JP5233594B2 - Surface acoustic wave convolver element - Google Patents

Description

  The present invention relates to a surface acoustic wave convolver element having a calculation function of convolution.

  A pair of interdigital electrodes (also referred to as comb-like electrodes), which are one type of surface acoustic wave excitation detection means, are spaced apart from each other on a flat piezoelectric body disposed on a flat substrate. Such surface acoustic wave elements are well known.

  Here, the surface acoustic wave is an elastic wave that concentrates and propagates much of its energy on the material surface, unlike the longitudinal and transverse waves called normal bulk waves. Rayleigh waves, Sezawa waves, pseudo Sezawa waves, Love A wave etc. can be illustrated and may exist also on the surface of an anisotropic material.

  In such a conventional surface acoustic wave device, a high frequency current is supplied to one interdigital electrode, whereby an elasticity is achieved in a direction in which a plurality of electrode branches of one interdigital electrode are aligned with the piezoelectric body on the substrate. A surface wave is excited. The other comb-shaped electrode is positioned in the propagation direction of the surface acoustic wave excited and propagated by one interdigital electrode in the piezoelectric body on the substrate, and the surface acoustic wave propagated from one interdigital electrode is receive.

  Such conventional surface acoustic wave devices are used for delay lines, oscillation and resonance devices for transmitters, filters for selecting frequencies, chemical sensors, biosensors, remote tags, and the like.

  In the conventional surface acoustic wave device as described above, the surface acoustic wave propagated along the surface of the piezoelectric body from one interdigital electrode toward the other interdigital electrode is piezoelectric in the propagation direction during propagation. It diffuses in the direction perpendicular to the surface of the surface and attenuates energy.

  Therefore, in the conventional surface acoustic wave device as described above, the distance between the pair of interdigital electrodes cannot be set large on a flat piezoelectric body. When it is used to achieve various functions as described above, it is difficult to improve its performance.

  If the surface area of the flat substrate is increased by increasing the energy of the high-frequency current supplied to one of the interdigital electrodes, the distance can be increased, but the power required for driving the surface acoustic wave element is increased. The external dimensions of the surface acoustic wave element are increased.

  A full-surface electrode is arranged between a pair of interdigital electrodes, and a surface acoustic wave is propagated from the pair of interdigital electrodes toward the corresponding interdigital electrodes so that the surface electrode between the pair of interdigital electrodes A surface acoustic wave convolver element that convolves a surface acoustic wave from a pair of interdigital electrodes is known.

  In the surface acoustic wave convolver element, the length of the entire surface electrode between the pair of interdigital electrodes is such that the length that the surface acoustic wave propagates through the entire surface electrode is not longer than the input time length of the surface acoustic wave input signal. Must not. If the distance between the pair of interdigital electrodes is short, the length of the entire surface electrode between the pair of interdigital electrodes also becomes short, so that the input time length of the surface acoustic wave input signal is limited. .

  International Publication No. WO 01/45255 (Patent Document 1) places interdigital electrodes as surface acoustic wave excitation detection means on the surface of a spherical substrate capable of exciting and propagating surface acoustic waves. Surface radius and frequency of surface acoustic wave excited on the surface of the substrate by the interdigital electrode (size of surface acoustic wave in a direction perpendicular to the surface of the substrate along the surface of the surface) Is set to a predetermined condition, and surface acoustic waves excited on the surface of the substrate by the interdigital electrode are diffused infinitely in a direction orthogonal to the direction of propagation along the surface of the substrate. It has been clarified that it can be propagated without being repeated, and thus can be repeatedly circulated.

  The frequency and width of the surface acoustic wave excited on the surface of the substrate by the interdigital electrode (comb-like electrode) are alternated between the pair of comb-like parts constituting the interdigital electrode (comb-like electrode). This corresponds to the gaps between the plurality of electrode branches arranged on each other and the lengths facing each other.

