CN111180844A - Excitation and transmission device of artificial surface plasmon high-order mode - Google Patents
Excitation and transmission device of artificial surface plasmon high-order mode Download PDFInfo
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- CN111180844A CN111180844A CN202010008327.9A CN202010008327A CN111180844A CN 111180844 A CN111180844 A CN 111180844A CN 202010008327 A CN202010008327 A CN 202010008327A CN 111180844 A CN111180844 A CN 111180844A
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- surface plasmon
- coplanar waveguide
- artificial surface
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- transmission line
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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
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Abstract
An excitation and transmission device of an artificial surface plasmon high-order mode comprises a dielectric substrate and metal copper foils positioned on the upper surface and the lower surface of the dielectric substrate, wherein a micro-strip feeder (1) made of the metal copper foils is arranged on the lower surface of a dielectric substrate (7) and is connected with a metal coupling sheet (2), and a coplanar waveguide feeder (4), a matching structure (5) and an artificial surface plasmon transmission line (6) made of the metal copper foils are arranged on the upper surface; the ground made of metal copper foils is symmetrically arranged on two sides of the coplanar waveguide feeder (4); the excitation and transmission device is bilaterally symmetrical, an artificial surface plasmon transmission line (6) is arranged in the middle, matching structures (5) are arranged on two sides of the artificial surface plasmon transmission line (6), and a front hole (3) is arranged outside the matching structures (5); the artificial surface plasmon transmission line (6) extends to the hole (3) of the front surface through the coplanar waveguide feeder (4) positioned in the matching structure (5), and the device is simple in design and processing.
Description
Technical Field
The invention relates to an excitation and transmission technology of an artificial surface plasmon high-order mode, and belongs to the technical field of microwave transmission line design.
Background
Surface plasmons refer to surface waves propagating on the surface of a metal or a medium, and are generated by resonance between electromagnetic waves and free electrons on the surface of the metal. The surface plasmon has the characteristics of field enhancement, field constraint and the like, so the surface plasmon has good application prospects in the aspects of sensing, detection, imaging and the like. But limited by the metal plasma frequency, these characteristics mainly work at optical frequencies as well as in the near infrared band. At low frequencies, such as terahertz and microwave bands, surface plasmons cannot be generated. In order to obtain surface waves with similar characteristics at low frequencies, periodic perforations, grooves and corrugations are made in the metal surface. Surface waves can propagate on these structures, and the dispersion characteristics are similar to surface plasmons at optical frequencies, and are therefore referred to as artificial surface plasmons. The regulation and control of the dispersion characteristic of the artificial surface plasmon polariton can be realized by changing the size of the metal structure. The existing artificial surface plasmon waveguide works in a fundamental mode and is excited by an even mode of a coplanar waveguide transmission line, namely, a traditional coplanar waveguide mode.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide an excitation and transmission device of an artificial surface plasmon high-order mode, wherein a transmission line of the device works in a first-order high-order mode, so that the working frequency band and the working mode of the artificial surface plasmon are expanded.
The technical scheme is as follows: the invention relates to an excitation and transmission device of an artificial surface plasmon high-order mode, which comprises a dielectric substrate and metal copper foils positioned on the upper surface and the lower surface of the dielectric substrate, wherein a micro-strip feeder made of the metal copper foils is arranged on the lower surface of the dielectric substrate and connected with a metal coupling piece, and a coplanar waveguide, a matching structure and an artificial surface plasmon transmission line made of the metal copper foils are arranged on the upper surface; the two sides of the coplanar waveguide are symmetrically provided with grounds made of metal copper foils; the excitation and transmission device is bilaterally symmetrical, an artificial surface plasmon transmission line is arranged in the middle, matching structures are arranged on two sides of the artificial surface plasmon transmission line, and a front hole is arranged outside the matching structures; the artificial surface plasmon transmission line extends through a coplanar waveguide located in the matching structure to the aperture of the front face.
The odd-mode of the coplanar waveguide generated by the coplanar waveguide feeder line can efficiently excite a first-order higher-order mode of the artificial surface plasmon on the artificial surface plasmon transmission line and cannot excite a basic mode of the artificial surface plasmon.
The metal coupling sheet and the hole on the front surface can only excite the odd mode of the coplanar waveguide at the coplanar waveguide feeder line, but can not excite the even mode of the coplanar waveguide.
The metal coupling sheet and the hole on the front side realize efficient broadband transition from the microstrip transmission line to the odd-mode of the coplanar waveguide feeder; the sizes of the metal coupling sheet and the hole on the front surface are changed, and the working frequency of the transition structure is changed, so that the working frequency of the device is changed.
The transition structure is a coplanar waveguide with the ground surfaces on the two sides gradually opened, and a groove structure with gradually changed depth is added on the middle strip of the coplanar waveguide, so that the transition from the coplanar waveguide to an artificial surface plasmon high-order mode is realized.
Has the advantages that: the invention has band-pass characteristic and steeper rising edge and falling edge.
