Screw-adjustment-free filter single-cavity device

Abstract

The utility model relates to a screw-adjustment-free filter single-cavity device which comprises a fixing column, a frequency resonator and a resonant cavity formed by a resonant cavity cover plate and a resonant cavity body, the fixing column and the frequency resonator are integrally formed, and the outer side wall of one end, connected with the resonant cavity body, of the fixing column is provided with locking screw teeth. The fixing column is fixed in the resonant cavity through the locking threads. A hexagonal cooperation hole is concavely formed in the lower end portion of the fixing column and penetrates through the bottom end face of the resonant cavity. The bottom of the resonant cavity is provided with a mounting hole corresponding to the fixing column, and a thread engaged with the locking thread is arranged in the mounting hole. Limiting bosses are arranged in the mounting holes in a protruding mode towards the interior of the resonant cavity, the mounting holes penetrate through the limiting bosses, and the lower ends of the fixing columns penetrate through the limiting bosses to be connected into the mounting holes in a screwed mode. The resonant cavity cover plate and the resonant cavity body are fixed through screws or in a welding mode. The resonant cavity can be formed by integral punch forming or 3D printing forming. The filter is simple in structure and convenient to install, and the working efficiency and stability of the filter can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of filters, specifically to a single-cavity device for a screwless filter. Background Technology

[0002] Filters are key components in wireless communication systems, used to select specific frequency signals and suppress other frequency signals. Their performance directly affects the quality of the communication system. With the rapid development of modern communication technologies, the demand for miniaturized, high-performance, and low-cost filters is increasing.

[0003] Currently, cavity filters are widely used in the communication field due to their excellent electrical performance and reliability. Traditional cavity filters typically include components such as a resonant cavity, a resonant post (or resonant rod), a cover plate, and a tuning device. CN114006138A discloses a cavity filter and a self-locking tuning screw for the cavity filter. The tuning screw of this filter includes a threaded portion that is recessed from top to bottom. The outer wall of the threaded portion is threaded, and the upper surface of the threaded portion has a recessed structure. A through groove is provided on the outer peripheral sidewall of the recessed structure.

[0004] CN103650237B discloses a filter tuning device and filter, including a resonant cavity, a cover, and a resonant rod. The bottom of the resonant cavity is provided with a through hole, and the resonant rod passes through the through hole from the resonant cavity. The cover covers the resonant cavity, and the resonant rod can move through the through hole in a direction perpendicular to the bottom of the resonant cavity to adjust the resonant frequency of the filter.

[0005] CN105280994A provides a TM mode dielectric filter, including a resonant cavity, a dielectric resonator, a base, a tuning cover, and a tuning stud. The base is fixed to the bottom of the cavity, and the upper end face of the base is fixedly connected to the lower end face of the dielectric resonator to form an integral unit. The tuning cover is fixed to the upper end face of the resonant cavity, and the tuning stud is installed on the tuning cover through a lock nut and a threaded hole.

[0006] CN212011206U discloses a filter including a resonant cavity, a resonant post, a cover plate, a tuning screw, and multiple pads. The resonant cavity is provided on the resonant cavity, the resonant post is installed in the resonant cavity and located inside the resonant cavity, the cover plate is installed in the resonant cavity and seals the opening, and the tuning screw is screwed to the cover plate, with the head of the tuning screw extending into the resonant cavity.

[0007] CN106169637A discloses a coaxial cavity filter, including a modular single cavity, a resonant rod, a cover plate, a tuning screw, a coupling screw, and a filter connector. The cover plate has a groove, and the upper end of the modular single cavity is fixed in the groove of the cover plate, forming a resonant cavity by sealing with the cover plate. The resonant rod is set at the bottom of the modular single cavity. The tuning screw and the coupling screw are both set on the cover plate and partially extend into the resonant cavity.

[0008] However, existing single-cavity structures for frequency resonators have the following technical problems:

[0009] First, the inconsistent height of the cavity base in traditional filters leads to high processing difficulty and makes it hard to guarantee manufacturing precision. Especially when mass production is required, the inconsistency in the cavity base height results in poor product consistency and affects the overall performance of the filter.

