CN118070730B - Automatic modeling, simulating and optimizing method for microstrip filter circuit - Google Patents
Automatic modeling, simulating and optimizing method for microstrip filter circuit Download PDFInfo
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Abstract
The invention provides an automatic modeling simulation optimization method of a microstrip filter circuit, which belongs to the field of automatic modeling simulation, and comprises the following steps of S1, writing a design software calling program, a modeling program and a performance parameter solving program by using computing software, and generating a function script; step S2, a microstrip filter circuit model comprising a microstrip line structure is obtained, simulation is carried out according to the microstrip filter circuit model to solve the performance parameters, the solved performance parameters are transmitted back to calculation software through a function script, the calculation software adjusts the length, the left-right spacing and the up-down spacing of the microstrip line structure in sequence according to the comparison result of the performance parameters and preset target performance parameters, and the design software models again according to the data after each adjustment and solves the performance parameters until the solved performance parameters are consistent with the target performance parameters; and step S3, saving a microstrip filter circuit model and a performance parameter solving report. The invention can remarkably improve modeling efficiency and greatly reduce labor cost.
Description
Technical Field
The invention belongs to the field of automatic modeling simulation, and particularly relates to an automatic modeling simulation optimization method for a microstrip filter circuit.
Background
The computer aided design software can establish a corresponding 3D model according to the designed parameters of the microstrip filter circuit, and can simulate the microstrip filter circuit according to the model based on a finite element algorithm so as to obtain the performance parameters (S parameters) of the microstrip filter circuit.
However, the microstrip filter circuit 3D modeling method requires a designer to have higher proficiency in computer aided design software, and structural parameters of a functional structure group of a circuit set by the designer are difficult to reach design requirements once after being solved in the computer aided design software, so that the structural parameters are required to be continuously optimized. The optimization algorithm of the computer aided design software is a universal algorithm, and if the optimization algorithm is applied to a microstrip filter circuit, a plurality of defects exist: if the algorithm cannot find out the key structural parameters rapidly, the change direction and range of the structural parameters can only be tried mechanically continuously, when more structural parameters need to be optimized, the required structural parameters can be optimized usually in 3 to 5 days, the change step length of the algorithm is smaller than 0.001m, and the precision cannot be achieved in the actual process manufacturing, so that the optimization result is not practical.
Of course, the designer with abundant experience in the prior art can judge the key structural parameters relatively quickly, and judge the variation of the structural parameters to be optimized next according to the optimized performance parameters, in this case, the whole optimization process is relatively quick without trying one by one as in the general algorithm, but the method is too much dependent on manpower, so that the designer is required to have quite abundant experience, and the designer is required to pay attention to the optimization process continuously, so that much time and effort are required to be invested.
Disclosure of Invention
The invention aims to provide an automatic modeling simulation optimization method for a microstrip filter circuit, which can remarkably improve modeling efficiency, greatly reduce the artificial dependence of the optimization process and reduce labor cost.
The invention is realized by the following technical scheme:
A microstrip filter circuit automatic modeling simulation optimization method comprises the following steps:
Step S1, according to the designed microstrip filter circuit parameters, programming a design software calling program, a modeling program and a performance parameter solving program by using computing software, and generating a function script;
S2, calling design software by using a function script to realize automatic modeling to obtain a microstrip filter circuit model comprising a microstrip line structure, simulating according to the microstrip filter circuit model to solve performance parameters, returning the solved performance parameters to calculation software by using the function script, and adjusting the length, left-right spacing and up-down spacing of the microstrip line structure by the calculation software according to a comparison result of the performance parameters and preset target performance parameters, wherein the design software models again according to the data after each adjustment and solves the performance parameters until the solved performance parameters are consistent with the target performance parameters;
And step S3, saving a microstrip filter circuit model and a performance parameter solving report.
