CN116405005A - Finger parameter determining method, device, equipment and filter of interdigital transducer - Google Patents
Finger parameter determining method, device, equipment and filter of interdigital transducer Download PDFInfo
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- H—ELECTRICITY
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Abstract
The invention relates to the technical field of filters, and provides a finger parameter determining method, device and equipment of an interdigital transducer and a filter, wherein the method comprises the following steps: acquiring a target time domain signal of the surface acoustic wave filter, and performing apodization weighting on an interdigital transducer of the surface acoustic wave filter according to the target time domain signal to obtain an apodization interdigital transducer; determining the weighted numerical value of each finger in the apodization interdigital transducer by taking the aperture size of the apodization interdigital transducer as a reference; carrying out phase weighting on the finger strips of the apodization interdigital transducer in the aperture direction according to the weighted value so as to determine finger strip parameters of each finger strip of the apodization interdigital transducer; the finger parameters include finger length and finger position. The length and the position of the finger strip are determined through apodization weighting and phase weighting, so that the finger strips are continuously arranged in the aperture direction and have equal length with the aperture, the weighting effect of the apodization transducer is realized, the surface acoustic wave filter obtains high out-of-band suppression, and the bandwidth application range of the filter is increased.
Description
Technical Field
The present invention relates to the field of filters, and in particular, to a method, an apparatus, a device, and a filter for determining finger parameters of an interdigital transducer.
Background
The surface acoustic wave transverse filter generally consists of two or more interdigital transducers (IDTs), and in order to prevent waveform distortion, the two interdigital transducers must have a non-apodization transducer with equal finger length, so that the design of a collinear structure can be adopted, and the volume of the surface acoustic wave filter is reduced. The non-apodization transducer is generally composed of finger arrays with equal finger lengths, such as an equal finger transducer, an extraction finger transducer and the like, but the stop band inhibition of the equal finger transducer is poorer than that of the apodization transducer, and the non-apodization transducer is applicable to a surface acoustic wave filter with smaller relative bandwidth and has a limited bandwidth application range.
Disclosure of Invention
The invention provides a finger parameter determining method, device and equipment of an interdigital transducer and a filter, which are used for solving the defects that the stop band inhibition of the traditional interdigital transducer is relatively poor and the bandwidth application range is smaller.
The invention provides a finger parameter determining method of an interdigital transducer, which comprises the following steps:
acquiring a target time domain signal of a surface acoustic wave filter, and performing apodization weighting on an interdigital transducer of the surface acoustic wave filter according to the target time domain signal to obtain an apodization interdigital transducer;
Determining a weighted numerical value of each finger in the apodization interdigital transducer by taking the aperture size of the apodization interdigital transducer as a reference;
carrying out phase weighting on the finger strips of the apodization interdigital transducer in the aperture direction of the apodization interdigital transducer according to the weighted numerical value so as to determine finger strip parameters of each finger strip of the apodization interdigital transducer; the finger parameters include finger length and finger position.
According to the finger parameter determining method of the interdigital transducer, the finger parameter also comprises the number of finger sections, the length of each finger section comprises the length of each finger section, and the finger section position comprises the distribution position of each finger section in the aperture of the apodized interdigital transducer;
the finger strip of the apodization interdigital transducer comprises a signal finger and a grounding finger, and the apodization interdigital transducer further comprises an upper bus bar and a lower bus bar; the signal finger is connected with the upper bus bar in the aperture direction of the apodization interdigital transducer, and the grounding finger is connected with the lower bus bar in the aperture direction of the apodization interdigital transducer.
According to the finger parameter determining method of the interdigital transducer provided by the invention, the finger of the apodization interdigital transducer is subjected to phase weighting in the aperture direction of the apodization interdigital transducer according to the weighting value so as to determine the finger parameter of each finger of the apodization interdigital transducer, and the finger parameter determining method comprises the following steps:
Acquiring a normalized weighted value corresponding to the aperture size of the apodization interdigital transducer;
taking a target signal finger in each signal finger of the apodization interdigital transducer as a reference finger, and acquiring k signal fingers continuously adjacent to the reference finger in a target direction; the target direction is perpendicular to the aperture direction of the apodization interdigital transducer, and the target signal refers to a signal finger adjacent to the middle finger of the apodization interdigital transducer in the target direction;
dividing the kth signal finger of the k signal fingers into an upper segment signal finger and a lower segment signal finger according to the weighted value of the k signal fingers and the weighted value of the first k-1 signal fingers of the k signal fingers if the sum of the weighted value of the k signal fingers and the weighted value of the reference finger is larger than the normalized weighted value, so that the sum of the weighted values of the reference finger, the first k-1 signal fingers of the k signal fingers and the lower segment signal finger is equal to the normalized weighted value;
the reference finger strip, the first k-1 signal fingers in the k signal fingers and the lower segment signal fingers are arranged in a non-overlapping and continuous mode in the aperture direction of the apodization interdigital transducer so as to determine the distribution positions of the reference finger strip, the first k-1 signal fingers in the k signal fingers and the lower segment signal fingers in the aperture direction of the apodization interdigital transducer;
Returning and executing the step of acquiring k signal fingers continuously adjacent to the reference finger in the target direction by taking the lower segment signal finger as the reference finger until the kth signal finger in the k signal fingers is the last signal finger of the apodization interdigital transducer in the target direction, so as to acquire finger parameters of each signal finger of the apodization interdigital transducer;
and determining finger parameters of each grounding finger of the apodized interdigital transducer based on the finger parameters of each signal finger.
According to the finger parameter determining method of the interdigital transducer provided by the invention, finger parameters of each grounding finger of the apodized interdigital transducer are determined based on the finger parameters of each signal finger, and the finger parameter determining method comprises the following steps:
determining a piezoelectric gap of each signal finger based on finger parameters of the signal finger;
and determining finger parameters of each grounding finger of the apodization interdigital transducer according to the piezoelectric gaps.
