Filter and electronic equipment

Abstract

The utility model relates to the technical field of wireless communication, and discloses a filter and electronic equipment, and the filter comprises an input end, a first topology structure, a first parallel line assembly, a second topology structure, a third topology structure, a second parallel line assembly, a fourth topology structure, a fifth topology structure, a third parallel line assembly, a sixth topology structure and an output end. The first topology structure and the first parallel line assembly are electrically connected with the input end; the second topology structure and the third topology structure are electrically connected with the first parallel line assembly; the second parallel line assembly is electrically connected with the first parallel line assembly; the fourth topology structure, the fifth topology structure and the third parallel line assembly are electrically connected with the second parallel line assembly, and the fourth topology structure is electrically connected with the second topology structure; the fifth topology structure is electrically connected with the third topology structure; the third parallel line assembly is electrically connected with the second parallel line assembly; the third parallel line assembly is electrically connected with the output end. In this way, the notch characteristic of the filter can be enhanced.

Description

Technical Field

[0001] The embodiments of the utility model relate to the technical field of wireless communication, and in particular to a filter and an electronic device. Background Art

[0002] Filters are used to selectively pass or suppress signals of specific frequencies, thereby selecting signals in the required frequency range and reducing interference caused by signals of other frequencies. They are an indispensable structure in wireless communication systems.

[0003] During the implementation of the embodiments of the utility model, the inventors found that the existing filter lacks a transmission zero point in the passband, resulting in poor notch characteristics of the filter and strong in-band interference, which limits the use of the filter in wireless communication systems. Utility Model Content

[0004] The main technical problem solved by the embodiments of the utility model is to provide a filter and an electronic device, which can make a transmission zero point exist in the filter, thereby enhancing the notch characteristic of the filter and facilitating the reduction of in-band interference.

[0005] In order to solve the above technical problems, a technical solution adopted by an embodiment of the utility model is: providing a filter, including an input end, a first topological structure, a first parallel line component, a second topological structure, a third topological structure, a second parallel line component, a fourth topological structure, a fifth topological structure, a third parallel line component, a sixth topological structure and an output end; one end of the first topological structure is electrically connected to the input end; one end of the first parallel line component is electrically connected to the input end; one end of the second topological structure is electrically connected to the other end of the first parallel line component; one end of the third topological structure is electrically connected to the other end of the first parallel line component, and the second topological structure and the third topological structure are respectively located on both sides of the first parallel line component ; one end of the second parallel line component is electrically connected to the other end of the first parallel line component; one end of the fourth topology structure is electrically connected to the other end of the second parallel line component, and the other end of the fourth topology structure is electrically connected to the other end of the second topology structure; one end of the fifth topology structure is electrically connected to the other end of the second parallel line component, and the other end of the fifth topology structure is electrically connected to the other end of the third topology structure; one end of the third parallel line component is electrically connected to the other end of the second parallel line component, and the first parallel line component, the second parallel line component and the third parallel line component are parallel to each other; one end of the sixth topology structure is electrically connected to the other end of the third parallel line component; the other end of the third parallel line component is electrically connected to the output end.

[0006] In some embodiments, the first topology structure includes a first microstrip line and a first open-circuit branch, one end of the first microstrip line is electrically connected to the input end, and one end of the first open-circuit branch is electrically connected to the other end of the first microstrip line.

[0007] In some embodiments, the first parallel line assembly includes a first transmission line and a second transmission line, one end of the first transmission line is electrically connected to the input end, the other end of the first transmission line extends toward one end of the second topological structure, the second transmission line is located between the first transmission line and the first topological structure, and the second transmission line is parallel to the first transmission line, and one end of the second topological structure and one end of the third topological structure are electrically connected to the second transmission line.

[0008] In some embodiments, the second topology structure includes a second microstrip line and a first short-circuit branch, one end of the second microstrip line is electrically connected to an end of the second transmission line away from the input end, one end of the first short-circuit branch is electrically connected to the other end of the second microstrip line, and the first short-circuit branch is parallel to the second parallel line component.

