Topological structure, ultra-wideband filter and communication equipment

Abstract

The embodiment of the utility model provides a topological structure, an ultra wide band filter and communication equipment. According to the topological structure, one end of a first parallel three line is connected to an input end; the other end of the first parallel three wire is respectively connected with one end of the parallel wire, one end of the first short-circuit branch and one end of the second short-circuit branch; the other end of the parallel line is respectively connected with one end of the second parallel three line, one end of the third short-circuit branch and one end of the fourth short-circuit branch; the other end of the first short-circuit branch is grounded; the other end of the second short-circuit branch is grounded; the other end of the third short-circuit branch is grounded; the other end of the fourth short-circuit branch is grounded; the other end of the second parallel three line is connected to the output end; the first short-circuit branch and the second short-circuit branch are connected with each other; the third short-circuit branch and the fourth short-circuit branch are connected with each other. The ultra-wideband filter based on the topological structure has the advantages of in-band flatness and high selectivity.

Description

Technical Field

[0001] This utility model relates to the field of communication equipment technology, and in particular to a topology, an ultra-wideband filter, and a communication device. Background Technology

[0002] Currently, with the rapid development of modern wireless communication technology, high-speed data transmission and precise target positioning have become key to the Internet of Things.

[0003] Against this backdrop, UWB (Ultra Wide Band) positioning technology emerged and is gradually being incorporated into daily production and life.

[0004] Generally speaking, ultra-wideband filters are one of the key components in UWB positioning systems, and their performance can affect the positioning accuracy and data transmission speed.

[0005] However, most of the conventional ultra-wideband filters disclosed in the existing technology have the problem of low order, which leads to defects such as in-band unevenness and poor selectivity, thus seriously affecting the use and development of conventional ultra-wideband filters in existing communication equipment. Utility Model Content

[0006] The topology, ultra-wideband filter, and communication device provided by this utility model aim to solve at least some of the defects of existing ultra-wideband filters.

[0007] Firstly, this utility model provides a topology. The topology includes:

[0008] Parallel line, first parallel three-line, second parallel three-line, first short-circuit stub, second short-circuit stub, third short-circuit stub, fourth short-circuit stub, input terminal and output terminal;

[0009] One end of the first parallel three-wire is connected to the input terminal; the other end of the first parallel three-wire is connected to one end of the parallel wire, one end of the first short-circuit stub, and one end of the second short-circuit stub, respectively; the other end of the parallel wire is connected to one end of the second parallel three-wire, one end of the third short-circuit stub, and one end of the fourth short-circuit stub, respectively; the other end of the first short-circuit stub is grounded; the other end of the second short-circuit stub is grounded; the other end of the third short-circuit stub is grounded; the other end of the fourth short-circuit stub is grounded; the other end of the second parallel three-wire is connected to the output terminal.

[0010] The first short-circuit branch and the second short-circuit branch are interconnected; the third short-circuit branch and the fourth short-circuit branch are interconnected.

[0011] In some embodiments, the first parallel tri-line and the second parallel tri-line, the first short-circuit branch and the third short-circuit branch, and the second short-circuit branch and the fourth short-circuit branch are all symmetrical about the parallel lines.

[0012] In some embodiments, the parallel line, the first parallel tri-line, and the second parallel tri-line are arranged collinearly; the first short-circuit branch and the second short-circuit branch, the third short-circuit branch and the fourth short-circuit branch are all symmetrical about the parallel line, the first parallel tri-line, or the second parallel tri-line.

[0013] In some embodiments, the parallel lines, the first parallel tri-line, and the second parallel tri-line are parallel to each other and are all perpendicular to the first short-circuit branch, the second short-circuit branch, the third short-circuit branch, or the fourth short-circuit branch.

[0014] In some embodiments, the first short-circuit stub, the second short-circuit stub, the third short-circuit stub, and the fourth short-circuit stub are parallel to each other and are all perpendicular to the parallel line, the first parallel tri-line, or the second parallel tri-line.

[0015] In some embodiments, the electrical lengths of the parallel lines, the first parallel tri-line, and the second parallel tri-line are equal, and each is equal to a quarter wavelength corresponding to the center frequency of the ultra-wideband filter based on the topology.

[0016] 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, and each is equal to a quarter wavelength corresponding to the center frequency of the ultra-wideband filter based on the topology.

[0017] In some embodiments, the characteristic impedances of the first short-circuit stub, the second short-circuit stub, the third short-circuit stub, and the fourth short-circuit stub are all equal.

[0018] Secondly, this invention provides an ultra-wideband filter. The ultra-wideband filter includes the aforementioned topology.

[0019] Thirdly, this utility model provides a communication device. The communication device includes the aforementioned ultra-wideband filter.