According to the finger parameter determining method of the interdigital transducer provided by the invention, the interdigital transducer of the surface acoustic wave filter is apodized and weighted according to the target time domain signal to obtain an apodized interdigital transducer, and the method comprises the following steps:
Sampling the target time domain signal to obtain sampling points corresponding to different time points of the target time domain signal;
and carrying out apodization weighting treatment on the interdigital transducer according to the position and the amplitude of the sampling point to obtain the apodization interdigital transducer.
According to the finger parameter determining method of the interdigital transducer provided by the invention, the target time domain signal of the surface acoustic wave filter is obtained, and the method comprises the following steps:
acquiring a target frequency response of the surface acoustic wave filter;
performing Fourier transform on the target frequency response to obtain a time domain response signal corresponding to the surface acoustic wave filter;
performing truncation processing on the time domain response signal based on a preset window function to obtain a target time domain signal; and the window width corresponding to the window function is the same as the period length of the interdigital transducer of the surface acoustic wave filter.
According to the finger parameter determining method of the interdigital transducer provided by the invention, after the finger of the apodization interdigital transducer is subjected to phase weighting in the aperture direction of the apodization interdigital transducer according to the weighting value so as to determine the finger parameter of each finger of the apodization interdigital transducer, the method further comprises the following steps:
Determining a first frequency response of the SAW filter based on the finger parameters;
comparing the first frequency response with the target frequency response to determine whether the finger parameter meets a preset condition;
and if not, returning to and executing the step of carrying out apodization weighting on the interdigital transducer of the surface acoustic wave filter according to the target time domain signal to obtain an apodized interdigital transducer until the finger parameters meet the preset conditions.
The invention also provides a finger parameter determining device of the interdigital transducer, which comprises:
the apodization weighting module is used for obtaining a target time domain signal of the surface acoustic wave filter, and apodization weighting is carried out on the interdigital transducer of the surface acoustic wave filter according to the target time domain signal to obtain an apodization interdigital transducer;
the weighted numerical value determining module is used for determining the weighted numerical value of each finger in the apodization interdigital transducer by taking the aperture size of the apodization interdigital transducer as a reference;
the phase weighting module is used for carrying out phase weighting on the finger strips of the apodization interdigital transducer in the aperture direction of the apodization interdigital transducer according to the weighted numerical value so as to determine finger strip parameters of each finger strip of the apodization interdigital transducer; the finger parameters include finger length and finger position.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the finger parameter determining method of any one of the interdigital transducers when executing the program.
The invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a finger parameter determination method of an interdigital transducer as described in any of the above.
The invention also provides a computer program product comprising a computer program which when executed by a processor implements a finger parameter determination method of an interdigital transducer as described in any of the above.
The invention also provides a surface acoustic wave filter, which comprises an interdigital transducer, wherein the interdigital transducer is generated by adopting the finger parameter design determined by the finger parameter determination method of the interdigital transducer.
According to the finger parameter determining method, device and equipment of the interdigital transducer and the filter, the target time domain signal of the surface acoustic wave filter is obtained, and the interdigital transducer of the surface acoustic wave filter is subjected to apodization weighting according to the target time domain signal, so that the apodization interdigital transducer is obtained; determining the weighted numerical value of each finger in the apodization interdigital transducer by taking the aperture size of the apodization interdigital transducer as a reference; carrying out phase weighting on the finger strips of the apodization interdigital transducer in the aperture direction of the apodization interdigital transducer according to the weighted value so as to determine finger strip parameters of each finger strip of the apodization interdigital transducer; the finger parameters include finger length and finger position. The length and the position of the finger are determined through apodization weighting and phase weighting, so that the finger is continuously arranged in the aperture direction and equal to the aperture, the weighting effect of the apodization transducer is realized, the surface acoustic wave filter obtains high out-of-band suppression, and the bandwidth application range of the surface acoustic wave filter is increased.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a finger parameter determination method for an interdigital transducer provided by the invention;
FIG. 2 is a schematic diagram of the structure of an apodization interdigital transducer provided by the present invention;
FIG. 3 is a schematic diagram of a structure of an apodized interdigital transducer with weighted signal finger phases according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a piezoelectric gap of a signal finger of an apodized interdigital transducer provided by an embodiment of the present invention;
FIG. 5 is a schematic diagram of a ground finger of an apodized interdigital transducer provided by an embodiment of the present invention;
FIG. 6 is a schematic diagram of the phase weighted signal finger and ground finger of an apodized interdigital transducer according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a finger parameter determination apparatus for an interdigital transducer provided by the present invention;
Fig. 8 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Finger parameter determination methods, apparatus, devices and filters for an interdigital transducer of the present invention are described below in conjunction with fig. 1-8.
According to the finger parameter determining method of the interdigital transducer, the length of each finger of the interdigital transducer is kept consistent with the aperture through phase weighting, the equal-finger-length phase weighting finger array is adopted to approach the weighting effect of the apodization transducer, the apodization weighting effect is achieved, so that the surface acoustic wave filter obtains high out-of-band suppression, and the bandwidth application range of the surface acoustic wave filter is increased. Specifically, referring to fig. 1, fig. 1 is a flow chart of a finger parameter determining method of an interdigital transducer according to an embodiment of the present invention, and based on fig. 1, the finger parameter determining method of an interdigital transducer according to an embodiment of the present invention includes:
and acquiring a target time domain signal of the surface acoustic wave filter, wherein the target time domain signal is determined based on the expected frequency response characteristic of the surface acoustic wave filter, and apodization weighting is carried out on the interdigital transducer of the surface acoustic wave filter based on the target time domain signal to obtain the apodization interdigital transducer. Specifically, the period length of the interdigital transducer is equal to the period length of the target time domain signal, the finger strip length of the interdigital array is the amplitude of the time domain signal, the amplitude of the time domain signal at different positions is different, the finger strip length at the corresponding position of the interdigital transducer is also different, and the interdigital transducer is apodized.
