CN106486754B - A kind of Qie Lunkefu radiation appliance based on artificial surface phasmon - Google Patents
A kind of Qie Lunkefu radiation appliance based on artificial surface phasmon Download PDFInfo
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- CN106486754B CN106486754B CN201610894215.1A CN201610894215A CN106486754B CN 106486754 B CN106486754 B CN 106486754B CN 201610894215 A CN201610894215 A CN 201610894215A CN 106486754 B CN106486754 B CN 106486754B
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- radiation
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- surface phasmon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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Abstract
The Cerenkov radiation device design based on artificial surface phasmon that the invention discloses a kind of.It is made of dielectric layer and the double layer of metal piece for being fixedly connected on dielectric layer two sides；Double layer of metal piece is mirrored into symmetrically along sheet metal extending direction；Radiation appliance is to introduce the phasing back structure in period in the waveguide based on double-layer artificial surface plasmon waveguide structure, thus generates the structural mutation of impedance discontinuity in the structure.The present invention is based on the basis of the waveguide of artificial surface phasmon, and the mode of realization artificial surface phasmon is converted and high efficient radiation, and efficiently controls radiation and the beam position of artificial surface phasmon by changing dispersion characteristics.It can be realized the efficient conversion between conduction mode and space radiation mode by means of the present invention, this will largely promote the development of novel guided wave structure device and function element, and following circuit, signal transmission, in terms of it is with important application prospects.
Description
Technical field
The present invention relates to a kind of Cerenkov radiation devices based on artificial surface phasmon, belong to novel artificial electromagnetism
Material Field.
Background technique
When high speed charged particle is walked in the medium, when particle rapidity is greater than the phase velocity in medium, one can be inspired
Special radiation --- the Cerenkov radiation of kind.This radiation is to be sent out by Russian physicist P.A. Cherenkov for 1934
Existing, nineteen thirty-seven Russia physicist I.M. Frank and I.E. tower nurse successfully explain the origin cause of formation of Cerenkov radiation.Qie Lun
Section husband radiation is a kind of strong polarized radiation, it is formed by radiation field and will focus in the conical area of one, particle rear, this
It is that the charged particle wave that each point is radiated on its motion profile interferes the tail to be formed.Also, the direction of radiated wave with
Angle theta between Particles Moving direction is known as Cherenkov angle, meets cos θ=c/nv, and v is particle rapidity in formula, and n is medium
Refractive index, c are vacuum light speed.
Surface phasmon is one kind in optical band metal-dielectric interface (or metal-Air Interface) height local
The mode of electromagnetic wave of transmission, it is in the neck such as antireflection, super-resolution imaging, the data storage of sub-wavelength structure, near field optic
Domain is widely used.Traditional surface phasmon is studied in optical band, by means of the general of Novel manual electromagnetic material
Read --- by the modes such as metal surface borehole or cutting, people's (microwave or terahertz wave band) success at lower frequency bands
Surface phasmon is simulated in the property of optical band, and this special structure is called artificial surface phasmon.Cause
This, artificial surface phasmon is by one kind of the concept of surface phasmon to low-frequency range (microwave or terahertz wave band)
Using, and it helps to reduce device size in sub-wavelength magnitude.The artificial surface phasmon of microwave frequency band is guided wave structure
The similar transmission characteristic of surface phasmon with traditional optical band, and can be adjusted by the geometric parameter of adjustment structure
Control its electromagnetic property.
Surface phasmon is a kind of surface wave mode of constraint, and undulate quantity is greater than the momentum of free photon, therefore very
Hardly possible is directly directly translated into spatial electromagnetic wave with surface phasmon.According to optics principle of reciprocity, especially design surface etc. from
When excimer function element, the efficient conversion of space wave and surface phasmon wave is a very crucial technological difficulties；Due to
Current lower transformation efficiency, which greatly limits the development and application of surface phasmon device.Therefore, urgently
It needs to find a kind of approach, can be realized the efficient conversion between transmission mode and radiation mode.Also, it is ground by what mode was converted
Some new coupling mechanisms may be brought by studying carefully, and can largely promote novel guided wave structure device and function element
Development.The present invention is based on the microwave frequency bands with mature processing technology and test platform, and based on artificial surface etc. from sharp
The research of the coherent radiation characteristic of first waveguide, it will mode between the following optical band and terahertz wave band phasmon device is converted
Research do beneficial reference.
Summary of the invention
The technical problems to be solved by the invention: providing a kind of radiation appliance based on artificial surface phasmon waveguide,
Artificial surface phasmon mode effectively can be converted into radiation mode by the waveguiding structure, and simulation Qie Lunkefu radiates tail
Mark.Device has many advantages, such as that structure is simple, low section, and beam position and beam angle are easy to regulate and control, convenient production and integrated,
Practical value with higher.
