CN105119030A - Ultra-wideband artificial surface Plasmon low-pass filter - Google Patents
Ultra-wideband artificial surface Plasmon low-pass filter Download PDFInfo
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- CN105119030A CN105119030A CN201510591849.5A CN201510591849A CN105119030A CN 105119030 A CN105119030 A CN 105119030A CN 201510591849 A CN201510591849 A CN 201510591849A CN 105119030 A CN105119030 A CN 105119030A
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Abstract
The invention discloses an ultra-wideband artificial surface Plasmon low-pass filter which is mainly formed by a dielectric substrate layer and metallic foil layers printed on the both side surfaces of the dielectric substrate layer. Waveguide structures are engraved on the metallic foil layers. Each waveguide structure is formed by a middle surface Plasmon waveguide portion, symmetric microstrip line portions at both ends, and two transition portions. The ultra-wideband artificial surface Plasmon low-pass filter may achieve effective transmission of artificial surface Plasmon waveguide, and has symmetric structure, easy processing, compact size, a ultra-wide band and high filtering performance, and is especially suitable for being used in cooperation with a conventional microwave or terahertz transmission line.
Description
Technical field
The present invention relates to a kind of filter construction, particularly relate to a kind of ultra broadband artificial surface plasmon low pass filter.
Background technology
Surface plasmons is the mixed activation state existed with a kind of electronics on metal and medium (normally air) interface and photon.It is a kind of surface electromagnetic wave in essence, can break through diffraction limit, and electromagnetic field is constrained within the scope of the sub-wavelength near metal and medium interface, has very strong field enhancement effect.This type of research had once once been limited in optical band or higher frequency, due to the good characteristic of surface plasmons, if by the concept of surface plasmons to low-frequency range (microwave or terahertz wave band), contribute to the guided wave technology obtaining high binding microwave or terahertz signal, and it is highly integrated to realize the device size of low-frequency range to be reduced to sub-wavelength magnitude.Subsequently, the concept of low-frequency range (microwave or terahertz wave band) artificial surface plasmon is suggested, its basic thought is the method at metal surface etching sub-wavelength hole or groove, strengthen electromagnetic field in intrametallic penetrating power, realize the sub-wavelength constraint of field, thus reduce the equivalent plasma frequency of metal the geometric parameter by metallic surface structures effectively controls its plasma frequency, for full new page has been opened in the development of low frequency surface plasmons and application.
At present, the research for how, space guided wave being converted efficiently to artificial surface plasmon is very few.Recently, Southeast China University proposes and is a kind ofly encouraged the ultra-thin waveguiding structure realizing the efficient of artificial surface plasmon and broadband transmission by co-planar waveguide at microwave frequency band.The program proposes a kind of matching transition structure, in order to realize wave vector between co-planar waveguide and artificial surface plasma waveguide and impedance matching, thus the high efficiency achieved between guided wave and artificial surface plasmon and wideband conversion, for plasma function element and circuit have started application prospect the height of microwave section is integrated.
Summary of the invention
Technical problem: technical problem to be solved by this invention can not realize the defect with conventional microstrip line Efficient Conversion function for plasma wave guide structure, design a kind of structure simple symmetric, compact dimensions, be easy to traditional microwave transmission line with the use of microstrip line to plasma waveguide transformational structure, use as a kind of ultra broadband artificial surface plasmon low pass filter to the basis that the efficient of artificial surface plasmon and ultra broadband transform at implementation space guided wave, the design and application that can be filter provides a kind of brand-new thinking and scheme.
In order to achieve the above object, technical scheme of the present invention is achieved in that
A kind of ultra broadband artificial surface plasmon low pass filter, be made up of medium substrate and the metal foil layer that is printed on medium substrate upper and lower surface, it is characterized in that, metal foil layer is carved with waveguiding structure, waveguiding structure comprises the microstrip line construction of two ends symmetry, microstrip line construction to the transition structure of surface plasma primitive waveguiding structure, and the surface plasmon polariton waveguide structure of centre, described transition structure is connected to form by First Transition structure and the second transition structure.