200, determining a weighted numerical value of each finger in the apodization interdigital transducer by taking the aperture size of the apodization interdigital transducer as a reference;
the aperture size of the apodization interdigital transducer, namely the aperture size of the interdigital transducer, is determined by taking the aperture size of the apodization interdigital transducer as a reference, and generally, in the apodization interdigital transducer, the middle finger is longest, and the length of the middle finger is the same as or close to the aperture size. The method comprises the steps of taking the aperture size of an apodization interdigital transducer as a reference, determining the weighted numerical value of each finger in the apodization interdigital transducer, specifically taking the aperture size as the reference, setting a corresponding reference value, for example, 1, and determining the weighted numerical value of each finger according to the ratio of the length of each finger to the aperture size; or setting a corresponding reference value by taking the length of the middle finger as a reference, and determining the weighted values of other fingers according to the ratio of the lengths of the other fingers to the length of the middle finger.
And carrying out phase weighting on each finger according to the weighted numerical value of each finger of the apodization interdigital transducer so as to determine finger parameters of each finger, wherein the finger parameters comprise finger length and finger position, and the finger position refers to the distribution position of the finger in the aperture of the apodization interdigital transducer. The phase of each finger is weighted by the phase of the finger, specifically, the aperture size is taken as a reference, according to the weighted numerical value of each finger, one or more adjacent fingers are continuously arranged in the aperture direction of the apodization interdigital transducer, the length of the continuously arranged fingers is equal to the aperture when the continuously arranged fingers are connected together, the equal-finger-length phase weighted finger array is realized, the weighting effect of the apodization transducer is approximated, and the apodization weighting effect is realized.
In the embodiment, an apodization weighting is carried out on an interdigital transducer of a surface acoustic wave filter according to a target time domain signal of the surface acoustic wave filter by acquiring the target time domain signal of the surface acoustic wave filter, so as to obtain the apodization interdigital transducer; determining the weighted numerical value of each finger in the apodization interdigital transducer by taking the aperture size of the apodization interdigital transducer as a reference; carrying out phase weighting on the finger strips of the apodization interdigital transducer in the aperture direction according to the weighted value so as to determine finger strip parameters of each finger strip of the apodization interdigital transducer; the finger parameters include finger length and finger position. The length and the position of the finger are determined through apodization weighting and phase weighting, so that the finger can be continuously arranged in the aperture direction of the apodization interdigital transducer and have equal length with the aperture, the weighting effect of the apodization transducer is realized, the surface acoustic wave filter obtains high out-of-band suppression, and the bandwidth application range of the surface acoustic wave filter is increased.
In a preferred embodiment, in step 100, obtaining a target time domain signal of a surface acoustic wave filter includes:
step 101, obtaining a target frequency response of a surface acoustic wave filter;
102, performing Fourier transform on the target frequency response to obtain a time domain response signal corresponding to the surface acoustic wave filter;
step 103, cutting off the time domain response signal based on a preset window function to obtain a target time domain signal; and the window width corresponding to the window function is the same as the period length of the interdigital transducer of the surface acoustic wave filter.
When acquiring a target time domain signal of a surface acoustic wave filter, first, acquiring a target frequency response of the surface acoustic wave filter, wherein the target frequency response is a desired frequency response of the surface acoustic wave filter, that is, a design target of a frequency response characteristic of the surface acoustic wave filter. The target frequency response of the surface acoustic wave filter is subjected to fourier transformation to obtain a corresponding time domain response signal, and it is understood that the time domain response signal may be infinitely long, and the length of the interdigital transducer is limited, and the finite interdigital transducer cannot correspond to the infinitely long time domain signal, so that the infinitely long time domain signal needs to be truncated. Specifically, based on a preset window function, the time domain signal is truncated to obtain a target time domain signal, wherein the target time domain signal is a time domain signal truncated in a window. The window width corresponding to the window function when the time response signal is truncated is the same as the period length of the interdigital transducer, and the signal length of the target time domain signal obtained by the truncation processing based on the window function is the same as the period length of the interdigital transducer.
Preferably, in step 200, apodization weighting is performed on the interdigital transducer of the surface acoustic wave filter according to the target time domain signal, so as to obtain an apodized interdigital transducer, including:
step 201, sampling the target time domain signal to obtain sampling points corresponding to different time points of the target time domain signal;
and 202, performing apodization weighting processing on the interdigital transducer according to the position and the amplitude of the sampling point to obtain the apodization interdigital transducer.
When the apodization weighting is carried out on the interdigital transducer, firstly, sampling processing is carried out on the target time domain signal to obtain sampling points corresponding to different time points of the target time domain signal, and the apodization weighting processing is carried out on the interdigital transducer according to the position and the amplitude of each sampling point to obtain the apodization interdigital transducer. The positions of the fingers in the interdigital transducer correspond to sampling points of time domain signals with finite lengths at different time points, the period length of the interdigital transducer is equal to that of the time domain signals, and the lengths of the fingers of the interdigital transducer are the amplitudes of the time domain signals at the sampling points.
According to finger positions of the interdigital transducer, sampling processing is carried out on the target time domain signal, a corresponding relation between finger of the interdigital transducer and a target time domain signal sampling point is established, the lengths of the corresponding finger are determined according to the amplitude of each sampling point, the amplitudes of different sampling points are different, the lengths of the finger at the corresponding positions are also different, so that apodization weighting of the interdigital transducer is achieved, and the apodization interdigital transducer shown in figure 2 is obtained.
