Periodic branch microstrip double-line with wing-type compensation structure for suppressing microstrip line far-end crosstalk

Abstract

The invention discloses a periodic branch microstrip double-line with a wing-shaped compensation structure for suppressing microstrip line far-end crosstalk, and the periodic branch microstrip double-line comprises two parallel periodic branch microstrip lines, and discrete wing-shaped compensation units which are uniformly distributed between the two periodic branch microstrip lines. And the wing-shaped compensation units and the microstrip line branches are arranged in a staggered manner. According to the periodic branch microstrip double-line with the wing-shaped compensation structure, the periodic microstrip line structure and the wing-shaped compensation structure are designed, capacitive coupling between the compensation lines is realized, so that far-end crosstalk is reduced, and the suppression effect is optimal by scanning and optimizing structural parameters. Compared with a traditional microstrip line, the microstrip line is lower in far-end crosstalk, small in line spacing and capable of effectively saving wiring space.

Description

Technical Field

[0001] This invention belongs to the field of radio frequency circuit technology, and in particular to a periodic stub microstrip biline with a fin-shaped compensation structure for suppressing far-end crosstalk of microstrip lines. Background Technology

[0002] In recent years, my country's radio frequency (RF) front-end industry has developed rapidly, with the signal transmission frequency of RF front-end systems continuously increasing. Simultaneously, RF terminals are developing towards miniaturization, thinner designs, and more diverse functions. This places higher demands on signal transmission in RF circuits: requiring optimized space utilization for transmission line wiring while ensuring excellent transmission quality.

[0003] Traditional suppression methods, such as adding guard lines or electromagnetic bandgap (EBG) structures, can partially alleviate crosstalk, but they suffer from problems such as increased wiring space and design complexity. For example, guard lines require shielding via grounding vias, but the via spacing requirements are strict (less than one-tenth of the wavelength), and increased width occupies more space. While EBG structures can create a bandgap to suppress interference in specific frequency bands, the design of periodic cells is complex and has limited adaptability. Therefore, an innovative structure is needed that can efficiently suppress crosstalk while minimizing space occupation. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by proposing a periodic stub microstrip biline with a wing-shaped compensation structure for suppressing far-end crosstalk in microstrip lines. The stubs of the microstrip biline compensate for capacitive coupling through wing-shaped compensation stubs, thereby suppressing far-end crosstalk. Furthermore, thanks to the staggered arrangement of the microstrip biline stubs and compensation stubs, the line spacing is reduced by 20% compared to the traditional microstrip line spacing (3 times the linewidth).

[0005] The technical solution to achieve the purpose of this invention is: a periodic stub microstrip biline with a wing-shaped compensation structure for suppressing far-end crosstalk of microstrip lines. The periodic stub microstrip biline includes: two parallel periodic stub microstrip lines, and discrete wing-shaped compensation units are uniformly distributed between the two periodic stub microstrip lines, and the wing-shaped compensation units are staggered with the microstrip line stubs.

[0006] Furthermore, the periodic branch microstrip line is composed of several periodic branch microstrip units connected end to end. Each periodic branch microstrip unit includes a main microstrip part located in the middle and branches symmetrically distributed on both sides of the main microstrip part. The structural parameters include the width of the main microstrip, the length of the branch, the width of the branch, the length of the main microstrip line on both sides of the branch, and the angle between the branch and the main microstrip.

[0007] Furthermore, a wing-shaped compensation unit is arranged between each pair of parallel periodic branch microstrip units.

[0008] Furthermore, the wing-shaped compensation unit includes two branches, which are arranged alternately with the branches in the periodic branch microstrip unit, and there is a certain relative area and distance between them; each branch in the wing-shaped compensation unit is parallel to the branch in the adjacent periodic branch microstrip unit; the structural parameters include branch width and branch length.

[0009] Furthermore, the width of the branch in the wing-shaped compensation unit is the same as the width of the branch in the periodic branch microstrip unit.

[0010] Furthermore, the spacing between the branches in the periodic branch microstrip unit and the branches in the wing-shaped compensation unit... Must meet:

[0011]

[0012] In the formula, Main microstrip width, The width of the branch in the wing-shaped compensation unit; The angle between the branch and the main microstrip in a periodic branch microstrip unit. The spacing between two parallel periodic branch microstrip lines.

[0013] Furthermore, the relative length between the branches in the periodic branch microstrip unit and the branches in the wing-shaped compensation unit is... :

[0014]

[0015] In the formula, The length of the branch in the wing-shaped compensation unit. The length of a branch in a periodic branch microstrip unit. The spacing between two parallel periodic branch microstrip lines.

