Dielectric waveguide filter design method, dielectric waveguide filter, system, terminal and dielectric

Abstract

The invention discloses a dielectric waveguide filter design method, a dielectric waveguide filter, a system, a terminal and a dielectric, the dielectric waveguide filter design method comprises the steps that a blind hole structure is introduced into a four-corner element filter to form a pentagonal element filter, and the blind hole structure is used for generating an additional transmission zero point; carrying out admittance parameter analysis on the pentagonal element filter to obtain parameter information of the pentagonal element filter; constructing a polynomial according to the parameter information, and obtaining a coupling matrix according to the polynomial; and obtaining a target design according to the coupling matrix, and obtaining the dielectric waveguide filter according to the target design. According to the invention, the blind holes are regarded as resonators, so that the use of a negative coupling structure is avoided, the occurrence of cross coupling is reduced, and the design and processing difficulty of the filter is simplified.

Description

Technical Field

[0001] The present application relates to the field of filters and microwave communication technology, and in particular to a dielectric waveguide filter design method, a dielectric waveguide filter, a system, a terminal and a medium. Background Art

[0002] In recent years, achieving more transmission zeros under simple topology conditions to improve the sideband roll-off and out-of-band suppression of microwave filters has become a research hotspot. Recently, the improved generalized Chebyshev function was used for microwave filter synthesis, which can achieve a linear topology and generate multiple transmission zeros at both ends of the passband. However, there is currently no synthesis and design method for dielectric waveguide filters to generate more transmission zeros under simple topology conditions. In addition, in the filter design process, a negative coupling structure is usually required. However, the negative coupling structure will significantly increase the complexity of the filter design and increase the processing cost.

[0003] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0004] The main purpose of the present application is to provide a dielectric waveguide filter design method, a dielectric waveguide filter, a system, a terminal and a medium, aiming to solve the problems of negative coupling and cross coupling that occur when designing dielectric waveguide filters in the prior art.

[0005] A first aspect of an embodiment of the present application provides a dielectric waveguide filter design method, the dielectric waveguide filter design method comprising the following steps: introducing a blind hole structure into a four-corner element filter to form a five-corner element filter, wherein the blind hole structure is used to generate an additional transmission zero point; performing an admittance parameter analysis on the five-corner element filter to obtain parameter information of the five-corner element filter; constructing a polynomial according to the parameter information, and obtaining a coupling matrix according to the polynomial; obtaining a target design according to the coupling matrix, and obtaining a dielectric waveguide filter according to the target design.

[0006] Optionally, in one embodiment of the present application, the pentagonal element filter includes a first structure and a second structure; the admittance parameter analysis of the pentagonal element filter to obtain parameter information of the pentagonal element filter specifically includes: establishing an expression for the admittance parameters of the first structure and an expression for the admittance parameters of the second structure; determining the residues and poles corresponding to each of the two expressions, wherein the residues of the two expressions satisfy a preset relationship; and extracting the parameter information of the pentagonal element filter based on the residues and poles corresponding to each of the two expressions.

[0007] Optionally, in one embodiment of the present application, the expression of the admittance parameter of the first structure is: ; The expression of the admittance parameter of the second structure is: ; The preset relationship is: , , ; in, is the admittance parameter of the first structure, is an imaginary unit, is a constant, is a complex frequency variable, and represents the poles of the first structure, and Corresponding to and The residue of is the admittance parameter of the second structure, represents the poles of the second structure, To correspond to The remainder of .

[0008] Optionally, in one embodiment of the present application, the parameter information includes a transmission zero point position and a complex reflection zero point position, and the polynomial includes a first polynomial, a second polynomial and a third polynomial; constructing a polynomial according to the parameter information specifically includes: constructing a first polynomial according to the transmission zero point position, and constructing a second polynomial according to the complex reflection zero point position; and obtaining a third polynomial according to the first polynomial and the second polynomial.

[0009] Optionally, in one embodiment of the present application, obtaining the coupling matrix according to the polynomial specifically includes: constructing an admittance matrix according to the first polynomial, the second polynomial and the third polynomial; expanding the admittance matrix into a fractional form related to each node of the filter and the source and load; obtaining a coupling coefficient according to the fractional form, and obtaining a coupling matrix according to the coupling coefficient.

[0010] Optionally, in one embodiment of the present application, the blind hole structure serves as a resonator that resonates below the passband; the target design includes the position and size of each resonator; and obtaining the target design according to the coupling matrix and obtaining the dielectric waveguide filter according to the target design are specifically as follows: determining the position and size of each resonator according to the coupling matrix, and obtaining the dielectric waveguide filter according to the position and size design of each resonator.

