Topological structure, filter and communication equipment
By designing a new topology structure including symmetrical parallel lines and short-circuited branches, the problem of insufficient selectivity of broadband bandpass filters is solved, and a signal transmission effect with high selectivity and low noise is achieved.
Patent Information
- Application Number
- CN202422664096.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-10-31
AI Technical Summary
Existing broadband bandpass filters lack high selectivity, resulting in degraded signal transmission quality and increased noise.
A topology structure is designed, including an input end, an output end, parallel lines, first and second parallel lines, and symmetrical first and second short-circuit branches. Through the symmetry and coupling relationship of these components, the balance of the signal transmission path and the control of the electromagnetic field distribution are enhanced to achieve high selectivity.
It improves the signal transmission quality, reduces noise, and enhances the selectivity and suppression ability of the filter within a specific frequency range.
Smart Images
Figure CN223427747U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The embodiment of the utility model relates to communication technical field, especially a kind of topology structure and filter. BACKGROUND
[0002] In order to solve the contradiction between limited spectrum resources and increasing information transmission needs, researchers have developed radio frequency systems that can work in different frequency ranges and communication modes to more efficiently utilize spectrum resources. In the above radio frequency system, a wideband bandpass filter with high selectivity is one of the keys.
[0003] During the implementation of the present application, the inventors have found that: at present, the wideband bandpass filter does not have high selectivity (high selectivity means that the filter can allow signals to pass through within a specific frequency range while suppressing signals in other frequency ranges), which results in the wideband bandpass filter being unable to suppress signals in other frequency ranges, causing the signal transmission quality to decrease and increasing noise. UTILITY MODEL CONTENT
[0004] The technical problem solved by the embodiments of the utility model is to provide a topology structure, a filter and a communication device that can have high selectivity, improve signal transmission quality and reduce noise.
[0005] To solve the above technical problem, one technical scheme adopted by the embodiments of the utility model is to provide a topology structure, comprising an input end, an output end, a parallel line, a first parallel three-line, a second parallel three-line, a first short-circuit stub and a second short-circuit stub; one end of the parallel line is connected to one end of the first parallel three-line and one end of the first short-circuit stub, the other end of the first parallel three-line is connected to the input end, the other end of the first short-circuit stub is used for grounding, the other end of the parallel line is connected to one end of the second parallel three-line and one end of the second short-circuit stub, the other end of the second parallel three-line is connected to the output end, and the other end of the second short-circuit stub is used for grounding; wherein the first parallel three-line and the second parallel three-line, the first short-circuit stub and the second short-circuit stub are symmetrical about the parallel line.
[0006] In some embodiments, the parallel line, the first short-circuit stub and the second short-circuit stub are parallel to each other and perpendicular to the first parallel three-line and the second parallel three-line.
[0007] In some embodiments, the electrical length of the parallel line, the electrical length of the first parallel three-line, the electrical length of the second parallel three-line, the electrical length of the first short-circuit stub and the electrical length of the second short-circuit stub are equal.
[0008] In some embodiments, the electrical length of the parallel line, the electrical length of the first parallel tri-line, the electrical length of the second parallel tri-line, the electrical length of the first short-circuit stub, and the electrical length of the second short-circuit stub are all equal to a corresponding quarter wavelength at a center frequency of the bandpass filter.
[0009] In some embodiments, the characteristic impedance of the first short-circuit stub and the characteristic impedance of the second short-circuit stub are equal.
[0010] In some embodiments, the parallel line includes a first conductor and a second conductor, one end of the first conductor is connected to one end of the first short-circuit stub, the other end of the first conductor is spaced opposite to one end of the second short-circuit stub, one end of the second conductor is spaced opposite to one end of the first short-circuit stub, the other end of the second conductor is connected to one end of the second short-circuit stub, the first conductor and the second conductor are spaced parallel to each other, and the first conductor and the second conductor are coupled.