[0016] Furthermore, by adjusting the structural parameters of the periodic stub microstrip unit, the return loss and insertion loss of the periodic stub microstrip twin-wire can be made to meet engineering requirements in order to achieve impedance matching with a 50-ohm RF system.

[0017] Furthermore, by adjusting the structural parameters and relative positions of the branches in the periodic branch microstrip unit and the wing-shaped compensation unit, capacitive coupling compensation is achieved, thereby suppressing far-end crosstalk.

[0018] Furthermore, the spacing between the bilinear lines of this periodic branch microstrip is smaller than that of traditional microstrip lines.

[0019] Compared with the prior art, the significant advantages of this invention are:

[0020] (1) The fin-type compensation structure does not involve metallized vias, and the structure and process are simpler.

[0021] (2) It has a better far-end crosstalk suppression effect in the 100MHz-20GHz frequency band and a wider application frequency band.

[0022] (3) Line spacing ratio The wiring rules are better, saving wiring space and helping to miniaturize RF circuits.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a periodic stub microstrip bilinear structure with a wing-shaped compensation structure used to suppress far-end crosstalk of a microstrip line in one embodiment.

[0025] Figure 2 This is a plan view of a periodic branch microstrip bilinear unit structure with a wing-shaped compensation structure in one embodiment.

[0026] Figure 3 One embodiment is an equivalent circuit diagram of a periodic stub microstrip bilinear unit with a fin-shaped compensation structure. Figure 3 (a) in the figure is the equivalent capacitance model. Figure 3 (b) in the figure is the equivalent inductance model.

[0027] Figure 4 This is a schematic diagram of a conventional parallel-coupled microstrip line used for comparison in one embodiment.

[0028] Figure 5 This is a curve showing the return loss of a traditional parallel-coupled microstrip line as a function of frequency.

[0029] Figure 6 This is a graph showing the insertion loss of a traditional parallel-coupled microstrip line as a function of frequency.

[0030] Figure 7 This is a curve showing the far-end crosstalk of a traditional parallel-coupled microstrip line as a function of frequency.

[0031] Figure 8 One embodiment , , Curve of far-end crosstalk versus frequency.

[0032] Figure 9 One embodiment , , , Curve of far-end crosstalk versus frequency.

[0033] Figure 10 One embodiment , , Curve of far-end crosstalk versus frequency.

[0034] Figure 11 One embodiment , , Curve of far-end crosstalk versus frequency.

[0035] Figure 12 One embodiment , , Curve of far-end crosstalk versus frequency.

[0036] Figure 13 One embodiment , , A comparison of the return loss curves with frequency of traditional parallel-coupled microstrip lines.

[0037] Figure 14 One embodiment , , A comparison of the insertion loss curves of traditional parallel-coupled microstrip lines with frequency.

[0038] Figure 15 One embodiment , , A comparison of the far-end crosstalk curves with frequency of traditional parallel-coupled microstrip lines.

[0039] Figure 16 One embodiment , , A comparison of the near-end crosstalk curves of traditional parallel-coupled microstrip lines with frequency. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0041] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0042] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0043] In one embodiment, a periodic stub microstrip biline with a wing-shaped compensation structure is provided for suppressing far-end crosstalk of a microstrip line. The periodic stub microstrip biline includes two parallel periodic stub microstrip lines, and discrete wing-shaped compensation units are uniformly distributed between the two periodic stub microstrip lines, with the wing-shaped compensation units and microstrip line stubs arranged alternately.

[0044] This periodic stub microstrip biwire structure consists of an upper conductor, a middle dielectric substrate, and a lower grounding metal plate. The upper conductor, made of copper, includes the periodic stub microstrip biwire for signal transmission and a finned compensation structure for suppressing far-end crosstalk. The choice of the middle dielectric substrate affects the impedance matching and coupling of the structure. The lower grounding metal plate is also made of copper.

[0045] Furthermore, in one embodiment, the periodic stub microstrip line is composed of several periodic stub microstrip units connected end-to-end. Each periodic stub microstrip unit includes a main microstrip portion located in the middle and stubs symmetrically distributed on both sides of the main microstrip portion. The structural parameters include the main microstrip width, stub length, stub width, the length of the main microstrip line on both sides of the stub, and the angle between the stub and the main microstrip. The values ​​of the structural parameters must ensure impedance matching of the transmission line.