[0020] At least one beneficial effect of the topology, ultra-wideband filter, and communication equipment provided by this utility model embodiment is that the ultra-wideband filter designed based on this topology has the advantages of in-band flatness and high selectivity. 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 ultra-wideband filter provided in this embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the second layout of the ultra-wideband filter provided in this embodiment of the present invention;

[0025] Figure 4 This is a simulation result diagram of the S-parameters of an ultra-wideband filter example provided in this embodiment of the present invention.

[0026] Reference numerals: 100, Ultra-wideband 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 short-circuit stub; 32, Second short-circuit stub; 33, Third short-circuit stub; 34, Fourth short-circuit stub; 41, Input terminal; 51, 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 ultra-wideband filter provided in this embodiment of the present invention.

[0030] Please see Figure 1 and Figure 2 The topology includes: parallel line 11, first parallel three-line 21, second parallel three-line 22, first short-circuit stub 31, second short-circuit stub 32, third short-circuit stub 33, fourth short-circuit stub 34, input terminal 41, and output terminal 51.

[0031] Wherein, one end of the first parallel three-wire 21 is connected to the input terminal 41; the other end of the first parallel three-wire 21 is connected to one end of the parallel line 11, one end of the first short-circuit stub 31 and one end of the second short-circuit stub 32 respectively; the other end of the parallel line 11 is connected to one end of the second parallel three-wire 22, one end of the third short-circuit stub 33 and one end of the fourth short-circuit stub 34 respectively; the other end of the first short-circuit stub 31 is grounded; the other end of the second short-circuit stub 32 is grounded; the other end of the third short-circuit stub 33 is grounded; the other end of the fourth short-circuit stub 34 is grounded; the other end of the second parallel three-wire 22 is connected to the output terminal 51.

[0032] In addition, the first short-circuit branch 31 and the second short-circuit branch 32 are interconnected; the third short-circuit branch 33 and the fourth short-circuit branch 34 are interconnected.

[0033] In some embodiments, the first parallel tri-line 21 and the second parallel tri-line 22, the first short-circuit branch 31 and the third short-circuit branch 33, and the second short-circuit branch 32 and the fourth short-circuit branch 34 are all symmetrical about the parallel line 11.

[0034] In some embodiments, parallel line 11, first parallel tri-line 21, and second parallel tri-line 22 are arranged collinearly; the first short-circuit branch 31 and the second short-circuit branch 32, the third short-circuit branch 33 and the fourth short-circuit branch 34 are all symmetrical about parallel line 11, the first parallel tri-line 21 or the second parallel tri-line 22.

[0035] In some embodiments, the parallel line 11, the first parallel tri-line 21, and the second parallel tri-line 22 are parallel to each other and are all perpendicular to the first short-circuit branch 31, the second short-circuit branch 32, the third short-circuit branch 33, or the fourth short-circuit branch 34.

[0036] In some embodiments, the first short-circuit branch 31, the second short-circuit branch 32, the third short-circuit branch 33 and the fourth short-circuit branch 34 are parallel to each other and are all perpendicular to the parallel line 11, the first parallel tri-line 21 or the second parallel tri-line 22.

[0037] In some embodiments, the electrical lengths of the parallel line 11, the first parallel tri-line 21, and the second parallel tri-line 22 are equal, and each is equal to a quarter wavelength corresponding to the center frequency of the topology-based ultra-wideband filter 100.

[0038] In some embodiments, the electrical lengths of the first short-circuit stub 31, the second short-circuit stub 32, the third short-circuit stub 33, and the fourth short-circuit stub 34 are equal, and each is equal to a quarter wavelength corresponding to the center frequency of the topology-based ultra-wideband filter 100.

[0039] In some embodiments, the characteristic impedances of the first short-circuit stub 31, the second short-circuit stub 32, the third short-circuit stub 33, and the fourth short-circuit stub 34 are all equal.

[0040] This utility model also provides an embodiment of an ultra-wideband filter. To facilitate the reader's understanding of the concept of this utility model, a simulation experiment of the actual ultra-wideband filter 100 is conducted below. The ultra-wideband 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.

[0041] Figure 3 This is a schematic diagram of the second layout of the ultra-wideband filter provided in this embodiment of the present invention.

[0042] Combination Figure 2 and Figure 3 It can be seen that the dimensional parameters of the ultra-wideband filter 100 are: l T =7.0mm, s T =0.1mm, w T =0.2mm, l P =7.0mm, s P =0.1mm, w P =0.2mm, l1=7.4mm, w1=1.0mm.

[0043] Among them, l T Let s be the physical lengths of the first parallel tri-line 21 and the second parallel tri-line 22; 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 The physical length of parallel line 11; s P The physical spacing between the first transmission line 111 and the second transmission line 112; w P l1 represents the physical width between the first transmission line 111 and the second transmission line 112; l1 represents the physical length of the first short-circuit stub 31, the second short-circuit stub 32, the third short-circuit stub 33, and the fourth short-circuit stub 34; w1 represents the physical width of the first short-circuit stub 31, the second short-circuit stub 32, the third short-circuit stub 33, and the fourth short-circuit stub 34.