Further, the microstrip line structure includes a plurality of microstrip line groups, each microstrip line group includes two microstrip lines of staggered arrangement, each microstrip line has two longitudinal strips of parallel arrangement and a transverse strip connected between one ends of the two longitudinal strips, one longitudinal strip of one microstrip line is inserted between two longitudinal strips of the other microstrip line, the length is the length of each microstrip line, the left-right spacing includes the distance between two identical-side longitudinal strips of two microstrip lines of the same microstrip line group and the distance between two adjacent longitudinal strips of two adjacent microstrip line groups, the up-down spacing includes a plurality of sub-up-down spacing respectively corresponding to each microstrip line group, and the sub-up-down spacing includes the distance between the longitudinal strip and the transverse strip closest to the distance.
Further, in the step S2, the performance parameters obtained by performing simulation according to the microstrip filter circuit model include a simulated center frequency point, a simulated frequency band bandwidth and a simulated insertion loss, and the target performance parameters include a target center frequency point, a target frequency band bandwidth and a target insertion loss obtained by the microstrip filter circuit designed in the step S1.
Further, in the step S2, the calculating software adjusts the length, the left-right spacing and the up-down spacing of the microstrip line structure in sequence according to the comparison result of the performance parameter and the preset target performance parameter, and specifically includes the following steps:
s21, calling design software by using a function script to realize automatic modeling to obtain a microstrip filter circuit model comprising a microstrip line structure, and carrying out simulation according to the microstrip filter circuit model to solve performance parameters, wherein the solved performance parameters are transmitted back to calculation software through the function script;
step S22, the calculated software compares the solved performance parameters with target performance parameters, when the simulation center frequency point is different from the target center frequency point, the step S23 is carried out, when the simulation center frequency point is the same as the target center frequency point and the simulation frequency band width is different from the target frequency band width, the step S24 is carried out, and when the simulation center frequency point is the same as the target center frequency point, the simulation frequency band width is the same as the target frequency band width and the simulation insertion loss is different from the target insertion loss, the step S25 is carried out;
step S23, when the simulation center frequency point is smaller than the target center frequency point, the length of the microstrip line is reduced by a first step length, the step S21 is entered, and when the simulation center frequency point is larger than the target center frequency point, the length of the microstrip line is increased by the first step length, the step S21 is entered;
Step S24, when the simulated frequency band width is smaller than the target frequency band width, increasing the left-right spacing by a second step length, entering step S21, and when the simulated frequency band width is larger than the target frequency band width, reducing the left-right spacing by the second step length, entering step S21;
Step S25, increasing the first sub up-down spacing by a third step length, modeling and simulating by design software according to the increased sub up-down spacing, and if the simulated insertion loss is closer to the target insertion loss, continuing to repeat the step until an inflection point of the simulated insertion loss, which is changed from the near target insertion loss to the far target insertion loss, is found, wherein the first sub up-down spacing is the optimal up-down spacing of the microstrip line group corresponding to the first sub up-down spacing; let l=l+1, repeat this step until determining the optimal up-down spacing of all microstrip line sets; wherein, microstrip with l being more than or equal to 1 number of wire sets.
Further, in the step S2, the first step size is 0.005mm, the second step size is 0.005mm, and the third step size is 0.001mm.
Further, in the step S1, the modeling procedure includes setting a material property parameter, an overall product size, an input/output end size, and a length, a left-right pitch, and an up-down pitch of the microstrip line structure.
Further, the design software is EPCD software, and the calculation software is SCILAB software.
The invention has the following beneficial effects:
1. According to the invention, a calling program, a modeling program and a performance parameter solving program are written by using computing software, a function script is generated, then automatic modeling is realized by calling design software, simulation is carried out according to an established model, the performance parameters obtained by simulation solving are transmitted back to the computing software, the computing software sequentially adjusts the length, the left-right spacing and the up-down spacing of the microstrip line structure according to the comparison result of the performance parameters and preset target performance parameters, the design software models again according to the data after each adjustment and solves the performance parameters until the solved performance parameters are consistent with the target performance parameters, and finally a microstrip filter circuit model is obtained.