[0011] A second aspect of an embodiment of the present application further provides a dielectric waveguide filter, wherein the dielectric waveguide filter is designed according to a dielectric waveguide filter design method as described in any one of the above schemes.

[0012] A third aspect of the embodiment of the present application further provides a dielectric waveguide filter design system, wherein the dielectric waveguide filter design system is applied to the dielectric waveguide filter design method described in any one of the above schemes, and the dielectric waveguide filter design system includes: A blind hole introduction module, used for introducing a blind hole structure into a four-corner element filter to form a five-corner element filter, wherein the blind hole structure is used to generate an additional transmission zero point; An admittance parameter analysis module, used for performing admittance parameter analysis on the pentagonal element filter to obtain parameter information of the pentagonal element filter; A coupling matrix solving module, used for constructing a polynomial according to the parameter information, and obtaining a coupling matrix according to the polynomial; The waveguide design module is used to obtain a target design according to the coupling matrix, and obtain a dielectric waveguide filter according to the target design.

[0013] A fourth aspect of an embodiment of the present application further provides a terminal, wherein the terminal includes: a memory, a processor, and a dielectric waveguide filter design program stored in the memory and executable on the processor, wherein the dielectric waveguide filter design program implements the steps of the dielectric waveguide filter design method as described above when executed by the processor.

[0014] A fifth aspect of an embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a dielectric waveguide filter design program, and when the dielectric waveguide filter design program is executed by a processor, the steps of the dielectric waveguide filter design method as described above are implemented.

[0015] Beneficial effects: The present application provides a dielectric waveguide filter design method, a dielectric waveguide filter, a system, a terminal and a medium. The present application avoids the use of a negative coupling structure and reduces the occurrence of cross-coupling by regarding a blind hole as a resonator, thereby simplifying the filter design and processing difficulty. In addition, on the basis of two finite transmission zeros generated by the original four-corner elements, an additional finite transmission zero at an arbitrary position is generated, thereby improving key indicators of the dielectric waveguide filter such as sideband roll-off and stopband suppression. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a flow chart of a preferred embodiment of the dielectric waveguide filter design method of the present application; Figure 2 It is a schematic diagram of the traditional four-corner component topology; Figure 3 It is a schematic diagram of the topological structure of the pentagonal element of the present application; Figure 4 It is a simplified schematic diagram of the topological structure of the pentagonal element of the present application; Figure 5 This is a near-band frequency response waveform diagram of the fourth-order filter of the present application; Figure 6 This is a far-band frequency response waveform diagram of the fourth-order filter of the present application; Figure 7 is the fourth-order filter coupling matrix of the present application; Figure 8 It is a schematic diagram of the structure of the fourth-order dielectric waveguide filter of the present application; Fig. 9 It is a schematic diagram of the topological structure of the eighth-order filter of the present application; Fig.10 This is a near-band frequency response waveform diagram of the eighth-order filter of the present application; Fig.11 This is the far-band frequency response waveform of the eighth-order filter of the present application; Fig.12 It is a schematic diagram of the structure of the eighth-order dielectric waveguide filter of the present application; Fig.13 This is a schematic diagram comparing the simulation and synthesis results of the eighth-order dielectric waveguide filter of the present application; Fig.14 This is the S parameter test result of the eighth-order dielectric waveguide filter of this application; Fig.15 It is a structural diagram of a preferred embodiment of the dielectric waveguide filter design system of the present application; Fig.16 This is a structural diagram of a preferred embodiment of the terminal of this application.

[0018] Description of reference numerals: 100. Blind hole introduction module; 200. Admittance parameter analysis module; 300. Coupling matrix solution module; 400. Waveguide design module. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and effect of the present application clearer and more specific, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. The described embodiments are only possible technical implementations of the present application, not all possible implementations. Based on the embodiments in the present application, those skilled in the art can completely combine the embodiments of the present application to obtain other embodiments without creative work, and these embodiments are also within the scope of protection of the present application.

[0020] First, the nouns involved in the embodiments of the present application are introduced: Four-corner element: refers to a filter element with a specific structure, whose structure includes four main resonant units or coupling structures; the four-corner element can be transformed into a five-corner element by introducing a blind hole structure.

[0021] Pentagonal element: refers to an element with five main parts or characteristics formed by adding a new structural element (such as a blind hole) on the basis of a quadrangular element; the introduction of the pentagonal element is to achieve negative coupling and allow additional transmission zeros to be generated in the design of the filter.