Preferably, the metal ground plate of microstrip line construction, at the metal center conduction band of medium substrate upper surface continuity microstrip line construction, is realized gradual change by curve at medium substrate lower surface and makes the metal center conduction band of its terminal and microstrip line construction wide by First Transition structure; Second transition structure is distributed by the conduction band of the heart in a metal bilateral symmetry being symmetrically distributed in the upper and lower surface of medium substrate and the periodicity sub-wavelength metal grid array that length is staged to be increased forms.
The present invention can by regulating the physical dimension of artificial surface plasmon polariton waveguide, realize the mutual conversion between microwave or terahertz wave band microstrip line to artificial surface plasmon waveguide, and then realize ultra broadband filter function, thus provide a kind of brand-new thinking and scheme at microwave or Terahertz frequency range to the design and application of artificial surface plasmon Meta Materials device.
The present invention has following beneficial effect:
1. the present invention mainly proposes a kind of ultra broadband artificial surface plasmon low pass filter based on microstrip line to the thought of the efficient conversion of artificial surface plasmon waveguide, this structure has been come by the gradual change of periodicity sub-wavelength metal grid array, realize the wave number between microstrip line and the waveguide of artificial surface plasmon and impedance matching, the application transformed to artificial surface plasmon for realizing guided wave solves a critical difficult problem, for the design and application of artificial surface plasmons Meta Materials device has opened up prospect more widely;
2. strong innovation, technology is perspective good: the present invention achieves electromagnetic strong locality and the transmission of high-efficiency broadband band at microwave frequency band, and strong innovation, has no this type of filter structure both at home and abroad; The present invention can well with traditional microwave transmission line with the use of, be convenient to be integrated in Advanced Microwave circuit, and can be applicable to terahertz wave band, expanded the range of application of plasmon transmission line, there is good technology perspective;
3. structure is simple, be easy to manufacture: the periodicity sub-wavelength metal grid of the symmetry that the present invention includes traditional microstrip line and be printed on medium substrate upper and lower surface is formed, simple and compact for structure, common printed circuit board process technology can be adopted to realize, in the design of microwave device and integrated circuit structure, there is very large flexibility.
4. high, the bandwidth of efficiency of transmission; The present invention is within the scope of 0 ~ 10GHz, and S11 is all less than-10dB, and S21 is all greater than-0.6dB, achieves the high efficiency of transmission of signal in the waveguide of artificial surface plasmon and ultra broadband filter function.
Accompanying drawing explanation
Fig. 1 (a) is the Facad structure figure of filter of the present invention;
Fig. 1 (b) is the inverse layer structure figure of filter of the present invention;
Fig. 2 is that the change of the grid length of the artificial surface plasmon waveguide of embodiment two is to the effect diagram of its dispersion curve;
Fig. 3 is the S parameter curve chart of embodiment two.
Embodiment
Be described in further detail below in conjunction with the enforcement of accompanying drawing to technical scheme:
Embodiment one
As shown in Fig. 1 (a), Fig. 1 (b), the metal foil layer that the present invention includes medium substrate layer and be printed in medium substrate upper and lower surface.Metal foil layer is carved with waveguiding structure, waveguiding structure primarily of the microstrip line part (region I) of two ends symmetry, the microstrip line construction of two ends symmetry to the transition portion (region II and III) of surface plasma primitive waveguiding structure and intermediate surface plasmon waveguides sections (region IV) composition.Wherein, microstrip line part comprises medium substrate layer and is printed on metal center conduction band and the metal ground plate of substrate upper and lower surface.The width of metal ground plate is greater than metal center conduction band width.Transition portion all comprises two transition stages, the metal ground plate of microstrip line construction, at the metal center conduction band of medium substrate upper surface continuity microstrip line construction, is realized gradual change by curve at medium substrate lower surface and makes the metal center conduction band of its terminal and microstrip line construction wide by the First Transition stage (region II).Second transition structure (region III) is distributed by the conduction band of the heart in a metal bilateral symmetry being symmetrically distributed in the upper and lower surface of medium substrate and the periodicity sub-wavelength metal grid array that length is staged to be increased forms.Region IV is made up of and the periodicity sub-wavelength metal grid array of consistent length symmetrical along metal center conduction band direction, and symmetry is printed on the upper and lower surface of medium substrate.The geometric parameter of region II, III, IV regulates according to the type of microstrip line (region I) and size, matches with microstrip line parameter (as line type, line length, line width etc.).
