Dielectric waveguide filter and communication equipment

Abstract

The utility model discloses a dielectric waveguide filter and communication equipment. The dielectric waveguide filter comprises a shell, at least one first resonant column and a plurality of second resonant columns, the first resonant column and the plurality of second resonant columns are respectively arranged on the shell, the resonant frequency of the first resonant column is located in a stop-band range of the filter, the first resonant column is used for introducing an additional transmission zero point, the resonant frequencies of the plurality of second resonant columns are located in a pass-band range of the filter, and the second resonant columns are used for introducing an additional transmission zero point. And the coupling among the plurality of second resonant columns is positive coupling. According to the invention, more limited transmission zeros can be realized on the basis of not increasing the size of the filter, and the frequency selection characteristic and the out-of-band rejection capability of the filter are improved, so that the structure of the filter is simplified, and the manufacturing cost is reduced.

Description

Technical Field

[0001] This application relates to the field of filter and microwave communication technology, and in particular to a dielectric waveguide filter and communication device. Background Technology

[0002] Dielectric waveguide filters have attracted widespread attention in the field of microwave filters due to their advantages such as miniaturization, high selectivity, and low cost. The synthesis and design methods of dielectric waveguide filters have always been a research hotspot in this field. In filter synthesis theory, positive coupling usually represents magnetic coupling, and negative coupling represents electrical coupling. In practical design, the implementation of negative coupling needs to be emphasized, as this typically requires complex structures. For dielectric waveguide filters, the implementation of negative coupling relies on blind via structures, which to some extent increases the complexity and difficulty of the design.

[0003] Therefore, existing technologies still need to be improved and developed. Utility Model Content

[0004] The main purpose of this application is to provide a dielectric waveguide filter and communication device, which aims to solve the problem that the dielectric waveguide filter in the prior art achieves negative coupling by means of a complex blind hole structure, resulting in a more complex design and higher manufacturing cost.

[0005] The first aspect of this application provides a dielectric waveguide filter, which includes a housing, at least one first resonant post, and a plurality of second resonant posts. The first resonant post and the plurality of second resonant posts are respectively disposed on the housing. The resonant frequency of the first resonant post is within the stopband range of the filter. The first resonant post is used to introduce an additional transmission zero. The resonant frequencies of the plurality of second resonant posts are within the passband range of the filter. The coupling between the plurality of second resonant posts is positive coupling.

[0006] Optionally, in one embodiment of this application, the housing is provided with a first power supply port and a second power supply port. The first power supply port is located at the input end of the housing, and the second power supply port is located at the output end of the housing. The first power supply port is used to input microwave signals, and the second power supply port is used to output microwave signals.

[0007] Optionally, in one embodiment of this application, the housing is provided with a slot, and the first resonant post and a plurality of second resonant posts are arranged around the slot.

[0008] Optionally, in one embodiment of this application, the passband range is 2530MHz-2670MHz.

[0009] Optionally, in one embodiment of this application, there is one first resonant pillar and four second resonant pillars.

[0010] Optionally, in one embodiment of this application, there are two first resonant pillars and eight second resonant pillars.

[0011] Optionally, in one embodiment of this application, one first resonant pillar and four second resonant pillars are located on one side of the slot, and another first resonant pillar and another four second resonant pillars are located on the other side of the slot, wherein the slot is used to reduce the coupling between the two first resonant pillars and the plurality of second resonant pillars.

[0012] Optionally, in one embodiment of this application, the housing is provided with a plurality of coupling holes, some of which are located between one first resonant post and four second resonant posts, and other of which are located between another first resonant post and another four second resonant posts.

[0013] Optionally, in one embodiment of this application, a tuning screw is provided on the top of a plurality of second resonant pillars, the tuning screw being used to adjust the self-resonant frequency; and / or a coupling diaphragm is provided on the housing, the coupling diaphragm being used to reduce the coupling between the two first resonant pillars and the plurality of second resonant pillars.

[0014] A second aspect of this application also provides a communication device, wherein the communication device includes a dielectric waveguide filter as described in any of the above embodiments.

[0015] Beneficial effects: This application provides a dielectric waveguide filter and communication device. By transforming the blind hole structure, which was originally considered to be negatively coupled, into a resonator (i.e., the first resonant pillar) that resonates outside the band, this application achieves more finite transmission zeros without increasing the filter volume, and improves the frequency selectivity and out-of-band rejection capability of the filter, thereby simplifying the filter structure and reducing manufacturing costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural diagram of an embodiment of the dielectric waveguide filter of this application;

[0018] Figure 2This is a structural diagram of Embodiment 2 of the dielectric waveguide filter of this application;

[0019] Figure 3 This is a schematic diagram of the structure of the dielectric waveguide filter in Embodiment 2 of this application from another perspective.

