Topological structure, filter and communication equipment

Abstract

The embodiment of the utility model relates to the technical field of filters, and particularly discloses a topological structure, a filter and communication equipment. Comprising an input end, an output end, a first parallel line, a first parallel three line, a second parallel three line, a first microstrip line, a second microstrip line, a third microstrip line, a fourth microstrip line, a fifth microstrip line, a sixth microstrip line, a seventh microstrip line, an eighth microstrip line, a ninth microstrip line, a tenth microstrip line, an eleventh microstrip line, a twelfth microstrip line, a thirteenth microstrip line and a fourteenth microstrip line. A fifteenth micro-strip line, a sixteenth micro-strip line, a seventeenth micro-strip line, an eighteenth micro-strip line, a nineteenth micro-strip line, a twentieth micro-strip 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, a fifth short-circuit branch knot, a sixth short-circuit branch knot, a seventh short-circuit branch knot and an eighth short-circuit branch knot are included. Through the above mode, the embodiment of the utility model has the characteristic of high selectivity.

Description

Technical Field

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

[0002] With the rapid development of modern wireless communication technology, the miniaturization of bandpass filters, as one of the key components of wireless communication systems, has extremely high scientific research value and has attracted the attention of many scholars.

[0003] In implementing the embodiments of this application, the inventors discovered that most miniaturized bandpass filters currently suffer from poor selectivity, which greatly limits their use in modern wireless communication systems. Utility Model Content

[0004] The present invention aims to provide a topology, filter, and communication device that have high selectivity.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this utility model embodiment is: providing a topology structure, including an input terminal, an output terminal, a first parallel line, a first three-parallel line, a second three-parallel line, a first microstrip line, a second microstrip line, a third microstrip line, a fourth microstrip line, a fifth microstrip line, a sixth microstrip line, a seventh microstrip line, an eighth microstrip line, a ninth microstrip line, a tenth microstrip line, an eleventh microstrip line, a twelfth microstrip line, a thirteenth microstrip line, a fourteenth microstrip line, a fifteenth microstrip line, a sixteenth microstrip line, a seventeenth microstrip line, an eighteenth microstrip line, and a tenth microstrip line. The system comprises a ninth microstrip line, a twentieth microstrip line, a first short-circuit stub, a second short-circuit stub, a third short-circuit stub, a fourth short-circuit stub, a fifth short-circuit stub, a sixth short-circuit stub, a seventh short-circuit stub, and an eighth short-circuit stub; wherein, one end of the first parallel line is connected to one end of the first parallel three-line, the first microstrip line, and the sixth microstrip line; the other end of the first parallel three-line is connected to the input terminal; the other end of the first microstrip line is connected to one end of the second microstrip line and the fourth microstrip line; and the other end of the second microstrip line is sequentially connected to the third microstrip line and the first short-circuit stub. The other end of the fourth microstrip line is sequentially connected to the fifth microstrip line and the second short-circuit stub; the other end of the sixth microstrip line is connected to one end of the seventh and ninth microstrip lines; the other end of the seventh microstrip line is sequentially connected to the eighth microstrip line and the third short-circuit stub; the other end of the ninth microstrip line is sequentially connected to the tenth microstrip line and the fourth short-circuit stub; the other end of the first parallel line is connected to one end of the second parallel three-line, the eleventh microstrip line, and the sixteenth microstrip line; the other end of the second parallel three-line is connected to the output terminal; the eleventh microstrip line... The other end of the line is connected to one end of the twelfth microstrip line and one end of the fourteenth microstrip line. The other end of the twelfth microstrip line is connected to the thirteenth microstrip line and the fifth short-circuit stub in sequence. The other end of the fourteenth microstrip line is connected to the fifteenth microstrip line and the sixth short-circuit stub in sequence. The other end of the sixteenth microstrip line is connected to one end of the seventeenth microstrip line and one end of the nineteenth microstrip line. The other end of the seventeenth microstrip line is connected to the eighteenth microstrip line and the seventh short-circuit stub in sequence. The other end of the nineteenth microstrip line is connected to the twentieth microstrip line and the eighth short-circuit stub in sequence.

[0006] Optionally, the first parallel line, the first three parallel lines, the second three parallel lines, the second microstrip line, the fourth microstrip line, the seventh microstrip line, the ninth microstrip line, the twelfth microstrip line, the fourteenth microstrip line, the seventeenth microstrip line, the nineteenth microstrip line, the first short-circuit stub, the second short-circuit stub, the third short-circuit stub, the fourth short-circuit stub, the fifth short-circuit stub, the sixth short-circuit stub, the seventh short-circuit stub, and the eighth short-circuit stub are parallel to each other and perpendicular to the first microstrip line, the third microstrip line, the fifth microstrip line, the sixth microstrip line, the eighth microstrip line, the tenth microstrip line, the eleventh microstrip line, the thirteenth microstrip line, the fifteenth microstrip line, the sixteenth microstrip line, the eighteenth microstrip line, and the twentieth microstrip line.

