Dielectric waveguide filter, construction method and dielectric waveguide duplexer

Abstract

The invention provides a dielectric waveguide filter, a construction method and a dielectric waveguide duplexer. The construction method of the dielectric waveguide filter comprises the following steps: selecting a dielectric material based on a given target passband index; establishing a matrix four-mode dielectric waveguide resonator, and adjusting the size of a rectangular dielectric waveguide to enable the resonant mode frequency to reach a target frequency band; carrying out electromagnetic field distribution analysis on a single four-mode dielectric waveguide resonator with a set size, positioning the distribution position of a resonance mode according to the distribution condition of an electromagnetic field, and respectively embedding four blind holes in the position where the electromagnetic field is strongest in distribution so as to realize polarization fixation and frequency regulation and control on the resonance mode; selecting a coupling topology to construct a dielectric filter based on frequency regulation and control of the four-mode dielectric waveguide resonator; the additional coupling blind holes are added on the basis of the coupling topological structure so as to regulate and control the mutual coupling between the adjacent resonators. According to the technical scheme, the problem that the size of a filter in the prior art is large is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filter, in particular to a dielectric waveguide filter, a construction method and a dielectric waveguide duplexer. BACKGROUND

[0002] With the evolution of mobile communication technology from 4G / LTE to 5G / 5G-Advanced and the foresight of moving towards 6G, the spectrum efficiency and system capacity requirements of wireless networks are showing explosive growth. In order to cope with the wide application of core technologies such as massive data throughput of higher frequency bands (such as millimeter waves and even terahertz), denser network deployment (ultra-dense networking, UDN) and massive multiple-input multiple-output (Massive Multiple-Input Multiple-Output, MIMO), base stations have made unprecedentedly stringent requirements on radio frequency front-end filters: devices must meet extreme selectivity, low insertion loss, high suppression performance, while achieving miniaturization of volume, significant weight reduction and revolutionary improvement of temperature stability.

[0003] Traditionally, the field of base station radio frequency filters has long been dominated by metal cavity filters, including single-mode metal cavity filters and dielectric-loaded cavity filters. The former uses precisely machined metal cavity resonant units to adjust the frequency by adjusting the physical size of the cavity; the latter fills the metal cavity with high dielectric constant ceramic media, aiming to reduce the volume. However, these traditional structures have significant inherent limitations:

[0004] That is, the volume and weight bottleneck: whether it is a pure metal cavity or a dielectric-loaded cavity, the resonant unit size is usually positively correlated with the operating wavelength (especially in the Sub-6 GHz frequency band). The three-dimensional size of a single filter is usually large, and the weight is considerable. This forms a serious space limitation in the limited space of the base station (especially for Massive MIMO active antenna units, AAU / AAS, which need to integrate tens or even hundreds of filter channels to realize beamforming), greatly restricting the number of filters that can be integrated on a single substrate, limiting system capacity and beam flexibility. SUMMARY

[0005] The main purpose of the present application is to provide a dielectric waveguide filter, a construction method and a dielectric waveguide duplexer, to solve the problem of large size of the filter in the related art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a method for constructing a dielectric waveguide filter is provided, comprising: selecting a dielectric material based on a given target passband index; establishing a matrix four-mode dielectric waveguide resonator, adjusting the size of the rectangular dielectric waveguide to make the resonant mode frequency reach the target frequency band; performing electromagnetic field distribution analysis on the single four-mode dielectric waveguide resonator with the set size, positioning the resonant mode distribution position according to the distribution of the electromagnetic field, and embedding four blind holes at the positions with the strongest electromagnetic field distribution to achieve polarization fixation and frequency regulation of the resonant mode; selecting a coupling topology to construct the dielectric filter based on the frequency regulation of the four-mode dielectric waveguide resonator; adding additional coupling blind holes based on the coupling topology structure to achieve regulation of the mutual coupling between adjacent resonators, and optimizing the parameters of the dielectric waveguide filter through simulation.

[0007] Further, the four resonant modes are two pairs of odd and even modes, the first resonant mode and the second resonant mode in the first plane are both transverse magnetic modes, and the third resonant mode in the second plane and the fourth resonant mode in the third plane are both transverse electric modes.

[0008] Further, based on the given target passband index, a dielectric material with a dielectric constant is selected; the step of establishing a matrix four-mode dielectric waveguide resonator and adjusting the size of the rectangular dielectric waveguide to make the resonant mode frequency reach the target frequency band comprises:

[0009] Selecting a target dielectric material based on volume, Q value and dielectric constant;

[0010] Adjusting the size of the dielectric block of the target dielectric material to regulate the frequency range.

[0011] Further, the step of performing electromagnetic field distribution analysis on the single four-mode dielectric waveguide resonator with the set size and positioning the resonant mode distribution position according to the distribution of the electromagnetic field comprises:

[0012] For the resonant mode of the first plane, two first resonant blind holes and second resonant blind holes symmetric about the center are embedded to construct a first resonant mode and a second resonant mode, and two second resonant blind holes and third resonant blind holes symmetric about the center are embedded on the second plane and the third plane respectively to construct a third resonant mode and a fourth resonant mode;

[0013] The adjacent planes of the dielectric block are set as a first plane, a second plane and a third plane, a first resonant blind hole and a second resonant blind hole are arranged on the first plane, a pair of third resonant blind holes are arranged on the second plane, and a fourth resonant blind hole is arranged on the third plane; wherein the first resonant blind hole and the second resonant blind hole are arranged on the horizontal center symmetry line of the first plane, the third resonant blind hole is arranged on the horizontal center symmetry line of the second plane, and the fourth resonant blind hole is arranged on the horizontal center symmetry line of the third plane;

[0014] The resonant frequency of the first resonant mode is adjusted by the first resonant blind hole, the resonant frequency of the second resonant mode is adjusted by the second resonant blind hole, the resonant frequency of the third resonant mode is adjusted by the third resonant blind hole, and the resonant frequency of the fourth resonant mode is adjusted by the fourth resonant blind hole.

[0015] Further, the first resonant blind hole and the second resonant blind hole have the same aperture, and the first resonant blind hole, the second resonant blind hole, the third resonant blind hole, and the fourth resonant blind hole have different depths.

[0016] Further, the depth of the first resonant blind hole is less than the depth of the second resonant blind hole, and the depth of the third resonant blind hole is greater than the depth of the fourth resonant blind hole.