Drawings
The invention is described in further detail below with reference to the accompanying drawings.
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a diagram of a microstrip filter circuit according to the present invention.
Fig. 3 is a schematic diagram of a 3D model of a microstrip filter circuit diagram according to the present invention.
FIG. 4 is a graph of performance parameters corresponding to the initial modeling of the present invention.
FIG. 5 is a graph of corresponding performance parameters after optimization according to the present invention.
Detailed Description
As shown in fig. 1, the automatic modeling simulation optimization method of the microstrip filter circuit comprises the following steps:
Step S1, according to the designed microstrip filter circuit parameters, programming a design software calling program, a modeling program and a performance parameter solving program by using computing software, and generating a function script;
The modeling program comprises setting material property parameters, overall size of the product, size of input and output ends, length of the microstrip line structure, left-right spacing and up-down spacing.
S2, calling design software by using a function script to realize automatic modeling to obtain a microstrip filter circuit model comprising a microstrip line structure, simulating according to the microstrip filter circuit model to solve performance parameters, returning the solved performance parameters to calculation software by using the function script, and adjusting the length, left-right spacing and up-down spacing of the microstrip line structure by the calculation software according to a comparison result of the performance parameters and preset target performance parameters, wherein the design software models again according to the data after each adjustment and solves the performance parameters until the solved performance parameters are consistent with the target performance parameters;
in this embodiment, as shown in fig. 3, the microstrip line structure includes four microstrip line groups, the first microstrip line group includes a microstrip line A1 and a microstrip line A2 which are arranged in a staggered manner, the second microstrip line group includes a microstrip line A3 and a microstrip line A4 which are arranged in a staggered manner, the third microstrip line group includes a microstrip line A5 and a microstrip line A6 which are arranged in a staggered manner, the fourth microstrip line group includes a microstrip line A7 and a microstrip line A8 which are arranged in a staggered manner, the microstrip lines A1 to a microstrip line A8 have the same structure, and each has two longitudinal strips 11 which are arranged in parallel and a transverse strip 12 which is connected between one ends of the two longitudinal strips 11; the structures of the microstrip line groups are the same, taking the first microstrip line group as an example, one longitudinal strip 11 of the microstrip line A2 is inserted between two longitudinal strips 11 of the microstrip line A1, the lengths of the microstrip line structures refer to the lengths of the microstrip line A1, the microstrip line A2, … and the microstrip line A8, the left-right spacing of the microstrip line structure is represented by S 1,2,S3,4,S5,6,S7,8,S2,3,S4,5,S6,7, S 1,2 is the distance between two identical-side longitudinal strips 11 of the microstrip line A1 and the microstrip line A2, S 3,4 is the distance between two identical-side longitudinal strips 11 of the microstrip line A3 and the microstrip line A4, S 5,6 is the distance between two identical-side longitudinal strips 11 of the microstrip line A5 and the microstrip line A6, S 7,8 is the distance between two identical-side longitudinal strips 11 of the microstrip line A7 and the microstrip line A8, S 4,5 is the distance between two adjacent longitudinal strips 11 of the microstrip line A4 and the microstrip line A5, S 6,7 is the distance between two adjacent longitudinal strips 11 of the microstrip line A6 and the microstrip line A6, and the distance between two adjacent microstrip lines of the microstrip line A35 includes the upper and lower microstrip line 35 is the distance between the microstrip line and the upper and lower microstrip line of the microstrip line group.
The performance parameters of the simulation solution comprise a simulation center frequency point, a simulation frequency band bandwidth and a simulation insertion loss, and the target performance parameters comprise a target center frequency point, a target frequency band bandwidth and a target insertion loss which are obtained by the microstrip filter circuit designed according to the step S1.
