CN203721865U

CN203721865U - Differential pair microstrip line with low crosstalk and high-frequency transmission

Info

Publication number: CN203721865U
Application number: CN201420076812.XU
Authority: CN
Inventors: 吴家和
Original assignee: Individual
Current assignee: Wu Jiahe
Priority date: 2014-02-14
Filing date: 2014-02-21
Publication date: 2014-07-16
Anticipated expiration: 2024-02-21
Also published as: TWM483552U

Abstract

The utility model provides a differential pair microstrip line with low crosstalk and high frequency transmission, which comprises a first microstrip line, a second microstrip line and a third microstrip line, wherein the first microstrip line is used for transmitting a first transmission signal and is provided with a plurality of grooves which are arranged periodically; the second microstrip line is parallel to the first microstrip line and is used for transmitting a second transmission signal, the second transmission signal and the first transmission signal are complementary signals with the phase difference of 180 degrees, and the second microstrip line is provided with a plurality of grooves which are periodically arranged; the grooves are periodically arranged on the outer side of the first microstrip line and the outer side of the second microstrip line in a sub-wavelength mode, the sub-wavelength mode is that the periodic arrangement length of the grooves is smaller than the wavelength of the transmitted first transmission signal and the second transmission signal, and the grooves provide sub-wavelength constraint for enhancing the electromagnetic wave.

Description

The differential pair microstrip line of the low high-frequency transmission of crosstalking

Technical field

The utility model relates to a kind of transmission line, particularly a kind of differential pair microstrip line of the low high-frequency transmission of crosstalking.

Background technology

In recent years, in digital system, along with the lifting of signal transfer rate and the overall dimensions of electronics more and more little, the setting of electronic circuit is also more and more intensive, therefore, the phenomenon of crosstalking between circuit is also more and more serious.So-called crosstalking (crosstalk) results from signal when transmission channel, because electromagnetic coupled exerts an influence to adjoining transmission line, and produces online coupled voltages and couple current in disturbed transmission.The excessive efficiency that will have influence on System Operation of crosstalking, very causes and causes circuit false triggering, and then system cannot normally be worked.In addition,, in mainboard or high speed circuit, if when encountering electronic circuit and need turn according to actual design, often to increase the interval between microstrip line or to increase the digital signal rise and fall time, suppress to crosstalk, but still cannot effectively solve cross-interference issue.

In view of traditional method there is no the cross-interference issue between effective solution circuit, therefore need the differential pair microstrip line construction of the low high-frequency transmission of crosstalking that proposes a kind of novelty badly, can be used for suppressing the generation of crosstalking and reduce the transition effects that differential mode turns common mode.

Utility model content

The utility model is mainly the microstrip line that utilizes signal transmission, and while there is signal, its surface current is mainly distributed in the edge of microstrip line, i.e. the high current density of the marginal existence of conduction band.If the etching edge sub-wavelength cycle ripple at microstrip line, edge current is introduced to groove and form approximate closed-loop path, be conducive to promote the self-induction of circuit itself, and by magnetically confined near self wire, effectively reduce proximate circuitry due to crosstalking that mutual inductance causes.Along with the structure of inside grooves will have different binding effects from the different of the degree of depth to magnetic field.

To have the object of periodic structure be for bandreject filtering to microstrip circuit in the prior art, but often in actual circuit, seldom use because structure is long.In addition, in prior art, another purposes of periodic structure is to be used to form suitable R-L framework, for the coupling as with adjacent circuit.Therefore concept of the present utility model and above-mentioned two kinds of viewpoints of the prior art are distinguished to some extent.Be engaged in these two kinds of inveteracy ideas based on to periodic structure of this class work, make professional staff expect the transmission main body of utilizing periodic structure to do signal be have suitable difficult, in addition the circuit design software using due to professional is not supported the circuit of this class, for make holding wire of periodic line, cannot imagine.The way that is most commonly used at present suppress to crosstalk has two kinds, and the first is to utilize the repeatedly turning of differential lines or single ended line to reduce to crosstalk, and this will cause the increase of common-mode signal for differential pair, is unfavorable for the running of wire integrated circuit.The second way is to add earth connection between contiguous loop, and this can cause two obvious defects.The area in first loop just cannot effectively dwindle, and it two is that earth connection only intercepts electric field, and the effect suppressing for the mutual inductance between line is little.The utility model is used in conductive surface and portrays roundabout path, makes edge current in such circuitous path, form a quasi loop operative constraint is done in magnetic field, and what inhibition mutual inductance caused crosstalks.Such constraint is for effect that signal of high frequency has had.Because Cycle Length is much smaller than wavelength, therefore, its operating frequency is away from band gap, and main function is signal transmission but not reflected signal, with filter be not the application under same concept.Applicable field is high-frequency microwave circuit and high speed circuit, special in intensive circuit, the effectively phase mutual interference between isolation signals line.Differential pair mainly transmits complementary signal, different from single-ended transmission line, and it has stronger antijamming capability, but in the use, uses the holding wire quantity many holding wire more required than single-ended transmission line on loop, and circuit area just relatively can be larger.In order to reduce the area of circuit, to cause differential pair will and other transmission lines between excessively close, crosstalk and change with differential signal very serious that the situation of common-mode signal becomes into, be necessary to depart from and use traditional difference microstrip line, with the transmission line of novel concept, substitute.In the transmission of signal, differential pair is to consist of two transmission lines, two all numbers of delivering a letter, but 180 ° of the phase phasic differences of the signal of two lines, and this is the difference great with of single-ended transmission line.

An object of the present utility model is to provide a kind of differential pair microstrip line of the low high-frequency transmission of crosstalking, and it comprises: one first microstrip line, and it is for transmitting one first signal transmission, and this first microstrip line has a plurality of grooves of periodic arrangement; And one second microstrip line, it is parallel to this first microstrip line, and in order to transmit one second signal transmission, this second signal transmission and this first signal transmission are that phase difference is the complementary signal of 180 °, and this second microstrip line has a plurality of grooves of periodic arrangement; Wherein, the plurality of groove is in the mode of sub-wavelength, be arranged in periodically the outside of this first microstrip line and the outside of this second microstrip line, the mode of this sub-wavelength is the arrangement Cycle Length of the plurality of groove, be less than this first signal transmission of transmission and the wavelength of this second signal transmission, the plurality of groove provides and strengthens electromagnetic sub-wavelength constraint.

Another object of the present utility model is that it more contains: one first port, and it is the port of this first microstrip line and this second microstrip line input complementary signal; And one second port, it is the port of this first microstrip line and this second microstrip line output complementary signal; A plurality of these grooves of wherein arranging along microstrip line edge, for when by this first end port transmission complementary signal during to this second port, reduction differential mode turns the transition effects of common mode.Wherein, a plurality of these grooves, it is for when, being reduced and an adjoining single microstrip line or the energy crosstalk effect of a differential pair during to this second port by this first end port transmission complementary signal.

Wherein, the plurality of groove, the arrangement mode with sub-wavelength, more includes: be symmetrical in a plurality of these grooves in the outside of this first microstrip line, and be arranged in periodically the inner side of this first microstrip line; And a plurality of these grooves that are symmetrical in the outside of this second microstrip line, and be arranged in periodically the inner side of this second microstrip line.

The effect that the utility model reaches is to provide a kind of differential pair microstrip line construction of the low high-frequency transmission of crosstalking, and in order to solve the problem of crosstalking with common mode transition effects in high speed circuit, and promotes signal transmission quality and dwindles circuit board size.

Another effect that the utility model reaches is to provide a kind of differential pair microstrip line construction of the low high-frequency transmission of crosstalking, the periodicity groove with sub-wavelength dimensions, and the shape of groove is done corresponding adjustment with large I according to actual design, and then with the electromagnetic energy height of formation constraint online to the micro-band of groove of the pattern of artificial surface electricity slurry polaron.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of sub-wavelength periodic structure outer openings groove type differential pair;

Fig. 2 is the schematic diagram of the coupling circuit of sub-wavelength periodic structure outer openings groove type differential pair and traditional differential pair;

Fig. 3 is the transmittability S of signal in outer openings groove type differential pair _dd21and the S that crosstalks of differential pair and adjacent traditional differential pair _dd41schematic diagram;

Fig. 4 is the conversion effect S of differential-mode signal and common-mode signal in outer openings groove type differential pair _cd21schematic diagram;

Fig. 5 is the schematic diagram of hairpin-type differential pair integral body outside sub-wavelength periodic structure;

Fig. 6 is the schematic diagram of hairpin-type differential pair details outside sub-wavelength periodic structure;

Fig. 7 is the schematic diagram of the coupling circuit of hairpin-type differential pair and traditional differential pair outside sub-wavelength periodic structure;

