Mixing filter

Abstract

The invention relates to the technical field of filters, and discloses a frequency mixing filter, which comprises a shielding cavity, the upper surface of which is provided with a cover plate; the bottom of the cover plate is provided with a tuning rod. The upper surface of the tuning rod is provided with a fixing assembly. One side of the bottom of the cover plate is provided with a first resonator unit and the surface is provided with a metal sheet, and the other side is uniformly provided with second resonator units. The surface of the connector is provided with a connecting rod medium and an installation assembly. The components of the mixing filter are firmly assembled to ensure the stability and the sealing performance of the whole structure, and the shielding cavity can reduce the influence of external electromagnetic interference on internal signal transmission; the metal sheet optimizes the resonance characteristic of the first resonator unit, the second resonator units which are uniformly distributed enable a signal transmission path to be balanced, and a fine tuning function of the tuning rod is matched, so that resonance parameters can be accurately adjusted, and signal transmission loss and time delay deviation are reduced; the connecting rod medium and the mounting assembly avoid signal distortion caused by loose assembly of the connector, and the port time delay effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of filter technology, specifically to a mixer filter. Background Technology

[0002] Mixer filters are indispensable signal processing components in fields such as communication and electronic equipment. They are mainly used to perform frequency mixing and filtering operations on signals, select effective signals and suppress useless interference signals. Their performance is directly related to the stability and accuracy of signal transmission in electronic equipment.

[0003] Existing mixer filters suffer from numerous structural flaws in their component assembly design. For example, the shielding structure lacks proper sealing, and electromagnetic interference protection is inadequate. The resonator unit placement is untargeted, lacking auxiliary optimization structures, and the tuning components are not securely fixed, limiting fine-tuning accuracy. Furthermore, the connector fixing structure is simplistic, making it difficult to guarantee post-assembly reliability. These structural defects allow external electromagnetic interference to easily penetrate and affect signal transmission during operation. This results in inaccurate resonant parameter adjustment, unbalanced signal transmission paths, and ultimately, significant signal loss, noticeable time delay deviations, and even signal distortion, severely impacting filtering performance and stable equipment operation. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a mixer filter to solve the problems mentioned in the background section, such as limited fine-tuning accuracy; the simple fixing structure of the connector makes it difficult to guarantee the reliability after assembly, resulting in significant signal transmission loss, obvious time delay deviation, and even signal distortion, which seriously affects the filtering effect and the stable operation of the equipment.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a mixer filter, comprising: A shielded cavity, the upper surface of which is fitted with a cover plate; A tuning lever is located at the bottom of the cover plate, and a fixing component is installed on the upper surface of the tuning lever; The first resonator unit is disposed on one side of the bottom of the cover plate, and the second resonator unit is evenly distributed on the other side of the bottom of the cover plate. A metal sheet is mounted on the surface of the first resonator unit. A connector is disposed on the surface of a shielded cavity, a connecting rod medium is mounted on the surface of the connector, and an mounting assembly is mounted on the surface of the connector.

[0006] Preferably, the shielding cavity is an integrated cavity structure, and the interior of the shielding cavity is uniformly provided with metal partition structures, and the internal partitions of the shielding cavity each correspond to a signal channel; The integrated structure, manufactured using a monolithic molding process, not only significantly enhances the overall structural strength and mechanical stability of the filter but also maximizes shielding and sealing, effectively preventing interference signals from complex external electromagnetic environments from entering the cavity. Simultaneously, it structurally isolates different internal signal channels, preventing crosstalk caused by signal coupling and ensuring signal transmission purity. The arrangement of the metal partition structure must strictly match the installation layout and signal transmission path of the first and second resonator units, ensuring that each partition cavity forms an independent electromagnetic shielding space. This further strengthens the independence of each signal channel. Furthermore, the thickness and density of the partition structure must balance structural strength and filtering performance, ensuring stable signal transmission paths and controllable losses within each channel. This structural foundation guarantees the accuracy and reliability of the filtering parameters.

