Elliptic function low-pass filter

Abstract

The utility model discloses an elliptic function low-pass filter, which belongs to the technical field of filters, and is characterized in that the elliptic function low-pass filter comprises a conductor rod and a plurality of inductance pieces, the inductance pieces sleeve the conductor rod and are connected with the conductor rod through fixing rods, and the inductance pieces are arranged at intervals along the length direction of the conductor rod. The inductance piece is sleeved with a capacitance piece, the capacitance piece is connected with the inductance piece through a connecting rod, and the effects that the performance of the elliptic function low-pass filter is easily achieved, and the problem of insufficient lumped parameter power capacity is solved are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of filters, and in particular to an elliptic function low-pass filter. Background Art

[0002] At present, with the development of electronic information technology, filters, as key components of signal processing, play an important role in various electronic devices.

[0003] The distributed parameters of low-frequency transmitters are relatively small, so lumped parameters can be used to achieve filtering performance. However, facing the filtering requirements of high-frequency transmitters, high-power high-frequency lumped parameter devices are difficult to implement. Therefore, traditional coaxial low-pass filters mainly rely on distributed parameters to achieve filtering performance, which is basically a candied haws structure.

[0004] Elliptic function low-pass filters are widely used because of their steep transition characteristics between passband and stopband. However, the candied haws structure is difficult to achieve the performance of elliptic function low-pass filters and is prone to the problem of insufficient lumped parameter power capacity. Utility Model Content

[0005] In order to easily realize the performance of an elliptic function low-pass filter and reduce the problem of insufficient lumped parameter power capacity, the utility model provides an elliptic function low-pass filter.

[0006] The utility model provides an elliptic function low-pass filter adopting the following technical solution:

[0007] An elliptic function low-pass filter comprises a conductor rod and a plurality of inductors, wherein the inductors are sleeved on the conductor rod and connected to the conductor rod via a fixing rod, the plurality of inductors are arranged at intervals along the length direction of the conductor rod, the inductors are sleeved with capacitors, and the capacitors are connected to the inductors via a connecting rod.

[0008] By adopting the above technical solution, the conductor rod is used to simulate the series inductance, and the inductor and capacitor are connected and located at different positions of the conductor rod to simulate the inductor and capacitor connected in series to the ground. Through software simulation, the performance of the elliptic function filter can be achieved. When a signal flows through the filter, the high-frequency signal component will be affected by the impedance of the inductor and capacitor, and thus be filtered out. The low-frequency signal component will pass through the filter smoothly, achieving the effect of low-pass filtering. Multiple inductors are arranged at intervals along the length direction of the conductor rod to form a specific inductor network. The capacitor is mounted on the inductor and closely cooperates with the inductor to form a stable capacitor-inductor combination structure. The capacitor-inductor combination structure is realized by distributed parameters respectively. A conductor rod connects multiple groups of capacitor-inductor combination structures, and a distributed parameter structure is used to realize lumped parameter elements, reducing the problem of insufficient lumped parameter power capacity.

[0009] Preferably, the inductor is a ring-shaped structure, and the diameters of the plurality of inductors gradually decrease along the length direction of the conductor rod.

[0010] By adopting the above technical solution, since the diameter of the inductor changes gradually, it can provide more flexible inductance adjustment, thereby enabling waveform selection, thereby more accurately controlling the filtering performance. In addition, this design is also conducive to reducing the overall size of the filter, making it more suitable for application scenarios with strict space requirements.

[0011] Preferably, the capacitor is a ring-shaped structure.

[0012] By adopting the above technical solution, the filter can have a more compact structure.

[0013] Preferably, the widths of the plurality of capacitors are set to be at least two different.

[0014] By adopting the above technical solution, the width of the capacitor is set differently to provide different capacitance values ​​to meet the performance requirements of the filter at different frequencies. By carefully adjusting the width of each capacitor, the filter performance can be finely controlled to ensure that the filter performs well under various working conditions.

[0015] Preferably, the fixing rod is detachably connected or fixedly connected to the conductor rod.

[0016] By adopting the above technical solution, a suitable connection mode can be selected according to the requirements of maintenance and replacement of components. For example, in the case where the inductor needs to be adjusted or replaced frequently, a detachable connection mode can be adopted to operate more flexibly.

[0017] Preferably, when the fixing rod and the conductor rod are fixedly connected, the fixing rod and the conductor rod are welded.

[0018] By adopting the above technical solution, the stability of the elliptic function low-pass filter structure is enhanced.

[0019] Preferably, when the fixing rod and the conductor rod are detachably connected, one end of the fixing rod is sleeved on the conductor rod and fixed to the conductor rod by a screw.

[0020] By adopting the above technical solution, the installation and maintenance of the elliptic function low-pass filter are facilitated.

[0021] Preferably, it further comprises an outer conductor shell, wherein the outer conductor shell is sleeved on the capacitor, a non-metallic support sleeve is provided between the outer conductor shell and the capacitor, and the support sleeve is connected to both the capacitor and the outer conductor shell.

