CN104810579A - Tunable bandstop filter based on artificial surface plasmon - Google Patents
Tunable bandstop filter based on artificial surface plasmon Download PDFInfo
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- CN104810579A CN104810579A CN201510240420.1A CN201510240420A CN104810579A CN 104810579 A CN104810579 A CN 104810579A CN 201510240420 A CN201510240420 A CN 201510240420A CN 104810579 A CN104810579 A CN 104810579A
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Abstract
The invention relates to a tunable bandstop filter based on artificial surface plasmons, which belongs to tunable bandstop filters and aims to effectively utilize spectrum resources and satisfy the requirements of a modern communication system on flexibility of equipment. The filter comprises a dielectric substrate, a waveguide of a periodic metal grating structure, two same split ring resonators, a coplanar waveguide and coupled structures, wherein the two same split ring resonators are used for loading variable-capacitance diodes, and the coupled structures are respectively connected to both ends of the waveguide of the periodic metal grating structure; specifically, guided waves which are transmitted by the coplanar waveguide are converted into the artificial surface plasmons transmitted on a periodic metal grating by the coupled structures; the periodic metal grating structure is an artificial surface plasmon transmission structure; the split ring resonators for loading the variable-capacitance diodes are combined with the periodic metal grating, so as to form a tunable structure. The tunable bandstop filter based on the artificial surface plasmons have the advantages of simple structure, large suppression in a stop band, high tuning speed and easiness in integration with other microwave circuits.
Description
Technical field
The present invention relates to a kind of tunable band-stop filter, particularly a kind of tunable band-stop filter based on artificial surface phasmon.
Background technology
Microwave filter is as one of device basic in communication system, radar system, measuring system, and its performance can have influence on the quality of whole communication system.Under day by day crowded radio spectrum resources and complicated electromagnetic environment, a study hotspot of wireless communication field how effectively to utilize frequency spectrum resource in recent years.In order to address this problem and meet the needs of modern communication systems to equipment " flexible and changeable ", electronic control technology arises at the historic moment.Generally, make an electrically tunable filter, need active switch or adjustable device, as PIN pipe, variable capacitance diode, or other elements based on functional material, comprise ferroelectric varactor, they are integrated in passive device, thus by regulation and control external voltage, realize the conversion of frequency filtering.It is simple that electrically tunable filter has structure, and tuned speed waits good characteristic soon.
Utilize nanostructured metal surface that the Prior efforts that electromagnetic wave is strapped in by force conductive surface can be traced back to last century five, the sixties, researcher utilizes the metal surface of gauffer to realize the transmission of electromagnetic surface wave in microwave section.2005, the John B.Pendry professor of Imperial College of Britain and partner thereof propose the concept of artificial surface phasmon first, point out that the nanostructured metal surface of two-dimension periodic borehole has the dispersion characteristics similar to optical band metal structure surface phasmon, electromagnetic wave can be constrained in medium/metal interface and transmit in the scope of wavelength.The equivalent plasma frequency on this nanostructured metal surface is only relevant with the geometric parameter of surface texture, can be extended to far infrared, Terahertz and microwave band.After the work of John B.Pendry, the people such as the C.R.Williams of the A.P.Hibbins of University of Exeter of Britain etc. and University of Bath are successively in microwave and the terahertz wave band experimental verification existence of artificial surface phasmon.Manual control artificial surface plasma frequency is carried out by the structural parameters changing metal surface, it is made to extend to Terahertz and microwave section, realize tiing up the intense beam of THz wave and microwave, for the transmission and local realizing sub-wavelength ripple on low-frequency range (far infrared, Terahertz, microwave band) metal surface opens an effective way.Guided wave structure formed based on this periodicity grating, we have proposed the design of a kind of artificial surface phasmon band stop filter.It is compacter that this filter construction compares traditional filter construction, and structure is simple, has flexibility, is easier to and is integrated in microwave integrated circuit.