  The trajectory of the surface acoustic wave that circulates around the surface of the spherical substrate is within a region where a part of the sphere including the maximum outer circumference of the spherical substrate is continuous in an annular shape on the surface of the spherical substrate. This area is called a surface acoustic wave circuit. Such a conventional surface acoustic wave device using a spherical base body generates a large number of surface acoustic waves along the surface acoustic wave circuit without diffusing in the direction intersecting the extending direction of the surface acoustic wave circuit. (I.e., after the interdigital electrode excites the surface acoustic wave, the surface of the elastic surface does not accurately detect the surface acoustic wave that circulates the surface acoustic wave circuit). Therefore, it is necessary to accurately measure the degree of deceleration of the surface acoustic wave propagation speed, the degree of phase lag of the surface acoustic wave, and the degree of reduction of the intensity of the surface acoustic wave. I can do it.

A surface acoustic wave that circulates in an annular surface acoustic wave circuit composed of a part of a spherical shape on the outer surface of the substrate has a very small energy attenuation as it propagates. In addition, the length of one round of the annular surface acoustic wave circuit is approximately 3.14 times the diameter of the surface acoustic wave circuit. That is, it is possible to obtain the length of one circumference of the surface acoustic wave circuit that is approximately 3.14 times as long as the outer diameter of the annular surface acoustic wave circuit. The surface acoustic wave that makes one round of the wave hardly attenuates energy as it propagates.
International Publication WO 01/45255

  The present invention has been made under the above circumstances, and an object of the present invention is to set a far longer overall electrode length than a conventional flat surface acoustic wave convolver element, and thus to exhibit higher performance. It is to provide a surface acoustic wave convolver element that can be used.

In order to achieve the above-mentioned object of the present invention, one surface acoustic wave convolver element according to the present invention is: a surface acoustic wave capable of exciting a surface acoustic wave and defined in an annular shape by a part of a spherical surface. A surface acoustic wave substrate including at least one surface acoustic wave circuit capable of circulating waves; and an electroacoustic transducer disposed in the surface acoustic wave circuit , wherein the surface acoustic wave circuit has an elastic surface. A surface acoustic wave excitation means for exciting two surface acoustic waves propagating in opposite directions along the circuit; and disposed in the surface acoustic wave circuit so that the surface acoustic wave circuits are opposite to each other. And a surface electrode that superimposes two surface acoustic waves propagated in the direction to generate a convolution integral output.
In order to achieve the above-mentioned object of the present invention, another surface acoustic wave convolver element according to the present invention is: an elastic surface that can excite surface acoustic waves and is defined in an annular shape by a part of a spherical surface and excited. A surface acoustic wave circuit substrate including at least one surface acoustic wave circuit capable of circulating a surface wave; and an elastic surface excited at each of two locations of the surface acoustic wave circuit by exciting the surface acoustic wave It includes two one-way propagation electroacoustic transducers that propagate waves in only one direction along the surface acoustic wave circuit, and the two one-way electroacoustic transducers are excited to propagate along the surface acoustic wave circuit The surface acoustic wave propagation direction is opposite to each other, and surface acoustic wave excitation means; and in the surface acoustic wave circuit, the two unidirectional propagation electroacoustic transducers are in the radial direction of the surface acoustic wave circuit. Anti Are arranged on the side, the full-surface electrode causes another the two surface acoustic wave propagating in the opposite direction superimposed convolution output surface acoustic wave divider circuit; and a, is characterized in that.
In order to achieve the above-mentioned object of the present invention, yet another surface acoustic wave convolver element according to the present invention is: a surface acoustic wave can be excited and is defined and excited in an annular shape by a part of a spherical surface. A surface acoustic wave circuit substrate including at least one surface acoustic wave circuit capable of circulating a surface acoustic wave; and an elastic body which is arranged at two locations of the surface acoustic wave circuit, each excited by exciting a surface wave A surface acoustic wave excitation means including two electroacoustic transducers for propagating surface waves along the surface acoustic wave circuit in opposite directions; and two electroacoustic transducers in the surface acoustic wave circuit Is arranged on the opposite side of the surface acoustic wave circuit in the radial direction, and the two surface acoustic waves propagating through the surface acoustic wave circuit in opposite directions are superimposed to generate a convolution integral output. To pole; the entire electrode between the two electroacoustic transducer in the surface acoustic wave divider circuit and the surface acoustic wave absorbing means is disposed on the opposite side; and a, is characterized in that.

