Topological structure, band-pass filter and communication equipment
By designing a novel bandpass filter topology and utilizing a combination of parallel lines and microstrip lines, the problem of non-compactness in existing bandpass filter structures is solved, enabling miniaturized and high-performance data transmission in communication devices.
Patent Information
- Application Number
- CN202520309817.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-02-24
AI Technical Summary
Existing bandpass filters suffer from a lack of compact structure, which affects the data transmission speed and development of communication equipment.
A novel topology was designed, which combines parallel lines, microstrip lines, and short-circuit stubs to ensure symmetry and consistency of electrical length and characteristic impedance, forming a compact bandpass filter topology.
This achieves miniaturization, compact structure, high selectivity, wide stopband, and high isolation of bandpass filters, thereby improving the data transmission performance of communication equipment.
Smart Images
Figure CN223828695U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of communication equipment technology, and in particular to a topology, a bandpass filter, and a communication device. Background Technology
[0002] Currently, with the rapid development of modern wireless communication technology, developing a communication device that can meet users' needs for high-speed data transmission is an inevitable trend.
[0003] Among them, the bandpass filter is one of the key components of communication equipment. Therefore, the bandpass filter has an impact on the data transmission speed of communication equipment. So, scholars and engineers need to study a bandpass filter with advantages of high selectivity, wide stopband and high isolation to improve the data transmission speed of communication equipment. Such research has extremely high scientific research value and commercial value.
[0004] While traditional bandpass filters offer advantages such as high selectivity, wide stopband, and high isolation, they often suffer from a lack of compact structure. This deficiency severely impacts their use and development in existing communication equipment. Utility Model Content
[0005] The topology, bandpass filter, and communication device provided by this utility model aim to solve at least some of the defects of existing bandpass filters.
[0006] Firstly, this utility model provides a topology. The topology includes:
[0007] Parallel lines, first parallel three lines, second parallel three lines, first microstrip line, second microstrip line, third microstrip line, fourth microstrip line, fifth microstrip line, sixth microstrip line, first short-circuit stub, second short-circuit stub, third short-circuit stub, fourth short-circuit stub, input terminal and output terminal;
[0008] One end of the first parallel three-line is connected to the input terminal; the other end of the first parallel three-line is connected to one end of the parallel line and one end of the first microstrip line; the other end of the parallel line is connected to one end of the second parallel three-line and one end of the fourth microstrip line; the other end of the first microstrip line is connected to one end of the second microstrip line and one end of the third microstrip line; the other end of the second parallel three-line is connected to the output terminal; the other end of the fourth microstrip line is connected to one end of the fifth microstrip line and one end of the sixth microstrip line.
[0009] The other end of the second microstrip line is connected to one end of the first short-circuit stub, and the other end of the first short-circuit stub is grounded; the other end of the third microstrip line is connected to one end of the second short-circuit stub, and the other end of the second short-circuit stub is grounded; the other end of the fifth microstrip line is connected to one end of the third short-circuit stub, and the other end of the third short-circuit stub is grounded; the other end of the sixth microstrip line is connected to one end of the fourth short-circuit stub, and the other end of the fourth short-circuit stub is grounded.
[0010] The second microstrip line is interconnected with the third microstrip line; the fifth microstrip line is interconnected with the sixth microstrip line.
[0011] In some embodiments, the first parallel tri-line and the second parallel tri-line are symmetrical about the parallel lines; the second microstrip line and the third microstrip line, the first short-circuit stub and the second short-circuit stub are all symmetrical about the first microstrip line; the fifth microstrip line and the sixth microstrip line, the third short-circuit stub and the fourth short-circuit stub are all symmetrical about the fourth microstrip line.
[0012] In some embodiments, the first parallel tri-line, the second parallel tri-line, the parallel line, the second microstrip line, the third microstrip line, the fifth microstrip line, and the sixth microstrip line are parallel to each other and are all perpendicular to the first microstrip line, the fourth microstrip line, the first short-circuit stub, the second short-circuit stub, the third short-circuit stub, and the fourth short-circuit stub.