[0046] Preferably, in some embodiments, a wing-shaped compensation unit is arranged between each pair of parallel periodic branch microstrip units.

[0047] Here, periodic stub microstrip lines are applied... The ohmic characteristic impedance system, through electromagnetic simulation software, was determined to meet engineering requirements regarding its return loss and insertion loss: Return loss Insertion loss .

[0048] Furthermore, in one embodiment, the wing-shaped compensation unit includes two branches, which are staggered with the branches in the periodic branch microstrip unit, and have a certain relative area and distance between them; each branch in the wing-shaped compensation unit is parallel to the branch in the adjacent periodic branch microstrip unit; the structural parameters include branch width and branch length.

[0049] Preferably, in some embodiments, the width of the branch in the wing-shaped compensation unit is the same as the width of the branch in the periodic branch microstrip unit.

[0050] Preferably, in some embodiments, the spacing between the branches in the periodic branch microstrip unit and the branches in the wing-shaped compensation unit is... Must meet:

[0051]

[0052] In the formula, Main microstrip width, The width of the branch in the wing-shaped compensation unit; The angle between the branch and the main microstrip in a periodic branch microstrip unit. The spacing between two parallel periodic branch microstrip lines.

[0053] here, The size of the branch affects the strength of the coupling between branches.

[0054] Preferably, in some embodiments, the relative length between the branches in the periodic branch microstrip unit and the branches in the wing-shaped compensation unit is: :

[0055]

[0056] In the formula, The length of the branch in the wing-shaped compensation unit. The length of a branch in a periodic branch microstrip unit. The spacing between two parallel periodic branch microstrip lines.

[0057] here, The length of the branches affects the coupling area between them.

[0058] Preferably, in some embodiments, the return loss and insertion loss of the periodic stub microstrip unit are adjusted to meet engineering requirements to achieve impedance matching with a 50-ohm RF system.

[0059] By adjusting the structural parameters and relative positions of the branches in the periodic branch microstrip unit and the wing-shaped compensation unit, capacitive coupling compensation is achieved, thereby suppressing far-end crosstalk.

[0060] Here, the far-end crosstalk between the periodic stub microstrip twins is proportional to the difference between capacitive and inductive coupling, and the fin-shaped compensation structure supplements the coupling path for the periodic stub microstrip twins. By adjusting... , , and The values ​​of structural parameters change the capacitance and inductance between microstrip twins, thus affecting the difference between capacitive and inductive coupling. Adjusting the structural parameters equalizes capacitive and inductive crosstalk, thereby suppressing far-end crosstalk.

[0061] Preferably, in some embodiments, the spacing between the bilinear lines of the periodic stub microstrip is smaller than the spacing between conventional microstrip lines.

[0062] Specifically, in combination Figure 3 The introduction of the fin-shaped compensation structure in this invention alters the capacitive and inductive coupling between the bilinear lines of the periodic branched microstrip. The mutual capacitance and mutual inductance between the lines can then be expressed by the following two formulas. Clearly, the mutual capacitance of the bilinear lines increases compared to the absence of the fin-shaped compensation structure, while the mutual inductance decreases.

[0063]

[0064]

[0065] As a four-port network, the periodic stub microstrip biwire with fin-shaped compensation structure can be obtained with ports 2 and 3 short-circuited. It can be obtained when ports 2 and 3 are open. . and Port impedance ohm.

[0066]

[0067]

[0068] Furthermore, electromagnetic simulation software was used to simulate and solve the crosstalk values ​​between two lines with different structural parameters, and the structural parameter values ​​with excellent far-end crosstalk suppression effect were determined.

[0069] The suppression capability of the periodic stub microstrip biwire with finned compensation structure for far-end crosstalk is achieved by using traditional parallel microstrip biwires of the same material, thickness, and length at a spacing of [missing information]. The far-end crosstalk value at that time is used as a reference.

[0070] As a specific example, the invention will be further verified and illustrated in one embodiment.

[0071] Reference Figure 1 and Figure 2 This embodiment discloses a periodic stub microstrip biline with a fin-shaped compensation structure for suppressing far-end crosstalk of microstrip lines, specifically as follows: it includes a periodic stub microstrip biline for signal transmission and a fin-shaped structure for compensating for inter-line capacitive coupling.