Preferably, the finger parameters further comprise finger segment numbers, the finger length comprises the length of each segment of finger, and the finger position comprises the distribution position of each segment of finger in the aperture of the apodization interdigital transducer; the finger strip of the apodization interdigital transducer comprises a signal finger and a grounding finger, the apodization interdigital transducer further comprises an upper bus bar S and a lower bus bar G, the signal finger is connected with the upper bus bar in the aperture direction of the apodization interdigital transducer, and the grounding finger is connected with the lower bus bar in the aperture direction of the apodization interdigital transducer. Specifically, referring to the schematic structural diagram of the apodization interdigital transducer shown in fig. 2, the finger strips of the apodization transducer can be divided into two types according to polarities, and the finger strips connected with the upper bus bar S are used for connecting signals and are used for connecting signal fingers, and the finger strips connected with the lower bus bar G are used for grounding and are used for grounding fingers. Based on the above, the finger segment number comprises the segment number of each signal finger and the segment number of each grounding finger, the finger length comprises the length of each segment finger of the signal finger and the length of each segment finger of the grounding finger, and the finger position comprises the distribution position of each segment finger of the signal finger in the aperture of the apodization interdigital transducer and the distribution position of each segment finger of the grounding finger in the aperture of the apodization interdigital transducer. Wherein the aperture of the apodized interdigital transducer comprises a plurality.
In a preferred embodiment, the finger of the apodization interdigital transducer is phase weighted in the aperture direction of the apodization interdigital transducer according to the weighted value, when determining the finger parameters of each finger, the signal finger may be phase weighted first, the finger parameters of each signal finger are determined, and when the finger parameters of the signal finger are determined, the finger parameters of the ground finger are also determined. Specifically, according to the weighted numerical value of each signal finger, continuously arranging the plurality of finger strips in the aperture direction according to the aperture position and the weighted numerical value of each signal finger until the sum of the lengths of the plurality of signal fingers is greater than or equal to the aperture size of the signal finger, and then repeatedly continuously arranging the finger strips in the aperture direction according to the aperture position and the weighted numerical value of the signal finger, thereby determining the finger strip section number of each signal finger and the distribution position of each section of finger strip in the aperture, and obtaining the finger strip parameters of each signal finger. In the apodization interdigital transducer, with the middle finger as a reference, i=0, i is the finger serial number of the apodization interdigital transducer, in this embodiment, for convenience of description, as shown in fig. 2, the finger serial number on the left of the middle finger is denoted as i <0, the finger serial number on the right is denoted as i >0, and the fingers on the left and right sides of the apodization interdigital transducer are symmetrical based on the middle finger, namely, the 0 th finger.
Further, in step 300, the finger of the apodization interdigital transducer is phase weighted in the aperture direction of the apodization interdigital transducer according to the weighted value of each finger to determine the finger parameters of each finger of the apodization interdigital transducer, which specifically includes:
step 301, obtaining a normalized weighted value corresponding to the aperture size of the apodization interdigital transducer;
step 302, taking a target signal finger in signal fingers of the apodization interdigital transducer as a reference finger, and acquiring k signal fingers continuously adjacent to the reference finger in a target direction; the target direction is perpendicular to the aperture direction of the apodization interdigital transducer, and the target signal refers to a signal finger adjacent to the middle finger of the apodization interdigital transducer in the target direction;
step 303, according to the weighted values of the signal fingers of the apodized interdigital transducer, if the sum of the weighted values of the k signal fingers and the weighted value of the reference finger strip is greater than the normalized weighted value, dividing the kth signal finger of the k signal fingers into an upper segment signal finger and a lower segment signal finger according to the weighted values of the reference finger strip and the first k-1 signal fingers of the k signal fingers so that the sum of the weighted values of the reference finger strip, the first k-1 signal fingers of the k signal fingers and the lower segment signal finger is equal to the normalized weighted value;
Step 304, the reference finger, the first k-1 signal fingers in the k signal fingers and the lower segment signal fingers are arranged in a non-overlapping manner in the aperture direction of the apodization interdigital transducer, so as to determine the distribution positions of the reference finger, the first k-1 signal fingers in the k signal fingers and the lower segment signal fingers in the aperture direction of the apodization interdigital transducer;
step 305, taking the lower segment signal finger as a reference finger, returning and executing the step of acquiring k signal fingers continuously adjacent to the reference finger in the target direction until the kth signal finger in the k signal fingers is the last signal finger in the apodization interdigital transducer, and obtaining finger parameters of each signal finger of the apodization interdigital transducer;
step 306, determining finger parameters of each ground finger of the apodized interdigital transducer based on finger parameters of each signal finger.
First, a normalized weighted value corresponding to the aperture size of the apodized interdigital transducer is obtained, and for convenience of calculation, the normalized weighted value of the apodized interdigital transducer is set to 1, the weighted value of the ith signal finger is denoted as h (i), and h (0) =1 can be considered as h (0) =1 since the length of the middle finger is substantially equal to the aperture size.
And taking a target signal finger in each finger of the apodization interdigital transducer as a reference finger, wherein the target signal finger is a signal finger adjacent to the middle finger in a target direction, and the target direction is perpendicular to the aperture direction of the apodization interdigital transducer and comprises a left direction and a right direction of the middle finger. Taking the signal finger adjacent to the left of the middle finger as a reference finger strip, and acquiring k signal fingers continuously adjacent to the reference finger strip in the target direction; according to the weighted value of each signal finger of the apodization interdigital transducer, if the sum of the weighted values of k signal fingers and a reference finger is larger than the normalized weighted value, dividing the kth signal finger of the k signal fingers into an upper section finger and a lower section finger according to the weighted values of the reference finger and k, so that the sum of the weighted values of the k-1 signal fingers and the lower section finger in the reference finger and k signal fingers is equal to the normalized weighted value, and then carrying out non-overlapping continuous arrangement on the k-1 signal fingers and the lower section signal fingers in the aperture direction of the apodization interdigital transducer of the reference finger and k signal fingers, so as to determine the distribution positions of the k-1 signal fingers and the lower section signal finger in the aperture direction of the apodization interdigital transducer; and then, repeating the steps by taking the upper section finger of the kth signal finger as a reference finger until the kth finger is the last signal finger of the apodization interdigital transducer in the target direction, and obtaining finger parameters of each signal finger in the left direction of the middle finger of the apodization interdigital transducer. And determining finger parameters of each signal finger on the right side of the middle finger of the apodization interdigital transducer according to the same manner by taking the adjacent signal finger on the right side of the middle finger as a reference finger, and not repeated herein. Thus, finger parameters for each finger of the apodized interdigital transducer can be obtained. The phase weighting processing of the signal fingers in the left and right directions of the middle finger may be sequentially performed or may be performed simultaneously, and the sequence is not limited.
