An adjustable tile assembly and a tuning filter

Abstract

The present application relates to the technical field of filter, especially to a kind of adjustable moving blade assembly and tuning filter, including at least two groups of mutually spaced adjustable moving blades, each group of adjustable moving blade has at least two radius different sector metal sheets, each sector metal sheet has discrete distribution metal sheet monomer.The adjustable moving blade is opposite to static blade in initial state, in the resonant cavity of fixed size, for ordinary integrity moving blade, the opposite distance between it and static blade is completely fixed, the working frequency of filter only depends on the opposite area between moving blade and static blade, and the tuning range is limited.The adjustable moving blade described above is spliced by multiple discrete sector metal sheets, not connected each other, each metal sheet monomer can be individually moved by tweezers or flat-nose pliers, so that the opposite distance between it and static blade is variable, the capacitance of resonant cavity can be finely adjusted by adjusting the distance between metal sheet monomer and static blade, so that the resonant frequency of resonant cavity can be accurately changed.

Description

An adjustable chip assembly and a tuned filter Technical Field

[0001] This invention relates to the field of filter technology, and more particularly to an adjustable chip assembly and a tuned filter. Background Technology

[0002] A filter's function is to allow signals of a specific frequency to pass through while attenuating signals of other frequencies. Some filters, multiplexers, or combiners require high power capacity, high Q value, low loss, and a wide tuning range. The frequency tuning of a coaxial cavity tunable filter is achieved by adjusting a variable equivalent capacitance or equivalent inductance within the resonant cavity. To achieve a multi-octave tuning range, the equivalent capacitance or equivalent inductance within the filter's resonant cavity needs to vary over a wide range. Traditionally, this is done by altering the area of ​​the opposing movable and stationary plates to change the equivalent capacitance of the coaxial cavity, thereby changing the resonant frequency.

[0003] The existing moving plate assembly, as shown in Figures 1 and 2, consists of a moving plate 1, a drive shaft 3, and a fixed ring 2. The moving plate is a metal structure with a smoothly varying radius on one side. The entire moving plate is fixed to the drive shaft and rotates under its drive. The distribution of the moving plate assembly and the stationary plate 4 is shown in Figure 3, referring to the parallel plate capacitance formula. The effective capacitance C constructed when the moving and stationary plates are placed facing each other is approximately: Where S 有效 S is the effective facing area when the moving and stationary plates are equivalent to a parallel plate structure, and d is the distance between the moving and stationary plates. As the drive shaft rotates, the larger radius portion of the moving plate moves between the stationary plates, S... 有效 If the value increases, the effective capacitance C increases. This is determined by the resonant frequency formula. When the effective capacitance C increases, the resonant frequency f0 of the resonant cavity decreases, meaning the filter is tuned to a lower frequency, and vice versa. However, in traditional coaxial cavity tunable filters, the single moving plate is a solid piece of metal. In specific examples, this leads to the following problems:

[0004] a. The capacitance change caused by the moving plate is far from sufficient to make the filter tunable across multiple octaves. The upper and lower limits of the frequency tuning range of a traditional coaxial cavity tunable filter differ by less than one octave. For example, if the tuning range is 110MHz to 172MHz, the frequency band is... Or 230MHz to 420MHz, that is, the frequency band is

[0005] b. If you want to widen the tuning range by forcibly increasing the maximum radius of the moving plate, you will soon be limited by the cavity volume. Increasing the cavity volume will change the ratio of the cavity side length to the diameter of the resonant rod. Usually, this value is around 2.3, which is not conducive to filter design. At the same time, increasing the volume is not conducive to engineering applications.

[0006] c. The moving piece is a single metal sheet, which leaves very little room for adjustment after the physical part is formed. The distance between several moving pieces in a single moving piece assembly may be inconsistent during processing. The deviation between the moving and stationary pieces requires high precision, which is difficult to do manually and results in poor product consistency. Therefore, production and debugging are difficult, and the actual test curves often differ from the simulation results. If changes are needed, reprocessing is required, which is costly and inefficient.