[0007] Preferably, the cover plate is connected to the shielding cavity by screws, and the upper surface of the cover plate is provided with mounting holes that are compatible with the screws; The screw connection method combines the convenience of assembly operations with the robustness of the connection structure. It facilitates rapid assembly during production and provides convenient access for disassembling the cover plate and inspecting core components such as the internal tuning rod, first resonator unit, and second resonator unit during later equipment maintenance. The mounting holes are precisely positioned to avoid the installation areas and movement spaces of internal components, fundamentally eliminating structural interference problems during assembly. Furthermore, the uniform and symmetrical distribution of the mounting holes ensures even force distribution on the contact surface between the cover plate and the shielding cavity when the screws are tightened, guaranteeing a tight fit between the cover plate and the upper surface of the shielding cavity. Combined with the sealing design of the cavity edges, this significantly enhances the sealing performance of the entire filter cavity, effectively reducing the leakage of internal electromagnetic signals while preventing the intrusion of external dust, moisture, and other impurities, thus extending the service life of internal components.

[0008] Preferably, the fixing component is located at the top of the tuning rod, one end of the fixing component is screwed to the upper surface of the tuning rod, and the other end of the fixing component is connected to the upper surface of the cover plate; The screw-fit design between the fixing component and the tuning rod allows for precise adjustment of the tuning rod's installation height. Rotation precisely changes the depth the tuning rod extends into the resonant space, enabling accurate calibration of the filter's resonant frequency and meeting filtering requirements under various operating conditions. The connection between the fixing component and the cover plate is reinforced to ensure sufficient structural strength and vibration resistance, effectively preventing displacement, shaking, or loosening of the tuning rod due to mechanical vibration or environmental disturbances during equipment operation, thus ensuring the stability of the resonant frequency. Furthermore, the fixing component's structural design balances ease of adjustment with reliable fixation. Its ergonomic shape and operation allow operators to quickly adjust and tighten it, while a stable fixation ensures consistent filter parameters over long-term use.

[0009] Preferably, a coupling window is provided between the first resonator unit and the adjacent second resonator unit, and the coupling window is a rectangular structure opened on the adjacent side wall of the resonator unit; The rectangular coupling window serves as the crucial signal coupling channel between the first and second resonator units. Its structure provides a stable coupling path for signal transmission, ensuring signal integrity during the coupling process. The window's placement has been optimized through simulation to precisely match the operating frequency band and resonant characteristics of the resonator units, ensuring the coupling strength accurately meets the filter's design specifications. This guarantees effective signal transmission while preventing excessively strong or weak coupling that could degrade filter performance. The edges of the coupling window are smoothly transitioned, eliminating sharp corners and reducing electromagnetic loss and reflection during signal transmission. This design also avoids stress concentration, preventing a decrease in the structural strength of the resonator units due to the window's placement, thus ensuring the structural stability and performance consistency of the resonator units during long-term use.

[0010] Preferably, the bottom of both the first resonator unit and the second resonator unit is in contact with the inner bottom surface of the shielding cavity; The first and second resonator units are mounted with a fully flush bottom, ensuring tight contact with the bottom surface of the shielding cavity and forming a good grounding loop. This not only enhances the electromagnetic shielding effect of the entire filter but also quickly removes stray electromagnetic signals generated during resonator unit operation, preventing them from interfering with normal signal transmission. Simultaneously, the inner bottom surface of the shielding cavity provides a stable support foundation for the resonator units. This rigid support structure effectively resists vibrations during equipment operation, preventing positional shifts or tilts and ensuring the resonator units maintain precise mounting posture. Furthermore, the contact surfaces undergo a flattening process to ensure a gap-free and protrusion-free fit, further improving signal transmission stability and maintaining consistent mounting heights for multiple resonator units, thus enhancing the uniformity of overall filtering performance.

[0011] Preferably, one end of the connecting rod medium is connected to the signal pin of the connector, and the other end of the connecting rod medium extends into the shielding cavity and is connected to the corresponding first resonator unit and second resonator unit; As a critical connecting component for signal transmission, the connecting rod dielectric is made of rigorously selected materials, requiring excellent insulation properties, low dielectric loss, and reliable mechanical strength. This ensures effective isolation of electromagnetic interference between the signal pins and the shielding cavity, while also guaranteeing low signal loss during transmission and maintaining signal fidelity. The connecting ends of the connecting rod dielectric employ a suitable assembly structure. Through precise positioning and fastening design, a stable connection with the connector signal pins and resonator unit is achieved, preventing poor contact due to long-term use or vibration, thus preventing signal attenuation, interruption, or distortion. Simultaneously, the arrangement path of the connecting rod dielectric within the shielding cavity is optimized to avoid the installation positions and movement space of other internal components, preventing structural interference or electromagnetic coupling with other parts. This minimizes the impact of electromagnetic interference on signal transmission, ensuring the integrity and stability of signal transmission.