[0009] In some embodiments, the third topology structure includes a third microstrip line and a second short-circuit branch, one end of the third microstrip line is electrically connected to an end of the second transmission line away from the input end, one end of the second short-circuit branch is electrically connected to the other end of the third microstrip line, the second short-circuit branch is parallel to the second parallel line component, and the second parallel line component is located between the first short-circuit branch and the second short-circuit branch.

[0010] In some embodiments, the second parallel line assembly includes a third transmission line and a fourth transmission line parallel to each other, one end of the third transmission line is electrically connected to one end of the second topological structure, and the fourth transmission line is electrically connected to the fourth topological structure and the fifth topological structure.

[0011] In some embodiments, the fourth topology structure includes a fourth microstrip line and a third short-circuit branch, one end of the fourth microstrip line is electrically connected to the second parallel line component, one end of the third short-circuit branch is electrically connected to the other end of the fourth microstrip line, and the other end of the third short-circuit branch is electrically connected to the first short-circuit branch.

[0012] In some embodiments, the fifth topology structure includes a fifth microstrip line and a fourth short-circuit branch, one end of the fifth microstrip line is electrically connected to the second parallel line component, one end of the fourth short-circuit branch is electrically connected to the other end of the fifth microstrip line, and the other end of the fourth short-circuit branch is electrically connected to the second short-circuit branch.

[0013] In some embodiments, the sixth topology structure includes a sixth microstrip line and a second open branch, one end of the sixth microstrip line is electrically connected to the output end, and the other end of the sixth microstrip line is electrically connected to one end of the second open branch.

[0014] In order to solve the above technical problem, another technical solution adopted by the embodiment of the utility model is: to provide an electronic device, including the above filter.

[0015] The beneficial effect of the embodiment of the utility model is: different from the prior art, in the embodiment of the utility model, by setting the first topology structure and the sixth topology structure, the filter has a notch characteristic, and by setting the second topology structure, the third topology structure, the fourth topology structure and the fifth topology structure, the filter can form a transmission zero point in the passband, thereby enhancing the notch characteristic of the filter, reducing in-band interference, and helping to expand the application range of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. 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 scale.

[0017] Figure 1 It is a schematic diagram of the structure of the filter provided in the embodiment of the utility model;

[0018] Figure 2 It is a simulation result diagram of the filter provided in the embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the structure of the filter provided in the embodiment of the utility model;

[0020] Figure 4 yes Figure 3 A magnified view of the area shown in middle A;

[0021] Figure 5 yes Figure 3 Magnified view of the area shown in part B.

[0022] Description of symbols

[0023] 1. Filter;

[0024] 101, input terminal;

[0025] 102. a first topological structure; 1021. a first microstrip line; 1022. a first open branch;

[0026] 103, first parallel line; 1031, first transmission line; 1032, second transmission line;

[0027] 104, a second topological structure; 1041, a second microstrip line; 1042, a first short-circuit branch;

[0028] 105. a third topological structure; 1051. a third microstrip line; 1052. a second short-circuit branch;

[0029] 106, second parallel line assembly; 1061, third transmission line; 1062, fourth transmission line;

[0030] 107, fourth topological structure; 1071, fourth microstrip line; 1072, third short-circuit branch;

[0031] 108, fifth topological structure; 1081, fifth microstrip line; 1082, fourth short-circuit branch;

[0032] 109, third parallel line; 1091, fifth transmission line; 1092, sixth transmission line;

[0033] 110, sixth topological structure; 1101, sixth microstrip line; 1102, second open branch;

