Ultra-wideband filter and communication equipment

Abstract

The embodiment of the utility model relates to the technical field of communication, and particularly discloses an ultra-wideband filter and communication equipment, the ultra-wideband filter comprises a substrate and a topological structure, and the topological structure is arranged on the substrate. The topological structure comprises an input end, a first parallel line, a second parallel line, a third parallel line, a first short-circuit branch knot, a second short-circuit branch knot, a third short-circuit branch knot, a fourth short-circuit branch knot and an output end, the other end of the first parallel line is connected with one end of the second parallel line, one end of the first short-circuited stub and one end of the second short-circuited stub, the other end of the second parallel line is connected with one end of the third parallel line, one end of the third short-circuited stub and one end of the fourth short-circuited stub, and one end of the third parallel line is connected with the output end. Six transmission poles are arranged in a passband of the ultra-wideband filter, so that high selectivity and high in-band flatness are realized, and the stability of signal transmission is improved.

Description

Technical Field

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

[0002] With the rapid development of modern wireless communication technology, high-speed and stable data transmission, as well as accurate and real-time target positioning, have become indispensable core elements in the era of the Internet of Things. UWB (Ultra-Wideband) positioning technology, with its ultra-wide bandwidth, can provide high-precision positioning services in complex wireless environments. UWB positioning technology boasts stronger anti-interference capabilities, higher positioning accuracy, and faster response times, thus showing broad application prospects in indoor positioning, the Internet of Things, smart warehousing, and personnel tracking. Ultra-wideband filters, as key components of UWB positioning systems, directly affect the accuracy and stability of the positioning system.

[0003] In the process of implementing the embodiments of this utility model, the inventors discovered that ultra-wideband filters are usually third-order, which is a low order and leads to in-band unevenness and poor selectivity, thereby affecting the stability of the positioning system. Utility Model Content

[0004] In view of the above problems, the present invention provides an ultra-wideband filter and communication device, which overcomes or at least partially solves the above problems.

[0005] To solve the above-mentioned technical problems, the present invention provides an ultra-wideband filter, comprising a substrate and a topology. The topology is disposed on the substrate and includes an input terminal, a first parallel line, a second parallel line, a third parallel line, a first short-circuit stub, a second short-circuit stub, a third short-circuit stub, a fourth short-circuit stub, and an output terminal. The input terminal is connected to one end of the first parallel line, the other end of the first parallel line is connected to one end of the second parallel line, one end of the first short-circuit stub, and one end of the second short-circuit stub, the other end of the second parallel line is connected to one end of the third parallel line, one end of the third short-circuit stub, and one end of the fourth short-circuit stub, and one end of the third parallel line is connected to the output terminal.

[0006] Optionally, the first short-circuit branch and the third short-circuit branch are symmetrically distributed about the first parallel line, and the second short-circuit branch and the fourth short-circuit branch are symmetrically distributed about the first parallel line.

[0007] Optionally, the first parallel line, the second parallel line, and the third parallel line are all arranged in parallel and are all perpendicular to the first short-circuit branch, the second short-circuit branch, the third short-circuit branch, and the fourth short-circuit branch.

[0008] Optionally, the first parallel line, the second parallel line, and the third parallel thread are arranged in a straight line, the first short-circuit branch and the second short-circuit branch are symmetrically distributed about the straight line, and the third short-circuit branch and the fourth short-circuit branch are symmetrically distributed about the straight line.

[0009] Optionally, the electrical lengths of the first parallel line, the second parallel line, the third parallel line, the first short-circuit stub, the second short-circuit stub, the third short-circuit stub, and the fourth short-circuit stub are all equal and equal to one-quarter wavelength of the passband center frequency.

[0010] Optionally, the characteristic impedances of the first short-circuited stub, the second short-circuited stub, the third short-circuited stub, and the fourth short-circuited stub are all equal.

