Low-pass filter

Abstract

The present invention provides a low-pass filter device having improved attenuation performance relative to the same length. [Solution] The low-pass filter device includes a first port arranged on one side in the vertical direction, a second port arranged on the other side in the vertical direction, a plurality of metal members spaced apart from each other between the first port and the second port, a plurality of connecting members arranged between each of the plurality of metal members, a first dielectric tube arranged to surround at least one of the plurality of metal members, a metal pipe arranged to surround the first dielectric tube, and a second dielectric tube arranged to surround the metal members and metal pipe that are not surrounded by the first dielectric tube.

Description

Technical Field

[0001] The present disclosure relates to a low-pass filter device.

Background Art

[0002] The content described in this part only provides background information related to the present disclosure and does not constitute the prior art.

[0003] A filter is a device that uses the characteristics of frequency to block unwanted signals and only allows desired signals to pass through. There are various types of filters. A high-pass filter (HPF) is a filter that allows high-frequency signals to pass through and blocks low-frequency signals. A band-pass filter (BPF) is a filter that allows signals within a certain frequency bandwidth to pass through and blocks other signals. A low-pass filter (LPF) is a filter that allows low-frequency signals to pass through and blocks high-frequency signals.

[0004] FIG. 1 is a perspective view of a conventional low-pass filter.

[0005] Referring to FIG. 1, the conventional low-pass filter 1 can be manufactured by turning a round bar. The attenuation performance of the low-pass filter 1 is improved as the number of inductor members 3 and capacitor members 5 increases. Here, the inductor member 3 forms an inductor on a circuit diagram (not shown), and the capacitor member 5 forms a capacitor on the circuit diagram. As the number of inductor members 3 and capacitor members 5 arranged for improving the attenuation performance increases, there is a problem that the overall length of the low-pass filter 1 increases. The longer the length of the low-pass filter 1, the higher the manufacturing cost.

Summary of the Invention

[0006] Therefore, this disclosure aims to solve the aforementioned problems and primarily aims to provide a low-pass filter device that includes a metal pipe inside to form a notch and has improved attenuation performance relative to the same length.

[0007] Furthermore, the primary purpose of this disclosure is to reduce costs by providing a low-pass filter device that has a shorter length compared to other products with the same performance. [Means for solving the problem]

[0008] To achieve this objective, according to one embodiment of the present disclosure, a low-pass filter device is provided, which includes a first port arranged on one side in the vertical direction, a second port arranged on the other side in the vertical direction, a plurality of metal members spaced apart from each other between the first port and the second port, a plurality of connecting members arranged between each of the plurality of metal members, a first dielectric tube arranged to surround at least one of the plurality of metal members, a metal pipe arranged to surround the first dielectric tube, and a second dielectric tube arranged to surround the metal members not surrounded by the first dielectric tube and the metal pipe. [Effects of the Invention]

[0009] As explained above, according to this embodiment, the low-pass filter device includes a metal pipe inside to form a notch, which has the effect of exhibiting improved attenuation performance relative to the same length.

[0010] Furthermore, it is possible to create a low-pass filter device with a shorter length compared to other products with the same performance, resulting in cost savings. [Brief explanation of the drawing]

[0011] [Figure 1] This is a perspective view of a conventional low-pass filter. [Figure 2] This is a perspective view of a low-pass filter device according to one embodiment of the present disclosure. [Figure 3] This is an exploded perspective view of a low-pass filter device according to one embodiment of the present disclosure. [Figure 4] This is a cross-sectional view of a low-pass filter device according to one embodiment of the present disclosure. [Figure 5] This is a cross-sectional view taken along line A-A' in Figure 4. [Figure 6] This graph illustrates the attenuation characteristics of a low-pass filter device according to one embodiment of the present disclosure. [Figure 7] This is a circuit diagram of a low-pass filter device according to one embodiment of the present disclosure. [Modes for carrying out the invention]

[0012] Hereinafter, some embodiments of this disclosure will be described in detail with illustrative drawings. When assigning reference numerals to the components in each drawing, it should be noted that, as far as possible, identical components will have the same reference numeral, even if they are shown in other drawings. In describing this disclosure, if it is determined that a specific description of a related known configuration or function may obscure the gist of this disclosure, such detailed description will be omitted.