[0034] 111, output terminal; DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the utility model, the utility model is 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 "fixed to" another element, it can be directly on another element or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "vertical", "horizontal", etc. used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the utility model 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 to the utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0036] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0037] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] See also Figure 1The filter 1 includes: an input terminal 101, a first topological structure 102, a first parallel line component 103, a second topological structure 104, a third topological structure 105, a second parallel line component 106, a fourth topological structure 107, a fifth topological structure 108, a third parallel line component 109, a sixth topological structure 110 and an output terminal 111. The input terminal 101 is used to receive a signal, and the output terminal 111 is used to output a signal. One end of the first topological structure 102 is electrically connected to the input terminal 101, and one end of the first parallel line component 103 is electrically connected to the input terminal 101. One end of the second topological structure 104 is electrically connected to the other end of the first parallel line component 103, and the other end of the first parallel line component 103 is an end away from the input terminal 101. One end of the third topological structure 105 is electrically connected to the other end of the first parallel line component 103, and the second topological structure 104 and the third topological structure 105 are respectively located on both sides of the first parallel line component 103. One end of the second parallel line component 106 is electrically connected to the other end of the first parallel line component 103, one end of the fourth topology structure 107 is electrically connected to the other end of the second parallel line component 106, and the other end of the fourth topology structure 107 is electrically connected to the other end of the second topology structure 104. One end of the fifth topology structure 108 is electrically connected to the other end of the second parallel line component 106, and the other end of the fifth topology structure 108 is electrically connected to the other end of the third topology structure 105. One end of the third parallel line component 109 is electrically connected to the other end of the second parallel line component 106, and the other end of the third parallel line component 109 is electrically connected to the output end 111, wherein the first parallel line component 103, the second parallel line component 106 and the third parallel line component 109 are parallel to each other. One end of the sixth topology structure 110 is electrically connected to the other end of the third parallel line component 109. The first topology structure 102 and the sixth topology structure 110 form an open circuit (i.e., the other end of the first topology structure 102 and the other end of the sixth topology structure 110 are not electrically connected to other structures or components). The first topology structure 102 and the sixth topology structure 110 are used together to introduce notch waves. The second topology structure 104, the third topology structure 105, the fourth topology structure 107 and the fifth topology structure 108 have two functions. On the one hand, they can form transmission zero points in the passband, thereby improving the selectivity of the filter 1 and enhancing the notch wave characteristics of the filter 1; on the other hand, they can cooperate with the first parallel line component 103, the second parallel line component 106 and the third parallel line component 109 to form multiple transmission poles in the passband, which is beneficial to improving the flatness in the passband.

[0039] It is worth noting that in this application, the so-called passband refers to the frequency range of the signal allowed to pass, please refer to Figure 2 , Figure 2The S parameter simulation results of the filter 1 of the present application are shown. In the figure, the dotted line represents the reflection coefficient, the solid line represents the transmission coefficient, and the passband refers to the frequency band where the reflection coefficient is less than -10dB. The signals in this frequency band can pass through the filter 1 of the present application, while the signals in other frequency bands are suppressed in the filter 1 of the present application to form a stopband. In the present application, the frequency band range of the passband is 2.27GHz to 7.29GHz.

[0040] For the first topology structure 102, please refer to Figure 1 The first topological structure 102 includes a first microstrip line 1021 and a first open branch 1022. One end of the first microstrip line 1021 is electrically connected to the input end 101, one end of the first open branch 1022 is electrically connected to the other end of the first microstrip line 1021, and the other end of the first open branch 1022 is suspended (i.e., not electrically connected to other structures or components). The first microstrip line 1021 and the first open branch 1022 are used together to introduce a notch.

[0041] In some embodiments, the first open branch 1022 is perpendicular to the first microstrip line 1021 , which helps to reduce the size of the first topology structure 102 in the first direction X. The first direction X is parallel to the first microstrip line 1021 .

[0042] For the first parallel line assembly 103, see Figure 1 The first parallel line component 103 includes a first transmission line 1031 and a second transmission line 1032. The first microstrip line 1021, the first transmission line 1031 and the second transmission line 1032 are parallel to each other. One end of the first transmission line 1031 is electrically connected to the input end 101, the other end of the first transmission line 1031 extends along the first direction X, and there is a gap between the first transmission line 1031 and the second topology structure 104 and the third topology structure 105. The second transmission line 1032 is located between the first transmission line 1031 and the first microstrip line 1021, one end of the second topology structure 104 and one end of the third topology structure 105 are both electrically connected to one end of the second transmission line 1032, the other end of the second transmission line 1032 extends toward the input end 101 along the first direction X, and there is a gap between the other end of the second transmission line 1032 and the input end 101.