To achieve the above object, the present invention adopts the following technical scheme that realize:
A kind of Qie Lunkefu radiation appliance based on artificial surface phasmon, including medium substrate and being covered on are given an account of
The double layer of metal piece of matter substrate upper and lower surfaces；Two layers of sheet metal is along sheet metal extending direction mirror symmetry；The metal
Piece is made of inversion structures along sheet metal extending direction periodic arrangement；The inversion structures are led to by mutual antisymmetric metal structure
Overmatching stub is formed by connecting；The metal structure is made of metal groove unit periodic arrangement.
Transition structure is equipped at two layers of sheet metal both ends；The transition structure be depth of groove along end inwardly by
Gradually deepen the periodical metal groove structure until equal with the inversion structures depth of groove.
The groove of the metal groove unit is rectangular element wide at equal intervals.
The width of the matching stub is a quarter of wavelength.
The dispersion characteristics and cut-off of described device are adjusted by the range difference changed between two layers of sheet metal transverse center
Frequency.
The utility model has the advantages that compared with prior art, the invention has the following advantages:
1. structure of the invention is two-dimension plane structure, production is simple, convenient for integrated.In microwave band, there is mature PCB
Processing technology and measuring technique are capable of the processing and test of finishing device material object.
2. the one kind of the invention that mainly proposes is based on artificial surface phasmon guided wave radiation appliance, two of device are main
Function: the excitation of the guided wave of input terminal to artificial surface phasmon and artificial surface phasmon turn to space radiation mode
Change.The design of this structure is the dispersion characteristics based on unit groove, using the radiation areas concept of Brillouin diagram, by tying
Higher mode has been motivated to radiate at structure mutation.The co-planar designs of input terminal, thus in the design of device and integrated circuit have compared with
Big flexibility.
3. the radiation that the present invention can change device by changing the geometric dimension of artificial electromagnetic surface cell structure is special
Property.It adjusts simply, scalability is good.Because structure is that reduce its using the resonance effect of metal unit structure equivalent on the whole
Body phase plasma resonance frequency therefore by adjusting metal structure and periodic dimensions, become plasma resonant vibration frequency
Change, to change its dispersion characteristics.
4. the size of device can be effectively reduced by the coupling between upper and lower layer medium.Because of its surface plasma frequency
Rate is further decreased compared with the prior art, so as to further decrease ruler so that secondly wavelength and field local effect significantly increase
It is very little.This more traditional guided wave mode of mode has smaller equivalent waveguide wavelength, this property can be used for constructing miniaturization
Device.
5. the irradiation structure can realize the signal and surface phasmon mould of micro-strip transmission in wider working band
The efficient conversion of the signal of formula.Also, the scanning angle of wave beam changes with frequency, the angle of radiation characteristic with Qie Lunkefu.
Detailed description of the invention
Fig. 1 is the three dimensional structure diagram of radiation appliance in the present invention；1 is medium substrate, and 2 be the first sheet metal, and 3 be the
Two sheet metals, artificial electromagnetic surface cell corresponding equivalent impedance circuit of 4 bottom-right graphs for a cycle, 5 matching stubs, 6
Upper left illustration is corresponding structural side view；Wherein, a is the width of groove, and h is the depth of groove, and p is the period of chase unit
Width.
Fig. 2 is the positive and negative structure of processing pictorial diagram of the invention.
Fig. 3 is Qie Lunkefu radiation theory schematic diagram of the invention.
Fig. 4 is that the range difference g between 3 transverse center of the first sheet metal 2 and the second sheet metal of double-level-metal band corresponds to
The dispersion relation curve of different value, the variation range of g is from 6mm to 0mm；The linear solid line of black is the corresponding dispersion relation of light.
Fig. 5 is the theory curve of dispersion characteristics in the present invention.The linear solid line of black is the dispersion curve of light, is clipped in two
Shadow region between solid black lines is radiation areas.
The Electric Field Simulation figure of Fig. 6 radiation appliance of the present invention, when the range difference between upper/lower layer metallic piece transverse center is g=0
When, the electric field intensity distribution map at section.
The Electric Field Simulation figure of Fig. 7 radiation appliance of the present invention, when the range difference between upper/lower layer metallic piece transverse center is g=0
When, the electric field intensity distribution map at section.
Fig. 8 is near field Electric Field Simulation figure of the present invention on XOY plane.(figure (a)-(d) corresponds respectively to 4 different frequencies
Point 12GHz, 12.7GHz, 15.2GHz, 15.8GHz, from the figure, it can be seen that the deflection direction of radiation beam meets equation: θc
(w)=sin-1[c/nvp)]=sin-1[cβ(w)/w]。
Fig. 9 is the port parameter curve graph of device in the present invention.