Summary of the invention
The object of the invention is to provide a kind of structure simple, the tunable band-stop filter based on artificial surface phasmon that tuned speed is fast
The object of the present invention is achieved like this: this tunable band-stop filter comprises: the port at medium substrate and two ends; Also comprise periodically straight metal grating, the metal openings resonant ring of two identical loading variable capacitance diodes, co-planar waveguide and coupled structure;
The straight metal grating waveguide of described periodicity distinguishes butt coupling structure and co-planar waveguide by centre to two ends; The metal openings resonant ring of two identical loading variable capacitance diodes combines with periodically straight metal grating and forms tunable structure; Described co-planar waveguide is guided wave transmission structure; Described coupled structure is coupler, and coupled structure is made up of the periodicity metal grating of groove depth gradual change and the metallic conductor of arc shape; The straight metal grating of described periodicity is the artificial surface phasmon transmission structure that groove depth is identical, the cycle is consistent; The metal openings resonant ring of two identical loading variable capacitance diodes is printed on medium substrate front in the same manner; The structure that described periodicity straight metal grating two ends order is connected with coupled structure and co-planar waveguide, is printed on medium substrate front;
Described artificial surface phasmon transmitter is made up of the metal unit of periodic arrangement; Described metal unit is metallic film; The shape of described metal unit is rectangle, and the length of each metal unit is all identical with width; Described metal unit is provided with the groove perpendicular to artificial surface phasmon transmitter length direction; Described groove is positioned at the homonymy of artificial surface phasmon transmitter, and the width of groove is all identical with the degree of depth.
Further, the becket split ring resonator of two identical loading variable capacitance diodes is square aperture rings, and the opening of square aperture ring and straight metal grating slot opening staggered relatively, square aperture ring open lower side is identical with the gap of groove dual-side with groove base; By controlling the surface groove degree of depth of straight metal grating structure, width and periodically changing the dispersion curve of metal surface, design meets the metal grating structure of working frequency range.
Further, described loading variable capacitance diode is loaded into metal openings resonant ring with welding manner and is formed tunable structure; Coupled structure to achieve by conventional co-planar waveguide to the efficient matchings by single conductor optical grating construction, achieves the efficient conversion between guided wave to plasmon and transmission.
Further, the metal openings resonant ring loading variable capacitance diode is the tunable structure of sub-wavelength, and two resonant ring center distance are the metal unit length of more than three integral multiples, to weaken the mutual interference between two rings.
Further, the waveguide of described periodicity metal grating is the monolateral metal structure having periodic grating structure, supports the high efficiency of transmission of artificial surface phasmon.
Further, described co-planar waveguide is two-conductor line structure, middle conductor and two side conductor spacing unequal, support guided wave mode.
Further, by loading DC offset voltage to variable capacitance diode, changing the resonance frequency of resonant ring, realizing band stop filter regulable center frequency.
Further, two waveband tunable band-stop filter is produced on medium substrate in the manner of a printed circuit board, and wherein the another side of medium substrate is the tabula rasa not covering copper.
Beneficial effect, owing to have employed such scheme, obtain thickness to after the impact of cycle notching construction dispersion characteristics, propose flexibility, can be conformal the concept of artificial surface phasmon, theory analysis and the experimental verification transmission of artificial surface phasmon on superthin structure bonding jumper.This sub-wavelength structure shows very excellent instructor in broadcasting's characteristic, can realize the transmission of electromagnetic wave along irregular surfaces such as plane, bending, spirals, have extraordinary application prospect.The high efficiency of transmission of the artificial surface phasmon of periodic grating structure bonding jumper support, has important application in the field such as Signal transmissions and the communication technology.Guided wave structure formed based on this periodicity grating.
Advantage: tunable band-stop filter of the present invention has that novel structure is simple, lightweight, tuning range is wide, tuned speed is fast, stable performance, be convenient to make, be easy to the advantage such as integrated with other plane microwave millimetre-wave circuit, thus has good prospect in the application of microwave and millimeter wave hybrid integrated circuit or millimetre integrated circuit.
(1) tunable band-stop filter of the present invention can be processed on single sided circuits, and the flexible PCB of even superthin structure is processed.
(2) compared with existing microstrip line, this structure does not need ground wire, can free guided wave, has very little loss.
(3) design of complanation is easy to utilize existing microwave, millimeter-wave technology to process, and is easy to integrated with other devices.
