A filter tap structure

Abstract

The embodiment of the present application discloses a filter tap structure for adjusting the time delay of a signal passing through a filter. The embodiment of the present application comprises: a housing, a signal port, a port resonant rod, a metal tap sheet, and a metal screw; the signal port, the port resonant rod, and the metal tap sheet are installed inside the housing; the signal port is used to receive or send radio frequency signals; the first end of the metal tap sheet is connected to the signal port, and the second end of the metal tap sheet is connected to the port resonant rod; the main body of the metal tap sheet is provided with a through hole, and the metal tap sheet extends around the edge of the through hole with an annular coupling portion of a preset height; the housing is provided with a screw hole at a position corresponding to the through hole, the metal screw penetrates the housing and is screwed into the screw hole, and the diameter of the metal screw is smaller than the inner diameter of the annular coupling portion.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of mobile communications, and specifically to a filter tap structure. Background Art

[0002] Filters are fundamental signal processing components. The advancement of modern communications technology places increasing demands on microwave components. In particular, as systems demand greater bandwidth, so too do the requirements for filters, with a growing variety of filter types. Filters primarily perform frequency selection and filtering. In 5G communications, the increased number of transceiver channels in devices necessitates more filters.

[0003] To reduce the space occupied by numerous filters, miniaturization of filters is a research hotspot in the communications industry. Currently, the production process for miniaturized filters is immature, resulting in large tolerances in the filters produced, leading to varying signal delays for the same filter model.

[0004] Therefore, a solution is urgently needed to solve the problem of non-uniform signal delay caused by filter miniaturization. Summary of the Invention

[0005] In order to adjust the delay of a small filter, the present application provides a filter tap structure, in which an adjustable metal screw is provided on the tap plate of the filter tap to adjust the signal delay of the filter, so that filters with different signal delays can adjust their own signal delays, and finally adjust the signal delays of multiple filters to the same size.

[0006] The embodiment of the present application provides a filter tap structure, comprising: a housing, a signal port, a port resonant rod, a metal tap sheet, and a metal screw;

[0007] The signal port, the port resonant rod and the metal tap are installed inside the housing;

[0008] The signal port is used to receive or send radio frequency signals;

[0009] The first end of the metal tap is connected to the signal port, and the second end of the metal tap is connected to the port resonant rod; the main body of the metal tap is provided with a through hole, and the metal tap is provided with an annular coupling portion of a preset height extending around the edge of the through hole;

[0010] The shell is provided with a screw hole at a position corresponding to the through hole. The metal screw passes through the shell and is screwed into the screw hole. The diameter of the metal screw is smaller than the inner diameter of the annular coupling portion.

[0011] Preferably, a resonance rod connecting column extends from the lower part of the port resonance rod, and the metal tap piece is connected to the port resonance rod through the resonance rod connecting column.

[0012] Preferably, the height of the resonant rod connecting column is lower than that of the port resonant rod.

[0013] Preferably, the inner diameter of the annular coupling portion is equal to the inner diameter of the through hole.

[0014] Preferably, the metal tap piece is provided with two 90-degree bends, and the metal tap piece is connected to the port resonant rod via the two 90-degree bends.

[0015] Preferably, the metal tap piece is provided with two 90-degree bends, and the metal tap piece is connected to the signal port via the two 90-degree bends.

[0016] Preferably, when the metal screw is tightened to the tightest, the bottom end of the metal screw is flush with the bottom end of the annular coupling portion.

[0017] Preferably, when the metal screw is not tightened, the bottom end of the metal screw is higher than the top end of the annular coupling portion.

[0018] Preferably, the metal tap piece is made of brass, tungsten iron or silver-plated metal.

[0019] Preferably, the metal screw is made of brass, tungsten iron or silver-plated metal.

[0020] It can be seen from the above technical solution that the embodiments of the present application have the following advantages: the present application sets an adjustable metal screw on the tap plate of the filter, adjusts the length of the metal screw to control the distributed capacitance of the tap plate, and changes the delay of the high-frequency signal passing through, with low cost and simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of a filter tap provided in this application. DETAILED DESCRIPTION

[0022] An embodiment of the present application provides a filter tap structure for adjusting the signal delay of a filter and unifying the signal delay of multiple filters.

[0023] The filter tap structure provided in the embodiment of the present application is specifically used to adjust the signal delay of a miniaturized filter. By setting an adjustable metal screw on the filter tap plate, the distributed capacitance of the filter tap plate is adjusted, thereby changing the delay of the signal passing through the tap plate.

