Low-frequency anti-interference filter and communication equipment
By setting passband grooves on the resonant base, the spacing of the resonant metal pillars can be adjusted, which solves the problem of insufficient out-of-band suppression capability of traditional low-pass filters and achieves better filtering effect and anti-interference capability.
Patent Information
- Application Number
- CN202520133544.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-01-20
AI Technical Summary
Traditional low-pass filters have poor out-of-band rejection capabilities, resulting in poor filtering performance and insufficient anti-interference capabilities.
A low-frequency anti-interference filter is designed by setting a passband groove on the resonant base, allowing the resonant metal pillar to be movably set in the groove. By adjusting the distance between the resonant metal pillar and the resonant base, the filter capacitor on the low-pass resonant unit can be adjusted to improve the out-of-band rejection capability.
By adjusting the spacing between the resonant metal pillar and the resonant base, effective suppression of different passbands is achieved, thereby improving the out-of-band suppression capability of the filter.
Smart Images
Figure CN223786030U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of communication equipment technology, and in particular to a low-frequency anti-interference filter and communication equipment. Background Technology
[0002] A filter is a filtering circuit composed of a combination of inductors, capacitors, and resistors. Because inductors have the characteristic of passing low frequencies and blocking high frequencies, they can filter out one or more harmonics, and have the functions of filtering noise and separating signals. They are widely used in the field of electronic equipment transmission. LC filters can be classified according to their function as: LC low-pass filters, LC band-pass filters, high-pass filters, LC all-pass filters, and LC band-stop filters.
[0003] However, traditional low-pass filters use a linear structure design, resulting in low out-of-band rejection ratios and poor suppression of signals outside the specified frequency band. Consequently, some interference signals inevitably exist in the circuit, leading to poor filtering performance and weak anti-interference capabilities. Utility Model Content
[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a low-frequency anti-interference filter and communication device that effectively improves out-of-band suppression capability.
[0005] The purpose of this disclosure is achieved through the following technical solution:
[0006] A low-frequency anti-interference filter includes: a filter housing and a low-pass filter assembly; the filter housing includes a casing, a filter input terminal, and a filter output terminal, the casing having a low-pass filter cavity, and the filter input terminal and the filter output terminal being connected to the outer wall of the casing; the low-pass filter assembly includes a pole resonator and a low-pass resonator, the low-pass filter cavity including multiple interconnected pole resonator cavities and multiple low-pass resonator cavities, the pole resonator including multiple pole resonator units, each pole resonator unit being disposed within a pole resonator cavity; the low-pass resonator including multiple low-pass resonator units, each low-pass resonator unit being disposed within a low-pass resonator cavity, each pole resonator unit being electrically connected to a low-pass resonator unit, the filter input terminal and the filter output terminal being electrically connected to a low-pass resonator unit respectively, the low-pass resonator unit including a resonator base and a resonator metal pillar, the resonator base being connected to the bottom of the low-pass resonator cavity, the resonator base having a passband groove, and a portion of the resonator metal pillar being movably disposed within the passband groove.
[0007] In one embodiment, the resonant base includes a base and two resonant baffles. The base is connected to the bottom of the low-pass resonant cavity, and both resonant baffles are connected to the side of the base opposite to the bottom of the low-pass resonant cavity. A passband groove is formed between the two resonant baffles.
[0008] In one embodiment, the distance between the resonant metal pillar and the two resonant baffles is equal.
[0009] In one embodiment, the two resonant baffles are arranged parallel to each other.
[0010] In one embodiment, the resonant base further includes an insulating dielectric pad disposed within the passband groove, and the insulating dielectric pad is connected to both the base and the resonant metal pillar.
[0011] In one embodiment, the resonant metal pillar includes interconnected resonant pillars and a resonant disk, the resonant pillars being located between the two resonant baffles, the resonant pillars being connected to the base, and the resonant disks being located on the side of the resonant pillars away from the base.
[0012] In one embodiment, the diameter of the resonant disk is larger than the diameter of the base.
[0013] In one embodiment, the resonant column has a fixing through hole for inserting a fixing screw.
[0014] In one embodiment, the low-pass filter component further includes two coaxial lines, and the filter input terminal and the filter output terminal are respectively electrically connected to the corresponding low-pass resonator through one of the coaxial lines.