[0007] Optionally, the first and second parallel three lines are arranged symmetrically about the first parallel line; the second and fourth microstrip lines, the third and fifth microstrip lines, the first short-circuit stub and the second short-circuit stub are arranged symmetrically about the first microstrip line; the seventh and ninth microstrip lines, the eighth and tenth microstrip lines, the third short-circuit stub and the fourth short-circuit stub are arranged symmetrically about the sixth microstrip line; the twelfth and fourteenth microstrip lines, the thirteenth and fifteenth microstrip lines, the fifth short-circuit stub and the sixth short-circuit stub are arranged symmetrically about the eleventh microstrip line; the seventeenth and nineteenth microstrip lines, the eighteenth and twentieth microstrip lines, the seventh short-circuit stub and the eighth short-circuit stub are arranged symmetrically about the eleventh microstrip line. The sixteenth microstrip line is symmetrically arranged from left to right; the first and sixth microstrip lines, the second and seventh microstrip lines, the third and eighth microstrip lines, and the first and third short-circuit stubs are symmetrically arranged about the first three parallel lines; the fourth and ninth microstrip lines, the fifth and tenth microstrip lines, the twelfth and seventeenth microstrip lines, the thirteenth and eighteenth microstrip lines, the second and fourth short-circuit stubs, and the fifth and seventh short-circuit stubs are symmetrically arranged about the first parallel lines; the eleventh and sixteenth microstrip lines, the fourteenth and nineteenth microstrip lines, the fifteenth and twentieth microstrip lines, and the sixth and eighth short-circuit stubs are symmetrically arranged about the second three parallel lines.

[0008] Optionally, the electrical lengths of the first parallel line, the first three parallel lines, and the second three parallel lines are equal; the electrical lengths of the first microstrip line, the sixth microstrip line, the eleventh microstrip line, and the sixteenth microstrip line are equal; the electrical lengths of the second microstrip line, the fourth microstrip line, the seventh microstrip line, the ninth microstrip line, the twelfth microstrip line, the fourteenth microstrip line, the seventeenth microstrip line, and the nineteenth microstrip line are equal; The electrical lengths of the third, fifth, eighth, tenth, thirteenth, fifteenth, eighteenth, and twentieth microstrip lines are equal; the electrical lengths of the first, second, third, fourth, fifth, sixth, seventh, and eighth short-circuit stubs are also equal.

[0009] Optionally, the sum of the electrical lengths of the first microstrip line, the second microstrip line, the third microstrip line, and the first short-circuit stub is greater than the electrical length of the first parallel line.

[0010] Optionally, the electrical lengths of the first parallel line, the first three parallel lines, and the second three parallel lines are all equal to one-quarter wavelength at the center frequency of the filter.

[0011] Optionally, the characteristic impedances of the first microstrip line, the sixth microstrip line, the eleventh microstrip line, and the sixteenth microstrip line are all equal; the characteristic impedances of the second microstrip line, the third microstrip line, the fourth microstrip line, the fifth microstrip line, the seventh microstrip line, the eighth microstrip line, the ninth microstrip line, the tenth microstrip line, the twelfth microstrip line, the thirteenth microstrip line, the fourteenth microstrip line, the fifteenth microstrip line, the seventeenth microstrip line, the eighteenth microstrip line, the nineteenth microstrip line, the twentieth microstrip line, the first short-circuit stub, the second short-circuit stub, the third short-circuit stub, the fourth short-circuit stub, the fifth short-circuit stub, the sixth short-circuit stub, the seventh short-circuit stub, and the eighth short-circuit stub are all equal.

[0012] Optionally, the characteristic impedance of the second microstrip line is twice the characteristic impedance of the first microstrip line.

[0013] To solve the above-mentioned technical problems, another technical solution adopted in this utility model embodiment is to provide a filter including the above-mentioned topology.

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

[0015] The beneficial effects of this utility model embodiment are as follows: Unlike the prior art, this utility model embodiment provides a topology structure, including an input terminal, an output terminal, a first parallel line, a first three-parallel line, a second three-parallel line, a first microstrip line, a second microstrip line, a third microstrip line, a fourth microstrip line, a fifth microstrip line, a sixth microstrip line, a seventh microstrip line, an eighth microstrip line, a ninth microstrip line, a tenth microstrip line, an eleventh microstrip line, a twelfth microstrip line, a thirteenth microstrip line, a fourteenth microstrip line, a fifteenth microstrip line, and a sixteenth microstrip line. Microstrip line, seventeenth microstrip line, eighteenth microstrip line, nineteenth microstrip line, twentieth microstrip line, first short-circuit stub, second short-circuit stub, third short-circuit stub, fourth short-circuit stub, fifth short-circuit stub, sixth short-circuit stub, seventh short-circuit stub, and eighth short-circuit stub; wherein, one end of the first parallel line is connected to one end of the first parallel tri-line, the first microstrip line, and the sixth microstrip line; the other end of the first parallel tri-line is connected to the input terminal; the other end of the first microstrip line is connected to one end of the second microstrip line and the fourth microstrip line; the other end of the second microstrip line... One end of the fourth microstrip line is connected sequentially to the third microstrip line and the first short-circuit stub. The other end of the fourth microstrip line is connected sequentially to the fifth microstrip line and the second short-circuit stub. The other end of the sixth microstrip line is connected to one end of the seventh and ninth microstrip lines. The other end of the seventh microstrip line is connected sequentially to the eighth microstrip line and the third short-circuit stub. The other end of the ninth microstrip line is connected sequentially to the tenth microstrip line and the fourth short-circuit stub. The other end of the first parallel line is connected to one end of the second parallel three-line, the eleventh microstrip line, and the sixteenth microstrip line. The other end of the second parallel three-line is connected to the output. The other end of the eleventh microstrip line is connected to one end of the twelfth and fourteenth microstrip lines. The other end of the twelfth microstrip line is connected to the thirteenth microstrip line and the fifth short-circuit stub in sequence. The other end of the fourteenth microstrip line is connected to the fifteenth microstrip line and the sixth short-circuit stub in sequence. The other end of the sixteenth microstrip line is connected to one end of the seventeenth and nineteenth microstrip lines. The other end of the seventeenth microstrip line is connected to the eighteenth microstrip line and the seventh short-circuit stub in sequence. The other end of the nineteenth microstrip line is connected to the twentieth microstrip line and the eighth short-circuit stub in sequence.