[0011] In some embodiments, the first parallel tri-line includes a third conductor, a fourth conductor, and a fifth conductor, one end of the third conductor is spaced opposite to one end of the first short-circuit stub, the other end of the third conductor is connected to the input terminal, one end of the fourth conductor is connected to one end of the first short-circuit stub, the other end of the fourth conductor is spaced opposite to the input terminal, one end of the fifth conductor is spaced opposite to one end of the first short-circuit stub, the other end of the fifth conductor is connected to the input terminal, the third conductor, the fourth conductor, and the fifth conductor are sequentially and spaced parallel to each other, and the third conductor, the fourth conductor, and the fifth conductor are coupled; the second parallel tri-line includes a sixth conductor, a seventh conductor, and an eighth conductor, one end of the sixth conductor is spaced opposite to one end of the second short-circuit stub, the other end of the sixth conductor is connected to the output terminal, one end of the seventh conductor is connected to one end of the second short-circuit stub, the other end of the seventh conductor is spaced opposite to the output terminal, one end of the eighth conductor is spaced opposite to one end of the second short-circuit stub, the other end of the eighth conductor is connected to the output terminal, the sixth conductor, the seventh conductor, and the eighth conductor are sequentially and spaced parallel to each other, and the sixth conductor, the seventh conductor, and the eighth conductor are coupled.
[0012] In some embodiments, the length of the first short-circuit stub is greater than the length of the first parallel tri-line, and the length of the first parallel tri-line is equal to the length of the parallel line; the width of the first short-circuit stub is greater than the length of the first parallel tri-line, and the length of the first parallel tri-line is greater than the length of the parallel line.
[0013] To solve the above technical problems, another technical scheme adopted by the embodiments of the present application provides a filter including the above topology.
[0014] To solve the above technical problems, another technical scheme of the embodiment of the utility model also adopts: provide a kind of communication equipment, including above-mentioned filter.
[0015] The beneficial effects of the embodiment of the utility model are as follows: different from the prior art, the embodiment of the utility model provides a topology structure, which includes an input terminal, an output terminal, a parallel line, a first parallel three-wire, a second parallel three-wire, a first short-circuit stub, and a second short-circuit stub; one end of the parallel line is connected to one end of the first parallel three-wire and one end of the first short-circuit stub, respectively; the other end of the first parallel three-wire is connected to the input terminal; the other end of the first short-circuit stub is used for grounding; the other end of the parallel line is connected to one end of the second parallel three-wire and one end of the second short-circuit stub, respectively; the other end of the second parallel three-wire is connected to the output terminal; and the other end of the second short-circuit stub is used for grounding; wherein the first parallel three-wire and the second parallel three-wire, and the first short-circuit stub and the second short-circuit stub are symmetrical about the parallel line. In the above manner, the broadband band-pass filter designed based on the topology structure has high selectivity, which can improve the signal transmission quality and reduce noise. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical scheme in the specific embodiments of the utility model or the prior art, the drawings needed to be used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion.
[0017] Figure 1 is the overall structure schematic diagram of the topology structure provided by the embodiment of the utility model;
[0018] Figure 2 is the simulation structure schematic diagram of the topology structure provided by the embodiment of the utility model;
[0019] Figure 3 is the simulation S parameter result diagram of the topology structure provided by the embodiment of the utility model.
[0020] MARKING OF DRAWINGS:
[0021] 10 input terminal;
[0022] 20 output terminal;
[0023] 30 parallel line, 301 first conductor, 302 second conductor;
[0024] 40 first parallel three-wire, 401 third conductor, 402 fourth conductor, 403 fifth conductor;
[0025] 50 second parallel three-wire, 501 sixth conductor, 502 seventh conductor, 503 eighth conductor;
[0026] 60 first short-circuit branch;
[0027] 70 Second short-circuit branch;
[0028] 100 topologies. DETAILED DESCRIPTION
[0029] In order to facilitate the understanding of the present invention, the present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as being "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "upper", "lower", "inside", "outside", "vertical", "horizontal", etc. used in this specification indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0030] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this utility model belongs. The terms used in this specification and in the description of this utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model. The term "and / or" used in this specification includes any and all combinations of one or more of the relevant listed items.
[0031] To address the conflict between limited spectrum resources and the ever-increasing demand for information transmission, researchers have developed radio frequency systems capable of operating in different frequency ranges and communication modes to more efficiently utilize spectrum resources. In these radio frequency systems, highly selective broadband bandpass filters are a key component.
[0032] Currently, broadband bandpass filters do not have high selectivity (high selectivity means that the filter can allow signals within a specific frequency range to pass while suppressing signals in other frequency ranges), resulting in the broadband bandpass filter being unable to suppress signals in other frequency ranges, causing a decrease in signal transmission quality and an increase in noise.
[0033] In view of this, the present invention provides an embodiment of a topology structure 100. The broadband bandpass filter designed based on the topology structure 100 has high selectivity, can improve signal transmission quality, and reduce noise.
