Low-frequency ceramic metal mixed dielectric cavity high-power filter

Abstract

The invention discloses a high-power filter with a low-frequency ceramic metal mixed dielectric cavity, and relates to the technical field of filters, a filter shell is formed by a hollow base and a tuning cover plate, and a plurality of groups of metal resonators are erected in the base; according to the high-power filter with the low-frequency ceramic-metal mixed dielectric cavity, through the tuning cover plate, the metal resonator, the ceramic dielectric sheet and the tuning ceramic dielectric sheet, the cover plate surface is separated to be directly coupled with the metal resonator to prevent breakdown during high power, and high-power tolerance is realized by utilizing the characteristics of non-electric conduction, non-heat conduction and high Q value of ceramic; according to the low-frequency cavity filter, the number of the ceramic dielectric sheets entering the base is increased by rotating the tuning ceramic dielectric sheets, a metal tuning rod is replaced to reduce direct metal coupling and increase power, meanwhile, a Q value can be increased, loss can be reduced to bear higher power tolerance, the high power tolerance of the low-frequency cavity filter is improved, and the material cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of filter technology, specifically to a low-frequency ceramic-metal hybrid dielectric cavity high-power filter. Background Technology

[0002] A filter is a circuit or algorithm used to selectively attenuate or allow specific frequency components of a signal. It is widely used in fields such as communications, audio and video processing, control systems, and instrumentation.

[0003] In military communication frequency bands, the number of coexisting combinations of filters is extremely large. Under low-frequency, high-power operating conditions, in order to prevent arcing caused by excessive power, the resonant column is often lowered as much as possible and the distance from the cavity wall and cover plate is increased, or the volume of the resonant cavity is increased to reduce losses and enhance power tolerance. However, if the distance between the cavity wall and cover plate is too large, it will easily lead to excessively high frequency. If the tuning screw is inserted too deeply into the cavity, it will be difficult to achieve high power requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a low-frequency ceramic-metal hybrid dielectric cavity high-power filter to overcome the shortcomings of the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a low-frequency ceramic-metal hybrid dielectric cavity high-power filter, comprising a filter housing, the filter housing being composed of an internally hollowed-out base and a tuning cover plate, the tuning cover plate being fixedly mounted on the base, and multiple sets of metal resonators being mounted inside the base, each set of metal resonators having a ceramic dielectric sheet welded to its top, the welding surface of the ceramic dielectric sheet being silver-plated, the tuning ceramic dielectric sheet being movably mounted on the tuning cover plate, and the tuning ceramic dielectric sheet being spiral-shaped and passing through the tuning cover plate, the tuning ceramic dielectric sheet maintaining a certain distance from each other.

[0006] Each set of metal resonators has a set of symmetrical sliders fixedly installed on its outer wall. The inner side wall of the base has multiple sets of guide plates fixedly installed. The metal resonators can move up and down along the direction of the guide plates via the sliders. The guide plates have slots. The outer surface of the metal resonators is movably fitted with a collar. The collar can rotate in the slots. The outer surface of the metal resonators has threads. The collar is used in conjunction with the threads. A vertical plate is fixedly installed on the collar. A push plate is fixedly installed at the bottom end of the tuning ceramic dielectric sheet. The push plate is used in conjunction with the vertical plate.

[0007] Multiple sets of outer covers are fixedly installed on the tuning cover plate, and the portion of the tuning ceramic dielectric sheet extending outside the tuning cover plate is placed inside the outer cover.

[0008] The outer cover is made of transparent material, and the outer side of the tuning ceramic medium sheet is provided with scales. The outer cover is also provided with scales, and the scales on the outer cover and the scales on the tuning ceramic medium sheet are used in conjunction with each other.

[0009] Multiple sets of rotating rods are rotatably arranged on the tuning cover plate. The bottom of the rotating rods extends into the base, and the tuning ceramic dielectric sheet is fixedly sleeved on the outer surface of the rotating rods.

