CN216793958U - Low-pass filter and communication device - Google Patents
Low-pass filter and communication device Download PDFInfo
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- CN216793958U CN216793958U CN202123454575.5U CN202123454575U CN216793958U CN 216793958 U CN216793958 U CN 216793958U CN 202123454575 U CN202123454575 U CN 202123454575U CN 216793958 U CN216793958 U CN 216793958U
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Abstract
The utility model relates to the technical field of filters, and provides a low-pass filter and communication equipment. Signals transmitted on the main metal strip line are filtered by the aid of the quarter-wavelength metal strip lines, so that the filtered signals can meet preset performance indexes, and stop band rejection capability is improved. The low-pass filter has good high-frequency suppression performance.
Description
Technical Field
The utility model relates to the technical field of filters, and particularly provides a low-pass filter and communication equipment with the low-pass filter.
Background
A low-pass filter is an electronic filtering device that allows signals below a cutoff frequency to pass, but does not allow signals above the cutoff frequency to pass.
The conventional low-pass filter realizes high-frequency suppression by high-low impedance change. However, the requirements for the thickness processing precision of the metal connecting sheet, the outer conductor and the medium in the low-pass filter are higher, namely, the processing error can seriously affect the suppression performance of the filter, and meanwhile, the cost is inevitably increased due to the processing requirement of high precision. Therefore, it is necessary to solve the problem that the conventional low-pass filter has a poor high-frequency suppression effect.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a low-pass filter, aiming at solving the problem that the conventional low-pass filter has poor high-frequency suppression effect.
In order to achieve the purpose, the utility model adopts the technical scheme that:
in a first aspect, an embodiment of the present invention provides a low-pass filter, which includes an outer conductor having a signal input end and a signal output end, a main metal strip line and a plurality of quarter-wavelength metal strip lines, and two load impedances, where one end of the main metal strip line is connected to the signal input end through one of the load impedances, and the other end of the main metal strip line is connected to the signal output end through the other of the load impedances, and each of the quarter-wavelength metal strip lines is connected to the main metal strip line at intervals.
The utility model has the beneficial effects that: the low-pass filter utilizes the plurality of quarter-wavelength metal strip lines to filter signals transmitted on the main metal strip line, so that the filtered signals can meet preset performance indexes, and the stop band inhibition capability is improved. Specifically, the opposite ends of the main metal strip line are connected with the signal input end and the signal output end of the outer conductor through corresponding load impedances, that is, an external signal source enters from the signal input end of the outer conductor, passes through the transmission of the main metal strip line and the filtering of each quarter-wavelength metal strip line, and then flows out from the signal output end of the outer conductor. Therefore, the low-pass filter of the present application has good high-frequency rejection performance.
In one embodiment, the low pass filter includes a dielectric through which the outer conductor is connected to the main metal strip line and the quarter wavelength metal strip line.
In one embodiment, the main metal strip line and the quarter wave metal strip line are injection molded integrally with the medium.
In one embodiment, each of the quarter-wave metal strip lines is disposed on the same side of the main metal strip line.
In one embodiment, each of the quarter-wave metal striplines is disposed on opposite sides of the main metal stripline.
In one embodiment, the quarter-wave metal strip lines on opposite sides of the main metal strip line are aligned;
or at least one of the quarter-wave metal strip lines on opposite sides of the main metal strip line is misaligned.
In one embodiment, the middle line of the quarter-wave metal strip line is at an angle with the main metal strip line.
In one embodiment, the outer conductor is a metal shell having an accommodating space, the medium is wrapped outside the main metal strip line and each of the quarter-wavelength metal strip lines, and the medium, the main metal strip line and each of the quarter-wavelength metal strip lines are disposed in the accommodating space.
In one embodiment, the outer conductor is a metal block, the metal block is provided with a containing groove, and the medium is arranged on two opposite sides of the main metal strip line and each quarter-wavelength metal strip line.
In a second aspect, the present application further provides a communication device comprising the low-pass filter described above.