[0016] Through the above methods, the embodiments of this utility model can have the characteristics of high selectivity, accurately receive signals of the target frequency, suppress signals of other frequencies, reduce interference, effectively filter out unnecessary signals, and improve signal quality. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments of this utility model or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale.

[0018] Figure 1This is a schematic diagram of the overall structure of the topology provided in this embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of a simulation example of the topology provided in this embodiment of the utility model;

[0020] Figure 3 This is an S-parameter diagram of a simulation example of the topology provided in this embodiment of the utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 11 input terminals;

[0023] 21 output terminals;

[0024] 31. First parallel line;

[0025] 41 First parallel tri-line; 42 Second parallel tri-line;

[0026] 51 First microstrip line, 52 Second microstrip line, 53 Third microstrip line, 54 Fourth microstrip line, 55 Fifth microstrip line, 56 Sixth microstrip line, 57 Seventh microstrip line, 58 Eighth microstrip line, 59 Ninth microstrip line, 510 Tenth microstrip line, 511 Eleventh microstrip line, 512 Twelfth microstrip line, 513 Thirteenth microstrip line, 514 Fourteenth microstrip line, 515 Fifteenth microstrip line, 516 Sixteenth microstrip line, 517 Seventeenth microstrip line, 518 Eighteenth microstrip line, 519 Nineteenth microstrip line, 520 Twentieth microstrip line;

[0027] 61 First short-circuit branch, 62 Second short-circuit branch, 63 Third short-circuit branch, 64 Fourth short-circuit branch, 65 Fifth short-circuit branch, 66 Sixth short-circuit branch;

[0028] 100 topology. Detailed Implementation

[0029] 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 "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 "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 "upper," "lower," "inner," "outer," "vertical," "horizontal," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] 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.

[0031] With the rapid development of modern wireless communication technology, the miniaturization of bandpass filters, as one of the key components of wireless communication systems, has extremely high scientific research value and has attracted the attention of many scholars.

[0032] In implementing the embodiments of this application, the inventors discovered that most miniaturized bandpass filters currently suffer from poor selectivity, which greatly limits their use in modern wireless communication systems.

[0033] In view of this, the present invention provides an embodiment of a topology 100. The bandpass filter designed based on this topology 100 can have high selectivity, accurately receive signals of the target frequency, suppress signals of other frequencies, reduce interference, effectively filter out unnecessary signals, and improve signal quality.

[0034] To facilitate the reader's understanding of the concept of this utility model embodiment, the specific structure of the topology 100 is described below:

[0035] Please see Figure 1A topology 100 includes an input terminal 11, an output terminal 21, a first parallel line 31, a first three-parallel line 41, a second three-parallel line 42, a first microstrip line 51, a second microstrip line 52, a third microstrip line 53, a fourth microstrip line 54, a fifth microstrip line 55, a sixth microstrip line 56, a seventh microstrip line 57, an eighth microstrip line 58, a ninth microstrip line 59, a tenth microstrip line 510, an eleventh microstrip line 511, a twelfth microstrip line 512, a thirteenth microstrip line 513, a fourteenth microstrip line 514, a fifteenth microstrip line 515, a sixteenth microstrip line 516, a seventeenth microstrip line 517, and an eighteenth microstrip line 518. The nineteenth microstrip line 519, the twentieth microstrip line 520, the first short-circuit stub 61, the second short-circuit stub 62, the third short-circuit stub 63, the fourth short-circuit stub 64, the fifth short-circuit stub 65, the sixth short-circuit stub 66, the seventh short-circuit stub 67, and the eighth short-circuit stub 68; wherein, one end of the first parallel line 31 is connected to one end of the first parallel three-line 41, the first microstrip line 51, and the sixth microstrip line 56; the other end of the first parallel three-line 41 is connected to the input terminal 11; the other end of the first microstrip line 51 is connected to one end of the second microstrip line 52 and the fourth microstrip line 54; and the other end of the second microstrip line 52 is sequentially connected to the third microstrip line 53 and... The first short-circuit stub 61, the other end of the fourth microstrip line 54 is sequentially connected to the fifth microstrip line 55 and the second short-circuit stub 62, the other end of the sixth microstrip line 56 is connected to one end of the seventh microstrip line 57 and the ninth microstrip line 59, the other end of the seventh microstrip line 57 is sequentially connected to the eighth microstrip line 58 and the third short-circuit stub 63, the other end of the ninth microstrip line 59 is sequentially connected to the tenth microstrip line 510 and the fourth short-circuit stub 64; the other end of the first parallel line 31 is connected to one end of the second parallel triple line 42, the eleventh microstrip line 511 and the sixteenth microstrip line 516, the other end of the second parallel triple line 42 is connected to the output terminal 21, the eleventh microstrip line 511... The other end of line 1 is connected to one end of the twelfth microstrip line 512 and the fourteenth microstrip line 514. The other end of the twelfth microstrip line 512 is connected to the thirteenth microstrip line 513 and the fifth short-circuit stub 65 in sequence. The other end of the fourteenth microstrip line 514 is connected to the fifteenth microstrip line 515 and the sixth short-circuit stub 66 in sequence. The other end of the sixteenth microstrip line 516 is connected to one end of the seventeenth microstrip line 517 and the nineteenth microstrip line 519. The other end of the seventeenth microstrip line 517 is connected to the eighteenth microstrip line 518 and the seventh short-circuit stub 67 in sequence. The other end of the nineteenth microstrip line 519 is connected to the twentieth microstrip line 520 and the eighth short-circuit stub 68 in sequence.