[0043] For the second topology structure 104, please refer to Figure 1 The second topology structure 104 includes a second microstrip line 1041 and a first short-circuit branch 1042, one end of the second microstrip line 1041 is electrically connected to an end of the second transmission line 1032 away from the input end 101, one end of the first short-circuit branch 1042 is electrically connected to the other end of the second microstrip line 1041, and the other end of the first short-circuit branch 1042 extends along the first direction X.

[0044] In some embodiments, the first short-circuit stub 1042 is parallel to the first transmission line 1031 .

[0045] For the third topology structure 105, please refer to Figure 1 The third topology structure 105 includes a third microstrip line 1051 and a second short-circuit branch 1052, one end of the third microstrip line 1051 is electrically connected to an end of the second transmission line 1032 away from the input end 101, one end of the second short-circuit branch 1052 is electrically connected to the other end of the third microstrip line 1051, and the other end of the second short-circuit branch 1052 extends along the first direction X, wherein the third microstrip line 1051 and the second microstrip line 1041 are respectively located on both sides of the first parallel line component 103.

[0046] In some embodiments, the third microstrip line 1051 is parallel to the second microstrip line 1041 .

[0047] In some embodiments, the second short-circuit stub 1052 is parallel to the first transmission line 1031 .

[0048] For the second parallel line assembly 106, see Figure 1 The second parallel line component 106 includes a third transmission line 1061 and a fourth transmission line 1062, and the third transmission line 1061 and the fourth transmission line 1062 are located between the first short-circuit stub 1042 and the second short-circuit stub 1052. The third transmission line 1061 and the fourth transmission line 1062 are both parallel to the first transmission line 1031, one end of the third transmission line 1061 is electrically connected to one end of the second microstrip line 1041, the other end of the third transmission line 1061 extends along the first direction X, and there is a gap between the other end of the third transmission line 1061 and the fourth topology structure 107. One end of the fourth transmission line 1062 is electrically connected to the fourth topology structure 107 and the fifth topology structure 108, the other end of the fourth transmission line 1062 extends along the first direction X close to the input end 101, and there is a gap between the other end of the first transmission line 1031 and the second microstrip line 1041 and the third microstrip line 1051.

[0049] For the fourth topology structure 107, please refer to Figure 1 The fourth topology structure 107 includes a fourth microstrip line 1071 and a third short-circuit branch 1072, one end of the fourth microstrip line 1071 is electrically connected to one end of the fourth transmission line 1062, one end of the third open-circuit branch is electrically connected to the other end of the fourth microstrip line 1071, and the other end of the third short-circuit branch 1072 is electrically connected to the other end of the first short-circuit branch 1042.

[0050] In some embodiments, the fourth microstrip line 1071 and the second microstrip line 1041 are parallel to each other, and the third short-circuit stub 1072 and the third transmission line 1061 are parallel to each other.

[0051] For the fifth topology structure 108, please refer to Figure 1 The fifth topology structure 108 includes a fifth microstrip line 1081 and a fourth short-circuit branch 1082, one end of the fifth microstrip line 1081 is electrically connected to one end of the fourth transmission line 1062, one end of the fourth short-circuit branch 1082 is electrically connected to the other end of the fifth microstrip line 1081, and the other end of the fourth short-circuit branch 1082 is electrically connected to the other end of the second short-circuit branch 1052.

[0052] In some embodiments, the fifth microstrip line 1081 is parallel to the third microstrip line 1051 , and the fourth short-circuit stub 1082 is parallel to the third short-circuit stub 1072 .