Embodiment two
As Fig. 1 (a), Fig. 1 (b) are depicted as front of the present invention, inverse layer structure figure, the horizontal total length of the present invention is 165 millimeters, transverse width w=30 millimeter.It is 0.018 millimeter that the thickness of metal foil layer is, and the thickness of medium substrate is 0.254 millimeter, and dielectric constant is 2.2.The horizontal total length of region I part is L
1=5 millimeters, wherein, upper surface metal center conduction band width g=0.75 millimeter, lower surface ground plate transverse width L=24 millimeter; Region II (left side First Transition stage) horizontal total length is L
2=17.5 millimeters, wherein upper surface metal center conduction band and microstrip line part are consistent, and the ground plate transverse width of lower surface can by Goubau curve
realize gradual change (note: the form of curve is not unique, but need ensure the smooth realization in First Transition stage), wherein, curve radian α=0.2, p
1(x
1, y
1) and p
2(x
2, y
2) being respectively starting point and the terminal of curve, the metal center conduction band finally realizing its terminal and microstrip line upper surface is wide; Region III (left side second transition stage) is distributed with along metal center conduction band bilateral symmetry the period grid that 7 length increase gradually, and wherein grid length is from l
1=0.3 millimeter increases to l gradually with constant interval Δ l=0.3 millimeter
7=2.1 millimeters, the cycle is p=5 millimeter, and the width a of grid is 1 millimeter, the horizontal total length L of region III
3=35 millimeters; Region IV is the Signal transmissions carrier of artificial surface plasmon polariton waveguide as corresponding frequency band, and horizontal overall length is L
4=25 millimeters, the monosymmetric grid array cycle is p=5 millimeter, width a=1 millimeter, length are 2.1 millimeters.
The First Transition stage realizes wave number between microstrip line and wide two-wire ribbon feeder and impedance matching by the transverse width changing microstrip line lower surface ground plate; Second transition stage realizes wave number and impedance matching between wide two-wire ribbon feeder and the waveguide of artificial surface plasmon by the periodicity grid of gradual change, thus plays the guided wave signals high-efficiency broadband band in microstrip line is converted into the effect of artificial surface plasmon.Wherein, the length variations of element grid structure on the impact of its dispersion curve as shown in Figure 2.
According to embodiment two, utilize the efficient performance that electromagnetic simulation software can obtain as shown in Figure 3, within the scope of 0 ~ 10GHz, S11 is all less than-10dB, S21 is all greater than-0.6dB, achieves the high efficiency of transmission of signal in the waveguide of artificial surface plasmon and the function of ultra broadband filtering.
Claims (6)
1. a ultra broadband artificial surface plasmon low pass filter, be made up of medium substrate and the metal foil layer that is printed on medium substrate upper and lower surface, it is characterized in that, metal foil layer is carved with waveguiding structure, waveguiding structure comprises the microstrip line construction of two ends symmetry, microstrip line construction to the transition structure of surface plasma primitive waveguiding structure, and the surface plasmon polariton waveguide structure of centre, described transition structure is connected to form by First Transition structure and the second transition structure.