The calculation software adjusts the length, the left-right spacing and the up-down spacing of the microstrip line structure in sequence according to the comparison result of the performance parameter of the simulation solution and the preset target performance parameter, and specifically comprises the following steps:
s21, calling design software by using a function script to realize automatic modeling to obtain a microstrip filter circuit model comprising a microstrip line structure, and carrying out simulation according to the microstrip filter circuit model to solve performance parameters, wherein the solved performance parameters are transmitted back to calculation software through the function script;
step S22, the calculated software compares the solved performance parameters with target performance parameters, when the simulation center frequency point is different from the target center frequency point, the step S23 is carried out, when the simulation center frequency point is the same as the target center frequency point and the simulation frequency band width is different from the target frequency band width, the step S24 is carried out, and when the simulation center frequency point is the same as the target center frequency point, the simulation frequency band width is the same as the target frequency band width and the simulation insertion loss is different from the target insertion loss, the step S25 is carried out;
Step S23, when the simulation center frequency point is smaller than the target center frequency point, the length of the microstrip line 1 is reduced by a first step length, the step S21 is entered, and when the simulation center frequency point is larger than the target center frequency point, the length of the microstrip line 1 is increased by the first step length, the step S21 is entered;
Step S24, when the simulated frequency band width is smaller than the target frequency band width, increasing the left-right spacing by a second step length, entering step S21, and when the simulated frequency band width is larger than the target frequency band width, reducing the left-right spacing by the second step length, entering step S21;
step S25, increasing the first sub up-down spacing by a third step length, modeling and simulating by design software according to the increased sub up-down spacing, and if the simulated insertion loss is closer to the target insertion loss, continuing to repeat the step until an inflection point of the simulated insertion loss, which is changed from the near target insertion loss to the far target insertion loss, is found, wherein the first sub up-down spacing is the optimal up-down spacing of the microstrip line group corresponding to the first sub up-down spacing; let l=l+1, repeat this step until determining the optimal up-down spacing of all microstrip line sets; wherein l is more than or equal to 1 and less than or equal to 4.
In this embodiment, the first step is 0.005mm, the second step is 0.005mm, and the third step is 0.001mm.
And step S3, saving a microstrip filter circuit model and a performance parameter solving report.
In this embodiment, the design software is EPCD software and the calculation software is SCILAB software.
More specifically, the microstrip filter circuit designed in this embodiment is a low-pass prototype filter as shown in fig. 2, the target bandwidth is 12.2GHz-14.2GHz, and the insertion loss is less than or equal to 2.0dB within 12.2GHz-14.2 GHz; at 10.8GHz or 15.7GHz, the insertion loss is more than or equal to 40.0dB.
Converting the low-pass prototype filter into a band-pass filter circuit: Wherein, the method comprises the steps of, wherein, As a low-pass prototype frequency variation,Is a frequency variable of the band-pass filter circuit,And (3) withFor the initial frequency, relative bandwidthThe chebyshev low-pass prototype filter is selected according to design requirements, the number n=8 of microstrip filter circuit groups is selected (g n and g n+1 form a microstrip filter circuit), and the designed element values are shown in table 1:
TABLE 1
| N is a value | g1 | g2 | g3 | g4 | g5 | g6 | g7 | g8 | g9 |