[0022] Negative coupling: refers to the coupling effect between two resonant units in a microwave or RF filter, which causes their resonant frequencies to shift, and the direction of the shift is opposite to that of positive coupling; negative coupling is usually achieved through specific structures (such as blind holes) and affects the frequency response and transmission characteristics of the filter.

[0023] Blind hole structure: refers to a hole drilled on a dielectric substrate that does not penetrate the entire substrate. In microwave or RF filters, blind holes can be used as resonators or to achieve specific coupling effects. The blind hole structure is a key element for achieving negative coupling in pentagonal elements and resonates below the passband, thus affecting the performance of the filter.

[0024] Resonance: refers to the resonance phenomenon that occurs in a physical system at a specific frequency. In microwave or RF filters, resonance usually refers to the energy storage and release of a resonant unit (such as a resonator) at a specific frequency. Resonance is the basis of filter design, and the frequency and coupling effect of the resonator jointly determine the frequency response of the filter.

[0025] Resonator: refers to a physical structure that can store and release electromagnetic energy. In microwave or radio frequency filters, resonators are usually the key elements to achieve filtering functions. Resonators can be part of a four-corner element or a five-corner element, and their performance directly affects the overall performance of the filter.

[0026] Filter: A circuit element that allows signals within a specific frequency range to pass while suppressing signals in other frequency ranges; filters are the ultimate goal of the application of terms such as four-corner elements, five-corner elements, resonators and blind hole structures. These elements together determine the frequency response, transmission characteristics and other performance indicators of the filter.

[0027] The following describes the dielectric waveguide filter design method, dielectric waveguide filter, system, terminal and medium of the embodiment of the present application with reference to the accompanying drawings. In view of the problems of negative coupling and cross coupling that may occur when designing dielectric waveguide filters in the above-mentioned related technologies, the present application provides a dielectric waveguide filter design method, in which the use of negative coupling structures is avoided and the occurrence of cross coupling is reduced by treating blind holes as resonators, thereby simplifying the filter design and processing difficulty, and on the basis of the two finite transmission zeros generated by the original four-corner elements, an additional finite transmission zero at an arbitrary position is generated, thereby improving the key indicators of the dielectric waveguide filter such as sideband roll-off and stopband suppression. As a result, the technical problem of negative coupling and cross coupling that may occur when designing dielectric waveguide filters in the related technologies is solved.

[0028] It should be noted that finite transmission zeros can significantly improve the frequency selection characteristics of microwave filters. Using out-of-band reflection zeros for filter synthesis and design can avoid the appearance of negative coupling structures and bring more freedom in filter synthesis and design. This application is aimed at the problems existing in the synthesis and design process of dielectric waveguide filters. In order to solve the problems of negative coupling and cross-coupling that occur in the design of existing dielectric waveguide filters and further improve the frequency selection characteristics of filters, this application uses the blind hole structure in the four-corner element as an out-of-band resonator, and uses the complex reflection zero synthesis method to avoid the appearance of cross-coupling and negative coupling, significantly reducing the difficulty of filter design and processing, and generating an additional transmission zero.

[0029] In the present application, the blind hole structure in the four-corner element is regarded as a resonator resonating below the passband instead of simply as a negative coupling implementation structure to design a dielectric waveguide filter, and the coupling matrix is ​​obtained by the out-of-band complex reflection zero point synthesis method to guide the design of the dielectric waveguide filter. It has the following advantages: First, an additional finite transmission zero point can be generated at any position, which effectively improves the near-band frequency selection characteristics of the filter; second, by adjusting the position of the complex reflection zero point, the sign of all coupling coefficients can be positive and the appearance of cross coupling can be avoided, reducing the difficulty of design and processing and the interference of parasitic coupling on the filter response; third, the resonant frequency of the blind hole below the passband can be flexibly controlled, providing more filter synthesis and design freedom to apply to different practical scenarios. Compared with the traditional dielectric waveguide filter design method, the present application can achieve better sideband roll-off and stopband suppression without increasing the filter size. A fourth-order three-transmission zero dielectric waveguide filter and an eighth-order six-transmission zero dielectric waveguide filter design example are given to prove the effectiveness of the design method proposed by the present invention.

[0030] The technical solution of the present application is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0031] The dielectric waveguide filter design method described in the preferred embodiment of the present application is as follows: Figure 1 As shown, the dielectric waveguide filter design method comprises the following steps: In step S101, a blind hole structure is introduced into a four-corner element filter to form a five-corner element filter, wherein the blind hole structure is used to generate an additional transmission zero point.

[0032] Specifically, Figure 2 As shown, in the classic four-corner element, the blind hole structure of negative coupling is regarded as a resonator with resonance below the passband, Figure 2 In this case, S represents the source and L represents the load. At this time, the four-corner element is transformed into Figure 3 The pentagonal element shown.