[0007] d. The moving plate is a solid material with a very small gap between it and the stationary plate, making it highly susceptible to environmental factors. The filter's performance curve is overly sensitive to changes in environmental factors (temperature, vibration, humidity, etc.) and internal structural stress. The performance curves differ greatly before and after high-temperature and low-temperature tests, and permanent, irreversible damage can easily occur. It can only be restored by disassembling and professionally adjusting and repairing it again. Therefore, it has poor environmental adaptability.

[0008] e. Within a multi-octave operating frequency band, multiple filters are often required to switch between operating conditions, which increases the number of filters used and introduces additional RF devices such as RF switches, resulting in high cost and poor integration. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide an adjustable chip assembly and a tuned filter to overcome the above-mentioned technical problems.

[0010] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0011] An adjustable sheet assembly includes at least two sets of adjustable sheets arranged at intervals from each other, each set of adjustable sheets having at least two fan-shaped metal sheets with different radii, each fan-shaped metal sheet having discretely distributed metal sheet units.

[0012] Furthermore, the fan-shaped metal sheet is provided with multiple strip-shaped grooves extending towards the center along its arc length to form discretely distributed metal sheet units.

[0013] Furthermore, the same sector-shaped metal sheet has individual metal sheets with corresponding different central angles.

[0014] Furthermore, a movable plate washer and a movable plate pad are sleeved on the movable plate shaft; the movable plate pad is sleeved on the movable plate shaft and located between two adjacent sets of adjustable movable plates, each set of adjustable movable plates consists of two movable plates arranged at intervals, and the movable plate washer is sleeved on the movable plate shaft and located between two adjacent movable plates.

[0015] Furthermore, the thickness of the moving plate washer is 1 mm; the thickness of the moving plate pad is 3.4 mm.

[0016] Furthermore, the number of adjustable pieces is four sets.

[0017] Furthermore, the maximum radius of the fan-shaped metal sheet is 38 mm, and the minimum radius of the fan-shaped metal sheet is 22 mm.

[0018] A tuned filter includes a metal housing and a fixed ring, a moving plate shaft, and a stationary plate respectively disposed inside the metal housing. The fixed ring is sleeved on the moving plate shaft. The metal housing also provides an adjustable plate assembly, which is installed on the outer circumferential ring wall of the fixed ring. The adjustable plate and the stationary plate are arranged in a one-to-one correspondence.

[0019] Furthermore, the stationary plate has a groove for the adjustable plate to pass through, and the direct distance between the stationary plate and the adjustable plate is 0.7mm.

[0020] Furthermore, the groove width of the stationary plate is 3.4 mm.

[0021] The beneficial effects of this invention are as follows:

