WO2005050839A1 - 電気機械フィルタ - Google Patents
電気機械フィルタ Download PDFInfo
- Publication number
- WO2005050839A1 WO2005050839A1 PCT/JP2004/017246 JP2004017246W WO2005050839A1 WO 2005050839 A1 WO2005050839 A1 WO 2005050839A1 JP 2004017246 W JP2004017246 W JP 2004017246W WO 2005050839 A1 WO2005050839 A1 WO 2005050839A1
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- WIPO (PCT)
- Prior art keywords
- magnetic field
- electromechanical filter
- signal line
- magnetic
- electromechanical
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02244—Details of microelectro-mechanical resonators
- H03H9/02393—Post-fabrication trimming of parameters, e.g. resonance frequency, Q factor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02244—Details of microelectro-mechanical resonators
- H03H2009/02488—Vibration modes
- H03H2009/02496—Horizontal, i.e. parallel to the substrate plane
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02244—Details of microelectro-mechanical resonators
- H03H2009/02488—Vibration modes
- H03H2009/02511—Vertical, i.e. perpendicular to the substrate plane
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02244—Details of microelectro-mechanical resonators
- H03H2009/02488—Vibration modes
- H03H2009/02519—Torsional
Definitions
- the present invention relates to an electromechanical filter, and more particularly, to an electromechanical filter including an electrode serving as a signal line, a magnetic field generating unit, and a mechanism that makes them movable.
- Non-Patent Document 1 describes a filter using a magnetic material.
- an Fe / GaAs substrate hybrid microstrip line in which a microstrip line of a ferromagnetic film containing Fe is formed on a GaAs substrate, and a 10 GHz band is utilized by utilizing a ferromagnetic resonance phenomenon.
- a band stop filter of! / The ferromagnetic resonance frequency f of this bandstop filter is expressed as in Equation 1.
- ⁇ is the gyromagnetic constant- ⁇ — 1 ]
- g is the Lande factor
- H is the anisotropic magnetic field (A / m)
- I is the saturation magnetic field (T)
- H is the DC bias.
- Equation 2 the anisotropic magnetic field H is given by Equation 2.
- the ferromagnetic resonance frequency when H is zero is about 9.85 GHz.
- the ferromagnetic resonance frequency can be modulated, and a tunable filter can be realized.
- Equation 1 is a formula when the high-frequency magnetic field due to the stripline current and the magnetic moment due to the DC bias magnetic field are orthogonal to each other. When the high-frequency magnetic field and the magnetic moment are in the same direction, no ferromagnetic resonance occurs. It is also necessary to pay attention to the vector of the DC bias magnetic field H.
- Non-Patent Document 1 E. Schloemann et al .: J. Appl. Phys., 63, 3140 (1998).
- Non-Patent Document 1 is characterized in that when a material is deposited such that the axis of easy magnetization of the magnetic material is orthogonal to the high-frequency magnetic field, then the DC bias magnetic field is applied. There is a problem that the size and direction of the field H cannot be changed, and a tunable filter cannot be realized.
- a large magnetic field applying device was used to control the magnetization direction and size of the magnetic material to achieve a tunable filtering effect.
- such a mechanism is a small device such as a portable terminal. Not applicable to equipment.
- a coil for applying a magnetic field is used, a current flows and power consumption is increased. Therefore, application to a mobile terminal is also unsuitable in this aspect. Even in view of such situation, the technology of Non-Patent Document 1 has a problem that it is difficult to realize a tunable filter applicable to a mobile terminal.
- the present invention has been made in view of the above circumstances, and provides a tunable filter capable of modulating a small passband (bandpass frequency) or a cutoff band (bandstop frequency) with low power consumption.
- the purpose is to:
- an electrode serving as a signal line, a magnetic field generating unit, and a mechanism for making them movable are provided, so that only a signal of a predetermined frequency can be selected and output, and
- An object of the present invention is to provide an electromechanical filter capable of modulating a predetermined frequency.
- the ferromagnetic resonance frequency is modulated by relatively vector-modulating a high-frequency magnetic field caused by a current flowing through a signal line and an intersecting DC bias magnetic field.
- the electromechanical filter of the present invention is formed so that an electrode serving as a signal line, a drive electrode disposed so as to face the electrode, and a vector displaceable relatively by an electric field generated between these electrodes. And / or any of these electrodes or any of the magnetic field generators is movable, and selects only a signal of a predetermined frequency from signals flowing through the signal line. And can modulate a predetermined frequency.
- the technology of the present invention for mechanically displacing the electrodes and the magnetic field generating unit includes a beam formed by MEMS (Micro Electro Mechanical Systems) technology, a beam, or an electrode provided on the beam. This is realized by a circuit unit having an electromechanical effect and a magnetic field generating unit.
- MEMS Micro Electro Mechanical Systems
- the electromechanical filter of the present invention includes: a conductor serving as a signal line; a magnetic field generating unit that generates a magnetic field penetrating the conductor; and a relative position between the conductor and the magnetic field generating unit being displaced.
- the magnetic field penetrating the signal line can be changed by changing the conductor, the drive electrode, or the magnetic field generating part by changing the electrostatic force by the drive electrode, and the ferromagnetic resonance frequency can be easily changed. Can be adjusted.
- the conductor is disposed so as to face the drive electrode. And electrodes that can be relatively displaced by electrostatic force between the driving electrodes.
- the signal line can be easily displaced by using a doubly supported beam or the like, and the ferromagnetic resonance frequency can be easily adjusted only by adjusting the potential applied to the drive electrode, thereby enabling modulation.
- An electromechanical filter can be formed.
- the magnetic field generating unit includes a magnetic body formed to be displaceable.
- the direction of the magnetic field can be easily changed, and thus a modulatable electromechanical filter can be formed.
- the magnetic field generator is movable, the signal line can be fixed, and a signal line having a desired thickness can be formed on the surface of the substrate. This makes it possible to form an electromechanical filter having a high density.
- the signal transmission line itself is fixed, the reliability becomes higher.
- the magnetic body is displaced by an electrostatic force of the drive electrode.
- the magnetic body can be easily displaced only by changing the potential of the drive electrode, and a magnetic field change can be easily realized, so that a modulatable electromechanical filter can be formed. .
- the electromechanical filter of the present invention includes a filter in which the drive electrode is movable.
- the degree of freedom in design can be increased. If the drive electrode is movable, the signal line can be fixed, and the magnetic field generating portion can be further displaced by the drive electrode displaced by the interaction with the signal line.
- the electromechanical filter of the present invention is formed on a substrate surface and has a drive electrode configured to have a variable electric potential, and is arranged on the drive electrode so as to face each other at a predetermined interval, and a signal line is provided.