(4) by controlling the surface groove degree of depth of straight metal grating structure, width and periodically changing the dispersion curve of metal surface, design meets the metal grating structure of working frequency range.
(5) by regulating the voltage being carried in variable capacitance diode two ends, changing rapidly the resonance frequency of adjustable structure, realizing the object of band stop filter regulable center frequency very soon.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of the tunable band-stop filter that the present invention is based on artificial surface phasmon.
Fig. 2 is the structural representation of metal unit.
Fig. 3 loads the metal openings resonant ring of variable capacitance diode and the position relationship schematic diagram of periodically straight metal grating.
Fig. 4 is the structural representation of the metal openings resonant ring loading variable capacitance diode.
Fig. 5 is the simulation curve of the frequency response of tunable band-stop filter of the present invention.
Embodiment
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described.
Embodiment 1: a kind of tunable band-stop filter based on artificial surface phasmon, comprises the port at medium substrate 5 and two ends; It is characterized in that, comprise the metal openings resonant ring 21 of the identical loading variable capacitance diode 22 of periodically straight metal grating 1, two, co-planar waveguide 3 and coupled structure 4;
The straight metal grating 1 of described periodicity by centre to two ends butt coupling structure 4 and co-planar waveguide 3 successively; The metal openings resonant ring 2 of two identical loading variable capacitance diodes combines with periodically straight metal grating 1 and forms tunable structure; Described co-planar waveguide 3 is guided wave transmission structure; Described coupled structure 4 is coupler,
Coupled structure 4 is made up of the periodicity metal grating 41 of groove depth gradual change and the metallic conductor 42 of arc shape; The straight metal grating of described periodicity 1 is the artificial surface phasmon transmission structure that groove depth is identical, the cycle is consistent; The metal openings resonant ring of two identical loading variable capacitance diodes is printed on medium substrate front in the same manner; The structure that described periodicity straight metal grating two ends order is connected with coupled structure and co-planar waveguide, is printed on medium substrate front;
Described artificial surface phasmon transmitter is made up of the metal unit of periodic arrangement; Described metal unit is metallic film; The shape of described metal unit is rectangle, and the length of each metal unit is all identical with width; Described metal unit is provided with the groove perpendicular to artificial surface phasmon transmitter length direction; Described groove is positioned at the homonymy of artificial surface phasmon transmitter, and the width of groove is all identical with the degree of depth.
The metal openings resonant ring 21 of described two identical loading variable capacitance diodes 22 is square aperture rings, and the opening of square aperture ring and straight metal grating slot opening staggered relatively, square aperture ring open lower side is identical with the gap of groove dual-side with groove base; By controlling the surface groove degree of depth of straight metal grating structure, width and periodically changing the dispersion curve of metal surface, design meets the metal grating structure of working frequency range.
Described loading variable capacitance diode 22 is loaded into metal openings resonant ring 21 with welding manner and is formed tunable structure; Coupled structure to achieve by conventional co-planar waveguide to the efficient matchings by single conductor optical grating construction, achieves the efficient conversion between guided wave to plasmon and transmission.
The metal openings resonant ring 21 of described loading variable capacitance diode 22 is the tunable structure of sub-wavelength, and two resonant ring center distance are the metal unit length of more than three integral multiples, to weaken the mutual interference between two rings.
Described periodicity metal grating waveguide 1 is the monolateral metal structure having periodic grating structure, supports the high efficiency of transmission of artificial surface phasmon.
Described co-planar waveguide is two-conductor line structure, middle conductor and two side conductor spacing unequal, support guided wave mode.
By loading DC offset voltage to variable capacitance diode, changing the resonance frequency of resonant ring, realizing band stop filter regulable center frequency.
Described two waveband tunable band-stop filter is produced on medium substrate 5 in the manner of a printed circuit board, and wherein the another side of medium substrate 5 is the tabula rasa not covering copper.
Concrete:
As depicted in figs. 1 and 2, the present invention is a kind of tunable band-stop filter based on artificial surface phasmon, comprises the metal openings resonant ring 21 of periodically straight metal grating 1, two identical loading variable capacitance diodes 22, co-planar waveguide 3 and coupled structure 4.