In one surface acoustic wave convolver element according to the present invention configured as described above, a surface acoustic wave can be excited and is defined as an annular shape by a part of a spherical surface. In a surface acoustic wave circuit substrate including at least one surface acoustic wave circuit capable of circulating a wave, the surface acoustic wave circuit is connected to each other along the surface acoustic wave circuit by one electroacoustic transducer element of the surface acoustic wave excitation means. Two surface acoustic waves propagating in the opposite directions are excited on the surface electrode, and the two surface acoustic waves propagated in the opposite directions in the surface acoustic wave circuit are superimposed on the entire surface electrode arranged in the surface acoustic wave circuit. Produce a convolution integral output.
In another surface acoustic wave convolver element according to the present invention configured as described above, the surface acoustic wave can be excited and is elastically defined and excited by a part of a spherical surface. In a surface acoustic wave circuit substrate including at least one surface acoustic wave circuit capable of circulating a surface wave, the surface acoustic wave circuit is formed by two one-way propagation electroacoustic transducers of surface acoustic wave excitation means. Two surface acoustic waves propagating in opposite directions along each other are excited, and the two surface acoustic waves propagated in opposite directions in the surface acoustic wave circuit are the entire surface arranged in the surface acoustic wave circuit. Superposed at the electrodes to produce a convolution integral output.
In yet another surface acoustic wave convolver device according to the present invention, which is configured as described above, the surface acoustic wave can be excited and is defined and excited in an annular shape by a part of the spherical surface. In a surface acoustic wave circuit including at least one surface acoustic wave circuit capable of circulating a surface acoustic wave, the surface acoustic wave circuit is moved along the surface acoustic wave circuit by two electroacoustic transducers of the surface acoustic wave excitation means. Two surface acoustic waves propagating in the opposite directions to each other are excited, and the two surface acoustic waves propagated in the opposite directions to the surface acoustic wave circuit are generated on the entire surface electrode arranged in the surface acoustic wave circuit. Superposed to produce a convolution integral output. Further, two surface acoustic waves directed to the surface acoustic wave absorbing means opposite to the whole surface electrode in the opposite directions along the surface acoustic wave circuit by the two electroacoustic transducers are absorbed by the surface acoustic wave absorbing means. Is done.

  As described above, the surface acoustic wave that circulates in an annular surface acoustic wave circuit constituted by a part of a spherical shape on the outer surface of the substrate has a very small attenuation of energy as it propagates. In addition, the length of one round of the annular surface acoustic wave circuit is approximately 3.14 times the diameter of the surface acoustic wave circuit.

  Therefore, the surface acoustic wave convolver element according to the present invention, which is configured as described above, can set a much longer overall electrode length than the conventional flat surface acoustic wave convolver element. And by extension, it can demonstrate higher performance.

  Hereinafter, surface acoustic wave convolver elements according to various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 schematically shows a configuration of a surface acoustic wave convolver element 10 according to a first embodiment of the present invention.

  The surface acoustic wave convolver element 10 includes: an elastic surface capable of exciting a surface acoustic wave and including at least one surface acoustic wave circuit 12a in which the excited surface acoustic wave can be circulated and defined in an annular shape by a part of a spherical surface. And a surface acoustic wave exciting means 14 for exciting two surface acoustic waves ASW propagating in opposite directions along the surface acoustic wave circuit 12a to the surface acoustic wave circuit 12a; And a full-surface electrode 16 which is arranged in the surface wave circuit 12a and superimposes two surface acoustic waves ASW propagating through the surface acoustic wave circuit 12a in directions opposite to each other to generate a convolution integral output.