[0036] In the above manner, the combination of parallel lines, multiple parallel tri-lines, multiple microstrip lines, and multiple short-circuit stubs can generate multiple resonant peaks and help to form a narrower passband, thereby suppressing unwanted frequency ranges and improving the selectivity of topology 100.

[0037] In some embodiments, the following microstrip lines are defined: first parallel line 31, first three-parallel line 41, second three-parallel line 42, second microstrip line 52, fourth microstrip line 54, seventh microstrip line 57, ninth microstrip line 59, twelfth microstrip line 512, fourteenth microstrip line 514, seventeenth microstrip line 517, nineteenth microstrip line 519, first short-circuit stub 61, second short-circuit stub 62, third short-circuit stub 63, fourth short-circuit stub 64, and fifth short-circuit stub. 65, the sixth short-circuit branch 66, the seventh short-circuit branch 67, and the eighth short-circuit branch 68 are parallel to each other and are all perpendicular to the first microstrip line 51, the third microstrip line 53, the fifth microstrip line 55, the sixth microstrip line 56, the eighth microstrip line 58, the tenth microstrip line 510, the eleventh microstrip line 511, the thirteenth microstrip line 513, the fifteenth microstrip line 515, the sixteenth microstrip line 516, the eighteenth microstrip line 518, and the twentieth microstrip line 520.

[0038] By employing the methods described above, the perpendicularity or parallelism of parallel lines, multiple parallel tri-lines, multiple microstrip lines, and multiple short-circuit stubs can improve the compactness of the overall structure, helping to reduce its overall volume and thus the volume of the topology 100, thereby achieving miniaturization of the topology 100. Furthermore, by employing the methods described above, the perpendicularity or parallelism of parallel lines, multiple parallel tri-lines, multiple microstrip lines, and multiple short-circuit stubs can control the geometry of the topology 100, ensuring that the signal flows along a predetermined path, avoiding unnecessary reflections or coupling, thereby improving signal clarity and stability, and ultimately enhancing the selectivity of the topology 100.

[0039] In some embodiments, the first parallel tri-line 41 and the second parallel tri-line 42 are arranged symmetrically about the first parallel line 31; the second microstrip line 52 and the fourth microstrip line 54, the third microstrip line 53 and the fifth microstrip line 55, the first short-circuit stub 61 and the second short-circuit stub 62 are arranged symmetrically about the first microstrip line 51; the seventh microstrip line 57 and the ninth microstrip line 59, the eighth microstrip line 58 and the tenth microstrip line 510, the third short-circuit stub 63 and the fourth short-circuit stub 64 is symmetrically arranged about the sixth microstrip line 56; the twelfth microstrip line 512 and the fourteenth microstrip line 514, the thirteenth microstrip line 513 and the fifteenth microstrip line 515, the fifth short-circuit stub 65 and the sixth short-circuit stub 66 are symmetrically arranged about the eleventh microstrip line 511; the seventeenth microstrip line 517 and the nineteenth microstrip line 519, the eighteenth microstrip line 518 and the twentieth microstrip line 520, the seventh short-circuit stub 67 and the eighth short-circuit stub 68 are symmetrically arranged about the sixteenth microstrip line 511. Microstrip line 516 is arranged symmetrically from left to right; the first microstrip line 51 and the sixth microstrip line 56, the second microstrip line 52 and the seventh microstrip line 57, the third microstrip line 53 and the eighth microstrip line 58, the first short-circuit stub 61 and the third short-circuit stub 63 are arranged symmetrically from top to bottom about the first parallel three-line 41; the fourth microstrip line 54 and the ninth microstrip line 59, the fifth microstrip line 55 and the tenth microstrip line 510, the twelfth microstrip line 512 and the seventeenth microstrip line 517, and the thirteenth microstrip line... Microstrip line 513 and the eighteenth microstrip line 518, the second short-circuit branch 62 and the fourth short-circuit branch 64, the fifth short-circuit branch 65 and the seventh short-circuit branch 67 are symmetrical about the first parallel line 31; microstrip line 511 and the sixteenth microstrip line 516, the fourteenth microstrip line 514 and the nineteenth microstrip line 519, the fifteenth microstrip line 515 and the twentieth microstrip line 520, the sixth short-circuit branch 66 and the eighth short-circuit branch 68 are symmetrical about the second parallel line 42.