[0011] Optionally, the first parallel line includes a first transmission line, a second transmission line, and a third transmission line arranged in parallel. The first transmission line and the third transmission line are both connected to the input terminal. The second transmission line is connected to one end of the second parallel line, one end of the first short-circuit stub, and one end of the second short-circuit stub.

[0012] Optionally, the third parallel line includes a fourth transmission line, a fifth transmission line, and a sixth transmission line arranged in parallel. The fourth transmission line and the sixth transmission line are both connected to the output terminal. The fifth transmission line is connected to the other end of the second parallel line, one end of the third short-circuit stub, and one end of the fourth short-circuit stub.

[0013] Optionally, the other ends of the first short-circuit stub, the second short-circuit stub, the third short-circuit stub, and the fourth short-circuit stub are all grounded.

[0014] To solve the above-mentioned technical problems, another technical solution adopted by this utility model is to provide a communication device, including the above-mentioned ultra-wideband filter.

[0015] The beneficial effects of this utility model embodiment are as follows: Unlike existing technologies, this utility model embodiment provides an ultra-wideband filter and communication device. The ultra-wideband filter includes a substrate and a topology. The topology is disposed on the substrate and includes an input terminal, a first parallel line, a second parallel line, a third parallel line, a first short-circuit stub, a second short-circuit stub, a third short-circuit stub, a fourth short-circuit stub, and an output terminal. The input terminal is connected to one end of the first parallel line; the other end of the first parallel line is connected to one end of the second parallel line, one end of the first short-circuit stub, and one end of the second short-circuit stub; the other end of the second parallel line is connected to one end of the third parallel line, one end of the third short-circuit stub, and one end of the fourth short-circuit stub; and one end of the third parallel line is connected to the output terminal. Through this method, the ultra-wideband filter has six transmission poles within its passband, achieving high selectivity and high in-band flatness, thus improving the stability of signal transmission. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the topology of an ultra-wideband filter provided in an embodiment of the present invention;

[0018] Figure 2 This utility model provides a layout diagram of an ultra-wideband filter.

[0019] Figure 3 yes Figure 2 Parameter labeling diagram;

[0020] Figure 4 This is a simulation result diagram of the S-parameters of an ultra-wideband filter provided by an embodiment of this utility model. Detailed Implementation

[0021] To facilitate understanding of this utility model, a more detailed description is provided below with reference to 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 one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0023] This application provides an embodiment of an ultra-wideband filter, which includes a substrate (not shown) and a topology 100 disposed on the substrate.

[0024] For the above topology 100, please refer to Figure 1 The topology 100 includes an input terminal 10, a first parallel line 20, a second parallel line 21, a third parallel line 22, a first short-circuit stub 30, a second short-circuit stub 31, a third short-circuit stub 32, a fourth short-circuit stub 33, and an output terminal 40. Specifically, the input terminal 10 is connected to one end of the first parallel line 20, the other end of the first parallel line 20 is connected to one end of the second parallel line 21, one end of the first short-circuit stub 30, and one end of the second short-circuit stub 31, the other end of the second parallel line 21 is connected to one end of the third parallel line 22, one end of the third short-circuit stub 32, and one end of the fourth short-circuit stub 33, and one end of the third parallel line 22 is connected to the output terminal 40.

[0025] In some embodiments, the other ends of the first short-circuit stub 30, the second short-circuit stub 31, the third short-circuit stub 32, and the fourth short-circuit stub 33 are all grounded.

[0026] In some embodiments, the first short-circuit branch 30 and the third short-circuit branch 32 are symmetrically distributed about the first parallel line 20, and the second short-circuit branch 31 and the fourth short-circuit branch 33 are symmetrically distributed about the first parallel line 20.

[0027] In some embodiments, the first parallel line 20, the second parallel line 21, and the third parallel line 22 are all arranged in parallel and are all perpendicular to the first short-circuit branch 30, the second short-circuit branch 31, the third short-circuit branch 32, and the fourth short-circuit branch 33.