Fig. 8 is the transmittability S of signal in the hairpin-type differential pair of outside _dd21and the S that crosstalks of differential pair and adjacent traditional differential pair _dd41schematic diagram;

Fig. 9 is the conversion effect S of differential-mode signal and common-mode signal in the hairpin-type differential pair of outside _cd21schematic diagram;

Figure 10 is the schematic diagram of sub-wavelength periodic structure outer concave slot type differential pair;

Figure 11 is the schematic diagram of the coupling circuit of sub-wavelength periodic structure outer concave slot type differential pair and traditional differential pair;

Figure 12 is the transmittability S of signal in outer concave slot type differential pair _dd21and the S that crosstalks of differential pair and adjacent traditional differential pair _dd41schematic diagram;

Figure 13 is the conversion effect S of differential-mode signal and common-mode signal in outer concave slot type differential pair _cd21schematic diagram;

Figure 14 is the schematic diagram of sub-wavelength periodic structure double-side opening stomatodeum slot type differential pair;

Figure 15 is the schematic diagram of the coupling circuit of sub-wavelength periodic structure double-side opening stomatodeum slot type differential pair and traditional differential pair;

Figure 16 is the transmittability S of signal in double-side opening stomatodeum slot type differential pair _dd21and the S that crosstalks of differential pair and adjacent traditional differential pair _dd41schematic diagram;

Figure 17 is the conversion effect S of differential-mode signal and common-mode signal in double-side opening stomatodeum slot type differential pair _cd21schematic diagram;

Figure 18 is the schematic diagram of sub-wavelength periodic structure bilateral groove type differential pair;

Figure 19 is the schematic diagram of sub-wavelength periodic structure bilateral groove type differential pair and single ended microstrip coupling circuit;

Figure 20 is the transmittability S of signal in sub-wavelength cycle bilateral groove type differential pair _dd21and the S that crosstalks of differential pair and adjacent single ended microstrip _sd41schematic diagram.

Figure 21 is the conversion effect S of differential-mode signal and common-mode signal in sub-wavelength cycle bilateral groove type differential pair _cd21schematic diagram;

Figure 22 is the schematic diagram of sub-wavelength periodic structure bilateral hairpin-type differential pair integral body;

Figure 23 is the schematic diagram of sub-wavelength periodic structure bilateral hairpin-type differential pair details;

Figure 24 is the schematic diagram of sub-wavelength periodic structure bilateral hairpin-type differential pair and single ended microstrip coupling circuit;

Figure 25 is the transmittability S of cycle bilateral hairpin-type differential pair signal _dd21and the S that crosstalks of differential pair and adjacent single ended microstrip _sd41schematic diagram;

Figure 26 is the conversion effect S of differential-mode signal and common-mode signal in cycle bilateral hairpin-type differential pair _cd21schematic diagram.

Description of reference numerals: 11-the first microstrip line; 12-the second microstrip line; 13-the first port; 14-the second port; 15-rectangle concave volume; 16-rectangle convex body; 17-the first extension; 18-the second extension; 20-Z type convex body; 21-substrate; 22-the 3rd port; 23-the 4th port; A, b, d, h, w, w1-size; ε _r-dielectric constant.

Embodiment

The utility model provides the 1st embodiment outer openings groove type differential pair, as shown in Figure 1, article two, sub-wavelength cycle microstrip line forms a differential pair, signal is by the first port 13 inputs, by the second port one 4 outputs, wherein a bars is the signal that the first microstrip line 11 is sent into, another is that the second microstrip line 12 signal phase difference of sending into the first microstrip line 11 that send into is the signal (being two complementary signal) of 180 °, the structure of the plurality of groove in the structure of outer openings groove type differential pair, it is a rectangle concave volume 15, the structure that is consecutive periods in conjunction with a rectangle convex body 16, and in the opening part of each groove, one this rectangle convex body 16 has two the first extensions 17 that extend in parallel to these groove central authorities.

The width of microstrip line is w, and the interval of two microstrip lines is w ₁, the thickness of the metal of two microstrip lines is t, and the thickness of substrate 21 is h, and the Cycle Length of cycle microstrip line is d, and the groove depth of cycle microstrip line is b, the dielectric constant of substrate 21 media is ε _r, when single ended microstrip or another group differential pair appear in the side of the smooth unnotched differential pair of this tradition, there are two obvious effects, first effect is will to occur that obvious differential mode turns the effect of common mode by the first port 13 to second port ones 4.Second effect is will be crosstalked at contiguous another microstrip line or differential pair generation by the complementary signal of the first port 13 inputs, for prove that this sub-wavelength cycle differential pair can suppress and adjacent microstrip line between crosstalk, and can effectively reduce the differential mode transition effects of intermode together, can consider to carry out numerical analysis with the coupled circuit configuration of Fig. 2.

As shown in Figure 2, (width of microstrip line is w separately for the differential pair being comprised of one group of sub-wavelength cycle open recess, the first microstrip line 11 and the second microstrip line 12 and another traditional differential pair ₄) coupling circuit that forms.Differential signal, by the first port 13 inputs, is analyzed the output of the second port one 4, can understand the transmittability of differential pair.By the first port 13 inputs, analyze the output of the 4th port 23, can understand crosstalking between differential pair and contiguous traditional differential pair.The interval of first group of differential pair and second group of differential pair microstrip line is w ₂, differential pair signal is entered by the first port 13, and by S parameter, (S parameter is the scattering parameter of coupling circuit to the transmittability of being exported by the second port one 4, for assessment of the performance of equipment under test reflected signal and transmission signal.) represent it is S _dd21, differential pair signal is entered by the first port 13, and the crosstalk effect of being exported by the 4th port 23 of traditional differential pair is S by S Parametric Representation _dd41, differential pair signal is entered by the first port 13.The effect that the differential mode of being exported by the second port one 4 turns common mode is S by S Parametric Representation _cd21wherein the transmission of the whole two groups of smooth differential pairs of tradition (conventional) represents with solid line with the effect of crosstalking, and one group of the present embodiment is sub-wavelength periodic structure differential pair, transmission that another group is traditional differential pair dots with the effect of crosstalking.As shown in Figure 3 and 4, the parameter of simulation: w=w ₁=w ₂=w ₃=w ₄=1.2mm, the total length of microstrip line is 10cm, substrate 21 use frequency P CB sheet material RO4003 materials, thickness of metal film t=0.0175mm, thickness of slab h=0.508mm, groove depth b=0.6w, Cycle Length d=1.0mm, the frequency range of analysis by 200MHz to 12GHz.In Fig. 2, the first two, 13 place of port microstrip line is inputted complementary differential signal; The receiving terminal that the second port one 4 is differential pair, the 3rd port 22 represent the near-end of traditional differential pair, the far-end that the 4th port 23 represents traditional differential pair, the wherein S of Fig. 3 _dd21the signal transmission capabilities that represents differential pair, S _dd41represent crosstalking of differential pair and adjacent another differential pair, wherein the S of Fig. 4 _cd21the conversion effect that represents differential-mode signal and common-mode signal.

The result that the 1st two groups of embodiment are traditional differential pair is as shown in the solid line of Fig. 3, Fig. 4.As shown in Figure 3, traditional differential pair signal enters transmittability by the second port one 4 output by S Parametric Representation: S by the first port 13 _dd21. S under the frequency of 200MHz _dd21=-0.08821dB, S under frequency 12GHz _dd21=-2.32492dB.As shown in Figure 3, traditional differential pair signal enters crosstalk effect by the 4th port 23 output of traditional differential pair by S Parametric Representation: S by the first port 13 _dd41, S under 200MHz frequency _dd41=-48.55245dB, S under 12GHz frequency _dd41=-9.38157dB.As shown in Figure 4, differential pair signal enters effect that the differential mode by the second port one 4 output turns common mode by S Parametric Representation: S by the first port 13 _cd21, at 12GHzS _cd21=-12.37439dB.

The 1st mono-group of embodiment is sub-wavelength cycle outer openings groove type differential pair and another group is the result of traditional differential pair, as shown in the dotted line of Fig. 3, Fig. 4.As shown in Figure 3, differential pair signal enters transmittability by the second port one 4 output by S Parametric Representation: S by the first port 13 _dd21, S under the frequency of 200MHz _dd21=-0.07573dB, S under frequency 12GHz _dd21=-1.21404dB.As shown in Figure 3, differential pair signal enters crosstalk effect by the 4th port 23 output of traditional differential pair by S Parametric Representation: S by the first port 13 _dd41, S under 200MHz frequency _dd41=-60.6408dB, S under 12GHz frequency _dd41=-29.62501dB, and frequency 1GHz is S under 5.1GHz to the maximum of crosstalking in 10GHz interval _dd41=-34.538dB.As shown in Figure 4, differential pair signal enters effect that the differential mode by the second port one 4 output turns common mode by S Parametric Representation: S by the first port 13 _cd21, S under 12GHz frequency _cd21=-27.66008dB.