Further, when the sum of the weighted values of the reference finger and the k signal fingers is exactly equal to the normalized weighted value, the reference finger and the k signal fingers are arranged in a non-overlapping manner in the aperture direction of the apodization interdigital transducer, and the distribution positions of the reference finger and the k signal fingers in the aperture of the apodization interdigital transducer can be determined. Finger parameters for each ground finger of the apodized transducer are determined based on finger parameters for each signal finger. When the plurality of signal fingers are arranged in succession in the aperture direction, the reference finger is directly connected to the upper bus bar with the upper bus bar as an arrangement start point.
Referring to fig. 3, fig. 3 is a schematic diagram showing a structure of signal fingers after phase-weighting the signal fingers of an apodized interdigital transducer, in which the signal fingers and a ground finger are arranged at intervals, the weighting value corresponding to the signal fingers is h (2 i-1), and when the signal fingers of the apodized interdigital transducer are phase-weighted, a plurality of signal fingers are continuously arranged in the aperture direction at the aperture positions thereof with reference to the middle finger until
If->
Repeating the arrangement of the finger strips in the aperture direction according to the aperture positions and the weighted values of the signal fingers from m+1 fingers; if it is 
Then normalize finger length +.>
The m-th finger is divided into upper and lower parts in the aperture direction. With repeated calculation, all signal fingers of the apodization transducer can be used for adjusting the apertureThe positions and the weighted numerical values are arranged in succession in the aperture direction. The weighted numerical and aperture position of each signal finger is the same as on the apodization transducer, except for the position in the aperture direction. And according to the distribution position of each finger of the apodization transducer in the aperture, namely the phase and the weighted value, completing the phase weighted design of the signal finger.
Further, referring to fig. 4, when the signal fingers are continuously arranged in the aperture direction, that is, when the signal fingers which are continuously arranged are connected, the finger length is the same as the aperture size, and the connected signal fingers are continuous in the aperture direction, an equal-finger long interdigital transducer which is the same as the aperture size is formed. Since the different signal fingers are located in different apertures, the signal fingers are in a discrete state as shown in figure 3 in the direction perpendicular to the apertures,
preferably, determining the finger parameters of the ground finger according to the finger parameters of the signal finger specifically includes:
step 3061, determining a piezoelectric gap of each signal finger based on finger parameters of the signal finger;
Step 3062, determining finger parameters of each ground finger of the apodized interdigital transducer according to the piezoelectric gap.
Specifically, the piezoelectric gap between the signal fingers is determined based on the finger parameters of each signal finger, and when the signal fingers arranged continuously in the aperture direction are connected, the finger parameters of each ground finger are determined based on the piezoelectric gap between two adjacent signal fingers having equal length to the aperture, as shown in fig. 4.
Referring to fig. 5, according to the positions and weight values of the connected signal fingers, the grounding fingers are designed among different fingers, and the principle of the design of the grounding fingers is to completely distribute the piezoelectric gaps of the connected signal fingers, as shown in fig. 5, the interval between the two different fingers of the grounding fingers and the signal fingers is the width d of the fingers, namely the width of a white area between the grounding fingers and the signal fingers in fig. 5. The fingers connected with the signal bus bar S are signal fingers, the fingers connected with the ground bus bar G are ground fingers, the signal fingers are the fingers which are sectionally continuous in the single aperture direction, the widths of the fingers of each section are equal, the ground fingers are the fingers with uneven single width distribution and larger width, and in fig. 5, the lengths of the single signal fingers and the ground fingers are the same as the aperture.
Further, the width of the ground fingers is varied, and a single ground finger may be equivalent to a plurality of ground fingers of the same number of segments as adjacent signal fingers, as shown in fig. 6. According to the weighted value of the signal finger and the distribution rule of the grounding finger, the weighted value of the j-th section signal finger can be determined to be h (2*j). The weighting value of the adjacent grounding finger of the j-th section signal finger is
Aperture size for the apodized transducer). For the convenience of calculation, if +.>
Then->
If->
H (2*j) =0. Thus, after the weighted value of each signal finger is determined, the weighted value of the ground finger is determined based on the aperture size and the spacing width d between the signal finger and the ground finger, and after the finger parameters of the signal finger are determined, the finger parameters of the ground finger are determined accordingly.
Preferably, in step 300, after phase weighting the finger of the apodization interdigital transducer in the aperture direction of the apodization interdigital transducer according to the weighted value to determine the finger parameters of each finger of the apodization interdigital transducer, the method further comprises:
step 401, determining a first frequency response of the surface acoustic wave filter according to the finger parameters;
Step 402, comparing the first frequency response with the target frequency response to determine whether the finger parameter meets a preset condition;
and step 403, if not, returning to and executing the step of performing apodization weighting on the interdigital transducer of the surface acoustic wave filter according to the target time domain signal to obtain an apodized interdigital transducer until the finger parameters meet the preset conditions.