[0017] According to a second aspect of the present application, a dielectric waveguide filter is provided, which is constructed by the above-mentioned construction method. The dielectric waveguide filter comprises a four-mode dielectric waveguide resonator having adjacent first, second, and third planes. The first resonant blind hole and the second resonant blind hole are arranged on the horizontal center symmetry line of the first plane, the third resonant blind hole is arranged on the horizontal center symmetry line of the second plane, and the fourth resonant blind hole is arranged on the horizontal center symmetry line of the third plane. The four-mode dielectric waveguide resonator is provided with a first input end and a first output end.

[0018] Further, the four-mode dielectric waveguide resonator is provided with a coupling through slot, which is located at the center of the four-mode dielectric waveguide resonator and is used to control the coupling between the first resonant blind hole, the second resonant blind hole, the third resonant blind hole, and the fourth resonant blind hole.

[0019] Further, the four-mode dielectric waveguide resonator is further provided with a first coupling blind hole, a second coupling blind hole, a third coupling blind hole, and a fourth coupling blind hole. The first coupling blind hole, the second coupling blind hole, and the fourth coupling blind hole are arranged on the fourth plane of the dielectric block, and the fourth plane is arranged opposite to the first plane. The third coupling blind hole is arranged on the first plane and is used to form a virtual negative coupling.

[0020] Further, the first coupling blind hole is arranged adjacent to the first resonant blind hole and between the first resonant blind hole and the fourth resonant blind hole; the second coupling blind hole is arranged adjacent to the second resonant blind hole and between the second resonant blind hole and the fourth resonant blind hole; the third coupling blind hole is arranged adjacent to the second resonant blind hole and between the second resonant blind hole and the third resonant blind hole; the fourth coupling blind hole is arranged adjacent to the first resonant blind hole and between the first resonant blind hole and the third resonant blind hole; the center of the first coupling blind hole and the center of the second coupling blind hole are located on the same plane.

[0021] Further, the first coupling blind hole, the second coupling blind hole, the third coupling blind hole and the fourth coupling blind hole have the same aperture, and the first coupling blind hole, the second coupling blind hole, the third coupling blind hole and the fourth coupling blind hole have different depths.

[0022] According to a third aspect of the present application, a dielectric waveguide diplexer is provided, comprising a second input end, a second output end and a third output end; a first dielectric waveguide filter arranged between the second input end and the second output end; a second dielectric waveguide filter arranged between the second input end and the third output end; a feeding blind hole, which is coupled to a four-mode dielectric resonator in the first dielectric waveguide filter and simultaneously coupled to a four-mode dielectric waveguide resonator in the second dielectric waveguide filter; the first input end is arranged below the feeding blind hole, the second output end is arranged on the four-mode dielectric resonator of the first dielectric waveguide, and the third output end is arranged on the four-mode dielectric waveguide resonator in the second dielectric waveguide filter; wherein the first dielectric waveguide filter is the dielectric waveguide filter described above, and the second dielectric waveguide filter is the dielectric waveguide filter described above.

[0023] The application selects a dielectric material with a suitable dielectric constant based on the given target passband index, and then uses an electromagnetic simulation software to establish a matrix dielectric waveguide resonator, and adjusts the size of the rectangular dielectric waveguide to make the resonant mode frequency reach the vicinity of the target frequency band. The electromagnetic field distribution of the single dielectric waveguide resonator with the set size is analyzed, the resonant mode distribution position is located according to the electromagnetic field distribution, and four blind holes are embedded in the position with strong electromagnetic field distribution respectively to realize the polarization fixing and frequency regulation of the resonant mode. On the basis of the above, the depth of the blind hole is adjusted to make the resonant frequencies of the four resonant modes reach the vicinity of the target frequency. Based on the frequency regulation of the resonator, a suitable coupling topology is selected to construct a dielectric filter. In order to improve the passband selectivity of the filter, a topology structure with a transmission zero point is selected to enhance the passband selectivity and suppress the out-of-band spurious mode, and additional coupling blind holes are added based on the coupling topology structure to realize accurate regulation of the mutual coupling between adjacent resonators. Simulation is performed by using the simulation software, and the parameters of the four-mode filter are optimized, so that the return loss, insertion loss, transmission zero point and other indicators of the filter meet the requirements of the base station filter. The dielectric constant and size of the dielectric material are accurately controlled in the embodiment, which ensures that the frequency of the resonant mode can accurately fall in the target frequency band, and the resonant mode is effectively regulated by embedding the blind hole. The localization effect of the dielectric material on the electromagnetic wave and the influence of the multiple blind holes on the electromagnetic field distribution are utilized to realize accurate control of the resonant mode. In this way, the selectivity and frequency stability of the filter are effectively improved, the volume and weight are reduced, and the miniaturization and light weight of the filter are realized. Therefore, the technical solution of the application effectively solves the problem of large size of the filter in the related art. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application and explanations thereof, make an explanation of the application complete, and do not constitute an improper limitation of the application. In the drawings:

[0025] Figure 1 A flow chart of an embodiment of the construction method of the dielectric waveguide filter according to the application is shown;

[0026] Figure 2 A detailed flow chart of step S10 of the construction method of Figure 1 is shown;

[0027] Figure 3 A detailed flow chart of step S20 of the construction method of Figure 1 is shown;

[0028] Figure 4 A perspective structural schematic diagram of a four-mode dielectric waveguide resonator of the dielectric waveguide filter according to the application is shown;

[0029] Figure 5 a top perspective view of a four-mode dielectric waveguide resonator of Figure 4

[0030] Figure 6 a side perspective view of a four-mode dielectric waveguide resonator of Figure 4

[0031] Figure 7 a perspective structural schematic of a dielectric waveguide filter of Figure 4

[0032] Figure 8 a top perspective view of a dielectric waveguide filter of Figure 7

[0033] Figure 9 a side perspective view of a dielectric waveguide filter of Figure 7

[0034] Figure 10 a scattering parameter plot of a dielectric waveguide filter of Figure 7

[0035] Figure 11 a perspective structural schematic of a dielectric waveguide diplexer according to the present application;

[0036] Figure 12 a top perspective view of a dielectric waveguide diplexer of Figure 7

[0037] Figure 13 a side perspective view of a dielectric waveguide diplexer of Figure 7

[0038] Figure 14 a scattering parameter plot of a dielectric waveguide diplexer of Figure 7

[0039] wherein the above figures include the following reference signs:

[0040] 110, first resonant via; 120, second resonant via; 130, third resonant via; 140, fourth resonant via; 210, first coupling via; 220, second coupling via; 230, third coupling via; 240, fourth coupling via; 310, first input; 320, first output; 330, second input; 340, second output; 350, third output. DETAILED DESCRIPTION

[0041] ​​​​​​​​​Clearly, the embodiments described are only some embodiments of the application and not all embodiments of the application. The descriptions of the at least one example embodiment are intended to be illustrative, and not to limit the scope of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of the application.