| 8 | 2.8733 | 0.9151 | 3.8948 | 0.9605 | 3.9335 | 0.9510 | 3.7477 | 0.7016 | 4.0957 |
The external coupling coefficient isG n represents the normalized values of the elements (the data in Table 1 are given in Table 2.6-1 of the Structure and design of modern microwave filters);
The length of the functional structure group is WhereinFor the electrical length of the device,R represents the characteristic impedance of the input and output ends, and is fixed to be 50Ω in the embodiment;
the design result can be obtained from the following formula:
product size: l=6.0 mm, w=3.0 mm, h=0.26 mm;
input/output end: l 0=0.612mm,W0 =0.2 mm;
The length L n (mm) and width W n (mm) dimensions of the microstrip lines A1 to A8 are shown in table 2:
TABLE 2
| A1 | A2 | A3 | A4 | A5 | A6 | A7 | A8 | |
| Ln(mm) | 4.762 | 4.692 | 4.796 | 4.815 | 4.815 | 4.796 | 4.692 | 4.762 |
| Wn(mm) | 0.14 | 0.14 | 0.14 | 0.14 | 0.14 | 0.14 | 0.14 | 0.14 |
The length of each microstrip line is the sum of the lengths of the two longitudinal strips 11 and the length of the transverse strip 12, as shown in fig. 3, the length of the microstrip line A8 is L 8=2L81+L82, and the lengths of the microstrip lines A1 to A7 are calculated according to the length; the width of the longitudinal strips 11 and the width of the transverse strips 12 of each microstrip line are the same, and the width is the width of the microstrip line;
The left-right spacing S n,n+1 and the up-down spacing D n,n+1 of the microstrip line structure are most affected by the coupling coefficient K i,i+1,
，
The correspondence table of the left-right spacing S n,n+1 and the coupled coefficient K i,i+1 of the microstrip line structure is shown in table 3:
TABLE 3 Table 3
The correspondence table of the up-down distance D n,n+1 of the microstrip line structure and the coupled coefficient K i,i+1 is shown in table 4:
TABLE 4 Table 4
Wave port size: l B=12*W0,HB =10×hmm;
Air box dimensions: l K=L,WK=W,HK =12×h.
The microstrip filter circuit model obtained by primary modeling simulation is shown in figure 3, and the size of the model is consistent with the designed size;
the performance parameters obtained by the primary modeling simulation microstrip filter circuit are shown in figure 4;
the microstrip line structure parameters of the microstrip filter circuit reaching the performance parameter target value (i.e. after optimization) are shown in table 5:
TABLE 5
In fig. 4, the passband start-stop frequency points m1 and m2 are shifted to low frequency in the whole, and the center frequency point is smaller than 13.2GHz, so that the length of the microstrip line 1 needs to be reduced to enable the center frequency point to reach 13.5GHz, as shown in fig. 5; in fig. 4, the effective bandwidth (i.e., m6-m5, m5 and m6 are the start-stop frequency points of the effective passband) is smaller than 2.2GHz, so the distance between microstrip lines 1 needs to be increased to make the bandwidth reach m 2-m1=2.4 GHz, as shown in fig. 5, m5 coincides with m1, and m6 coincides with m 2; in fig. 4, the insertion loss in the pass bands m1 to m2 is equal to or greater than 2.0dB, and the insertion loss at the out-of-band rejection point m3=10.8 GHz and at the out-of-band rejection point m4=15.7 GHz is equal to or less than 40.0dB, and then the up-down spacing of the microstrip line 1 needs to be reduced, so that the insertion loss at the two out-of-band rejection points m3 and m4 is equal to or greater than 40.0dB, as shown in fig. 5.
After the design requirement is clear, microstrip filter circuit model size data are obtained through a design process, model size, wave port size, air box size and solving frequency range are used as variables to be input into a modeling solving optimization program of computer aided calculation software, and then a microstrip filter circuit model and performance parameter solving report which is consistent with the target S parameter can be obtained in the computer aided design software.
The foregoing description is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, i.e., the invention is not to be limited to the details of the claims and the description, but rather is to cover all modifications which are within the scope of the invention.