[0013] When describing the components of the embodiments relating to this disclosure, reference numerals such as 1st, 2nd, i), ii), a), b), etc. may be used. These reference numerals are used solely to distinguish a component from other components, and do not limit the nature, order, or sequence of the component in question. When the specification states that a part "includes" or "companies" a component, this does not exclude other components, unless explicitly stated otherwise, but rather means that it may further include other components.

[0014] In the present disclosure, the longitudinal direction means the x-axis direction disclosed in FIG. 4. That is, the longitudinal direction means the length direction of the low-pass filter device 10.

[0015] FIG. 2 is a perspective view of a low-pass filter device according to an embodiment of the present disclosure.

[0016] FIG. 3 is an exploded perspective view of a low-pass filter device according to an embodiment of the present disclosure.

[0017] FIG. 4 is a cross-sectional view of a low-pass filter device according to an embodiment of the present disclosure.

[0018] FIG. 5 is a cross-sectional view taken along the line A-A' of FIG. 4.

[0019] Referring to FIGS. 2 to 5, a low-pass filter apparatus 10 according to an embodiment of the present disclosure includes all or part of a first port 100, a second port 200, a plurality of metal members 300, a plurality of connecting members 400, a first dielectric tube 500, a metal pipe 600, a second dielectric tube 700, and a case 800.

[0020] The first port 100 is disposed on one side in the longitudinal direction. The first port 100 is electrically connected to the plurality of metal members 300. The first port 100 can transmit an input signal to the plurality of metal members 300. The first port 100 can form an inductor. According to an embodiment, the first port 100 can be connected to the first metal member 300A.

[0021] The second port 200 is disposed on the other vertical side. The second port 200 outputs a filtered signal. The second port 200 is electrically connected to a plurality of metal members 300. The second port 200 can receive signal transmission from the plurality of metal members 300. The second port 200 can form an inductor. According to one embodiment, the second port 200 can be connected to the fifth metal member 300E. According to the disclosure of FIGS. 3 to 4, the second port 200 is connected to the fifth metal member 300E, but is not limited thereto. For example, when the plurality of metal members 300 includes three metal members, the second port 200 is connected to the third metal member 300C.

[0022] According to one embodiment, the diameters of the first port 100 and the second port 200 can be formed to be the same as each other. According to one embodiment, the diameters of the first port 100 and the second port 200 can be formed larger than the diameter of the plurality of connecting members 400 and smaller than the diameter of the plurality of metal members 300.

[0023] The plurality of metal members 300 are disposed between the first port 100 and the second port 200. The plurality of metal members 300 can be spaced apart from each other. The plurality of metal members 300 can form a capacitor.

[0024] The plurality of metal members 300 can include the first metal member 300A to the Nth metal member. In this case, the plurality of metal members 300 can include the first metal member 300A to the Nth metal member in the order closest to the first port 100. Here, N is a natural number of 2 or more.

[0025] According to one embodiment, the plurality of metal members 300 can include the first metal member 300A to the fifth metal member 300E. Referring to FIGS. 3 and 4, the plurality of metal members 300 are disclosed as including the first metal member 300A to the fifth metal member 300E, but are not limited thereto. The plurality of metal members 300 can include five or more or less than five metal members.

[0026] Among the multiple metal members 300, the diameters of the metal members surrounded by the first dielectric tube 500 can be made the same. In one embodiment, the outer surfaces of the first metal member 300A and the second metal member 300B can be surrounded by the first dielectric tube 500. In this case, the diameters of the first metal member 300A and the second metal member 300B can be made the same. In addition, the diameters of the first metal member 300A and the second metal member 300B can be made smaller than the diameters of the third metal member 300C to the fifth metal member 300E.

