CN103985944B - A kind of coaxial waveguide is to artificial surface plasma waveguide transducer - Google Patents
A kind of coaxial waveguide is to artificial surface plasma waveguide transducer Download PDFInfo
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- CN103985944B CN103985944B CN201410207024.4A CN201410207024A CN103985944B CN 103985944 B CN103985944 B CN 103985944B CN 201410207024 A CN201410207024 A CN 201410207024A CN 103985944 B CN103985944 B CN 103985944B
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Abstract
The invention provides a kind of coaxial waveguide to artificial surface plasma waveguide transducer, comprise the coaxial waveguide of two ends symmetry, the transition waceguide of coaxial waveguide to artificial surface plasma waveguide and the artificial surface plasma waveguide of centre; Wherein, transition waceguide comprises inner wire and outer conductor transition, and the periodicity ring groove array that inner conductor transition is increased progressively by the degree of depth realizes, and outer conductor transition becomes large horn antenna gradually by opening and realizes; Artificial surface plasma waveguide is made up of the periodicity ring groove array of constant depth.The present invention has open symmetrical structure, compact dimensions, broadband, high-transmission efficiency, structure simply, easily mates with traditional microwave transmission line series of advantages such as using.
Description
Technical field
The present invention relates to a kind of waveguide switch structure, particularly relate to a kind of coaxial waveguide to artificial surface plasma waveguide converter structure.
Background technology
Surface plasmons (SurfacePlasmonPolaritons, be called for short SPPs) is a kind of mode of electromagnetic wave caused under the free electron of light and metal surface interacts.In this interaction, there is collective oscillation in free electron under the irradiation of the light wave identical with its resonance frequency, and it is confined near metal and medium interface, propagates along surface.Plasma frequency due to metal is general all at ultraviolet band, and in microwave section, electromagnetic wave is difficult to infiltration, and metal approximation behavior is perfact conductor (PEC).In these cases, although SPPs can be propagated in principle in metal surface, its constraint of field in medium is very poor.In recent years, someone proposes method in metal surface borehole or cutting to increase electromagnetic field in intrametallic penetrating power, thus can carry out engineering design at lower frequency to SPPs.This plasma frequency is called as artificial surface plasma (SpoofSurfacePlasmonPolaritons by the surface plasma that surface geometry controls, be called for short SSPPs), first it proposed in 2004 by people such as Pendry, and be applied to and carry out engineering design at lower frequency to SPPs.Its basic thought is the hole digging period profile in metal surface, and size and the interval of hole are all less than wavelength, to strengthen electromagnetic osmosis, thus reduces the plasma frequency of metal surface by the means of effective medium.2005, the people such as Hibbins confirmed SSPPs phenomenon in microwave section, and SSPPs causes the great interest of researcher since then.
In general, metal is approximately perfact conductor in low-frequency range (microwave section), therefore can not SPPs be propagated on its surface, but after having had the hole of period profile, SPPs not only can be propagated in surface, can also realize the sub-wavelength constraint of field, and the plasma frequency of periodicity sub-wavelength structure can be changed flexibly by the physical dimension changing sub-wavelength structure.Metal wire smooth is at present considered to one of best terahertz waveguide, and its guided wave is based on normal SPPs mechanism.This guided wave has the advantage of low-loss and low dispersion, but retrains poor.Therefore, 2006, the people such as Maier and Wang Qing month seminar have all arrived the concept of SSPPs on the geometry position shape of metal wire, demonstrate the ring groove carving periodic distribution on ideal wire along its length in theory, can transmit SSPPs and the sub-wavelength constraint realizing field.Compare smooth metal line, above-mentioned metal wire structure can realize the highly constrained of THz wave.
All the time, spatial ripple is extensively studied to the conversion of SPPs, as passed through prism-coupled or diffraction grating.But study very few for guided wave to the conversion of SSPPs.2013, Southeast China University proposes and a kind ofly realizes the structure of guided wave to the efficient conversion of SSPPs at microwave frequency band, it is by traditional co-planar waveguide (coplanarwaveguide, be called for short CPW) and " tooth type " plasma waveguide (ultra-thin periodic structure metal band) formation, devise the matching transition band of gash depth gradual change between the two.Matching transition part achieves wave vector coupling and the impedance matching of CPW and plasma waveguide, this structure achieves high efficiency from guided wave to SpoofSPPs and wide-band conversion in microwave section, for plasma function element and circuit have started application prospect the height of microwave section is integrated.But consider the electromagnetic field pattern transmitted in " tooth type " plasma waveguide, for other conventional waveguide, as coaxial waveguide, such scheme will be no longer applicable.