[0013] In some embodiments, the electrical lengths of the parallel lines, the first parallel three lines, and the second parallel three lines are equal, and each is a quarter wavelength corresponding to the center frequency of the bandpass filter based on the topology.
[0014] In some embodiments, the electrical length of the first microstrip line is equal to the electrical length of the fourth microstrip line; the electrical lengths of the second microstrip line, the third microstrip line, the fifth microstrip line, and the sixth microstrip line are equal.
[0015] In some embodiments, the electrical lengths of the first short-circuit stub, the second short-circuit stub, the third short-circuit stub, and the fourth short-circuit stub are equal.
[0016] In some embodiments, the sum of the electrical length of the first microstrip line, the electrical length of the second microstrip line, and the electrical length of the first short-circuit stub is greater than the electrical length of the parallel line.
[0017] In some embodiments, the characteristic impedance of the first microstrip line is equal to the characteristic impedance of the fourth microstrip line; the characteristic impedances of the second microstrip line, the third microstrip line, the fifth microstrip line, the sixth microstrip line, the first short-circuit stub, the second short-circuit stub, the third short-circuit stub, and the fourth short-circuit stub are equal, and are all twice the characteristic impedances of the first microstrip line and the fourth microstrip line.
[0018] Secondly, this invention provides a bandpass filter. The bandpass filter includes the aforementioned topology.
[0019] Thirdly, this utility model provides a communication device. The communication device includes the aforementioned bandpass filter.
[0020] At least one beneficial effect of the topology, bandpass filter, and communication device provided by this utility model embodiment is that the bandpass filter designed based on this topology has the advantages of miniaturization, compact structure, high selectivity, wide stopband, and high isolation. Attached Figure Description
[0021] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.
[0022] Figure 1 This is a schematic diagram of the topology provided in an embodiment of the present utility model;
[0023] Figure 2 This is a schematic diagram of the first layout of the bandpass filter provided in this embodiment of the present invention;
[0024] Figure 3 This is a schematic diagram of the second layout of the bandpass filter provided in this embodiment of the present invention;
[0025] Figure 4 This is a simulation result diagram of the S-parameters of a bandpass filter example provided in this embodiment of the utility model.
[0026] Reference numerals: 100, bandpass filter; 11, parallel line; 111, first transmission line; 112, second transmission line; 21, first parallel tri-line; 211, third transmission line; 212, fourth transmission line; 213, fifth transmission line; 22, second parallel tri-line; 221, sixth transmission line; 222, seventh transmission line; 223, eighth transmission line; 31, first microstrip line; 32, second microstrip line; 33, third microstrip line; 34, fourth microstrip line; 35, fifth microstrip line; 36, sixth microstrip line; 41, first short-circuit stub; 42, second short-circuit stub; 43, third short-circuit stub; 44, fourth short-circuit stub; 51, input terminal; 61, output terminal. Detailed Implementation
[0027] The present invention will now be described in detail with reference to specific embodiments. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present invention.
[0028] It should be noted that, unless otherwise explicitly specified and limited, the terms "center," "longitudinal," "lateral," "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., used in this specification to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. The terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Furthermore, the terms "first," "second," "third," "fourth," "fifth," "sixth," "seventh," and "eighth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," "fourth," "fifth," "sixth," "seventh," or "eighth" may explicitly or implicitly include one or more of that feature; "multiple" or "several" means two or more; and "and / or" includes any and all combinations of one or more of the associated listed items. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0029] Figure 1 This is a schematic diagram of the topology provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the first layout of the bandpass filter provided in this embodiment of the present invention.
[0030] Please see Figure 1 and Figure 2 The topology includes: a parallel line 11, a first parallel three-line 21, a second parallel three-line 22, a first microstrip line 31, a second microstrip line 32, a third microstrip line 33, a fourth microstrip line 34, a fifth microstrip line 35, a sixth microstrip line 36, a first short-circuit stub 41, a second short-circuit stub 42, a third short-circuit stub 43, a fourth short-circuit stub 44, an input terminal 51, and an output terminal 61.