The utility model has the beneficial effects that: the communication device of the present invention can obtain stable low and intermediate frequency signals on the basis of the low pass filter.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a front view of a low-pass filter according to a first embodiment of the utility model;
FIG. 2 is a cross-sectional view of a low-pass filter according to a second embodiment of the present invention;
FIG. 3 is a front view of a main metal strip line and a quarter-wave metal strip line of a low-pass filter provided by an embodiment of the utility model;
FIG. 4 is another front view of the main metal stripline and quarter wave metal stripline of the low pass filter provided by the embodiment of the utility model;
FIG. 5 is a further front view of the main metal stripline and quarter wave metal stripline of the low pass filter provided by the embodiment of the utility model;
FIG. 6 is a further front view of the main metal stripline and quarter wave metal stripline of the low pass filter provided by the embodiment of the utility model;
FIG. 7 is another two front views of the main metal strip line and the quarter-wave metal strip line of the low-pass filter according to the embodiment of the present invention;
fig. 8 is a simulation data diagram of a low-pass filter according to an embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
100. a low-pass filter;
10. an outer conductor; 10a, a signal input end; 10b, a signal output end; 20. a main metal strip line; 30. a quarter-wavelength metal strip line; 40. a load impedance; 50. a medium.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, a low pass filter 100 according to an embodiment of the present invention includes an outer conductor 10, a main metal strip line 20, a plurality of quarter-wavelength metal strip lines 30, and two load impedances 40.
Here, the outer conductor has a signal input end and a signal output end, and the shape and structure of the outer conductor 10 are not limited and can be adjusted according to actual use requirements. The material of the outer conductor 10 may be silver, copper, aluminum, titanium, gold, or other metal material. Preferably, the outer conductor 10 is made of silver.
Illustratively, the outer conductor 10 is a metal housing having a receiving cavity, and the main metal strip line 20, the plurality of quarter-wave metal strip lines 30 and the two load impedances 40 are disposed in the receiving cavity.
Illustratively, the outer conductor 10 is a metal block, a groove structure is formed in the middle of the metal block, and the main metal strip line 20, the plurality of quarter-wavelength metal strip lines 30, and the two load impedances 40 are all disposed in the groove structure.
Specifically, the outer conductor 10 has a signal input terminal and a signal output terminal. The signal input end is used for accessing a signal source to be filtered, and the signal after filtering flows out from the signal end.
A main metal strip line 20 and a plurality of quarter-wave metal strip lines 30 and two load impedances 40 are provided in the outer conductor 10. Here, the external signal source is transmitted on the main metal strip line 20 after entering the outer conductor 10, and the signal on the main metal strip line 20 is filtered by the respective quarter-wavelength metal strip lines 30. The load impedance 40 prevents signal energy loss and improves energy efficiency.
Specifically, one end of the main metal strip line 20 is connected to the signal input terminal through one load impedance 40 and the other end is connected to the signal output terminal through another load impedance 40, and each quarter-wavelength metal strip line 30 is connected to the main metal strip line 20 at intervals. Here, the number of the quarter-wavelength metal strip lines 30 is at least two, and the number of the quarter-wavelength metal strip lines 30 is increased according to the actual use requirement, for example, the number of the quarter-wavelength metal strip lines 30 may be four, eight, or twelve.
The distribution of the quarter-wave metal strip lines 30 on the main metal strip line 20 is determined by the following conditions:
illustratively, each quarter-wave metal strip line 30 is located on one side of the main metal strip line 20. The spacing and length between each quarter-wave metal strip line 30 may be selected according to the actual use requirements.
Alternatively, the quarter-wave metal strip lines 30 are illustratively distributed on opposite sides of the main metal strip line 20. In this way, the quarter wave metal strip lines 30 on opposite sides of the main metal strip line 20 may remain fully aligned, or the quarter wave metal strip lines 30 on opposite sides of the main metal strip line 20 may remain fully misaligned, or the quarter wave metal strip lines 30 on opposite sides of the main metal strip line 20 may be only partially misaligned. Similarly, the distance and length between each quarter-wave metal strip line 30 can be selected according to the actual use requirement, and the number of the quarter-wave metal strip lines 30 on the same side can be increased or decreased.
The low pass filter 100 of the present invention utilizes the plurality of quarter-wavelength metal strip lines 30 to filter the signals transmitted on the main metal strip line 20, so that the filtered signals can meet the preset performance index, and the stop band rejection capability is improved. Specifically, the opposite ends of the main metal strip line 20 are connected to the signal input end and the signal output end of the outer conductor 10 through the corresponding load impedances 40, that is, an external signal source enters from the signal input end of the outer conductor 10, passes through the transmission of the main metal strip line 20 and the filtering of each quarter-wave metal strip line 30, and then exits from the signal output end of the outer conductor 10. Therefore, the low-pass filter 100 of the present application has good high-frequency rejection performance.