[0022] This invention provides an adjustable plate assembly, comprising at least two sets of adjustable plates spaced apart from each other. Each set of adjustable plates has at least two fan-shaped metal plates with different radii, and each fan-shaped metal plate has discretely distributed individual metal plates. In use, the adjustable plate initially faces the stationary plate. In a resonant cavity of fixed size, for a typical integral adjustable plate, the facing distance between it and the stationary plate is completely fixed, and the operating frequency of the filter depends only on the facing area between the adjustable plate and the stationary plate, resulting in a limited tuning range. However, the aforementioned adjustable plate is composed of multiple discrete fan-shaped metal plates, which are not connected to each other. Each individual metal plate can be individually manipulated using tweezers or needle-nose pliers to change its facing distance with the stationary plate. By adjusting the distance between the individual metal plates and the stationary plate, the capacitance of the resonant cavity can be finely adjusted, thereby precisely changing the resonant frequency of the resonant cavity. Furthermore, by using discrete sector-shaped metal plates, the area facing the stationary plate is maximized when the radius is at its maximum, resulting in a large capacitance and a low resonant frequency. Bringing the sector-shaped metal plates closer to the stationary plate significantly increases the capacitance, leading to an even larger capacitance and a lower resonant frequency. Conversely, when the sector-shaped metal plate radius is at its minimum, the area facing the stationary plate is minimized, resulting in a small capacitance and a high resonant frequency. Moving the sector-shaped metal plates further away from the stationary plate significantly reduces the capacitance, leading to an even higher resonant frequency. Applying this to tuned filters results in a higher upper limit and a lower lower limit for the resonant frequency of a single resonant cavity, significantly expanding the tuning range and meeting the requirements for wide-range filter tuning. This provides a large optimization space for the filter, ultimately resulting in significantly better performance than filters using a monolithic moving plate. Additionally, the discrete metal plates in multi-sector adjustable moving plates can be designed with discrete radii according to engineering design needs, further increasing the adjustable range of the resonant cavity frequency or expanding the optimization space for the filter performance curve. The thickness and hardness of the metal plates can also be changed to address different needs in engineering design. By increasing the tuning range of a single filter, the number of filters required within a frequency band can be reduced, thereby lowering costs and increasing integration. Attached Figure Description

[0023] Figure 1 is a schematic diagram of the structure of a conventional moving plate assembly in the background art of this invention;

[0024] Figure 2 is a side view of a conventional moving plate assembly in the background art of this invention;

[0025] Figure 3 is a schematic diagram of the existing moving plate assembly and stationary plate distribution in the background art of this invention;

[0026] Figure 4 is a structural schematic diagram of an adjustable plate assembly according to the present invention;

[0027] Figure 5 is a side view of an adjustable plate assembly according to the present invention;

[0028] Figure 6 is a schematic diagram of the assembly of an adjustable plate assembly on a moving plate shaft according to the present invention;

[0029] Figure 7 is a schematic diagram of the structure of a tuning filter according to the present invention;

[0030] Figure 8 shows the performance curve of a tuning filter of the present invention in a tuning range exceeding twice the frequency band.

[0031] Label Explanation:

[0032] 1-Moving plate; 2-Fixed ring; 3-Moving plate shaft; 4-Stationary plate; 5-Metal housing;

[0033] 6-Adjustable plate; 61-Fan-shaped metal plate; 62-Metal plate unit; 7-Fixing ring; 8-Moving plate shaft;

[0034] 9-Moving piece washer; 10-Moving piece spacer; 11-Stationary piece. Detailed Implementation

[0035] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0036] Referring to Figures 4 to 8, the present invention provides an adjustable sheet assembly, comprising at least two sets of adjustable sheets arranged at intervals between each other, each set of adjustable sheets having at least two fan-shaped metal sheets with different radii, and each fan-shaped metal sheet having discretely distributed metal sheet units.

[0037] As can be seen from the above description, the beneficial effects of the present invention are as follows:

[0038] This invention provides an adjustable plate assembly, comprising at least two sets of adjustable plates spaced apart from each other. Each set of adjustable plates has at least two fan-shaped metal plates with different radii, and each fan-shaped metal plate has discretely distributed individual metal plates. In use, the adjustable plate initially faces the stationary plate. In a resonant cavity of fixed size, for a typical integral adjustable plate, the facing distance between it and the stationary plate is completely fixed, and the operating frequency of the filter depends only on the facing area between the adjustable plate and the stationary plate, resulting in a limited tuning range. However, the aforementioned adjustable plate is composed of multiple discrete fan-shaped metal plates, which are not connected to each other. Each individual metal plate can be individually manipulated using tweezers or needle-nose pliers to change its facing distance with the stationary plate. By adjusting the distance between the individual metal plates and the stationary plate, the capacitance of the resonant cavity can be finely adjusted, thereby precisely changing the resonant frequency of the resonant cavity. Furthermore, by using sector-shaped metal sheets with discrete radii, the area facing the stationary sheet is maximized when the radius is at its maximum, resulting in a large capacitance and a low resonant frequency. Bringing the sector-shaped metal sheet closer to the stationary sheet significantly increases the capacitance, making it even larger and the resonant frequency even lower. Conversely, when the sector-shaped metal sheet radius is at its minimum, the area facing the stationary sheet is minimized, resulting in a small capacitance and a high resonant frequency. Moving the sector-shaped metal sheet further away from the stationary sheet significantly reduces the capacitance, making its resonant frequency even higher.