[0010] A spring is fixedly mounted on the base, and the metal resonator is mounted on the spring.

[0011] The height of the thread is the same as the height of the tuning ceramic dielectric sheet, and the number of turns of the thread is less than the number of turns of the tuning ceramic dielectric sheet.

[0012] In the above technical solution, the present invention provides a low-frequency ceramic-metal hybrid dielectric cavity high-power filter. Through a tuning cover plate, a metal resonator, a ceramic dielectric sheet, and a tuning ceramic dielectric sheet, the cover plate surface is separated from the metal resonator to prevent breakdown when the power is high. The high power tolerance is achieved by utilizing the non-conductive and non-thermal conductive properties of ceramic and its high Q value. The number of sheets entering the base is increased by rotating the tuning ceramic dielectric sheet to replace the metal tuning rod, thereby reducing direct metal coupling and increasing power. At the same time, the Q value can be increased to reduce losses and withstand higher power tolerance. This increases the high power tolerance of the low-frequency cavity filter and reduces material costs. By using threads, vertical plates, push plates, rotating rods, sliders, limiting plates, slots, and collars, the distance between the tuning ceramic dielectric sheet 6 and the metal resonator 4 is increased to increase the Q value and reduce losses, enabling the filter to achieve higher power tolerance. This further improves the power tolerance of the filter. Combined with increasing the number of tuning ceramic dielectric sheets 6, the power tolerance of the filter can be further improved, ensuring the safe use of the filter under low-frequency, high-power operating conditions. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0014] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure after removing the tuning cover plate, provided in an embodiment of the present invention. Figure 3 A schematic diagram illustrating the structural combination of the tuning cover plate, metal resonator, ceramic dielectric sheet, and tuning ceramic dielectric sheet provided in an embodiment of the present invention; Figure 4 Provided for embodiments of the present invention Figure 3 Enlarged view of the structure at point A in the image; Figure 5 An exploded view of the structure of the tuning cover plate, metal resonator, ceramic dielectric sheet, tuning ceramic dielectric sheet, slider and limiting plate provided in the embodiments of the present invention.

[0015] Explanation of reference numerals in the attached figures: 1. Filter housing; 2. Base; 3. Tuning cover; 4. Metal resonator; 5. Ceramic dielectric sheet; 6. Tuning ceramic dielectric sheet; 7. Slider; 8. Limiting plate; 9. Slot; 10. Collar; 11. Thread; 12. Vertical plate; 13. Push plate; 14. Outer cover; 15. Rotating rod; 16. Spring. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0017] Please see Figure 1-5 This invention provides a low-frequency ceramic-metal hybrid dielectric cavity high-power filter, comprising a filter housing 1, which is composed of an internally hollowed-out base 2 and a tuning cover 3. The tuning cover 3 is fixedly mounted on the base 2, and multiple sets of metal resonators 4 are mounted inside the base 2. Each set of metal resonators 4 has a ceramic dielectric sheet 5 welded to its top, and the welding surface of the ceramic dielectric sheet 5 is silver-plated. A tuning ceramic dielectric sheet 6 is movably mounted on the tuning cover 3, and the tuning ceramic dielectric sheet 6 is spiral-shaped and passes through the tuning cover 3, with a distance maintained between the tuning ceramic dielectric sheet 6 and the ceramic dielectric sheet 5.

[0018] Each set of metal resonators 4 has a set of symmetrical sliders 7 fixedly installed on its outer wall. The inner side wall of the base 2 has multiple sets of guide plates 8 fixedly installed. The metal resonator 4 can move up and down along the direction of the guide plates 8 via the sliders 7. The guide plates 8 have slots 9. The outer surface of the metal resonator 4 is movably fitted with a collar 10. The collar 10 can rotate in the slot 9. The outer surface of the metal resonator 4 has threads 11. The collar 10 and the threads 11 are used together. A vertical plate 12 is fixedly installed on the collar 10. A push plate 13 is fixedly installed at the bottom end of the tuning ceramic dielectric sheet 6. The push plate 13 and the vertical plate 12 are used together.