  The surface acoustic wave revolving substrate 12 capable of exciting a surface acoustic wave can be formed by coating the surface of a spherical base material that cannot excite a surface acoustic wave with a material capable of exciting a surface acoustic wave, or a piezoelectric element. It can also be composed of a crystalline material.

Examples of piezoelectric crystal materials that can excite surface acoustic waves include quartz, langasite, lithium niobate (lithium niobate: LiNbO ₃ ), and lithium tantalate (lithium tantalate: LiTaO ₃ ). . These crystal materials are excited when the surface acoustic wave ASW is excited along the intersection line 12b where the crystal planes of the respective spherical outer surfaces intersect the spherical outer surface. It has been found that ASW propagates along the intersection line 12b. According to International Publication No. WO 01/45255 (Patent Document 1), the radius of the spherical surface acoustic wave substrate 12 capable of exciting and propagating the surface acoustic wave ASW and the surface acoustic wave substrate 12 Frequency and width of surface acoustic wave ASW excited on the outer surface (surface acoustic wave in a direction orthogonal to the direction in which surface acoustic wave ASW propagates on the surface of surface acoustic wave substrate 12 along the surface of surface acoustic wave substrate 12) The surface acoustic wave ASW excited on the surface of the surface acoustic wave substrate 12 is propagated along the surface of the surface acoustic wave substrate 12 with respect to the direction of propagation along the surface of the surface acoustic wave substrate 12. It is clarified that it can be propagated without infinitely diffusing in the direction orthogonal to the surface of the circulating substrate 12, and can be repeatedly rotated. There.

  The intersecting line 12b is a line that becomes the outer periphery of the maximum diameter on the outer surface of the surface acoustic wave circulating substrate 12, and is a circle formed by a part of the spherical surface on which the surface acoustic wave ASW excited along the intersecting line 12b propagates. The region defined in an annular shape is the surface acoustic wave circuit 12a.

  Each of quartz and langasite is known to have three crystal planes. Accordingly, when each of quartz and langasite is used as a piezoelectric crystal material for the surface acoustic wave revolving substrate 14, three surface acoustic wave circuits 12a can be set on the spherical outer surface. become.

  Each of lithium niobate and lithium tantalate is known to have 10 crystal planes. Accordingly, when each of lithium niobate and lithium tantalate is used as the piezoelectric crystalline material for the surface acoustic wave revolving base 12, ten surface acoustic wave circuits 12a can be set on the spherical outer surface. It will be.

  As the surface acoustic wave excitation means 14, the surface acoustic wave ASW excited by the surface acoustic wave circuit 12 a of the surface acoustic wave substrate 12 is infinite in the direction orthogonal to the propagation direction along the surface of the surface acoustic wave substrate 12. In order to make it possible to easily set the wavelength and the width satisfying the above-mentioned predetermined conditions, it is said to be an interdigital electrode (or comb-like electrode). Known electroacoustic transducers are usually used.

  The interdigital electrode (comb-like electrode) includes a pair of comb-like electrode portions 14b and 14c each having a plurality of comb-like electrode branches 14a and a plurality of comb-teeth of one comb-like electrode portion 14b. Each of the plurality of comb-like electrode branches 14a of the other comb-like electrode portion 14c is arranged at the center of each of the plurality of gaps of the electrode-like electrode branch 14a. The interdigital electrode (comb-like electrode) having such a configuration can be easily and precisely formed by a known forming method (for example, photolithography method) at a desired position of the surface acoustic wave circuit 12a of the surface acoustic wave substrate 12a. It is possible to form. A pair of interdigital electrodes or comb-like electrodes are formed on the surface acoustic wave circuit 12a of the surface acoustic wave-circulating substrate 12 with a plurality of comb-like electrode branches 14a facing the intersecting line 12b. When a high-frequency current having a frequency corresponding to the distance between the two comb-like electrode branches 14a facing each other is supplied to the comb-like electrode portions 14b and 14c, the interdigital electrode or the comb-like electrode Has a frequency corresponding to the distance between the two comb-like electrode branches 14a facing each other, and each of the two comb-like electrode branches 14a facing each other. A surface acoustic wave ASW having a width corresponding to the length of the facing portion is excited to the desired position of the surface acoustic wave circuit 12a of the surface acoustic wave circulating substrate 12, and the excited surface acoustic wave ASW is 1 A plurality of comb-like electrode branches of a pair of comb-like electrode portions Row traveling in direction (i.e., be propagated) causes.