The comprehensive comparison of the 1st embodiment outer openings groove type differential pair and traditional differential pair as shown in Figure 3, Figure 4.As shown in Figure 3, traditional differential pair S under 12GHz frequency _dd21=-2.32492dB, sub-wavelength cycle differential pair S _dd21=-1.21404dB, transmittability has significant lifting in the situation that of high-frequency signal.As shown in Figure 3, the S that crosstalks between two sections of traditional differential pairs under 12GHz frequency _dd41=-9.38157dB, sub-wavelength cycle differential pair S _dd41=-29.62501dB, crosstalks and obtains and suppress significantly.As shown in Figure 4, S when the traditional differential pair differential mode of 12GHz frequency turns the effect 12GHz frequency of common mode _cd21=-12.37439dB, sub-wavelength cycle differential pair S _cd21=-27.66008dB, differential mode turns common-mode effect and obtains inhibition.Aid illustration: Fig. 3 is the S calculation of parameter result of Fig. 2 coupling circuit.Consider the numerical result of figure tri-, the S of traditional differential pair _dd21with solid line, represent, under 200MHz frequency, be-0.08821dB, under 12GHz frequency, be-2.32492dB.The S of sub-wavelength cycle outer openings groove type differential pair _dd21dot, be-0.07573dB under 200MHz frequency, be-1.21404dB under 12GHz frequency, obviously the transmittability of sub-wavelength periodic structure is better, for electromagnetic field, has good constraint.Due to this, to the strong constraint of electromagnetic field, sub-wavelength cycle outer openings groove type differential pair obviously will have lower interference for contiguous microstrip line.Along with the increase of frequency, crosstalk more and more obviously, when 12GHz frequency, tradition differential configuration is for the S that crosstalks of another traditional differential pair _dd41for-9.38157dB, and the S that crosstalks of sub-wavelength cycle outer openings groove type differential pair and traditional differential pair _dd41be only-29.62501dB that sub-wavelength cycle outer openings groove type differential pair has obvious anti-crosstalk effect.Fig. 4 is that in coupling circuit, differential mode turns common mode with the result of variations of frequency.Along with the rising of frequency, the effect that differential mode turns common mode is all the more obvious.Yet if differential pair is carved with sub-wavelength cycle outer openings groove type ripple, can effectively suppress the effect of conversion.The effect that the differential mode of tradition differential pair turns common-mode signal is S under 12GHz frequency _cd21=-12.37439dB, the differential mode of sub-wavelength cycle outer openings groove type differential pair turns the effect of common-mode signal and only has S _cd21=-27.66008dB, obviously exists sub-wavelength periodic structure can effectively suppress the conversion efficiency of differential mode to common mode.

The utility model provides the 2nd embodiment: sub-wavelength is hair clip differential pair outside the cycle, as shown in Figure 5, article two, sub-wavelength cycle microstrip line forms a differential pair, signal is by the first port 13 inputs, by the second port one 4 outputs, wherein a bars is the signal that the first microstrip line 11 is sent into, another is that to send into the signal phase difference of sending into the first microstrip line 11 be the signal (being two complementary signal) of 180 ° for the second microstrip line 12 of same differential pair, outside hair clip differential pair structure is the structure that a plurality of Z-type convex bodys 20 are consecutive periods, the plurality of Z-type convex body 20, there is one first extension 17, it is in the opening part of each this groove, to these groove central authorities, extend in parallel, and one second extension 18, it,, in each these Z-type convex body 20 middle section, extends in parallel to these groove central authorities, wherein, this first extension 17 is contrary with the bearing of trend of this second extension 18.

The width of microstrip line: w, the interval of two microstrip lines: w ₁, the thickness of metal: t, the thickness of substrate 21 is: h, the Cycle Length of cycle microstrip line: d, the groove depth of cycle microstrip line: b, the dielectric constant of substrate 21 media: ε _r, other structural parameters a ₁, a ₂(width of outward opening groove), a ₃(width of inner opening groove), b ₁(width of metal slice), b ₂(interval of metal slice).When there is single ended microstrip or another group differential pair in the side of the differential pair of this tradition (smooth), there are two obvious effects, first effect is by the first port 13 to second port ones 4, will the obvious differential mode of appearance to be turned the effect of common mode.Second effect is will be at another microstrip line or differential pair generation crosstalk effect by the complementary signal of the first port 13 inputs.For prove that this sub-wavelength cycle differential pair can suppress and adjacent microstrip line between crosstalk, and can effectively reduce the differential mode transition effects of intermode together, can consider the coupled circuit configuration of Fig. 7 to carry out numerical analysis.Fig. 7 is the coupling circuit that one group of sub-wavelength cycle hairpin-type differential pair and traditional differential pair form.Differential signal, by the first port 13 inputs, is analyzed the output of the second port one 4, can understand the transmittability of differential pair.By the first port 13 inputs.The output of analyzing the 4th port 23 can understand differential pair and traditional differential pair between crosstalk.The marginating compartment of two groups of differential pairs: w ₂, differential pair signal is entered by the first port 13, and the transmittability of being exported by the second port one 4 is by S Parametric Representation: S _dd21, differential pair signal enters crosstalk effect by the 4th port 23 output of traditional differential pair by S Parametric Representation: S by the first port 13 _dd41, differential pair signal enters effect that the differential mode by the second port one 4 output turns common mode by S Parametric Representation: S by the first port 13 _cd21, wherein tradition (conventional) be all that transmission between smooth differential pair represents with solid line with the effect of crosstalking, the transmission of sub-wavelength periodic structure differential pair and the effect of crosstalking dot.The parameter of simulation: w=w ₁=w ₂=w ₃=w ₄=1.2mm, the total length of microstrip line is 10cm, substrate 21 use frequency P CB sheet material RO4003 materials, thickness of metal film t=0.0175mm, thickness of slab h=0.508mm, groove depth b=0.6w, Cycle Length d=1.0mm, the frequency range of analysis by 200MHz to 12GHz.In Fig. 7, at the differential signal of two micro-tape input complementations of the first port 13, the receiving terminal that the second port one 4 is differential pair, the 3rd port 22 is near-ends of traditional differential pair, the 4th port 23 represents the far-end of traditional differential pair.In Fig. 8, the parameter of simulation: w=w ₁=w ₂=w ₃=w ₄=1.2mm, the total length of microstrip line is 10cm, the material of substrate 21 use RO4003, thickness of metal film t=0.0175mm, thickness of slab h=0.508mm, groove depth b=0.6w,, Cycle Length d=1.0mm, the scope of analysis by 200MHz to 12GHz, S _dd21the transmittability that represents signal, S _dd41represent crosstalking of sub-wavelength cycle differential pair and traditional differential pair.In Fig. 9, the parameter of simulation: w=w ₁=w ₂=w ₃=w ₄=1.2mm, the total length of microstrip line is 10cm, substrate 21 use frequency P CB sheet material RO4003 materials, thickness of metal film t=0.0175mm, thickness of slab h=0.508mm, groove depth b=0.6w,, Cycle Length d=1.0mm, the frequency range of analysis by 200MHz to 12GHz, S _cd21the conversion effect that represents differential-mode signal and common-mode signal.

The result of the coupling circuit of the 2nd two groups of embodiment tradition differential pair is as shown in Fig. 8, Fig. 9 solid line.As shown in Figure 8, wherein differential pair signal is entered by the first port 13, and the transmittability of being exported by the second port one 4 is by S Parametric Representation: S _dd21.S under the frequency of 200MHz _dd21=-0.08821dB, S under frequency 12GHz _dd21=-2.32492dB.As shown in Figure 8, wherein differential pair signal is entered by the first port 13, and the crosstalk effect of being exported by traditional differential pair the 4th port 23 is by S Parametric Representation: S _dd41, S under 200MHz frequency _dd41=-48.55245dB, S under 12GHz frequency _dd41=-9.38157dB.As shown in Figure 9, wherein differential pair signal enters effect that the differential mode by the second port one 4 output turns common mode by S Parametric Representation: S by the first port 13 _cd21, S when frequency is 12GHz _cd21=-12.37439dB.

The 2nd mono-group of embodiment is sub-wavelength hair clip differential pair and another group is the result of traditional differential pair outside the cycle, as shown in the dotted line of Fig. 8, Fig. 9.

As shown in the dotted line of Fig. 8, wherein differential pair signal is entered by the first port 13, and the transmittability of being exported by the second port one 4 is by S Parametric Representation: S _dd21.S under the frequency of 200MHz _dd21=-0.09344dB, S under frequency 12GHz _dd21=-1.20989dB.As shown in Figure 8, wherein differential pair signal is entered by the first port 13, and the crosstalk effect of being exported by traditional differential pair the 4th port 23 is by S Parametric Representation: S _dd41, S under 200MHz frequency _dd41=-63.57423dB, S under 12GHz frequency _dd41=-33.33179dB.As shown in Figure 9, wherein differential pair signal enters effect that the differential mode by the second port one 4 output turns common mode by S Parametric Representation: S by the first port 13 _cd21, S under 12GHz frequency _cd21=-35.91338dB.