[0042] It should be noted that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0043] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the application unless otherwise specifically stated. It is to be understood that the drawings are not necessarily to scale as the dimensions of the parts shown are for the clarity of presentation and are shown exaggerated in relation to each other. The techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail but should be considered as if the discussion were in place. In the examples shown and discussed herein, any specific values should be interpreted as illustrative only and not as a limitation. Other examples of the example embodiments can have different values. It is noted that like numbers and letters on the figures identify like parts throughout the disclosure, and thus, once an item is defined in one figure, it is not necessary to discuss it further in connection with other figures.

[0044] Traditional base station filters are mainly based on single-mode metal cavities or dielectric-loaded cavity structures, which often lead to large filter volume and high weight. This not only limits the number of filters that can be integrated within a single base station, but also hinders the large-scale application and development of multiple-input multiple-output (MIMO) antenna technology. In addition, metal cavity filters also face the challenge of poor temperature stability - changes in environmental temperature can significantly degrade their performance indicators, thereby affecting the reliable reception and transmission of signals.

[0045] To solve the above technical problems, as shown in the present embodiment, the construction method of the dielectric waveguide filter comprises: Figure 1 The construction method of the dielectric waveguide filter comprises:

[0046] Step S10: based on the given target passband index, select a dielectric material; establish a matrix four-mode dielectric waveguide resonator, adjust the size of the rectangular dielectric waveguide to make the resonant mode frequency reach the target frequency band;

[0047] Step S20: analyze the electromagnetic field distribution of the single four-mode dielectric waveguide resonator with the set size, locate the resonant mode distribution position according to the electromagnetic field distribution, and embed four blind holes in the position with the strongest electromagnetic field distribution to realize the polarization fixing and frequency regulation of the resonant mode;

[0048] Step S30: based on the frequency regulation of the four-mode dielectric waveguide resonator, select a coupling topology to construct a dielectric filter; add additional coupling blind holes based on the coupling topology structure to realize the regulation of the mutual coupling between adjacent resonators and optimize the parameters of the dielectric waveguide filter through simulation.

[0049] The technical scheme of the embodiment is applied, based on the given target passband index, a dielectric material with suitable dielectric constant is selected, and then a matrix dielectric waveguide resonator is established by using professional electromagnetic simulation software, and the size of the rectangular dielectric waveguide is adjusted to make the resonant mode frequency reach the target frequency band. The electromagnetic field distribution of the single dielectric waveguide resonator with the set size is analyzed, the resonant mode distribution position is located according to the electromagnetic field distribution, and four blind holes are respectively embedded in the positions with relatively strong electromagnetic field distribution to realize the polarization fixing and frequency regulation of the resonant mode. On the basis of the above, the depth of the blind holes is adjusted to make the resonant frequencies of the four resonant modes reach the target frequency band. Based on the frequency regulation of the resonator, a suitable coupling topology is selected to construct a dielectric filter. In order to improve the passband selectivity of the filter, a topology structure with a transmission zero point is selected to enhance the passband selectivity and suppress the out-of-band spurious mode, and additional coupling blind holes are added based on the coupling topology structure to realize the precise regulation of the mutual coupling between adjacent resonators. Simulation is performed by using the simulation software, and the parameters of the four-mode filter are optimized to make the return loss, insertion loss, transmission zero point and other indexes of the filter meet the requirements of the base station filter. The dielectric constant and size of the dielectric material are accurately controlled in the embodiment to ensure that the frequency of the resonant mode can accurately fall in the target frequency band, and the resonant mode is effectively regulated by embedding the blind holes. The localization effect of the dielectric material on the electromagnetic wave and the influence of the multiple blind holes on the electromagnetic field distribution are utilized to realize the accurate control of the resonant mode. In this way, the selectivity and frequency stability of the filter are effectively improved, the volume and weight are reduced, and the miniaturization and light weight of the filter are realized. Therefore, the technical scheme of the present application effectively solves the problem of large size of the filter in the related art.

[0050] Specifically, the electromagnetic simulation software mentioned above is HFSS and / or CST.

[0051] AsFigure 1 As shown in the embodiment, the four resonant modes are two pairs of odd and even modes, the first resonant mode and the second resonant mode in the first plane are both transverse magnetic modes, and the third resonant mode in the second plane and the fourth resonant mode in the third plane are both transverse electric modes. By designing a specific electromagnetic field distribution, two pairs of odd and even modes are simultaneously excited in a single dielectric resonator, which fully utilizes the multi-mode characteristics of dielectric materials and enables higher filtering performance in a smaller space.

[0052] The combination of transverse magnetic modes and transverse electric modes utilizes the vertical and horizontal components of electromagnetic fields. By controlling the phase and amplitude of these components, complex electromagnetic responses can be generated, enabling more precise frequency selection. Such a setup effectively improves the frequency selectivity and stopband rejection capability of the dielectric waveguide filter while reducing the loss.

[0053] As shown in the embodiment, the four resonant modes are two pairs of odd and even modes, the first resonant mode and the second resonant mode in the first plane are both transverse magnetic modes, and the third resonant mode in the second plane and the fourth resonant mode in the third plane are both transverse electric modes. By designing a specific electromagnetic field distribution, two pairs of odd and even modes are simultaneously excited in a single dielectric resonator, which fully utilizes the multi-mode characteristics of dielectric materials and enables higher filtering performance in a smaller space. Figure 1 Figure 2 As shown in the embodiment, the four resonant modes are two pairs of odd and even modes, the first resonant mode and the second resonant mode in the first plane are both transverse magnetic modes, and the third resonant mode in the second plane and the fourth resonant mode in the third plane are both transverse electric modes. By designing a specific electromagnetic field distribution, two pairs of odd and even modes are simultaneously excited in a single dielectric resonator, which fully utilizes the multi-mode characteristics of dielectric materials and enables higher filtering performance in a smaller space.

[0054] Step S11: Select the target dielectric material according to the volume, Q value, and dielectric constant;

[0055] Step S12: Adjust the size of the target dielectric material to adjust the frequency range.

[0056] The embodiment ensures the optimal performance of the filter in the target frequency band. The dielectric constant determines the propagation speed of electromagnetic waves in the medium, thereby affecting the resonant frequency; while the quality factor reflects the energy loss characteristics of the dielectric material, directly affecting the insertion loss and temperature stability of the filter. The technology in the embodiment ensures that the dielectric waveguide filter has low insertion loss, high temperature stability, and good frequency selectivity in the target frequency band.