[0027] According to one embodiment, the lengths of each of the multiple metal members 300 may be the same or different from each other. Here, the length of the metal member refers to the length in the vertical direction (x-axis in Figure 4). According to one embodiment, the length of the second metal member 300B may be longer than the length of the first metal member 300A.

[0028] In one embodiment, among the multiple metal members 300, the perimeters of the outer surfaces of the metal members not surrounded by the first dielectric tube 500 may be formed to be the same as the perimeters of the outer surfaces of the metal pipe 600. In another embodiment, the third metal member 300C to the fifth metal member 300E are not surrounded by the first dielectric tube 500, while the first metal member 300A to the second metal member 300B may be surrounded by the first dielectric tube 500. In this case, the perimeters of the outer surfaces of the third metal member 300C to the fifth metal member 300E may be formed to be the same as the perimeters of the outer surfaces of the metal pipe 600. That is, the components in contact with the inner surface of the second dielectric tube 700 may all have the same perimeter. Thus, when the perimeter of the outer surface of all the components is the same, the second dielectric tube 700 can stably fix the third metal member 300C to the fifth metal member 300E and the metal pipe 600.

[0029] The multiple connecting members 400 are positioned between each of the multiple metal members 300. The multiple connecting members 400 are electrically connected to the multiple metal members 300. The multiple connecting members 400 transmit input signals to the multiple metal members 300. The multiple connecting members 400 can form an inductor. Referring to Figures 3 and 4, the multiple connecting members 400 are disclosed to include, but are not limited to, a first connecting member 400A to a fourth connecting member 400D. The multiple connecting members 400 may include four or more or fewer than four connecting members.

[0030] The first dielectric tube 500 is arranged to surround at least one of the multiple metal members 300. The first dielectric tube 500 is positioned between the outer circumferential surfaces of the multiple metal members 300 and the inner circumferential surface of the metal pipe 600. According to one embodiment, the first dielectric tube 500 may be arranged to surround two or more metal members that are adjacent to each other among the multiple metal members 300. According to one embodiment, the first dielectric tube 500 may be arranged to surround the first metal member 300A and the second metal member 300B.

[0031] Referring to Figures 3 and 4, the first dielectric tube 500 is disclosed to surround the first metal member 300A and the second metal member 300B, but is not limited thereto. The first dielectric tube 500 may be configured to surround three or more metal members.

[0032] According to one embodiment, the first dielectric tube 500 can be manufactured using Teflon® (PTFE, polytetrafluoroethylene). According to one embodiment, the length of the first dielectric tube 500 can be longer than or the same as the length of the metal pipe 600. When the first dielectric tube 500 is formed to be longer than the metal pipe 600, the electrical stability of the low-pass filter device 10 is improved.

[0033] According to one embodiment, the first dielectric tube 500 may be a shrink tube. A shrink tube is a tube that shrinks when heated. Shrink tubes are mainly used as insulators for electric wires and cables.

[0034] Figure 6 is a graph illustrating the attenuation characteristics of a low-pass filter device according to one embodiment of the present disclosure.

[0035] Figure 7 is a circuit diagram of a low-pass filter device according to one embodiment of the present disclosure.

[0036] Referring to Figures 2 to 7, the metal pipe 600 is positioned between the first dielectric tube 500 and the second dielectric tube 700. The metal pipe 600 is positioned to surround the outer surface of the first dielectric tube 500.

[0037] The metal pipe 600 is capacitor C P A notch n can be formed by the metal pipe 600 on the frequency response graph. The notch n improves the attenuation performance of the low-pass filter device 10.

[0038] The better the attenuation performance of the filter, the more efficient filtering is possible. Because the attenuation performance is improved by the notch n, the low-pass filter device 10 may have a shorter vertical length than other filters that exhibit the same performance.