Summary of the invention
Technical problem: technical problem to be solved by this invention can not realize the defect of the Efficient Conversion function between coaxial waveguide for relating to " tooth type " plasma wave guide structure in background technology, a kind of structure simple symmetric, compact dimensions are provided, are easy to traditional microwave transmission line with the use of the good coaxial waveguide of, performance to artificial surface plasma waveguide transducer, with implementation space guided wave to the efficient of SSPPs and broadband conversion.
In order to achieve the above object, technical scheme of the present invention is achieved in that
A kind of coaxial waveguide, to artificial surface plasma waveguide transducer, is characterized in that: comprise the coaxial waveguide of two ends symmetry and the coaxial waveguide transition waceguide to artificial surface plasma waveguide, and the artificial surface plasma waveguide of centre;
Wherein, transition waceguide comprises inner wire and outer conductor transition, and the periodicity ring groove array that inner conductor transition is increased progressively by the degree of depth realizes, and the horn antenna that outer conductor transition is magnified gradually by opening realizes; Artificial surface plasma waveguide is made up of the periodicity ring groove array of constant depth.
The present invention is furtheing investigate space guided wave on the basis of the transformation mechanism of SSPPs, use for reference the thought that co-planar waveguide transforms to plasma waveguide, according to the type of the space guided wave of transmission in coaxial waveguide (main mould TEM ripple), select artificial surface plasma waveguide and its formation hybrid structure of etching period ring groove, finally realize the Efficient Conversion of coaxial waveguide to artificial surface plasma waveguide.
The present invention can regulate the physical dimension of transition waceguide and artificial surface plasma waveguide according to the type of coaxial waveguide and size, and then realize the conversion to SSPPs of microwave section or terahertz wave band space guided wave, the waveguide type that further rich space guided wave transforms to SSPPs and mode, realize plasma Meta Materials and apply more widely in microwave transmission line.
The present invention has following beneficial effect:
1. the present invention mainly proposes a kind ofly to realize the Efficient Conversion structure of coaxial waveguide to artificial surface plasma waveguide, especially design in conjunction with the transmission form of SSPPs in guided wave in coaxial waveguide and artificial surface plasma waveguide and realize the transition structure of coaxial waveguide to the Efficient Conversion of plasma waveguide, a critical difficult problem is solved to the application of the conversion of artificial SPPs for realizing guided wave, thus expanded guided wave to the application type of SSPPs Efficient Conversion and scope, for it has opened up a kind of new application prospect.
2. the present invention has bilateral coaxial waveguide interface surface, support that symmetrical export structure designs, this hybridization waveguide structurally comprises medianly zygomorphic coaxial waveguide, the artificial surface plasma waveguide of the etching ring groove of the middle change in the constant cycle and the transition structure of connection coaxial waveguide and artificial surface plasma waveguide.This waveguide is based on the design philosophy of co-planar waveguide to " tooth type " plasma waveguide transferring structure, proposes the ring groove structure that utilizes the degree of depth to increase progressively to realize wave number coupling between coaxial waveguide and artificial surface plasma waveguide and outer conductor adopts horn antenna gradual change to realize the impedance matching between coaxial waveguide and artificial surface plasma waveguide.This stereochemical structure can realize the symmetrical input and output mode of signal and have greater flexibility in the design of microwave device and integrated circuit structure.
3. strong innovation, technology is perspective good: this coaxial waveguide, to artificial surface plasma waveguide converter structure, achieves electromagnetic strong locality and high efficiency of transmission at microwave frequency band, strong innovation, has no this type of transformational structure both at home and abroad; It can well with traditional microwave transmission line with the use of, and can be applicable to terahertz wave band, expanded the range of application of artificial surface Plasma Transport line, there is good technology perspective.