- a magnetic field generator having a magnetic film pattern magnetized so as to have a magnetic field component intersecting with the signal line, and changing the potential of the drive electrode, The magnetic resonance frequency is changed by displacing the signal line and changing the magnetic field due to the magnetic film non-turn on the signal line.
- the drive electrode is constituted by a conductor pattern formed on an insulating film covering a semiconductor substrate surface, and the signal line is arranged so as to face the drive electrode.
- the doubly supported beam is constructed.
- the signal line is arranged in parallel with the drive electrode, and the magnetic film pattern is arranged in a direction orthogonal to a signal flowing through the signal line. Create a magnetic field.
- the magnetic film pattern includes first and second magnetic film patterns arranged so as to sandwich the signal line.
- the magnetic body can be displaced in two horizontal directions, and the modulation can be controlled with higher precision.
- the magnetic field generating portion composed of a magnetic film pattern formed on the surface of the substrate and the magnetic film pattern can be displaced to face each other at a predetermined interval.
- a drive electrode disposed close to the signal line, and the magnetic film pattern is magnetized so as to have a magnetic field component crossing the signal line. Then, by changing the potential of the drive electrode, the signal line is displaced, and the magnetic field by the magnetic film pattern on the signal line is changed, thereby changing the magnetic resonance frequency. I have.
- the magnetic pattern is formed on an insulating film covering a surface of the semiconductor substrate, and the signal line is opposed to the magnetic pattern.
- the doubly-supported beam arranged in is constructed.
- the signal line is arranged in parallel with the drive electrode, and the magnetic film pattern is arranged in a direction orthogonal to a signal flowing through the conductor pattern. Including those that form a magnetic field.
- the drive electrode includes first and second conductive film patterns arranged so as to sandwich the signal line.
- the magnetic body can be displaced in two horizontal directions, and the modulation can be controlled with higher precision.
- a magnetic field generating portion formed of a magnetic film pattern formed on the surface of the substrate so as to be spatially displaceable, and a predetermined distance from the magnetic film pattern
- a conductor pattern that is fixedly arranged on the substrate so as to face each other, and constitutes a signal line; and a drive electrode that is arranged close to the magnetic field generator and that can displace the magnetic field generator.
- the body film pattern is magnetized so as to have a magnetic field component intersecting with the signal line, and changes the signal line by changing the potential of the drive electrode, thereby changing the magnetic material on the signal line. Changing the magnetic field according to the film pattern, which includes changing the magnetic resonance frequency.
- the electromechanical filter of the present invention also includes an electromechanical filter in which the signal lines are formed so as to face each other at a predetermined interval on the magnetic pattern.
- the electromechanical filter of the present invention is configured such that the first and second drive electrodes formed on the substrate surface and configured to have a variable electric potential are spaced apart from each other by a predetermined distance. And a magnetic field generating section provided with a magnetic film pattern magnetized so as to have a magnetic field component intersecting the signal line.
- the position of the magnetic field and the position of the signal line can be changed by the first and second drive electrodes, respectively, so that more accurate modulation can be performed.
- the electromechanical filter according to the present invention includes a first conductor serving as a signal line, a magnetic field generating unit that generates a magnetic field penetrating the first conductor, and a relative position between the first conductor and the magnetic field generating unit.
- a driving electrode that changes a magnetic field penetrating the signal line by displacing the position; and an induced electromotive force induced by resonance between a magnetic field generated by a high-frequency current flowing through the first conductor and a magnetic field of the magnetic field generating unit.
- a second conductor serving as a signal line for transmitting power.
- This high-frequency magnetic field excites spin precession in the magnetic field generating section (Kittel mode).
- An induced electromotive force is generated in the first conductor by the magnetic field created by this mode. Only when the signal of the ferromagnetic resonance frequency of the magnetic field generating section is input, the ferromagnetic resonance phenomenon occurs, the angle of the precession of the spin of the magnetic field generating section becomes maximum, and the magnitude of the induced electromotive force becomes maximum. It becomes.
- the second conductor outputs a signal by the induced electromotive force, and only a signal of a specific frequency determined by the ferromagnetic resonance frequency can propagate to the second conductor.
- the first conductor and the second conductor are arranged so as to be orthogonal to each other.
- the first conductor and the second conductor may be separated by a predetermined distance. They are arranged in parallel with a gap.
- the electromechanical filter of the present invention also includes an electromechanical filter in which a plurality of the electromechanical filters are arranged and connected to realize a tunable bandpass filter function.
- the electromechanical filter of the present invention includes one in which a plurality of the electromechanical filters are arranged and connected to realize a tunable band stop filter function.
- an electrode serving as a signal line, a magnetic field generating unit, and a mechanism for making them movable it is possible to select and pass only a signal of a predetermined frequency. Can be output so as to be cut off, and a predetermined frequency can be modulated.
- FIG. 1 (a) a perspective view showing a configuration of an electromechanical filter according to Embodiment 1 of the present invention, (b) a cross-sectional view showing a configuration of an electromechanical filter according to Embodiment 1 of the present invention,
- FIG. 2 is a diagram showing tunable filtering characteristics of the electromechanical filter according to Embodiment 1 of the present invention, where (a) is a diagram showing bandstop characteristics and (b) is a diagram showing bandpass characteristics.
- FIG. 3 (a) is a perspective view showing a modification of the electromechanical filter of FIG. 1, and (b) is a cross-sectional view showing a modification of the electromechanical filter of FIG.
- FIG. 4 shows a simulation result of a generation pattern of a DC bias magnetic field H formed by two magnetic bodies 102
- FIG. 7 is a cross-sectional view for explaining step by step the manufacturing process of the electromechanical filter according to Embodiment 1 of the present invention.
- FIG. 8 is a step-by-step description of a process of manufacturing an electromechanical filter according to Embodiment 1 of the present invention.
- FIG. 9 (a) is a perspective view showing a configuration of an electromechanical filter according to Embodiment 2 of the present invention.
- FIG. 10 (a) is a perspective view illustrating a configuration of an electromechanical filter according to Embodiment 3 of the present invention, and (b) is a cross-sectional view illustrating a configuration of an electromechanical filter according to Embodiment 3 of the present invention.
- FIG. 12 (a) is a perspective view illustrating a configuration of an electromechanical filter according to Embodiment 4 of the present invention, and (b) is a cross-sectional view illustrating a configuration of an electromechanical filter according to Embodiment 4 of the present invention.
- FIG. 13 is a diagram showing a DC bias magnetic field and a relative position of a movable electrode when a magnetic body and a movable electrode are moved.
- FIG. 14 is a perspective view showing a configuration of an electromechanical filter according to Embodiment 5 of the present invention.