The comparative result of the 2nd embodiment tradition differential pair and sub-wavelength hair clip differential pair outside the cycle, as shown in Figure 8, Figure 9.As shown in Figure 8, wherein, two groups of S that are traditional differential pair under 12GHz frequency _dd21=-2.32492dB, sub-wavelength cycle differential pair S _dd21=-1.20989dB.Transmittability has significant lifting in the situation that of high-frequency signal.As shown in Figure 8, wherein, traditional differential pair and the S that crosstalks of another traditional differential pair under 12GHz frequency _dd41=-9.38157dB, the crosstalk S of sub-wavelength cycle differential pair to traditional differential pair _dd41=-33.33179dB, crosstalks and obtains and suppress significantly.As shown in Figure 9, wherein, when frequency is 12GHz, traditional differential pair differential mode turns the effect S of common mode _cd21=-12.37439dB, the S of sub-wavelength cycle differential pair _cd21=-35.91338dB, differential mode turns common-mode effect and obtains inhibition.Aid illustration: Fig. 8 is the S calculation of parameter result of Fig. 7 coupling circuit.Consider the numerical result of Fig. 8, the S of traditional differential pair _dd21with solid line, represent, under 200MHz frequency, be-0.08821dB, under 12GHz frequency, be-2.32492dB.The S of sub-wavelength hair clip differential pair outside the cycle _dd21dot, under 200MHz frequency, be-0.09344dB, under 12GHz frequency, be-1.20989dB.Compared with low frequency in the situation that, traditional differential pair has slightly excellent transmittability.Yet along with the rising of frequency, the transmittability of sub-wavelength periodic structure is better, for electromagnetism magnetic field, has good constraint.Due to this to the strong constraint of electromagnetic field, sub-wavelength outside the cycle hair clip differential pair for contiguous microstrip line, obviously will have lower interference.Along with the increase of frequency is crosstalked more and more obvious.When 12GHz frequency, tradition differential configuration is for the S that crosstalks of another traditional differential pair _dd41for-9.38157dB.

And the S that crosstalks of sub-wavelength hair clip differential pair and another traditional differential pair outside the cycle _dd41be only-33.33179dB to there is obvious anti-crosstalk effect.Fig. 9 is that in coupling circuit, differential mode turns common mode with the result of variations of frequency.Rising along with frequency, the effect that differential mode turns common mode is all the more obvious, if yet differential pair is carved with sub-wavelength hairpin-type ripple outside the cycle, can effectively suppress the effect of conversion, the effect that the differential mode of tradition differential pair turns common-mode signal is-12.37439dB under 12GHz frequency, the differential mode of sub-wavelength hair clip differential pair outside the cycle turns the only have-35.91338dB of effect of common-mode signal, obviously exists sub-wavelength periodic structure can effectively suppress the conversion efficiency of differential mode to common mode.

The utility model provides groove differential pair outside the 3rd embodiment, as shown in figure 10, article two, sub-wavelength cycle microstrip line forms a differential pair, signal is by the first port 13 inputs, by the second port one 4 outputs, wherein the first microstrip line 11 is sent into signal, it is the signal (two for complementary signal) of 180 ° that the second microstrip line 12 is sent into the signal phase difference of sending into the first microstrip line 11, in the groove differential pair structure of outside, the structure of the plurality of groove, be that a rectangle concave volume 15 is the structure of consecutive periods in conjunction with a rectangle convex body 16, the spacing of adjacent this rectangle convex body 16, periodic arrangement length for the plurality of groove.The width of microstrip line: w, the interval of two microstrip lines: w ₁, the thickness of metal: t, the thickness of substrate 21 is: h, the Cycle Length of cycle microstrip line: d, the groove depth of cycle microstrip line: b, the dielectric constant of substrate 21 media: ε _r, when single ended microstrip or another group differential pair appear in the side of the differential pair of this tradition (smooth), there are two obvious effects, first effect is by the first port 13 to second port ones 4, will the obvious differential mode of appearance to be turned the effect of common mode.Second effect is will be crosstalked at another microstrip line or differential pair generation by the complementary signal of the first port 13 inputs.

In order to prove that this sub-wavelength cycle differential pair has crosstalking between inhibition and adjacent microstrip line or differential pair, and can effectively reduce the differential mode transition effects of intermode together, can consider the coupled circuit configuration of Figure 11 to carry out numerical analysis, Figure 11 is one group of sub-wavelength coupling circuit that outside the cycle, groove differential pair and traditional differential pair form, differential signal is by the first port 13 inputs, analyze the output of the second port one 4, can understand the transmittability of differential pair.By the first port 13 inputs, analyze the output of the 4th port 23, can understand crosstalking between differential pair and contiguous traditional differential pair.As shown in figure 11, the marginating compartment of sub-wavelength cycle microstrip line and traditional differential pair: w ₂, differential pair signal is entered by the first port 13, and the transmittability of being exported by the second port one 4 is by S Parametric Representation: S _dd21, differential pair signal enters crosstalk effect by the 4th port 23 output of traditional differential pair by S Parametric Representation: S by the first port 13 _dd41, differential pair signal is entered by the first port 13, and the effect that the differential mode of being exported by the second port one 4 turns common mode is by S Parametric Representation: S _cd21, wherein the transmission of tradition (conventional) two pairs of whole smooth differential pairs represents with solid line with the effect of crosstalking, the transmittability of sub-wavelength periodic structure differential pair and and traditional differential pair between crosstalk effect dot, the parameter of simulation: w=w ₁=w ₂=w ₃=w ₄=1.2mm, the total length of microstrip line is 10cm, the material of substrate 21 use RO4003, thickness of metal film t=0.0175mm, thickness of slab h=0.508mm, groove depth b=0.6w, Cycle Length d=1.0mm, the frequency range of analysis by 200MHz to 12GHz, the first port 13 is ports that two microstrip lines of differential pair are inputted complementary differential signal, the receiving terminal that the second port one 4 is differential pair, the 3rd port 22 represents the near-end of traditional differential pair, the 4th port 23 represents the far-end of traditional differential pair.Shown in Figure 12, the parameter of simulation: w=w ₁=w ₂=w ₃=w ₄=1.2mm, the total length of microstrip line is 10cm, the material of substrate 21 use RO4003, thickness of metal film t=0.0175mm, thickness of slab h=0.508mm, groove depth b=0.6w, Cycle Length d=1.0mm, the frequency range of analysis by 200MHz to 12GHz.S _dd21the transmittability that represents signal, S _dd41represent crosstalking of differential pair and adjacent traditional differential pair.Shown in Figure 13, the parameter of simulation: w=w ₁=w ₂=w ₃=w ₄=1.2mm, the total length of microstrip line is 10cm, the material of substrate 21 use RO4003, thickness of metal film t=0.0175mm, thickness of slab h=0.508mm, groove depth b=0.6w, Cycle Length d=1.0mm, the frequency range of analysis by 200MHz to 12GHz.S _cd21the conversion effect that represents differential-mode signal and common-mode signal.

The utility model provides the result of two pairs of traditional differential pair coupling circuits of the 3rd embodiment as shown in Figure 12, Figure 13 solid line.As shown in figure 12, wherein differential pair signal is entered by the first port 13, and the transmittability of being exported by the second port one 4 is by S Parametric Representation: S _dd21. S under the frequency of 200MHz _dd21=-0.08821dB, S under 12GHz frequency _dd21=-2.32492dB.As shown in figure 12, wherein differential pair signal enters crosstalk effect by the 4th port 23 output of traditional differential pair by S Parametric Representation: S by the first port 13 _dd41, S under 200MHz frequency _dd41=-48.55245dB, S under 12GHz _dd41=-9.38157dB.As shown in figure 13, wherein differential pair signal enters effect that the differential mode by the second port one 4 output turns common mode by S Parametric Representation: S by the first port 13 _cd21, S under 12GHz frequency _cd21=-12.37439dB.

The utility model provides the result of the coupling circuit that groove differential pair and traditional differential pair form outside the 3rd embodiment as shown in the dotted line of Figure 12, Figure 13.As shown in figure 12, wherein differential pair signal enters transmittability by the second port one 4 output by S Parametric Representation: S by the first port 13 _dd21.S under the frequency of 200MHz _dd21=-0.07265dB, S under frequency 12GHz _dd21=-1.14271dB.As shown in figure 12, wherein differential pair signal enters crosstalk effect by the 4th port 23 output of traditional differential pair by S Parametric Representation: S by the first port 13 _dd41, S under the frequency of 200MHz _dd41=-61.53771dB, S under the frequency of 12GHz _dd41=-36.11641dB, and frequency 1GHz is S under the frequency of 5.36GHz to the maximum of crosstalking in 10GHz interval _dd41=-32.2849dB.As shown in figure 13, wherein differential pair signal is entered by the first port 13, and the effect that the differential mode of being exported by the second port one 4 turns common mode is by S Parametric Representation: S _cd21, S under the frequency of 12GHz _cd21=-19.69095dB.