[0039] According to one embodiment, the length of the low-pass filter device 10 required to achieve the same performance as a conventional filter is approximately 70% of the length of the conventional filter. In other words, it is possible to shorten the filter length by more than 30% compared to a conventional filter while achieving the same performance. As the length of the low-pass filter device 10 decreases, manufacturing costs can be reduced. The number of inductors and capacitors is not limited to the number shown in Figure 7. For example, the low-pass filter device 10 can form a circuit diagram different from the circuit diagram in Figure 7 by changing the number of arrangements of multiple metal members 300, the length of the first dielectric tube 500, the number of arrangements of the first dielectric tube 500, the length of the metal pipe 600, the number of arrangements of the metal pipe 600, etc.

[0040] Referring to Figures 3 and 4, the metal pipe 600 is disclosed to be arranged as a single unit inside the second dielectric tube 700, but is not limited to this arrangement. Multiple metal pipes 600 may be arranged. Arranging multiple metal pipes 600 can improve the attenuation performance of the filter.

[0041] Referring to Figure 4, the length of the metal pipe 600 may be formed to be the same as the distance from the upper surface of the first metal member 300A to the bottom surface of the second metal member 300B. The upper surface of the first metal member 300A refers to the surface closest to the first port 100, and the bottom surface of the second metal member 300B refers to the other surface closest to the second port 200. The length of the metal pipe 600 is not limited to the disclosure in Figure 4. The length of the metal pipe 600 is not limited by the arrangement of the multiple metal members 300 or the distance between the multiple metal members 300.

[0042] The second dielectric tube 700 is placed inside the case 800. The second dielectric tube 700 is positioned to surround the plurality of metal members 300 and metal pipes 600. Specifically, the second dielectric tube 700 is positioned to surround the metal members 300 that are not surrounded by the first dielectric tube 500 and the metal pipes 600. According to one embodiment, the length of the second dielectric tube 700 may be longer than the length from the upper surface of the first metal member 300A to the lower surface of the fifth metal member 300E. In this case, the second dielectric tube 700 stably fixes the components placed inside it and improves the electrical stability of the low-pass filter device 10.

[0043] In one embodiment, the second dielectric tube 700 may be formed to surround the metal pipe 600, the third metal member 300C, the fourth metal member 300D, and the fifth metal member 300E. In this case, the perimeter of the outer surface of the metal pipe 600 and the perimeter of the outer surfaces of the third metal member 300C, the fourth metal member 300D, and the fifth metal member 300E may be formed to be the same. Referring to Figure 3, the second dielectric tube 700 surrounds the third metal member 300C to the fifth metal member 300E and the metal pipe 600, but is not limited to this. The number of metal members surrounded by the second dielectric tube 700 will vary depending on the number of metal members placed between the first port 100 and the second port 200. The number of metal members surrounded by the second dielectric tube 700 will vary depending on the number of metal members surrounded by the metal pipe 600.

[0044] The second dielectric tube 700 prevents current leakage and noise generation between adjacent components. The second dielectric tube 700 provides a stable electrical environment, assists the operation of the low-pass filter device 10, and improves the filtering efficiency of the low-pass filter device 10. According to one embodiment, the second dielectric tube 700 may be manufactured using Teflon®. The second dielectric tube 700 may be a heat-shrinkable tube.

[0045] The case 800 forms an internal housing space. The case 800 is formed to surround the second dielectric tube 700, the first port 100, and the second port 200. The case 800 improves the durability and electrical stability of the low-pass filter device 10. Referring to Figures 2 and 5, the cross-section of the case 800 is shown as a rectangular section with a hole in the center, but is not limited thereto. The cross-section of the case 800 can have various shapes.

[0046] The above description is merely illustrative of the technical concept of this embodiment, and any person with ordinary skill in the art to which this embodiment belongs will be able to make various modifications and variations without departing from the essential characteristics of this embodiment. Therefore, this embodiment is for illustrative purposes only, not to limit the technical concept of this embodiment, and the scope of the technical concept of this embodiment is not limited by this embodiment. The scope of protection of this embodiment should be interpreted by the claims, and all technical concepts within their equivalent scope should be interpreted as being included in the scope of rights of this embodiment.