[0057] Specifically, the passband index requirements include passband frequency, bandwidth, return loss, and transmission zero position. Based on the required design passband index, considering factors such as volume and Q value, a dielectric material with a dielectric constant Ek = 45.22 and a Qf = 40000 is selected to design the resonator. The electromagnetic simulation model of the rectangular dielectric resonator is constructed, and the resonant frequency of the rectangular dielectric block is adjusted by adjusting the length, width, and height of the dielectric block to achieve the required frequency range.

[0058] ​Based on the relationship between the resonant frequency and the size of the resonator (the resonant frequency is inversely proportional to the size of the dielectric resonator, the smaller the size of the dielectric resonator, the higher the resonant frequency), the length * width * height (L*W*H) of the rectangular dielectric resonator is set to 14mm*12mm*6mm.

[0059] As shown in Figure 1 and Figure 3 In this embodiment, step S20: electromagnetic field distribution analysis is performed on a single four-mode dielectric waveguide resonator with a set size, and the resonant mode distribution position is located according to the distribution of the electromagnetic field.

[0060] Step S21: for the resonant mode of the first plane, embed two first resonant blind holes 110 and second resonant blind holes 120 about the center symmetry to construct the first resonant mode and the second resonant mode, and for the second plane and the third plane, embed two second resonant blind holes 120 and third resonant blind holes 130 about the center symmetry to construct the third resonant mode and the fourth resonant mode.

[0061] Step S22: set the adjacent planes of the dielectric block as the first plane, the second plane and the third plane, set the first resonant blind hole 110 and the second resonant blind hole 120 on the first plane, set a pair of third resonant blind holes 130 on the second plane, and set a fourth resonant blind hole 140 on the third plane; wherein the first resonant blind hole 110 and the second resonant blind hole 120 are arranged on the horizontal center symmetry line of the first plane, the third resonant blind hole 130 is arranged on the horizontal center symmetry line of the second plane, and the fourth resonant blind hole 140 is arranged on the horizontal center symmetry line of the third plane.

[0062] Step S23: adjust the resonant frequency of the first resonant mode through the first resonant blind hole 110, adjust the resonant frequency of the second resonant mode through the second resonant blind hole 120, adjust the resonant frequency of the third resonant mode through the third resonant blind hole 130, and adjust the resonant frequency of the fourth resonant mode through the fourth resonant blind hole 140; the resonant frequencies of the four resonant modes all show a linear decreasing trend with the increase of the depth of the resonant blind hole.

[0063] As shown in Figure 4 For the rectangular dielectric waveguide resonator, there are different mode electromagnetic field distributions in three dimensional directions, for the resonant mode of the first plane, embed two first resonant blind holes 110 and second resonant blind holes 120 about the center symmetry to construct a pair of odd modes and even modes (first resonant mode and second resonant mode), and for the second plane and the third plane, embed two second resonant blind holes 120 and third resonant blind holes 130 about the center symmetry to construct another pair of odd modes and even modes (third resonant mode and fourth resonant mode).

[0064] As shown in Figure 4As shown, the medium block includes adjacent first, second and third planes, wherein the first plane is provided with a first resonant blind hole 110 and a second resonant blind hole 120, and the second and third planes are provided with a pair of third resonant blind holes 130 and fourth resonant blind holes 140; wherein the first resonant blind hole and the second resonant blind hole are arranged on the horizontal center symmetry line of the first plane, and the third resonant blind hole and the fourth resonant blind hole are arranged on the horizontal center symmetry line of the second and third planes.

[0065] As shown in FIG. 1, Figure 4 Based on the distribution law of the spatial electromagnetic field in the resonator, the first resonant blind hole and the second resonant blind hole are arranged on the first plane to respectively regulate the resonant frequencies of the first and second resonant modes, and the third resonant blind hole and the fourth resonant blind hole are respectively arranged on the second and third planes to respectively regulate the resonant frequencies of the third and fourth resonant modes. The resonant frequencies of the four resonant modes all show a linear decreasing trend with the increase of the depth of the resonant blind hole. The aperture of the pair of first resonant blind holes is the same as that of the pair of second resonant blind holes, and the depths of the first, second, third and fourth resonant blind holes are all different.

[0066] The above arrangement realizes independent regulation of the four resonant modes by precisely embedding blind holes on different planes of the four-mode medium waveguide resonator. Specifically, the changes in the depths of the first resonant blind hole 110, the second resonant blind hole 120, the third resonant blind hole 130 and the fourth resonant blind hole 140 directly affect the distribution of the electromagnetic field, thereby changing the resonant frequencies. This regulation mechanism is designed based on the electromagnetic properties of the dielectric material. The technology of the present embodiment enables the medium waveguide filter to achieve more flexible frequency configuration while maintaining high performance.

[0067] As shown in FIG. 1, Figure 4 and Figure 6 In the present embodiment, the apertures of the first resonant blind hole 110 and the second resonant blind hole 120 are the same, and the depths of the first resonant blind hole 110, the second resonant blind hole 120, the third resonant blind hole 130 and the fourth resonant blind hole 140 are all different.

[0068] By controlling the depth differences of the first resonant blind hole 110, the second resonant blind hole 120, the third resonant blind hole 130 and the fourth resonant blind hole 140 instead of the aperture sizes, independent regulation of different resonant modes is realized, which takes advantage of the non-uniformity of the internal electromagnetic field distribution of the dielectric material. The first resonant blind hole 110, the second resonant blind hole 120, the third resonant blind hole 130 and the fourth resonant blind hole 140 with different depths have different degrees of disturbance to the electromagnetic field, thereby affecting the frequencies of the resonant modes. This design fully utilizes the multi-mode characteristics of the dielectric material.

[0069] The above arrangement not only simplifies the processing technology but also improves the performance consistency of the dielectric waveguide filter.

[0070] As shown in Figure 4 and Figure 6 In the present embodiment, the depth of the first resonant blind hole 110 is less than the depth of the second resonant blind hole 120, and the depth of the third resonant blind hole 130 is greater than the depth of the fourth resonant blind hole 140. The present embodiment realizes precise regulation of different resonant modes through the layout of the first resonant blind hole 110, the second resonant blind hole 120, the third resonant blind hole 130, and the fourth resonant blind hole 140 with different depths, which is based on the in-depth understanding and control of the electromagnetic field distribution inside the dielectric material.

[0071] Specifically, the blind hole with smaller depth has weaker disturbance to the electromagnetic field, while the blind hole with larger depth has stronger disturbance. Through this differentiated regulation strategy, fine adjustment of the frequency of different resonant modes can be realized. In this way, high performance of the filter in the target frequency band can be ensured, while the processing difficulty is reduced and the production efficiency is improved.