Figure 10 is to calculate the leakage factor figure for acquiring corresponding each frequency point, is calculated by the S parameter of structure in the measurement present invention
Acquire the leakage factor figure of corresponding each frequency point.
Specific embodiment
With reference to the accompanying drawing, technical solution of the present invention is described in detail.
Fig. 1 gives the overall structure diagram and its schematic cross-section 6 of phasing back device.Whole device can be seen
Work is made of multiple parallel transmission line section series connections.As shown in Figure 1, structure of the invention includes medium substrate 1 and covers
Cover the double layer of metal piece in 1 upper and lower surfaces of medium substrate.The structure of double layer of metal piece is extended by metal groove unit along sheet metal
Direction periodic arrangement is constituted, upper and lower layer sheet metal metallic pattern having the same, and relative to reference planes (XOZ plane)
Mirror symmetry, the slot opening on slot opening direction and the second sheet metal 3 on the first sheet metal 2 are contrary.
Feed-in mode in coaxial waveguide port is TEM mode, the TM mould supported with artificial surface phasmon waveguiding structure
There are mode mismatch between formula, consider that impedance is matched with wave vector between artificial surface phasmon waveguide impedance and feed side waveguide
In the case where, it needs to increase by one section of gradual transition structure matching at the both ends of Fig. 2 structure.With the changeover portion knot of gradual change groove
Structure can have effectively achieved metal grating structure to the conversion between artificial surface electromagnetic unit.It is located at gold in total
Belong to piece both ends depth of groove respectively along from end to centre gradually deepen, until and the groove in the middle part of sheet metal depth
It spends equal.Effective excitation that artificial surface phasmon is realized by gradually deepening depth of groove structure in sheet metal both ends, will be defeated
The guided wave mode successful conversion for entering end is artificial surface plasmon mode.
Groove on the sheet metal of artificial surface phasmon guided wave is rectangular element wide at equal intervals, and forms the period
Property inversion structures, the formation of inversion structures be by original unilateral periodical metal structure every length be T/2 by metal knot
Structure is formed along y=g/2 axis mirror symmetry, is connected between mirror image unit and adjacent unit by the matching stub 5 that width is d
It connects, i.e., inversion structures are formed by connecting by mutual antisymmetric metal structure by matching stub 5；Wherein, T is the period, and g is upper
Range difference between lower metal piece transverse center, for perpendicular on sheet metal extending direction between upper/lower layer metallic piece center away from
From.The lateral distance that the coefficient of coup of interlayer depends between transmission line section is poor, i.e., in the upper/lower layer metallic piece transverse direction of transmission line section
Range difference g in the heart causes two ribbon feeder segment structures that the length of arbitrary neighborhood is T/2 to correspond to different g by reversion
Value.In figure, neighboring transmission line segment respectively corresponds g=0 and g=6mm.Two different equivalent characteristic impedances will be will form in this way as schemed
Z shown in 6 in 101And Z02, this will introduce change in the instantaneous impedance due to impedance discontinuity in structural attachments.Therefore, cutting back is matched
Line 5 generallys use a quarter of wavelength, forms effective ground resistance resistance between impedance and changes inhibition local reflex.Matching stub 5
It can also be considered to be between the half-wavelength parallel segment of two different characteristics impedance values and connect a quarter-wave impedance
Transforming section.
In the present invention, the thickness t=0.17mm of dielectric-slab, the dielectric constant of dielectric-slab are 2.65.The width a=of groove
0.6mm, the depth h=1.2mm of groove, the periodic width p=1.5mm of chase unit connect metal band width d=
0.45mm。
The working principle of Qie Lunkefu radiation appliance proposed by the invention is as follows:
In no inversion structures incorporated in the present invention, transmission line is one topological along sheet metal extending direction by unit
The artificial surface phasmon waveguiding structure of arrangement, it is a kind of guided wave (radiationless) structure of constraint.In the reason of dispersion characteristics
By in curve graph 5, it can be seen that double-level-metal chip architecture of the invention has a kind of slow wave dispersion for tending to certain frequency cutoff special
Property.This characteristic makes between the upper and lower layer sheet metal of structure there is stronger electromagnetic coupling to have compared to traditional microstrip line
It is higher bound to reduce mutual crosstalk.Also, corresponding to different laterally away from poor g, the dispersion curve of parallel groove
It is all located at outside the first Brillouin light region, therefore structure itself is a kind of non-radiative mode.The people motivated in this configuration
Work surface phasmon is a kind of only surface wave in period direction for communication mode, is showed on other two orthogonal direction
For the surface plasmon mode of natural Exponents decaying.The performance of its dispersion behavior is analogous to optical region lower surface phasmon
Dispersion properties.When frequency close to structure when frequency, show more significant field containment and sub-wavelength characteristic.It adopts
There is very strong field local effect with the artificial surface phasmon waveguide of antisymmetric pectinate texture, so that the waveguide has
Higher anti-interference, such conducting structure have potential application prospect in high speed circuit.