Periodically straight metal grating 1 two ends are linked in sequence coupled structure 4 and co-planar waveguide 3.Periodically straight metal grating 1 is artificial surface phasmon transmitter, and co-planar waveguide 3 is guided wave transmission line, and coupled structure 4 is the coupler for conversion mutually between guided wave and artificial surface phasmon.Straight metal grating structure can bend, fold, be wound around, distortion or be wrapped in the transmission level and smooth or unsmooth surface controlling shaped surfaces phasmon.
Wherein, artificial surface phasmon transmitter forms by the metal unit 11 of periodic arrangement, and the shape of metal unit 11 is rectangle, and the length of metal unit 11 is all identical with width.Metal unit 11 is processed by metallic film.Metal unit 11 is provided with the groove 12 perpendicular to artificial surface phasmon transmitter length direction, groove 12 is all positioned at the homonymy of artificial surface phasmon transmitter, the width of groove 12 is all identical with the degree of depth, straight metal grating 1 is long straight shape, metal openings resonant ring 21 is Q-RING, and the opening of straight metal grating 1 and metal openings resonant ring is oppositely arranged.Coupled structure is made up of jointly the metallic conductor 41 of the aperiodic metal grating 42 of gradual change and arc shape, and the metallic conductor of the arc shape of acyclic metal grating both sides is all identical.
Wherein, medium substrate 5 is polyimide substrate, and dielectric constant is 3.1, and thickness is 0.06mm, and loss angle is 0.02.
Metal openings resonant ring 21 is square aperture rings, and the opening of square aperture ring and straight metal grating slot opening staggered relatively, open lower side and the groove base clearance G of square aperture ring are 0.1mm, and the dual-side of opening and the clearance G 1 of groove dual-side are 0.1mm.The metal openings resonant ring 21 of this loading variable capacitance diode is sub-wavelength structure, and two resonant ring center distance are the metal unit length of more than three integral multiples.The metal live width of metal openings resonant ring 21 is 0.3mm, and outer height is 3.6mm, outer wide be 4.6mm.
The metal openings resonant ring of transmission line and loading variable capacitance diode is all a kind of metal structure be printed on medium substrate same plane, length, the height dimension of cellular construction are less than operation wavelength, thickness is far smaller than operation wavelength, surface wave transmission can be strapped in the degree of depth sub-wavelength dimensions scope around metal tape, realize the high efficiency of transmission of energy.Described transmission line is made up of coplanar waveguide structure, coupled structure and periodically straight metal grating structure.By the surface groove degree of depth of the straight metal grating structure of controlling periodic, width and the dispersion curve periodically changing metal surface, design meets the metal grating structure of working frequency range.By regulating the capacitance being carried in variable capacitance diode on becket, changing the resonance frequency of becket, realizing the object of band stop filter regulable center frequency.Tunable band-stop filter of the present invention has that novel structure is simple, lightweight, stable performance, be convenient to make, be easy to the advantage such as integrated with other plane microwave millimetre-wave circuit, thus can well be applied in microwave and millimeter wave hybrid integrated circuit or millimetre integrated circuit.
As marked adjustable groove parameters in Fig. 2, figure, i.e. the cycle P of depth of groove D, recess width A, groove, by increasing depth of groove D, can reduce the cut-off frequency of transmission line surface wave.
As marked the relative position parameter of metal openings resonant ring relative to straight metal grating structure loading variable capacitance diode in Fig. 3, figure.
As Fig. 4, the structural parameters of metal openings resonant ring have been marked in figure, the i.e. outer wide K of resonant ring, resonant ring outer high H, becket live width W and the wide C of opening, by increasing the magnitude of voltage loaded on variable capacitance diode, reduce diode electrically capacitance, increase the resonance frequency of resonant ring, thus increase filter wave frequency, realize tunable band-stop filtering characteristic.