The invention can realize the convenient regulation and control of the electromagnetic wave by changing the depth of the groove on the metal strip and the length of the period, thereby changing the working frequency band of the device.
The invention is realized by adopting a common single-layer PCB process, and has simple design and processing. The feed of the invention is carried out by the microstrip line, can be used for designing various microwave millimeter wave filters, power dividers, couplers and various active circuits, and can be conveniently integrated into an antenna, a chip and a communication system.
The invention can adopt the flexible medium substrate to realize conformal transmission of the artificial surface plasmon.
The design idea of the invention can be applied to transmission of the terahertz frequency band artificial surface plasmon.
Drawings
FIG. 1 is a general schematic view of one embodiment of the present invention;
FIG. 2 is a graph of simulation results of reflection coefficient versus propagation coefficient for a specific structure of the present invention;
the figure shows that: the device comprises a microstrip feeder line 1, a metal coupling sheet 2, a hole 3 on the front surface, a coplanar waveguide feeder line 4, a matching structure 5, an artificial surface plasmon transmission line 6 and a dielectric substrate 7.
Detailed Description
The invention is designed based on a coplanar waveguide odd-mode feed structure and an artificial surface plasmon transmission line. The coplanar waveguide odd-mode feed part consists of a microstrip transmission line and a transition structure, and a metal coupling sheet at the tail end of the microstrip transmission line and a metal hole at the starting position of the coplanar waveguide can transition electromagnetic waves from a microstrip mode to a coplanar waveguide odd-mode and realize the impedance matching performance of a broadband.
The artificial surface plasmon transmission line adopts a mode of periodically digging grooves on the metal strip, and the working frequency band can be changed by changing the depth and the period length of the grooves, so that the regulation and control of electromagnetic waves are realized.
The odd mode excitation on the coplanar waveguide starts the high-order mode of the artificial surface plasmon and cannot excite the basic mode of the artificial surface plasmon.
The method is realized by adopting a common single-layer PCB process, and is simple in design and processing.
The present invention will be described in more detail with reference to the accompanying drawings and examples.
The invention relates to an artificial surface plasmon high-order mode transmission line, the overall structure schematic diagram of which is shown in figure 1, the device comprises a medium substrate and metal copper foils positioned on the upper surface and the lower surface of the medium substrate, a micro-strip feeder 1 made of the metal copper foils is arranged on the lower surface of a medium substrate 7 and connected with a metal coupling sheet 2, and a coplanar waveguide feeder 4 made of the metal copper foils, a matching structure 5 and an artificial surface plasmon transmission line 6 are arranged on the upper surface; the ground made of metal copper foil is symmetrically arranged on two sides of the coplanar waveguide feeder 4; the excitation and transmission device is bilaterally symmetrical, an artificial surface plasmon transmission line 6 is arranged in the middle, matching structures 5 are arranged on two sides of the artificial surface plasmon transmission line 6, and a front hole 3 is arranged outside the matching structures 5; the artificial surface plasmon transmission line 6 extends through the coplanar waveguide feed 4 in the matching structure 5 to the aperture 3 of the front face.
The coplanar waveguide feeder 4 is connected to an artificial surface plasmon transmission line 6 through a matching structure 5; and the microstrip feed line 1 generates an odd mode at the coplanar waveguide feed line 4 through the circular metal coupling piece 2. The odd mode at the coplanar waveguide feeder 4 excites the high-order mode of the artificial surface plasmon and transmits the high-order mode on the artificial surface plasmon transmission line 6 with the metal strip slotted structure. The entire structure is integrally printed on the dielectric substrate 7.
In an optional example of the present invention, the transition structure 5 is a coplanar waveguide whose two sides are gradually opened and a structure whose metal strip groove depth is gradually changed, and realizes the transition from the coplanar waveguide to the artificial surface plasmon transmission line.
In an optional example of the invention, the metal coupling sheet 2 at the tail end of the microstrip feeder 1 and the metal round hole 3 at the initial position of the coplanar waveguide can transition electromagnetic waves from a microstrip mode to an odd mode of the coplanar waveguide, and cannot excite an even mode of the coplanar waveguide.
In an alternative example of the present invention, the odd mode excitation of the coplanar waveguide initiates a higher order mode of the artificial surface plasmon and fails to excite a fundamental mode of the artificial surface plasmon.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (5)
1. An excitation and transmission device of an artificial surface plasmon high-order mode is characterized by comprising a dielectric substrate and metal copper foils positioned on the upper surface and the lower surface of the dielectric substrate, wherein a micro-strip feeder (1) made of the metal copper foils is arranged on the lower surface of a dielectric substrate (7) and is connected with a metal coupling sheet (2), and a coplanar waveguide feeder (4), a matching structure (5) and an artificial surface plasmon transmission line (6) made of the metal copper foils are arranged on the upper surface of the dielectric substrate; the ground made of metal copper foils is symmetrically arranged on two sides of the coplanar waveguide feeder (4); the excitation and transmission device is bilaterally symmetrical, an artificial surface plasmon transmission line (6) is arranged in the middle, matching structures (5) are arranged on two sides of the artificial surface plasmon transmission line (6), and a front hole (3) is arranged outside the matching structures (5); the artificial surface plasmon transmission line (6) extends through a coplanar waveguide feed line (4) located in the matching structure (5) to the aperture (3) of the front face.