[0031] Wherein, one end of the first parallel tri-line 21 is connected to the input terminal 51; the other end of the first parallel tri-line 21 is connected to one end of the parallel line 11 and one end of the first microstrip line 31 respectively; the other end of the parallel line 11 is connected to one end of the second parallel tri-line 22 and one end of the fourth microstrip line 34 respectively; the other end of the first microstrip line 31 is connected to one end of the second microstrip line 32 and one end of the third microstrip line 33 respectively; the other end of the second parallel tri-line 22 is connected to the output terminal 61; the other end of the fourth microstrip line 34 is connected to one end of the fifth microstrip line 35 and one end of the sixth microstrip line 36 respectively.
[0032] Additionally, the other end of the second microstrip line 32 is connected to one end of the first short-circuit stub 41, and the other end of the first short-circuit stub 41 is grounded; the other end of the third microstrip line 33 is connected to one end of the second short-circuit stub 42, and the other end of the second short-circuit stub 42 is grounded; the other end of the fifth microstrip line 35 is connected to one end of the third short-circuit stub 43, and the other end of the third short-circuit stub 43 is grounded; and the other end of the sixth microstrip line 36 is connected to one end of the fourth short-circuit stub 44, and the other end of the fourth short-circuit stub 44 is grounded.
[0033] In addition, the second microstrip line 32 and the third microstrip line 33 are interconnected; the fifth microstrip line 35 and the sixth microstrip line 36 are interconnected.
[0034] In some embodiments, such as Figure 1 and Figure 2 As shown, the first parallel tri-line 21 and the second parallel tri-line 22 are symmetrical about the parallel line 11; the second microstrip line 32 and the third microstrip line 33, and the first short-circuit stub 41 and the second short-circuit stub 42 are all symmetrical about the first microstrip line 31; the fifth microstrip line 35 and the sixth microstrip line 36, and the third short-circuit stub 43 and the fourth short-circuit stub 44 are all symmetrical about the fourth microstrip line 34.
[0035] In some embodiments, combined with Figure 1 and Figure 2It can be seen that the first parallel tri-line 21, the second parallel tri-line 22, the parallel line 11, the second microstrip line 32, the third microstrip line 33, the fifth microstrip line 35, and the sixth microstrip line 36 are parallel to each other and are all perpendicular to the first microstrip line 31, the fourth microstrip line 34, the first short-circuit stub 41, the second short-circuit stub 42, the third short-circuit stub 43, and the fourth short-circuit stub 44.
[0036] In some embodiments, according to Figure 1 and Figure 2 It can be seen that the electrical lengths of parallel line 11, the first parallel three-line 21, and the second parallel three-line 22 are equal, and all are quarter wavelengths corresponding to the center frequency of the bandpass filter 100 based on the topology.
[0037] In some embodiments, by Figure 1 and Figure 2 It can be seen that the electrical length of the first microstrip line 31 is equal to the electrical length of the fourth microstrip line 34; the electrical lengths of the second microstrip line 32, the third microstrip line 33, the fifth microstrip line 35, and the sixth microstrip line 36 are equal.
[0038] In some embodiments, refer to Figures 1-2 It can be seen that the electrical lengths of the first short-circuit branch 41, the second short-circuit branch 42, the third short-circuit branch 43, and the fourth short-circuit branch 44 are equal.
[0039] In some embodiments, please continue reading Figure 1 and Figure 2 The sum of the electrical length of the first microstrip line 31, the electrical length of the second microstrip line 32, and the electrical length of the first short-circuit stub 41 is greater than the electrical length of the parallel line 11.
[0040] In some embodiments, such as Figure 1 and Figure 2 As shown, the characteristic impedance of the first microstrip line 31 is equal to that of the fourth microstrip line 34; the characteristic impedances of the second microstrip line 32, the third microstrip line 33, the fifth microstrip line 35, the sixth microstrip line 36, the first short-circuit stub 41, the second short-circuit stub 42, the third short-circuit stub 43, and the fourth short-circuit stub 44 are equal, and are all twice the characteristic impedances of the first microstrip line 31 and the fourth microstrip line 34.