[0033] It is understandable that in the classic four-corner element filter design, negative coupling structures are usually not included. However, in order to generate additional transmission zeros (these zeros can be anywhere outside the passband of the filter to improve the performance of the filter, such as improving out-of-band suppression), negative coupling needs to be introduced. The present application achieves this negative coupling by treating the blind hole structure as a resonator that resonates below the passband. A four-corner element refers to a filter structure with four resonators (or equivalent circuit elements). When the blind hole structure is introduced, the structure can be regarded as an additional resonator due to its special electromagnetic properties, thereby transforming the original four-corner element filter into a five-corner element filter.

[0034] The present application realizes negative coupling in the filter by introducing a blind hole structure (used as an additional resonator, which resonates below the passband). Negative coupling is the key to generating additional transmission zeros, which can improve the out-of-band suppression performance of the filter. The transition from four-corner elements to five-corner elements provides more design freedom, so that the performance of the filter can be optimized by adjusting the position and parameters of the blind hole structure.

[0035] In step S102, an admittance parameter analysis is performed on the pentagonal element filter to obtain parameter information of the pentagonal element filter.

[0036] In a possible implementation, the pentagonal element filter includes a first structure and a second structure. An expression of an admittance parameter of the first structure and an expression of an admittance parameter of the second structure are established; the residues and poles corresponding to the two expressions are determined, wherein the residues of the two expressions satisfy a preset relationship; and parameter information of the pentagonal element filter is extracted according to the residues and poles corresponding to the two expressions.

[0037] Specifically, first divide the components, divide the pentagonal element filter into two parts, each part has its corresponding admittance parameter, which helps to analyze the characteristics of the filter more clearly; establish the admittance parameter expression, for each part, establish the mathematical expression of the admittance parameter according to its circuit structure and component characteristics; determine the residue and pole, in the expression of the admittance parameter, the residue reflects the response strength of the filter at a specific frequency, and the pole determines the frequency response characteristics of the filter. Through analysis and calculation, the specific values ​​of these parameters can be determined; meet specific conditions, in order to ensure that the filter has the required performance, in the absence of cross-coupling and all coupling coefficients are positive, specific residues and relationships need to be met; extract basic parameters, after determining the residue and poles, extract the basic parameters of the filter, such as the transmission zero position, the complex reflection zero position, the return loss and the order, etc. These parameters will be used for subsequent polynomial construction and coupling matrix acquisition.

[0038] Furthermore, the admittance parameters of the pentagonal element are analyzed and the pentagonal element is divided into Figure 4 The two parts are shown. The admittance parameters of the first structure are: ; in, is the admittance parameter of the first structure, j is an imaginary unit, r 0 is a constant, is a complex frequency variable, λ 1 and λ 2 represents the pole of the first structure, r 1 and r 2 respectively correspond to λ 1 and λ The remainder of 2.

[0039] The admittance parameters of the second structure are: ; in, is the admittance parameter of the second structure, λ 3 represents the pole of the second structure, r 3 corresponds to λ The remainder of 3.

[0040] If you want to satisfy Figure 3 In order to ensure that there is no cross-coupling and all coupling coefficients are positive, the following conditions must be met (preset relations): , ; The above conditions can be met by adjusting the complex reflection zero point position, see step 103 .

[0041] In step S103, a polynomial is constructed according to the parameter information, and a coupling matrix is ​​obtained according to the polynomial.

[0042] In a possible implementation, the parameter information includes a transmission zero point position and a complex reflection zero point position, and the polynomial includes a first polynomial, a second polynomial, and a third polynomial. The first polynomial is constructed according to the transmission zero point position, and the second polynomial is constructed according to the complex reflection zero point position; the third polynomial is obtained according to the first polynomial and the second polynomial.

[0043] In one possible implementation, an admittance matrix is ​​constructed according to the first polynomial, the second polynomial and the third polynomial; the admittance matrix is ​​expanded into a fractional form related to each node of the filter and the source and load; a coupling coefficient is obtained according to the fractional form, and a coupling matrix is ​​obtained according to the coupling coefficient.

[0044] In a possible implementation, scattering parameters are obtained according to the first polynomial and the second polynomial, and then the coupling matrix is ​​integrated under the condition that the second polynomial and the third polynomial are known, and the admittance matrix is ​​constructed according to the scattering parameters.