[0034] For the above topology 100, see Figure 1 and Figure 2 The topology structure 100 includes an input terminal 10, an output terminal 20, a parallel line 30, a first parallel three-line 40, a second parallel three-line 50, a first short-circuit branch 60 and a second short-circuit branch 70; one end of the parallel line 30 is respectively connected to one end of the first parallel three-line 40 and one end of the first short-circuit branch 60, the other end of the first parallel three-line 40 is connected to the input terminal 10, the other end of the first short-circuit branch 60 is used for grounding, the other end of the parallel line 30 is respectively connected to one end of the second parallel three-line 50 and one end of the second short-circuit branch 70, the other end of the second parallel three-line 50 is connected to the output terminal 20, and the other end of the second short-circuit branch 70 is used for grounding.
[0035] Specifically, the first three parallel lines 40 and the second three parallel lines 50, the first short-circuit branch 60 and the second short-circuit branch 70 are symmetrical about the parallel line 30, the parallel line 30, the first short-circuit branch 60 and the second short-circuit branch 70 are parallel to each other and are perpendicular to the first three parallel lines 40 and the second three parallel lines 50.
[0036] Through the above-described method, the first and second parallel three lines 40, 50, and the first and second short-circuit branches 60, 70 are all symmetrical about the parallel line 30, which can improve the balance of the signal transmission path and reduce the passage of out-of-band signals. In addition, the first and second short-circuit branches 60, 70 can provide a low-impedance path, allowing the filter to resonate at a specific frequency, enhancing the passage of desired frequency signals while suppressing the passage of unwanted frequency signals. The coupling effect of the parallel line 30, the first and second parallel three lines 40, 50 can enhance the control of the electromagnetic field distribution, allowing the filter to more accurately select desired frequency signals while suppressing unwanted frequency signals.
[0037] For the above-mentioned topological structure 100, in some embodiments, the electrical length of the parallel line 30, the electrical length of the first parallel three lines 40, the electrical length of the second parallel three lines 50, the electrical length of the first short-circuit branch 60, and the electrical length of the second short-circuit branch 70 are all equal, and the electrical length of the parallel line 30, the electrical length of the first parallel three lines 40, the electrical length of the second parallel three lines 50, the electrical length of the first short-circuit branch 60, and the electrical length of the second short-circuit branch 70 are all equal to one-quarter wavelength corresponding to the center frequency of the bandpass filter.
[0038] Through the above method, the resonant frequency of the filter designed based on the above topology structure 100 can be made consistent, reducing phase distortion and signal loss, thereby improving the selectivity of the filter designed based on the above topology structure 100 in a specific frequency band, thereby achieving high selectivity.
[0039] For the above topology structure 100, in some embodiments, the characteristic impedance of the first short-circuit stub 60 and the characteristic impedance of the second short-circuit stub 70 are equal.
[0040] In the above manner, the impedance matching and frequency response of the filter designed based on the above topology structure 100 are consistent, the reflection and unnecessary interference are reduced, and the high selectivity of the filter designed based on the above topology structure 100 is enhanced.
[0041] For the above parallel line 30, please refer to Figure 2 In some embodiments, the parallel line 30 includes a first conductor 301 and a second conductor 302, one end of the first conductor 301 is connected to one end of the first short-circuit stub 60, the other end of the first conductor 301 is spaced opposite to one end of the second short-circuit stub 70, one end of the second conductor 302 is spaced opposite to one end of the first short-circuit stub 60, the other end of the second conductor 302 is connected to one end of the second short-circuit stub 70, the first conductor 301 and the second conductor 302 are parallel and spaced, and the first conductor 301 and the second conductor 302 are coupled.
[0042] For the above first parallel three-line 40, please refer to Figure 2 In some embodiments, the first parallel three-line 40 includes a third conductor 401, a fourth conductor 402, and a fifth conductor 403, one end of the third conductor 401 is spaced opposite to one end of the first short-circuit stub 60, the other end of the third conductor 401 is connected to the input end 10, one end of the fourth conductor 402 is connected to one end of the first short-circuit stub 60, the other end of the fourth conductor 402 is spaced opposite to the input end 10, one end of the fifth conductor 403 is spaced opposite to one end of the first short-circuit stub 60, the other end of the fifth conductor 403 is connected to the input end 10, the third conductor 401, the fourth conductor 402, and the fifth conductor 403 are sequentially and parallel spaced, and the third conductor 401, the fourth conductor 402, and the fifth conductor 403 are coupled.