2. The excitation and transmission apparatus of artificial surface plasmon higher order mode according to claim 1, characterized in that the coplanar waveguide odd mode generated by the coplanar waveguide feed line (4) can efficiently excite the first order higher order mode of artificial surface plasmon on the artificial surface plasmon transmission line (6) and cannot excite the fundamental mode of artificial surface plasmon.
3. The excitation and transmission device of the artificial surface plasmon higher order mode according to claim 1, characterized in that the metal coupling plate (2) and the front hole (3) can excite only the odd mode of the coplanar waveguide at the coplanar waveguide feed line (4) and can not excite the even mode of the coplanar waveguide.
4. The excitation and transmission device of the artificial surface plasmon higher order mode according to claim 2, characterized in that the metal coupling sheet (2) and the hole (3) on the front side realize the efficient broadband transition from the microstrip transmission line (1) to the odd mode of the coplanar waveguide feeder (4); the sizes of the metal coupling sheet (2) and the hole (3) on the front surface are changed, and the working frequency of the transition structure is changed, so that the working frequency of the device is changed.
5. The excitation and transmission device of the artificial surface plasmon high-order mode according to claim 1, characterized in that the transition structure (5) is a coplanar waveguide with two sides of the ground gradually opened, and a groove structure with gradually changed depth is added on the middle strip of the coplanar waveguide, so that the transition from the coplanar waveguide to the artificial surface plasmon high-order mode is realized.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010008327.9A CN111180844B (en) | 2020-01-06 | 2020-01-06 | Excitation and transmission device of artificial surface plasmon high-order mode |
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| CN202010008327.9A CN111180844B (en) | 2020-01-06 | 2020-01-06 | Excitation and transmission device of artificial surface plasmon high-order mode |
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| CN111180844B CN111180844B (en) | 2021-07-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113058668A (en) * | 2021-03-20 | 2021-07-02 | 山东大学 | Artificial surface plasmon micro-fluidic detection chip structure based on capacitive metamaterial structure and preparation and detection methods thereof |
| CN117498045A (en) * | 2024-01-03 | 2024-02-02 | 延安大学 | High-gain high-isolation filter antenna for informatization management and array thereof |
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| US20130301983A1 (en) * | 2012-05-08 | 2013-11-14 | Pinaki Mazumder | Dynamic Terahertz Switching Device Comprising Sub-wavelength Corrugated Waveguides and Cavity that Utilizes Resonance and Absorption for Attaining On and Off states |
| CN104852119A (en) * | 2015-04-07 | 2015-08-19 | 上海大学 | Compact broadband slow wave system based on double curved-groove metal grating structures |
| CN105547337A (en) * | 2015-12-23 | 2016-05-04 | 上海大学 | MIM annular notch groove structure sensor |
| CN105703047A (en) * | 2016-03-28 | 2016-06-22 | 东南大学 | Artificial surface plasmon-based low-loss transmission line |
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2020
- 2020-01-06 CN CN202010008327.9A patent/CN111180844B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130301983A1 (en) * | 2012-05-08 | 2013-11-14 | Pinaki Mazumder | Dynamic Terahertz Switching Device Comprising Sub-wavelength Corrugated Waveguides and Cavity that Utilizes Resonance and Absorption for Attaining On and Off states |
| CN104852119A (en) * | 2015-04-07 | 2015-08-19 | 上海大学 | Compact broadband slow wave system based on double curved-groove metal grating structures |
| CN105547337A (en) * | 2015-12-23 | 2016-05-04 | 上海大学 | MIM annular notch groove structure sensor |
| CN105703047A (en) * | 2016-03-28 | 2016-06-22 | 东南大学 | Artificial surface plasmon-based low-loss transmission line |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113058668A (en) * | 2021-03-20 | 2021-07-02 | 山东大学 | Artificial surface plasmon micro-fluidic detection chip structure based on capacitive metamaterial structure and preparation and detection methods thereof |
| CN113058668B (en) * | 2021-03-20 | 2022-05-27 | 山东大学 | Artificial surface plasmon micro-fluidic detection chip structure based on capacitive metamaterial structure and preparation and detection methods thereof |
| CN117498045A (en) * | 2024-01-03 | 2024-02-02 | 延安大学 | High-gain high-isolation filter antenna for informatization management and array thereof |
| CN117498045B (en) * | 2024-01-03 | 2024-04-16 | 延安大学 | High-gain high-isolation filter antenna for informatization management and array thereof |
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| CN111180844B (en) | 2021-07-09 |
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