- FIG. 15 is a perspective view showing a configuration of a modification of the electromechanical filter according to Embodiment 5 of the present invention.
- FIG. 1 (a) and 1 (b) are a perspective view and a sectional view showing a configuration of an electromechanical filter according to Embodiment 1 of the present invention.
- a magnetic field generating unit that generates a magnetic field penetrating the signal line is arranged with respect to the signal line, and the relative position between the signal line and the magnetic field generating unit is displaced by electrostatic force.
- the ferromagnetic resonance frequency can be modulated by modulating the ferromagnetic resonance frequency by changing the magnetic field that penetrates the line and relatively modulating the high-frequency magnetic field generated by the current flowing through the signal line and the DC bias magnetic field that intersects.
- a band stop filter is configured by absorbing a signal of a specific frequency among the signals flowing through the movable electrode 101.
- a gallium arsenide (GaAs) substrate having an insulating film 106 formed of a two-layered film of silicon oxide and silicon nitride formed on the surface thereof 107, two posts 104 are provided so as to protrude, and are bridged between the posts 104 to form a movable electrode 101 forming a doubly supported beam; a signal input port IN for inputting a signal to the movable electrode 101; A signal output port OUT for outputting a signal from the electrode 101 to the outside is provided.
- GaAs gallium arsenide
- a drive electrode 103 is provided below the movable electrode 101 so as to face the movable electrode 101, and the movable electrode 101 is moved downward by an electrostatic force generated by a potential difference between the movable electrode 101 and the drive electrode 103. It is configured to be displaceable.
- a magnetic body 102 is provided at a position separated by a predetermined distance from the movable electrode 101 so that a DC bias magnetic field H is applied to the movable electrode 101.
- the magnetic body 102 is applied via a spacer 105 to apply a desired DC noise magnetic field H to the movable electrode 101 and to be provided at a position optimized relative to the displacement range of the movable electrode 101. It is provided on a GaAs substrate 107.
- FIG. 1B is a cross-sectional view illustrating a configuration of the electromechanical filter according to Embodiment 1 of the present invention.
- the signal input from the signal input port IN propagates to the movable electrode 101 and is output to the signal output port OUT.
- the movable electrode since the movable electrode is located in the DC bias magnetic field H where the magnetic substance 102 comes, signal filtering by the ferromagnetic resonance phenomenon occurs, and only a signal of a specific frequency determined by the ferromagnetic resonance frequency is output to the signal output port. Transfer to OUT Can be carried.
- a signal having a ferromagnetic resonance frequency is absorbed, and a signal having a frequency other than the ferromagnetic resonance frequency is transmitted.
- a tunable function is added in addition to the signal filtering function.
- the ferromagnetic resonance frequency f needs to be variable.
- the DC bias magnetic field H Should be variable.
- a DC bias magnetic field ⁇ is radially generated from the magnetic body 102.
- the movable electrode which is a signal line, passes through the DC bias magnetic field ⁇ . 101 can be moved.
- the moving direction of the movable electrode 101 is indicated by VI.
- FIGS. 2A and 2B are diagrams showing tunable filtering characteristics of the electromechanical filter according to the first embodiment.
- a band-pass filter characteristic and a band-stop filter characteristic are shown as an application example of the electromechanical filter of the present invention, but by connecting the electromechanical filter of the present invention in series, a band-pass filter as shown It is also possible.
- the center frequency f of the filtering the frequency can be modulated to a lower frequency side f ′ and a higher frequency side f ′′.
- the initial state of the magnetic body 102 is important.
- the axis of easy magnetization determined by the deposition conditions of the magnetic film and the direction of magnetization performed by applying an external magnetic field after the deposition of the magnetic material 102 need to be from the magnetic material 102 to the movable electrode 101.
- a relative position such as a distance and a height between the movable electrode 101 and the magnetic body 102, and the movable electrode 101 and the drive electrode are displaced.
- the shape such as the distance from the pole 103 and the thickness and width of the magnetic material 102 for generating the desired DC bias magnetic field H needs to be optimized according to the required tunable filter characteristics.
- the electromechanical filter 100 only a signal of a predetermined frequency can be selected and output, and the predetermined frequency can be modulated.
- FIGS. 3 (a) and 3 (b) are a perspective view and a sectional view showing a modification of the electromechanical filter according to Embodiment 1 of the present invention.
- one magnetic material 102 Generates a DC bias magnetic field H different from that of the electromechanical filter 100 by arranging the two magnetic bodies to face each other with the movable electrode 101 interposed therebetween.
- FIG. 3 (b) shows that the DC noise magnetic field H force is generated so as to cross the movable electrode 101 so that the force is apparent. In this case, it is necessary to control and easily magnetize the easy axis so that the two magnetic bodies 102 are also magnetized in the same direction.
- FIG. 4 is a simulation result of a generation pattern of a DC bias magnetic field H formed by two magnetic bodies 102.
- X indicates the horizontal direction to the substrate surface
- z indicates the direction perpendicular to the substrate surface.
- the length direction is the X direction.
- the directions of the magnetizations M of the two magnetic members 102 are the same as the X direction, and the lines of magnetic force generated from the respective magnetic members 102 are combined to form a DC bias magnetic field H pattern.
- the curve represents the magnetic field lines, and the shade of color represents the intensity of the DC bias magnetic field H. The darker the magnetic field lines are, the brighter the color is the stronger the DC bias magnetic field H is.
- the ferromagnetic resonance frequency Calculate the tuning range of wave number f f and resonance frequency.
- the ferromagnetic resonance frequency is also expressed as in the above equation 1.
- ⁇ is the gyromagnetic constant (1.105 X 10 5 g [A- 's-, g: Lande factor)
- H is an anisotropic magnetic field (A / m)
- I is the saturation magnetic field (T)
- H is a DC bias magnetic field is there.
- a voltage is applied between the movable electrode 101 and the drive electrode 103, and the movable electrode 101 is moved downward by an electrostatic force.
- a tuning range of about 1 GHz can be realized with a displacement of the movable electrode 101 of about 20 / zm.
- a region where the relationship between the position and the DC bias magnetic field H is linear may be used.
- a region where the relationship between the position and the DC bias magnetic field H is gentle may be used. In this case, the controllability of the resonance frequency can be improved.
- the ferromagnetic resonance frequency can be modulated, and a tunable filter can be realized.
- FIG. 3B is an example, various DC bias magnetic fields H can be formed by changing the number and position of the magnetic material.
- the behavior of the magnitude of the DC bias magnetic field H with respect to the position is significantly different from that of Fig. 5. It is feasible. (This specific example is described in Embodiment 2.)