[0072] The working process of the construction method of the present embodiment is as follows:

[0073] First, based on the target passband index, select appropriate dielectric material, establish a four-mode dielectric waveguide resonator model, and adjust the resonator size to make the resonant mode frequency fall within the target frequency band. Then, through electromagnetic field distribution analysis of the four-mode dielectric waveguide resonator with the set size, the distribution positions of different resonant modes are determined, and blind holes are embedded at these positions to realize regulation of the resonant modes.

[0074] Then, based on the frequency regulation of the resonator, select appropriate coupling topology structure, construct the dielectric waveguide filter, and realize precise control of the mutual coupling between adjacent resonators by adding additional coupling blind holes.

[0075] Finally, the electromagnetic simulation software is used to optimize the filter parameters to ensure that the performance indicators meet the needs of the base station filter. In the whole working process, by accurately controlling the dielectric constant of the dielectric material, the resonator size and the blind hole layout, the miniaturization, high performance and multi-functional integration of the filter are realized.

[0076] According to a second aspect of the present application, a dielectric waveguide filter is provided, which is constructed by the above construction method, as shown in Figures 4 to 9As shown, the medium waveguide filter of the embodiment includes a four-mode medium waveguide resonator having adjacent first, second and third planes, the first plane is provided with a first resonant blind hole 110 and a second resonant blind hole 120, the second plane is provided with a third resonant blind hole 130, and the third plane is provided with a fourth resonant blind hole 140; wherein the first resonant blind hole 110 and the second resonant blind hole 120 are arranged on the horizontal center symmetry line of the first plane, the third resonant blind hole 130 is arranged on the horizontal center symmetry line of the second plane, and the fourth resonant blind hole 140 is arranged on the horizontal center symmetry line of the third plane, and the four-mode medium waveguide resonator is provided with a first input end 310 and a first output end 320.

[0077] The above arrangement utilizes the multi-mode characteristics of the dielectric material and the non-uniformity of the electromagnetic field distribution, and the first resonant blind hole 110, the second resonant blind hole 120, the third resonant blind hole 130 and the fourth resonant blind hole 140 are arranged on different planes of the four-mode medium waveguide resonator, thereby constructing the four-mode medium waveguide resonator.

[0078] Specifically, the first resonant blind hole 110, the second resonant blind hole 120, the third resonant blind hole 130 and the fourth resonant blind hole 140 on different planes have different regulating effects on the electromagnetic field, and through reasonable layout and depth control, effective excitation and frequency adjustment of the four resonant modes can be achieved, thereby effectively realizing the miniaturization, high performance and multi-functional integration of the filter.

[0079] It should be noted that by arranging the first resonant blind hole 110, the second resonant blind hole 120, the third resonant blind hole 130 and the fourth resonant blind hole 140 on different planes of the medium waveguide resonator, multi-mode resonance is achieved, and the positions and depths of the first resonant blind hole 110, the second resonant blind hole 120, the third resonant blind hole 130 and the fourth resonant blind hole 140 accurately regulate the frequency of specific electromagnetic modes, thereby ensuring the frequency selectivity and stability of the filter.

[0080] In addition, by utilizing the high dielectric constant and low loss characteristics of the dielectric material, through electromagnetic field distribution analysis and directional regulation, a compact multi-mode resonant unit is formed, and the unification of small size and high performance is realized.

[0081] Specifically, by precisely controlling the frequency and coupling of each resonant mode, low insertion loss, high suppression performance and stable temperature response are achieved, thereby significantly improving the performance indicators of the filter. The four-mode dielectric waveguide resonator is provided with a coupling through slot, which is located at the center of the four-mode dielectric waveguide resonator and is used to control the coupling between the first resonant blind hole 110, the second resonant blind hole 120, the third resonant blind hole 130 and the fourth resonant blind hole 140. The introduction of the coupling through slot provides a precise coupling path for adjacent resonant modes. By adjusting its size (length and width), the coupling strength between modes can be fine-tuned, and the bandwidth and selectivity of the dielectric waveguide filter can be optimized.

[0082] Specifically, the coupling through slot utilizes the cross-coupling effect of electromagnetic field to generate transmission zeros on both sides of the passband, thereby enhancing the frequency selectivity and out-of-band suppression capability of the filter. In this way, the performance indicators of the dielectric waveguide filter are closely matched with the theoretical design values, ensuring the stability and reliability of the filter in practical applications. The four-mode dielectric waveguide resonator is also provided with a first coupling blind hole 210, a second coupling blind hole 220, a third coupling blind hole 230 and a fourth coupling blind hole 240. The first coupling blind hole 210, the second coupling blind hole 220 and the fourth coupling blind hole 240 are arranged on the fourth plane of the dielectric block, and the fourth plane is arranged opposite to the first plane. The third coupling blind hole 230 is arranged on the first plane and is used to form a virtual negative coupling.

[0083] The present embodiment further regulates the coupling between resonant modes by arranging additional coupling blind holes on different planes of the dielectric block. In particular, the virtual negative coupling effect of the third coupling blind hole enhances the passband selectivity of the filter and the ability to suppress out-of-band spurious modes. Specifically, the coupling blind hole changes the distribution of electromagnetic field, thereby affecting the coupling coefficient between resonant modes and optimizing the frequency response characteristics of the filter. In this way, the performance of the filter is effectively improved, including lower insertion loss, higher out-of-band suppression and more stable temperature response.

[0084] As shown in Figures 4 to 10 the first coupling blind hole 210 is arranged adjacent to the first resonant blind hole 110 and between the first resonant blind hole 110 and the fourth resonant blind hole 140; the second coupling blind hole 220 is arranged adjacent to the second resonant blind hole 120 and between the second resonant blind hole 120 and the fourth resonant blind hole 140; the third coupling blind hole 230 is arranged adjacent to the second resonant blind hole 120 and between the second resonant blind hole 120 and the third resonant blind hole 130; the fourth coupling blind hole 240 is arranged adjacent to the first resonant blind hole 110 and between the first resonant blind hole 110 and the third resonant blind hole 130; and the center of the first coupling blind hole 210 and the center of the second coupling blind hole 220 are located on the same plane.

[0085] This embodiment achieves directional control of the coupling of each resonant mode by precisely arranging the relative positions of the first coupling blind hole 210, the second coupling blind hole 220, the third coupling blind hole 230, and the fourth coupling blind hole 240 with the first resonant blind hole 110, the second resonant blind hole 120, the third resonant blind hole 130, and the fourth resonant blind hole 140, thus ensuring a high degree of consistency between the filter's performance indicators and the design goals.