[0043] For the above second parallel three-line 50, please refer to Figure 2 In some embodiments, the second parallel three-line 50 includes a sixth conductor 501, a seventh conductor 502, and an eighth conductor 503, one end of the sixth conductor 501 is spaced opposite to one end of the second short-circuit stub 70, the other end of the sixth conductor 501 is connected to the output end 20, one end of the seventh conductor 502 is connected to one end of the second short-circuit stub 70, the other end of the seventh conductor 502 is spaced opposite to the output end 20, one end of the eighth conductor 503 is spaced opposite to one end of the second short-circuit stub 70, the other end of the eighth conductor 503 is connected to the output end 20, the sixth conductor 501, the seventh conductor 502, and the eighth conductor 503 are sequentially and parallel spaced, and the sixth conductor 501, the seventh conductor 502, and the eighth conductor 503 are coupled.
[0044] Regarding the first short-circuit branch 60 and the second short-circuit branch 70 , in some embodiments, the first short-circuit branch 60 and the second short-circuit branch 70 are both arranged structures of multiple conductors.
[0045] For the above-mentioned topological structure 100, in some embodiments, the length of the first short-circuit branch 60 is greater than the length of the first parallel three lines 40, and the length of the first parallel three lines 40 is equal to the length of the parallel lines 30; the width of the first short-circuit branch 60 is greater than the length of the first parallel three lines 40, and the length of the first parallel three lines 40 is greater than the length of the parallel lines 30, and the length and width of the first short-circuit branch 60 are equal to the length and width of the second short-circuit branch 70, and the length and width of the first parallel three lines 40 are equal to the length and width of the second parallel three lines 50.
[0046] To facilitate readers' understanding, the following simulation example of topology 100100 is provided:
[0047] See also Figure 2 The topology 100100 is set on a circuit board (not shown). The size of the circuit board (not shown) is 35.4mm*14.9mm, the thickness is 0.813mm, the dielectric constant is 3.38, and the dielectric loss is 0.0022. The specific parameters of the topology 100100 are: l1=11.2mm, l T =11.1mm, l p =11.1mm, w1=2.0mm, w T =0.2mm, w p =0.1mm,s T =0.1mm,s p =0.1mm. Please refer to Figure 3 The figure shows the results of a simulation experiment based on the above dimensions and parameters. The figure also shows the simulation results of the S parameters. Specifically, the passband range with a reflection coefficient better than -10dB is 2.00GHz-6.66GHz, the center frequency is 4.33GHz, the absolute bandwidth is 4.66GHz, and the relative bandwidth is 107.7%. In addition, there are seven transmission poles in the passband, located at 2.14GHz, 2.88GHz, 3.92GHz, 4.66GHz, 5.52GHz, 6.38GHz, and 6.56GHz, respectively. These seven transmission poles ensure the flatness of the passband; there are three transmission zeros in the stopband, located at 0GHz, 0.45GHz, and 7.4GHz, respectively. These three transmission zeros ensure the high selectivity of the filter designed based on this topology 100.
[0048] Through the simulation example of the above topology structure 100 , it can be proved that the broadband bandpass filter designed based on the above topology structure 100 has high selectivity.
[0049] The embodiment of the present invention provides a topology structure 100, including an input terminal 10, an output terminal 20, a parallel line 30, a first parallel three-wire 40, a second parallel three-wire 50, a first short-circuit branch 60, and a second short-circuit branch 70; one end of the parallel line 30 is respectively connected to one end of the first parallel three-wire 40 and one end of the first short-circuit branch 60, the other end of the first parallel three-wire 40 is connected to the input terminal 10, the other end of the first short-circuit branch 60 is used for grounding, the other end of the parallel line 30 is respectively connected to one end of the second parallel three-wire 50 and one end of the second short-circuit branch 70, the other end of the second parallel three-wire 50 is connected to the output terminal 20, and the other end of the second short-circuit branch 70 is used for grounding; wherein the first parallel three-wire 40 and the second parallel three-wire 50, the first short-circuit branch 60 and the second short-circuit branch 70 are all symmetrical about the parallel line 30. In this way, the broadband bandpass filter designed based on this topology structure 100 has high selectivity, can improve signal transmission quality, and reduce noise.