[0053] For the third parallel line assembly 109, see Figure 1 The third parallel line component 109 includes a fifth transmission line 1091 and a sixth transmission line 1092, and the fifth transmission line 1091 and the sixth transmission line 1092 are parallel to the first transmission line 1031. One end of the fifth transmission line 1091 is electrically connected to one end of the fourth microstrip line 1071 and one end of the fifth microstrip line 1081, and the other end of the fifth transmission line 1091 extends along the first direction X toward the output end 111, and there is a gap between the other end of the fifth transmission line 1091 and the output end 111. One end of the sixth transmission line 1092 is electrically connected to the output end 111, and the other end of the sixth transmission line 1092 extends along the first direction X toward the input end 101, and there is a gap between the other end of the sixth transmission line 1092 and the fourth microstrip line 1071 and the fifth microstrip line 1081.

[0054] For the sixth topology structure 110, please refer to Figure 1 The sixth topology structure 110 includes a sixth microstrip line 1101 and a second open branch 1102, one end of the sixth microstrip line 1101 is electrically connected to the output end 111, the other end of the sixth microstrip line 1101 extends along the first direction X toward the input end 101, one end of the second open branch 1102 is electrically connected to the other end of the sixth microstrip line 1101, and the other end of the second open branch 1102 is suspended (that is, the other end of the second open branch 1102 is not electrically connected to other structures or components).

[0055] In some embodiments, the odd-mode characteristic impedance of the first parallel line component 103, the odd-mode characteristic impedance of the second parallel line component 106, and the odd-mode characteristic impedance of the third parallel line component 109 are equal. By making the odd-mode characteristic impedances of the first parallel line component 103, the second parallel line component 106, and the third parallel line component 109 equal, the resistance of the signal transmitted in the first parallel line component 103, the second parallel line component 106, and the third parallel line component 109 can be reduced.

[0056] In some embodiments, the even-mode characteristic impedance of the first parallel line component 103, the even-mode characteristic impedance of the second parallel line component 106, and the even-mode characteristic impedance of the third parallel line component 109 are equal. By making the even-mode characteristic impedances of the first parallel line component 103, the second parallel line component 106, and the third parallel line component 109 equal, the resistance of the signal transmitted in the first parallel line component 103, the second parallel line component 106, and the third parallel line component 109 can be reduced.

[0057] In some embodiments, the characteristic impedance of the first microstrip line 1021 , the characteristic impedance of the sixth microstrip line 1101 , the characteristic impedance of the first open-circuit stub 1022 , and the characteristic impedance of the second open-circuit stub 1102 are equal.

[0058] In some embodiments, the characteristic impedance of the second microstrip line 1041, the characteristic impedance of the third microstrip line 1051, the characteristic impedance of the fourth microstrip line 1071, the characteristic impedance of the fifth microstrip line 1081, the characteristic impedance of the first short-circuit branch 1042, the characteristic impedance of the second short-circuit branch 1052, the characteristic impedance of the third short-circuit branch 1072, and the characteristic impedance of the fourth short-circuit branch 1082 are equal, thereby reducing the resistance to signal transmission in the filter 1.

[0059] In some embodiments, the electrical length of the first parallel line component 103, the electrical length of the second parallel line component 106, and the electrical length of the third parallel line component 109 are all equal to a quarter wavelength corresponding to the passband center frequency. In the present application, Figure 2 As shown, the passband center frequency is 4.78 GHz.

[0060] In some embodiments, the electrical length of the first microstrip line 1021 is equal to the electrical length of the sixth microstrip line 1101, the electrical length of the first open branch 1022 is equal to the electrical length of the second open branch 1102, and the sum of the electrical length of the first microstrip line 1021 and the electrical length of the first open branch 1022 is one-quarter wavelength corresponding to the center frequency of the notch.