2. a kind of ultra broadband artificial surface plasmon low pass filter according to claim 1, it is characterized in that: the metal ground plate of microstrip line construction, at the metal center conduction band of medium substrate upper surface continuity microstrip line construction, is realized gradual change by curve at medium substrate lower surface and makes the metal center conduction band of its terminal and microstrip line construction wide by First Transition structure; Second transition structure is distributed by the conduction band of the heart in a metal bilateral symmetry being symmetrically distributed in the upper and lower surface of medium substrate and the periodicity sub-wavelength metal grid array that length is staged to be increased forms.
3. a kind of ultra broadband artificial surface plasmon low pass filter according to claim 1, is characterized in that: intermediate surface plasmon waveguiding structure is distributed by the conduction band of the heart in a metal bilateral symmetry being symmetrically distributed in the upper and lower surface of medium substrate and the periodicity sub-wavelength metal grid array of consistent length forms.
4. a kind of ultra broadband artificial surface plasmon low pass filter according to claim 1, it is characterized in that: the thickness of the metal foil layer of medium substrate upper and lower surface is identical, length is equal with medium substrate.
5. a kind of ultra broadband artificial surface plasmon low pass filter according to claim 1, is characterized in that: the metal grate cycle of transition structure and surface plasmon polariton waveguide structure and the interval of adjacent metal grid all identical.
6. a kind of ultra broadband artificial surface plasmon low pass filter according to claim 1, is characterized in that: arbitrarily the microstrip line of one end is as the input/output of guided wave signals, and the microstrip line of the other end is then output/input.
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Cited By (15)
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| CN105789800A (en) * | 2016-03-11 | 2016-07-20 | 厦门大学 | Terahertz waveguide based on spoof surface plasmon polaritons |
| CN105811056A (en) * | 2016-04-21 | 2016-07-27 | 六盘水师范学院 | Artificial plasmon type band pass filter |
| CN105896004A (en) * | 2016-04-21 | 2016-08-24 | 六盘水师范学院 | Artificial plasmon type microwave band pass filter with step impedance unit |
| CN105932376A (en) * | 2016-06-01 | 2016-09-07 | 六盘水师范学院 | Microwave band-pass filter with double transmission line structure |
| CN106505286A (en) * | 2016-11-21 | 2017-03-15 | 电子科技大学 | A kind of ultra broadband parting structure artificial surface plasmon power splitter |
| CN107582054A (en) * | 2017-08-16 | 2018-01-16 | 电子科技大学 | A kind of moisture content of skin detection sensor based on surface plasma excimer |
| CN108987936A (en) * | 2018-07-25 | 2018-12-11 | 中国人民解放军空军工程大学 | A kind of three-dimensional band logical frequency selecting structures and preparation method thereof |
| CN109244609A (en) * | 2018-09-11 | 2019-01-18 | 区庆元 | A kind of square groove structure microwave filter with dual band operation characteristic |
| CN110380217A (en) * | 2019-07-26 | 2019-10-25 | 南京邮电大学 | High-gain end-on-fire antenna based on artificial surface plasmon |
| CN110676545A (en) * | 2019-08-26 | 2020-01-10 | 中国电子科技集团公司第十三研究所 | Multi-branch filter |
| CN110718731A (en) * | 2019-09-12 | 2020-01-21 | 东南大学 | Artificial surface plasmon transmission line excitation device based on microstrip line interface |
| CN110729542A (en) * | 2019-09-19 | 2020-01-24 | 东南大学 | Artificial surface plasmon integrated dynamic adjustable transmission device based on graphene |