[0012] Preferably, the mounting assembly includes a fastening screw and a positioning washer, the positioning washer being sleeved on the outside of the fastening screw and located between the contact surfaces of the connector and the shielding cavity; The positioning gaskets in the mounting assembly are made of a material that combines elasticity and toughness. When fitted over the fastening screws, they form a buffer and pressure-dispersing layer between the contact surfaces of the connector and the shielding cavity. This effectively disperses the localized clamping force applied when the fastening screws are tightened, preventing deformation, scratches, or damage to the connector shell or mounting surface due to pressure concentration, thus protecting the connector's structural integrity and sealing performance. Simultaneously, the positioning gaskets fill tiny gaps between the contact surfaces, enhancing the sealing effect, reducing electromagnetic signal leakage from these gaps, and further improving the electromagnetic shielding performance of the filter. The fastening screws are strictly selected to match the connector's mounting hole specifications and load-bearing requirements, ensuring precise thread fit and a secure connection. Their tightening torque is calibrated to guarantee sufficient connection strength while preventing over-tightening that could damage the connector. This effectively prevents the connector from loosening due to vibration, transportation, or other factors during equipment use, ensuring the continuity and stability of signal transmission.

[0013] Preferably, the bottom of the cover plate is provided with a clearance groove corresponding to the positions of the tuning rod, the first resonator unit, and the second resonator unit, and the size of the clearance groove is adapted to the external dimensions of the corresponding components; The clearance groove at the bottom of the cover plate is precisely designed based on the installation position, outline, and movement space of the internal components. Its purpose is to prevent structural interference between the cover plate and the tuning rod, the first resonator unit, and the second resonator unit during installation, ensuring the cover plate can be smoothly installed and tightly fitted into the shielding cavity. The contour of the clearance groove closely matches the shape of the corresponding component, and the reserved assembly gap has been precisely calculated. This ensures smooth installation and removal of the cover plate while minimizing gap space, preventing electromagnetic signal leakage or external impurities from entering due to excessive gaps. Simultaneously, the location and size of the clearance groove do not affect the overall structural strength of the cover plate. The cover plate maintains sufficient rigidity and stability, ensuring protection for the internal components and effectively preventing external dust, moisture, and impurities from entering the cavity. This provides a good working environment for the internal core components and extends the filter's lifespan.

[0014] Preferably, the upper surface of the cover plate is provided with a through hole for adjusting the tuning rod, the through hole corresponds to the position of the tuning rod, and the inner diameter of the through hole is larger than the outer diameter of the tuning rod; The through-hole on the upper surface of the cover plate provides a convenient external operating window for adjusting the tuning rod. Operators can adjust the height of the tuning rod through the through-hole without removing the cover plate, significantly improving the convenience of debugging and maintenance. The inner diameter of the through-hole is slightly larger than the outer diameter of the tuning rod, providing ample space for vertical movement while preventing electromagnetic signal leakage due to excessive clearance. This design also prevents the tuning rod from shifting or wobbling during adjustment, ensuring precise operation. The edges of the through-hole are smoothed to remove burrs and sharp corners, preventing wear and scratches on the tuning rod surface during adjustment and protecting its structural integrity and performance stability. Furthermore, auxiliary positioning marks or scale markings can be placed around the through-hole to facilitate quick identification of the tuning rod's adjustment position, enabling rapid calibration and precise matching of the resonant frequency.