[0040] In this way, the symmetrical structure of parallel lines, multiple parallel tri-lines, multiple microstrip lines, and multiple short-circuit stubs helps to maintain consistent responses in different parts of the topology 100, avoids distortion caused by structural asymmetry, and reduces parasitic coupling effects, thereby effectively controlling the bandwidth of the topology 100 and improving the selectivity of the topology 100.

[0041] In some embodiments, the electrical lengths of the first parallel line 31, the first parallel tri-line 41, and the second parallel tri-line are equal; the electrical lengths of the first microstrip line 51, the sixth microstrip line 56, the eleventh microstrip line 511, and the sixteenth microstrip line 516 are equal; the electrical lengths of the second microstrip line 52, the fourth microstrip line 54, the seventh microstrip line 57, the ninth microstrip line 59, the twelfth microstrip line 512, the fourteenth microstrip line 514, the seventeenth microstrip line 517, and the nineteenth microstrip line 519 are equal; the third microstrip line 51... The electrical lengths of microstrip line 53, 55, 58, 510, 513, 515, 518, and 520 are equal. The electrical lengths of short-circuit stub 61, 62, 63, 64, 65, 66, 67, and 68 are also equal. Furthermore, the electrical lengths of the first parallel line 31, the first three parallel lines 41, and the second three parallel lines are all equal to one-quarter wavelength at the filter's center frequency.

[0042] By employing the above method, the electrical lengths of parallel lines, multiple parallel tri-lines, multiple microstrip lines, and multiple short-circuited stubs are equal, which enables more precise control of the yoke passband frequency of the topology 100 and helps to achieve higher selectivity.

[0043] Furthermore, in some embodiments, the sum of the electrical lengths of the first microstrip line 51, the second microstrip line 52, the third microstrip line 53, and the first short-circuit stub 61 is greater than the electrical length of the first parallel line 31.

[0044] Correspondingly, the sum of the electrical lengths of the first microstrip line 51, the fourth microstrip line 54, the fifth microstrip line 55, and the second short-circuit stub 62 is greater than the electrical length of the first parallel line 31; the sum of the electrical lengths of the sixth microstrip line 56, the seventh microstrip line 57, the eighth microstrip line 58, and the third short-circuit stub 63 is greater than the electrical length of the first parallel line 31; the sum of the electrical lengths of the sixth microstrip line 56, the ninth microstrip line 59, the tenth microstrip line 510, and the fourth short-circuit stub 64 is greater than the electrical length of the first parallel line 31; the sum of the electrical lengths of the eleventh microstrip line 511, the twelfth microstrip line 512, and the thirteenth microstrip line 513 is greater than the electrical length of the first parallel line 31; and the sum of the electrical lengths of the eleventh microstrip line 511, the twelfth microstrip line 512, and the thirteenth microstrip line 513 is greater than the electrical length of the first parallel line 31. The sum of the electrical lengths of the first parallel line 31, the fourteenth microstrip line 514, the fifteenth microstrip line 515, and the sixth short-circuit stub 66 is greater than the electrical length of the first parallel line 31; the sum of the electrical lengths of the sixteenth microstrip line 517, the seventeenth microstrip line 518, and the seventh short-circuit stub 67 is greater than the electrical length of the first parallel line 31; the sum of the electrical lengths of the sixteenth microstrip line 516, the nineteenth microstrip line 519, the twentieth microstrip line 520, and the eighth short-circuit stub 68 is greater than the electrical length of the first parallel line 31.

[0045] In some embodiments, the characteristic impedances of the first microstrip line 51, the sixth microstrip line 56, the eleventh microstrip line 511, and the sixteenth microstrip line 516 are all equal; the characteristic impedances of the second microstrip line 52, the third microstrip line 53, the fourth microstrip line 54, the fifth microstrip line 55, the seventh microstrip line 57, the eighth microstrip line 58, the ninth microstrip line 59, the tenth microstrip line 510, the twelfth microstrip line 512, the thirteenth microstrip line 513, and the sixth microstrip line 516 are all equal. The characteristic impedances of the fourteenth microstrip line 514, the fifteenth microstrip line 515, the seventeenth microstrip line 517, the eighteenth microstrip line 518, the nineteenth microstrip line 519, the twentieth microstrip line 520, the first short-circuit stub 61, the second short-circuit stub 62, the third short-circuit stub 63, the fourth short-circuit stub 64, the fifth short-circuit stub 65, the sixth short-circuit stub 66, the seventh short-circuit stub 67, and the eighth short-circuit stub 68 are all equal.

[0046] By employing the above methods, the characteristic impedances of parallel lines, multiple parallel tri-lines, multiple microstrip lines, and multiple short-circuit stubs are equal, which can improve the impedance matching uniformity of the topology 100, reduce signal reflection and interference, and help achieve higher selectivity.

[0047] Furthermore, in some embodiments, the characteristic impedance of the second microstrip line 52 is twice the characteristic impedance of the first microstrip line 51.