[0072] The specific structural parameters of the periodic branched microstrip bilinear structure with wing-shaped compensation structure are: main microstrip width... Line spacing Branch width Length of the main microbelt on both sides of the branch The upper conductor is made of copper, and its thickness is... for The middle layer dielectric material is Rogers RO4003, with a dielectric constant of [insert value here]. The loss factor is ,thickness choose Initial value of the length of the periodic branch microstrip line branch. Initial value of the angle between the branch and the main microband Initial value of winged branch length .

[0073] To evaluate the far-end crosstalk consistency effect of the structure proposed in this invention, a set of conventional parallel-coupled microstrip lines was set up as a comparison, such as... Figure 4 As shown.

[0074] For fair comparison, the dielectric substrate used in the traditional microstrip line should be the same as that used in the structure proposed in this invention, namely Rogers RO4003, with the same substrate thickness. Using the commonly used impedance calculation software PolarSi9000, the impedance of the copper microstrip line was calculated. ,width The characteristic impedance is 50Ω. The line spacing is set to... .

[0075] Figures 5 to 7 The return loss, insertion loss, and far-end crosstalk curves of a conventional parallel-coupled microstrip line as a function of frequency, obtained from HFSS simulation, are presented.

[0076] To obtain the structural parameters with optimal far-end crosstalk suppression effect, the stub lengths of periodic stub microstrip lines were analyzed. Angle between branches and main microband and wing-shaped branch length The impact of changes on far-end crosstalk. First, The length is set to ,scanning The length. Initial value set to ,by For spacing, the final value is set to . Figure 8 The simulation results for crosstalk are displayed. The simulation shows that, as... With increasing length, near-end crosstalk increases, while far-end crosstalk initially decreases and then increases. When the length of the wing-shaped branch increases, its distance from the main microstrip line of the transmission lines on both sides becomes closer, making it easier for the interference signal of the attacking line to couple to the victim line through the protection unit.

[0077] Furthermore, on A more detailed scan was performed to find the wing branch length that minimizes far-end crosstalk under the current parameter values. Simulation analysis. The far-end crosstalk value at that time, from Figure 9 As can be seen from this, in the frequency range of 100MHz-20GHz, when At this time, the far-end crosstalk is minimized.

[0078] Furthermore, let Scan analysis Analysis The same approach applies when things change; first... The step size of the change is set to , Still for The simulation results are as follows: Figure 10 As can be seen, similar to analysis The situation at that time, with With increasing length, near-end crosstalk increases, while far-end crosstalk... The minimum time, in hour, The closer , The smaller the value, the better. hour, The further away , The larger the value, the better.

[0079] Furthermore, on Perform more detailed scanning analysis. Simulation analysis. The far-end crosstalk value at that time. From Figure 11 It can be seen from this that, although and At lower frequencies, the far-end crosstalk is lower because capacitive coupling is stronger at higher frequencies for the same parameter structure. However, from the frequency range of 100MHz-20GHz, It is a better parameter choice.

[0080] Furthermore, from an analytical perspective The impact of changes on far-end crosstalk. (From equation...) Japanese style Know, Increase and All of these will increase accordingly. and It will increase, therefore according to the formula achievable It will also increase. So the angle Larger changes will lead to an increase in the capacitive coupling ratio, because, similarly, according to equation... Mutual induction is known It will decrease. From the perspective of... and The scanning analysis can determine the angle. There should exist an optimal value for capacitive coupling compensation. Figure 12 The simulation results confirm the aforementioned analysis. from Gradually increase to At that time, the far-end crosstalk value also gradually decreased. Continue from Gradually increase to At that time, the remote crosstalk gradually worsened. Ultimately, it was... .

[0081] Figure 13 and Figure 14 This paper compares the return loss and insertion loss of an embodiment of the present invention with those of a conventional parallel-coupled microstrip line. It can be seen that at high frequencies, the insertion loss of the embodiment of the present invention is superior to that of the conventional coupled microstrip line. The return loss meets engineering requirements within the 100MHz-20GHz frequency range. Requirements.

[0082] Figure 15 This is a comparison of the far-end crosstalk curves of the embodiment of the present invention and those of a traditional parallel-coupled microstrip line with frequency. It can be seen that the embodiment of the present invention achieves good crosstalk suppression in the 100MHz-20GHz frequency range, and at high frequencies... The far-end crosstalk value at that time Superior to traditional parallel-coupled microstrip lines .

[0083] Figure 16 This is a comparison of the near-end crosstalk (NUC) curves of the embodiment of the present invention with those of a conventional parallel-coupled microstrip line as a function of frequency. It can be seen that the near-end crosstalk value of the embodiment of the present invention is lower than that of conventional parallel-coupled microstrip lines in the 100MHz-20GHz frequency range. The significant reduction in far-end crosstalk did not lead to a significant deterioration in near-end crosstalk.