[0086] Specifically, the positions of the first coupling blind aperture 210, the second coupling blind aperture 220, the third coupling blind aperture 230, and the fourth coupling blind aperture 240 determine their coupling effect on specific electromagnetic modes. By setting the first coupling blind aperture 210, the second coupling blind aperture 220, the third coupling blind aperture 230, and the fourth coupling blind aperture 240 on different planes, independent control of the coupling of different modes can be achieved, optimizing the filter's bandpass response and out-of-band rejection performance. This achieves comprehensive optimization of the dielectric waveguide filter's performance, including a narrower passband, lower insertion loss, and a steeper out-of-band roll-off characteristic.

[0087] Specifically, the center of the first coupling blind via 210 is located midway between the center of the first resonant blind via 110 and the center of the fourth resonant blind via 140; the center of the second coupling blind via 220 is located midway between the center of the second resonant blind via 120 and the center of the fourth resonant blind via 140; the center of the third coupling blind via 230 is located midway between the center of the second resonant blind via 120 and the center of the third resonant blind via 130; and the center of the fourth coupling blind via 240 is located midway between the center of the first resonant blind via 110 and the center of the third resonant blind via 130. The centers of the first coupling blind via 210 and the second coupling blind via 220 are located on the same plane, and the distance from the center of the first coupling blind via 210 to the second plane of the dielectric block is the same as the distance from the center of the second coupling blind via 220 to the second plane of the dielectric block.

[0088] like Figures 4 to 10 As shown, in this embodiment, the diameters of the first coupling blind hole 210, the second coupling blind hole 220, the third coupling blind hole 230, and the fourth coupling blind hole 240 are all the same, while the depths of the first coupling blind hole 210, the second coupling blind hole 220, the third coupling blind hole 230, and the fourth coupling blind hole 240 are all different.

[0089] By adjusting the depths of the first coupling blind hole 210, the second coupling blind hole 220, the third coupling blind hole 230 and the fourth coupling blind hole 240, rather than the aperture size, independent regulation of the coupling strength of different resonance modes is achieved, ensuring the optimization of the filter performance. Specifically, the depths of the first coupling blind hole 210, the second coupling blind hole 220, the third coupling blind hole 230 and the fourth coupling blind hole 240 directly affect the coupling strength between them and the resonance mode. By depth adjustment, fine tuning of the coupling coefficient can be achieved, thereby optimizing the frequency response characteristics of the filter. In this way, the performance of the dielectric waveguide filter is comprehensively optimized, including lower insertion loss, higher out-of-band rejection and more stable temperature response.

[0090] The working principle of the dielectric waveguide filter is as follows:

[0091] The base station filter relies on the resonant unit (metal cavity or ceramic dielectric) to form a high-Q standing wave field, and constructs a bandpass response by precisely controlling the electromagnetic coupling between adjacent resonators: low-loss transmission is achieved in the target frequency band (such as 3.5GHz±100MHz of 5G), while transmission zeros are generated in the stop band by cross-coupling technology to strongly suppress adjacent frequency interference. The metal cavity is suitable for high-power macro base stations due to screw tuning and solid structure, while the dielectric waveguide resonator uses dielectric constant to compress the wavelength, making the volume shrink by more than several dozen times, becoming the core choice of 5G Massive MIMO antenna. Its performance directly determines the signal purity and energy consumption of the base station, and is the cornerstone component of modern wireless communication networks.

[0092] The technical scheme of the embodiment relates to a working process and a use process.

[0093] In the working process, the signal enters the dielectric waveguide filter from the input end, is frequency-selected by the four-mode dielectric waveguide resonator, suppresses out-of-band interference, allows only signals in the target frequency band to pass, and is finally output from the output end.

[0094] In the use process, the dielectric waveguide filter is integrated into a base station, a satellite communication system or an emergency communication device as a key component of a radio frequency front end, ensuring the signal purity and reliability of the system. By precisely controlling the resonance mode and coupling structure, the filter can adapt to various environmental conditions, including temperature changes, vibration impacts and electromagnetic interference, thereby maintaining stable performance in actual application.

[0095] It should be noted that the four-mode dielectric waveguide resonator of the embodiment is a multi-mode dielectric waveguide resonator.

[0096] Multi-Mode Dielectric Waveguide Resonator (MMDWR) successfully overcomes the bottleneck of traditional metal cavity resonator in miniaturization, temperature stability and high-density integration by virtue of its unique working principle of exciting and controlling multiple electromagnetic modes and their coupling inside high dielectric constant εr, low-loss dielectric material. Specifically, the main application scenarios of multi-mode dielectric waveguide resonator are as follows:

[0097] 1. Next-generation mobile communication system (5G-Advanced / 6G):

[0098] Massive MIMO active antenna unit: Massive MIMO is the key to improving the capacity and spectral efficiency of 5G / 6G. The AAU needs to integrate dozens or even hundreds of independent transceiver channels (TRX), and each channel needs an independent filter. The extremely small size (up to 1 / 5 to 1 / 10 of the traditional metal cavity or even smaller) and lightweight characteristics of MMDWR allow the integration of a large number of filter units in a very compact AAU physical space, which is the prerequisite for realizing a super large antenna array (such as 1024+ elements) and ensuring channel isolation. In the upcoming 6G millimeter wave and sub-THz frequency bands, the shortened wavelength makes the manufacture of even small-sized metal cavities extremely difficult and costly. MMDWR uses high-εr dielectric to achieve sub-wavelength size resonance, which is the inevitable choice for practical filters in high-frequency bands.

[0099] 2. Satellite communication, such as satellite / airborne / shipborne communication terminals and transponders:

[0100] The satellite platform space is extremely valuable, and the equipment must be lightweight and resistant to extreme temperature cycles and high vibration impact environment. Starlink, LEO constellation, etc. have extremely high requirements for terminal miniaturization. This scheme can significantly reduce the payload weight, reduce launch costs and increase on-board capacity. In addition, by choosing a dielectric ceramic material with small temperature drift to design the filter, the MMDWR resonant frequency is almost not affected by temperature changes, eliminating the need for bulky and complex temperature compensation mechanisms (TEC), improving system reliability and life.

