Artificial surface plasmon transmission line based on fractal branch structure and its application thereof

An artificial surface plasma and transmission line technology, applied in electrical components, waveguides, circuits, etc., can solve the problems of limited integrated circuit application and large size, and achieve the effect of strong electromagnetic wave restraint performance, small structure size, and excellent transmission characteristics.

Pending Publication Date: 2019-12-17
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of plasmonic waveguide often has a three-dimensional str

Method used

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  • Artificial surface plasmon transmission line based on fractal branch structure and its application thereof
  • Artificial surface plasmon transmission line based on fractal branch structure and its application thereof
  • Artificial surface plasmon transmission line based on fractal branch structure and its application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

[0028] Such as figure 1 As shown, the artificial surface plasmon transmission line includes a microstrip line 1 with periodic fractal stubs 2 arranged on the central strip of the microstrip line, and the periodic fractal stubs 2 are distributed on one side of the central strip of the microstrip line.

[0029] In this embodiment, the dielectric substrate material of the microstrip line is Rogers RT5880, the dielectric constant is 2.2, the thickness is 0.508 mm, and the transmission loss angle is 0.0009; the material of the metal thin film transmission line and periodic fractal branches is selected as copper.

[0030] The structure of each periodic unit of the artificial surface plasmon transmission line is as figure 2 As shown, they are the morphologies of the fractal branches of the periodic unit structure after different iterations. The size is selected as: w=25mm, p=7.5mm, a=5.4mm, d r =a-r(r=0,1,2,3), where w represents the width of the substrate, p represents t...

Example Embodiment

[0032] Example 2

[0033] Such as Figure 4 As shown, embodiment 2 is an artificial surface plasmon transmission line designed based on embodiment 1, including a microstrip line 1. The central strip of the microstrip line is provided with periodic fractal stubs 2, and the periodic fractal stubs 2 are distributed On both sides of the center strip of the microstrip line;

[0034] Specifically, the two ends of the artificial surface plasmon transmission line are microstrip feed ends, and the microstrip line width w 1 =1.54mm, ensure the port impedance of 50Ω, design a 6-period transition structure through a and r to achieve impedance matching. The parameters are designed as follows: the first transition period is 3, r=2, a=4.9mm; the second transition Period 4, r=2, a=3.9mm; third transition period 5, r=1, a=3.2mm; fourth transition period 6, r=1, a=2.4mm; fifth transition period 7 , R=0, a=1.4mm; the sixth transition period 8, r=0, a=1.2mm; other main parameters are as follows: micr...

Example Embodiment

[0036] Example 3

[0037] Such as Image 6 As shown, Embodiment 3 is a power divider designed based on Embodiment 2. The power divider is mainly composed of a straight waveguide 9 and two curved waveguides 10, wherein the straight waveguide 9 is divided into two at the bifurcation part 11. They are rotated by α=30° for 4 cycles to form two curved waveguides 10, and a 100Ω resistor 12 is loaded at β=15° in the middle 2 cycles. The power divider also includes three ports, namely port one, 14, Port two 15 and port three 16, in which port two 15 and port three 16 are respectively connected to the transition section 13 of the microstrip and curved waveguide, the parameter setting is: port microstrip line width w 1 =1.54mm, microstrip line width w in curved waveguide 0 =0.77mm, realize impedance matching, other main parameters are as follows: substrate width w 2 =60mm, the length of the gradual change section l 5 =10mm, total length of power divider l 4 = 214.8mm. by Figure 7~8 The S...

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Abstract

The invention relates to an artificial surface plasmon transmission line based on a fractal branch structure and an application thereof, and belongs to the technical field of waveguides and transmission lines. The artificial surface plasmon transmission line comprises a guided wave structure. Periodic fractal branches are arranged on the guided wave structure. The periodic fractal branches are distributed on one side or two sides of the guided wave structure. The periodic fractal branches adopt at least one of cross fractal, Cantor shape, T shape, Minkowski shape, Koch shape, Moore curve shapeand Sierpinski shape. The guided wave structure adopts at least one of a microstrip line, a coplanar waveguide, a stripline, a slot line, a fin line and a single conductor transmission line. The artificial design is convenient and flexible. The artificial surface plasmon transmission line can be used for single-channel or multi-channel transmission of artificial surface plasmon electromagnetic waves in microwave, millimeter wave or terahertz band through scale transformation, amplification and reduction of the structural size of branch units and iteration times, and the artificial surface plasmon transmission line has important application prospects in microwave, millimeter wave and terahertz circuits, devices and systems.

Description

technical field [0001] The invention relates to the field of waveguide and transmission line technology, in particular to an artificial surface plasmon transmission line based on a fractal branch structure and its application. Background technique [0002] With the development of information technology, the miniaturization requirements of microwave and millimeter wave transmission lines are getting higher and higher, which is also the key to the miniaturization and integration of actual microwave and millimeter wave integrated circuits and systems. Surface plasmons (SPPs) are a special kind of surface electromagnetic waves that originate from the collective oscillation of electrons at the interface of two materials with opposite permittivity. In the direction perpendicular to the interface, the SPPs decay exponentially, and at the interface, the SPPs have a strong binding local field. Based on this highly localized property, SPPs can overcome the diffraction limit and can b...

Claims

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Application Information

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IPC IPC(8): H01P3/08
CPCH01P3/10
Inventor 叶龙芳陈瑶柳清伙李伟文陈焕阳
Owner XIAMEN UNIV
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