4. high, the bandwidth of efficiency; The present invention finally can realize coaxial waveguide and transform to the efficient of artificial surface plasma waveguide and broadband.Within the scope of 0 ~ 18GHz, S
11and S
21satisfactory for result in broad frequency band.S within the scope of 0.9 ~ 1.2GHz and 2.7 ~ 13.6GHz
11all below-15dB, S in 3.5 ~ 12.4 scopes
21all be greater than-2dB, within the scope of 3.5 ~ 5GHz and 11.4 ~ 12.4GHz, S
21change in-1dB and-2dB scope, S within the scope of 6.3 ~ 9.7GHz
21nearly all be greater than-0.55dB, in wide frequency range, achieve the Efficient Conversion of guided wave to SSPPs.
Accompanying drawing illustrates:
Fig. 1 is the front view of embodiment one;
Fig. 2 (a) is the structural profile front view of embodiment two;
Fig. 2 (b) is the left view of the coaxial waveguide part of embodiment two;
Fig. 2 (c) is the inner wire figure of the transition portion of embodiment two;
Fig. 2 (d) is the outer conductor figure of the transition portion of embodiment two;
Fig. 2 (e) be embodiment two artificial surface plasma waveguide figure;
Fig. 3 is that the change of the depth of groove of embodiment two transition waceguide ring groove array is to the influence curve figure of its dispersion characteristics;
Fig. 4 is the S parameter design sketch of embodiment two.
Specific embodiments:
Be described in further detail below in conjunction with the enforcement of accompanying drawing to technical scheme:
Embodiment one
As shown in Fig. 2 (a), transducer is made up of to the transition waceguide of artificial surface plasma waveguide and the artificial surface plasma waveguide in intermediate constant cycle medianly zygomorphic coaxial waveguide and coaxial waveguide.Transition waceguide comprises inner wire and outer conductor transition, and the periodicity ring groove array that inner conductor transition is increased progressively by the degree of depth realizes, and the horn antenna that outer conductor transition is magnified gradually by opening realizes; Artificial surface plasma waveguide is made up of the periodicity ring groove array of constant depth.The parameters of structural dimension of transition waceguide and artificial surface plasma waveguide regulates according to the type of coaxial waveguide and size, matches with coaxial waveguide parameter (as waveguide type, waveguide length, waveguide cross-section size etc.).
Embodiment two
For coaxial waveguide shown in such as Fig. 2 (b), region I is medianly zygomorphic coaxial waveguide, single overall length l
1=15 millimeters, waveguide inner conductor outer diameter 2R
1=7 millimeters, outer conductor internal diameter 2R
2=16 millimeters, wall thickness t=1 millimeter.The coaxial waveguide at transducer two ends all can as the input/output terminal of guided wave signals, and when one of them coaxial waveguide is as input, another on-axis wave directive/guide is output.
Medianly zygomorphic transition waceguide is connected with the coaxial waveguide of homonymy respectively, plays effect signal being converted into efficiently SSPPs signal.As shown in Fig. 2 (c), Fig. 2 (d), transition waceguide region II comprises inner wire and outer conductor transition.On inner conductor transition, the gradual change degree of depth of ring-like groove array is from h
1=0.25 millimeter increases to h gradually by step delta h=0.25 millimeter
2=2.75 millimeters, the remainder of ring groove array keeps the ultimate depth h of gradual change
2, be used for realizing the wave number coupling between coaxial waveguide and artificial surface plasma waveguide, the change of the ring groove degree of depth on the impact of its dispersion characteristics as shown in Figure 3.The horn antenna gradual change of outer conductor adopts internal diameter from 2R
2=16 millimeters are smoothly incremented to 2R
3=37.16 millimeters, thickness is t=1 millimeter, is used for realizing the impedance matching between coaxial waveguide and artificial surface plasma waveguide, and the horizontal cycle spacing d=3 millimeter of adjacent two ring grooves in transition waceguide, the total length of monolateral transition waceguide is l
2=60 millimeters.
The artificial surface plasma waveguide in intermediate constant cycle is as the carrier of SSPPs Signal transmissions.As shown in Fig. 2 (e), the artificial surface plasma waveguide of mid portion region III is a=1 millimeter by recess width, degree of depth h
2=2.75 millimeters, the ring groove array composition of the horizontal cycle spacing d=3 millimeter of adjacent two grooves, length l
3=150 millimeters.This embodiment transducer total length is 300 millimeters.