The utility model provides the comparative result of groove differential pair and traditional differential pair outside the 3rd embodiment, as shown in Figure 12 and Figure 13.As shown in figure 12, traditional differential pair S under the frequency of 12GHz wherein _dd21=-2.32492dB, sub-wavelength cycle differential pair S _dd21=-1.14271dB, transmittability has significant lifting in the situation that of high-frequency signal.As shown in figure 12, the S that crosstalks between two pairs of traditional differential pairs under the frequency of 12GHz wherein _dd41=-9.38157dB, the S that crosstalks of sub-wavelength cycle differential pair and traditional differential pair _dd41=-36.11641dB, crosstalk phenomenon obtains inhibition significantly.As shown in figure 13, wherein under the frequency of 12GHz, traditional differential pair differential mode turns the effect S of common mode _cd21=-12.37439dB, the differential mode of sub-wavelength cycle differential pair turns common-mode effect S _cd21=-19.69095dB, differential mode turns common-mode effect and obtains inhibition.Aid illustration: Figure 12 is the S calculation of parameter result of the coupling circuit of Figure 11.Consider the numerical result of Figure 12, the S of traditional differential pair _dd21with solid line, represent, under the frequency of 200MHz, be-0.08821dB, under the frequency of 12GHz, be-2.32492dB.The S of sub-wavelength groove differential pair outside the cycle _dd21dot, under the frequency of 200MHz, be-0.07265dB, under the frequency of 12GHz, be-1.14271dB.Compared with low frequency in the situation that, differential pair has slightly excellent transmittability the sub-wavelength cycle, and along with the rising of frequency, the transmittability of sub-wavelength periodic structure is better, for electromagnetism magnetic field, has good constraint.Due to this to the strong constraint of electromagnetic field, sub-wavelength outside the cycle groove differential pair for contiguous microstrip line or traditional smooth differential pair, obviously will have lower interference.Along with the increase of frequency, crosstalk more and more obviously, when frequency is 12GHz, tradition differential configuration is for the S that crosstalks of another traditional differential pair _dd41for-9.38157dB, and the S that crosstalks of sub-wavelength groove differential pair and traditional differential pair outside the cycle _dd41be only-36.11641dB to there is obvious anti-crosstalk effect.Figure 13 is that in coupling circuit, differential mode turns common mode with the result of variations of frequency.Along with the rising of frequency, the effect that differential mode turns common mode is all the more obvious.Yet if differential pair is carved with sub-wavelength cycle outer concave slot wave line, can effectively suppress the effect of conversion.The effect that the differential mode of tradition differential pair turns common-mode signal is S under 12GHz frequency _cd21=-12.37439dB, the differential mode of sub-wavelength groove differential pair outside the cycle turns the effect of common-mode signal and only has S _cd21=-19.69095dB, obviously exists sub-wavelength periodic structure can effectively suppress the conversion efficiency of differential mode to common mode.

The utility model provides the 4th embodiment double-side opening stomatodeum slot type differential pair, as shown in Figure 14, Figure 15.Article two, sub-wavelength cycle microstrip line forms a differential pair, signal is by the first port 13 inputs, by the second port one 4 outputs, wherein one is that article one microstrip line 11 is sent into signal, another is that to send into the signal phase difference of sending into article one microstrip line 11 be the signal (two for complementary signal) of 180 ° to second microstrip line 12, in the structure of double-side opening stomatodeum slot type differential pair, the structure of the plurality of groove, it is a rectangle concave volume 15, the structure that is consecutive periods in conjunction with a rectangle convex body 16, and in the opening part of each groove, one this rectangle convex body 16 has two the first extensions 17 that extend in parallel to these groove central authorities, the width of microstrip line is w, article two, the interval of microstrip line is w ₁, the thickness of the metal of two microstrip lines is t, and the thickness of substrate 21 is h, and the Cycle Length of cycle microstrip line is d, and the groove depth of cycle microstrip line is b, the dielectric constant of substrate 21 media is ε _r, when single ended microstrip or another group differential pair appear in the side of the smooth unnotched differential pair of this tradition, there are two obvious effects, first effect is will to occur that obvious differential mode turns the effect of common mode by the first port 13 to second port ones 4.Second effect is that the complementary signal of being inputted by the first port 13 will produce and crosstalk on another microstrip line or differential pair, for prove that this sub-wavelength cycle differential pair can suppress and adjacent microstrip line between crosstalk, and can effectively reduce the differential mode transition effects of intermode together, can consider that the coupled circuit configuration of Figure 15 is carried out numerical analysis.

As shown in figure 15, be one group of sub-wavelength cycle double-side opening port recess, the coupling circuit that the first microstrip line 11 and the second microstrip line 12 and traditional differential pair form.Differential signal, by the first port 13 inputs, is analyzed the output of the second port one 4, can understand the transmittability of differential pair.By the first port 13 input, the output of analyzing the 4th port 23 can understand differential pair be close to traditional differential pair between crosstalk.The interval at tradition differential pair and second microstrip line 12 edges is w ₂, the transmittability that differential pair signal is entered by the second port one 4 outputs by the first port 13 is S by S Parametric Representation _dd21, the crosstalk effect that differential pair signal is entered by the 4th port 23 outputs of traditional differential pair by the first port 13 is S by S Parametric Representation _dd41, it is S by S Parametric Representation that differential pair signal enters by the first port 13 effect that differential mode by the second port one 4 output turns common mode _cd21, wherein the transmission of the whole smooth differential pairs of tradition (conventional) represents with solid line with the effect of crosstalking, the transmission of sub-wavelength periodic structure differential pair dots with the effect of crosstalking.As shown in Figure 16 and Figure 17, the parameter of simulation: w=w ₁=w ₂=w ₃=w ₄=1.2mm, the total length of microstrip line is 10cm, the material of substrate 21 use RO4003, thickness of metal film t=0.0175mm, thickness of slab h=0.508mm, the groove depth on both sides is respectively b=0.3w, Cycle Length d=1.0mm, the frequency range of analysis by 200MHz to 12GHz.In Figure 15, the first port 13 is that two microstrip lines are inputted complementary differential signal; The receiving terminal that the second port one 4 is differential pair, the 3rd port 22 represent the near-end of traditional differential pair, the far-end that the 4th port 23 represents traditional differential pair, the wherein S of Figure 16 _dd21the transmittability that represents signal, S _dd41represent crosstalking of differential pair and adjacent traditional differential pair, wherein the S of Figure 17 _cd21the conversion effect that represents differential-mode signal and common-mode signal.

The result that the 4th two groups of embodiment differential pair is traditional differential pair is as shown in the solid line of Figure 16, Figure 17.As shown in figure 16, wherein differential pair signal enters transmittability by the second port one 4 output by S Parametric Representation: S by the first port 13 _dd21.S under the frequency of 200MHz _dd21=-0.08821dB, S under frequency 12GHz _dd21=-2.32492dB.As shown in figure 16, wherein differential pair signal enters crosstalk effect by the 4th port 23 output of traditional differential pair by S Parametric Representation: S by the first port 13 _dd41, S under 200MHz frequency _dd41=-48.55245dB, S under 12GHz frequency _dd41=-9.38157dB.As shown in figure 17, wherein differential pair signal enters effect that the differential mode by the second port one 4 output turns common mode by S Parametric Representation: S by the first port 13 _cd21, S when frequency is 12GHz _cd21=-12.37439dB.

The result of the 4th embodiment sub-wavelength double-side opening stomatodeum slot type differential pair and traditional differential pair coupling circuit is as shown in the dotted line of Figure 16, Figure 17.As shown in figure 16, wherein differential pair signal enters transmittability by the second port one 4 output by S Parametric Representation: S by the first port 13 _dd21.S under the frequency of 200MHz _dd21=-0.07977dB, S under frequency 12GHz _dd21=-1.0001dB.As shown in figure 16, wherein differential pair signal enters crosstalk effect by the 4th port 23 output of traditional differential pair by S Parametric Representation: S by the first port 13 _dd41, S under 200MHz frequency _dd41=-49.2638dB, S under 12GHz frequency _dd41=-30.72547dB, and 1GHz is S under 5.26GHz to the maximum of crosstalking of 10GHz frequency separation _dd41=-24.5046dB.As shown in figure 17, wherein differential pair signal by the first port 13 enter by the second port one 4 output differential modes, turn common mode effect by S Parametric Representation: S _cd21, S when frequency is 12GHz _cd21=-28.37445dB.