Claims (4)
1. The automatic modeling, simulating and optimizing method for the microstrip filter circuit is characterized by comprising the following steps of: the method comprises the following steps:
Step S1, according to the designed microstrip filter circuit parameters, programming a design software calling program, a modeling program and a performance parameter solving program by using computing software, and generating a function script;
S2, calling design software by using a function script to realize automatic modeling to obtain a microstrip filter circuit model comprising a microstrip line structure, simulating according to the microstrip filter circuit model to solve performance parameters, returning the solved performance parameters to calculation software by using the function script, and adjusting the length, left-right spacing and up-down spacing of the microstrip line structure by the calculation software according to a comparison result of the performance parameters and preset target performance parameters, wherein the design software models again according to the data after each adjustment and solves the performance parameters until the solved performance parameters are consistent with the target performance parameters;
s3, saving a microstrip filter circuit model and a performance parameter solving report;
The microstrip line structure comprises a plurality of microstrip line groups, each microstrip line group comprises two microstrip lines which are arranged in a staggered way, each microstrip line comprises two longitudinal strips which are arranged in parallel and a transverse strip which is connected between one ends of the two longitudinal strips, one longitudinal strip of one microstrip line is inserted between the two longitudinal strips of the other microstrip line, the length is the length of each microstrip line, the left-right spacing comprises the distance between two identical-side longitudinal strips of two microstrip lines of the same microstrip line group and the distance between two adjacent longitudinal strips of two adjacent microstrip line groups, the up-down spacing comprises a plurality of sub-up-down spacing which respectively corresponds to each microstrip line group, and the sub-up-down spacing comprises the distance between the longitudinal strip and the transverse strip which is closest to the longitudinal strip;
In the step S2, the performance parameters obtained by performing simulation according to the microstrip filter circuit model include a simulation center frequency point, a simulation frequency band bandwidth and a simulation insertion loss, and the target performance parameters include a target center frequency point, a target frequency band bandwidth and a target insertion loss obtained by the microstrip filter circuit designed in the step S1;
In step S2, the calculating software adjusts the length, the left-right spacing, and the up-down spacing of the microstrip line structure in sequence according to the comparison result of the performance parameter and the preset target performance parameter, and specifically includes the following steps:
Step S21, the calculated software compares the solved performance parameters with target performance parameters, when the simulation center frequency point is different from the target center frequency point, the step S22 is carried out, when the simulation center frequency point is the same as the target center frequency point and the simulation frequency band width is different from the target frequency band width, the step S23 is carried out, and when the simulation center frequency point is the same as the target center frequency point, the simulation frequency band width is the same as the target frequency band width and the simulation insertion loss is different from the target insertion loss, the step S24 is carried out;
Step S22, when the simulation center frequency point is smaller than the target center frequency point, the length of the microstrip line is reduced by a first step length, and when the simulation center frequency point is larger than the target center frequency point, the length of the microstrip line is increased by the first step length;
step S23, when the simulated frequency band bandwidth is smaller than the target frequency band bandwidth, increasing the left-right spacing by a second step length, and when the simulated frequency band bandwidth is larger than the target frequency band bandwidth, reducing the left-right spacing by the second step length;
Step S24, increasing the M-th sub-up-down spacing by a third step, modeling and simulating by design software according to the increased sub-up-down spacing, and if the simulated insertion loss is closer to the target insertion loss, continuing to repeat the step until an inflection point of the simulated insertion loss, which is changed from the near target insertion loss to the far target insertion loss, is found, wherein the M-th sub-up-down spacing is the optimal up-down spacing of the corresponding microstrip line group; let m=m+1, repeat this step until determining the optimal up-down spacing of all microstrip line sets; wherein, microstrip with M being more than or equal to 1 and less than or equal to number of wire sets.
2. The automatic modeling, simulation and optimization method for the microstrip filter circuit according to claim 1, wherein the method comprises the following steps: in the step S2, the first step length is 0.005mm, the second step length is 0.005mm, and the third step length is 0.001mm.
3. The automatic modeling simulation optimization method of the microstrip filter circuit according to any one of claims 1 to 2, wherein the method comprises the following steps: in the step S1, the modeling procedure includes setting a material property parameter, an overall product size, an input/output end size, and a length, a left-right pitch, and an up-down pitch of the microstrip line structure.
4. The automatic modeling simulation optimization method of the microstrip filter circuit according to any one of claims 1 to 2, wherein the method comprises the following steps: the design software is ePCD software, and the calculation software is Scilab software.
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| CN117473931A (en) * | 2023-12-28 | 2024-01-30 | 贝叶斯电子科技(绍兴)有限公司 | Circuit performance modeling method and device based on analog IC topological structure fine adjustment |
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