[0010] Secondly, existing filters generally use multiple tuning screws, which not only increases the variety of product materials but also raises assembly requirements. At the same time, the cavity cover needs to accommodate multiple screw holes, increasing design and manufacturing complexity and potentially affecting the filter's intermodulation performance.

[0011] Third, the complex structure of existing filters results in large size and heavy weight, hindering the miniaturization and lightweighting of communication equipment. These problems lead to high manufacturing costs and low production efficiency for existing filters, becoming a major obstacle to the miniaturization of wireless communication products.

[0012] Therefore, there is an urgent need to develop a single-cavity filter device that is simple in structure, small in size, light in weight, easy to manufacture, and has stable performance, in order to meet the needs of modern communication systems for high-performance, miniaturized filters. Utility Model Content

[0013] The technical problem to be solved by this utility model is to address the shortcomings of existing single-cavity frequency resonator structures, such as inconsistent cavity base height leading to high processing difficulty, excessive use of adjusting screws resulting in a wide variety of product materials and high assembly requirements, difficulty in arranging cavity cover plate screws affecting intermodulation performance, and large product size and weight. This invention provides a single-cavity filter device without adjusting screws, so as to achieve the purpose of simplifying the structure, reducing the size and lowering the cost.

[0014] The purpose of this utility model is achieved through the following technical solution: a single-cavity device for a screwless filter, comprising a fixed post, a frequency resonator, and a resonant cavity composed of a resonant cavity cover plate and a resonant cavity body. The fixed post and the frequency resonator are integrally formed. A locking thread is provided on the outer side wall of the end of the fixed post that is connected to the resonant cavity body. The fixed post is fixed in the resonant cavity by the locking thread.

[0015] Furthermore, the lower end of the fixing post is recessed with a hexagonal cooperating hole, and the lower end of the fixing post penetrates the bottom end face of the resonant cavity.

[0016] Furthermore, the bottom of the resonant cavity is provided with a mounting hole corresponding to the fixing post, and the mounting hole is provided with a thread corresponding to the locking screw.

[0017] Furthermore, a limiting boss protrudes into the resonant cavity at the mounting hole, the mounting hole passes through the limiting boss, and the lower end of the fixing post passes through the limiting boss and is screwed into the mounting hole.

[0018] Furthermore, the resonant cavity cover plate and the resonant cavity body are fixed together by screws or welding.

[0019] Furthermore, the resonant cavity is integrally stamped or 3D printed.

[0020] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model simplifies the assembly process and reduces the difficulty of cavity processing and cover plate screw arrangement by integrally molding the fixing column and frequency resonator and fixing them in the resonant cavity with locking threads; the hexagonal cooperating hole recessed at the lower end of the fixing column can easily adjust the distance between the frequency resonator and the resonant cavity cover plate to generate a sufficiently large capacitance and form the required resonant frequency, effectively replacing the original method of using tuning screws; the resonant cavity is integrally stamped or 3D printed, which solves the problem of inconsistent cavity base height and reduces processing difficulty; the overall structural design realizes the miniaturization and lightweighting of the product, reduces the structural volume and weight, and reduces costs, meeting the requirements of modern wireless communication products for miniaturization and lightweighting. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of a single-cavity structure of a conventional frequency resonator;

[0022] Figure 2 This is a three-dimensional structural diagram of the single-cavity device of the screwless filter of this utility model;

[0023] Figure 3 This is a cross-sectional view of the single-cavity device of the screwless filter of this utility model;

[0024] Figure 4 This is an exploded view of the single-cavity device of the screwless filter of this utility model.

[0025] The attached diagram is labeled as follows: 1-fixed post, 11-locking thread, 12-hexagonal cooperating hole, 2-frequency resonator, 3-resonant cavity cover plate, 4-resonant cavity body, 41-mounting hole, 42-limiting boss, 5-resonant cavity. Detailed Implementation

[0026] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0027] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or indirectly on that other component.