According to embodiment two, utilize the efficient performance that electromagnetic simulation software can obtain as shown in Figure 4, within the scope of 0 ~ 18GHz, S
11and S
21satisfactory for result in broad frequency band.S within the scope of 0.9 ~ 1.2GHz and 2.7 ~ 13.6GHz
11all below-15dB, S in 3.5 ~ 12.4 scopes
21all be greater than-2dB, within the scope of 3.5 ~ 5GHz and 11.4 ~ 12.4GHz, S
21change in-1dB and-2dB scope, S within the scope of 6.3 ~ 9.7GHz
21nearly all be greater than-0.55dB.The Efficient Conversion of guided wave to SSPPs is achieved in wide frequency range.
Claims (5)
1. a coaxial waveguide is to artificial surface plasma waveguide transducer, it is characterized in that: comprise the artificial surface plasma waveguide be positioned in the middle of described transducer, be positioned at two coaxial waveguides at described transducer two ends, divide with described two coaxial waveguides two transition waceguides being clipped to artificial surface plasma waveguide, and two coaxial waveguides and two transition waceguides are all that two ends are symmetrical about described transducer;
Wherein, transition waceguide comprises inner conductor transition and outer conductor transition, the periodicity ring groove array that inner conductor transition is increased progressively towards artificial surface plasma waveguide direction by the degree of depth realizes, and outer conductor transition becomes large horn antenna towards artificial surface plasma waveguide direction gradually by opening and realizes; Artificial surface plasma waveguide is made up of the periodicity ring groove array of constant depth, and in transition waceguide, inner wire is connected with artificial surface plasma waveguide.
2. a kind of coaxial waveguide according to claim 1 is to artificial surface plasma waveguide transducer, it is characterized in that: in transition waceguide, and the ring groove array gradual change of inner conductor transition adopts the degree of depth from h
1h is incremented to according to constant step size Δ h
2, the remainder of ring groove array keeps the ultimate depth h of gradual change
2; The horizontal cycle distance of adjacent two grooves of ring groove array is d; The horn antenna gradual change of outer conductor transition adopts internal diameter from 2R
2smoothly be incremented to 2R
3, thickness is that t remains unchanged, the single total length l of transition waceguide
2, parameter h
1, Δ h, h
2, d, R
2, R
3, t, l
2with coaxial waveguide match parameters.
3. a kind of coaxial waveguide according to claim 1 and 2 is to artificial surface plasma waveguide transducer, it is characterized in that: artificial surface plasma waveguide is d by the horizontal cycle distance of adjacent two ring grooves, and recess width is a, and the degree of depth is h
2ring groove array composition, total length is l
3, parameter d, a, h
2, l
3with coaxial waveguide match parameters.
4. a kind of coaxial waveguide according to claim 1 and 2 is to artificial surface plasma waveguide transducer, it is characterized in that: arbitrarily the coaxial waveguide of one end is as the input of guided wave signals, and the on-axis wave directive/guide of the other end is output.
5. a kind of coaxial waveguide according to claim 3 is to artificial surface plasma waveguide transducer, it is characterized in that: arbitrarily the coaxial waveguide of one end is as the input of guided wave signals, and the on-axis wave directive/guide of the other end is output.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019161028A1 (en) * | 2018-02-17 | 2019-08-22 | Fractal Antenna Systems, Inc. | Vivaldi horn antennas incorporating fps |
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| CN109473757B (en) * | 2015-07-30 | 2020-03-10 | 上海理工大学 | Broadband transmission line chip |
| CN105633522B (en) * | 2015-12-29 | 2018-08-21 | 东南大学 | Spring layer transmission line based on artificial surface plasmon |
| CN105703048B (en) * | 2016-01-13 | 2018-07-13 | 北京大学 | A kind of ultra wide band Terahertz class surface plasma excimer coupler and coupling process |
| CN106935947A (en) * | 2017-04-12 | 2017-07-07 | 南京航空航天大学 | The tunneling effect and its method of work of artificial surface plasmon |
| CN113488751B (en) * | 2021-06-24 | 2022-06-03 | 电子科技大学 | Rectangular waveguide-artificial surface plasmon polariton transition structure |
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