CN114069180B - SSPP-based quadratic polynomial sinusoidal transition structure - Google Patents
SSPP-based quadratic polynomial sinusoidal transition structure Download PDFInfo
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- 230000007704 transition Effects 0.000 title claims abstract description 41
- 239000002184 metal Substances 0.000 claims abstract description 40
- 229910052751 metal Inorganic materials 0.000 claims abstract description 40
- 230000008859 change Effects 0.000 claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 239000000758 substrate Substances 0.000 claims description 33
- 230000000737 periodic effect Effects 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
- H01P3/08—Microstrips; Strip lines
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Abstract
The invention discloses a quadratic polynomial sine transition structure based on SSPP, and belongs to the technical field of electromagnetic wave transmission function devices. A transition structure from a coplanar waveguide to an SSPP structure is improved. The transition part adopts a Vivaldi antenna fan-shaped metal patch, and the height of the transition groove adopts a transition structure formed by quadratic polynomial sine change. Compared with the original uniform linear gradual change structure, the structure is easier to realize impedance matching and improve in-band S parameters. The port reflection coefficient of the quadratic polynomial sine structure is reduced by 5 to 10dB in the band compared with that of the linear port reflection coefficient; the quadratic polynomial sinusoidal structure eliminates the stop band at 3GHz in the 0 to 8GHz band compared to the straight line structure. The transition structure has dynamic adjustment capability for the Vivaldi antenna sector metal patch, can better realize impedance change and wave vector matching, and improves port reflection coefficient and transmission coefficient.
Description
Technical Field
The invention belongs to the technical field of electromagnetic wave transmission function devices, and relates to a quadratic polynomial sine transition structure.
Background
Artificial surface plasmons (Spoof Surface Plasmon Polariton, SSPP), which are electromagnetic waves transmitted along the surface of a metal periodic structure, are exponentially decaying in a direction perpendicular to the metal surface, similar to surface plasmons (Surface Plasmon Polariton, SPP), whose transmission mode is surface waves and has slow wave characteristics. With the advent of the 5G/6G information age, data rates have increased, and carrier frequencies have gradually entered the terahertz frequency band. Communication traffic of the communication service chip continuously breaks through moore's law, the traditional chip-board interconnection mode is increased along with the increase of frequency, link crosstalk and communication cost are continuously increased, high-speed surface wave communication can be realized by adopting a channel based on artificial surface plasmons (Spoof Surface Plasmon Polaritons, SSPP), and chip interconnection bottleneck of the traditional technology is broken through. The strong constraint of the SSPP transmission line can well reduce interference between adjacent channels, and can greatly improve the number of channels in a chip. Based on SSPP, realizing the interconnection between boards, reducing channel crosstalk under high data rate by using a surface wave transmission mode, combining with the dispersion characteristic of a new generation of semiconductor material to dynamically regulate and control the surface wave waveguide, realizing the communication between the reconfigurable boards without a grounding bottom board and wireless interconnection, and providing an intelligent, self-adaptive, low-loss and low-error rate interconnection technology for a communication center under a special scene; in the detection field, the characteristic of enhanced SSPP field can greatly improve the detection sensitivity, and the SSPP is influenced by the size parameters and the material properties of a transmission structure and can show different electrical characteristics for different substances to be detected.
In 2012, the university of southeast Cui Tiejun institute team proposed a two-dimensional SSPP transmission line based on printed circuit board technology (Printed Circuit Board, PCB), one side of the metal layer of the transmission line structure had a square groove of periodic sub-wavelength dimension, and the whole was in a single comb shape, and the two-dimensional SSPP transmission line was easy to process and easy to integrate compared with the three-dimensional transmission structure proposed in the past, and therefore, attention was paid to the fact that the Cui Tiejun professor subsequently proposed a double comb-shaped SSPP transmission line with double slots, the periodic unit structure of which was in an "H" shape, and the "H" shape periodic unit structure was then also in the classic model of the SSPP for people to study.