[0041] This utility model also provides an embodiment of a bandpass filter. To facilitate the reader's understanding of the concept of this utility model, a simulation experiment of a physical bandpass filter 100 is conducted below. The bandpass filter 100 can be mounted on a circuit board; the circuit board dimensions are as follows: thickness is 0.813 mm; the dielectric constant of the circuit board is 3.38, and its dielectric loss is 0.0022.
[0042] Figure 3 This is a schematic diagram of the second layout of the bandpass filter provided in this embodiment of the present invention.
[0043] Combination Figure 2 and Figure 3 It can be seen that the dimensional parameters of the bandpass filter 100 are: l T =10.1mm, s T =0.1mm, w T =0.2mm, l P =10.1mm, s P =0.1mm, w P =0.2mm, l1=4.2mm, w1=1.8mm, l2=5.5mm, w2=0.9mm, l3=2.2mm, w3=0.9mm.
[0044] Among them, l T The physical lengths of the first parallel tri-line 21 and the second parallel tri-line 22; s T The physical spacing between the third transmission line 211 and the fourth transmission line 212, the physical spacing between the fourth transmission line 212 and the fifth transmission line 213, the physical spacing between the sixth transmission line 221 and the seventh transmission line 222, and the physical spacing between the seventh transmission line 222 and the eighth transmission line 223; w T The physical widths of the third transmission line 211, the fourth transmission line 212, the fifth transmission line 213, the sixth transmission line 221, the seventh transmission line 222, and the eighth transmission line 223; P s is the physical length of parallel line 11; P The physical spacing between the first transmission line 111 and the second transmission line 112; w Pl1 represents the physical width between the first transmission line 111 and the second transmission line 112; l1 represents the physical length of the first microstrip line 31 and the fourth microstrip line 34; w1 represents the physical width of the first microstrip line 31 and the fourth microstrip line 34; l2 represents the physical length of the second microstrip line 32, the third microstrip line 33, the fifth microstrip line 35, and the sixth microstrip line; w2 represents the physical width of the second microstrip line 32, the third microstrip line 33, the fifth microstrip line 35, and the sixth microstrip line; l3 represents the physical length of the first short-circuit stub 41, the second short-circuit stub 42, the third short-circuit stub 43, and the fourth short-circuit stub 44; w3 represents the physical width of the first short-circuit stub 41, the second short-circuit stub 42, the third short-circuit stub 43, and the fourth short-circuit stub 44.
[0045] Furthermore, the first dimension of the entire layout of the bandpass filter 100 is only 37.2 mm, and the second dimension is only 9.6 mm, giving the bandpass filter 100 the advantage of miniaturization; to further clarify, the first dimension is l T +l T +l P +w1+w1+w4+w5, the second dimension is l1+l1+s P +w P +w2, where w4 is the physical width of input terminal 51 and w5 is the physical width of output terminal 61.
[0046] Figure 4 This is a simulation result diagram of the S-parameters of a bandpass filter example provided in this embodiment of the utility model.
[0047] The simulation results of the bandpass filter of this invention are as follows: Figure 4 As shown, within the bandpass filter 100, the passband range with a reflection coefficient less than -10dB is from 2.2GHz to 7.08GHz. The center frequency of the bandpass filter 100 based on the above topology is 4.64GHz, the absolute bandwidth of the bandpass filter 100 is 4.88GHz, and its relative bandwidth is 105.2%.
[0048] It should be noted that the bandpass filter 100 has six transmission poles in its passband, located at 2.26 GHz, 2.81 GHz, 4.16 GHz, 5.3 GHz, 6.39 GHz and 7.01 GHz respectively. These six transmission poles ensure the flatness of the passband.
[0049] Specifically, the bandpass filter 100 has six transmission zeros in its stopband, located at 0 GHz, 0.22 GHz, 0.38 GHz, 8.16 GHz, 10.2 GHz, and 10.68 GHz, respectively. These six transmission zeros ensure the high selectivity, wide stopband, and high isolation of the bandpass filter 100.
[0050] This utility model also provides an embodiment of a communication device. The communication device includes the bandpass filter 100 described above; the structure and function of the bandpass filter 100 can be found in the above embodiments, and will not be repeated here.