[0022] By adopting the above technical solution, the outer conductor has a protective and shielding effect. The non-metallic support sleeve plays a dual role of insulation and support, which not only reduces the possibility of direct contact between the capacitor and the outer conductor shell, but also increases the stability of the entire structure.

[0023] In summary, the utility model has the following beneficial effects:

[0024] The conductor rod is used to simulate the series inductance. The inductor and capacitor are connected and located at different positions of the conductor rod to simulate the inductor and capacitor connected in series to the ground. Through software simulation, the performance of the elliptic function filter can be achieved. When a signal flows through the filter, the high-frequency signal component will be affected by the impedance of the inductor and capacitor, and thus be filtered out. The low-frequency signal component will pass through the filter smoothly, achieving the effect of low-pass filtering. Multiple inductors are arranged at intervals along the length of the conductor rod to form a specific inductor network. The capacitor is mounted on the inductor and closely cooperates with the inductor to form a stable capacitor-inductor combination structure. The capacitor-inductor combination structure is realized using distributed parameters. A conductor rod connects multiple groups of capacitor-inductor combination structures, and a distributed parameter structure is used to realize lumped parameter components, reducing the problem of insufficient lumped parameter power capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of an elliptic function low-pass filter in Example 1.

[0026] Figure 2 The purpose is to show the positional relationship between the inductor and the conductor rod in Example 1.

[0027] Figure 3 It is a circuit diagram of the principle of an elliptic function low-pass filter in Example 1.

[0028] Figure 4 The purpose is to show the positional relationship between the inductor and the conductor rod in Example 2.

[0029] Figure 5 yes Figure 4 Enlarged schematic diagram of part A.

[0030] Description of reference numerals:

[0031] 1. Conductor rod; 2. Inductor; 21. Notch; 3. Fixing rod; 31. Screw; 4. Capacitor; 5. Connecting rod; 6. Support sleeve; 7. Outer conductor shell. DETAILED DESCRIPTION

[0032] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0033] An elliptic function low-pass filter, refer to Figure 1 , Figure 2 and Figure 3 , comprising a conductor rod 1 and a plurality of inductors 2, wherein the inductors 2 are sleeved on the conductor rod 1 and connected to the conductor rod 1 through a fixing rod 3. The plurality of inductors 2 are arranged at intervals along the length direction of the conductor rod 1. A capacitor 4 is sleeved on the inductor 2, and the capacitor 4 is fixedly connected to the inductor 2 through a connecting rod 5.

[0034] The conductor rod 1 is used to simulate the series inductance. The inductor 2 and the capacitor 4 are connected and located at different positions of the conductor rod 1 to simulate the inductor and capacitor connected in series to the ground. Through software simulation, the performance of the elliptic function filter can be achieved. When a signal flows through the filter, the high-frequency signal component will be affected by the impedance of the inductor 2 and the capacitor 4, and thus be filtered out. The low-frequency signal component will pass through the filter smoothly, achieving the effect of low-pass filtering. Multiple inductors 2 are arranged at intervals along the length direction of the conductor rod 1 to form a specific inductor network. The capacitor 4 is mounted on the inductor 2 and closely cooperates with the inductor 2 to form a stable capacitor-inductor combination structure. The capacitor-inductor combination structure is realized using distributed parameters. A conductor rod 1 connects multiple groups of capacitor-inductor combination structures, and adopts a distributed parameter structure to realize lumped parameter elements, thereby reducing the problem of insufficient lumped parameter power capacity.

[0035] Reference Figure 2 The cross section of the conductor rod 1 is circular, and the diameters at both ends of the conductor rod 1 are larger than the diameter of the middle section.

[0036] Reference Figure 2 In this embodiment, four inductors 2 and four capacitors 4 are provided, and the four capacitors 4 correspond one to one with the four inductors 2. In other embodiments, the number of inductors 2 and capacitors 4 and their specific positions on the conductor rod 1 can be precisely adjusted according to filtering requirements.

[0037] Reference Figure 2 The inductor 2 is a circular ring structure. As the trap frequency gradually increases, the diameters of the four inductors 2 gradually decrease along the length direction of the conductor rod 1. A notch 21 is provided on the inductor 2, and the size of the notch 21 can be fine-tuned to adjust the inductance.

[0038] The diameter of the inductor 2 is set according to the actual situation. The gradual change of the diameter of the inductor 2 causes the inductance value to change. The change of the inductance value can meet specific filtering requirements and make the entire filter structure more compact and coordinated. The design of the annular inductor 2 also facilitates the installation and connection of the capacitor 4.

[0039] Reference Figure 2 The fixing rod 3 is fixedly connected to the conductor rod 1 and the inductor 2. Specifically, the fixing rod 3 and the conductor rod 1 are fixed by welding, which has high stability.

[0040] Reference Figure 2 The capacitor element 4 is a circular ring structure, and the widths of the multiple capacitor elements 4 are set to at least two different values, which need to be debugged according to actual conditions.