  A normal interdigital electrode (comb-like electrode) propagates two surface acoustic waves ASW in opposite directions.

  Here, the surface acoustic wave ASW is an elastic wave that concentrates and propagates much of its energy on the material surface, unlike the longitudinal and transverse waves called normal bulk waves, and is a Rayleigh wave, Sezawa wave, or pseudo Sezawa wave. A wave, a love wave, etc. can be illustrated.

  One of a pair of interdigital electrodes 14b and 14c of the interdigital electrode or comb-like electrode constituting the surface acoustic wave excitation means 14 is connected to the surface acoustic wave circuit 12a of the surface acoustic wave rotating substrate 12. On the other hand, a high-frequency signal generator 18 is connected to the surface acoustic wave excitation means 14 for exciting and propagating the surface acoustic wave ASW in bursts at a desired timing. The other of the pair of comb-like electrode portions 14b and 14c of the interdigital electrode or the comb-like electrode constituting the surface acoustic wave excitation means 14 is grounded.

  The entire surface electrode 16 is connected to the detection / output unit 22 via the amplifier 20.

  When the high-frequency signal generator 18 supplies a burst-like high-frequency signal to the surface acoustic wave exciting means 14 at a desired timing, the surface acoustic wave exciting means 14 excites the surface acoustic wave ASW on the burst in the surface acoustic wave circuit 12a. Then, the excited burst-like surface acoustic wave ASW propagates in the surface acoustic wave circuit 12a from the surface acoustic wave excitation means 14 in the opposite directions along the intersection line 12b. The burst-like surface acoustic waves ASW propagated in the surface acoustic wave circuit 12a along the intersection line 12b in opposite directions to each other are superimposed on the entire surface electrode 16 to have an infinite wavelength due to the nonlinear effect of the surface acoustic wave ASW ( That is, a convolution integration calculation output is generated that has a uniform amplitude in the propagation direction and a double frequency. In this convolution integral, the time axis is shortened to ½ compared to the mathematically defined convolution integral. This output is sent from the surface acoustic wave excitation means 14 to the detection / output section 22 via the amplifier 20, and is sent from the detection / output section 22 to, for example, a known display means or storage means.

  The convolution integral between two surface acoustic waves ASW propagated in opposite directions becomes an autocorrelation function. The surface acoustic wave ASW is excited twice at different timings, and the outputs of the entire surface electrodes 16 are detected at the timing when the surface acoustic waves ASW excited at different timings overlap with each other at the entire surface electrode 16, thereby allowing the elasticity excited at different timings. The convolution integral between the surface wave ASWs can also be obtained.

[Second Embodiment]
Next, a surface acoustic wave convolver element 30 according to a second embodiment of the present invention will be described with reference to FIG. 2 in the accompanying drawings.

  Note that most of the configuration of the surface acoustic wave convolver element 30 according to this embodiment is the same as most of the configuration of the surface acoustic wave convolver element 10 according to the first embodiment described above with reference to FIG. . Accordingly, in the surface acoustic wave convolver element 30 according to this embodiment, the same constituent members as those of the surface acoustic wave convolver element 10 according to the first embodiment are used as the surface acoustic wave convolver element 10 according to the first embodiment. The detailed description is abbreviate | omitted by describing the referential mark attached | subjected to the corresponding structural member.

  The structure of the surface acoustic wave convolver element 30 according to this embodiment is different from the structure of the surface acoustic wave convolver element 10 according to the first embodiment described above with reference to FIG. 14 is a one-way propagation electroacoustic transducer 30a, 30b that propagates the excited surface acoustic wave ASW disposed in at least two locations of the surface acoustic wave circuit 12a in only one direction along the surface acoustic wave circuit 12a. It is to include. Each of the one-way propagation electroacoustic transducers 30a and 30b is a known one-way propagation ladder electrode (one-way electrode configured to propagate the excited surface acoustic wave ASW in only one direction along the surface acoustic wave circuit 12a. Direction propagating comb-like electrode).