- the size of the movable electrode 101 is set to about 45 m, which is 50 ⁇ m or less, so that the movable electrode 101 can penetrate between the two magnetic bodies 102, and to reduce the panel force so that a large displacement can be obtained at a low voltage.
- a high aspect ratio of 0.7 ⁇ m in thickness and 500 ⁇ m in length is possible.
- the movable electrode 101 may be displaced only above the magnetic body 102, the size is not necessarily limited to this.
- the driving method is not limited to the electrostatic force driving, and it is possible to use a piezoelectric power driving, a Lorentz force driving, or the like that does not depend on the distance between the movable electrode 101 and the driving electrode 103. It is also possible to provide a mechanism for fixing the movable electrode 101 at a predetermined position, and it is possible to use electrostatic force driving, piezoelectric power driving, Lorentz force driving, or the like as a driving method of the mechanism.
- the same components as those of the electromechanical filter 100 described in the first embodiment have the same names and the same reference numerals and description thereof will be omitted.
- FIGS. 7A to 7I are cross-sectional views illustrating step by step the steps of manufacturing an electromechanical filter according to Embodiment 1 of the present invention.
- an insulating film 106 composed of a two-layer film of an oxidized silicon film and a silicon nitride film is formed on a substrate 107 such as a GaAs substrate. Further, an oxide silicon film 105a as a spacer material to be the spacer 105 is formed thereon by sputtering.
- a patterned photoresist 301 is formed by photolithography.
- the 105a is dry-etched, and the photoresist 301 is removed by asking. in this way After the photoresist 301 is removed, the silicon oxide film 105a on the substrate 107 becomes a spacer 105 as shown in FIG. 7 (c).
- the magnetic body 102 is formed.
- a magnetic thin film 102a of Fe, Co, Ni, etc. is deposited on the spacer 105 and the insulating film 106 by sputtering, and a magnetic pattern is formed thereon by photolithography.
- Photoresist 302 is formed.
- the magnetic thin film 102a is dry-etched, and the photoresist 302 is removed by asking to form the magnetic body 102 on the spacer 105 as shown in FIG. 7 (e).
- the drive electrode 103 is formed.
- the entire surface of the substrate on which the magnetic body 102 and the insulating film 106 are formed is formed.
- a metal thin film 103a such as A1 or A1 is deposited by sputtering, and a photoresist 303 patterned into a drive electrode pattern is formed thereon by photolithography.
- the metal thin film 103a is dry-etched, and the photoresist 303 is removed by asking to form the magnetic body 102 on the spacer 105 as shown in FIG. 7 (g).
- the movable electrode 101 is formed.
- a photoresist 304 patterned in a sacrificial layer pattern is formed on the magnetic body 102, the drive electrode 103, and the insulating film 106.
- a metal thin film such as A1
- a photoresist 305 patterned on a movable electrode pattern is formed thereon by photolithography.
- the metal thin film 101a is dry-etched, and the photoresist 304 is removed by asking to form a movable electrode 101 having a hollow structure as shown in FIG. 7 (i).
- the insulating film 106 may not be provided if it is guaranteed that a high-frequency signal propagating through the movable electrode 101 serving as a signal line will not propagate to the substrate 107 and cause a large loss.
- a coil can be formed in place of the magnetic body 102 to generate a similar DC bias magnetic field H.
- the bias magnetic field H may be variable or an AC bias magnetic field.
- a plurality of drive electrodes 103 are provided in which the number of drive electrodes 103 is one and the movable electrode 101 constituting the signal line is vertically movable in one direction.
- V 1 can be used in multiple directions!
- FIGS. 9 (a) and 9 (b) are a perspective view and a sectional view showing a configuration of an electromechanical filter according to Embodiment 2 of the present invention.
- a plurality of drive electrodes 103 and a plurality of moving directions VI of the movable electrode 101 are provided, and the magnetic body is disposed on the substrate surface so as to be located directly below the movable electrode 101. It was formed. That is, drive electrodes 103 are formed on both sides of the movable electrode 101 constituting the signal line, and a magnetic body 102 is disposed directly below the signal line so that a magnetic field is applied in a direction perpendicular to the substrate. It is.
- a movable electrode 101 bridged between posts 104 and a movable electrode 101 are formed on a substrate 107 having an insulating film 106 formed on its surface.
- a signal input port IN for inputting a signal and a signal output port OUT for outputting a signal from the movable electrode 101 to the outside are provided.
- drive electrodes 103 are provided so as to sandwich the movable electrode 101, and the movable electrode 101 is horizontally moved by an electrostatic force generated by a potential difference between the movable electrode 101 and the drive electrode 103. It moves in two directions VI.
- the driving electrode 103 is provided on a substrate 107 via a spacer 108 in order to provide a desired driving force to the movable electrode 101 and to be provided at a position optimized relative to the movable electrode 101.
- a magnetic body 102 for applying a DC bias magnetic field H to the movable electrode 101 is provided below the movable electrode 101.
- the DC bias magnetic field H moves from the horizontal direction and the movable electrode 101 moves in the vertical direction.
- the DC bias magnetic field H is in the vertical direction, and the moving direction of the movable electrode 101 is in the horizontal direction.
- the electromechanical filter 100 and the electromechanical The shape of the DC bias magnetic field H, which is difficult to realize with the structure and the manufacturing method, and the moving direction and the moving range of the movable electrode 101 moving in the DC bias magnetic field H are realized by changing the structure.
- FIG. 9 (b) is a cross-sectional view illustrating a configuration of the electromechanical filter according to Embodiment 2 of the present invention.
- carbon nanotubes are used.
- the signal input from the signal input port IN propagates to the movable electrode 101 and is output to the signal output port OUT.
- the movable electrode since the movable electrode is located in the DC bias magnetic field H where the magnetic substance 102 comes, the signal filtering by the ferromagnetic resonance phenomenon occurs, and only the signal of a specific frequency determined by the ferromagnetic resonance frequency is output. Can propagate to port OUT.
- a tunable function is added in addition to the signal filtering function.
- the DC bias magnetic field H in Equation 1 indicating the ferromagnetic resonance frequency f It should be variable.
- a DC bias magnetic field H is generated radially from the magnetic body 102.
- the signal line can be used in the DC bias magnetic field H.
- the moving electrode 101 is movable.
- the moving direction of the movable electrode 101 is indicated by VI.
- the center frequency and the tunable range of the filter characteristics depend on the magnitude and the vector of the DC bias magnetic field H in the displacement range of the movable electrode 101, the axis of easy magnetization by the deposition condition of the magnetic material 102, The direction of magnetization by the external magnetic field after the deposition of the magnetic body 102 needs to be the direction of the force from the magnetic body 102 to the movable electrode 101.