Referring to fig. 1 and 2, in one embodiment, the low pass filter 100 includes a dielectric 50, and the outer conductor 10 is connected to the main metal strip line 20 and the quarter wavelength metal strip line 30 through the dielectric 50. Here, the material of the medium 50 is not limited, and the medium 50 may be rubber, plastic, or the like, which can perform an insulating function, for example.
In one embodiment, primary metal striplines 20 and quarter wave metal striplines 30 are integrally injection molded with dielectric 50. In this embodiment, the medium is made of plastic. Specifically, the main metal strip line 20 and the quarter-wavelength metal strip line 30 are processed and plastically packaged for one-time processing and forming, so that the processing efficiency is greatly improved, and the production cost is reduced; and the fine processing of the main metal strip line 20 and the quarter-wavelength metal strip line 30 can improve the performance stability of the low-pass filter, so as to improve the overall performance stability of the radio frequency device, and simultaneously achieve the goals of miniaturization and light weight.
Referring to fig. 3, in one embodiment, each quarter-wave metal strip line 30 is disposed on the same side of the main metal strip line 20. Here, the spacing between the quarter-wave metal strip lines 30, the length and width thereof, may be adjusted according to the actual filtering needs.
Preferably, as shown in fig. 3, four quarter-wave metal strip lines 30 are provided on the same side of the main metal strip line 20, and the spacing between each quarter-wave metal strip line 30 is equal, and the length of the quarter-wave metal strip line 30 in the head-to-tail position is longer and the width of the quarter-wave metal strip line 30 in the middle position is wider.
Referring to fig. 4-7, in one embodiment, the quarter-wave metal strip lines 30 are disposed on two opposite sides of the main metal strip line 20. Here, the spacing between the quarter-wave metal strip lines 30, the length and width of the quarter-wave metal strip lines 30, and the quarter-wave metal strip lines 30 on the same side can be adjusted according to the actual filtering requirements.
Preferably, as shown in fig. 5, four quarter-wave metal strip lines 30 are provided on one side of the main metal strip line 20. On this side, the spacing between each quarter-wave metal strip line 30 is equal, and the length of the quarter-wave metal strip line 30 in the head-to-tail position is longer, while the width of the quarter-wave metal strip line 30 in the middle position is wider; three quarter-wave metal strip lines 30 are provided on the other side of the main metal strip line 20. On this side, the spacing between each quarter-wave metal strip line 30 is equal, and the length of the quarter-wave metal strip line 30 in the head-to-tail position is longer, while the width of the quarter-wave metal strip line 30 in the middle position is wider.
Specifically, when the quarter-wave metal strip lines 30 are disposed on two opposite sides of the main metal strip line 20, the quarter-wave metal strip lines 30 may be arranged as follows:
first, the quarter-wave metal strip lines 30 on opposite sides of the main metal strip line 20 are aligned one-to-one. Here. By aligned is meant that the middle lines of the quarter wave metal strip lines 30 on opposite sides coincide.
Specifically, as shown in fig. 4, four quarter-wavelength metal strip lines 30 are disposed on opposite sides of the main metal strip line 20, and the central lines of each of the quarter-wavelength metal strip lines 30 coincide.
Second, at least one quarter-wavelength metal strip line 30 located at opposite sides of the main metal strip line 20 is misaligned. Here, there are two categories, one is that the quarter-wavelength metal strip lines 30 located at opposite sides of the main metal strip line 20 are completely dislocated; the other is that the portions of the quarter-wave metal strip line 30 on opposite sides of the main metal strip line 20 are offset. The above conditions are selected according to actual use requirements.
Specifically, as shown in fig. 6, three quarter-wavelength metal strip lines 30 are disposed on opposite sides of the main metal strip line 20, and the quarter-wavelength metal strip lines 30 are alternately disposed in a staggered manner along the extending direction of the main metal strip line 20.
Alternatively, as shown in fig. 7, three quarter-wavelength metal strip lines 30 are disposed on opposite sides of the main metal strip line 20, wherein the middle lines of the quarter-wavelength metal strip lines 30 at the middle positions are overlapped, and the quarter-wavelength metal strip lines 30 at the rest positions are staggered.
Referring to fig. 3, in one embodiment, the middle line of each quarter-wavelength metal strip line 30 forms an angle with the main metal strip line 20, and the angle of each angle can be adjusted according to actual requirements. For example, the included angle may be 10 °, 30 °, 45 °, 60 °, 90 °, 120 °, 135 °, and so forth. Of course, other non-integer angles are possible, such as 10.1 °, 45.03 °, and the like.
Preferably, as shown in fig. 3, one end of each quarter-wavelength metal strip line 30 is vertically connected to the main metal strip line 20.