[0028] In some embodiments, the first parallel line 20, the second parallel line 21, and the third parallel line 22 are arranged in a straight line, the first short-circuit branch 30 and the second short-circuit branch 31 are symmetrically distributed about the straight line, and the third short-circuit branch 32 and the fourth short-circuit branch 33 are symmetrically distributed about the straight line.

[0029] In some embodiments, the electrical lengths of the first parallel line 20, the second parallel line 21, the third parallel line 22, the first short-circuit stub 30, the second short-circuit stub 31, the third short-circuit stub 32, and the fourth short-circuit stub 33 are all equal and equal to one-quarter wavelength of the passband center frequency.

[0030] In some embodiments, the characteristic impedances of the first short-circuit stub 30, the second short-circuit stub 31, the third short-circuit stub 32, and the fourth short-circuit stub 33 are all equal.

[0031] Regarding the first parallel line 20 mentioned above, please refer to some embodiments. Figure 1 and Figure 2 The first parallel line 20 includes a first transmission line 201, a second transmission line 202 and a third transmission line 203 arranged in parallel. The first transmission line 201 and the third transmission line 203 are both connected to the input terminal 10. The second transmission line 202 is connected to one end of the second parallel line 21, one end of the first short-circuit stub 30 and one end of the second short-circuit stub 31.

[0032] Regarding the second parallel line 21 mentioned above, please refer to some embodiments. Figure 1 and Figure 2 The second parallel line 21 includes a seventh transmission line 211 and an eighth transmission line 212 arranged in parallel. The seventh transmission line 211 is connected to the second transmission line 202, one end of the first short-circuit stub 30 and one end of the second short-circuit stub 31. The eighth transmission line 212 is connected to one end of the third parallel line 22, one end of the third short-circuit stub 32 and one end of the fourth short-circuit stub 33.

[0033] Regarding the third parallel line 22 mentioned above, please refer to some embodiments. Figure 1 and Figure 2 The third parallel line 22 includes a fourth transmission line 221, a fifth transmission line 222 and a sixth transmission line 223 arranged in parallel. The fourth transmission line 221 and the sixth transmission line 223 are both connected to the output terminal 40. The fifth transmission line 222 is connected to the eighth transmission line 212, one end of the third short-circuit stub 32 and one end of the fourth short-circuit stub 33.

[0034] This application also provides simulation embodiments of the aforementioned ultra-wideband filter; please refer to [link / reference]. Figure 2 and Figure 3 The substrate measures 26.6mm x 16.3mm, has a thickness of 0.813mm, a dielectric constant of 3.38, and a dielectric loss of 0.0022. A set of parameters for the topology 100 is set as follows: 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. Where, l T w T The physical lengths and widths of the first transmission line 201, the second transmission line 202, the third transmission line 203, the fourth transmission line 221, the fifth transmission line 222, and the sixth transmission line 223 are respectively, s T The physical spacing between adjacent transmission lines 201, 202, and 203, and between adjacent transmission lines 221, 222, and 223, is defined as l. p w p The physical lengths and widths of the seventh transmission line 211 and the eighth transmission line 212 are s, respectively. p The physical spacing between the seventh transmission line 211 and the eighth transmission line 212 is denoted by l1 and w1, which represent the physical lengths and widths of the first short-circuit stub 30, the second short-circuit stub 31, the third short-circuit stub 32, and the fourth short-circuit stub 33, respectively.

[0035] Please see Figure 4 , Figure 4 The above simulation results show the S-parameters. The passband range with a reflection coefficient less than -10dB is 3.255GHz to 10.303GHz, the passband center frequency is 6.779GHz, the absolute passband bandwidth is 7.048GHz, and the relative passband bandwidth is 104%, demonstrating the ultra-wideband characteristics of the filter. There are six transmission poles within the passband, corresponding to frequencies of 3.34GHz, 4.13GHz, 5.92GHz, 7.52GHz, 9.47GHz, and 10.16GHz. These six transmission poles ensure the flatness of the passband insertion loss. Furthermore, the sideband steepness at the lower passband edge is 42.8dB / GHz, and at the upper passband edge it is 29.3dB / GHz, demonstrating the high selectivity of the ultra-wideband filter.