[0028] When a component is said to be "connected to" another component, it can be directly connected to the other component or indirectly connected to that other component.

[0029] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0030] 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 with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0031] In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically defined. Example 1

[0032] See Figure 1-4 A single-cavity device for a screwless filter includes a fixed post 1, a frequency resonator 2, and a resonant cavity 5 composed of a resonant cavity cover plate 3 and a resonant cavity body 4. The fixed post 1 and the frequency resonator 2 are integrally formed. The outer side wall of the end of the fixed post 1 that connects to the resonant cavity body 4 is provided with locking threads 11, and the fixed post 1 is fixed in the resonant cavity 5 by the locking threads 11.

[0033] Specifically, the resonant cavity 5 is composed of a resonant cavity cover plate 3 and a resonant cavity body 4. The resonant cavity cover plate 3 covers the top of the resonant cavity body 4, forming a closed space. The resonant cavity body 4 is made of metal and has good electromagnetic shielding performance, which can effectively prevent interference from external electromagnetic signals. The internal dimensions of the resonant cavity body 4 are designed to meet the requirements of the filter's operating frequency.

[0034] The frequency resonator 2 is integrally formed with the fixed column 1, and is located at the upper end of the fixed column 1, having a cylindrical structure. The diameter and height of the frequency resonator 2 are precisely designed according to the operating frequency of the filter to ensure that the filter can operate effectively within the target frequency range. The surface of the frequency resonator 2 is precision-machined with a high degree of smoothness to ensure that the transmission loss of electromagnetic waves on its surface is minimized.

[0035] The fixing post 1 has a cylindrical structure, and a locking thread 11 is provided on the end of its outer wall near the resonant cavity 4. The design of the locking thread 11 ensures that the fixing post 1 can be firmly fixed in the resonant cavity 5 and will not loosen due to external vibration or temperature changes. The pitch and depth of the locking thread 11 are precisely calculated to ensure that the fixing post 1 can be accurately positioned during installation and will not damage the resonant cavity 4 due to over-tightening.

[0036] The lower end of the fixing post 1 is recessed with a hexagonal cooperating hole 12. The design of this hexagonal cooperating hole 12 allows for the use of a hexagonal wrench when installing or removing the fixing post 1, improving the convenience and efficiency of the operation. The depth of the hexagonal cooperating hole 12 is moderate, ensuring that the hexagonal wrench has sufficient contact area without affecting the overall strength of the fixing post 1.

[0037] The lower end of the fixing post 1 penetrates the bottom surface of the resonant cavity 4. This design allows the fixing post 1 to be installed and adjusted from outside the resonant cavity 4 without opening the resonant cavity cover plate 3, simplifying the installation and maintenance process.

[0038] The bottom of the resonant cavity 4 is provided with a mounting hole 41 corresponding to the fixing post 1, and the mounting hole 41 is provided with a thread that meshes with the locking thread 11. The diameter of the mounting hole 41 matches the outer diameter of the fixing post 1, ensuring that the fixing post 1 can be accurately inserted into the mounting hole 41. The thread in the mounting hole 41 matches the locking thread 11 on the outer wall of the fixing post 1, ensuring that the two can be tightly engaged and provide a stable fixing effect.

[0039] A limiting boss 42 protrudes into the resonant cavity 5 at the mounting hole 41, and the mounting hole 41 passes through the limiting boss 42. The lower end of the fixing post 1 passes through the limiting boss 42 and is screwed into the mounting hole 41. The design of the limiting boss 42 increases the contact area between the fixing post 1 and the resonant cavity 4, improving the stability of the connection. The height of the limiting boss 42 is precisely designed to ensure that after the fixing post 1 is installed, the frequency resonator 2 is located in the ideal position within the resonant cavity 5 to obtain the best filtering effect.

[0040] The resonant cavity cover plate 3 and the resonant cavity body 4 are fixed together by screws. The screws are evenly distributed along the edge of the resonant cavity cover plate 3 to ensure a tight fit between the resonant cavity cover plate 3 and the resonant cavity body 4, preventing electromagnetic wave leakage. The number and position of the screws are optimized to ensure sufficient sealing without increasing assembly difficulty due to an excessive number of screws.