[0061] In some embodiments, the electrical length of the second microstrip line 1041 is equal to the electrical length of the fifth microstrip line 1081. The electrical length of the third microstrip line 1051 is equal to the electrical length of the fourth microstrip line 1071. The electrical length of the first short-circuit stub 1042 is equal to the electrical length of the fourth short-circuit stub 1072. The electrical length of the second short-circuit stub 1052 is equal to the electrical length of the third short-circuit stub 1072. The sum of the electrical length of the second microstrip line 1041 and the electrical length of the first short-circuit stub 1042 is equal to the sum of the electrical length of the fourth microstrip line 1071 and the electrical length of the third short-circuit stub 1072. The sum of the electrical length of the second microstrip line 1041 and the electrical length of the first short-circuit stub 1042 is greater than a quarter wavelength corresponding to the center frequency (4.78 GHz) of the passband.

[0062] In some embodiments, see Figure 3 , Figure 4 and Figure 5 , the length L1 of the first parallel line component 103 is 9.8 mm. The length of the first parallel line component 103 is equal to the length of the third parallel line component 109 .

[0063] In some embodiments, the spacing S1 between the first transmission line 1031 and the second transmission line 1032 is equal to the spacing between the fifth transmission line 1091 and the sixth transmission line 1092 , and S1 =0.1 mm.

[0064] In some embodiments, the width of the first transmission line 1031 is W1, and W1=0.2 mm. The widths of the first transmission line 1031, the second transmission line 1032, the fifth transmission line 1091, and the sixth transmission line 1092 are equal.

[0065] In some embodiments, the length L2 of the second parallel line assembly 106 is 9.7 mm.

[0066] In some embodiments, the interval S2 between the third transmission line 1061 and the fourth transmission line 1062 is 0.1 mm.

[0067] In some embodiments, the width W2 of the third transmission line 1061 is 0.2 mm, and the widths of the third transmission line 1061 and the fourth transmission line 1062 are equal.

[0068] In some embodiments, the length L3 of the first microstrip line 1021 is 8.6 mm, and the lengths of the first microstrip line 1021 and the sixth microstrip line 1101 are equal.

[0069] In some embodiments, the length L4 of the first open branch 1022 is 2.3 mm, and the lengths of the first open branch 1022 and the second open branch 1102 are equal.

[0070] In some embodiments, the length L5 of the second microstrip line 1041 is 5.2 mm, and the length of the second microstrip line 1041 is equal to the length of the fifth microstrip line 1081 .

[0071] In some embodiments, the length L6 of the first short-circuit stub 1042 is 5.5 mm, and the lengths of the first short-circuit stub 1042 and the fourth short-circuit stub 1082 are equal.

[0072] In some embodiments, the length L7 of the fourth microstrip line 1071 is 5.5 mm, and the lengths of the third microstrip line 1051 and the fourth microstrip line 1071 are equal.

[0073] In some embodiments, the length L8 of the second short-circuit stub 1052 is 5.2 mm, and the lengths of the second short-circuit stub 1052 and the third short-circuit stub 1072 are equal.

[0074] In some embodiments, the width W3 of the first microstrip line 1021 is 0.4 mm, and the widths of the first microstrip line 1021 , the sixth microstrip line 1101 , the first open-circuit stub 1022 , and the second open-circuit stub 1102 are equal.

[0075] In some embodiments, the width W4 of the second microstrip line 1041 is 0.7 mm, and the widths of the second microstrip line 1041, the third microstrip line 1051, the fourth microstrip line 1071, the fifth microstrip line 1081, the first short-circuit branch 1042, the second short-circuit branch 1052, the third short-circuit branch 1072 and the fourth short-circuit branch 1082 are equal.

[0076] In this embodiment, by setting the first microstrip line 1021, the first open-circuit branch 1022, the sixth microstrip line 1101 and the second open-circuit branch 1102, a notch can be formed, and by setting the third microstrip line 1051, the fourth microstrip line 1071, the fifth microstrip line 1081, the first short-circuit branch 1042, the second short-circuit branch 1052, the third short-circuit branch 1072 and the fourth short-circuit branch 1082, a transmission pole can be formed in the passband to enhance the filter 1. The notch characteristic is improved, and the selectivity of the filter 1 is improved; in addition, through the third microstrip line 1051, the fourth microstrip line 1071, the fifth microstrip line 1081, the first short-circuit branch 1042, the second short-circuit branch 1052, the third short-circuit branch 1072 and the fourth short-circuit branch 1082 in conjunction with the above-mentioned first parallel line component 103, the second parallel line component 106 and the third parallel line component 109, it can be ensured that a plurality of transmission poles are formed in the passband, thereby improving the flatness in the passband.