- the movable electrode 101 1S moves in the desired DC bias magnetic field H
- the relative position such as the distance and height between the movable electrode 101 and the magnetic body 102, the distance between the movable electrode 101 and the drive electrode 103, the desired
- the shape, such as the thickness and width, of the magnetic body 102 for generating the DC bias magnetic field H needs to be optimized according to the required tunable filter characteristics.
- the electromechanical filter 400 only the signal of the predetermined frequency is selected, It is possible to output and to be able to modulate a predetermined frequency.
- the method of manufacturing the electromechanical filter 100 and the electromechanical filter 100a in the first embodiment differs from the method of manufacturing the electromechanical filter 100a in that the magnetic thin film 102a is replaced by a metal thin film 103a such as A1, and the metal thin film 103a is replaced by Fe, Co,
- the manufacturing and the manufacturing method can be made common.
- a coil can be formed as a magnetic field generating unit instead of the magnetic body 102 to generate a similar DC bias magnetic field H.
- the DC bias magnetic field H can be generated by using a variable inductor based on MEMS technology. It is also possible to use a variable or AC bias magnetic field.
- the number of the driving electrodes 103 is two and the movable electrode 101 is movable in two horizontal directions.
- only one of the driving electrodes 103 is one and the moving direction VI of the movable electrode 101 is one. May be set in one of the directions.
- the number of drive electrodes 103 is two and the movable electrode 101 is movable in two horizontal directions.
- the number of drive electrodes 103 is plural, and the moving direction VI of movable electrode 101 is plural directions. You may.
- carbon nanotubes facilitates formation of fine beams with good workability and high accuracy.
- FIGS. 10 (a) and (b) are a perspective view and a sectional view showing a configuration of an electromechanical filter according to Embodiment 3 of the present invention.
- a substrate having an insulating film 106 formed on the surface is provided.
- the magnetic body 102 is provided on the stem 109.
- Drive electrodes 110 for moving the magnetic body 102 are provided below both sides of the magnetic body 102.
- the magnetic body 102 moves in two directions by the electrostatic force generated by the potential difference between the magnetic body 102 and the drive electrode 110.
- the DC bias magnetic field H is fixed and the movable electrode 101 is movable.
- the DC bias magnetic field H is movable, and the movable electrode 101 is the fixed electrode 111.
- the bridge is formed in a bridge shape.However, the fixed electrode 111 can be formed with a thicker beam to avoid fluctuations. Can be improved.
- the shape of the DC bias magnetic field H which is difficult to realize with the structure and the manufacturing method of the electromechanical filter 100, the electromechanical filter 100a, and the electromechanical filter 400 in the first and second embodiments, and the position in the DC bias magnetic field H,
- the relative position of the fixed electrode 111 which is a signal line, is realized by changing the structure.
- the fixed electrode is formed in a bridge shape.
- the fixed electrode is formed of a conductor pattern formed on the surface of the substrate, and a stem 109 made of an insulating material is formed thereon. It is also possible to form a movable magnetic body pattern using the stem 109 as a fulcrum in the same manner as shown in FIGS. 10 (a) and 10 (b).
- a fixed electrode is formed on the stem in a self-aligning manner to reduce the photolithographic effect and to reduce the magnetic material.
- the drive electrode (fixed electrode) can be arranged close to the pattern, so that the electrostatic force can be increased and the occupied area can be reduced.
- FIG. 10 (b) is a cross-sectional view showing a configuration of the electromechanical filter according to Embodiment 3 of the present invention.
- FIG. 2 is a longitudinal sectional view illustrating a configuration of an electromechanical filter using carbon nanotubes.
- the signal input from the signal input port IN propagates to the fixed electrode 111 and is output to the signal output port OUT.
- the movable electrode is located in the DC bias magnetic field H where the magnetic substance 102 comes, signal filtering by the ferromagnetic resonance phenomenon occurs, and only a signal of a specific frequency determined by the ferromagnetic resonance frequency is output to the signal output port. Transfer to OUT Can be carried.
- a tunable function is added in addition to the signal filtering function.
- the DC bias magnetic field H in Equation 1 indicating the ferromagnetic resonance frequency f It should be variable.
- a direct current bias magnetic field H is radially generated from the magnetic body 102.
- the relative position between the DC bias magnetic field H and the fixed electrode 111 serving as the signal line is made variable.
- the moving direction of the magnetic body 102 is denoted by V2.
- FIG. 11 is a diagram showing a relative position between the DC noise magnetic field H and the fixed electrode 111 when the magnetic body 102 moves. It can be seen that the vector (direction ⁇ magnitude) of the DC bias magnetic field H passing through the fixed electrode 111 changes.
- the direction and magnitude of the DC bias magnetic field penetrating the fixed electrode can be made variable, and the ferromagnetic resonance frequency can be changed.
- the center frequency and tunable range of the filter characteristics depend on the magnitude and direction of the DC bias magnetic field H in the displacement range of the magnetic body 102, and therefore, the axis of easy magnetization due to the deposition conditions of the magnetic body 102 and the magnetic body 102
- the magnetization direction by the external magnetic field after the deposition needs to be from the magnetic body 102 to the fixed electrode 111.
- the relative position between the fixed electrode 111 and the magnetic body 102 such as the distance and height, and the magnetic force for generating the desired DC bias magnetic field H
- the shape, such as the thickness and width, of the body 102 needs to be optimized according to the required tunable filter characteristics.
- the electromechanical filter 500 it is possible to select and output only a signal of a predetermined frequency and to enable modulation of a predetermined frequency.
- a coil is formed instead of the magnetic body 102 as a magnetic field generating unit, and a similar DC bias magnetic field H can be generated. It is also possible to make the DC bias magnetic field H variable or an AC bias magnetic field by using a conductor.
- the number of drive electrodes 110 is two, and the magnetic body 102 is rotatable in two directions.
- only one drive electrode 110 is provided, and the direction of movement of magnetic body 102 is one.
- V2 can be used in either direction.
- the number of drive electrodes 110 is two and the magnetic body 102 is rotatable in two directions.
- the number of drive electrodes 110 may be plural and the moving direction V2 of the magnetic substance may be plural. .
- FIGS. 12 (a) and 12 (b) are a perspective view and a sectional view showing a configuration of an electromechanical filter according to Embodiment 4 of the present invention.
- a driving electrode 110 for driving the magnetic body 102 in the horizontal direction with electrostatic force is added to the structure of the third embodiment
- a movable electrode 101 bridged between posts 104, a signal input port IN for inputting a signal to the movable electrode 101, and a movable electrode 101 are formed on a substrate 107 having an insulating film 106 formed on a surface thereof.