In 2014, university of eastern and south Ma Huifeng teaches a transition structure from a coplanar waveguide to an SSPP structure that can efficiently convert quasi-TEM waves in the coplanar waveguide to TM waves in the SSPP structure. In order to solve the problems of wave vector mismatch and impedance mismatch, a Vivaldi antenna and a gradual change groove structure are adopted in the transition structure, and the height change of the gradual change groove structure is linear.
However, a graded slot structure is added in the transition structure to achieve the purpose of wave vector matching, and the graded slot structure should be connected with a metal plate in the middle of the coplanar waveguide. Meanwhile, in order to achieve good impedance matching, metal plates on two sides of the coplanar waveguide are also connected with a gradual change structure, and the gradual change structure adopts a Vivaldi curve. The heights of the adopted grooves change linearly, but the Vivaldi curves adopted by the fan-shaped metal sheets change, so that the two grooves have uneven impedance change, unmatched impedance and higher port reflection coefficient, and meanwhile, the grooves with the linear change cannot be adjusted according to the arc change of the fan shape, so that unmatched impedance is caused. Therefore, the change form of the groove height is changed, the change is carried out according to a quadratic polynomial sine curve, and the curve is better fitted with a sector change arc curve, so that the impedance change is uniform, and the wave-vector conversion structure is more matched.
Disclosure of Invention
The invention aims to improve the defects of the prior art, and provides a quadratic polynomial sine transition structure capable of dynamically adjusting a transition groove structure according to the edges of a fan-shaped arc line, so that the reflection coefficient of a port is reduced, and out-of-band suppression is enhanced.
The invention discloses an SSPP-based quadratic polynomial sinusoidal transition structure, which comprises a Vivaldi antenna patch and a transition slot structure with slot height changing according to quadratic polynomial sinusoids, and the complete structure also comprises:
the transition groove is arranged on the upper surface of the substrate medium substrate;
the Vivaldi fan-shaped metal patch is arranged on the upper surface of the substrate medium substrate;
a periodic SSPP transmission structure disposed on the upper surface of the substrate dielectric substrate;
the two sides of the upper surface of the substrate medium substrate are connected with Vivaldi fan-shaped metal patches in a metal mode, a middle metal belt is connected with a transition groove structure of quadratic polynomial sine change, then the transition groove structure is connected with a periodic SSPP transmission structure, and the upper part, the lower part, the left part and the right part are completely symmetrical.
Further, the arc line of the fan-shaped metal patch is changed according to the Vivaldi antenna, and the height of the transition groove structure is changed according to a quadratic polynomial sine curve;
the Vivaldi curve is expressed as:
y＝C 1 e αx +C 2 (1-1)
wherein: x is x 1 ＜x＜x 2 Alpha is the curvature of the curve, (x) 1 ,y 1 ) Is the curve starting point, (x) 2 ,y 2 ) Is the end point of the curve, and:
optimization result curvature α=0.15, starting point (0,1.2), end point (19.5,7.2);
a quadratic polynomial sine expression:
a in the formula i ＝1mm，a o Optimized curvature k=0.5, m and n take 2, l is the total transition length 40mm, z is the length variable.
Further, the material of the substrate dielectric substrate is F4B, and the metal material is copper.
Further, the length l=114 mm, the thickness d1=1.52 mm and the width w1=20 mm of the substrate dielectric substrate;
upper surface metal thickness d2=0.018 mm, two-sided metal Vivaldi antenna patch width l1=7 mm, length l2=19.5 mm;
the width s=2 mm of the starting point of the middle metal, the distance w 2=9 mm of the edge from the middle metal, and the interval g=0.2 mm between the middle metal and the fan-shaped metal patches on the two sides;
the metal height of the transition groove part varies sinusoidally according to a quadratic polynomial, the period length p=6mm of the H-shaped unit of the SSPP periodic structure, the total unit width h1=10mm, the groove depth h2=4mm, the groove width a=2mm, and the total length L4=34 mm of the periodic structure;
the two sides of the upper, lower, left and right structures are completely symmetrical.