[0024] See also Figure 1The filter tap structure of the embodiment of the present application includes: a housing 10, a signal port 20, a port resonant rod 30, a metal tap sheet 40 and a metal screw 50.

[0025] The housing 10 is the outer shell of the filter, with the signal port 20, port resonant rod 30, and metal tap 40 fixedly mounted inside. The signal port 20 is typically cylindrical and is used to connect to the filter's antenna or other circuit plug to receive or transmit RF signals. The shape of the signal port 20 matches the desired antenna or circuit plug, making it easy to insert and secure the plug into the signal port 20.

[0026] The first end of the metal tap 40 is connected to the signal port 20, and the second end of the metal tap 40 is used to connect to the port resonant rod 30, so that the port resonant rod 30 and the signal port 20 are electrically connected. When a signal is input to the signal port 20, the signal passes through the signal port 20, the metal tap 40, and the port resonant rod 30 in sequence, entering the filter cavity. A through hole 401 is provided in the central main portion of the metal tap 40, and an annular coupling portion 402 extends downward from the edge of the through hole to a certain height.

[0027] A screw hole is provided at the position of the shell 10 corresponding to the through hole 401, and the center of the screw hole is projected vertically to the same point as the center of the through hole 401. The metal screw 50 passes through the screw hole and penetrates the shell 10 from the outside. The diameter of the metal screw 50 is smaller than the inner diameter of the annular coupling part 402, so that the depth of the metal screw 50 vertically inserted into the shell 10 can be adjusted by loosening or tightening. The lower end of the metal screw 50 can be extended into the interior of the annular coupling part 402, thereby changing the distributed capacitance of the annular coupling part 402, so that the signal passing through the metal tap 40 changes due to the change in the distributed capacitance of the annular coupling part 402. It should be noted that when the metal screw 50 is extended into the annular coupling part 402, since the diameter of the metal screw 50 is smaller than the inner diameter of the annular coupling part 402, the metal screw 50 will not contact the inner wall of the annular coupling part 402.

[0028] In some specific embodiments, a shorter resonant rod connecting post 301 extends from the lower portion of the port resonant rod 30. The first end of the metal tap 40 is connected to the resonant rod connecting post 301, and the second end is connected to the signal port 20. When an external signal enters the filter, it passes through the signal port 20, the metal tap 40, and the port resonant rod connecting post 301 in sequence, and is coupled with other resonant rods in the port resonant rod 30.

[0029] In some specific implementations, the inner diameter of the annular coupling portion 402 is equal to the inner diameter of the through hole 401 .

[0030] In some specific embodiments, two 90-degree bends are provided on one side of the metal tap 40 connected to the port resonant rod 30, and the metal tap 40 is connected to the port resonant rod 30 via the two 90-degree bends. By adjusting the height difference between the two 90-degree bends, the height of the connection point between the metal tap 40 and the port resonant rod 30 can be changed. The portion of the metal tap 40 connected to the second end can also be provided with two 90-degree bends, and the metal tap 40 is connected to the signal port 20 via the two 90-degree bends. Similarly, by adjusting the height difference between the two 90-degree bends, the height of the connection point between the metal tap 40 and the signal port 20 can also be changed.

[0031] In some specific embodiments, when the metal screw 50 is tightened to the tightest, the length of the portion of the metal screw 50 that extends into the housing 10 reaches its maximum, and the bottom end of the metal screw 50 is flush with the bottom end of the annular coupling portion 402. At this time, the adjustment function of the metal screw 50 is maximized. In other specific embodiments, when the metal screw 50 is not tightened, the bottom end of the metal screw 50 can be higher than the top end of the annular coupling portion 402. At this time, the metal screw 50 has almost no effect on the distributed capacitance of the annular coupling portion 402. Only when the bottom end of the metal screw 50 extends into the annular coupling portion 402 will the distributed capacitance of the annular coupling portion 402 be changed. It can be seen that only when the bottom end of the metal screw 50 is inside the annular coupling portion 402, changing the length of the metal screw 50 will affect the distributed capacitance of the annular coupling portion 402, thereby changing the overall signal delay.

[0032] In some specific embodiments, the metal tap piece 40 can be made of a metal that is easy to process and has good conductivity, such as brass or ferrite, to reduce the resistance of the metal tap piece 40 and enhance the conductivity and coupling capabilities of the metal tap piece 40. Furthermore, the metal tap piece 40 can be made of silver-plated metal to further reduce the resistance and enhance the corrosion resistance and conductivity of the metal tap piece 40.