[0020] Explanation of reference numerals in the attached figures:

[0021] 10. Housing; 101. Groove; 102. Coupling hole; 20. First resonant post; 30. Second resonant post; 40. First feed port; 50. Second feed port.

[0022] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0023] To make the objectives, technical solutions, and effects of this application clearer and more explicit, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only possible technical implementations of this application and not all possible implementations. Based on the embodiments in this application, those skilled in the art can obtain other embodiments without creative effort, and these embodiments are also within the protection scope of this application.

[0024] In related technologies, negative coupling usually requires complex structures to achieve, such as blind aperture structures, which increases the complexity of filter design. The need for complex structures to achieve negative coupling also leads to increased manufacturing costs. Traditional negative coupling designs may limit the flexibility of filter design, especially when pursuing higher frequency selectivity and smaller size.

[0025] First, let's introduce the terms used in the embodiments of this application:

[0026] Negative coupling refers to the coupling effect between two resonant elements in a microwave or radio frequency filter, which causes their resonant frequencies to shift in the opposite direction to positive coupling. Negative coupling is usually achieved through specific structures (such as blind apertures) and affects the frequency response and transmission characteristics of the filter.

[0027] Blind via structure: refers to a hole drilled in a dielectric substrate that does not penetrate the entire substrate. In microwave or radio frequency filters, blind vias can be used as resonators or to achieve specific coupling effects.

[0028] Resonance: refers to the resonant phenomenon that occurs in a physical system at a specific frequency. In microwave or radio frequency filters, resonance usually refers to the energy storage and release of a resonant unit (such as a resonator) at a specific frequency.

[0029] A resonator is a physical structure that can store and release electromagnetic energy. In microwave or radio frequency filters, resonators are usually the key element for achieving filtering functions.

[0030] A filter is a circuit element that allows signals within a specific frequency range to pass through while suppressing signals within other frequency ranges.

[0031] The dielectric waveguide filter and communication device according to embodiments of this application are described below with reference to the accompanying drawings. Addressing the problem mentioned above in the related art where dielectric waveguide filters rely on complex blind-hole structures to achieve negative coupling, resulting in complex design and high manufacturing costs, this application provides a dielectric waveguide filter. In this filter, the blind-hole structure, originally considered negatively coupled, is transformed into an out-of-band resonator (i.e., a first resonant pillar). This achieves more finite transmission zeros without increasing the filter's size, improves the filter's frequency selectivity and out-of-band rejection capability, simplifies the filter's structure, reduces manufacturing costs, and improves the filter's performance and reliability. Therefore, this solves the technical problem in the related art where dielectric waveguide filters rely on complex blind-hole structures to achieve negative coupling, leading to complex design and high manufacturing costs.

[0032] This application no longer treats the blind aperture structure as a negative coupling but rather as a resonator resonating out of band. Through the given synthesis theory, the occurrence of negative coupling can be completely avoided, and the out-of-band resonator can introduce additional transmission zeros, thereby improving the frequency selectivity of the filter. Compared with traditional dielectric waveguide filter design methods, this application can achieve more finite transmission zeros without increasing the filter size, exhibiting steep out-of-band rejection characteristics.

[0033] The technical solutions of this application will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0034] like Figure 1 and Figure 2As shown in the figure, this application provides a dielectric waveguide filter, which includes a housing 10, at least one first resonant post 20, and a plurality of second resonant posts 30. The first resonant post 20 and the plurality of second resonant posts 30 are respectively disposed on the housing 10. The resonant frequency of the first resonant post 20 is within the stopband range of the filter and is used to introduce additional transmission zeros. The resonant frequencies of the plurality of second resonant posts 30 are within the passband range of the filter, and the coupling between the plurality of second resonant posts 30 is positive coupling.

[0035] It is worth noting that this application avoids complex negative coupling structures and simplifies filter design by treating the blind hole structure as an out-of-band resonator; the introduction of the out-of-band resonator (i.e., the first resonant pillar 20) brings additional transmission zeros, improves the frequency selectivity of the filter, and achieves steep out-of-band rejection characteristics; it simplifies the design structure, avoids complex negative coupling structures, and reduces manufacturing costs; and by flexibly controlling the coupling coefficient between the resonant pillars, precise adjustment of the filter performance can be achieved.