[0019] When processing low-frequency, high-power signals, a ceramic dielectric sheet 5 is added to the metal resonator 4. When the power is high, the cover plate is separated from the metal resonator 4 and directly coupled to prevent breakdown. The high power tolerance is achieved by utilizing the non-conductive, non-thermal conductive, and high Q-value characteristics of ceramic. In order to ensure the normal use of the filter, the tuning ceramic dielectric sheet 6 can be rotated into the base 2, thereby increasing the number of turns of the tuning ceramic dielectric sheet 6. It can replace the metal tuning rod to reduce direct metal coupling and increase power. At the same time, it can increase the Q-value and reduce losses to withstand higher power tolerance, thereby increasing the high power tolerance of the low-frequency cavity filter and reducing material costs. It should be noted that one side of the ceramic dielectric sheet 5 is silver-plated to facilitate welding with the metal resonator 4. The initial state of the tuning ceramic dielectric sheet 6 extends into the base 2 in a complete circle, at which point the push plate 13 and the vertical plate 12 are in contact with each other.

[0020] according to Figures 1-5 Multiple sets of outer covers 14 are fixedly installed on the tuning cover 3, and the portion of the tuning ceramic dielectric sheet 6 extending to the outside of the tuning cover 3 is placed inside the outer cover 14.

[0021] The outer cover 14 is made of transparent material, and the outer side of the tuning ceramic medium sheet 6 is provided with scale. The scale on the outer cover 14 is used in conjunction with the scale on the tuning ceramic medium sheet 6.

[0022] Multiple sets of rotating rods 15 are rotatably mounted on the tuning cover plate 3. The bottom of the rotating rods 15 extends into the base 2, and the tuning ceramic dielectric sheet 6 is fixedly sleeved on the outer surface of the rotating rods 15.

[0023] A spring is fixedly installed on the base 2, and the metal resonator 4 is mounted on the spring.

[0024] The height of thread 11 is the same as the height of the tuning ceramic dielectric plate 6, and the number of turns of thread 11 is less than the number of turns of the tuning ceramic dielectric plate 6.

[0025] When rotating the tuning ceramic dielectric 6, firstly, the rotating rod 15 is rotated to make the tuning ceramic dielectric 6 rotate, and then the push plate 13 makes the collar 10 rotate. Due to the presence of the limiting plate 8, the collar 10 can only rotate on the horizontal plane. At this time, under the cooperation of the slider 7 and the limiting plate 8, the metal resonator 4 can only move downward. At the same time, because the height of the thread 11 is the same as the height of the tuning ceramic dielectric 6, and the number of turns of the thread 11 is less than the number of turns of the tuning ceramic dielectric 6, the downward height of the metal resonator 4 is greater than the length of the tuning ceramic dielectric 6 entering the base 2. By increasing the distance between the tuning ceramic dielectric 6 and the metal resonator 4, the Q value is increased and the loss is reduced, so that the filter can obtain a higher power tolerance, which further improves the power tolerance of the filter. With the addition of more tuning ceramic dielectric 6, the power tolerance of the filter can be further improved, ensuring the safe use of the filter under low-frequency high-power operating conditions. The outer cover 14 is designed to be transparent in order to make it easier to observe the scale on the side of the tuning ceramic dielectric sheet 6 and the scale on the outer cover 14. The number of ceramic dielectric sheets that are inserted can be determined by the overlap between the scale on the outer cover 14 and the tuning ceramic dielectric sheet 6, so as to more accurately know the increased power tolerance of the filter. It should be noted that the tuning cover 3 and the base 2 are fixedly connected by multiple screws. Similarly, the outer cover 14 also needs to be fixed to the top of the rotating rod 15 by screws so that the outer cover 14 can rotate on the tuning cover 3. Since the tuning ceramic dielectric sheet 6 is ceramic and easily damaged, the function of the outer cover 14 is to protect the tuning ceramic dielectric sheet 6, and the spring is used for support. Furthermore, the way the thread 11 and the collar 10 are used together can be achieved by adding balls to the inner wall of the collar 10, so that the balls roll in the thread 11. The direction of the thread 11 and the spiral design direction of the tuning ceramic dielectric plate 6, so that the metal resonator 4 moves down at the same time as the tuning ceramic dielectric plate 6 rotates down, is the basic implementation method in the mechanical structure, which will not be described in detail here.