[0044] Furthermore, the first dimension of the entire layout of the ultra-wideband filter 100 is only 26.6 mm, and the second dimension of the entire layout of the ultra-wideband filter 100 is only 16.3 mm; to further clarify, the first dimension is l T +l T +l P +w1+w1+w4+w5, the second dimension is l1+l1+w P +m AWhere w4 is the physical width of input terminal 41, w5 is the physical width of output terminal 51, and m A The double-sided gap between the trace edge of the ultra-wideband filter 100 and the layout edge of this topology (in other words, m A This refers to the allowance reserved on both sides during the actual processing.

[0045] Figure 4 This is a simulation result diagram of the S-parameters of an ultra-wideband filter example provided in this embodiment of the present invention.

[0046] The simulation results of the ultra-wideband filter of this invention are as follows: Figure 4 As shown, within the ultra-wideband filter 100, the passband range with a reflection coefficient less than -10dB is from 3.255GHz to 10.303GHz. The center frequency of the ultra-wideband filter 100 based on the above topology is 6.779GHz. The absolute bandwidth of the ultra-wideband filter 100 is 7.048GHz, and its relative bandwidth is 104%.

[0047] It should be noted that the ultra-wideband filter 100 has six transmission poles in its passband, located at 3.34 GHz, 4.13 GHz, 5.92 GHz, 7.52 GHz, 9.47 GHz and 10.16 GHz respectively. These six transmission poles ensure the flatness of the passband insertion loss.

[0048] Specifically, the sideband steepness of the ultra-wideband filter 100 is 42.8 dB / GHz at the lower passband edge and 29.3 dB / GHz at the upper passband edge, demonstrating high selectivity.

[0049] This utility model also provides an embodiment of a communication device. The communication device includes the ultra-wideband filter 100 described above; the structure and function of the ultra-wideband filter 100 can be found in the above embodiments, and will not be repeated here.

[0050] In summary, the topology, ultra-wideband filter, and communication device provided by this utility model embodiment are novel compared to traditional topologies, ultra-wideband filters, and communication devices. The ultra-wideband filter designed based on this topology is designed based on this topology and applied in the communication device. The ultra-wideband filter designed based on this topology has the advantages of in-band flatness and high selectivity.

[0051] 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 line, first parallel three-line, second parallel three-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-wire is connected to the input terminal; the other end of the first parallel three-wire is connected to one end of the parallel wire, one end of the first short-circuit stub, and one end of the second short-circuit stub, respectively; the other end of the parallel wire is connected to one end of the second parallel three-wire, one end of the third short-circuit stub, and one end of the fourth short-circuit stub, respectively; the other end of the first short-circuit stub is grounded; the other end of the second short-circuit stub is grounded; the other end of the third short-circuit stub is grounded; the other end of the fourth short-circuit stub is grounded; the other end of the second parallel three-wire is connected to the output terminal. The first short-circuit branch and the second short-circuit branch are interconnected; the third short-circuit branch and the fourth short-circuit branch are interconnected.

2. The topology as described in claim 1, characterized in that, The first parallel tri-line and the second parallel tri-line, the first short-circuit branch and the third short-circuit branch, and the second short-circuit branch and the fourth short-circuit branch are all symmetrical about the parallel lines.

3. The topology as described in claim 1, characterized in that, The parallel line, the first parallel three-line, and the second parallel three-line are arranged collinearly; the first short-circuit branch and the second short-circuit branch, the third short-circuit branch and the fourth short-circuit branch are all symmetrical about the parallel line, the first parallel three-line, or the second parallel three-line.

4. The topology as described in claim 1, characterized in that, The parallel lines, the first three parallel lines, and the second three parallel lines are parallel to each other and are all perpendicular to the first short-circuit branch, the second short-circuit branch, the third short-circuit branch, or the fourth short-circuit branch.

5. The topology as described in claim 1, characterized in that, The first short-circuit branch, the second short-circuit branch, the third short-circuit branch, and the fourth short-circuit branch are parallel to each other and are all perpendicular to the parallel line, the first parallel three-line, or the second parallel three-line.

6. 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 equal to a quarter wavelength at the center frequency of the ultra-wideband filter based on the topology.

7. 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, and each is equal to a quarter wavelength at the center frequency of the ultra-wideband filter based on the topology.

8. The topology as described in claim 1, characterized in that, The characteristic impedances of the first short-circuit stub, the second short-circuit stub, the third short-circuit stub, and the fourth short-circuit stub are all equal.

9. An ultra-wideband 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 ultra-wideband filter as described in claim 9.

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