[0045] Specifically, first, the polynomial is constructed according to the basic parameters of the filter (such as the transmission zero point position, the complex reflection zero point position, the return loss RL and the order). The first polynomial Determined by the location of the finite transmission zero, the second polynomial It is composed of complex reflection zero points and pure imaginary reflection zero points, divided into , Two parts; expression of scattering parameters, using polynomials to represent the reflection function of a two-port network and transfer function , and Given as a division of polynomials, where the denominator is the third polynomial It is obtained according to the energy conservation formula. The polynomial expression here is to facilitate the synthesis of the coupling matrix later. The synthesis of the coupling matrix, given the known polynomial , Under the condition of and (Note that s =jΩ) to construct the admittance matrix , the admittance matrix The expression of varies according to the parity of the filter order. Expanded into partial fraction form, in order to establish a connection with the coupling matrix, by comparing the two different representation methods of the admittance matrix, the coupling coefficient of the source and the load can be obtained , and the coupling coefficients between the source and load and the node and By changing the position of the complex reflection zero, the polynomial , and Will change, the change of these polynomials will further affect the size of the admittance parameters and the coupling matrix value, and the position of the complex reflection zero point can be determined by a global optimization method to meet the residue condition in step S102.

[0046] That is to say, the present application expresses the scattering parameters by constructing a polynomial, and then synthesizes the coupling matrix. In this process, the position of the complex reflection zero point plays a crucial role, because it directly affects the form of the polynomial and the value of the coupling matrix. By determining the position of the complex reflection zero point through a global optimization algorithm, the dielectric waveguide filter finally designed can meet specific performance requirements.

[0047] Further, after specifying the basic parameters of the filter, such as the transmission zero position, complex reflection zero position, return loss RL and order. The corresponding polynomial can be obtained: ; ; in, is the first polynomial, Ω is the normalized angular frequency, the first polynomial P (Ω) by the finite transmission zero Ω TZ，i The location determines is the second polynomial, the polynomial F (Ω) can be divided into two parts, namely the complex reflection zero point Ω CRZ，k constituted F 2(Ω) and pure imaginary reflection zero Ω RZ，j constituted F 1(Ω). M , N , Nc They represent the number of finite transmission zeros, the number of pure imaginary reflection zeros and the number of complex reflection zeros respectively.

[0048] For an arbitrary two-port network, its reflection function is S 11 and transfer function S 21 It can be expressed as a polynomial division: ; in, , The return loss RL Related constants.

[0049] The third polynomial E (Ω) can be obtained according to the energy conservation formula: ; Since the analysis is about passive network, the polynomial E The roots of (Ω) should all be in the left half of the complex plane, and the remaining roots should be discarded. When the number of finite transmission zeros is less than the filter order, ε R=1; when the number of finite transmission zeros is equal to the filter order, . ε is a constant defined as: ; Then, given the above polynomials, coupling matrix synthesis can be performed. F (Ω), E (Ω), the following describes how to use polynomials to obtain the filter coupling matrix. and Constructing the admittance matrix ,in s =jΩ.

[0050] When the filter order is even: ; When the filter order is an odd number: ; where the polynomials m and n are defined as: ; ; , Polynomial , The coefficient of , , They are P (Ω), F (Ω), E (Ω) corresponds to s Field of polynomials.

[0051] Expand the above formula into partial fraction form (i.e., the fraction form related to each node of the filter and the source and load, and the constant term is not expanded), and the fraction form is expressed as: ; in, represents the admittance matrix, , , and They represent the admittance parameters of the two-port network, is an imaginary unit, K Represents the coupling coefficient from source to load. When the number of transmission zeros is less than the filter order, is zero, when the number of transmission zeros is equal to the filter order, . represents the number of pure imaginary reflection zeros,k is the filter node index, represents a complex frequency variable, represents the eigenvalue of the filter node, , , and They represent the residues corresponding to the corresponding nodes.

[0052] Figure 5 is the lateral topology of the filter, and each resonator is directly coupled to the source and the load. The admittance matrix corresponding to this topology is:

[0053] In the formula , represents the coupling coefficient between source and load, represents the coupling coefficient between the source and the node, Represents the coupling coefficient between the load and the node.

[0054] according to Y The above two different representation methods can be obtained:

[0055] when When and : ; and are constants related to the frequency response of the filter nodes, respectively.

[0056] for Figure 4 The topology shown in Figure 1 has a conductance parameter of Y 1 and Y The sum of 2 is the admittance parameter of the corresponding lateral topological structure Y 12 ( s ). It can be seen that by changing the position of the complex reflection zero point, the polynomial P , F and E will change, which in turn affects the size of the admittance parameter and the coupling matrix value. Therefore, the position of the complex reflection zero point can be determined by a global optimization method to meet the residue condition in step 102.