[0036] It is understandable that resonance within the passband refers to the resonant frequency of the second resonant pillar 30 in the filter being located within the passband range of the filter. These second resonant pillars 30 collectively determine the passband characteristics of the filter, including the center frequency and bandwidth of the passband. Resonance at the low-end stopband refers to the resonant frequency of the first resonant pillar 20 in the filter being located in the stopband of the filter, and usually close to the low-frequency end of the passband. Although the first resonant pillar 20 does not directly participate in forming the passband, it can introduce additional transmission zeros within the stopband, thereby improving the frequency selectivity and out-of-band rejection capability of the filter.

[0037] In one embodiment of this application, the housing 10 is provided with a first power supply port 40 and a second power supply port 50. The first power supply port 40 is located at the input end of the housing 10, and the second power supply port 50 is located at the output end of the housing 10. The first power supply port 40 is used to input microwave signals, and the second power supply port 50 is used to output microwave signals.

[0038] It is understood that the feed port is the connection point between the filter and the external circuit, used for inputting and outputting microwave signals. In the embodiments of this application, the first feed port 40 and the second feed port 50 are located at the two ends of the filter, respectively, for signal input and output.

[0039] In one embodiment of this application, the housing 10 is provided with a slot 101, and the first resonant post 20 and a plurality of second resonant posts 30 are arranged around the slot 101.

[0040] In one embodiment of this application, the passband range is 2530MHz-2670MHz.

[0041] Understandably, everything outside the passband is considered the stopband. The passband of a filter refers to the frequency range within which the filter allows signals to pass. Within this frequency range, the filter's insertion loss is low, and signals can pass through with almost no attenuation. For dielectric waveguide filters, the passband range is usually determined by its design parameters (such as the height and distance of the resonant pillars). The stopband, on the other hand, refers to the frequency range within which the filter suppresses signals. Within this frequency range, the filter's attenuation is significant, and signals are substantially suppressed. The presence of the stopband helps reduce or eliminate the impact of unwanted frequency components on system performance.

[0042] In Embodiment 1 of this application, as Figure 1 As shown, there is one first resonant pillar 20 and four second resonant pillars 30.

[0043] Specifically, four second resonant pillars 30 and one first resonant pillar 20 are arranged in a specific layout inside the filter and interconnected via air or dielectric coupling. The coupling between the resonant pillars is mainly controlled by their distance, but can also be fine-tuned through methods such as slotting. The resonant frequencies of the second resonant pillars 30 are located within the passband and collectively determine the passband characteristics of the filter. By adjusting their resonant frequencies and coupling coefficients, precise control can be achieved over parameters such as passband bandwidth and center frequency. The first resonant pillar 20, acting as a resonator resonating in the low-end stopband, can introduce additional transmission zeros within the stopband, thereby improving the filter's frequency selectivity and out-of-band rejection capability. Although it does not increase the number of in-band reflection zeros, it can significantly improve the filter's performance.

[0044] The dielectric waveguide filter in Example 1 cleverly utilizes the resonant frequency and coupling coefficient of the resonant pillar to achieve the goal of introducing additional transmission zeros without a negative coupling structure, thereby simplifying the design, reducing manufacturing costs, and providing strong suppression capabilities for signals in adjacent frequency bands.

[0045] Furthermore, this first embodiment is a fourth-order dielectric waveguide filter with three transmission zeros within the band. See [link to documentation]. Figure 1 The four second resonant pillars 30 resonate within the passband, while the first resonant pillar 20 is a resonator that resonates in the low-end stopband. Although it does not increase the number of in-band reflection zeros, it can generate an additional transmission zero. The resonant frequency of the multiple second resonant pillars 30 is mainly controlled by the height of the resonant pillars, and the coupling between the second resonant pillars 30 is mainly controlled by the distance between the resonant pillars. Slots can also be made at appropriate positions to reduce the coupling between the resonant pillars, so as to achieve flexible control of the coupling coefficient between the resonant pillars. Figure 1All couplings between the resonant pillars are positive couplings. By controlling the resonant frequency of the first resonant pillar 20, an out-of-band resonant mode is introduced to introduce a low-end transmission zero without negative coupling.