Specifically, after finger parameters of each finger of the apodization interdigital transducer are determined, time domain responses of the apodization interdigital transducer can be determined according to the finger parameters of each finger, and frequency domain responses corresponding to the apodization interdigital transducer, namely first frequency domain responses, can be determined through fourier transformation. Comparing the frequency domain response with a target frequency domain response of the interdigital transducer, and determining whether the finger parameters meet preset conditions, namely determining whether the finger parameters meet expected design requirements; if the target time domain signal is not satisfied, the apodization weighting and the phase weighting are required to be carried out on the interdigital transducer again according to the acquired target time domain signal, so that new finger parameters are obtained until the obtained finger parameters satisfy the preset conditions. The preset condition may be that a difference between the first frequency domain response and the target frequency domain response is less than a preset threshold.
And (3) each segment in the single signal finger obtained by connection is equivalent to a finger, the equivalent finger number is the same as the segment number of the single signal finger, and the equivalent finger aperture position and the weighting value are the same as the segment corresponding to the equivalent signal finger. According to the segmentation number of the single signal finger and the weighted numerical value of each segment, the weighted numerical value of each finger strip after the equivalence and the distribution position in the aperture can be obtained. Similarly, according to the distribution positions and weighted values of the signal finger and the ground finger in the aperture, the time domain response corresponding to the interdigital transducer can be determined, and the inverse fourier transform shown in the following formula 1 is utilized, so as to obtain the frequency response corresponding to the interdigital transducer:
determining whether finger parameters of each finger of the apodized interdigital transducer meet requirements according to a comparison result of the frequency domain response and the target frequency domain response, if not, carrying out apodization weighting and phase weighting on the interdigital transducer again, and determining new finger parameters; if so, the interdigital transducer meeting the requirements can be designed based on the finger parameters, namely, the finger length and the aperture of each finger of the interdigital transducer are the same, the stop band inhibition can achieve the effect of the apodization transducer, the stop band inhibition of the surface acoustic wave filter is improved, the bandwidth application range of the surface acoustic wave filter is increased, and the apodization weighting loss is reduced.
In this embodiment, by setting a normalized weighting value of the apodization interdigital transducer, the finger strips of the apodization interdigital transducer are weighted in phase, and the number of segments and the distribution position of the finger strips in the aperture are determined, so that finger strips can be continuously arranged in the aperture direction, finger strip parameters with equal length in the connecting time domain aperture are obtained, the finger strips are segmented in the aperture direction, and the phase and the weighting amplitude of each segment are consistent with the finger strips of the apodization transducer. The novel phase weighting finger array with equal finger length is adopted to approach the weighting effect of the apodization transducer, so that the effect of apodization weighting is realized, the surface acoustic wave filter obtains high out-of-band suppression, and the bandwidth application range of the surface acoustic wave filter is increased.
Further, by conducting truncation processing on the time domain response signal of the surface acoustic wave filter, after determining finger parameters of each finger of the apodization interdigital transducer, comparing the frequency domain response corresponding to the finger parameters with the target frequency domain response expected by the surface acoustic wave filter, the effectiveness and the accuracy of the finger parameters are ensured.
It should be understood that, in the foregoing embodiments, the weighted value of the signal finger is first determined, and the signal finger is phase weighted to obtain the finger parameter of each signal finger, then the finger parameter of the ground finger is determined according to the finger parameter of the signal finger, which is only a preferred embodiment, and in practical application, the weighted value of the ground finger may be first determined, and in the same manner as the signal finger in the foregoing embodiments, the ground finger is phase weighted to determine the finger parameter of each ground finger, and then the finger parameter of the signal finger is determined according to the finger parameter of the ground finger.
In the above embodiments, the specific parameter values, such as normalized weighted values, are exemplary and not limiting the present invention.
The finger parameter determining apparatus of the interdigital transducer provided by the invention is described below, and the finger parameter determining apparatus of the interdigital transducer described below and the finger parameter determining method of the interdigital transducer described above can be referred to correspondingly.
Referring to fig. 7, a finger parameter determining apparatus for an interdigital transducer according to an embodiment of the present invention includes:
the apodization weighting module 10 is used for obtaining a target time domain signal of the surface acoustic wave filter, and apodizing and weighting the interdigital transducer of the surface acoustic wave filter according to the target time domain signal to obtain an apodized interdigital transducer;
a weighted value determining module 20, configured to determine a weighted value of each finger in the apodization interdigital transducer based on the aperture size of the apodization interdigital transducer;
a phase weighting module 30, configured to perform phase weighting on the finger of the apodization interdigital transducer in the aperture direction of the apodization interdigital transducer according to the weighted value, so as to determine a finger parameter of each finger of the apodization interdigital transducer; the finger parameters include finger length and finger position.
In one embodiment, the finger parameters further comprise a finger segment number, the finger length comprises the length of each segment of finger, and the finger position comprises the distribution position of each segment of finger in the aperture of the apodized interdigital transducer;
the finger strip of the apodization interdigital transducer comprises a signal finger and a grounding finger, and the apodization interdigital transducer further comprises an upper bus bar and a lower bus bar; the signal finger is connected with the upper bus bar in the aperture direction of the apodization interdigital transducer, and the grounding finger is connected with the lower bus bar in the aperture direction of the apodization interdigital transducer.