[0057] In step S104, a target design of the dielectric waveguide filter is obtained according to the coupling matrix, so as to obtain a corresponding dielectric waveguide filter according to the target design.

[0058] In a possible implementation, the blind hole structure is used as a resonator resonating below the passband; the target design includes the position and size of each resonator in the filter. The position and size of each resonator in the dielectric waveguide filter are determined according to the coupling matrix.

[0059] Specifically, a dielectric waveguide filter is designed according to a coupling matrix, wherein a resonant mode resonating below a passband is realized by a blind hole structure.

[0060] The dielectric waveguide filter design method of the present application has the following advantages: First, this application proposes for the first time to regard the blind hole structure as a resonator that resonates below the passband. Through the complex reflection zero point synthesis method, the negative coupling coefficient and cross-coupling coefficient can be avoided, and the influence of parasitic coupling on the response of the dielectric waveguide filter can be reduced. Simplify the filter design and processing difficulty. Second, this application can generate an additional finite transmission zero point at any position on the basis of the two finite transmission zero points generated by the original four-corner elements, which greatly improves the key filter indicators such as sideband roll-off and stopband suppression of the dielectric waveguide filter. Third, this application can flexibly select the position of the complex reflection zero point and thereby control the size of the coefficients in the coupling matrix, which increases the degree of freedom in filter synthesis and design and expands the practical application scope of this method.

[0061] The dielectric waveguide filter design method of the present application is further described below through specific embodiments.

[0062] Embodiment 1: This embodiment is a dielectric waveguide filter of fourth order in-band with three finite transmission zeros and one out-of-band complex reflection zero. The finite transmission zeros are located at -1.5j, -3j, and 2.5j, respectively. Figure 2 The figure shows a conventional four-corner element topology, in which the coupling coefficient between resonator 1 and resonator 4 is negative, which needs to be realized by using a blind hole structure. Figure 2 The four corner elements in are converted into Figure 3 The pentagonal element shown in FIG. 4 , in which the resonator 4 is realized by a blind hole structure and resonates below the passband. Then, Figure 3 The pentagonal element in step 102 is used for the admittance parameter analysis. Under the condition of a given complex reflection zero imaginary part, a suitable complex reflection zero real part is selected so that all coupling coefficients are positive and there is no cross coupling between resonator 1 and resonator 5. The simplified pentagonal element topology is as follows: Figure 4 In this example, the imaginary parts of the complex reflection zero points are set to -10j, -8.75j, and -5.75j respectively; the corresponding real parts of the complex reflection zero points can be obtained by analyzing the admittance parameters, which are -1.7285, -1.759, and -0.5300 respectively. Figure 5 The near-band frequency response under three different out-of-band complex reflection zero conditions is shown, comparing the four S 21 The following conclusions can be drawn from the parameters (three different complex reflection zero points and one traditional method): Compared with the traditional four-corner element, the design method proposed in this paper can achieve better sideband roll-off characteristics and stopband suppression characteristics without increasing the size. Figure 6 The far-band frequency response under four different conditions is shown. Due to the existence of out-of-band resonant modes, the S 21 The parameters have a certain degree of decay in the far-end suppression below the passband. Figure 7 Shown is the corresponding coupling matrix when the complex reflection zero point is -0.5300-5.75j.

[0063] Figure 8 The figure shows a schematic diagram of the structural model of a fourth-order dielectric waveguide filter, which includes a feeding port 1, a feeding port 7, a resonator 2 resonating within the passband, a resonator 3, a resonator 5, a resonator 6, and a resonator 4 resonating below the passband (realized by a blind hole structure).

[0064] This example introduces an additional transmission zero point without increasing the size of the dielectric waveguide filter and avoids the occurrence of negative coupling and cross coupling, which reduces the design difficulty and processing cost, and greatly improves the rectangular coefficient and other key indicators of the dielectric waveguide filter. In addition, the position of the out-of-band complex reflection zero point can also be arbitrarily adjusted, providing more filter synthesis and design freedom, and can solve the optimal comprehensive solution in different scenarios.

[0065] Embodiment 2: This embodiment is an in-band eighth-order dielectric waveguide filter with six finite transmission zeros and two out-of-band complex reflection zeros. The positions of the finite transmission zeros are -2.4j, 1.1j, -3.5j, -1.1j, 2j, and -1.4j, respectively. The topological structure is as follows: Fig. 9 As shown, the resonance of resonator 4 and resonator 9 are both realized by blind hole structures, and the resonance is below the passband. The imaginary coefficients of the out-of-band complex reflection zero point are set to -7.7339j and -2.4476j respectively. By applying the same admittance parameter analysis method to the topology as the fourth-order filter above, the real coefficients of the two out-of-band complex reflection zero points can be solved, which are 0.3884 and -0.7047 respectively.