[0101] The dielectric filter acts as a "space-level spectrum purifier" in satellite communication, achieving ultra-low insertion loss of 0.2-0.5 dB with high-Q ceramic dielectric, directly reducing satellite power amplifier power consumption by more than 10%, and achieving steep transition bands through dielectric multi-mode coupling technology, achieving high adjacent channel interference isolation in Ka-band dense channels. Its all-ceramic structure fundamentally avoids the risk of vacuum micro-discharge, and the thermal stability (τ f≤±1ppm / ℃) can suppress the frequency offset within a very small range under the extreme temperature difference of the orbit (-180~+150℃). When applied to a satellite-borne transponder, the single dielectric block integrated 5th order filtering significantly reduces the weight, and the laser ablation fine-tuning process guarantees the consistency of mass production. In cutting-edge loads, its high out-of-band suppression capability significantly improves the deep space signal resolution sensitivity. In the future, the BST reconfigurable dielectric can support on-orbit spectrum dynamic reconfiguration. With the reliability of electromagnetic zero compromise, it becomes an irreplaceable cornerstone component for high-orbit satellites, low-orbit constellations, and inter-satellite laser communication. The satellite load penetration rate has increased significantly in the past decade.

[0102] The communication connection between the satellite and the ground is realized through an end-to-end transmission chain: the ground user terminal (Ku / Ka band) transmits signals to the gateway station, which transmits the signals to the baseband processing center through ROF optical transmission; the gateway station amplifies and converts the signals to the satellite through C-band uplink; the satellite-borne transponder uses a dielectric filter array to complete channel slicing, and a traveling wave tube amplifier (TWTA) to boost power; the processed signals are converted to C-band downlink and broadcast to the gateway station, and finally connected to the core network through baseband demodulation. Among them, the geosynchronous orbit system (GEO) relies on precise pointing antennas to compensate for time and space losses, while the low-orbit constellation (LEO) uses phased array electronic beam tracking to achieve ultra-low latency connection. With Ka-band beams, adaptive rain attenuation power control, and Beidou / GPS nanosecond-level timing coordination, it establishes reliable satellite-ground links in complex environments, and significantly increases the coverage span of single-hop.

[0103] 3. Emergency communication, such as: vehicle-mounted integrated communication terminal:

[0104] In the emergency communication scenario, the dielectric filter becomes a key guarantee due to its strong environmental robustness and spectral agility: based on a single ceramic block, the traditional single-mode metal cavity filter circuit is replaced, and the device volume is greatly reduced. The reconfigurable filter group based on ceramic can realize instantaneous switching of bandwidth 20MHz→40MHz (response time <200μs) through 0-300V bias, and dynamically adapt to the fragmented spectrum temporarily allocated in disaster areas; its ceramic body without metal plating can resist sand / dust / salt spray corrosion and maintain insertion loss degradation ≤0.8dB in high humidity environment; integrated 32-channel filter array with 80dB out-of-band suppression to isolate public network interference (4G / 5G frequency band), and explosion-proof shell to ensure 100% reliable transmission of rescue instructions under extreme temperature difference of -40℃ to +85℃—providing a "pure channel in electromagnetic chaos" for vehicle-mounted base stations, portable relays and other devices.

[0105] According to a third aspect of the present application, a dielectric waveguide duplexer is provided, such as Figures 11 to 14As shown, the medium waveguide duplexer of the embodiment includes a second input end 330, a second output end 340 and a third output end 350; a first medium waveguide filter arranged between the second input end 330 and the second output end 340; a second medium waveguide filter arranged between the second input end 330 and the third output end 350; a feeding blind hole, which is coupled with a four-mode medium resonator in the first medium waveguide filter and simultaneously coupled with a four-mode medium waveguide resonator in the second medium waveguide filter; the first input end 310 is arranged below the feeding blind hole, the second output end 340 is arranged on the four-mode medium resonator of the first medium waveguide, and the third output end 350 is arranged on the four-mode medium waveguide resonator in the second medium waveguide filter; wherein the first medium waveguide filter is the medium waveguide filter described above, and the second medium waveguide filter is the medium waveguide filter described above.

[0106] The embodiment realizes the function of the duplexer by integrating two medium waveguide filters and a feeding blind hole, that is, simultaneously processing signals of two different frequency bands in the same physical structure. The feeding blind hole serves as a common input end, and through the coupling of the feeding blind hole with the two filters, frequency separation of the signals is realized. Through the integrated design, the structure of the duplexer is simplified, and the performance indexes thereof are improved, including lower insertion loss, higher out-of-band rejection and more stable temperature response.

[0107] In the description of the present application, it should be understood that "a plurality of" means two or more than two. The orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0108] For purposes of the description hereinafter, spatial or directional terms, for example, "above", "below", "upper", "lower", and the like, can be used, and relate to the device as illustrated in the figures. However, it is to be understood that no absolute or relative orientation of the device is intended or implied, unless specifically described as such. Terms concerning attachments, coupling and the like, such as "connected" and "coupled" and the like, are to be construed in accordance with their normal meanings, that is, as referring to an indirect or direct connection or coupling. Any reference to "comprising" or "containing" is to be construed as meaning "comprising or containing, but not limited to". Any reference to "comprising" or "containing" is to be construed as meaning "comprising or containing, but not limited to".

[0109] In addition, it should be pointed out that the use of the terms "first", "second" and the like, to describe various elements, is merely intended to differentiate the elements from one another, and does not connote any special order or order of precedence, unless otherwise specifically indicated. Thus, the use of the terms "first", "second" and the like, is not intended to limit the scope of the present application, and is not intended to connote any special order or order of precedence.

[0110] The preferred embodiments herein disclosed are not intended to limit or restrict the scope of the application, but merely convey the best mode contemplated by the inventors of carrying out the claimed application. Modifications can be made by those skilled in the art, which yet fall within the scope of the present application. Therefore, it is, therefore, to be understood that any variations made to the application are to be considered as being within the scope of the present application as defined by the appended claims, if any, and their equivalents.

Claims

1. A method of constructing a dielectric waveguide filter, characterized by, The application relates to a method for designing a matrix four-mode dielectric waveguide resonator. Based on the given target passband index, a dielectric material is selected; a matrix four-mode dielectric waveguide resonator is established, and the size of the rectangular dielectric waveguide is adjusted to make the resonant mode frequency reach the target frequency band; The electromagnetic field distribution of a single four-mode dielectric waveguide resonator with a set size is analyzed, the resonant mode distribution position is located according to the electromagnetic field distribution, and four blind holes are respectively embedded at the positions with the strongest electromagnetic field distribution to realize polarization fixing and frequency regulation of the resonant mode; Based on the frequency regulation of the four-mode dielectric waveguide resonator, a coupling topology is selected to construct a dielectric filter; Based on the coupling topology structure, additional coupling blind holes are added to realize regulation of the mutual coupling between adjacent resonators, and the parameters of the dielectric waveguide filter are optimized through simulation.

2. The method of construction of a dielectric waveguide filter according to claim 1, characterized in that, The four resonant modes are two pairs of odd and even modes, the first resonant mode and the second resonant mode in the first plane are both transverse magnetic modes, and the third resonant mode in the second plane and the fourth resonant mode in the third plane are both transverse electric modes.