The 4th embodiment sub-wavelength double-side opening stomatodeum slot type differential pair and traditional differential pair comparative result as shown in Figure 16, Figure 17.As shown in figure 16, traditional differential pair S when frequency is 12GHz wherein _dd21=-2.32492dB, sub-wavelength cycle differential pair S _dd21=-1.0001dB, transmittability has significant lifting in the situation that of high-frequency signal.As shown in figure 16, wherein under 12GHz frequency traditional differential pair and another traditional differential pair between the S that crosstalks _dd41=-9.38157dB, the S that crosstalks between sub-wavelength cycle differential pair and traditional differential pair _dd41=-30.72547dB, crosstalk phenomenon obtains inhibition significantly.As shown in figure 17, in frequency, be wherein the effect S that differential pair differential mode that 12GHz is traditional turns common mode _cd21=-12.37439dB, sub-wavelength cycle differential pair S _cd21=-28.37445dB, differential mode turns common-mode effect and obtains inhibition.Aid illustration: Figure 16 is the S calculation of parameter result of Figure 15 coupling circuit.Consider the numerical result of Figure 16, the S of traditional differential pair _dd21with solid line, represent, under 200MHz frequency, be-0.08821dB, under 12GHz frequency, be-2.32492dB.The S of sub-wavelength cycle double-side opening stomatodeum slot type differential pair _dd21dotting, is that 200MHz is-0.07977dB in frequency, in frequency, is that 12GHz is-1.0001dB.Obviously the transmittability of sub-wavelength periodic structure is better, for electromagnetic field, has good constraint.Due to this, to the strong constraint of electromagnetic field, sub-wavelength cycle double-side opening stomatodeum slot type differential pair obviously will have lower interference for contiguous microstrip line.Along with the increase of frequency, crosstalk more and more obviously, when frequency is 12GHz, tradition differential configuration is for the S that crosstalks of another traditional differential configuration _dd41for-9.38157dB, and the S that crosstalks of sub-wavelength cycle double-side opening stomatodeum slot type differential pair and traditional differential configuration _dd41be only-30.72547dB that sub-wavelength cycle double-side opening stomatodeum slot type differential pair has obvious anti-crosstalk effect.Figure 17 is that in coupling circuit, differential mode turns common mode with the result of variations of frequency.Along with the rising of frequency, the effect that differential mode turns common mode is all the more obvious.Yet if differential pair is carved with sub-wavelength cycle double-side opening stomatodeum slot type ripple, can effectively suppress the effect of conversion.The effect that the differential mode of tradition differential pair turns common-mode signal is S when frequency is 12GHz _cd21=-12.37439dB, the differential mode of sub-wavelength cycle double-side opening stomatodeum slot type differential pair turns the effect of common-mode signal and only has S _cd21=-28.37445dB, obviously exists sub-wavelength periodic structure can effectively suppress the conversion efficiency of differential mode to common mode.

The 5th embodiment sub-wavelength cycle bilateral groove type differential pair, as shown in figure 18, article two, sub-wavelength cycle microstrip line forms a differential pair, signal is by the first port 13 inputs, by the second port one 4 outputs, wherein one is that the first microstrip line 11 is sent into signal, another is that to send into phase difference be 180 ° of signals (two for complementary signal) to second microstrip line 12, in bilateral groove differential pair structure, the structure of the plurality of groove, be that a rectangle concave volume 15 is the structure of consecutive periods in conjunction with a rectangle convex body 16, the spacing of this adjacent rectangle convex body 16, periodic arrangement length for these grooves.The width of microstrip line: w, the interval of two microstrip lines: w ₁, the thickness of metal: t, the thickness of substrate 21 is: h, the Cycle Length of cycle microstrip line: d, the groove depth of cycle microstrip line: b, the dielectric constant of substrate 21 media: ε _r, groove width: a.When there is single ended microstrip or another group differential pair in the side of the differential pair of this tradition (smooth), there are two obvious effects, first effect is will occur that by the first port 13 to second port ones 4 obvious differential mode turns the effect of common mode, and second effect is will be at another microstrip line or differential pair generation crosstalk effect by the complementary signal of the first port 13 inputs.For prove that this sub-wavelength cycle differential pair can suppress and adjacent microstrip line between crosstalk, and can effectively reduce the differential mode transition effects of intermode together, can consider that the coupled circuit configuration of Figure 19 carries out numerical analysis, Figure 19 is the coupling circuit that one group of sub-wavelength cycle bilateral groove type differential pair and single ended microstrip form, differential signal is by the first port 13 inputs, analyze the output of the second port one 4, can understand the transmittability of differential pair.By the first port 13 inputs, analyze the output of the 4th port 23, can understand crosstalking between differential pair and contiguous single ended microstrip.As shown in figure 19, the interval of single ended microstrip and differential pair: w ₂, differential pair signal enters transmittability by the second port one 4 output by S Parametric Representation: S by the first port 13 _dd21, differential pair signal enters crosstalk effect by single ended microstrip the 4th port 23 output by S Parametric Representation: S by the first port 13 _sd41, differential pair signal enters effect that the differential mode by the second port one 4 output turns common mode by S Parametric Representation: S by the first port 13 _cd21, wherein the transmission of the whole smooth differential pairs of tradition (conventional) represents with solid line with the effect of crosstalking, the transmission of sub-wavelength periodic structure differential pair dots with the effect of crosstalking, the parameter of simulation: w=w ₁=w ₂=w ₃=1.2mm, the total length of microstrip line is 10cm, substrate 21 RO4003 material, thickness of metal film t=0.0175mm, thickness of slab h=0.508mm, groove depth b=0.3w, Cycle Length d=1.0mm, the frequency range of analysis by 200MHz to 12GHz, the first port 13 is inputted complementary differential signal by two microstrip lines, the receiving terminal that the second port one 4 is differential pair, the 3rd port 22 represents the near-end of single ended microstrip, the 4th port 23 represents the far-end of single ended microstrip.Shown in Figure 20, the parameter of simulation: w=w ₁=w ₂=w ₃=1.2mm, the total length of microstrip line is 10cm, substrate 21 RO4003 material, thickness of metal film t=0.0175mm, thickness of slab h=0.508mm, groove depth b=0.3w, Cycle Length d=1.0mm, the frequency range of analysis by 200MHz to 12GHz.S _dd21the transmittability that represents signal, S _sd41represent crosstalking of differential pair and adjacent single ended microstrip.Shown in Figure 21, the parameter of simulation: w=w ₁=w ₂=w ₃=1.2mm, the total length of microstrip line is 10cm, the material of substrate 21 use RO4003, thickness of metal film t=0.0175mm, thickness of slab h=0.508mm, groove depth b=0.3w, Cycle Length d=1.0mm, d=2a, the scope of analysis by 200MHz to 12GHz.S _cd21the conversion effect that represents differential-mode signal and common-mode signal.

The utility model provides the result of the 5th embodiment tradition differential pair and single ended microstrip coupling circuit as shown in the solid line of Figure 20, Figure 21.As shown in figure 20, wherein differential pair signal enters transmittability by the second port one 4 output by S Parametric Representation: S by the first port 13 _dd21. S under the frequency of 200MHz _dd21=-0.0679dB, S under frequency 12GHz _dd21=-2.36253dB.As shown in figure 20, wherein differential pair signal enters crosstalk effect by single ended microstrip the 4th port 23 output by S Parametric Representation: S by the first port 13 _sd41, S under 200MHz frequency _sd41=-42.63854dB, S under 12GHz frequency _sd41=-6.55742dB.As shown in figure 21, wherein differential pair signal enters effect that the differential mode by the second port one 4 output turns common mode by S Parametric Representation: S by the first port 13 _cd21, S when 12GHz _cd21=-12.96263dB.

The utility model provides the result of the 5th embodiment bilateral groove type differential pair and single ended microstrip coupling circuit as shown in Figure 20, Figure 21 dotted line.As shown in figure 20, wherein differential pair signal enters transmittability by the second port one 4 output by S Parametric Representation: S by the first port 13 _dd21.S under the frequency of 200MHz _dd21=-0.10201dB, S under frequency 12GHz _dd21=-1.18541dB.As shown in figure 20, wherein differential pair signal enters crosstalk effect by single ended microstrip the 4th port 23 output by S Parametric Representation: S by the first port 13 _sd41, S under 200MHz _sd41=-42.82679dB, S under 12GHz frequency _sd41=-13.93195dB.As shown in figure 21, wherein differential pair signal enters effect that the differential mode by the second port one 4 output turns common mode by S Parametric Representation: S by the first port 13 _cd21, S when frequency is 12GHz _cd21=-23.28997dB.