[0015] A communication device includes the low-frequency anti-interference filter described in any of the above embodiments.
[0016] Compared with the prior art, this disclosure has at least the following advantages:
[0017] After the resonant base is installed on the bottom of the low-pass resonator cavity, part of the resonant metal pillar is movably positioned in the passband groove, allowing the resonant metal pillar to move within the passband groove. This makes the distance between the resonant metal pillar and the resonant base adjustable, thereby making the filter capacitor formed on the low-pass resonant unit adjustable. This facilitates the suppression of different passbands and improves out-of-band suppression capability. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of a low-frequency anti-interference filter in one embodiment;
[0020] Figure 2 for Figure 1 The diagram shows the internal structure of a low-frequency anti-interference filter.
[0021] Figure 3 for Figure 2 The diagram shows an enlarged view of the low-frequency anti-interference filter at point A1. Detailed Implementation
[0022] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.
[0023] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0025] This disclosure relates to a low-frequency anti-interference filter. In one embodiment, the low-frequency anti-interference filter includes a filter housing and a low-pass filter assembly. The filter housing includes a housing, a filter input terminal, and a filter output terminal. The housing has a low-pass filter cavity, and the filter input terminal and the filter output terminal are both connected to the outer wall of the housing. The low-pass filter assembly includes a pole resonator and a low-pass resonator. The low-pass filter cavity includes multiple interconnected pole resonator cavities and multiple low-pass resonator cavities. The pole resonator includes multiple pole resonator units, each pole resonator unit being disposed within a pole resonator cavity. The low-pass resonator includes multiple low-pass resonator units, each low-pass resonator unit being disposed within a low-pass resonator cavity. Each pole resonator unit is electrically connected to a low-pass resonator unit. The filter input terminal and the filter output terminal are respectively electrically connected to a low-pass resonator unit. The low-pass resonator unit includes a resonant base and a resonant metal pillar. The resonant base is connected to the bottom of the low-pass resonator cavity. The resonant base has a passband groove, and a portion of the resonant metal pillar is movably disposed within the passband groove. After the resonant base is installed on the bottom of the low-pass resonator cavity, part of the resonant metal pillar is movably positioned in the passband groove, allowing the resonant metal pillar to move within the passband groove. This makes the distance between the resonant metal pillar and the resonant base adjustable, thereby making the filter capacitor formed on the low-pass resonant unit adjustable. This facilitates the suppression of different passbands and improves out-of-band suppression capability.
[0026] Please see Figure 1 This is a schematic diagram of the structure of a low-frequency anti-interference filter according to an embodiment of the present disclosure.
[0027] One embodiment of the low-frequency anti-interference filter 10 includes a filter housing 100 and a low-pass filter component 200. Please refer to the following: Figure 2The filter housing 100 includes a housing 110, a filter input terminal 120, and a filter output terminal 130. The housing 110 has a low-pass filter cavity, and both the filter input terminal 120 and the filter output terminal 130 are connected to the outer wall of the housing 110. The low-pass filter assembly 200 includes a pole resonator 210 and a low-pass resonator 220. The low-pass filter cavity includes a plurality of interconnected pole resonator cavities 102 and a plurality of low-pass resonator cavities 104. The pole resonator 210 includes a plurality of pole resonator units 212, and each pole resonator unit 212 is disposed within a pole resonator cavity 102. The low-pass resonator 220 includes a plurality of low-pass resonant units 222, each of which is disposed within a low-pass resonator cavity 104. Each pole resonant unit 212 is electrically connected to a low-pass resonant unit 222. The filter input terminal 120 and the filter output terminal 130 are respectively electrically connected to a low-pass resonant unit 222. The low-pass resonant unit 222 includes a resonant base 2222 and a resonant metal pillar 2224. The resonant base 2222 is connected to the bottom of the low-pass resonator cavity 104. The resonant base 2222 has a passband groove 202, and a portion of the resonant metal pillar 2224 is movably disposed within the passband groove 202.
[0028] In this embodiment, after the resonant base 2222 is installed on the bottom of the low-pass resonator cavity 104, a portion of the resonant metal pillar 2224 is movably disposed within the passband groove 202, allowing the resonant metal pillar 2224 to move within the passband groove 202. This makes the distance between the resonant metal pillar 2224 and the resonant base 2222 adjustable, thereby making the filter capacitor formed on the low-pass resonant unit 222 adjustable, which facilitates the suppression of different passbands and improves the out-of-band suppression capability.