[0033] In some specific embodiments, the metal screw 50 can also be made of a metal that is easy to process and has good conductivity, such as brass or ferrite, to enhance the effect of the metal screw 50 on the distributed capacitance of the metal tap 40. Similarly, using silver-plated metal to make the tap can further reduce the resistance of the metal screw 50, thereby enhancing the effect of the metal screw 50 on the distributed capacitance of the metal tap 40 and improving the corrosion resistance and conductivity of the metal screw 40.

[0034] During the adjustment process, the longer the metal screw 50 extends into the annular coupling portion 40, the greater the signal delay through the filter tap. In a specific experiment, when the inner diameter of the annular coupling portion 40 was 4 mm and the diameter of the metal screw 50 was 2 mm, and the filter tap was connected to a 3.55 GHz signal, the specific delay changes caused by the different lengths of the metal screw 50 extending into the annular coupling portion 402 are shown in the following table:

[0035] Metal screw insertion length (mm) 1 4 7 10 13 Port delay value (ns) 4.29 5.94 22.5 52.54 82.54

[0036] It can be seen that the longer the metal screw 50 extends into the annular coupling portion 402, the greater the increase in the signal delay passing through this filter tap. It should be noted that when the bottom end of the metal screw 50 has extended from the lower end of the annular coupling portion 402, further adjusting the metal screw 50 downward will basically have no effect on the signal delay, and the signal delay passing through the filter tap has reached its maximum value. The dimensions of the above components are only used to help those skilled in the art understand this solution, and are not a limitation of this solution. The dimensions of each component can be designed according to the use environment. In specific use, the metal screw 50 can also be replaced with other diameters to achieve a larger or smaller delay adjustment effect.

[0037] This solution has a simple physical structure, is easy to implement, and has low production costs. By adjusting the length of the metal screw 50, the signal delay of the filter tap can be adjusted, ensuring that the filter delay meets the target value. This reduces the tolerance requirements for product component materials, reduces costs, and improves production efficiency. Furthermore, the solution offers a wide delay adjustment range, enabling a common tap material to be used across a range of products with similar frequencies.

Claims

1. A filter tap structure, characterized in that: include: Shell, signal port, port resonant rod, metal tap and metal screw; The signal port, the port resonant rod and the metal tap are installed inside the housing; The signal port is used to receive or send radio frequency signals; The first end of the metal tap is connected to the signal port, and the second end of the metal tap is connected to the port resonant rod; the main body of the metal tap is provided with a through hole, and the metal tap is provided with an annular coupling portion of a preset height extending around the edge of the through hole; The shell is provided with a screw hole at a position corresponding to the through hole, and the metal screw passes through the shell and is screwed into the screw hole. The diameter of the metal screw is smaller than the inner diameter of the annular coupling part; when the metal screw is tightened to the tightest, the bottom end of the metal screw is flush with the bottom end of the annular coupling part; when the metal screw is not tightened, the bottom end of the metal screw is higher than the top end of the annular coupling part; the greater the length of the metal screw extending into the annular coupling part, the greater the signal delay value of the filter tap.

2. The filter tap structure according to claim 1, wherein: A resonance rod connecting column extends from the lower part of the port resonance rod, and the metal tap is connected to the port resonance rod through the resonance rod connecting column.

3. The filter tap structure according to claim 2, wherein: The height of the resonant rod connecting column is lower than that of the port resonant rod.

4. The filter tap structure according to any one of claims 1 to 3, characterized in that: An inner diameter of the annular coupling portion is equal to an inner diameter of the through hole.

5. The filter tap structure according to any one of claims 1 to 3, characterized in that: The metal tap piece is provided with two 90-degree bends, and the metal tap piece is connected to the port resonant rod via the two 90-degree bends.

6. The filter tap structure according to any one of claims 1 to 3, characterized in that: The metal tap piece is provided with two 90-degree bends, and the metal tap piece is connected to the signal port through the two 90-degree bends.

7. The filter tap structure according to any one of claims 1 to 3, characterized in that: The metal tap piece is made of brass, easy-to-turn iron or silver-plated metal.

8. The filter tap structure according to any one of claims 1 to 3, characterized in that: The metal screw is made of brass, easy-turned iron or silver-plated metal.

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