As the two waveband band stop filter performance curve based on artificial surface phasmon in Fig. 5, figure comprises: S21 transmission coefficient and S11 reflection coefficient.Abscissa represents frequency component, and unit is GHz, and left ordinate scale represents amplitude variations, and unit is dB.As can be seen from Figure 5, tunable band-stop filter of the present invention, when magnitude of voltage is respectively 5V, 10V and 20V, frequency is respectively the electromagnetic transmission coefficient S 21 of 9.08GHz, 9.24GHz and 9.43GHz lower than-30dB, the energy of output port is very little, signal ends, and the transmission coefficient S21 of other frequencies is about-2dB, the energy of output port is very large, signal passes through, the frequency values of the magnitude of voltage and filtering that are namely carried in variable capacitance diode presents proportional relationship, by control voltage, can regulate and control filter wave frequency.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. based on a tunable band-stop filter for artificial surface phasmon, it is characterized in that: this tunable band-stop filter comprises the port at medium substrate (5) and two ends; Also comprise periodically straight metal grating (1), the metal openings resonant ring (21) of two identical loading variable capacitance diodes (22), co-planar waveguide (3) and coupled structure (4);
The straight metal grating waveguide (1) of described periodicity by centre to two ends butt coupling structure (4) and co-planar waveguide (3) successively; The metal openings resonant ring (21) of two identical loading variable capacitance diodes (22) combines with periodicity metal grating (1), forms tunable structure;
Described co-planar waveguide (3) is guided wave transmission structure; Described coupled structure (4) is coupler, and coupled structure (4) is made up of the periodicity metal grating (41) of groove depth gradual change and the metallic conductor (42) of arc shape; The straight metal grating of described periodicity (1) is groove depth is identical, the cycle is consistent artificial surface phasmon transmission structure; The metal openings resonant ring of two identical loading variable capacitance diodes is printed on medium substrate front in the same manner; The structure that described periodicity straight metal grating two ends order is connected with coupled structure and co-planar waveguide, is printed on medium substrate front;
Described artificial surface phasmon transmitter is made up of the metal unit of periodic arrangement; Described metal unit is metallic film; The shape of described metal unit is rectangle, and the length of each metal unit is all identical with width; Described metal unit is provided with the groove perpendicular to artificial surface phasmon transmitter length direction; Described groove is positioned at the homonymy of artificial surface phasmon transmitter, and the width of groove is all identical with the degree of depth.
2. a kind of tunable band-stop filter based on artificial surface phasmon as claimed in claim 1, it is characterized in that: the metal openings resonant ring (21) of described two identical loading variable capacitance diodes (22) is square aperture ring, and the opening of square aperture ring and straight metal grating slot opening staggered relatively, square aperture ring open lower side is identical with the gap of groove dual-side with groove base; By controlling the surface groove degree of depth of straight metal grating structure, width and periodically changing the dispersion curve of metal surface, design meets the metal grating structure of working frequency range.
3. as claim 2 a kind of tunable band-stop filter based on artificial surface phasmon of telling, it is characterized in that: described loading variable capacitance diode (22) is loaded into metal openings resonant ring (21) with welding manner and is formed tunable structure; Coupled structure to achieve by conventional co-planar waveguide to the efficient matchings by single conductor optical grating construction, achieves the efficient conversion between guided wave to plasmon and transmission.
4. a kind of tunable band-stop filter based on artificial surface phasmon as claimed in claim 1 or 2, it is characterized in that: the metal openings resonant ring (21) of described loading variable capacitance diode (22) is the tunable structure of sub-wavelength, two resonant ring center distance are the metal unit length of more than three integral multiples, to weaken the mutual interference between two rings.
5. a kind of tunable band-stop filter based on artificial surface phasmon as claimed in claim 1, it is characterized in that: described periodicity metal grating waveguide (1) is the monolateral metal structure having periodic grating structure, supports the high efficiency of transmission of artificial surface phasmon.
6. a kind of tunable band-stop filter based on artificial surface phasmon as claimed in claim 1, is characterized in that: described co-planar waveguide is two-conductor line structure, middle conductor and two side conductor spacing unequal, support guided wave mode.
7. a kind of tunable band-stop filter based on artificial surface phasmon as claimed in claim 1, is characterized in that: by loading DC offset voltage to variable capacitance diode, changing the resonance frequency of resonant ring, realizing band stop filter regulable center frequency.
8. a kind of tunable band-stop filter based on artificial surface phasmon as claimed in claim 1, it is characterized in that, described two waveband tunable band-stop filter is produced on medium substrate (5) in the manner of a printed circuit board, and wherein the another side of medium substrate (5) is the tabula rasa not covering copper.