[0039] Furthermore, the fan-shaped metal sheet is provided with multiple strip-shaped grooves extending towards the center along its arc length to form discretely distributed metal sheet units.

[0040] As can be seen from the above description, by setting the strip-shaped through groove, the fan-shaped metal sheet has multiple discretely distributed metal sheet units.

[0041] Furthermore, the same sector-shaped metal sheet has individual metal sheets with corresponding different central angles.

[0042] Furthermore, a movable plate washer and a movable plate pad are sleeved on the movable plate shaft; the movable plate pad is sleeved on the movable plate shaft and located between two adjacent sets of adjustable movable plates, each set of adjustable movable plates consists of two movable plates arranged at intervals, and the movable plate washer is sleeved on the movable plate shaft and located between two adjacent movable plates.

[0043] As can be seen from the above description, by setting the moving plate washer and the moving plate pad, it can be ensured that the distance between the two moving plates and the distance between the two sets of adjustable moving plates remains fixed and will not be offset by the influence of the moving plate shaft drive, thereby affecting the positional relationship with the stationary plate and causing a sudden change in the performance of the filter.

[0044] Furthermore, the thickness of the moving plate washer is 1 mm; the thickness of the moving plate pad is 3.4 mm.

[0045] Furthermore, the number of adjustable pieces is four sets.

[0046] Furthermore, the maximum radius of the fan-shaped metal sheet is 38 mm, and the minimum radius of the fan-shaped metal sheet is 22 mm.

[0047] As can be seen from the above description, using the specific parameters described above can effectively optimize product performance.

[0048] A tuned filter includes a metal housing and a fixed ring, a moving plate shaft, and a stationary plate respectively disposed inside the metal housing. The fixed ring is sleeved on the moving plate shaft. The metal housing also provides an adjustable plate assembly, which is installed on the outer circumferential ring wall of the fixed ring. The adjustable plate and the stationary plate are arranged in a one-to-one correspondence.

[0049] As described above, the beneficial effects of this invention are as follows: applying the aforementioned tunable plate assembly to a tuned filter results in a higher upper limit and a lower lower limit to the resonant frequency of a single resonant cavity, significantly increasing the tuning range and meeting the requirements for wide-range filter tuning. This leads to a larger optimization space for the resulting filter, ultimately achieving significantly better performance than filters using a monolithic tunable plate. Furthermore, the discrete metal plates in the multi-sector tunable plate can be designed with discrete radii according to engineering design needs, further increasing the adjustable frequency range of the resonant cavity or expanding the optimization space for the filter performance curve. The thickness and material hardness of the metal plates can also be altered to address different needs in engineering design. By increasing the tuning range of a single filter, the number of filters required within a frequency band can be reduced, thereby lowering costs and enhancing integration.

[0050] Furthermore, the stationary plate has a groove for the adjustable plate to pass through, and the direct distance between the stationary plate and the adjustable plate is 0.7mm.

[0051] Furthermore, the groove width of the stationary plate is 3.4 mm.

[0052] As can be seen from the above description, using the specific parameters described above can achieve better results.

[0053] Please refer to Figures 4 to 8. Embodiment 1 of the present invention is as follows:

[0054] The present invention provides a tuning filter, comprising a metal housing 5 and a fixed ring 7, a moving plate shaft 8 and a stationary plate 11 respectively disposed inside the metal housing 5, wherein the moving plate shaft 8 passes through the metal housing 5 and is connected to other resonant cavities or motors.