[0046] It should be noted that the near-band normalized low-pass prototype response of this filter contains transmission zeros located at -1.5j, -3j, and 2.5j. This can be understood as j being a complex unit used to represent the location of the transmission zeros in the complex plane; and Figure 1 The structure shown does not have any additional negative coupling structures. The presence of four reflection zeros in the passband indicates that the redundant resonator (i.e., the first resonant pillar 20) does not provide an in-band order; its resonance occurs outside the band, demonstrating the controllability and effectiveness of the redundant resonator design.

[0047] It should be noted that in the far-band normalized low-pass prototype response, the redundant resonance located at the lower frequency position (-10, -6) has a reduced suppression in the far band compared with the traditional dielectric waveguide filter design method, but it still meets the requirements. In addition, the additional near-end transmission zero is more conducive to its performance improvement.

[0048] This first embodiment introduces a low-end, high-suppression transmission zero without the need for additional negative coupling structures, simplifying the design, reducing manufacturing costs, and providing strong suppression of signals in adjacent frequency bands. Simultaneously, the strong coupling resulting from redundant resonances facilitates compact, small-size filter design.

[0049] In Embodiment 2 of this application, as Figure 2 and Figure 3 As shown, there are two first resonant pillars 20 and eight second resonant pillars 30.

[0050] In the second embodiment of this application, one first resonant pillar 20 and four second resonant pillars 30 are located on one side of the slot 101, and another first resonant pillar 20 and another four second resonant pillars 30 are located on the other side of the slot 101. The slot 101 is used to reduce the coupling between the two first resonant pillars 20 and the multiple second resonant pillars 30.

[0051] In the second embodiment of this application, the housing 10 is provided with a plurality of coupling holes 102. A portion of the coupling holes 102 are located between one first resonant post 20 and four second resonant posts 30, and another portion of the coupling holes 102 are located between another first resonant post 20 and another four second resonant posts 30.

[0052] In the second embodiment of this application, a tuning screw is provided on the top of a plurality of second resonant pillars 30, and the tuning screw is used to adjust the self-resonant frequency.

[0053] In the second embodiment of this application, the housing 10 is provided with a coupling diaphragm, which is used to reduce the coupling between the two first resonant pillars 20 and the plurality of second resonant pillars 30.

[0054] Specifically, the second resonant pillars 30 are arranged in a certain layout inside the filter and are interconnected by air or dielectric coupling; the tuning screw is installed on the top of the resonant pillar that needs to be tuned, and the self-resonant frequency of the resonant pillar can be finely adjusted by rotating the screw; the coupling diaphragm is inserted between the resonant pillars that need to reduce coupling, and the coupling amount can be adjusted by changing the thickness, shape or position of the diaphragm; the coupling screw is installed between the resonant pillars that need to finely adjust the coupling amount, and the coupling coefficient can be precisely controlled by rotating the screw. The resonance of the eight second resonant pillars 30, located within the passband, collectively determines the filter's passband characteristics, including center frequency and bandwidth. The resonance of the two first resonant pillars 20, located in the low-end stopband, introduces additional transmission zeros within the stopband, improving the filter's frequency selectivity and out-of-band rejection capability. Tuning screws are used to finely adjust the self-resonant frequencies of the resonant pillars, ensuring that the resonant frequency of each pillar meets design requirements, thereby achieving a precise filter response. Coupling diaphragms are used to reduce coupling between the resonant pillars, enabling a more compact design without increasing the filter's size. Furthermore, by flexibly controlling the coupling amount, the filter's performance can be further optimized. Coupling screws are used to precisely control the coupling coefficients between the resonant pillars, ensuring that the filter has the required frequency response and out-of-band rejection characteristics.

[0055] The dielectric waveguide filter in this second embodiment cleverly utilizes structures such as resonant pillars, tuning screws, coupling diaphragms, and coupling screws to achieve the design of high-order, complex topology microwave filters, and demonstrates the application of multiple blind-hole structures as out-of-band resonators. This not only improves the filter's performance but also simplifies the design process and reduces manufacturing costs.