[0048] Correspondingly, the characteristic impedances of the second microstrip line 52, the third microstrip line 53, the fourth microstrip line 54, the fifth microstrip line 55, the seventh microstrip line 57, the eighth microstrip line 58, the ninth microstrip line 59, the tenth microstrip line 510, the twelfth microstrip line 512, the thirteenth microstrip line 513, the fourteenth microstrip line 514, the fifteenth microstrip line 515, the seventeenth microstrip line 517, the eighteenth microstrip line 518, and the tenth microstrip line 519 are also characteristic impedances. The characteristic impedances of the ninth microstrip line 519, the twentieth microstrip line 520, the first short-circuit stub 61, the second short-circuit stub 62, the third short-circuit stub 63, the fourth short-circuit stub 64, the fifth short-circuit stub 65, the sixth short-circuit stub 66, the seventh short-circuit stub 67, and the eighth short-circuit stub 68 are all twice the characteristic impedances of the first microstrip line 51, the sixth microstrip line 56, the eleventh microstrip line 511, or the sixteenth microstrip line 516.

[0049] To facilitate readers' understanding of the concept of this utility model embodiment, a simulation example of the topology 100 is provided below:

[0050] Please see Figure 2 The topology 100 is mounted on a circuit board (not shown). The circuit board (not shown) measures 34.4mm x 10.1mm, has a thickness of 0.813mm, a dielectric constant of 3.38, a dielectric loss of 0.0022, and is made of Rogers RO4003C material. The specific dimensional parameters of the topology 100 are: T =9.6mm, s T =0.1mm, w T =0.3mm, l p =9.6mm, s p =0.15mm, w p=0.25mm, l1=4.15mm, w1=1.0mm, l2=3.8mm, w2=0.5mm, l3=2.4mm, w3=0.5mm, l4=1.8mm, w4=0.5mm. Among them, l T The lengths of the first parallel tri-line 41 and the second parallel tri-line 42; s T The spacing between the individual lines of the first parallel tri-line 41 or the spacing between the individual lines of the second parallel tri-line 42; w T The width of a single line of the first parallel tri-line 41 or the width of a single line of the second parallel tri-line 42; p The length of the first parallel line 31; s p The spacing between the individual lines of the first parallel line 31; w p l1 is the width of a single line of the first parallel line 31; l1 is the length of the first microstrip line 51, the sixth microstrip line 56, the eleventh microstrip line 511, and the sixteenth microstrip line 516; w1 is the width of the first microstrip line 51, the sixth microstrip line 56, the eleventh microstrip line 511, and the sixteenth microstrip line 516; l2 is the width of the second microstrip line 52, the fourth microstrip line 54, the seventh microstrip line 57, the ninth microstrip line 59, and the twelfth microstrip line 51. 2. The lengths of the fourteenth microstrip line 514, the seventeenth microstrip line 517, and the nineteenth microstrip line 519; w2 is the width of the second microstrip line 52, the fourth microstrip line 54, the seventh microstrip line 57, the ninth microstrip line 59, the twelfth microstrip line 512, the fourteenth microstrip line 514, the seventeenth microstrip line 517, and the nineteenth microstrip line 519; l3 is the width of the third microstrip line 53, the fifth microstrip line 55, the eighth microstrip line 58, and the tenth microstrip line 519. The lengths of microstrip lines 510, 513, 515, 518, and 520; w3 is the width of microstrip lines 53, 55, 58, 510, 513, 515, 518, and 520; l4 is the width of microstrip line 510, 513, 515, 518, and 520; and the lengths of microstrip lines 510, 513, 515, 518, and 520 are also specified. The lengths of the second short-circuit branch 62, the third short-circuit branch 63, the fourth short-circuit branch 64, the fifth short-circuit branch 65, the sixth short-circuit branch 66, the seventh short-circuit branch 67, and the eighth short-circuit branch 68; w4 is the width of the first short-circuit branch 61, the second short-circuit branch 62, the third short-circuit branch 63, the fourth short-circuit branch 64, the fifth short-circuit branch 65, the sixth short-circuit branch 66, the seventh short-circuit branch 67, and the eighth short-circuit branch 68.

[0051] Please see Figure 3The figure shows the S-parameters of a simulation example of topology 100, specifically: its passband range with a reflection coefficient better than -10dB is 2.59GHz-7.13GHz, its center frequency is 4.86GHz, its absolute bandwidth is 4.54GHz, and its relative bandwidth is 93.4%. Furthermore, the passband has five transmission poles located at 2.7GHz, 3.14GHz, 4.78GHz, 6.78GHz, and 7.04GHz, ensuring the flatness of the passband; the stopband has seven transmission zeros located at 0GHz, 0.26GHz, 0.78GHz, 7.72GHz, 8.48GHz, 9.26GHz, and 10.68GHz, ensuring the high selectivity and wide stopband of topology 100.

[0052] Through the simulation examples of the above topology 100, it can be verified that the bandpass filter designed based on the above topology 100 has the characteristics of high selectivity and wide stopband.