[0015] Compared with the prior art, the present invention provides a mixer filter with the following advantages: This mixer filter features a shielded cavity and cover plate that are fixedly assembled. The tuning rod is securely mounted to the bottom of the cover plate using a fixing component. The first and second resonator units are respectively arranged on both sides of the bottom of the cover plate, with a metal plate mounted on the surface of the first resonator unit. The connector is fixed to the surface of the shielded cavity using an mounting component and a connecting rod medium. The robust assembly of each component ensures the stability and sealing of the overall structure, while the shielding effect of the shielded cavity reduces the impact of external electromagnetic interference on the internal signal transmission. The metal plate optimizes the resonance characteristics of the first resonator unit, and the evenly distributed second resonator units make the signal transmission path more balanced. Combined with the fine-tuning function of the tuning rod, the resonance parameters can be precisely adjusted, effectively reducing signal loss and time delay deviation during transmission. At the same time, the reliable fixation of the connector by the connecting rod medium and the mounting component avoids signal distortion caused by loose assembly, achieving the effect of port time delay. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the cover plate of the present invention; Figure 3 This is an exploded perspective view of the present invention; Figure 4 This is a schematic diagram of the resonator unit of the present invention; Figure 5 This is a schematic diagram of the connector structure of the present invention.

[0017] In the diagram: 1. Shielding cavity; 2. Cover plate; 3. Tuning rod; 4. Fixing assembly; 5. First resonator unit; 6. Second resonator unit; 7. Metal sheet; 8. Connector; 9. Connecting rod medium; 10. Mounting assembly. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] This invention provides a technical solution, a mixer filter, comprising: Please see Figure 1 Shielding cavity 1, with a cover plate 2 installed on the upper surface of shielding cavity 1; Please see Figure 3 Tuning rod 3 is located at the bottom of cover plate 2, and fixing component 4 is installed on the upper surface of tuning rod 3; Please see Figure 2The first resonator unit 5 is disposed on one side of the bottom of the cover plate 2, and the second resonator units 6 are evenly distributed on the other side of the bottom of the cover plate 2. Please refer to [link / reference]. Figure 4 A metal sheet 7 is mounted on the surface of the first resonator unit 5; Please see Figure 1 Connector 8 is disposed on the surface of shielding cavity 1, please refer to Figure 5 Connector 8 has a connecting rod medium 9 mounted on its surface, and mounting assembly 10 mounted on its surface.

[0020] The shielding cavity 1 and the cover plate 2 are fixedly assembled by screws or welding. The tuning rod 3 is securely installed at the bottom of the cover plate 2 by means of the fixing component 4. The first resonator unit 5 and the second resonator unit 6 are respectively arranged on both sides of the bottom of the cover plate 2, and the surface of the first resonator unit 5 is equipped with a metal plate 7. The connector 8 is fixed to the surface of the shielding cavity 1 by screws or welding through the mounting component 10 and the connecting rod medium 9. The firm assembly of each component not only ensures the stability and sealing of the overall structure, but also reduces the impact of external electromagnetic interference on the internal signal transmission through the shielding effect of the shielding cavity 1. The metal plate 7 can optimize the resonance characteristics of the first resonator unit 5, and the evenly arranged second resonator units 6 can make the signal transmission path more balanced. With the fine-tuning function of the tuning rod 3, the resonance parameters can be precisely adjusted, effectively reducing the loss and time delay deviation in the signal transmission process. At the same time, the reliable fixation of the connector 8 by the connecting rod medium 9 and the mounting component 10 avoids signal distortion caused by loose assembly, and finally achieves the ideal effect of port time delay.

[0021] The shielding cavity 1 is an integrated cavity structure. The interior of the shielding cavity 1 is uniformly equipped with metal partition structures, and the internal partitions of the shielding cavity 1 correspond to one signal channel respectively. The integrated structure, manufactured using a monolithic molding process, not only significantly enhances the overall structural strength and mechanical stability of the filter but also maximizes shielding and sealing performance. This effectively blocks interference signals from complex external electromagnetic environments from entering the cavity. Simultaneously, it structurally isolates different internal signal channels, preventing crosstalk caused by signal coupling and ensuring signal transmission purity. The arrangement of the metal partition structure must strictly match the installation layout and signal transmission path of the first resonator unit 5 and the second resonator unit 6, ensuring that each partition cavity forms an independent electromagnetic shielding space. This further strengthens the independence of each signal channel. Furthermore, the thickness and density of the partition structure must balance structural strength and filtering performance, ensuring stable signal transmission paths and controllable losses within each channel. This structural foundation guarantees the accuracy and reliability of the filtering parameters.