[0026] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A low-frequency ceramic-metal hybrid dielectric cavity high-power filter, characterized in that, The filter housing (1) consists of a hollowed-out base (2) and a tuning cover (3). The tuning cover (3) is fixedly mounted on the base (2). Multiple sets of metal resonators (4) are mounted inside the base (2). Each set of metal resonators (4) has a ceramic dielectric sheet (5) welded to its top. The welding surface of the ceramic dielectric sheet (5) is silver-plated. A tuning ceramic dielectric sheet (6) is movably mounted on the tuning cover (3). The tuning ceramic dielectric sheet (6) is spiral and passes through the tuning cover (3). The tuning ceramic dielectric sheet (6) and the ceramic dielectric sheet (5) are kept at a distance.

2. The low-frequency ceramic-metal hybrid dielectric cavity high-power filter according to claim 1, characterized in that, Each set of metal resonators (4) has a set of symmetrical sliders (7) fixedly installed on its outer wall. The inner side wall of the base (2) is fixedly provided with multiple sets of guide plates (8). The metal resonator (4) can move up and down along the direction of the guide plates (8) via the sliders (7). The guide plates (8) have slots (9) provided. The outer surface of the metal resonator (4) is movably fitted with a collar (10). The collar (10) can rotate in the slots (9). The outer surface of the metal resonator (4) has threads (11). The collar (10) is used in conjunction with the threads (11). The collar (10) is fixedly installed with a vertical plate (12). The bottom end of the tuning ceramic dielectric sheet (6) is fixedly installed with a push plate (13). The push plate (13) is used in conjunction with the vertical plate (12).

3. A low-frequency ceramic-metal hybrid dielectric cavity high-power filter according to claim 1, characterized in that, Multiple sets of outer covers (14) are fixedly installed on the tuning cover (3), and the portion of the tuning ceramic dielectric sheet (6) extending to the outside of the tuning cover (3) is placed inside the outer cover (14).

4. A low-frequency ceramic-metal hybrid dielectric cavity high-power filter according to claim 3, characterized in that, The outer cover (14) is made of transparent material, and the outer side of the tuning ceramic medium sheet (6) is provided with a scale. The outer cover (14) is provided with a scale, and the scale on the outer cover (14) and the scale on the tuning ceramic medium sheet (6) are used in conjunction with each other.

5. A low-frequency ceramic-metal hybrid dielectric cavity high-power filter according to claim 1, characterized in that, Multiple sets of rotating rods (15) are rotatably arranged on the tuning cover plate (3). The bottom of the rotating rod (15) extends into the base (2). The tuning ceramic dielectric sheet (6) is fixedly sleeved on the outer surface of the rotating rod (15).

6. A low-frequency ceramic-metal hybrid dielectric cavity high-power filter according to claim 1, characterized in that, A spring is fixedly installed on the base (2), and the metal resonator (4) is mounted on the spring.

7. A low-frequency ceramic-metal hybrid dielectric cavity high-power filter according to claim 2, characterized in that, The height of the thread (11) is the same as the height of the tuning ceramic dielectric sheet (6), and the number of turns of the thread (11) is less than the number of turns of the tuning ceramic dielectric sheet (6).

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