[0053] This utility model embodiment provides a topology 100, including an input terminal 11, an output terminal 21, a first parallel line 31, a first three-parallel line 41, a second three-parallel line 42, a first microstrip line 51, a second microstrip line 52, a third microstrip line 53, a fourth microstrip line 54, a fifth microstrip line 55, a sixth microstrip line 56, a seventh microstrip line 57, an eighth microstrip line 58, a ninth microstrip line 59, a tenth microstrip line 510, an eleventh microstrip line 511, a twelfth microstrip line 512, a thirteenth microstrip line 513, a fourteenth microstrip line 514, a fifteenth microstrip line 515, a sixteenth microstrip line 516, a seventeenth microstrip line 517, and a tenth microstrip line 518. The system includes eight microstrip lines 518, nineteenth microstrip line 519, twentieth microstrip line 520, first short-circuit stub 61, second short-circuit stub 62, third short-circuit stub 63, fourth short-circuit stub 64, fifth short-circuit stub 65, sixth short-circuit stub 66, seventh short-circuit stub 67, and eighth short-circuit stub 68. One end of the first parallel line 31 connects to one end of the first parallel three-line 41, the first microstrip line 51, and the sixth microstrip line 56; the other end of the first parallel three-line 41 connects to the input terminal 11; the other end of the first microstrip line 51 connects to one end of the second microstrip line 52 and the fourth microstrip line 54; and the other end of the second microstrip line 52 connects sequentially to the third microstrip line 54. Line 53 and the first short-circuit stub 61, the other end of the fourth microstrip line 54 is connected in sequence to the fifth microstrip line 55 and the second short-circuit stub 62, the other end of the sixth microstrip line 56 is connected to one end of the seventh microstrip line 57 and the ninth microstrip line 59, the other end of the seventh microstrip line 57 is connected in sequence to the eighth microstrip line 58 and the third short-circuit stub 63, the other end of the ninth microstrip line 59 is connected in sequence to the tenth microstrip line 510 and the fourth short-circuit stub 64; the other end of the first parallel line 31 is connected to one end of the second parallel three-line 42, the eleventh microstrip line 511 and the sixteenth microstrip line 516, the other end of the second parallel three-line 42 is connected to the output terminal 21, the eleventh microstrip line The other end of microstrip line 511 is connected to one end of the twelfth microstrip line 512 and the fourteenth microstrip line 514. The other end of the twelfth microstrip line 512 is sequentially connected to the thirteenth microstrip line 513 and the fifth short-circuit stub 65. The other end of the fourteenth microstrip line 514 is sequentially connected to the fifteenth microstrip line 515 and the sixth short-circuit stub 66. The other end of the sixteenth microstrip line 516 is connected to one end of the seventeenth microstrip line 517 and the nineteenth microstrip line 519. The other end of the seventeenth microstrip line 517 is sequentially connected to the eighteenth microstrip line 518 and the seventh short-circuit stub 67. The other end of the nineteenth microstrip line 519 is sequentially connected to the twentieth microstrip line 520 and the eighth short-circuit stub 68. Through the above method, this embodiment of the invention can have high selectivity, accurately receive signals of the target frequency, suppress signals of other frequencies, reduce interference, effectively filter out unnecessary signals, and improve signal quality.

[0054] This utility model also provides an embodiment of a filter, which includes the above-described topology 100. For the specific structure and function of the above-described topology 100, please refer to the above embodiments, which will not be repeated here.

[0055] This utility model also provides an embodiment of a communication device, which includes the above-mentioned filter. For the specific structure and function of the filter, please refer to the above embodiment, which will not be repeated here.

[0056] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A topological structure, characterized in that, It includes an input terminal, an output terminal, a first parallel line, a first three-parallel line, a second three-parallel line, a first microstrip line, a second microstrip line, a third microstrip line, a fourth microstrip line, a fifth microstrip line, a sixth microstrip line, a seventh microstrip line, an eighth microstrip line, a ninth microstrip line, a tenth microstrip line, an eleventh microstrip line, a twelfth microstrip line, a thirteenth microstrip line, a fourteenth microstrip line, a fifteenth microstrip line, a sixteenth microstrip line, a seventeenth microstrip line, an eighteenth microstrip line, a nineteenth microstrip line, a twentieth microstrip line, a first short-circuit stub, a second short-circuit stub, a third short-circuit stub, a fourth short-circuit stub, a fifth short-circuit stub, a sixth short-circuit stub, a seventh short-circuit stub, and an eighth short-circuit stub; Wherein, one end of the first parallel line is connected to one end of the first parallel three lines, the first microstrip line, and the sixth microstrip line; the other end of the first parallel three lines is connected to the input terminal; the other end of the first microstrip line is connected to one end of the second microstrip line and the fourth microstrip line; the other end of the second microstrip line is sequentially connected to the third microstrip line and the first short-circuit stub; the other end of the fourth microstrip line is sequentially connected to the fifth microstrip line and the second short-circuit stub; the other end of the sixth microstrip line is connected to one end of the seventh microstrip line and the ninth microstrip line; the other end of the seventh microstrip line is sequentially connected to the eighth microstrip line and the third short-circuit stub; and the other end of the ninth microstrip line is sequentially connected to the tenth microstrip line and the fourth short-circuit stub. The other end of the first parallel line is connected to one end of the second parallel three-line, the eleventh microstrip line, and the sixteenth microstrip line. The other end of the second parallel three-line is connected to the output terminal. The other end of the eleventh microstrip line is connected to one end of the twelfth microstrip line and the fourteenth microstrip line. The other end of the twelfth microstrip line is sequentially connected to the thirteenth microstrip line and the fifth short-circuit stub. The other end of the fourteenth microstrip line is sequentially connected to the fifteenth microstrip line and the sixth short-circuit stub. The other end of the sixteenth microstrip line is connected to one end of the seventeenth microstrip line and the nineteenth microstrip line. The other end of the seventeenth microstrip line is sequentially connected to the eighteenth microstrip line and the seventh short-circuit stub. The other end of the nineteenth microstrip line is sequentially connected to the twentieth microstrip line and the eighth short-circuit stub.