The invention has the following advantages:
1) The adoption of the quadratic polynomial sine transition groove can be more easily fitted with the Vivaldi sector arc line, so that the transformation of impedance matching is realized;
2) Compared with a linear gradual change groove, the invention can dynamically adjust along with the change of the shape and the length of the sector patch, but not the linear fixation of the original structure, thereby increasing the diversity of impedance matching;
3) The invention reduces the reflection coefficient of the port under the condition of realizing port impedance matching, and simultaneously eliminates the in-band stop band, thereby improving the S parameter performance as a whole.
Drawings
FIG. 1 is a schematic diagram of a front structure of a quadratic polynomial sinusoidal transition provided by the invention;
FIG. 2 is a schematic side view of a side view of the present invention;
FIG. 3 shows a Vivaldi fan-shaped patch with a transition part structure and a quadratic polynomial sine transition groove;
FIG. 4 is a schematic diagram of the periodic structure of an SSPP provided by the present invention;
FIG. 5 is a graph of simulation results of port reflection coefficients S11 for straight lines and polynomial sinusoids provided by the present invention;
fig. 6 is a graph of simulation results of the forward transmission coefficient S21 of the straight line and the polynomial sine provided by the invention.
Detailed Description
The invention refers to a vacancy definition: on a complete planar layered structure, the partial areas are removed from the structural material and the missing portions are called voids.
As shown in fig. 1, 2, 3 and 4, the invention comprises four fan-shaped metal patches 1, a quadratic polynomial sine change groove, an SSPP periodic H-shaped unit structure 3 and a substrate medium F4B.
The invention comprises a substrate dielectric substrate 4, wherein the initial two sides of the upper surface of the substrate dielectric substrate 4 are connected with Vivaldi fan-shaped metal patches through metal, a middle metal belt is connected with a transition groove structure 2 with a quadratic polynomial sine change, and then the transition groove structure 2 is connected with a periodic SSPP transmission structure, and the upper part, the lower part and the left part are completely symmetrical.
As shown in fig. 2, 3 and 4, the geometric parameters of the complete structure are as follows:
the length l=114 mm, the thickness d1=1.52 mm and the width w1=20 mm of the substrate dielectric substrate 4;
the thickness d2=0.018 mm of the metal on the upper surface, the width L1=7 mm of the metal Vivaldi antenna patch on two sides and the length L2=19.5 mm, and the arc adopts a Vivaldi antenna expression;
the width s=2 mm of the starting point of the middle metal, the distance w 2=9 mm of the edge from the middle metal, and the interval g=0.2 mm between the middle metal and the fan-shaped metal patches on the two sides;
the height of the transition groove structure 2 varies sinusoidally according to a quadratic polynomial, the period length p=6mm of the H-shaped unit of the SSPP periodic structure, the total width h1=10mm, the groove depth h2=4mm, the groove width a=2mm, and the total length l4=34 mm of the periodic structure;
the material of the substrate dielectric substrate is F4B, the dielectric constant is 2.65, the magnetic permeability is 1, and the metal material is copper.
Fig. 5 is a graph of the forward transmission coefficients S21 of a simulated straight line and a polynomial sinusoid.
Fig. 6 is a graph of port reflection coefficients S11 for a simulated straight line and a polynomial sinusoid.
Although the present invention has been described with reference to the preferred embodiments, it is not limited thereto, and one skilled in the art can utilize the disclosed method and technology to make possible variations and modifications to the present invention without departing from the spirit and scope of the present invention, such as changing to other transition modes such as fourth order polynomial sine, etc. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present application, which do not depart from the content of the technical solution of the present application, all belong to the protection scope of the technical solution of the present application.