[0077] In order to make the readers better understand the concept of this application, the following Figure 2 The simulation results in are explained in detail.

[0078] In this application, please refer to Figure 1, by connecting the two ends of the first microstrip line 1021 to the input end 101 and the first open-circuit branch 1022 respectively, connecting one end of the first parallel line component 103 to the input end 101, connecting one end of the second microstrip line 1041 and one end of the third microstrip line 1051 to the other end of the first parallel line component 103, connecting one end of the first short-circuit branch 1042 to the other end of the second microstrip line 1041, and connecting one end of the second short-circuit branch 1052 to the other end of the third microstrip line 1051. The second parallel line component 106 is disposed between the first short-circuit branch 1042 and the second short-circuit branch 1052, one end of the second parallel line component 106 is connected to the other end of the first parallel line component 103, one end of the fourth microstrip line 1071 is connected to the other end of the second parallel line component 106, one end of the third short-circuit branch 1072 is connected to the other end of the fourth microstrip line 1071, and the other end of the third short-circuit branch 1072 is connected to the other end of the first short-circuit branch 1042. One end of the fifth microstrip line 1081 is connected to the other end of the second parallel line component 106, one end of the fourth short-circuit branch 1082 is connected to the other end of the fifth microstrip line 1081, and the other end of the fourth short-circuit branch 1082 is connected to the other end of the second short-circuit branch 1052. One end of the third parallel line component 109 is connected to the other end of the second parallel line component 106, and the other end of the third parallel line component 109 is connected to the output end 111. One end of the sixth microstrip line 1101 is connected to the output end 111, and one end of the second open branch 1102 is connected to the other end of the sixth microstrip line 1101. Figure 2, so that the reflection coefficient in the frequency range of 2.27GHz to 7.29GHz is less than -10dB, the center frequency is 4.78GHz, the absolute bandwidth is 5.02GHz, the relative bandwidth is 105% (the ratio of absolute bandwidth to center frequency), and six transmission poles are formed in the passband, which are located at 2.32GHz, 2.68GHz, 4.48GHz, 5.26GHz, 6.32GHz and 7.16GHz respectively. If there is only one transmission pole in the passband, it is easy to cause the signal to decay rapidly, so that the power of the signal in the passband becomes inconsistent during the transmission process, affecting the communication capability. In the present application, there are six transmission poles in the passband. When the signal in the passband has just attenuated in the filter 1, there can be another transmission pole to enhance the signal, which is conducive to ensuring that the attenuation of the signal in the passband is kept within a stable range, and the attenuation of the signal in the passband can be reduced, which is conducive to ensuring the flatness of the signal in the RF device. Through the above settings, the present application can also form a transmission zero point in the passband, located at 4.88 GHz. By forming a transmission zero point in the passband, it is beneficial to enhance the notch characteristics of the filter 1, reduce in-band interference, and help expand the application range of the filter 1. In addition, through the above settings, the present application also forms four transmission zero points in the stopband (i.e., the frequency band outside the passband), which are located at 0 GHz, 1.3 GHz, 7.58 GHz and 10.86 GHz, respectively, thereby ensuring the high selectivity of the filter 1 and the high isolation of the stopband.

[0079] In the embodiment of the utility model, by setting the first topology structure 102 and the sixth topology structure 110, the filter 1 has a notch characteristic, and by setting the second topology structure 104, the third topology structure 105, the fourth topology structure 107 and the fifth topology structure 108, the filter 1 can form a transmission zero point in the passband, thereby enhancing the notch characteristic of the filter 1, reducing in-band interference, and helping to expand the application range of the filter 1.

[0080] The utility model further provides an electronic device embodiment, the electronic device includes the filter 1 mentioned above, the specific structure and function of the filter 1 can refer to the above embodiment, and will not be described one by one here.

