteristics of the modulator microwave on PSV in the absence of metal screen (t>100 μm) and at its contact with the surface of the film 1(t=0), respectively. The YIG film had a thickness of s=22 μm, a saturation magnetization 1680 Gauss. The parameters of the surface structure h=0.2 μm, w=3 μm, d=200 μm. The magnitude of the constant magnetic field 800 E. it is Seen that in the band of 70 MHz with a center frequency 4310 MHz there is a change in level of the microwave signal is 15 dB to - 30 dB. The analysis shows that optimization of geometrical parameters of the structure should be expected that losses outside the stopband can be reduced to 7 dB, and the bandwidth boom increased to >50 dB.

Figure 4 shows based on the experience imentally measurements of the dispersion curves PMSV at t=0.5 mm (curve 1) and at t=0 (curve 2). It is seen that the approximation metal screen to the surface changes the frequency corresponding to q1-πn/d, with values of f1to a value of f2.

Thus, the data presented indicate the achievement of the technical result of the invention is to allow level control rejectee the microwave signal in the frequency band without the need for flow control of DC on the metal film. This option extends the feature set device spin waves, promising for processing microwave signals.

1. Modulator microwave on magnetostatic waves, including extensive structure-based mignonga crystal of ferrite film microstrip transducers for excitation and reception in a ferrite film surface magnetostatic waves, placed at opposite ends of the structure, the permanent magnetic field source element to control the parameters of the propagation of magnetostatic waves, characterized in that magnonic crystal is made on the basis of the film from salesoutlook grenade with the surface of the periodic structure in the form of parallel grooves, a depth of 0.005-0.5 film thickness, placed perpendicular to the long axis of the structure when the element to control the parameters which is hraneniya magnetostatic waves hosted by grooves and represents a metal screen, movable in the direction perpendicular to the plane of the periodic structure, and is associated with piezo technology, connected to the electrical generator of the modulating signal.

2. The modulator according to claim 1, characterized in that the film of salesoutlook grenade has a thickness of 18-25 microns with a saturation magnetization 1600-1800 GS, the grooves have a period 170-230 μm, a width of 1.5-3.5 µm and a depth of 0.1 to 0.3 μm, and the permanent magnetic field source provides a tension not less than 700 E.

3. The modulator according to claim 1, characterized in that piezodrive made with the possibility of moving metal screen in the range from direct mechanical contact with the surface of the periodic structure and removing at least 200 microns.

4. The modulator according to claim 1, characterized in that the metal shield is made of nonmagnetic material film thickness of 6-8 μm on the substrate.



 

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