[0055] The metal housing 5 also includes an adjustable plate assembly, which is mounted on the outer circumferential wall of the fixed ring 7, which is sleeved on the movable plate shaft 8. The adjustable plate assembly rotates together with the movable plate shaft 8.

[0056] The adjustable plate assembly includes four sets of adjustable plates 6 arranged at intervals, each of which corresponds to a stationary plate 11. Each set of adjustable plates 6 has at least two fan-shaped metal plates 61 with different radii, wherein the maximum radius of the fan-shaped metal plates is 38 mm and the minimum radius of the fan-shaped metal plates is 22 mm.

[0057] Each of the aforementioned sector-shaped metal sheets has discretely distributed metal sheet units 62. Specifically, the sector-shaped metal sheet has multiple strip-shaped grooves extending towards the center along its arc length to form discretely distributed metal sheet units. The same sector-shaped metal sheet has metal sheet units corresponding to different central angles.

[0058] A movable plate washer 9 and a movable plate pad 10 are fitted onto the movable plate shaft 8; the thickness of the movable plate washer is 1 mm; the thickness of the movable plate pad is 3.4 mm. The movable plate pad is fitted onto the movable plate shaft and located between two adjacent sets of adjustable movable plates. Each set of adjustable movable plates consists of two movable plates arranged at intervals between each other, and the movable plate washer is fitted onto the movable plate shaft and located between two adjacent movable plates.

[0059] Each set of moving plates is tightly attached to both sides of the moving plate washer 9, with the initial spacing equal to the thickness of the moving plate washer 9 (1mm). The initial vertical distance between the adjustable plate and the stationary plate 11 is 0.7mm.

[0060] By setting moving plate washers and moving plate pads, it can be ensured that the distance between the two moving plates and between the two sets of adjustable moving plates remains fixed and will not be offset by the moving plate shaft drive, thus affecting the positional relationship with the stationary plate and causing sudden changes in the filter performance.

[0061] The stationary plate has grooves for the adjustable plate to pass through, and the number of grooves is equal to the number of adjustable plates. The direct spacing between the stationary plate and the adjustable plate is 0.7 mm. The groove width of the stationary plate is 3.4 mm.

[0062] The number of grooves in the stationary plate, the radius of the sector-shaped metal plate, the spacing between the sector-shaped metal plates, and the spacing between the sector-shaped metal plate and the stationary plate in the above data can all be set according to actual requirements.

[0063] In one specific embodiment, the stationary plate 11 is connected to the metal cavity 5 via a metal resonant rod. The adjustable plate 6, the fixed ring 7, the moving plate washer 9, and the moving plate pad 10 are all fixed on the moving plate shaft 8, ensuring that the positions of the adjustable plate assembly and the stationary plate assembly are stable, the formed capacitor is stable, and the filter performance is stable.

[0064] In one specific embodiment, the adjustable piece 6 is a "spiral" shape with a sudden change in radius. Other shapes, such as circles, polygons, and irregular shapes, are also feasible options.

[0065] As shown in Figure 8, the tuned filter designed using the technical solution provided by this invention can be tuned in the range of 118MHz to 512MHz, with a frequency band of [missing information]. That is, greater than twice the frequency band.