3. The method of constructing a dielectric waveguide filter according to claim 2, wherein, Based on the given target passband index, a dielectric material with a dielectric constant is selected; a matrix four-mode dielectric waveguide resonator is established, and the size of the rectangular dielectric waveguide is adjusted to make the resonant mode frequency reach the target frequency band. The target dielectric material is selected according to the volume, Q value and dielectric constant; The size of the dielectric block of the target dielectric material is adjusted to regulate the frequency range.

4. The method of constructing a dielectric waveguide filter according to claim 3, wherein, The electromagnetic field distribution of a single four-mode dielectric waveguide resonator with a set size is analyzed, the resonant mode distribution position is located according to the electromagnetic field distribution, and four blind holes are respectively embedded at the positions with the strongest electromagnetic field distribution to realize polarization fixing and frequency regulation of the resonant mode; For the resonant mode of the first plane, two first resonant blind holes (110) and second resonant blind holes (120) are embedded to construct the first resonant mode and the second resonant mode, and two second resonant blind holes (120) and third resonant blind holes (130) are respectively embedded in the second plane and the third plane to construct the third resonant mode and the fourth resonant mode; The adjacent planes of the dielectric block are set as the first plane, the second plane and the third plane, the first resonant blind hole (110) and the second resonant blind hole (120) are arranged on the first plane, a pair of third resonant blind holes (130) are arranged on the second plane, and a fourth resonant blind hole (140) is arranged on the third plane; wherein the first resonant blind hole (110) and the second resonant blind hole (120) are arranged on the horizontal center symmetry line of the first plane, the third resonant blind hole (130) is arranged on the horizontal center symmetry line of the second plane, and the fourth resonant blind hole (140) is arranged on the horizontal center symmetry line of the third plane; The resonant frequency of the first resonant mode is regulated through the first resonant blind hole (110), the resonant frequency of the second resonant mode is regulated through the second resonant blind hole (120), the resonant frequency of the third resonant mode is regulated through the third resonant blind hole (130), and the resonant frequency of the fourth resonant mode is regulated through the fourth resonant blind hole (140); the resonant frequencies of the four resonant modes all show a linear decreasing trend with the increase of the depth of the resonant blind hole.

5. The method of constructing a dielectric waveguide filter according to claim 4, wherein, The first resonant blind hole (110) and the second resonant blind hole (120) have the same aperture, and the depths of the first resonant blind hole (110), the second resonant blind hole (120), the third resonant blind hole (130) and the fourth resonant blind hole (140) are all different.

6. The method of constructing a dielectric waveguide filter according to claim 4, wherein, The depth of the first resonant blind hole (110) is less than the depth of the second resonant blind hole (120), and the depth of the third resonant blind hole (130) is greater than the depth of the fourth resonant blind hole (140).

7. A dielectric waveguide filter, characterized by, The medium waveguide filter is constructed by the construction method in any one of claims 1 to 6, and the medium waveguide filter comprises a four-mode medium waveguide resonator having adjacent first, second and third planes, wherein the first resonant blind hole (110) and the second resonant blind hole are arranged on the first plane, the third resonant blind hole (130) is arranged on the second plane, and the fourth resonant blind hole (140) is arranged on the third plane; wherein the first resonant blind hole (110) and the second resonant blind hole (120) are arranged on the horizontal center symmetry line of the first plane, the third resonant blind hole (130) is arranged on the horizontal center symmetry line of the second plane, the fourth resonant blind hole (140) is arranged on the horizontal center symmetry line of the third plane, and the four-mode medium waveguide resonator is provided with a first input end (310) and a first output end (320).

8. The dielectric waveguide filter of claim 7, wherein, The four-mode medium waveguide resonator is provided with a coupling through slot, the coupling through slot is located at the center position of the four-mode medium waveguide resonator, and the coupling through slot is used for controlling the coupling between the first resonant blind hole (110), the second resonant blind hole (120), the third resonant blind hole (130) and the fourth resonant blind hole (140).

9. The dielectric waveguide filter of claim 7, wherein, The four-mode medium waveguide resonator is further provided with a first coupling blind hole (210), a second coupling blind hole (220), a third coupling blind hole (230) and a fourth coupling blind hole (240), the first coupling blind hole (210), the second coupling blind hole (220) and the fourth coupling blind hole (240) are arranged on the fourth plane of the medium block, the fourth plane is arranged opposite to the first plane, and the third coupling blind hole (230) is arranged on the first plane and is used for forming a virtual negative coupling.

10. The dielectric waveguide filter of claim 9, wherein, The first coupling blind hole (210) is arranged adjacent to the first resonant blind hole (110) and between the first resonant blind hole (110) and the fourth resonant blind hole (140); the second coupling blind hole (220) is arranged adjacent to the second resonant blind hole (120) and between the second resonant blind hole (120) and the fourth resonant blind hole (140); the third coupling blind hole (230) is arranged adjacent to the second resonant blind hole (120) and between the second resonant blind hole (120) and the third resonant blind hole (130); the fourth coupling blind hole (240) is arranged adjacent to the first resonant blind hole (110) and between the first resonant blind hole (110) and the third resonant blind hole (130); the center of the first coupling blind hole (210) and the center of the second coupling blind hole (220) are located on the same plane.

11. The dielectric waveguide filter of claim 9, wherein, The aperture of the first coupling blind hole (210), the second coupling blind hole (220), the third coupling blind hole (230) and the fourth coupling blind hole (240) is the same, and the depth of the first coupling blind hole (210), the second coupling blind hole (220), the third coupling blind hole (230) and the fourth coupling blind hole (240) is not the same.

12. A dielectric waveguide diplexer, comprising: Comprise: A second input end (330), a second output end (340) and a third output end (350); A first dielectric waveguide filter arranged between the second input end (330) and the second output end (340); A second dielectric waveguide filter arranged between the second input end (330) and the third output end (350); A feeding blind hole, which is coupled to a four-mode dielectric resonator in the first dielectric waveguide filter and simultaneously coupled to a four-mode dielectric waveguide resonator in the second dielectric waveguide filter; The first input end (310) is arranged below the feeding blind hole, the second output end (340) is arranged on the four-mode dielectric resonator of the first dielectric waveguide, and the third output end (350) is arranged on the four-mode dielectric waveguide resonator in the second dielectric waveguide filter; The first dielectric waveguide filter is the dielectric waveguide filter of any one of claims 7 to 11, and the second dielectric waveguide filter is the dielectric waveguide filter of any one of claims 7 to 11.

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