[0047] [Cross-reference with related applications] This patent application claims priority to patent application no. 10-2023-0069807, filed in Korea on 31 May 2023, which is included herein by reference in its entirety. [Explanation of symbols]

[0048] 10 Low-pass filter device 100 First port 200 Second port 300 Multiple metal components 400 Multiple connecting members 500 First dielectric tube 600 metal pipes 700 Second dielectric tube 800 cases

Claims

1. A first port located on one side in the vertical direction, A second port located on the other side in the vertical direction, A plurality of metal members are arranged spaced apart from each other between the first port and the second port, Among the plurality of metal members, a plurality of connecting members are arranged between each of the metal members, A first dielectric tube is arranged to surround at least one of the plurality of metal members, A metal pipe arranged to surround the first dielectric tube, A low-pass filter device comprising, among the plurality of metal members, a metal member not surrounded by the first dielectric tube and a second dielectric tube arranged to surround the metal pipe.

2. The plurality of metal members include the first to the Nth metal members, The first metal member is positioned closest to the first port, The metal member N is positioned furthest from the first port, The low-pass filter device according to claim 1, wherein N is a natural number of 2 or more.

3. The low-pass filter device according to claim 1, wherein the first dielectric tube is arranged to surround two or more adjacent metal members among the plurality of metal members.

4. The low-pass filter device according to claim 2, wherein the first dielectric tube is arranged to surround the first metal member and the second metal member.

5. The low-pass filter device according to claim 1, wherein the lengths of each of the plurality of metal members are formed to be different from each other.

6. The low-pass filter device according to claim 2, wherein the length of the second metal member is formed to be longer than the length of the first metal member.

7. The low-pass filter device according to claim 1, wherein the diameters of the metal members surrounded by the first dielectric tube are the same among the plurality of metal members.

8. The low-pass filter device according to claim 2, wherein the diameter of the first metal member and the diameter of the second metal member are formed to be the same as those of the first metal member.

9. The low-pass filter device according to claim 1, wherein the perimeter of the outer surface of the metal member not surrounded by the first dielectric tube is formed to be the same as the perimeter of the outer surface of the metal pipe.

10. The first metal member and the second metal member are surrounded by the first dielectric tube 500. The third to fifth metal members are not surrounded by the first dielectric tube. The low-pass filter device according to claim 2, wherein the perimeters of the outer surfaces of the third to fifth metal members are formed to be the same as the perimeter of the outer surface of the metal pipe.

11. The low-pass filter device according to claim 1, wherein the length of the first dielectric tube is formed to be longer than or equal to the length of the metal pipe.

12. The low-pass filter device according to claim 1, wherein the metal pipe forms a capacitor.

13. The low-pass filter device according to claim 1, wherein the metal pipe forms a notch for improving attenuation performance.

14. The low-pass filter device according to claim 1, further comprising the second dielectric tube, the first port, and a case formed to surround the second port.

15. The low-pass filter device according to claim 1, wherein the diameters of the first port and the second port are formed to be the same as those of the first port.

16. The low-pass filter device according to claim 1, wherein the diameters of the first port and the second port are formed to be smaller than the diameters of the plurality of metal members and larger than the diameters of the plurality of connecting members.

17. The low-pass filter device according to claim 1, wherein at least one of the first dielectric tube and the second dielectric tube is manufactured using Teflon®.

18. The low-pass filter device according to claim 1, wherein at least one of the first dielectric tube and the second dielectric tube is a heat-shrinkable tube that shrinks with heat.

19. The low-pass filter device according to claim 2, wherein the length of the metal pipe is formed to be the same as the distance from the upper surface of the first metal member to the lower surface of the second metal member.

20. The low-pass filter device according to claim 2, wherein the length of the second dielectric tube is formed to be longer than the length from the upper surface of the first metal member to the lower surface of the fifth metal member.

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