[0041] The resonant cavity 4 is integrally stamped, a manufacturing method that ensures dimensional accuracy and surface quality, reducing performance fluctuations caused by manufacturing errors. The stamped resonant cavity 4 exhibits good consistency, which is beneficial for mass production and quality control.

[0042] In this embodiment, the working principle of the screwless single-cavity filter device is as follows: after the electromagnetic wave signal enters the resonant cavity 5, the frequency resonator 2 will resonate with the signal of a specific frequency, allowing the signal of the target frequency to pass through the filter, while signals of other frequencies are attenuated. Since the fixing post 1 and the frequency resonator 2 are integrally formed and fixed in a precise position within the resonant cavity 5 by the locking screw 11, there is no need to adjust the screw later to change the position of the frequency resonator 2, thus achieving the "screwless" feature and improving the stability and consistency of the filter.

[0043] The advantages of this single-cavity, screwless filter device are: simple structure, convenient installation, no need for frequent adjustments, good stability, and suitability for various electronic devices requiring high-precision filtering. The use of an integrated fixed post 1 and frequency resonator 2 reduces assembly errors and improves the filter's performance consistency. Meanwhile, the design of the hexagonal cooperating hole 12 makes installation and disassembly more convenient, and the design of the limiting boss 42 enhances connection stability. These designs effectively improve the overall performance and service life of the filter. Example 2

[0044] A single-cavity device for a screwless filter includes a fixed post 1, a frequency resonator 2, and a resonant cavity 5 composed of a resonant cavity cover plate 3 and a resonant cavity body 4. The fixed post 1 and the frequency resonator 2 are integrally formed. The outer side wall of the end of the fixed post 1 that connects to the resonant cavity body 4 is provided with locking threads 11, and the fixed post 1 is fixed in the resonant cavity 5 by the locking threads 11.

[0045] The difference between this embodiment and Embodiment 1 is that the resonant cavity cover plate 3 and the resonant cavity body 4 are fixed by welding instead of screws. Welding provides better sealing and mechanical strength, and is particularly suitable for applications requiring long-term stable operation and not frequent opening and maintenance. Laser welding technology is used, resulting in uniform welds with high strength, and the welding process will not cause deformation that affects the internal dimensions of the resonant cavity 5.

[0046] The resonant cavity 4 is formed using 3D printing, rather than a single stamping process. 3D printing technology enables more complex structural designs, especially for the internally complex resonant cavity 4, where a single step of printing reduces assembly steps and improves overall precision. The 3D printing utilizes selective laser melting (SLM) technology with aluminum alloy as the printing material, which possesses excellent electrical conductivity and mechanical strength. The surface of the 3D-printed resonant cavity 4 undergoes post-processing to ensure a surface finish that meets the requirements for high-frequency electromagnetic wave conduction.

[0047] In this embodiment, the lower end of the fixing post 1 is also recessed with a hexagonal cooperating hole 12, and the lower end of the fixing post 1 penetrates the bottom end face of the resonant cavity 4. The bottom of the resonant cavity 4 is provided with a mounting hole 41 corresponding to the fixing post 1, and the mounting hole 41 is provided with a threaded engagement corresponding to the locking screw thread 11. A limiting boss 42 protrudes into the resonant cavity 5 at the mounting hole 41, and the mounting hole 41 penetrates the limiting boss 42. The lower end of the fixing post 1 is screwed into the mounting hole 41 through the limiting boss 42.

[0048] This structural design gives the single-cavity, screwless filter device greater integrity and sealing, making it particularly suitable for applications in harsh environments, such as outdoor communication equipment and aerospace equipment. The application of 3D printing technology also makes the design of the resonant cavity 4 more flexible, allowing for rapid design adjustments and manufacturing based on different frequency requirements, thus shortening the product development cycle. Example 3

[0049] A single-cavity device for a screwless filter includes a fixed post 1, a frequency resonator 2, and a resonant cavity 5 composed of a resonant cavity cover plate 3 and a resonant cavity body 4. The fixed post 1 and the frequency resonator 2 are integrally formed. The outer side wall of the end of the fixed post 1 that connects to the resonant cavity body 4 is provided with locking threads 11, and the fixed post 1 is fixed in the resonant cavity 5 by the locking threads 11.