[0066] Fig.10 The figure shows the near-band frequency response of the eighth-order dielectric waveguide filter. Compared with the eighth-order four-zero dielectric waveguide filter based on the traditional design method, it can be seen that the frequency selectivity in the near-band is significantly improved due to the increase in the number of transmission zeros. Fig.11As shown, at the far end of the passband, due to the existence of the complex reflection zero point, the stopband suppression has a slight decline, but it can still be maintained below 60dB and will not affect the performance of the filter.

[0067] The schematic diagram of the structural model of the eighth-order dielectric waveguide filter is as follows Fig.12 As shown in the figure, ports 1 and 12 are feeding ports, ports 2, 3, 4, 7, 8, 9 and 11 are resonators resonating in the band, and ports 5 and 10 are resonators resonating outside the band, which are realized by blind hole structures. The simulation results in HFSS (High Frequency Structural Simulator, high frequency structure simulation software) are shown in the figure. Fig.13 As shown in Figure 1, due to the high filter order in this example, the redundant resonant modes outside the band are suppressed. Fig.13 In the frequency response shown, no significant degradation of suppression below the passband is observed, further improving the performance of this method in designing high-order dielectric waveguide filters. Fig.14 The final S-parameter test results verify the effectiveness of the proposed cutoff waveguide filter design method.

[0068] Compared with the traditional dielectric waveguide filter design method, this embodiment can realize additional transmission zeros, greatly improve the filter frequency selection characteristics, and the redundant resonance mode below the passband can be effectively suppressed when designing a high-order dielectric waveguide filter. This embodiment fully demonstrates the application of the proposed design method in the design of high-order dielectric waveguide filters, and demonstrates a cascade method of multiple four-corner elements with out-of-band resonance modes, effectively expanding the application scope of the proposed design method.

[0069] Based on the above embodiments, the present application also provides a dielectric waveguide filter, wherein the dielectric waveguide filter is designed according to the dielectric waveguide filter design method as described in any one of the above schemes.

[0070] Specifically, the fourth-order dielectric waveguide filter and the eighth-order dielectric waveguide filter are obtained as designed above.

[0071] Next, a dielectric waveguide filter design system proposed according to an embodiment of the present application is described with reference to the accompanying drawings.

[0072] Fig.15 It is a structural diagram of a dielectric waveguide filter design system according to an embodiment of the present application.

[0073] like Fig.15 As shown, the dielectric waveguide filter design system includes: a blind hole introduction module 100, an admittance parameter analysis module 200, a coupling matrix solution module 300 and a waveguide design module 400.

[0074] Specifically, the blind hole introduction module 100 is used to introduce a blind hole structure into a four-corner element filter to form a five-corner element filter, wherein the blind hole structure is used to generate an additional transmission zero point; An admittance parameter analysis module 200 is used to perform an admittance parameter analysis on the pentagonal element filter to obtain parameter information of the pentagonal element filter; A coupling matrix solving module 300, used to construct a polynomial according to the parameter information, and obtain a coupling matrix according to the polynomial; The waveguide design module 400 is used to obtain a target design according to the coupling matrix, and obtain a dielectric waveguide filter according to the target design.

[0075] Fig.16 This is a structural diagram of a terminal provided in an embodiment of the present application. The terminal may include: A memory 501 , a processor 502 , and a computer program stored in the memory 501 and executable on the processor 502 .

[0076] When the processor 502 executes the program, the dielectric waveguide filter design method provided in the above embodiment is implemented.

[0077] Furthermore, the terminal further includes: The communication interface 503 is used for communication between the memory 501 and the processor 502 .

[0078] The memory 501 is used to store computer programs that can be executed on the processor 502 .

[0079] The memory 501 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0080] If the memory 501, the processor 502 and the communication interface 503 are implemented independently, the communication interface 503, the memory 501 and the processor 502 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus or an Extended Industry Standard Architecture (EIS) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.16 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0081] Optionally, in a specific implementation, if the memory 501, the processor 502 and the communication interface 503 are integrated on a chip, the memory 501, the processor 502 and the communication interface 503 can communicate with each other through an internal interface.

[0082] The processor 502 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0083] This embodiment also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the above dielectric waveguide filter design method is implemented.

[0084] One embodiment of the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the present application Figure 1 A dielectric waveguide filter design method provided by any embodiment in the corresponding embodiment.