  Each of the at least two one-way propagation electroacoustic transducers 30a and 30b in the at least two locations is supplied with a high frequency of the same frequency in burst form from the high frequency signal generator 18 and thereby the surface acoustic wave circuit 12a. The surface acoustic wave ASW propagating in only one direction opposite to each other along the direction is excited.

  The two one-way propagation electroacoustic transducers 30a and 30b propagate a distance as long as possible until the surface acoustic wave ASW propagated only in one direction along the surface acoustic wave circuit 12a can reach the entire surface electrode 16. In the surface acoustic wave circuit 12a, the entire surface electrode 16 is disposed on the opposite side in the radial direction of the surface acoustic wave circuit 12a. Surface acoustic waves ASW propagated only in one direction along the surface acoustic wave circuit 12a from the two one-way propagation electroacoustic transducers 30a and 30b are directed toward the entire surface electrode 16 along the surface acoustic wave circuit 12a. A convolution integral output that propagates in the approaching direction and is superposed on the entire surface electrode 16 and has an infinite length due to the nonlinear effect of the surface acoustic wave ASW (that is, a double frequency with a uniform amplitude in the propagation direction) Cause it to occur.

[Third Embodiment]
Next, a surface acoustic wave convolver element 40 according to a third embodiment of the present invention will be described with reference to FIG. 3 in the accompanying drawings.

  Note that most of the configuration of the surface acoustic wave convolver element 40 according to this embodiment is the same as most of the configuration of the surface acoustic wave convolver element 10 according to the first embodiment described above with reference to FIG. . Accordingly, in the surface acoustic wave convolver element 40 according to this embodiment, the same constituent members as those of the surface acoustic wave convolver element 10 according to the first embodiment are used as the surface acoustic wave convolver element 10 according to the first embodiment. The detailed description is abbreviate | omitted by describing the referential mark attached | subjected to the corresponding structural member.

  The structure of the surface acoustic wave convolver element 40 according to this embodiment differs from the structure of the surface acoustic wave convolver element 10 according to the first embodiment described above with reference to FIG. 14 includes electroacoustic transducers 40a and 40b disposed in at least two places of the surface acoustic wave circuit 12a, and the surface acoustic wave absorbing means 42 is disposed on the opposite side of the entire surface electrode 16 between the two places. Is arranged. The surface acoustic wave absorbing means 42 can be composed of, for example, an elastomer or a viscoelastic body.

  Each of the electroacoustic transducers 40a and 40b is configured by a known ladder-like electrode (comb-like electrode).

  Each of the two electroacoustic transducers 40a, 40b propagates in two opposite directions along the surface acoustic wave circuit 12a by being simultaneously supplied with a high frequency of the same frequency in burst form from the high frequency signal generator 18. The surface acoustic wave ASW is excited.

  In the two electroacoustic transducers 40a and 40b, the surface acoustic wave ASW propagated only in one direction opposite to the surface acoustic wave absorber 42 along the surface acoustic wave circuit 12a can reach the entire surface electrode 16. In the surface acoustic wave circuit 12a, the entire surface electrode 16 is disposed on the opposite side in the radial direction of the surface acoustic wave circuit 12a so that it can propagate as long as possible.

  The surface acoustic wave ASW propagating in the other direction along the surface acoustic wave circuit 12a from the two electroacoustic transducers 40a and 40b toward the surface acoustic wave absorbing means 42 is absorbed by the surface acoustic wave absorbing means 42, and one electric The surface acoustic wave ASW traveling in the other direction does not reach from the acoustic transducer 40a to the other electroacoustic transducer 40b and vice versa.