2. The topology according to claim 1, characterized in that, The first parallel line, the first three parallel lines, the second three parallel lines, the second microstrip line, the fourth microstrip line, the seventh microstrip line, the ninth microstrip line, the twelfth microstrip line, the fourteenth microstrip line, the seventeenth microstrip line, the nineteenth microstrip line, the first short-circuit stub, the second short-circuit stub, the third short-circuit stub, the fourth short-circuit stub, the fifth short-circuit stub, the sixth short-circuit stub, the seventh short-circuit stub, and the eighth short-circuit stub are parallel to each other and are all perpendicular to the first microstrip line, the third microstrip line, the fifth microstrip line, the sixth microstrip line, the eighth microstrip line, the tenth microstrip line, the eleventh microstrip line, the thirteenth microstrip line, the fifteenth microstrip line, the sixteenth microstrip line, the eighteenth microstrip line, and the twentieth microstrip line.

3. The topology according to claim 1, characterized in that, The first and second parallel tri-line lines are arranged symmetrically about the first parallel line. The second and fourth microstrip lines, the third and fifth microstrip lines, the first short-circuit stub and the second short-circuit stub are arranged symmetrically about the first microstrip line. The seventh and ninth microstrip lines, the eighth and tenth microstrip lines, the third short-circuit stub and the fourth short-circuit stub are arranged symmetrically about the sixth microstrip line. The twelfth and fourteenth microstrip lines, the thirteenth and fifteenth microstrip lines, the fifth short-circuit stub and the sixth short-circuit stub are arranged symmetrically about the eleventh microstrip line. The seventeenth microstrip line, the nineteenth microstrip line, the eighteenth microstrip line, the twentieth microstrip line, the seventh short-circuit stub, and the eighth short-circuit stub are arranged symmetrically about the sixteenth microstrip line. The first microstrip line and the sixth microstrip line, the second microstrip line and the seventh microstrip line, the third microstrip line and the eighth microstrip line, the first short-circuit stub and the third short-circuit stub are symmetrically arranged about the first parallel three lines; The fourth and ninth microstrip lines, the fifth and tenth microstrip lines, the twelfth and seventeenth microstrip lines, the thirteenth and eighteenth microstrip lines, the second and fourth short-circuit stubs, and the fifth and seventh short-circuit stubs are symmetrical about the first parallel line. The eleventh and sixteenth microstrip lines, the fourteenth and nineteenth microstrip lines, the fifteenth and twentieth microstrip lines, the sixth short-circuit stub and the eighth short-circuit stub are symmetrical about the second parallel three lines.

4. The topology according to claim 1, characterized in that, The electrical lengths of the first parallel line, the first three parallel lines, and the second three parallel lines are equal. The electrical lengths of the first microstrip line, the sixth microstrip line, the eleventh microstrip line, and the sixteenth microstrip line are equal. The electrical lengths of the second microstrip line, the fourth microstrip line, the seventh microstrip line, the ninth microstrip line, the twelfth microstrip line, the fourteenth microstrip line, the seventeenth microstrip line, and the nineteenth microstrip line are equal. The electrical lengths of the third microstrip line, the fifth microstrip line, the eighth microstrip line, the tenth microstrip line, the thirteenth microstrip line, the fifteenth microstrip line, the eighteenth microstrip line, and the twentieth microstrip line are equal. The electrical lengths of the first short-circuit stub, the second short-circuit stub, the third short-circuit stub, the fourth short-circuit stub, the fifth short-circuit stub, the sixth short-circuit stub, the seventh short-circuit stub, and the eighth short-circuit stub are equal.

5. The topology according to claim 4, characterized in that, The sum of the electrical lengths of the first microstrip line, the second microstrip line, the third microstrip line, and the first short-circuit stub is greater than the electrical length of the first parallel line.

6. The topology according to claim 4, characterized in that, The electrical lengths of the first parallel line, the first three parallel lines, and the second three parallel lines are all equal to one-quarter of the wavelength corresponding to the center frequency of the filter.

7. The topology according to claim 1, characterized in that, The characteristic impedances of the first microstrip line, the sixth microstrip line, the eleventh microstrip line, and the sixteenth microstrip line are all equal. The characteristic impedances of the second, third, fourth, fifth, seventh, eighth, ninth, tenth, twelfth, thirteenth, fourteenth, fifteenth, seventeenth, eighteenth, nineteenth, and twentieth microstrip lines, as well as the characteristic impedances of the first, second, third, fourth, fifth, sixth, seventh, and eighth short-circuit stubs, are all equal.

8. The topology according to claim 7, characterized in that, The characteristic impedance of the second microstrip line is twice that of the characteristic impedance of the first microstrip line.

9. A filter, characterized in that, Includes the topology as described in any one of claims 1-8.

10. A communication device, characterized in that, Includes the filter as described in any one of claims 1-9.

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