[0022] The cover plate 2 is connected to the shielding cavity 1 by screw connection, and the upper surface of the cover plate 2 is provided with mounting holes that are compatible with screws; The screw connection method combines the convenience of assembly operations with the robustness of the connection structure. It facilitates rapid assembly during production and provides convenient access for disassembling the cover plate 2 and inspecting core components such as the internal tuning rod 3, the first resonator unit 5, and the second resonator unit 6 during later equipment maintenance. The mounting holes are precisely positioned to avoid the installation areas and movement spaces of internal components, fundamentally eliminating structural interference problems during assembly. Furthermore, the uniform and symmetrical distribution of the mounting holes ensures even force distribution on the contact surface between the cover plate 2 and the shielding cavity 1 when the screws are tightened. This ensures that the cover plate 2 fits tightly against the upper surface of the shielding cavity 1. Combined with the sealing design of the cavity edges, this significantly enhances the sealing performance of the entire filter cavity, effectively reducing the leakage of internal electromagnetic signals and preventing the intrusion of external dust, moisture, and other impurities, thus extending the service life of the internal components.

[0023] The fixing component 4 is located at the top of the tuning rod 3. One end of the fixing component 4 is screwed to the upper surface of the tuning rod 3, and the other end of the fixing component 4 is connected to the upper surface of the cover plate 2. The screw-fit design between the fixing component 4 and the tuning rod 3 allows for precise adjustment of the installation height of the tuning rod 3. Rotation precisely changes the depth of the tuning rod 3 within the resonant space, thereby achieving accurate calibration of the filter's resonant frequency and meeting filtering requirements under various operating conditions. The connection between the fixing component 4 and the cover plate 2 is reinforced to ensure sufficient structural strength and vibration resistance, effectively preventing displacement, shaking, or loosening of the tuning rod 3 due to mechanical vibration, environmental disturbances, or other factors during equipment operation, thus ensuring the stability of the resonant frequency. Furthermore, the structural design of the fixing component 4 fully considers both ease of adjustment and reliable fixation. Its shape and operation are ergonomic, allowing operators to quickly complete adjustments and tightening. Once tightened, it provides a stable fixation, ensuring consistent filter parameters over long-term use.

[0024] A coupling window is provided between the first resonator unit 5 and the adjacent second resonator unit 6. The coupling window is a rectangular structure and is provided on the adjacent side wall of the resonator unit. The rectangular coupling window serves as the key channel for signal coupling between the first resonator unit 5 and the second resonator unit 6. Its structure provides a stable coupling path for signal transmission, ensuring signal integrity during the coupling process. The window's opening position has been optimized through simulation to strictly match the operating frequency band and resonant characteristics of the resonator units, ensuring that the coupling strength precisely meets the filter's design specifications. This guarantees effective signal transmission while avoiding excessively strong or weak coupling that could degrade filter performance. The edges of the coupling window are smoothly transitioned, eliminating sharp corners and reducing electromagnetic loss and reflection during signal transmission. This approach also avoids stress concentration, preventing a decrease in the structural strength of the resonator units due to the window's opening, and ensuring the structural stability and performance consistency of the resonator units during long-term use.

[0025] The bottom of both the first resonator unit 5 and the second resonator unit 6 is in contact with the inner bottom surface of the shielding cavity 1. The first resonator unit 5 and the second resonator unit 6 are mounted with a fully fitted bottom, ensuring tight contact with the bottom surface of the shielding cavity 1 and forming a good grounding loop. This not only enhances the electromagnetic shielding effect of the entire filter but also quickly removes stray electromagnetic signals generated during resonator unit operation, preventing stray signals from interfering with normal signal transmission. Simultaneously, the bottom surface of the shielding cavity 1 provides a stable support foundation for the resonator units. This rigid support structure effectively resists vibrations during equipment operation, preventing resonator unit displacement or tilting and ensuring the resonator units maintain precise mounting posture. Furthermore, the contact surface undergoes a flattening process to ensure a gap-free and protrusion-free mating surface, further improving signal transmission stability and maintaining consistent mounting height across multiple resonator units, thus enhancing the uniformity of overall filtering performance.