[0066] In summary, the present invention provides an adjustable plate assembly and a tuned filter, comprising at least two sets of adjustable plates arranged at intervals. Each set of adjustable plates has at least two sector-shaped metal plates with different radii, and each sector-shaped metal plate has discretely distributed individual metal plates. In use, the adjustable plate initially faces the stationary plate. In a resonant cavity of fixed size, for a typical integral adjustable plate, the facing distance between it and the stationary plate is completely fixed, and the operating frequency of the filter depends only on the facing area between the adjustable plate and the stationary plate, resulting in a limited tuning range. However, the aforementioned adjustable plate is composed of multiple discrete sector-shaped metal plates spliced ​​together, which are not connected to each other. Each individual metal plate can be individually manipulated using tweezers or needle-nose pliers to make its facing distance with the stationary plate variable. By adjusting the distance between the individual metal plates and the stationary plate, the capacitance of the resonant cavity can be finely adjusted, thereby precisely changing the resonant frequency of the resonant cavity. Furthermore, by using discrete sector-shaped metal plates, the area facing the stationary plate is maximized when the radius is at its maximum, resulting in a large capacitance and a low resonant frequency. Bringing the sector-shaped metal plates closer to the stationary plate significantly increases the capacitance, leading to an even larger capacitance and a lower resonant frequency. Conversely, when the sector-shaped metal plate radius is at its minimum, the area facing the stationary plate is minimized, resulting in a small capacitance and a high resonant frequency. Moving the sector-shaped metal plates further away from the stationary plate significantly reduces the capacitance, leading to an even higher resonant frequency. Applying this to tuned filters results in a higher upper limit and a lower lower limit for the resonant frequency of a single resonant cavity, significantly expanding the tuning range and meeting the requirements for wide-range filter tuning. This provides a large optimization space for the filter, ultimately resulting in significantly better performance than filters using a monolithic moving plate. Additionally, the discrete metal plates in multi-sector adjustable moving plates can be designed with discrete radii according to engineering design needs, further increasing the adjustable range of the resonant cavity frequency or expanding the optimization space for the filter performance curve. The thickness and hardness of the metal plates can also be changed to address different needs in engineering design. By increasing the tuning range of a single filter, the number of filters required within a frequency band can be reduced, thereby lowering costs and increasing integration.

[0067] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An adjustable plate assembly, characterized in that, The device includes at least two sets of adjustable plates spaced apart from each other. Each adjustable plate has at least two fan-shaped metal plates with different radii, and each fan-shaped metal plate has discretely distributed metal plate units. Each fan-shaped metal plate has multiple strip-shaped slots extending towards its center along its arc length to form discretely distributed metal plate units. The same fan-shaped metal plate has metal plate units with corresponding different central angles. Each metal plate unit can be individually manipulated with tweezers or needle-nose pliers to finely change the resonant frequency. A movable plate washer and a movable plate pad are fitted onto the movable plate shaft. The movable plate pad is fitted onto the movable plate shaft and located between two adjacent sets of adjustable plates. Each set of adjustable plates consists of two movable plates spaced apart from each other, and the movable plate washer is fitted onto the movable plate shaft and located between two adjacent movable plates.

2. The adjustable plate assembly according to claim 1, characterized in that, The thickness of the moving plate washer is 1 mm; the thickness of the moving plate pad is 3.4 mm.

3. The adjustable plate assembly according to claim 1, characterized in that, The number of adjustable pieces is four sets.

4. The adjustable plate assembly according to claim 1, characterized in that, The maximum radius of the fan-shaped metal sheet is 38 mm, and the minimum radius of the fan-shaped metal sheet is 22 mm.

5. A tuned filter, comprising a metal housing and a fixed ring, a moving plate shaft, and a stationary plate respectively disposed inside the metal housing, wherein the fixed ring is sleeved on the moving plate shaft, characterized in that, The metal housing is further provided with an adjustable plate assembly as described in any one of claims 1-4. The adjustable plate assembly is installed on the outer circumferential ring wall of the fixed ring, and the adjustable plate and the stationary plate are arranged in a one-to-one correspondence.

6. A tuning filter according to claim 5, characterized in that, The stationary plate has a groove for the adjustable plate to pass through, and the direct distance between the stationary plate and the adjustable plate is 0.7 mm.

7. A tuning filter according to claim 6, characterized in that, The groove width of the stationary plate is 3.4 mm.

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