The utility model provides the comparative result of the 5th embodiment bilateral groove type differential pair and single ended microstrip, as shown in Figure 20, Figure 21.As shown in figure 20, traditional differential pair S when frequency is 12GHz wherein _dd21=-2.36253dB, sub-wavelength cycle differential pair S _dd21=-1.18541dB, transmittability has significant lifting in the situation that of high-frequency signal.As shown in figure 20, wherein traditional differential pair and the S that crosstalks of single ended microstrip when frequency is 12GHz _sd41=-6.55742dB, sub-wavelength cycle differential pair S _sd41=-13.93195dB, crosstalks and obtains and suppress significantly.As shown in figure 21, wherein when frequency is 12GHz, traditional differential pair differential mode turns the effect S of common mode _cd21=-12.96263dB, the S of sub-wavelength cycle differential pair _cd21=-23.28997dB, differential mode turns common-mode effect and obtains inhibition.Aid illustration: Figure 20 is the S calculation of parameter result of Figure 19 coupling circuit.Consider the numerical result of Figure 20, the S of traditional differential pair _dd21with solid line, represent, under 200MHz frequency, be-0.0679dB, under 12GHz frequency, be-2.36253dB.The S of sub-wavelength cycle bilateral groove type differential pair _dd21dot, when frequency is 200MHz, be-0.10201dB, when frequency is 12GHz, be-1.18541dB.Compared with low frequency in the situation that, traditional differential pair has slightly excellent transmittability, yet along with the rising of frequency, the transmittability of sub-wavelength periodic structure is better, for electromagnetic field, has good constraint.Due to this, to the strong constraint of electromagnetic field, sub-wavelength cycle bilateral groove type differential pair obviously will have lower interference for contiguous microstrip line.Along with the increase of frequency, crosstalk more and more obviously, when frequency is 12GHz, tradition differential configuration is for the S that crosstalks of single ended microstrip _sd41for-6.55742dB, and the S that crosstalks of sub-wavelength cycle bilateral groove type differential pair and single ended microstrip _sd41be only-13.93195dB to there is obvious anti-crosstalk effect.Figure 21 is that in coupling circuit, differential mode turns common mode with the result of variations of frequency.Along with the rising of frequency, the effect that differential mode turns common mode is all the more obvious.Yet if differential pair is carved with sub-wavelength cycle bilateral groove type ripple, can effectively suppress the effect of conversion.The effect that the differential mode of tradition differential pair turns common-mode signal is S under 12GHz frequency _cd21=-12.96263dB, the differential mode of sub-wavelength cycle bilateral groove type differential pair turns the effect of common-mode signal and only has S _cd21=-23.28997dB.Obviously, sub-wavelength periodic structure can effectively suppress the conversion efficiency of differential mode to common mode.

The utility model provides the 6th embodiment sub-wavelength cycle bilateral hairpin-type differential pair, as shown in figure 22, article two, sub-wavelength cycle microstrip line forms a differential pair, signal is by the first port 13 inputs, by the second port one 4 outputs, wherein one is the signal that article one microstrip line 11 is sent into, another is that second microstrip line 12 signal phase difference of sending into article one microstrip line 11 that send into is the signal (being two complementary signal) of 180 °, bilateral hair clip differential pair structure is the structure that a plurality of Z-type convex bodys 20 are consecutive periods, the plurality of Z-type convex body 20, there is one first extension 17, it is in the opening part of each this groove, to these groove central authorities, extend in parallel, and one second extension 18, it,, in each these Z-type convex body 20 middle section, extends in parallel to these groove central authorities, wherein, the bearing of trend of this first extension 17 and this second extension 18 is contrary.The width of microstrip line: w, the interval of two microstrip lines: w ₁, the thickness of metal: t, the thickness of substrate 21 is: h, the Cycle Length of cycle microstrip line: d, the groove depth of cycle microstrip line: b, the dielectric constant of substrate 21 media: ε _r, other structural parameters a ₁, a ₂(width of outward opening groove), a ₃(width of inner opening groove), b ₁(width of metal slice), b ₂(interval of metal slice).When there is single ended microstrip or another group differential pair in the side of the differential pair of this tradition (smooth), there are two obvious effects, first effect is by the first port 13 to second port ones 4, will the obvious differential mode of appearance to be turned the effect of common mode.Second effect is will be crosstalked at another microstrip line or differential pair generation by the complementary signal of the first port 13 inputs.In order to prove that this sub-wavelength cycle differential pair has crosstalking between inhibition and adjacent microstrip line, and can effectively reduce the differential mode transition effects of intermode together, can consider the coupled circuit configuration of Figure 24 to carry out numerical analysis.Figure 24 is the coupling circuit that one group of sub-wavelength cycle hairpin-type differential pair and single ended microstrip form.Differential signal, by the first port 13 inputs, is analyzed the output of the second port one 4, can understand the transmittability of differential pair.By the first port 13 inputs.Analyze the output of the 4th port 23 and can understand crosstalking between differential pair and single ended microstrip.The interval of single ended microstrip and differential pair: w ₂, differential pair signal enters transmittability by the second port one 4 output by S Parametric Representation: S by the first port 13 _dd21, differential pair signal enters crosstalk effect by single ended microstrip the 4th port 23 output by S Parametric Representation: S by the first port 13 _sd41, differential pair signal enters effect that the differential mode by the second port one 4 output turns common mode by S Parametric Representation: S by the first port 13 _cd21, wherein the transmission of the whole smooth differential pairs of tradition (conventional) represents with solid line with the effect of crosstalking, the transmission of sub-wavelength periodic structure differential pair dots with the effect of crosstalking.The parameter of simulation: w=w ₁=w ₂=w ₃=1.2mm, the total length of microstrip line is 10cm, substrate 21 RO4003 material, thickness of metal film t=0.0175mm, thickness of slab h=0.508mm, groove depth b=0.3w, Cycle Length d=1.0mm, the scope of analysis by 200MHz to 12GHz.In Figure 24, the first 13 two of ports microstrip line is inputted complementary differential signal, the receiving terminal that the second port one 4 is differential pair, and the 3rd port 22 is near-ends of single ended microstrip, the 4th port 23 represents the far-end of single ended microstrip.In Figure 25, the parameter of simulation: w=w ₁=w ₂=w ₃=1.2mm, the total length of microstrip line is 10cm, the material of substrate 21 use RO4003, thickness of metal film t=0.0175mm, thickness of slab h=0.508mm, groove depth b=0.3w,, Cycle Length d=1.0mm, the frequency range of analysis by 200MHz to 12GHz, S _dd21the transmittability that represents signal, S _sd41crosstalking between expression sub-wavelength cycle differential pair and single ended microstrip, other parameters a ₁=0.1d, a ₂=0.2d, a ₃=0.7d, b ₁=b ₂=0.25b.In Figure 26, the parameter of simulation: w=w ₁=w ₂=w ₃=1.2mm, the total length of microstrip line is 10cm, the material of substrate 21 use RO4003, thickness of metal film t=0.0175mm, thickness of slab h=0.508mm, groove depth b=0.3w, Cycle Length d=1.0mm, the frequency range of analysis by 200MHz to 12GHz, S _cd21the conversion effect that represents differential-mode signal and common-mode signal.

The result of the 6th embodiment tradition differential pair and single ended microstrip coupling circuit is as shown in Figure 25, Figure 26 solid line.As shown in figure 25, wherein differential pair signal enters transmittability by the second port one 4 output by S Parametric Representation: S by the first port 13 _dd21.S under the frequency of 200MHz _dd21=-0.0679dB, S under frequency 12GHz _dd21=-2.36253dB.As shown in figure 25, wherein differential pair signal enters crosstalk effect by single ended microstrip the 4th port 23 output by S Parametric Representation: S by the first port 13 _sd41, in frequency, be S under 200MHz _sd41=-42.63854dB, frequency is S under 12GHz _sd41=-6.55742dB.As shown in figure 26, wherein differential pair signal enters effect that the differential mode by the second port one 4 output turns common mode by S Parametric Representation: S by the first port 13 _cd21, S when frequency is 12GHz _cd21=-12.96263dB.

The result of the 6th embodiment sub-wavelength cycle bilateral hairpin-type differential pair and single ended microstrip coupling circuit, as shown in Figure 25, Figure 26 dotted line.As shown in figure 25, wherein, differential pair signal enters transmittability by the second port one 4 output by S Parametric Representation: S by the first port 13 _dd21.S under the frequency of 200MHz _dd21=-0.11412dB, S under frequency 12GHz _dd21=-1.1716dB.As shown in figure 25, wherein differential pair signal enters crosstalk effect by single ended microstrip the 4th port 23 output by S Parametric Representation: S by the first port 13 _sd41, S under 200MHz frequency _sd41=-43.8893dB, S under 12GHz frequency _sd41=-23.45903dB.As shown in figure 26, wherein differential pair signal enters effect that the differential mode by the second port one 4 output turns common mode by S Parametric Representation: S by the first port 13 _cd21, S when frequency is 12GHz _cd21=-36.05781dB.