[0029] In one embodiment, please refer to Figure 3 The resonant base 2222 includes a base 2222a and two resonant baffles 2222b. The base 2222a is connected to the bottom of the low-pass resonant cavity 104, and the two resonant baffles 2222b are each connected to the side of the base 2222a opposite to the bottom of the low-pass resonant cavity 104. A passband groove 202 is formed between the two resonant baffles 2222b. In this embodiment, the base 2222a serves as the mounting base for the two resonant baffles 2222b, and the two resonant baffles 2222b serve as the two sidewalls of the passband groove 202, making the position between the resonant baffles 2222b and the resonant column adjustable. For example, the distance between the resonant metal column 2224 and the two resonant baffles 2222b is equal, thereby making the low-pass resonant frequency corresponding to the low-pass resonant unit 222 adjustable.
[0030] In another embodiment, the two resonant baffles 2222b are arranged parallel to each other. In this embodiment, the resonant baffles 2222b serve as the sidewalls of the passband groove 202, and the distance between the two parallel resonant baffles 2222b and the resonant pillar remains adjustable, facilitating precise adjustment of the capacitance value of the filter capacitor corresponding to the low-pass resonant unit 222.
[0031] In one embodiment, please refer to Figure 3 The resonant base 2222 further includes an insulating dielectric pad 2222c, which is disposed within the passband groove 202. The insulating dielectric pad 2222c is connected to both the base 2222a and the resonant metal pillar 2224. In this embodiment, the insulating dielectric pad 2222c is located within the passband groove 202 and between the base 2222a and the resonant metal pillar 2224. The insulating dielectric pad 2222c serves as the filter capacitor dielectric between the base 2222a and the resonant metal pillar 2224, facilitating the adjustment of the filter capacitor corresponding to the low-pass resonant unit 222, thereby facilitating the adjustment of the low-pass resonant frequency corresponding to the low-pass resonant unit 222.
[0032] In one embodiment, please refer to Figure 3 The resonant metal pillar 2224 includes a resonant pillar 2224a and a resonant disk 2224b connected to each other. The resonant pillar 2224a is located between the two resonant baffles 2222b and is connected to the base 2222a. The resonant disk 2224b is located on the side of the resonant pillar 2224a away from the base 2222a. In this embodiment, the resonant pillar 2224a is connected to both the base 2222a and the resonant disk 2224b. The resonant pillar 2224a is located within the passband groove 202, and the resonant disk 2224b is located outside the passband groove 202. This facilitates moving the resonant disk 2224b away from the resonant baffles 2222b, thereby forming a new filter capacitor between the resonant baffles 2222b and the resonant disk 2224b to achieve adjustable low-pass resonant frequency.
[0033] Furthermore, the diameter of the resonant disk 2224b is larger than the diameter of the base 2222a. In this embodiment, the resonant disk 2224b and the resonant pillar 2224a form a "T"-shaped structure. This facilitates the installation of the resonant pillar 2224a into the passband groove 202 and increases the filter capacitor corresponding to the low-pass resonant unit 222, thereby improving the out-of-band suppression effect.
[0034] In another embodiment, the resonant column 2224a has a fixing through hole 204 for inserting a fixing screw. The fixing through hole 204 serves as a connection hole between the resonant column 2224a and the base 2222a, facilitating the installation of the fixing screw.
[0035] In one embodiment, please refer to Figure 2 The low-pass filter component 200 further includes two coaxial cables 230. The filter input terminal 120 and the filter output terminal 130 are electrically connected to the corresponding low-pass resonator 220 via one of the coaxial cables 230. In this embodiment, the filter input terminal 120 serves as the input terminal of the low-pass filtered signal. The filter input terminal 120 guides the signal through the coaxial cable 230 to reduce input loss and facilitate precise filtering. The filter output terminal 130 serves as the output terminal of the low-pass filtered signal. The filter output terminal 130 guides the signal through the coaxial cable 230 to reduce output loss and facilitate precise output of the filtered signal.