- a signal output port OUT for outputting a signal to the outside is provided.
- a magnetic body 102 for applying a DC bias magnetic field H to the movable electrode 101 is provided below the movable electrode 101.
- the magnetic body 102 is provided on the stem 109.
- Drive electrodes 110 for moving the magnetic body 102 are provided below both sides of the magnetic body 102.
- the drive electrodes 110 move in two directions of rotation of the magnetic body 102 due to an electrostatic force generated by a potential difference between the magnetic body 102 and the drive electrode 110. It has become.
- a drive electrode 103 is provided so as to sandwich the drive electrode 110.
- the movable electrode 110 is driven by an electrostatic force generated by a potential difference between the movable electrode 110 and the drive electrode 103. 110 moves in two horizontal directions.
- the drive electrode 103 is provided on a substrate 107 via a spacer 108 in order to provide a desired drive force to the movable electrode 101 and to be provided at a position optimized relative to the movable electrode 110.
- the DC bias magnetic field H As described above, in the electromechanical filter 100, the electromechanical filter 100a, the electromechanical filter 400, and the electromechanical filter 500 in Embodiment 1, Embodiment 2, and Embodiment 3, the DC bias magnetic field H, Alternatively, while either the movable electrode 101 or the fixed electrode 111 serving as a signal line is movable, the DC mechanical magnetic field H and the movable electrode 101 are both movable in the electromechanical filter 600 according to the fourth embodiment. . As described above, it is difficult to realize the structure and manufacturing method of the electromechanical filter 100, the electromechanical filter 100a, the electromechanical filter 400, and the electromechanical filter 500 in the first, second, and third embodiments. The shape of the DC bias magnetic field H and the relative positions of the movable electrode 101 and the magnetic body 102, which are signal lines located in the DC bias magnetic field, are realized by changing the structure
- FIG. 12 (b) is a cross-sectional view illustrating a configuration of an electromechanical filter according to Embodiment 4 of the present invention.
- FIG. 2 is a longitudinal sectional view illustrating a configuration of an electromechanical filter using carbon nanotubes.
- the signal input from the signal input port IN propagates to the movable electrode 101 and is output to the signal output port OUT.
- the movable electrode since the movable electrode is located in the DC bias magnetic field H where the magnetic substance 102 comes, the signal is filtered by the ferromagnetic resonance phenomenon, and the signal of a certain frequency is absorbed by the ferromagnetic resonance frequency, and the remaining specific Only frequency signals can be propagated to the signal output port OUT.
- a tunable function is added in addition to the signal filtering function.
- the DC bias magnetic field H in Equation 1 indicating the ferromagnetic resonance frequency f It should be variable.
- a DC bias magnetic field H is radially generated from the magnetic body 102.
- the relative position between the DC bias magnetic field H and the movable electrode 101 serving as a signal line is variable.
- the moving direction of the magnetic body 102 is denoted by V2.
- the signal line is provided in the DC bias magnetic field H.
- the movable electrode 101 can move at the same time.
- the moving direction of the movable electrode 101 is indicated by VI.
- FIG. 10 is a diagram showing a relative position between the DC bias magnetic field H and the movable electrode 101 when the magnetic body 102 and the movable electrode 101 move.
- a comparison between FIG. 13 and FIG. 12 (b) shows that the vector and magnitude of the DC noise magnetic field H passing through the movable electrode 101 have changed.
- the magnitude of the vector ⁇ of the DC bias magnetic field passing through the fixed electrode can be made variable, and the ferromagnetic resonance frequency can be changed.
- the center frequency and the tunable range of the filter characteristics depend on the magnitude of the DC bias magnetic field H in the displacement range of the magnetic material 102 and the movable electrode 101 and on the vector, and therefore, depend on the deposition conditions of the magnetic material 102.
- the direction of magnetization by the magnetic axis and the external magnetic field after deposition of the magnetic material 102 needs to be from the magnetic material 102 to the movable electrode 101.
- a relative position such as a distance and a height between the movable electrode 101 and the magnetic body 102 and a desired DC bias magnetic field H are generated.
- the shape, such as the thickness and width, of the magnetic body 102 needs to be optimized according to the required tunable filter characteristics.
- the electromechanical filter 600 it is possible to select and output only a signal of a predetermined frequency and to enable modulation of a predetermined frequency.
- a coil can be formed as a magnetic field generating unit instead of the magnetic body 102 to generate a similar DC bias magnetic field H.
- the DC bias magnetic field H can be varied or It is also possible to use an AC bias magnetic field.
- the number of drive electrodes 110 is two, and the magnetic body 102 is rotatable in two directions.
- only one drive electrode 110 is provided, and the direction of movement of magnetic body 102 is one.
- V2 can be used in either direction.
- Embodiment 4 two drive electrodes 103 are provided, and movable electrode 101 is movable in two horizontal directions. However, one drive electrode 103 is provided and one of them is provided. May be set in either direction. [0117] Further, in Embodiment 4, the number of drive electrodes 110 is two and the magnetic body 102 is rotatable in two directions. However, the number of drive electrodes 110 is plural, and the moving direction V2 of the magnetic body is plural directions. Is also good.
- the number of the driving electrodes 103 is two and the movable electrode 101 is movable in two horizontal directions.
- the number of the driving electrodes 103 is plural and the moving direction VI of the movable electrode 101 is plural directions. good.
- FIG. 14 is a perspective view showing a configuration of an electromechanical filter according to Embodiment 5 of the present invention.
- the force that stops a signal propagating through one signal line at a specific frequency by ferromagnetic resonance and outputs the signal is output.
- the induced electromotive force of the input signal causes This is to realize signal modulation.
- a high-frequency magnetic field is generated around the fixed electrode 111 as a signal line by a high-frequency current, and the high-frequency magnetic field excites the precession of spins excited in the magnetic body 102, and the ferromagnetic resonance phenomenon causes
- the magnetic field of these signal lines and the signal line for output are placed in the area where the magnetic field due to the precession of spin of the magnetic material 102 can be received.
- a fixed electrode 112 is disposed so that a signal can propagate to the signal output port OUT only when the induced electromotive force generated by resonance is equal to or larger than a predetermined magnitude. Form a bandpass filter.
- a fixed electrode 111 and a signal input port IN for inputting a signal are provided on a substrate 107 having an insulating film 106 formed on a surface thereof.
- a magnetic body 102 is provided above the fixed electrode 111, and the magnetic body 102 is provided on a stem 109.
- Driving electrodes 110 for displacing the magnetic body 102 are provided below both sides of the magnetic body 102. It is moving in two directions.