[0041] The ring-shaped capacitor 4 can not only closely cooperate with the inductor 2, but also reduce space occupation and improve the integration of the overall structure. By carefully adjusting the width of each capacitor 4, the filter performance can be finely controlled, thereby ensuring that the filter can perform well under various working conditions.

[0042] Reference Figure 1 and Figure 2 The elliptic function low-pass filter also includes an outer conductor shell 7, which is sleeved outside the plurality of capacitors 4, and a distance is left between both ends of the outer conductor shell 7 and the conductor rod 1. A support sleeve 6 is provided between the outer conductor shell 7 and the capacitors 4. The support sleeve 6 is sleeved on the capacitors 4 and fixedly connected to the capacitors 4. The outer conductor shell 7 is fixedly connected to the support sleeve 6. The support sleeve 6 is made of a non-metallic material, and the non-metallic material is rubber or the like.

[0043] The outer conductor shell 7 effectively isolates external interference, thereby enhancing the stability and reliability of the filter. The support sleeve 6 not only ensures the stability of the structure, but also reduces the risk of short circuit between the capacitor 4 and the outer conductor shell 7.

[0044] The use principle of the present application is as follows: the conductor rod 1 is used to simulate the series inductance, and the inductor 2 and the capacitor 4 are connected and located at different positions of the conductor rod 1, which are used to simulate the inductor and capacitor connected in series to the ground. Through software simulation, the performance of the elliptic function filter can be achieved. When a signal flows through the filter, the high-frequency signal component will be affected by the impedance of the inductor 2 and the capacitor 4, and thus be filtered out. The low-frequency signal component will pass through the filter smoothly, achieving the effect of low-pass filtering. Multiple inductors 2 are arranged at intervals along the length direction of the conductor rod 1 to form a specific inductor network. The capacitor 4 is mounted on the inductor 2 and closely cooperates with the inductor 2 to form a stable capacitor-inductor combination structure, and the capacitor-inductor combination structure is respectively realized with distributed parameters. A conductor rod 1 connects multiple groups of capacitor-inductor combination structures, and adopts a distributed parameter structure to realize lumped parameter elements, thereby reducing the occurrence of insufficient lumped parameter power capacity problems.

[0045] By gradually changing the diameter of the inductor 2, a more flexible inductance value adjustment can be provided, thereby enabling waveform selection, thereby more accurately controlling the filtering performance. At the same time, by carefully adjusting the width of each capacitor 4, the filter performance can be finely controlled, thereby ensuring that the filter can perform well under various working conditions.

[0046] Example 2

[0047] An elliptic function low-pass filter, which differs from embodiment 1 in that, with reference to Figure 4 and Figure 5 The fixing rod 3 is detachably connected to the conductor rod 1, one end of the fixing rod 3 is sleeved on the conductor rod 1, the fixing rod 3 is threadedly connected with a screw 31, and the screw 31 is threadedly connected to the conductor rod 1 to achieve the fixing of the fixing rod 3 and the conductor rod 1. It is convenient for the installation and maintenance of the filter.

[0048] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An elliptic function low-pass filter, characterized in that: The invention comprises a conductor rod (1) and a plurality of inductors (2), wherein the inductors (2) are sleeved on the conductor rod (1) and connected to the conductor rod (1) via a fixing rod (3), the plurality of inductors (2) are arranged at intervals along the length direction of the conductor rod (1), the inductors (2) are sleeved with capacitors (4), and the capacitors (4) are connected to the inductors (2) via a connecting rod (5).

2. An elliptic function low-pass filter according to claim 1, characterized in that: The inductor (2) is a ring-shaped structure, and the diameters of the plurality of inductors (2) gradually decrease along the length direction of the conductor rod (1).

3. An elliptic function low-pass filter according to claim 1, characterized in that: The capacitor (4) is a ring-shaped structure.

4. An elliptic function low-pass filter according to claim 1 or 3, characterized in that: The widths of the plurality of capacitors (4) are set to be at least two different.

5. An elliptic function low-pass filter according to claim 1, characterized in that: The fixing rod (3) is detachably connected or fixedly connected to the conductor rod (1).

6. An elliptic function low-pass filter according to claim 5, characterized in that: When the fixing rod (3) and the conductor rod (1) are detachably connected, one end of the fixing rod (3) is sleeved on the conductor rod (1) and fixed to the conductor rod (1) by means of a screw (31).

7. An elliptic function low-pass filter according to claim 5, characterized in that: When the fixing rod (3) and the conductor rod (1) are fixedly connected, the fixing rod (3) and the conductor rod (1) are welded.

8. An elliptic function low-pass filter according to claim 1, characterized in that: It also comprises an outer conductor shell (7), the outer conductor shell (7) being sleeved on the capacitor (4), a non-metallic support sleeve (6) being provided between the outer conductor shell (7) and the capacitor (4), the support sleeve (6) being connected to both the capacitor (4) and the outer conductor shell (7).

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