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| CN105006616A (en) * | 2015-07-30 | 2015-10-28 | 上海理工大学 | Terahertz time-domain spectrum system based on ultra-wideband chip |
| CN106025462A (en) * | 2016-06-28 | 2016-10-12 | 江苏赛博防务技术有限公司 | Band elimination filter based on artificial surface plasmon and complementary split-ring resonator |
| CN106450625A (en) * | 2016-10-10 | 2017-02-22 | 东南大学 | Artificial surface plasmon wave regulating and control device with programmable design |
| CN106887659A (en) * | 2017-02-22 | 2017-06-23 | 江苏赛博防务技术有限公司 | The artificial surface phasmon transmission line of cycle loading resistor and the method for regulation dispersion and loss |
| CN109639240A (en) * | 2018-12-20 | 2019-04-16 | 电子科技大学 | Terahertz frequency multiplier based on artificial surface phasmon |
| CN109860963A (en) * | 2019-04-01 | 2019-06-07 | 哈尔滨工业大学 | Phase shifter is filtered based on the liquid crystal of pectination microstrip line and hairpin resonator array |
| CN113258240A (en) * | 2021-05-19 | 2021-08-13 | 东南大学 | Nonlinear artificial SPP waveguide for parametric amplification of multi-frequency signal waves and calculation method |
| CN113764878A (en) * | 2021-08-30 | 2021-12-07 | 西安交通大学 | Wave beam reconfigurable leaky-wave antenna |
| CN113991315A (en) * | 2021-12-27 | 2022-01-28 | 东南大学 | On-chip quadrilateral resonator based on artificial surface plasmon |
| CN114335938A (en) * | 2021-12-29 | 2022-04-12 | 杭州电子科技大学 | Miniature adjustable band-pass filter based on artificial surface plasmon |
| CN116937091A (en) * | 2023-09-19 | 2023-10-24 | 中国计量大学 | Reconfigurable band-pass filter of SSPP and SIW hybrid circuit |
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| CN105006616A (en) * | 2015-07-30 | 2015-10-28 | 上海理工大学 | Terahertz time-domain spectrum system based on ultra-wideband chip |
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| CN106450625A (en) * | 2016-10-10 | 2017-02-22 | 东南大学 | Artificial surface plasmon wave regulating and control device with programmable design |
| CN106887659A (en) * | 2017-02-22 | 2017-06-23 | 江苏赛博防务技术有限公司 | The artificial surface phasmon transmission line of cycle loading resistor and the method for regulation dispersion and loss |
| CN109639240A (en) * | 2018-12-20 | 2019-04-16 | 电子科技大学 | Terahertz frequency multiplier based on artificial surface phasmon |
| CN109860963A (en) * | 2019-04-01 | 2019-06-07 | 哈尔滨工业大学 | Phase shifter is filtered based on the liquid crystal of pectination microstrip line and hairpin resonator array |
| CN113258240A (en) * | 2021-05-19 | 2021-08-13 | 东南大学 | Nonlinear artificial SPP waveguide for parametric amplification of multi-frequency signal waves and calculation method |
| CN113764878A (en) * | 2021-08-30 | 2021-12-07 | 西安交通大学 | Wave beam reconfigurable leaky-wave antenna |
| CN113764878B (en) * | 2021-08-30 | 2023-06-06 | 西安交通大学 | Beam reconfigurable leaky-wave antenna |
| CN113991315A (en) * | 2021-12-27 | 2022-01-28 | 东南大学 | On-chip quadrilateral resonator based on artificial surface plasmon |
| CN114335938A (en) * | 2021-12-29 | 2022-04-12 | 杭州电子科技大学 | Miniature adjustable band-pass filter based on artificial surface plasmon |
| CN116937091A (en) * | 2023-09-19 | 2023-10-24 | 中国计量大学 | Reconfigurable band-pass filter of SSPP and SIW hybrid circuit |
| CN116937091B (en) * | 2023-09-19 | 2023-12-08 | 中国计量大学 | Reconfigurable band-pass filter of SSPP and SIW hybrid circuit |
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