- a fixed electrode 112 bridged between the posts 104 and a signal output port OUT for outputting a signal from the fixed electrode 112 to the outside are provided above the magnetic body 102.
- the magnetic body 102 is sandwiched between fixed electrodes 111 and 112, and the fixed electrode 112 is arranged so as to be orthogonal to the fixed electrode 111. Is placed.
- the signal input from the signal input port IN propagates to the fixed electrode 111, and generates a high-frequency magnetic field around the fixed electrode 111 due to a high-frequency current.
- the high frequency magnetic field excites spin precession in the magnetic material 102 (Kittel mode).
- An induced electromotive force is generated in the fixed electrode 112 by the magnetic field generated by this mode. Only when a signal of the ferromagnetic resonance frequency of the magnetic substance 102 is input, the ferromagnetic resonance phenomenon occurs, the angle of precession in the magnetic substance 102 becomes maximum, and the magnitude of the induced electromotive force also becomes maximum. Therefore, signal filtering is performed, and only a signal of a specific frequency determined by the ferromagnetic resonance frequency can propagate to the signal output port OUT.
- a tunable function is added in addition to the signal filtering function.
- the DC bias magnetic field H in Equation 1 indicating the ferromagnetic resonance frequency f It should be variable.
- a DC bias magnetic field H is generated radially from the magnetic body 102.
- the magnetic body 102 is movable, the relative position between the DC bias magnetic field H and the fixed electrode 111 serving as a signal line is variable.
- the moving direction of the magnetic body 102 is indicated by V2.
- the magnitude of the vector ⁇ of the DC bias magnetic field passing through the fixed electrode can be made variable, and the ferromagnetic resonance frequency can be changed.
- the center frequency and tunable range of the filter characteristics depend on the magnitude and direction of the DC bias magnetic field H in the displacement range of the magnetic body 102, and therefore, the axis of easy magnetization due to the deposition conditions of the magnetic body 102 and the magnetic body 102
- the direction of magnetization by the external magnetic field after the deposition needs to be in the direction from the magnetic body 102 to the fixed electrode 111.
- the relative position of the fixed electrode 111 and the magnetic body 102, such as the distance and height, and the magnetic material for generating the desired DC bias magnetic field H 1 It is necessary to optimize the shape such as thickness and width of 02 according to the required tunable filter characteristics.
- electromechanical filter 700 of the present embodiment it is possible to select and output only a signal of a predetermined frequency and to enable modulation of a predetermined frequency.
- the rotation of the magnetic body 102 in the axial direction is realized.
- the stem into a thin pole shape formed perpendicular to the substrate surface, and to be rotatable in all directions with this pole as a fulcrum.
- the magnetic body 102 has a circular pattern centered on the pole. Furthermore, a large number of fixed electrodes as drive electrodes are arranged around the pole.
- the rotation of the magnetic body 102 can be controlled by controlling the potential of each fixed electrode.
- the induced electromotive force is prevented from being directly excited by the fixed electrode 112 due to the magnetic field generated by the signal input to the fixed electrode 111.
- An electromechanical filter in which the fixed electrodes 111 and the fixed electrodes 112 in which the electrodes 112 are arranged so as to be orthogonal to each other are arranged in parallel at an interval where no correlation occurs.
- FIG. 12 is a perspective view showing a configuration of a modification of the electromechanical filter according to Embodiment 5 of the present invention.
- a fixed electrode 111 and a signal input port IN for inputting a signal are provided on a substrate 107 having an insulating film 106 formed on the surface.
- a magnetic body 102 is provided above the fixed electrode 111, and the magnetic body 102 is provided on a stem 109 made of silicon or the like.
- Drive electrodes 110 for moving the magnetic body 102 are provided below both sides of the magnetic body 102.
- the electrostatic force generated by the potential difference between the magnetic body 102 and the drive electrode 110 causes the magnetic body 102 to rotate in two directions. It seems to move to.
- the fixed electrodes 112 are arranged below the magnetic body 102 in parallel at a certain interval without being affected by the fixed electrodes 111 and the magnetic field generated by the fixed electrodes 111. From the fixed electrode 112, a signal output port OUT for outputting a signal to the outside is provided.
- the signal input from the signal input port IN propagates to the fixed electrode 111, and generates a high-frequency magnetic field around the fixed electrode 111 due to a high-frequency current.
- the high frequency magnetic field excites spin precession in the magnetic material 102 (Kittel mode).
- the spin wave propagates from the fixed electrode 111 side to the fixed electrode 112 side.
- an induced electromotive force is generated in the fixed electrode 112 by the magnetic field created by this mode.
- a tunable function is added in addition to the signal filtering function.
- the DC bias magnetic field H in Equation 1 indicating the ferromagnetic resonance frequency f It should be variable.
- a DC bias magnetic field H is generated radially from the magnetic body 102.
- the magnetic body 102 is movable, the relative position between the DC bias magnetic field H and the fixed electrode 111 serving as a signal line is variable.
- the moving direction of the magnetic body 102 is indicated by V2.
- the magnitude of the vector ⁇ of the DC bias magnetic field penetrating the fixed electrode can be made variable, and the ferromagnetic resonance frequency can be changed.
- the center frequency and tunable range of the filter characteristics depend on the magnitude and vector of the DC bias magnetic field H in the displacement range of the magnetic body 102, the axis of easy magnetization depending on the deposition conditions of the magnetic body 102 and the deposition of the magnetic body 102 The subsequent magnetization direction by the external magnetic field needs to be from the magnetic body 102 to the fixed electrode 111.
- the relative position between the fixed electrode 111 and the magnetic body 102, such as the distance and height, and the magnetic force for generating the desired DC bias magnetic field H It is necessary to optimize the shape such as the thickness and width of the body 102 according to the required tunable filter characteristics. is there.
- the electromechanical filter 800 it is possible to select and output only a signal of a predetermined frequency and to enable modulation of a predetermined frequency.
- a coil can be formed as a magnetic field generating unit instead of the magnetic body 102 to generate a similar DC bias magnetic field H.
- the DC bias magnetic field H can be changed or AC can be changed. It is also possible to use a bias magnetic field.
- the number of the drive electrodes 110 is two, and the magnetic body 102 is rotatable in two directions.
- the one drive electrode 110 is one, and the moving direction V2 of the magnetic body 102 is different. Good for one direction.
- Embodiment 5 two drive electrodes 110 are provided, and magnetic body 102 is rotatable in two directions. However, a plurality of drive electrodes 110 are provided, and a moving direction V2 of the magnetic body is provided in a plurality of directions. Is also good.