Claims (4)
1. The secondary polynomial sinusoidal transition structure based on SSPP is characterized by comprising a transition slot structure with Vivaldi antenna patches and slot heights changing according to the secondary polynomial sinusoid, and the complete structure further comprises:
a transition groove (2) arranged on the upper surface of the substrate medium substrate (4);
the Vivaldi fan-shaped metal patch (1) is arranged on the upper surface of the substrate dielectric substrate (4);
a periodic SSPP transmission structure (3) disposed on an upper surface of the substrate dielectric substrate (4);
the feed ports on the two sides of the substrate medium substrate (4) are connected with Vivaldi sector metal patches, the middle metal belt is connected with a transition groove structure with quadratic polynomial sine change, and then the transition groove structure is connected with a periodic SSPP transmission structure, and the upper part, the lower part, the left part and the right part are completely symmetrical.
2. The quadratic polynomial sinusoidal transition structure of claim 1, wherein the sector shaped metal patch arcs vary according to Vivaldi antennas and the height of the transition slot structure varies according to quadratic polynomial sinusoids;
the Vivaldi curve is expressed as:
y＝C 1 e αx +C 2 (1-1)
wherein: x is x 1 ＜x＜x 2 Alpha is the curvature of the curve, (x) 1 ,y 1 ) Is the curve starting point, (x) 2 ,y 2 ) Is the end point of the curve, and:
optimization result curvature α=0.15, starting point (0,1.2), end point (19.5,7.2);
a quadratic polynomial sine expression:
a in the formula i ＝1mm，a o Optimized curvature k=0.5, m and n take 2, l is the total transition length 40mm, z is the length variable.
3. The quadratic polynomial sinusoidal transition structure of claim 1, wherein the material of the substrate dielectric substrate is F4B and the metallic material is copper.
4. The quadratic polynomial sinusoidal transition structure of claim 1, wherein:
the length L=114 mm, the thickness d1=1.52 mm and the width w1=20 mm of the substrate medium substrate (4);
upper surface metal thickness d2=0.018 mm, two-sided metal Vivaldi antenna patch width l1=7 mm, length l2=19.5 mm;
the width s=2 mm of the starting point of the middle metal, the distance w 2=9 mm of the edge from the middle metal, and the interval g=0.2 mm between the middle metal and the fan-shaped metal patches on the two sides;
the height of the transition groove structure varies sinusoidally according to a quadratic polynomial, the period length p=6mm of the H-shaped unit of the SSPP periodic structure, the total unit width h1=10mm, the groove depth h2=4mm, the groove width a=2mm, and the total length l4=34 mm of the periodic structure;
the two sides of the upper, lower, left and right structures are completely symmetrical.
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| CN203674385U (en) * | 2013-07-03 | 2014-06-25 | 中国船舶重工集团公司第七二四研究所 | High gain broadband dielectric lens Vivaldi antenna |
| CN105261841A (en) * | 2015-09-16 | 2016-01-20 | 东南大学 | Quasi-surface plasmon-based leaky-wave antenna |
| CN107732383A (en) * | 2017-10-09 | 2018-02-23 | 六盘水师范学院 | A kind of dual-band microwave bandpass filter |
| CN108321519A (en) * | 2018-02-07 | 2018-07-24 | 南京邮电大学 | Bilateral binary cycle surface phasmon leaky-wave antenna |
| CN113032966A (en) * | 2021-03-01 | 2021-06-25 | 浙江大学杭州国际科创中心 | Design method of surface plasmon polariton wave absorber |
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2021
- 2021-11-29 CN CN202111431090.6A patent/CN114069180B/en active Active
Patent Citations (5)
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|---|---|---|---|---|
| CN203674385U (en) * | 2013-07-03 | 2014-06-25 | 中国船舶重工集团公司第七二四研究所 | High gain broadband dielectric lens Vivaldi antenna |
| CN105261841A (en) * | 2015-09-16 | 2016-01-20 | 东南大学 | Quasi-surface plasmon-based leaky-wave antenna |
| CN107732383A (en) * | 2017-10-09 | 2018-02-23 | 六盘水师范学院 | A kind of dual-band microwave bandpass filter |
| CN108321519A (en) * | 2018-02-07 | 2018-07-24 | 南京邮电大学 | Bilateral binary cycle surface phasmon leaky-wave antenna |
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