The comparative result of the 6th embodiment tradition differential pair and sub-wavelength cycle bilateral hairpin-type differential pair, as shown in Figure 25, Figure 26.As shown in figure 25, the S of traditional differential pair when frequency is 12GHz wherein _dd21=-2.36253dB, and the S of sub-wavelength cycle differential pair _dd21only drop to-1.1716dB, transmittability has significant lifting in the situation that of high-frequency signal.As shown in figure 25, wherein traditional differential pair and the S that crosstalks of single ended microstrip under 12GHz frequency _sd41=-6.55742dB, crosstalking of sub-wavelength cycle differential pair and single ended microstrip is S _sd41=-23.45903dB, crosstalks and obtains and suppress significantly.As shown in figure 26, wherein under 12GHz frequency, traditional differential pair differential mode turns the effect S of common mode _cd21=-12.96263dB, the S of sub-wavelength cycle differential pair _cd21=-36.05781dB, differential mode turns common-mode effect and obtains inhibition.Aid illustration: Figure 25 is the S calculation of parameter result of Figure 24 coupling circuit.Consider the numerical result of Figure 25, the S of traditional differential pair _dd21with solid line, represent, under 200MHz frequency, be-0.0679dB, under 12GHz frequency, be-2.36253dB.The S of sub-wavelength cycle bilateral hairpin-type differential pair _dd21dot, under 200MHz frequency, be-0.11412dB, under 12GHz frequency, be-1.1716dB.Compared with low frequency in the situation that, traditional differential pair has slightly excellent transmittability, yet along with the rising of frequency, the transmittability of sub-wavelength periodic structure is better, for electromagnetism magnetic field, has good constraint.Due to this, to the strong constraint of electromagnetic field, sub-wavelength cycle bilateral hairpin-type differential pair obviously will have lower interference for contiguous microstrip line.Along with the increase of frequency, crosstalk more and more obviously, when frequency is 12GHz, tradition differential configuration is for the S that crosstalks of single ended microstrip _sd41for-6.55742dB, and the S that crosstalks of sub-wavelength cycle bilateral hairpin-type differential pair and single ended microstrip _sd41be only-23.45903dB to there is obvious anti-crosstalk effect.Figure 26 is that in coupling circuit, differential mode turns common mode with the result of variations of frequency.Along with the rising of frequency, the effect that differential mode turns common mode is all the more obvious.Yet if differential pair is carved with sub-wavelength cycle bilateral hairpin-type ripple, can effectively suppress the effect of conversion.The effect that the differential mode of tradition differential pair turns common-mode signal is S under 12GHz frequency _cd21=-12.96263dB, the differential mode of sub-wavelength cycle bilateral hairpin-type differential pair turns the effect of common-mode signal and only has S _cd21=-36.05781dB, obviously exists sub-wavelength periodic structure can effectively suppress the conversion efficiency of differential mode to common mode.

The utility model provides a kind of differential pair microstrip line of the low high-frequency transmission of crosstalking, as the 4th embodiment, the 5th embodiment and the 6th embodiment, the plurality of groove, arrangement mode with sub-wavelength, as shown in Figure 14, Figure 18 and Figure 22, more include: be symmetrical in the plurality of groove in the outside of this first microstrip line 11, and be arranged in periodically the inner side of this first microstrip line 11; And the plurality of groove that is symmetrical in the outside of this second microstrip line 12, and be arranged in periodically the inner side of this second microstrip line 12.The distance between the inner side of this first microstrip line 11 and the inner side of this second microstrip line 12 wherein, as Figure 14, Figure 18 and Figure 22 are depicted as w ₁.Therefore in the 4th embodiment, the 5th embodiment and the 6th embodiment, the both sides of the both sides of the first microstrip line 11 and this second microstrip line 12, the plurality of groove of arranging along microstrip line edge, has and the arrangement mode of sub-wavelength periodically.

The utility model provides a kind of groove type differential pair structure, as shown in Figure 10, Figure 18, the structure of this plurality of grooves wherein, as the 3rd embodiment, the 5th embodiment, be that a rectangle concave volume 15 is the structure of consecutive periods in conjunction with a rectangle convex body 16, the spacing of adjacent this rectangle convex body 16 is the periodic arrangement length of the plurality of groove.

The utility model provides a kind of open recess formula differential pair structure, as shown in Fig. 1, Figure 14, the structure of this plurality of grooves wherein, as the 1st embodiment, the 4th embodiment, be that a rectangle concave volume 15 is the structure of consecutive periods in conjunction with a rectangle convex body 16, and in the opening part of each groove, this rectangle convex body 16 has two the first extensions 17 that extend in parallel to these groove central authorities.

The utility model provides a kind of hairpin-type differential pair structure, as shown in Fig. 5, Figure 22, the structure of the plurality of groove wherein, as the 2nd embodiment, the 6th embodiment, for a plurality of Z-type convex bodys 20 are the structure of consecutive periods, in the opening part of each groove, one this Z-type convex body 20 has one first extension 17 extending in parallel to these groove central authorities, and in each Z-type convex body 20 middle section, have one second extension 18 extending in parallel to these groove central authorities, the bearing of trend of this first extension 17 and this second extension 18 is contrary.

The above, only notebook utility model is better embodiment or the embodiment that presents the adopted technological means of dealing with problems, and is not used for limiting the scope of the utility model patent working.Allly conform to the utility model patent claim context, or the equalization of doing according to the utility model the scope of the claims change and modify, being all the utility model the scope of the claims and containing.

Claims

1. a differential pair microstrip line for the low high-frequency transmission of crosstalking, is characterized in that, comprising:

One first microstrip line, it is for transmitting one first signal transmission, and this first microstrip line has a plurality of grooves of periodic arrangement; And

One second microstrip line, it is parallel to this first microstrip line, and in order to transmit one second signal transmission, this second signal transmission and this first signal transmission are that phase difference is the complementary signal of 180 °, and this second microstrip line has a plurality of grooves of periodic arrangement;

Wherein, the plurality of groove is in the mode of sub-wavelength, be arranged in periodically the outside of this first microstrip line and the outside of this second microstrip line, the mode of this sub-wavelength is the periodic arrangement length of the plurality of groove, be less than this first signal transmission of transmission and the wavelength of this second signal transmission, the plurality of groove provides and strengthens electromagnetic sub-wavelength constraint.

2. the differential pair microstrip line of the low high-frequency transmission of crosstalking as claimed in claim 1, is characterized in that, more contains:

One first port, it is the port of this first microstrip line and this second microstrip line input complementary signal; And

One second port, it is the port of this first microstrip line and this second microstrip line output complementary signal;

A plurality of these grooves of wherein arranging along microstrip line edge, for when by this first end port transmission complementary signal during to this second port, reduction differential mode turns the transition effects of common mode.

3. the differential pair microstrip line of the low high-frequency transmission of crosstalking as claimed in claim 2, is characterized in that, the plurality of groove, and the arrangement mode with sub-wavelength, more includes:

Be symmetrical in the plurality of groove in the outside of this first microstrip line, and be arranged in periodically the inner side of this first microstrip line; And

Be symmetrical in the plurality of groove in the outside of this second microstrip line, and be arranged in periodically the inner side of this second microstrip line.

4. the differential pair microstrip line of the low high-frequency transmission of crosstalking as claimed in claim 3, is characterized in that, more comprises:

One substrate, this one first microstrip line and this second microstrip line, be connected on this substrate.

5. the differential pair microstrip line of the low high-frequency transmission of crosstalking as claimed in claim 4, it is characterized in that the structure of the plurality of groove is that a rectangle concave volume is the structure of consecutive periods in conjunction with a rectangle convex body, the spacing of this adjacent rectangle convex body is the arrangement Cycle Length of the plurality of groove.

6. the differential pair microstrip line of the low high-frequency transmission of crosstalking as claimed in claim 4, it is characterized in that, the structure of the plurality of groove, that a rectangle concave volume is the structure of consecutive periods in conjunction with a rectangle convex body, and in the opening part of each groove, this rectangle convex body has two the first extensions that extend in parallel to these groove central authorities.

7. the differential pair microstrip line of the low high-frequency transmission of crosstalking as claimed in claim 4, is characterized in that, the structure of the plurality of groove, and for a plurality of Z-type convex bodys are the structure of consecutive periods, the plurality of Z-type convex body, comprising:

One first extension, it is used to the opening part of each this groove, to these groove central authorities, extends in parallel; And

One second extension, it is used to each this Z-type convex body middle section, to each these groove central authorities, extends in parallel;

Wherein, the bearing of trend of this first extension and this second extension is contrary.