It is entirely guided wave structure to become using length T as the new construction in period after introducing phasing back structure in the waveguide.Root
According to Floquet theorem, periodic structure can generate higher hamonic wave, and the dispersion relation between them meets:
βn(w)=± [β0(w)+2 π n/p], n=0, ± 1, ± 2... (1)
Also, due to the cellular construction reversion adjacent thereto of the unit of each T/2 length, lead to phasing back (phase difference
Half period) so that making dispersion curve along horizontal direction to left π.In this way, as shown in figure 5, higher mode (- 1 mould)
Dispersion curve forms radiation just past a Brillouin light regions, the wave of the mode.
Fig. 2 is processing pictorial diagram of the invention, as shown in Fig. 2, upper figure is the front view of upper layer sheet metal, the following figure is lower layer
The front view of sheet metal.
Qie Lunkefu radiation theory schematic diagram Fig. 3 of the invention, as shown in figure 3, the motion profile of radiation is in the direction of propagation
Rear is in cone, this is the tail that wave interferes that superposition is formed in communication process, and cone angle meets Cherenkov's spoke
The angle equation penetrated.
Fig. 4 is that the range difference between 3 transverse center of the first sheet metal 2 and the second sheet metal of double-level-metal band corresponds to not
With the dispersion relation curve graph of g.As shown in figure 4, by change between the first sheet metal 2 and 3 transverse center of the second sheet metal away from
Deviation g, the dispersion characteristics and cutoff frequency of adjustable structural unit.We compare from Fig. 4, the dispersion curve of double-layer structure
Compared with single layer ribbon structure further off in the dispersion curve of light, it means that double-layer structure for electromagnetic field Local Characteristic more
By force.
Fig. 5 is the theory curve of dispersion characteristics in the present invention.As shown in figure 5, full by the dispersion curve in the region
Sufficient radiation condition belongs to fast wave radiation.N=-1 dispersion curve is that n=0 dispersion curve is acquired according to formula (1).Due to
Phasing back structure, the corresponding curve of the dispersion curve (dotted line) of structure of the invention indicate to incite somebody to action -1 curve to one phase of left
Position π.Meanwhile the curve that it is fitted with the triangle point calculated by angle equation almost coincide.A, B, C points in figure
It Wei not be with the dispersed lines of light in figure and the intersection point of vertical coordinate.
Fig. 9 is the port parameter curve graph of device in the present invention.As shown in figure 9, in 12-16GHz frequency range, reflection
Coefficient S 11 is less than -10dB, and S21 is less than -30dB, shows that the device most energy in working band are radiated
It goes.
The above is only the preferred embodiments of the invention.It is noted that, for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (5)
1. a kind of Qie Lunkefu radiation appliance based on artificial surface phasmon, it is characterised in that: including medium substrate (1) and
It is respectively overlay in one layer of sheet metal of the medium substrate (1) upper and lower surfaces；The sheet metal is along the medium substrate (1)
Extending direction mirror symmetry；The sheet metal is made of inversion structures along the medium substrate (1) extending direction periodic arrangement；Institute
It states inversion structures to be made of mutual antisymmetric metal structure, the mutually antisymmetric metal structure passes through matching stub
(5) it connects；The metal structure is made of metal groove unit periodic arrangement.
2. Qie Lunkefu radiation appliance according to claim 1, it is characterised in that: be equipped with transition at the sheet metal both ends
Structure；The transition structure is that depth of groove is inwardly gradually deepened until equal with the inversion structures depth of groove along end
Metal groove structure.
3. Qie Lunkefu radiation appliance according to claim 1, it is characterised in that: the groove of the metal groove unit is
Wide rectangular element at equal intervals.
4. Qie Lunkefu radiation appliance according to claim 1, it is characterised in that: the width of the matching stub (5)
For a quarter of wavelength.
5. Qie Lunkefu radiation appliance according to claim 1, it is characterised in that: by changing in the sheet metal transverse direction
Range difference in the heart adjusts the dispersion characteristics and cutoff frequency of described device.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108572490B (en) * | 2017-03-13 | 2020-04-17 | 中国科学技术大学 | Device and method for generating reverse Cerenkov radiation |
| CN111129685B (en) * | 2019-12-31 | 2021-03-19 | 东南大学 | Artificial plasmon resonator with deep subwavelength and high quality factor |
| CN113964540B (en) * | 2021-10-27 | 2022-09-30 | 南京航空航天大学 | Device and method for regulating and controlling moire effect artificial surface plasmon dispersion |
| CN116031600B (en) * | 2023-02-21 | 2024-04-16 | 西安电子科技大学 | Stop band suppression structure based on impedance matching artificial surface plasmon |
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