[0050] The present invention further provides an embodiment of a filter, which includes the above-mentioned topological structure 100. The specific structure and function of the above-mentioned topological structure 100 can be found in the above-mentioned embodiment, which will not be described in detail here.
[0051] The present invention further provides an embodiment of a communication device, which includes the above-mentioned filter. The specific structure and function of the above-mentioned filter can be found in the above-mentioned embodiment, which will not be described in detail here.
[0052] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A topological structure, characterized in that: It includes an input terminal, an output terminal, a parallel line, a first three parallel lines, a second three parallel lines, a first short-circuit branch, and a second short-circuit branch; One end of each parallel line is connected to one end of each of the first three parallel lines and one end of each of the first short-circuit branches, the other end of each of the first three parallel lines is connected to the input terminal, and the other end of each of the first short-circuit branches is grounded. The other end of each parallel line is connected to one end of each of the second three parallel lines and one end of each of the second short-circuit branches, the other end of each of the second three parallel lines is connected to the output terminal, and the other end of each of the second short-circuit branches is grounded. The first three parallel lines and the second three parallel lines, the first short-circuit branch and the second short-circuit branch are all symmetrical about the parallel lines.
2. The topological structure according to claim 1, characterized in that: The parallel lines, the first short-circuit branch and the second short-circuit branch are parallel to each other and perpendicular to the first three parallel lines and the second three parallel lines.
3. The topological structure according to claim 1, characterized in that: The electrical lengths of the parallel lines, the electrical lengths of the first three parallel lines, the electrical lengths of the second three parallel lines, the electrical lengths of the first short-circuit branches, and the electrical lengths of the second short-circuit branches are all equal.
4. The topological structure according to claim 3, characterized in that: The electrical length of the parallel lines, the electrical length of the first parallel three lines, the electrical length of the second parallel three lines, the electrical length of the first short-circuit branch and the electrical length of the second short-circuit branch are all equal to a quarter wavelength corresponding to the center frequency of the bandpass filter.
5. The topological structure according to claim 1, characterized in that: The characteristic impedance of the first short-circuit stub is equal to the characteristic impedance of the second short-circuit stub.
6. The topological structure according to claim 1, characterized in that: The parallel line includes a first conductor and a second conductor, one end of the first conductor is connected to one end of the first short-circuit branch, the other end of the first conductor is spaced opposite to one end of the second short-circuit branch, one end of the second conductor is spaced opposite to one end of the first short-circuit branch, the other end of the second conductor is connected to one end of the second short-circuit branch, the first conductor and the second conductor are spaced in parallel, and the first conductor and the second conductor are coupled.
7. The topological structure according to claim 1, characterized in that: The first parallel three-wire includes a third conductor, a fourth conductor, and a fifth conductor. One end of the third conductor is spaced opposite to one end of the first short-circuit branch, and the other end of the third conductor is connected to the input terminal. One end of the fourth conductor is connected to one end of the first short-circuit branch, and the other end of the fourth conductor is spaced opposite to the input terminal. One end of the fifth conductor is spaced opposite to one end of the first short-circuit branch, and the other end of the fifth conductor is connected to the input terminal. The third, fourth, and fifth conductors are sequentially arranged in parallel and spaced apart, and the third, fourth, and fifth conductors are coupled. The second parallel three-wire includes a sixth conductor, a seventh conductor, and an eighth conductor. One end of the sixth conductor is spaced opposite to one end of the second short-circuit branch, and the other end of the sixth conductor is connected to the output end. One end of the seventh conductor is connected to one end of the second short-circuit branch, and the other end of the seventh conductor is spaced opposite to the output end. One end of the eighth conductor is spaced opposite to one end of the second short-circuit branch, and the other end of the eighth conductor is connected to the output end. The sixth, seventh, and eighth conductors are sequentially arranged in parallel and spaced apart, and the sixth, seventh, and eighth conductors are coupled.
8. The topological structure according to claim 1, characterized in that: The length of the first short-circuit branch is greater than the length of the first three parallel lines, and the length of the first three parallel lines is equal to the length of the parallel lines; The width of the first short-circuit branch is greater than the length of the first three parallel lines, and the length of the first three parallel lines is greater than the length of the parallel lines.
9. A filter, characterized in that: The method comprises the topological structure as described in any one of claims 1 to 8.
10. A communication device, characterized in that: Comprising the filter as claimed in claim 9.