In one embodiment, the other end of each quarter-wave metal strip line 30 is connected to the outer conductor 10. It is understood that a connection point may be provided at a corresponding position of the outer conductor 10, and the other end of each quarter-wavelength metal strip line 30 is connected to the corresponding connection point by a connector such as a screw.
In one embodiment, the outer conductor 10 is a metal shell having a receiving space, the medium 50 is wrapped outside the main metal strip line 20 and each quarter-wavelength metal strip line 30, and the medium 50, the main metal strip line 20 and each quarter-wavelength metal strip line 30 are disposed in the receiving space. It will be appreciated that the medium 50 may be in-molded around the outside of the main metal strip line 20 and the quarter wave metal strip lines 30, which is more efficient and protective.
In one embodiment, the outer conductor 10 is a metal block with a receiving slot, and the dielectric 50 is disposed on two opposite sides of the main metal strip line 20 and each quarter-wavelength metal strip line 30. It will be appreciated that the medium 50 may be disposed in a bonded manner on opposite sides of the main metal stripline 20 and the quarter wave metal striplines 30.
As shown in fig. 3, in one embodiment, four quarter-wave metal strip lines 30 are disposed on the same side of the main metal strip line 20, wherein the first and last quarter-wave metal strip lines 30 are longer in length, the middle two quarter-wave metal strip lines 30 are wider in width, and each quarter-wave metal strip line 30 is perpendicular to the main metal strip line 20. On the basis of the above structure, the simulation obtains the data result as shown in fig. 8, further illustrating that the low pass filter 100 has good high frequency suppression performance.
In a second aspect, the present application further provides a communication device, which includes the low-pass filter 100 described above.
The communication device of the present invention, having the low-pass filter 100, can obtain stable low and intermediate frequency signals.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A low pass filter, characterized by: the load impedance matching circuit comprises an outer conductor with a signal input end and a signal output end, a main metal strip line, a plurality of quarter-wavelength metal strip lines and two load impedances, wherein the main metal strip line and the quarter-wavelength metal strip lines are arranged in the outer conductor, one end of the main metal strip line is connected to the signal input end through one load impedance, the other end of the main metal strip line is connected to the signal output end through the other load impedance, and each quarter-wavelength metal strip line is connected to the main metal strip line at intervals.
2. A low-pass filter as claimed in claim 1, characterized in that: the low pass filter includes a dielectric through which the outer conductor is connected to the main metal strip line and the quarter wavelength metal strip line.
3. A low-pass filter as claimed in claim 2, characterized in that: the main metal strip line and the quarter-wavelength metal strip line are integrally injection-molded with the medium.
4. A low-pass filter as claimed in claim 1, characterized in that: each quarter-wavelength metal strip line is arranged on the same side of the main metal strip line.
5. A low-pass filter as claimed in claim 1, characterized in that: each quarter-wavelength metal strip line is arranged on two opposite sides of the main metal strip line.
6. A low-pass filter as claimed in claim 4, characterized in that: the quarter-wavelength metal strip lines on opposite sides of the main metal strip line are aligned;
or at least one of the quarter-wave metal strip lines on opposite sides of the main metal strip line is misaligned.
7. A low-pass filter as claimed in claim 4 or 5, characterized in that: an included angle is formed between the middle line of the quarter-wavelength metal strip line and the main metal strip line.
8. A low-pass filter as claimed in claim 2, characterized in that: the outer conductor is a metal shell with an accommodating space, the medium is wrapped on the outer sides of the main metal strip line and the quarter-wavelength metal strip lines, and the medium, the main metal strip line and the quarter-wavelength metal strip lines are arranged in the accommodating space.
9. A low-pass filter as claimed in claim 2, characterized in that: the outer conductor is a metal block, a containing groove is formed in the metal block, and the medium is arranged on two opposite sides of the main metal strip line and the quarter-wavelength metal strip lines.
10. A communication device, characterized by: comprising a low-pass filter according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123454575.5U CN216793958U (en) | 2021-12-31 | 2021-12-31 | Low-pass filter and communication device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123454575.5U CN216793958U (en) | 2021-12-31 | 2021-12-31 | Low-pass filter and communication device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216793958U true CN216793958U (en) | 2022-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123454575.5U Active CN216793958U (en) | 2021-12-31 | 2021-12-31 | Low-pass filter and communication device |
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|---|---|
| CN (1) | CN216793958U (en) |
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- 2021-12-31 CN CN202123454575.5U patent/CN216793958U/en active Active
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