[0026] One end of the connecting rod medium 9 is connected to the signal pin of the connector 8, and the other end of the connecting rod medium 9 extends into the shielding cavity 1 and is connected to the corresponding first resonator unit 5 and second resonator unit 6. As a key connecting component for signal transmission, the connecting rod medium 9 is made of rigorously selected materials, requiring excellent insulation performance, low dielectric loss, and reliable mechanical strength. This ensures effective isolation of electromagnetic interference between the signal pins and the shielding cavity 1, while also guaranteeing low signal loss during transmission and maintaining signal fidelity. The two ends of the connecting rod medium 9 employ a suitable assembly structure. Through precise positioning and fastening design, a stable connection is achieved with the signal pins of the connector 8 and the resonator unit, preventing poor contact due to long-term use or vibration, thus preventing signal attenuation, interruption, or distortion. Simultaneously, the arrangement path of the connecting rod medium 9 within the shielding cavity 1 is optimized to avoid the installation positions and movement space of other internal components, preventing structural interference or electromagnetic coupling with other components, minimizing the impact of electromagnetic interference on signal transmission, and ensuring the integrity and stability of signal transmission.

[0027] Mounting assembly 10 includes a fastening screw and a positioning washer. The positioning washer is sleeved on the outside of the fastening screw and is located between the contact surfaces of the connector 8 and the shielding cavity 1. The positioning gasket in mounting assembly 10 is made of a material that combines elasticity and toughness. When fitted over the fastening screw, it forms a buffer and pressure-dispersing layer between the contact surfaces of the connector 8 and the shielding cavity 1. This effectively disperses the localized clamping force applied when the fastening screw is tightened, preventing deformation, scratches, or damage to the connector 8's shell or mounting surface due to pressure concentration, thus protecting the structural integrity and sealing performance of the connector 8. Simultaneously, the positioning gasket fills the tiny gaps between the contact surfaces, enhancing the sealing effect, reducing electromagnetic signal leakage from these gaps, and further improving the electromagnetic shielding performance of the filter. The fastening screw is strictly selected to match the mounting hole specifications and load-bearing requirements of the connector 8, ensuring precise thread fit and a secure connection. Its tightening torque is calibrated to guarantee sufficient connection strength while preventing over-tightening that could damage the connector 8. This effectively prevents the connector 8 from loosening due to vibration, transportation, or other factors during equipment use, ensuring the continuity and stability of signal transmission.

[0028] The bottom of the cover plate 2 is provided with clearance grooves corresponding to the positions of the tuning rod 3, the first resonator unit 5, and the second resonator unit 6. The size of the clearance grooves is adapted to the external dimensions of the corresponding components. The clearance groove at the bottom of cover plate 2 is precisely designed based on the installation position, outline, and movement space of the internal components. Its purpose is to prevent structural interference between cover plate 2 and tuning rod 3, first resonator unit 5, and second resonator unit 6 during installation, ensuring that cover plate 2 can be smoothly installed and tightly fitted into shielding cavity 1. The outline of the clearance groove closely matches the shape of the corresponding components, and the reserved assembly gap has been precisely calculated. This ensures smooth installation and removal of cover plate 2 while minimizing gap space, preventing electromagnetic signal leakage or intrusion of external impurities due to excessive gaps. Simultaneously, the location and size design of the clearance groove do not affect the overall structural strength of cover plate 2. Cover plate 2 maintains sufficient rigidity and stability, ensuring protection for internal components and effectively preventing external dust, moisture, and impurities from entering the cavity. This provides a good working environment for the internal core components and extends the filter's service life.

[0029] The upper surface of the cover plate 2 is provided with a through hole for adjusting the tuning rod 3. The through hole corresponds to the position of the tuning rod 3, and the inner diameter of the through hole is larger than the outer diameter of the tuning rod 3. The through-hole on the upper surface of the cover plate 2 provides a convenient external operating window for adjusting the tuning rod 3. Operators can adjust the height of the tuning rod 3 through the through-hole without disassembling the cover plate 2, significantly improving the convenience of debugging and maintenance. The inner diameter of the through-hole is slightly larger than the outer diameter of the tuning rod 3, providing ample space for the up-and-down movement of the tuning rod 3 while preventing electromagnetic signal leakage due to excessive clearance. This size design also prevents the tuning rod 3 from shifting or wobbling during adjustment, ensuring the accuracy of the adjustment operation. The edges of the through-hole are smoothed to remove burrs and sharp corners, preventing wear and scratches on the surface of the tuning rod 3 during adjustment and protecting the structural integrity and performance stability of the tuning rod 3. Furthermore, auxiliary positioning marks or scale markings can be set around the through-hole to facilitate quick identification of the adjustment position of the tuning rod 3 by the operator, enabling rapid calibration and precise matching of the resonant frequency.