[0056] Further, see Figure 3This second embodiment is an eighth-order dielectric waveguide filter with six finite transmission zeros and two out-of-band complex reflection zeros. The eight second resonant pillars 30 resonate within the passband, while the two first resonant pillars 20 resonate in the low-end stopband. The resonant frequency of the second resonant pillars 30 is primarily controlled by their height. Tuning screws at the top of the resonant pillars are used for minor adjustments to the self-resonant frequency. The coupling between the resonant pillars is mainly controlled by the distance between them. Coupling diaphragms can be inserted at appropriate positions to reduce coupling between the resonant pillars, thereby reducing the filter size or allowing for independent and flexible control of coupling. Coupling screws between the resonant pillars are used for minor adjustments to the coupling amount; all coupling between the resonant pillars is positive coupling. By increasing the height of the redundant resonators (i.e., the first resonant pillars 20) to resonate below the filter's passband, out-of-band resonant modes are introduced, thereby introducing low-end transmission zeros without negative coupling, which do not provide in-band reflection zeros.

[0057] The resonant frequencies of the two first resonant pillars 20 and the eight second resonant pillars 30 are primarily controlled by the height of the pillars. The coupling between the pillars is mainly controlled by the distance between them. Slots can also be added at appropriate locations to reduce the coupling between the pillars, allowing for flexible control of the coupling coefficient. All coupling between the pillars is positive coupling. By controlling the resonant frequencies of one and another first resonant pillar 20, out-of-band resonant modes are introduced to introduce additional transmission zeros without negative coupling.

[0058] It should be noted that the near-band response of this filter contains four transmission zeros located in the low-end stopband. Figure 2 The structure shown does not have any additional negative coupling. The presence of eight reflection zeros in the passband indicates that the two first resonant pillars 20 (i.e., the two resonators) do not provide in-band order; their resonance occurs out of band, demonstrating the effectiveness and reliability of this dielectric waveguide filter design.

[0059] This embodiment has a complex structure, which fully demonstrates the application of the design method of the present invention in the design of high-order and complex topology microwave filters. It also demonstrates the application of multiple blind hole structures as out-of-band resonators, further illustrating the wide application range of the design method of the present invention.

[0060] Based on the above embodiments, this application also provides a communication device, wherein the communication device includes a dielectric waveguide filter as described in any one of the above solutions.

[0061] The communication device provided in this application has all the above-mentioned beneficial effects because it is equipped with the dielectric waveguide filter described in any of the above technical solutions, which will not be repeated here.

[0062] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0063] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0065] It should be noted that, in this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0066] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A dielectric waveguide filter, characterized in that, The dielectric waveguide filter includes a housing, at least one first resonant pillar, and multiple second resonant pillars; The first resonant post and a plurality of second resonant posts are respectively disposed on the housing. The resonant frequency of the first resonant post is within the stopband range of the filter. The first resonant post is used to introduce additional transmission zeros. The resonant frequencies of the plurality of second resonant posts are within the passband range of the filter. The coupling between the plurality of second resonant posts is positive coupling.

2. The dielectric waveguide filter according to claim 1, characterized in that, The housing is provided with a first power supply port and a second power supply port. The first power supply port is located at the input end of the housing, and the second power supply port is located at the output end of the housing. The first power supply port is used to input microwave signals, and the second power supply port is used to output microwave signals.

3. The dielectric waveguide filter according to claim 1, characterized in that, The housing is provided with a slot, and the first resonant post and a plurality of second resonant posts are arranged around the slot.

4. The dielectric waveguide filter according to claim 1, characterized in that, The passband range is 2530MHz-2670MHz.

5. The dielectric waveguide filter according to any one of claims 1-4, characterized in that, There is one first resonant pillar and four second resonant pillars.

6. The dielectric waveguide filter according to any one of claims 1-4, characterized in that, There are two first resonant pillars and eight second resonant pillars.

7. The dielectric waveguide filter according to claim 6, characterized in that, One first resonant post and four second resonant posts are located on one side of the slot, and another first resonant post and four more second resonant posts are located on the other side of the slot. The slot is used to reduce the coupling between the two first resonant posts and the plurality of second resonant posts.

8. The dielectric waveguide filter according to claim 6, characterized in that, The housing is provided with a plurality of coupling holes. Some of the coupling holes are located between one of the first resonant pillars and four of the second resonant pillars, and other coupling holes are located between another first resonant pillar and another four of the second resonant pillars.

9. The dielectric waveguide filter according to claim 6, characterized in that, A plurality of second resonant pillars are topped with tuning screws, the tuning screws being used to adjust the self-resonant frequency; and / or The housing is provided with a coupling diaphragm, which is used to reduce the coupling between the two first resonant pillars and the plurality of second resonant pillars.

10. A communication device, characterized in that, The communication device includes a dielectric waveguide filter as described in any one of claims 1 to 9.

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