[0036] In this embodiment, the ultra-wideband filter has an ultra-wide bandwidth, low insertion loss and high selectivity by setting a topology 100 on the substrate. At the same time, it has six transmission poles in the passband to ensure high flatness in the passband, which improves the overall performance of the filter and helps to stabilize signal transmission.

[0037] This application also provides embodiments of communication devices, which include the ultra-wideband filter described above. The structure and function of the ultra-wideband filter can be found in the above embodiments, and will not be repeated here.

[0038] It should be noted that while the preferred embodiments of this utility model are provided in the specification and accompanying drawings, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this utility model; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this utility model specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. An ultra-wideband filter, characterized by, The super wideband filter comprises: a substrate; a topology structure arranged on the substrate, the topology structure comprising an input end, a first parallel line, a second parallel line, a third parallel line, a first short-circuit stub, a second short-circuit stub, a third short-circuit stub, a fourth short-circuit stub and an output end; wherein the input end is connected to one end of the first parallel line, the other end of the first parallel line is connected to one end of the second parallel line, one end of the first short-circuit stub and one end of the second short-circuit stub, the other end of the second parallel line is connected to one end of the third parallel line, one end of the third short-circuit stub and one end of the fourth short-circuit stub, and one end of the third parallel line is connected to the output end.

2. The super wideband filter according to claim 1, wherein: the first short-circuit stub and the third short-circuit stub are symmetrically distributed about the first parallel line, and the second short-circuit stub and the fourth short-circuit stub are symmetrically distributed about the first parallel line.

3. The super wideband filter according to claim 2, wherein: the first parallel line, the second parallel line and the third parallel line are all arranged in parallel and are all perpendicular to the first short-circuit stub, the second short-circuit stub, the third short-circuit stub and the fourth short-circuit stub.

4. The ultra-wideband filter of claim 3, wherein , the first parallel line, the second parallel line and the third parallel line are arranged in a straight line, the first short-circuit stub and the second short-circuit stub are symmetrically distributed about the straight line, and the third short-circuit stub and the fourth short-circuit stub are symmetrically distributed about the straight line.

5. The ultra-wideband filter of claim 1, wherein , the electrical length of the first parallel line, the electrical length of the second parallel line, the electrical length of the third parallel line, the electrical length of the first short-circuit stub, the electrical length of the second short-circuit stub, the electrical length of the third short-circuit stub and the electrical length of the fourth short-circuit stub are all equal and equal to a quarter wavelength corresponding to a passband center frequency.

6. The super wideband filter according to claim 1, wherein: the characteristic impedance of the first short-circuit stub, the characteristic impedance of the second short-circuit stub, the characteristic impedance of the third short-circuit stub and the characteristic impedance of the fourth short-circuit stub are all equal.

7. The super wideband filter according to any one of claims 1-6, wherein: the first parallel line comprises first, second and third transmission lines arranged in parallel, the first transmission line and the third transmission line are both connected to the input end, and the second transmission line is connected to one end of the second parallel line, one end of the first short-circuit stub and one end of the second short-circuit stub.

8. The super wideband filter according to claim 7, wherein: the third parallel line comprises fourth, fifth and sixth transmission lines arranged in parallel, the fourth transmission line and the sixth transmission line are both connected to the output end, and the fifth transmission line is connected to the other end of the second parallel line, one end of the third short-circuit stub and one end of the fourth short-circuit stub.

9. The super wideband filter according to any one of claims 1-6, wherein: The other end of the first short-circuit stub, the other end of the second short-circuit stub, the other end of the third short-circuit stub and the other end of the fourth short-circuit stub are all grounded.

10. A communication device, characterized by An ultra-wideband filter as claimed in any of claims 1-9.

Images