[0030] This design includes: a cover plate 2 installed on the upper surface of the shielding cavity 1 to provide basic support and shielding environment for its internal structure; a tuning rod 3 located at the bottom of the cover plate 2, with a fixing component 4 installed on its upper surface; the filter characteristics can be changed by adjusting the tuning rod 3, and the fixing component 4 ensures its stable position; a first resonator unit 5 and a second resonator unit 6 are respectively located on both sides of the bottom of the cover plate 2; a metal sheet 7 is installed on the surface of the first resonator unit 5; different resonator units work together, and the metal sheet 7 can optimize the resonance performance; a connector 8 is located on the surface of the shielding cavity 1, with a connecting rod medium 9 and a mounting component 10 installed on it; the connector 8 is used for signal input and output, the connecting rod medium 9 ensures the signal transmission quality, and the mounting component 10 ensures the stable installation of the connector 8; all these structures work together to achieve the mixing and filtering function.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mixer filter, characterized in that, include: A shielding cavity (1) is provided with a cover plate (2) on its upper surface. A tuning rod (3) is located at the bottom of the cover plate (2), and a fixing component (4) is installed on the upper surface of the tuning rod (3). The first resonator unit (5) is disposed on one side of the bottom of the cover plate (2), and the second resonator unit (6) is evenly distributed on the other side of the bottom of the cover plate (2). A metal sheet (7) is installed on the surface of the first resonator unit (5). A connector (8) is disposed on the surface of the shielding cavity (1), a connecting rod medium (9) is mounted on the surface of the connector (8), and an installation assembly (10) is mounted on the surface of the connector (8).

2. A mixer filter according to claim 1, characterized in that: The shielding cavity (1) is an integrated cavity structure. The interior of the shielding cavity (1) is uniformly provided with metal partition structures, and the internal partitions of the shielding cavity (1) correspond to a signal channel respectively.

3. A mixer filter according to claim 1, characterized in that: The cover plate (2) is connected to the shielding cavity (1) by screw connection, and the upper surface of the cover plate (2) is provided with mounting holes that are compatible with screws.

4. A mixer filter according to claim 1, characterized in that: The fixing component (4) is located at the top of the tuning rod (3). One end of the fixing component (4) is screwed to the upper surface of the tuning rod (3), and the other end of the fixing component (4) is connected to the upper surface of the cover plate (2).

5. A mixer filter according to claim 1, characterized in that: A coupling window is provided between the first resonator unit (5) and the adjacent second resonator unit (6). The coupling window is a rectangular structure and is provided on the side wall adjacent to the resonator unit.

6. A mixer filter according to claim 1, characterized in that: The bottom of the first resonator unit (5) and the second resonator unit (6) are in contact with the inner bottom surface of the shielding cavity (1).

7. A mixer filter according to claim 1, characterized in that: One end of the connecting rod medium (9) is connected to the signal pin of the connector (8), and the other end of the connecting rod medium (9) extends into the shield cavity (1) and is connected to the corresponding first resonator unit (5) and second resonator unit (6).

8. A mixer filter according to claim 1, characterized in that: The mounting assembly (10) includes a fastening screw and a positioning washer, the positioning washer being fitted over the outside of the fastening screw and located between the contact surfaces of the connector (8) and the shielding cavity (1).

9. A mixer filter according to claim 1, characterized in that: The bottom of the cover plate (2) is provided with clearance grooves corresponding to the positions of the tuning rod (3), the first resonator unit (5), and the second resonator unit (6), and the size of the clearance grooves is adapted to the external dimensions of the corresponding components.

10. A mixer filter according to claim 1, characterized in that: The upper surface of the cover plate (2) is provided with a through hole for adjusting the tuning rod (3). The through hole corresponds to the position of the tuning rod (3), and the inner diameter of the through hole is larger than the outer diameter of the tuning rod (3).

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