In one embodiment, the phase weighting module 30 is further configured to:
acquiring a normalized weighted value corresponding to the aperture size of the apodization interdigital transducer;
taking a target signal finger in each signal finger of the apodization interdigital transducer as a reference finger, and acquiring k signal fingers continuously adjacent to the reference finger in a target direction; the target direction is perpendicular to the aperture direction of the apodization interdigital transducer, and the target signal refers to a signal finger adjacent to the middle finger of the apodization interdigital transducer in the target direction;
dividing the kth signal finger of the k signal fingers into an upper segment signal finger and a lower segment signal finger according to the weighted value of the k signal fingers and the weighted value of the first k-1 signal fingers of the k signal fingers if the sum of the weighted value of the k signal fingers and the weighted value of the reference finger is larger than the normalized weighted value, so that the sum of the weighted values of the reference finger, the first k-1 signal fingers of the k signal fingers and the lower segment signal finger is equal to the normalized weighted value;
The reference finger strip, the first k-1 signal fingers in the k signal fingers and the lower segment signal fingers are arranged in a non-overlapping and continuous mode in the aperture direction of the apodization interdigital transducer so as to determine the distribution positions of the reference finger strip, the first k-1 signal fingers in the k signal fingers and the lower segment signal fingers in the aperture direction of the apodization interdigital transducer;
returning and executing the step of acquiring k signal fingers continuously adjacent to the reference finger in the target direction by taking the lower segment signal finger as the reference finger until the kth signal finger in the k signal fingers is the last signal finger of the apodization interdigital transducer in the target direction, so as to acquire finger parameters of each signal finger of the apodization interdigital transducer;
and determining finger parameters of each grounding finger of the apodized interdigital transducer based on the finger parameters of each signal finger.
In one embodiment, the phase weighting module 30 is further configured to:
determining a piezoelectric gap of each signal finger based on finger parameters of the signal finger;
and determining finger parameters of each grounding finger of the apodization interdigital transducer according to the piezoelectric gaps.
In one embodiment, the apodization weighting module 10 is further configured to:
sampling the target time domain signal to obtain sampling points corresponding to different time points of the target time domain signal;
and carrying out apodization weighting treatment on the interdigital transducer according to the position and the amplitude of the sampling point to obtain the apodization interdigital transducer.
In one embodiment, the apodization weighting module 10 is further configured to:
acquiring a target frequency response of the surface acoustic wave filter;
performing Fourier transform on the target frequency response to obtain a time domain response signal corresponding to the surface acoustic wave filter;
performing truncation processing on the time domain response signal based on a preset window function to obtain a target time domain signal; and the window width corresponding to the window function is the same as the period length of the interdigital transducer of the surface acoustic wave filter.
In one embodiment, the finger parameter determining apparatus of the interdigital transducer further comprises a post-parameter evaluation module for:
determining a first frequency response of the SAW filter based on the finger parameters;
comparing the first frequency response with the target frequency response to determine whether the finger parameter meets a preset condition;
And if not, returning to and executing the step of carrying out apodization weighting on the interdigital transducer of the surface acoustic wave filter according to the target time domain signal to obtain an apodized interdigital transducer until the finger parameters meet the preset conditions.
Fig. 8 illustrates a physical structure diagram of an electronic device, as shown in fig. 8, which may include: processor 810, communication interface (Cokkunications Interface) 820, memory (kekory) 830 and communication bus 840, wherein processor 810, communication interface 820, memory 830 accomplish communication with each other through communication bus 840. The processor 810 may invoke logic instructions in the memory 830 to perform a finger parameter determination method of an interdigital transducer, the method comprising:
acquiring a target time domain signal of a surface acoustic wave filter, and performing apodization weighting on an interdigital transducer of the surface acoustic wave filter according to the target time domain signal to obtain an apodization interdigital transducer;
determining a weighted numerical value of each finger in the apodization interdigital transducer by taking the aperture size of the apodization interdigital transducer as a reference;
carrying out phase weighting on the finger strips of the apodization interdigital transducer in the aperture direction of the apodization interdigital transducer according to the weighted numerical value so as to determine finger strip parameters of each finger strip of the apodization interdigital transducer; the finger parameters include finger length and finger position.
Further, the logic instructions in the memory 830 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only memory (ROk), a random access memory (RAk, randok Access kekory), a magnetic disk or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, the computer program product including a computer program, the computer program being storable on a non-transitory computer readable storage medium, the computer program, when executed by a processor, being capable of executing the finger parameter determining method of an interdigital transducer provided by the above methods, the method comprising:
Acquiring a target time domain signal of a surface acoustic wave filter, and performing apodization weighting on an interdigital transducer of the surface acoustic wave filter according to the target time domain signal to obtain an apodization interdigital transducer;
determining a weighted numerical value of each finger in the apodization interdigital transducer by taking the aperture size of the apodization interdigital transducer as a reference;
carrying out phase weighting on the finger strips of the apodization interdigital transducer in the aperture direction of the apodization interdigital transducer according to the weighted numerical value so as to determine finger strip parameters of each finger strip of the apodization interdigital transducer; the finger parameters include finger length and finger position.
In yet another aspect, the present invention further provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the method for determining finger parameters of an interdigital transducer provided by the above methods, the method comprising:
acquiring a target time domain signal of a surface acoustic wave filter, and performing apodization weighting on an interdigital transducer of the surface acoustic wave filter according to the target time domain signal to obtain an apodization interdigital transducer;
determining a weighted numerical value of each finger in the apodization interdigital transducer by taking the aperture size of the apodization interdigital transducer as a reference;
Carrying out phase weighting on the finger strips of the apodization interdigital transducer in the aperture direction of the apodization interdigital transducer according to the weighted numerical value so as to determine finger strip parameters of each finger strip of the apodization interdigital transducer; the finger parameters include finger length and finger position.
In still another aspect, the present invention further provides a surface acoustic wave filter, including an interdigital transducer, where the interdigital transducer is generated by using finger parameter designs determined by the finger parameter determining method of the interdigital transducer provided by the above methods.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROk/RAk, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the method described in the various embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of determining finger parameters for an interdigital transducer, the method comprising:
acquiring a target time domain signal of a surface acoustic wave filter, and performing apodization weighting on an interdigital transducer of the surface acoustic wave filter according to the target time domain signal to obtain an apodization interdigital transducer;
determining a weighted numerical value of each finger in the apodization interdigital transducer by taking the aperture size of the apodization interdigital transducer as a reference;
carrying out phase weighting on the finger strips of the apodization interdigital transducer in the aperture direction of the apodization interdigital transducer according to the weighted numerical value so as to determine finger strip parameters of each finger strip of the apodization interdigital transducer; the finger parameters include finger length and finger position.