- the electromechanical filter of the present invention can provide a modulatable electromechanical filter with small size and low power consumption, and is effective as a discrete element. Needless to say, it is possible to provide a semiconductor integrated circuit device which can be integrated with other circuit elements and has a small and highly reliable filter with small transmission loss.
- a silicon substrate not only a silicon substrate but also a compound semiconductor substrate such as GaAs, etc., may be used if an electrode material or a magnetic film material is selected so as to be compatible with a substrate to be used. Integration with circuit elements is extremely easy.
- an oxidized silicon film, a silicon nitride film, and the like are used for the insulating film 106 covering the substrate surface and the insulating film serving as a spacer. It can be a film or a laminated film of these!
- a carbon nanotube can be applied in each embodiment.
- the electromechanical filter which concerns on this invention can make the direction and magnitude
- it is useful as an electromechanical filter with a tunable function.
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- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/578,040 US7397326B2 (en) | 2003-11-19 | 2004-11-19 | Electromechanical filter |
CN2004800392962A CN1902818B (zh) | 2003-11-19 | 2004-11-19 | 电动机械滤波器 |
EP04818972.4A EP1686689A4 (en) | 2003-11-19 | 2004-11-19 | Electromechanical filter |
Applications Claiming Priority (4)
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JP2003389832 | 2003-11-19 | ||
JP2003-389832 | 2003-11-19 | ||
JP2004-319355 | 2004-11-02 | ||
JP2004319355A JP4593239B2 (ja) | 2003-11-19 | 2004-11-02 | 電気機械フィルタ |
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WO2005050839A1 true WO2005050839A1 (ja) | 2005-06-02 |
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PCT/JP2004/017246 WO2005050839A1 (ja) | 2003-11-19 | 2004-11-19 | 電気機械フィルタ |
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US (1) | US7397326B2 (ja) |
EP (1) | EP1686689A4 (ja) |
JP (1) | JP4593239B2 (ja) |
CN (1) | CN1902818B (ja) |
WO (1) | WO2005050839A1 (ja) |
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JP4611127B2 (ja) * | 2004-06-14 | 2011-01-12 | パナソニック株式会社 | 電気機械信号選択素子 |
US7629192B2 (en) * | 2005-10-13 | 2009-12-08 | International Business Machines Corporation | Passive electrically testable acceleration and voltage measurement devices |
FR2920754B1 (fr) * | 2007-09-07 | 2010-06-18 | St Microelectronics Sa | Micro systeme comprenant une poutre deformable par flexion et procede de fabrication |
FR2929464B1 (fr) * | 2008-03-28 | 2011-09-09 | Commissariat Energie Atomique | Nano resonnateur magnetique |
JP5389950B2 (ja) | 2010-01-20 | 2014-01-15 | 株式会社東芝 | スピン波デバイス |
KR102042014B1 (ko) * | 2013-05-03 | 2019-11-08 | 엘지이노텍 주식회사 | 멤스 자계 센서 |
US20180309046A1 (en) * | 2015-09-30 | 2018-10-25 | Tdk Corporation | Magnetoresistive effect device |
JP6511532B2 (ja) * | 2015-09-30 | 2019-05-15 | Tdk株式会社 | 磁気抵抗効果デバイス |
US10145906B2 (en) | 2015-12-17 | 2018-12-04 | Analog Devices Global | Devices, systems and methods including magnetic structures |
CN114659625B (zh) * | 2022-03-17 | 2023-04-25 | 电子科技大学 | 基于石墨烯机械振子的性能可调辐射热计及制备方法 |
Citations (3)
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JPH01114111A (ja) * | 1987-10-27 | 1989-05-02 | Yokogawa Electric Corp | メカニカルフィルター |
JPH0252514A (ja) * | 1988-08-17 | 1990-02-22 | Yokogawa Electric Corp | メカニカルフィルター |
JP2003309449A (ja) * | 2002-02-13 | 2003-10-31 | Matsushita Electric Ind Co Ltd | 微小機械振動フィルタ |
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US5836203A (en) * | 1996-10-21 | 1998-11-17 | Sandia Corporation | Magnetically excited flexural plate wave apparatus |
US6348846B1 (en) * | 1999-10-14 | 2002-02-19 | International Business Machines Corporation | Filter circuit including system for tuning resonant structures to change resonant frequencies thereof |
FR2811163B1 (fr) * | 2000-06-30 | 2002-10-04 | Centre Nat Rech Scient | Filtre nono-electromecanique |
WO2002088764A1 (en) * | 2001-04-26 | 2002-11-07 | The Johns Hopkins University | Lorentz force driven mechanical filter/mixer designs for rf applications |
SG106612A1 (en) * | 2001-05-29 | 2004-10-29 | Sony Electronics Singapore Pte | A force sensing device |
FR2826645B1 (fr) * | 2001-07-02 | 2004-06-04 | Memscap | Composant microelectromecanique |
FR2828186A1 (fr) * | 2001-08-06 | 2003-02-07 | Memscap | Composant microelectromecanique |
JP4602130B2 (ja) * | 2004-04-28 | 2010-12-22 | パナソニック株式会社 | 電気機械フィルタ |
JP4611127B2 (ja) * | 2004-06-14 | 2011-01-12 | パナソニック株式会社 | 電気機械信号選択素子 |
-
2004
- 2004-11-02 JP JP2004319355A patent/JP4593239B2/ja not_active Expired - Fee Related
- 2004-11-19 WO PCT/JP2004/017246 patent/WO2005050839A1/ja not_active Application Discontinuation
- 2004-11-19 US US10/578,040 patent/US7397326B2/en active Active
- 2004-11-19 CN CN2004800392962A patent/CN1902818B/zh active Active
- 2004-11-19 EP EP04818972.4A patent/EP1686689A4/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH01114111A (ja) * | 1987-10-27 | 1989-05-02 | Yokogawa Electric Corp | メカニカルフィルター |
JPH0252514A (ja) * | 1988-08-17 | 1990-02-22 | Yokogawa Electric Corp | メカニカルフィルター |
JP2003309449A (ja) * | 2002-02-13 | 2003-10-31 | Matsushita Electric Ind Co Ltd | 微小機械振動フィルタ |
Non-Patent Citations (1)
Title |
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See also references of EP1686689A4 * |
Also Published As
Publication number | Publication date |
---|---|
CN1902818A (zh) | 2007-01-24 |
US20070075806A1 (en) | 2007-04-05 |
JP2005176318A (ja) | 2005-06-30 |
CN1902818B (zh) | 2010-12-08 |
EP1686689A4 (en) | 2017-11-08 |
JP4593239B2 (ja) | 2010-12-08 |
US7397326B2 (en) | 2008-07-08 |
EP1686689A1 (en) | 2006-08-02 |
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