[0081] The above description is only 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 specification 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 filter, characterized in that: include: Input terminal; A first topological structure, one end of which is electrically connected to the input end; A first parallel line component, one end of which is electrically connected to the input end; A second topological structure, one end of which is electrically connected to the other end of the first parallel line assembly; A third topological structure, one end of which is electrically connected to the other end of the first parallel line assembly, and the second topological structure and the third topological structure are respectively located on two sides of the first parallel line assembly; a second parallel line assembly, one end of which is electrically connected to the other end of the first parallel line assembly; a fourth topological structure, one end of which is electrically connected to the other end of the second parallel line assembly, and the other end of the fourth topological structure is electrically connected to the other end of the second topological structure; a fifth topological structure, one end of which is electrically connected to the other end of the second parallel line assembly, and the other end of the fifth topological structure is electrically connected to the other end of the third topological structure; a third parallel line assembly, one end of which is electrically connected to the other end of the second parallel line assembly, the first parallel line assembly, the second parallel line assembly and the third parallel line assembly being parallel to each other; a sixth topological structure, one end of which is electrically connected to the other end of the third parallel line assembly; An output end, the other end of the third parallel line assembly is electrically connected to the output end.

2. The filter according to claim 1, characterized in that The first topology structure includes a first microstrip line and a first open branch, one end of the first microstrip line is electrically connected to the input end, and one end of the first open branch is electrically connected to the other end of the first microstrip line.

3. The filter according to claim 1, characterized in that The first parallel line assembly includes a first transmission line and a second transmission line, one end of the first transmission line is electrically connected to the input end, the other end of the first transmission line extends toward one end of the second topological structure, the second transmission line is located between the first transmission line and the first topological structure, and the second transmission line is parallel to the first transmission line, and one end of the second topological structure and one end of the third topological structure are electrically connected to the second transmission line.

4. The filter according to claim 3, characterized in that The second topology structure includes a second microstrip line and a first short-circuit branch, one end of the second microstrip line is electrically connected to an end of the second transmission line away from the input end, one end of the first short-circuit branch is electrically connected to the other end of the second microstrip line, and the first short-circuit branch is parallel to the second parallel line component.

5. The filter according to claim 4, characterized in that The third topology structure includes a third microstrip line and a second short-circuit branch, one end of the third microstrip line is electrically connected to an end of the second transmission line away from the input end, one end of the second short-circuit branch is electrically connected to the other end of the third microstrip line, the second short-circuit branch is parallel to the second parallel line component, and the second parallel line component is located between the first short-circuit branch and the second short-circuit branch.

6. The filter according to claim 3, characterized in that The second parallel line assembly includes a third transmission line and a fourth transmission line which are parallel to each other, one end of the third transmission line is electrically connected to one end of the second topological structure, and the fourth transmission line is electrically connected to the fourth topological structure and the fifth topological structure.

7. The filter according to claim 4, characterized in that The fourth topology structure includes a fourth microstrip line and a third short-circuit branch, one end of the fourth microstrip line is electrically connected to the second parallel line component, one end of the third short-circuit branch is electrically connected to the other end of the fourth microstrip line, and the other end of the third short-circuit branch is electrically connected to the first short-circuit branch.

8. The filter according to claim 5, characterized in that The fifth topology structure includes a fifth microstrip line and a fourth short-circuit branch, one end of the fifth microstrip line is electrically connected to the second parallel line component, one end of the fourth short-circuit branch is electrically connected to the other end of the fifth microstrip line, and the other end of the fourth short-circuit branch is electrically connected to the second short-circuit branch.

9. The filter according to claim 1, characterized in that The sixth topology structure includes a sixth microstrip line and a second open branch, one end of the sixth microstrip line is electrically connected to the output end, and the other end of the sixth microstrip line is electrically connected to one end of the second open branch.

10. An electronic device, characterized in that: Comprising a filter as claimed in any one of claims 1 to 9.

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