[0050] In this embodiment, the resonant cavity 4 is made of copper, which has better conductivity and thermal stability than aluminum, and can exhibit better performance in high-power applications. The inner surface of the resonant cavity 4 is treated with a silver plating layer, which further improves the transmission efficiency of electromagnetic waves on the inner surface of the cavity and reduces transmission loss.

[0051] The frequency resonator 2 and the fixing post 1 are integrally molded from titanium alloy. Titanium alloy has good mechanical strength and temperature stability, and can maintain stable dimensions in environments with large temperature variations, ensuring that the filter performance is not affected by temperature. The surface of the frequency resonator 2 is also plated with a silver layer to improve electromagnetic wave transmission efficiency.

[0052] The locking thread 11 of the fixing post 1 adopts a trapezoidal thread design. Compared with the ordinary triangular thread, the trapezoidal thread has a larger contact area and better load-bearing capacity, which can provide a more stable fixing effect and is not easy to loosen due to vibration or temperature changes.

[0053] A specially designed metal gasket is used to seal the resonant cavity cover plate 3 and the resonant cavity body 4, and it is fixed with screws. The metal gasket is made of beryllium copper, which has good elasticity and conductivity, and can ensure good sealing and electromagnetic shielding of the resonant cavity 5.

[0054] The lower end of the fixing post 1 is recessed with a hexagonal cooperating hole 12, and the lower end of the fixing post 1 penetrates the bottom end face of the resonant cavity 4. The bottom of the resonant cavity 4 is provided with a mounting hole 41 corresponding to the fixing post 1, and the mounting hole 41 is provided with a threaded engagement corresponding to the locking screw thread 11. A limiting boss 42 protrudes into the resonant cavity 5 at the mounting hole 41, and the mounting hole 41 passes through the limiting boss 42. The lower end of the fixing post 1 passes through the limiting boss 42 and is screwed into the mounting hole 41.

[0055] The single-cavity, screwless filter device of this embodiment is particularly suitable for high-frequency, high-power applications such as satellite communications and radar systems. The selection of high-quality materials and precise structural design ensure the stability and reliability of the filter in harsh environments, extending the service life of the equipment.

[0056] It should be noted that Embodiment 1, Embodiment 2, and Embodiment 3 are all types of single-cavity devices for screwless filters.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tuning-free spiral filter single cavity device, characterized by: It includes a fixed post, a frequency resonator, and a resonant cavity consisting of a resonant cavity cover plate and a resonant cavity body. The fixed post and the frequency resonator are integrally formed. The outer side wall of the end of the fixed post that connects to the resonant cavity body is provided with locking threads. The fixed post is fixed in the resonant cavity by locking threads.

2. A tuning-free cavity filter device according to claim 1, characterized in that: The lower end of the fixing post is recessed with a hexagonal cooperating hole, and the lower end of the fixing post penetrates the bottom end face of the resonant cavity.

3. A tuning-free cavity filter device according to claim 1, wherein: The bottom of the resonant cavity is provided with a mounting hole corresponding to the fixing post, and the mounting hole is provided with a thread corresponding to the locking screw.

4. A tuning-free cavity filter device according to claim 3, characterized in that: A limiting boss protrudes into the resonant cavity at the mounting hole, and the mounting hole passes through the limiting boss. The lower end of the fixing post passes through the limiting boss and is screwed into the mounting hole.

5. A tuning-free cavity filter device according to claim 1, wherein: The resonant cavity cover and the resonant cavity body are fixed together by screws or welding.

6. A tuning-free filter single cavity device according to claim 1, characterized in that: The resonant cavity is integrally stamped or 3D printed.

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