[0036] In one embodiment, this disclosure also relates to a communication device including the low-frequency anti-interference filter described in any of the above embodiments. In this embodiment, the low-frequency anti-interference filter includes a filter housing and a low-pass filter assembly. The filter housing includes a housing, a filter input terminal, and a filter output terminal. The housing has a low-pass filter cavity, and the filter input terminal and the filter output terminal are both connected to the outer wall of the housing. The low-pass filter assembly includes a pole resonator and a low-pass resonator. The low-pass filter cavity includes multiple interconnected pole resonator cavities and multiple low-pass resonator cavities. The pole resonator includes multiple pole resonator units, each pole resonator unit being disposed within a pole resonator cavity. The low-pass resonator includes multiple low-pass resonator units, each low-pass resonator unit being disposed within a low-pass resonator cavity. Each pole resonator unit is electrically connected to a low-pass resonator unit. The filter input terminal and the filter output terminal are respectively electrically connected to a low-pass resonator unit. The low-pass resonator unit includes a resonant base and a resonant metal pillar. The resonant base is connected to the bottom of the low-pass resonator cavity. The resonant base has a passband groove, and a portion of the resonant metal pillar is movably disposed within the passband groove. After the resonant base is installed on the bottom of the low-pass resonator cavity, part of the resonant metal pillar is movably positioned in the passband groove, allowing the resonant metal pillar to move within the passband groove. This makes the distance between the resonant metal pillar and the resonant base adjustable, thereby making the filter capacitor formed on the low-pass resonant unit adjustable. This facilitates the suppression of different passbands and improves out-of-band suppression capability.
[0037] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent disclosure. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent disclosure should be determined by the appended claims.
Claims
1. A low-frequency anti-interference filter, characterized in that, include: A filter housing includes a housing, filter input terminals, and filter output terminals. The housing has a low-pass filter cavity, and both the filter input terminals and the filter output terminals are connected to the outer wall of the housing. A low-pass filter assembly includes a pole resonator and a low-pass resonator. The low-pass filter cavity includes multiple interconnected pole resonator cavities and multiple low-pass resonator cavities. The pole resonator includes multiple pole resonator units, each pole resonator unit being disposed within a pole resonator cavity. The low-pass resonator includes multiple low-pass resonator units, each low-pass resonator unit being disposed within a low-pass resonator cavity. Each pole resonator unit is electrically connected to a low-pass resonator unit. The filter input terminal and the filter output terminal are respectively electrically connected to a low-pass resonator unit. The low-pass resonator unit includes a resonant base and a resonant metal pillar. The resonant base is connected to the bottom of the low-pass resonator cavity. The resonant base has a passband groove, and a portion of the resonant metal pillar is movably disposed within the passband groove.
2. The low-frequency anti-interference filter according to claim 1, characterized in that, The resonant base includes a base and two resonant baffles. The base is connected to the bottom of the low-pass resonant cavity, and the two resonant baffles are connected to the side of the base away from the bottom of the low-pass resonant cavity. A passband groove is formed between the two resonant baffles.
3. The low-frequency anti-interference filter according to claim 2, characterized in that, The distance between the resonant metal pillar and the two resonant baffles is equal.
4. The low-frequency anti-interference filter according to claim 2, characterized in that, The two resonant baffles are arranged parallel to each other.
5. The low-frequency anti-interference filter according to claim 2, characterized in that, The resonant base also includes an insulating dielectric pad, which is disposed in the passband groove and is connected to the base and the resonant metal column respectively.
6. The low-frequency anti-interference filter according to claim 2, characterized in that, The resonant metal column includes interconnected resonant columns and resonant disks. The resonant columns are located between the two resonant baffles and are connected to the base. The resonant disks are located on the side of the resonant columns away from the base.
7. The low-frequency anti-interference filter according to claim 6, characterized in that, The diameter of the resonant disk is larger than the diameter of the base.
8. The low-frequency anti-interference filter according to claim 6, characterized in that, The resonant column has a fixing through hole for inserting a fixing screw.
9. The low-frequency anti-interference filter according to claim 1, characterized in that, The low-pass filter component also includes two coaxial lines, and the filter input terminal and the filter output terminal are respectively electrically connected to the corresponding low-pass resonator through one of the coaxial lines.
10. A communication device, characterized in that, Includes a low-frequency anti-interference filter as described in any one of claims 1 to 9.