  The surface acoustic wave ASW propagated in one direction opposite to the surface acoustic wave absorbing means 42 along the surface acoustic wave circuit 12a from each of the two electroacoustic transducers 40a and 40b is along the surface acoustic wave circuit 12a. It propagates toward the full surface electrode 16 so as to approach each other, and is superposed on the full surface electrode 16 so that the wavelength becomes infinite due to the nonlinear effect of the surface acoustic wave ASW (that is, the frequency is doubled with a uniform amplitude in the propagation direction). ) Generate the convolution integral operation output.

1 is a schematic diagram schematically showing a configuration of a surface acoustic wave convolver device according to a first embodiment of the present invention. It is the schematic which shows schematically the structure of the surface acoustic wave convolver element according to 2nd Embodiment of this invention. It is the schematic which shows schematically the structure of the surface acoustic wave convolver element according to 3rd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Surface acoustic wave convolver element, 12 ... Surface acoustic wave circulation base | substrate, 12a ... Surface acoustic wave circuit, 12b ... Intersection, ASW ... Surface acoustic wave, 14 ... Surface acoustic wave excitation means, 14a ... Comb-like electrode branch , 14b, 14c ... comb-like electrode part, 16 ... full surface electrode, 18 ... high frequency signal generating part, 20 ... amplifier, 22 ... detection / output part, 30 ... surface acoustic wave convolver element, 30a, 30b ... one-way propagation electricity Acoustic transducer 40, surface acoustic wave convolver, 40a, 40b electroacoustic transducer.

Claims (3)

A surface acoustic wave circuit substrate that includes at least one surface acoustic wave circuit that is capable of exciting surface acoustic waves and is circularly defined by a part of a spherical surface and capable of circulating the excited surface wave;
It includes one electroacoustic transducer arranged in the surface acoustic wave circuit, and excites two surface acoustic waves propagating in opposite directions along the surface acoustic wave circuit in the surface acoustic wave circuit Surface acoustic wave excitation means; and
A full-surface electrode disposed in the surface acoustic wave circuit and generating a convolution integral output by superimposing two surface acoustic waves propagated through the surface acoustic wave circuit in opposite directions;
With
A surface acoustic wave convolver element. A surface acoustic wave circuit substrate that includes at least one surface acoustic wave circuit that is capable of exciting surface acoustic waves and is circularly defined by a part of a spherical surface and capable of circulating the excited surface wave;
Two one-way propagation electroacoustic transformations, which are arranged at two locations of the surface acoustic wave circuit, respectively, which excite surface acoustic waves and propagate the excited surface acoustic waves in only one direction along the surface acoustic wave circuit A surface acoustic wave excitation means including two elements, wherein two unidirectional propagation electroacoustic transducers are excited and propagated along the surface acoustic wave circuit, the propagation directions of the surface acoustic waves being opposite to each other; ,
In the surface acoustic wave circuit, the two one-way propagation electroacoustic transducers are arranged on the opposite side in the radial direction of the surface acoustic wave circuit, and the two surface acoustic wave circuits are propagated in opposite directions. A full-surface electrode on which surface acoustic waves are superimposed to produce a convolution integral output;
With
Surface acoustic wave convolver device you wherein a. A surface acoustic wave circuit substrate that includes at least one surface acoustic wave circuit that is capable of exciting surface acoustic waves and is circularly defined by a part of a spherical surface and capable of circulating the excited surface wave;
Two electroacoustic transducers arranged at two locations of the surface acoustic wave circuit, each of which excites surface acoustic waves and propagates the excited surface acoustic waves in opposite directions along the surface acoustic wave circuit A surface acoustic wave excitation means comprising: and
In the surface acoustic wave circuit, the two electroacoustic transducers are arranged on the opposite side in the radial direction of the surface acoustic wave circuit, and the two surface acoustic waves propagated through the surface acoustic wave circuit in opposite directions. A full surface electrode to produce a convolution integral output with superimposed;
A surface acoustic wave absorber disposed on the opposite side of the entire surface electrode between the two electroacoustic transducers in the surface acoustic wave circuit;
With
Surface acoustic wave convolver device you wherein a.

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