[0051] In summary, the topology, bandpass filter, and communication device provided by this utility model embodiment are novel compared to traditional topologies, bandpass filters, and communication devices. The bandpass filter designed based on this topology is designed based on this topology and applied in the communication device. The bandpass filter designed based on this topology has the advantages of miniaturization, compact structure, high selectivity, wide stopband, and high isolation.
[0052] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and all of these fall within the protection scope of the present invention.
Claims
1. A topological structure, characterized in that, include: Parallel lines, first parallel three lines, second parallel three lines, first microstrip line, second microstrip line, third microstrip line, fourth microstrip line, fifth microstrip line, sixth microstrip line, first short-circuit stub, second short-circuit stub, third short-circuit stub, fourth short-circuit stub, input terminal and output terminal; One end of the first parallel three-line is connected to the input terminal; the other end of the first parallel three-line is connected to one end of the parallel line and one end of the first microstrip line respectively; the other end of the parallel line is connected to one end of the second parallel three-line and one end of the fourth microstrip line respectively; the other end of the first microstrip line is connected to one end of the second microstrip line and one end of the third microstrip line respectively. The other end of the second parallel three lines is connected to the output terminal; The other end of the fourth microstrip line is connected to one end of the fifth microstrip line and one end of the sixth microstrip line, respectively. The other end of the second microstrip line is connected to one end of the first short-circuit stub, and the other end of the first short-circuit stub is grounded; the other end of the third microstrip line is connected to one end of the second short-circuit stub, and the other end of the second short-circuit stub is grounded; the other end of the fifth microstrip line is connected to one end of the third short-circuit stub, and the other end of the third short-circuit stub is grounded; the other end of the sixth microstrip line is connected to one end of the fourth short-circuit stub, and the other end of the fourth short-circuit stub is grounded. The second microstrip line is interconnected with the third microstrip line; the fifth microstrip line is interconnected with the sixth microstrip line.
2. The topology as described in claim 1, characterized in that, The first parallel tri-line and the second parallel tri-line are symmetrical about the parallel lines; the second microstrip line and the third microstrip line, as well as the first short-circuit stub and the second short-circuit stub, are all symmetrical about the first microstrip line; the fifth microstrip line and the sixth microstrip line, as well as the third short-circuit stub and the fourth short-circuit stub, are all symmetrical about the fourth microstrip line.
3. The topology as described in claim 1, characterized in that, The first parallel three lines, the second parallel three lines, the parallel line, the second microstrip line, the third microstrip line, the fifth microstrip line, and the sixth microstrip line are parallel to each other and are all perpendicular to the first microstrip line, the fourth microstrip line, the first short-circuit stub, the second short-circuit stub, the third short-circuit stub, and the fourth short-circuit stub.
4. The topology as described in claim 1, characterized in that, The electrical lengths of the parallel lines, the first three parallel lines, and the second three parallel lines are equal, and each is a quarter wavelength corresponding to the center frequency of the bandpass filter based on the topology.
5. The topology as described in claim 1, characterized in that, The electrical length of the first microstrip line is equal to the electrical length of the fourth microstrip line; the electrical lengths of the second microstrip line, the third microstrip line, the fifth microstrip line, and the sixth microstrip line are equal.
6. The topology as described in claim 1, characterized in that, The electrical lengths of the first short-circuit stub, the second short-circuit stub, the third short-circuit stub, and the fourth short-circuit stub are equal.
7. The topology as described in claim 1, characterized in that, The sum of the electrical lengths of the first microstrip line, the second microstrip line, and the first short-circuit stub is greater than the electrical length of the parallel line.
8. The topology as described in claim 1, characterized in that, The characteristic impedance of the first microstrip line is equal to that of the fourth microstrip line; the characteristic impedances of the second microstrip line, the third microstrip line, the fifth microstrip line, the sixth microstrip line, the first short-circuit stub, the second short-circuit stub, the third short-circuit stub, and the fourth short-circuit stub are equal, and are all twice the characteristic impedances of the first microstrip line and the fourth microstrip line.
9. A bandpass filter, characterized in that, include: The topology as described in any one of claims 1-8.
10. A communication device, characterized in that, include: The bandpass filter as described in claim 9.