| CN110739998A (en) * | 2019-09-25 | 2020-01-31 | 东南大学 | Mode division multiplexing circuit based on artificial surface plasmon |
| CN114284667A (en) * | 2021-12-20 | 2022-04-05 | 南京航空航天大学 | Low-pass filtering transmission structure based on slip symmetric artificial surface plasmons |
| CN114284657A (en) * | 2021-12-20 | 2022-04-05 | 南京航空航天大学 | Ultra-compact low-pass filtering structure based on double-layer artificial surface plasmons |
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Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105789800B (en) * | 2016-03-11 | 2019-03-01 | 厦门大学 | Terahertz waveguide based on artificial surface phasmon |
| CN105789800A (en) * | 2016-03-11 | 2016-07-20 | 厦门大学 | Terahertz waveguide based on spoof surface plasmon polaritons |
| CN105811056A (en) * | 2016-04-21 | 2016-07-27 | 六盘水师范学院 | Artificial plasmon type band pass filter |
| CN105896004A (en) * | 2016-04-21 | 2016-08-24 | 六盘水师范学院 | Artificial plasmon type microwave band pass filter with step impedance unit |
| CN105811056B (en) * | 2016-04-21 | 2019-10-29 | 六盘水师范学院 | A kind of artificial phasmon type bandpass filter |
| CN105932376A (en) * | 2016-06-01 | 2016-09-07 | 六盘水师范学院 | Microwave band-pass filter with double transmission line structure |
| CN105932376B (en) * | 2016-06-01 | 2019-03-19 | 六盘水师范学院 | A kind of microwave band-pass filter with pairs of transmission line structure |
| CN106505286A (en) * | 2016-11-21 | 2017-03-15 | 电子科技大学 | A kind of ultra broadband parting structure artificial surface plasmon power splitter |
| CN106505286B (en) * | 2016-11-21 | 2019-02-15 | 电子科技大学 | A kind of ultra wide band parting structure artificial surface plasmon power splitter |
| CN107582054A (en) * | 2017-08-16 | 2018-01-16 | 电子科技大学 | A kind of moisture content of skin detection sensor based on surface plasma excimer |
| CN108987936B (en) * | 2018-07-25 | 2020-11-13 | 中国人民解放军空军工程大学 | Three-dimensional band-pass frequency selection structure and manufacturing method thereof |
| CN108987936A (en) * | 2018-07-25 | 2018-12-11 | 中国人民解放军空军工程大学 | A kind of three-dimensional band logical frequency selecting structures and preparation method thereof |
| CN109244609B (en) * | 2018-09-11 | 2019-10-29 | 区庆元 | A kind of square groove structure microwave filter with dual band operation characteristic |
| CN109244609A (en) * | 2018-09-11 | 2019-01-18 | 区庆元 | A kind of square groove structure microwave filter with dual band operation characteristic |
| CN110380217A (en) * | 2019-07-26 | 2019-10-25 | 南京邮电大学 | High-gain end-on-fire antenna based on artificial surface plasmon |
| CN110676545A (en) * | 2019-08-26 | 2020-01-10 | 中国电子科技集团公司第十三研究所 | Multi-branch filter |
| CN110718731A (en) * | 2019-09-12 | 2020-01-21 | 东南大学 | Artificial surface plasmon transmission line excitation device based on microstrip line interface |
| CN110718731B (en) * | 2019-09-12 | 2021-10-19 | 东南大学 | Artificial surface plasmon transmission line excitation device based on microstrip line interface |
| CN110729542A (en) * | 2019-09-19 | 2020-01-24 | 东南大学 | Artificial surface plasmon integrated dynamic adjustable transmission device based on graphene |
| CN110739998B (en) * | 2019-09-25 | 2021-10-19 | 东南大学 | Mode division multiplexing circuit based on artificial surface plasmon |
| CN110739998A (en) * | 2019-09-25 | 2020-01-31 | 东南大学 | Mode division multiplexing circuit based on artificial surface plasmon |
| CN114284667A (en) * | 2021-12-20 | 2022-04-05 | 南京航空航天大学 | Low-pass filtering transmission structure based on slip symmetric artificial surface plasmons |
| CN114284657A (en) * | 2021-12-20 | 2022-04-05 | 南京航空航天大学 | Ultra-compact low-pass filtering structure based on double-layer artificial surface plasmons |
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