2. The interdigital transducer finger parameter determination method of claim 1, wherein the finger parameter further comprises a finger segment number, the finger length comprises the length of each segment of finger, and the finger position comprises the distribution position of each segment of finger in the aperture of the apodized interdigital transducer;
the finger strip of the apodization interdigital transducer comprises a signal finger and a grounding finger, and the apodization interdigital transducer further comprises an upper bus bar and a lower bus bar; the signal finger is connected with the upper bus bar in the aperture direction of the apodization interdigital transducer, and the grounding finger is connected with the lower bus bar in the aperture direction of the apodization interdigital transducer.
3. The finger parameter determining method of an interdigital transducer according to claim 2, wherein said phase weighting the finger of the apodized interdigital transducer in the aperture direction of the apodized interdigital transducer according to the weighting value to determine the finger parameter of each finger of the apodized interdigital transducer, comprises:
acquiring a normalized weighted value corresponding to the aperture size of the apodization interdigital transducer;
taking a target signal finger in each signal finger of the apodization interdigital transducer as a reference finger, and acquiring k signal fingers continuously adjacent to the reference finger in a target direction; the target direction is perpendicular to the aperture direction of the apodization interdigital transducer, and the target signal refers to a signal finger adjacent to the middle finger of the apodization interdigital transducer in the target direction;
Dividing the kth signal finger of the k signal fingers into an upper segment signal finger and a lower segment signal finger according to the weighted value of the k signal fingers and the weighted value of the first k-1 signal fingers of the k signal fingers if the sum of the weighted value of the k signal fingers and the weighted value of the reference finger is larger than the normalized weighted value, so that the sum of the weighted values of the reference finger, the first k-1 signal fingers of the k signal fingers and the lower segment signal finger is equal to the normalized weighted value;
the reference finger strip, the first k-1 signal fingers in the k signal fingers and the lower segment signal fingers are arranged in a non-overlapping and continuous mode in the aperture direction of the apodization interdigital transducer so as to determine the distribution positions of the reference finger strip, the first k-1 signal fingers in the k signal fingers and the lower segment signal fingers in the aperture direction of the apodization interdigital transducer;
returning and executing the step of acquiring k signal fingers continuously adjacent to the reference finger in the target direction by taking the lower segment signal finger as the reference finger until the kth signal finger in the k signal fingers is the last signal finger of the apodization interdigital transducer in the target direction, so as to acquire finger parameters of each signal finger of the apodization interdigital transducer;
And determining finger parameters of each grounding finger of the apodized interdigital transducer based on the finger parameters of each signal finger.
4. The interdigital transducer finger parameter determination method of claim 3, wherein the determining finger parameters of each ground finger of the apodized interdigital transducer based on the finger parameters of each signal finger comprises:
determining a piezoelectric gap of each signal finger based on finger parameters of the signal finger;
and determining finger parameters of each grounding finger of the apodization interdigital transducer according to the piezoelectric gaps.
5. The method for determining finger parameters of an interdigital transducer according to claim 1, wherein the step of apodizing and weighting the interdigital transducer of the surface acoustic wave filter according to the target time domain signal to obtain an apodized interdigital transducer comprises the steps of:
sampling the target time domain signal to obtain sampling points corresponding to different time points of the target time domain signal;
and carrying out apodization weighting treatment on the interdigital transducer according to the position and the amplitude of the sampling point to obtain the apodization interdigital transducer.
6. The interdigital transducer finger parameter determination method of claim 1, wherein the acquiring the target time domain signal of the surface acoustic wave filter comprises:
Acquiring a target frequency response of the surface acoustic wave filter;
performing Fourier transform on the target frequency response to obtain a time domain response signal corresponding to the surface acoustic wave filter;
performing truncation processing on the time domain response signal based on a preset window function to obtain a target time domain signal; and the window width corresponding to the window function is the same as the period length of the interdigital transducer of the surface acoustic wave filter.
7. The method for determining finger parameters of an interdigital transducer according to claim 6, wherein after phase-weighting the finger of the apodized interdigital transducer in the aperture direction of the apodized interdigital transducer according to the weighting value to determine finger parameters of each finger of the apodized interdigital transducer, further comprising:
determining a first frequency response of the SAW filter based on the finger parameters;
comparing the first frequency response with the target frequency response to determine whether the finger parameter meets a preset condition;
and if not, returning to and executing the step of carrying out apodization weighting on the interdigital transducer of the surface acoustic wave filter according to the target time domain signal to obtain an apodized interdigital transducer until the finger parameters meet the preset conditions.
8. A finger parameter determining apparatus for an interdigital transducer, comprising:
the apodization weighting module is used for obtaining a target time domain signal of the surface acoustic wave filter, and apodization weighting is carried out on the interdigital transducer of the surface acoustic wave filter according to the target time domain signal to obtain an apodization interdigital transducer;
the weighted numerical value determining module is used for determining the weighted numerical value of each finger in the apodization interdigital transducer by taking the aperture size of the apodization interdigital transducer as a reference;
the phase weighting module is used for carrying out phase weighting on the finger strips of the apodization interdigital transducer in the aperture direction of the apodization interdigital transducer according to the weighted numerical value so as to determine finger strip parameters of each finger strip of the apodization interdigital transducer; the finger parameters include finger length and finger position.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the finger parameter determination method of the interdigital transducer of any one of claims 1 to 7 when the program is executed.
10. A surface acoustic wave filter comprising an interdigital transducer which is generated using the finger parameter design determined by the finger parameter determination method of the interdigital transducer according to any one of claims 1 to 7.
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