[0085] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0086] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0087] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0088] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable storage medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, a "computer-readable storage medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples (non-exhaustive list) of computer-readable storage media include the following: an electrical connection with one or N wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable storage medium may even be paper or other suitable medium on which the program is printed, since the program can be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways as necessary, and then storing it in a computer memory.

[0089] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0090] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0091] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0092] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

[0093] It should be understood that the application of the present application is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to this application.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A dielectric waveguide filter design method, characterized in that: The dielectric waveguide filter design method comprises: Introducing a blind hole structure into a four-corner element filter to form a five-corner element filter, wherein the blind hole structure is used to generate an additional transmission zero point; Performing admittance parameter analysis on the pentagonal element filter to obtain parameter information of the pentagonal element filter; constructing a polynomial according to the parameter information, and obtaining a coupling matrix according to the polynomial; A target design is obtained according to the coupling matrix, and a dielectric waveguide filter is obtained according to the target design.

2. The dielectric waveguide filter design method according to claim 1, characterized in that: The pentagonal element filter includes a first structure and a second structure; The step of performing admittance parameter analysis on the pentagonal element filter to obtain parameter information of the pentagonal element filter specifically includes: Establishing an expression for an admittance parameter of the first structure and an expression for an admittance parameter of the second structure; Determine the residues and the extreme points corresponding to the two expressions, respectively, wherein the residues of the two expressions satisfy a preset relationship; Parameter information of the pentagonal element filter is extracted based on the residues and poles corresponding to the two expressions.

3. The dielectric waveguide filter design method according to claim 2, characterized in that: The expression of the admittance parameter of the first structure is: ； The expression of the admittance parameter of the second structure is: ； The preset relationship is: ， ， ； in, is the admittance parameter of the first structure, is an imaginary unit, is a constant, is a complex frequency variable, and represents the poles of the first structure, and Corresponding to and The residue of is the admittance parameter of the second structure, represents the poles of the second structure, For the corresponding The remainder of .

4. The dielectric waveguide filter design method according to claim 1, characterized in that: The parameter information includes a transmission zero point position and a complex reflection zero point position, and the polynomial includes a first polynomial, a second polynomial and a third polynomial; The constructing of a polynomial according to the parameter information specifically includes: constructing a first polynomial according to the transmission zero point position, and constructing a second polynomial according to the complex reflection zero point position; A third polynomial is obtained according to the first polynomial and the second polynomial.

5. The dielectric waveguide filter design method according to claim 4, characterized in that: The obtaining of the coupling matrix according to the polynomial specifically includes: constructing an admittance matrix according to the first polynomial, the second polynomial and the third polynomial; Expanding the admittance matrix into a fractional form associated with each node of the filter and the source and load; A coupling coefficient is obtained according to the fractional form, and a coupling matrix is ​​obtained according to the coupling coefficient.

6. The dielectric waveguide filter design method according to claim 1, characterized in that: The blind hole structure acts as a resonator that resonates below the passband; The target design includes the location and size of each resonator; The step of obtaining a target design according to the coupling matrix and obtaining a dielectric waveguide filter according to the target design is specifically as follows: The position and size of each resonator are determined according to the coupling matrix, and a dielectric waveguide filter is designed according to the position and size of each resonator.

7. A dielectric waveguide filter, characterized in that: The dielectric waveguide filter is designed according to the dielectric waveguide filter design method according to any one of claims 1 to 6.

8. A dielectric waveguide filter design system, characterized in that: The dielectric waveguide filter design system is applied to the dielectric waveguide filter design method according to any one of claims 1 to 6, and the dielectric waveguide filter design system comprises: A blind hole introduction module, used for introducing a blind hole structure into a four-corner element filter to form a five-corner element filter, wherein the blind hole structure is used to generate an additional transmission zero point; An admittance parameter analysis module, used for performing admittance parameter analysis on the pentagonal element filter to obtain parameter information of the pentagonal element filter; A coupling matrix solving module, used for constructing a polynomial according to the parameter information, and obtaining a coupling matrix according to the polynomial; The waveguide design module is used to obtain a target design according to the coupling matrix, and obtain a dielectric waveguide filter according to the target design.

9. A terminal, characterized in that: The terminal comprises: a memory, a processor, and a dielectric waveguide filter design program stored in the memory and executable on the processor, wherein the dielectric waveguide filter design program implements the steps of the dielectric waveguide filter design method according to any one of claims 1 to 6 when executed by the processor.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a dielectric waveguide filter design program, and when the dielectric waveguide filter design program is executed by a processor, the steps of the dielectric waveguide filter design method according to any one of claims 1 to 6 are implemented.

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