[0084] In summary, the periodic stub microstrip bilinear line with fin-shaped compensation structure proposed in this invention reduces far-end crosstalk by compensating for capacitive coupling between lines through the design of the periodic microstrip line structure and the fin-shaped compensation structure. Furthermore, by optimizing the structural parameters through scanning, the suppression effect is maximized. Compared with traditional microstrip lines, this invention exhibits lower far-end crosstalk, smaller line spacing, and effectively saves wiring space.

[0085] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention without departing from its spirit and scope should be included within the protection scope of the present invention.

Claims

1. A periodic stub microstrip bilinear wire with a finned compensation structure for suppressing far-end crosstalk in microstrip lines, characterized in that, The periodic branch microstrip double line includes: two parallel periodic branch microstrip lines, with discrete wing-shaped compensation units evenly distributed between the two periodic branch microstrip lines, and the wing-shaped compensation units are staggered with the microstrip line branches.

2. The periodic stub microstrip bilinear line with finned compensation structure for suppressing far-end crosstalk of microstrip lines according to claim 1, characterized in that, The periodic branch microstrip line is composed of several periodic branch microstrip units connected end to end. Each periodic branch microstrip unit includes a main microstrip part located in the middle and branches symmetrically distributed on both sides of the main microstrip part. The structural parameters include the width of the main microstrip, the length of the branch, the width of the branch, the length of the main microstrip line on both sides of the branch, and the angle between the branch and the main microstrip.

3. The periodic stub microstrip bilinear line with finned compensation structure for suppressing far-end crosstalk of microstrip lines according to claim 2, characterized in that, Between each pair of parallel periodic branch microstrip units, a wing-shaped compensation unit is arranged.

4. The periodic stub microstrip bilinear line with finned compensation structure for suppressing far-end crosstalk of microstrip lines according to claim 2, characterized in that, The wing-shaped compensation unit includes two branches, which are arranged alternately with the branches in the periodic branch microstrip unit, and there is a certain relative area and distance between them; each branch in the wing-shaped compensation unit is parallel to the branch in the adjacent periodic branch microstrip unit; the structural parameters include branch width and branch length.

5. The periodic stub microstrip bilinear line with finned compensation structure for suppressing far-end crosstalk of microstrip lines according to claim 4, characterized in that, The width of the branch in the wing-shaped compensation unit is the same as the width of the branch in the periodic branch microstrip unit.

6. The periodic stub microstrip bilinear line with finned compensation structure for suppressing far-end crosstalk of microstrip lines according to claim 5, characterized in that, The spacing between the branches in the periodic branch microstrip unit and the branches in the wing-shaped compensation unit Must meet: In the formula, Main microstrip width, The width of the branch in the wing-shaped compensation unit; denoted as , where is the angle between the branch and the main microstrip in a periodic branch microstrip unit, and s is the distance between two parallel periodic branch microstrip lines.

7. The periodic stub microstrip bilinear line with finned compensation structure for suppressing far-end crosstalk of microstrip lines according to claim 5, characterized in that, The relative length between the branches in the periodic branch microstrip unit and the branches in the wing-shaped compensation unit is : In the formula, The length of the branch in the wing-shaped compensation unit. denoted as s, where s is the length of a branch in a periodic branch microstrip unit, and s is the spacing between two parallel periodic branch microstrip lines.

8. The periodic stub microstrip bilinear line with finned compensation structure for suppressing far-end crosstalk of microstrip lines according to claim 2, characterized in that, By adjusting the structural parameters of the periodic stub microstrip unit, the return loss and insertion loss of the periodic stub microstrip twin-wire can meet engineering requirements to achieve impedance matching with a 50-ohm RF system.

9. The periodic stub microstrip bilinear line with finned compensation structure for suppressing far-end crosstalk of microstrip lines according to claim 4, characterized in that, By adjusting the structural parameters and relative positions of the branches in the periodic branch microstrip unit and the wing-shaped compensation unit, capacitive coupling compensation is achieved, thereby suppressing far-end crosstalk.

10. The periodic stub microstrip bilinear line with finned compensation structure for suppressing far-end crosstalk of microstrip lines according to claim 4, characterized in that, The spacing between the bilinear lines of the periodic branch microstrip is smaller than that of the traditional microstrip lines.

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