CN110011007B - Band elimination filter based on artificial surface plasmon transmission line - Google Patents
Band elimination filter based on artificial surface plasmon transmission line Download PDFInfo
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- CN110011007B CN110011007B CN201910212736.8A CN201910212736A CN110011007B CN 110011007 B CN110011007 B CN 110011007B CN 201910212736 A CN201910212736 A CN 201910212736A CN 110011007 B CN110011007 B CN 110011007B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/2039—Galvanic coupling between Input/Output
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Abstract
The invention discloses a band elimination filter based on an artificial surface plasmon transmission line, relates to a strip line filter, and belongs to the technical field of basic electric elements. The filter is arranged on a dielectric substrate, only one surface of the dielectric substrate is provided with a metal conduction band circuit, the artificial surface plasmon transmission line is used as a main transmission line, the quarter-wavelength open stub is used as a resonator, and a mode conversion circuit and an impedance matching circuit are respectively arranged on an input/output port, so that the mode conversion and impedance matching functions from a coplanar waveguide TEM mode to an artificial surface plasmon transmission line TM mode are realized. The artificial surface plasmon polariton transmission line is low in radiation loss, does not need to use a shielding box body, can be used in a free space, reduces the production cost and is convenient to use. The slow wave effect of the artificial surface plasmon shortens the total length of the main transmission line, thereby reducing the total length of the filter. In addition, the filter has a wider stop band bandwidth.
Description
Technical Field
The invention discloses a band elimination filter based on an artificial surface plasmon transmission line, relates to a strip line filter, and belongs to the technical field of basic electric elements.
Background
With the rapid development of the artificial surface plasmon transmission line, researchers find that the artificial surface plasmon transmission line can be applied to the design and circuit integration of microwave devices. The band elimination filter, which is an important device in microwave devices, has the functions of suppressing interference signals and transmitting useful signals. The existing filters such as microstrip filters and cavity filters often need metal shielding, otherwise, the radiation loss is high, so that the size is large, the cost is high, and the use is inconvenient sometimes. The constraint of the artificial Surface plasmon transmission line on the electromagnetic field enables a filter realized based on the artificial Surface plasmon transmission line to be free of metal shielding or metal grounding, and meanwhile, the slow wave effect of the artificial Surface plasmon can effectively shorten the total length of the band filter, so that filters realized through the artificial Surface plasmon polariton are increasing, and the existing band-stop filter based on an SSPP (spherical Surface plasmon polaritons) structure has the defect of relatively narrow bandwidth.
Disclosure of Invention
The invention aims to overcome the defects of the background technology, provides a band elimination filter based on an artificial surface plasmon transmission line, can be used in a free space, has a relatively small size, enhances the bandwidth, and solves the technical problem that the conventional band elimination filter based on an SSPP structure has a relatively narrow bandwidth.
The invention adopts the following technical scheme for realizing the aim of the invention:
band elimination filter based on artifical surface plasmon transmission line includes:
a main transmission line having a periodic structure composed of a plurality of artificial surface plasmons,
a plurality of resonators loaded on the main transmission line, each resonator being connected to the protrusion of the artificial surface plasmon on the main transmission line, each resonator being an open stub of a quarter wavelength, an electrical length between adjacent two open stubs being less than 90 degrees at a center frequency of the filter,
a mode conversion circuit connected to the signal input terminal of the main transmission line for converting the TEM mode of the coplanar waveguide into the TM mode of the main transmission line, and,
and the impedance matching circuit is connected with the signal output end of the main transmission line and is used for matching the impedance of the output signal of the main transmission line and the transmission signal of the coplanar waveguide.
As a further optimization scheme of the band elimination filter based on the artificial surface plasmon transmission line, the artificial surface plasmon is in a comb-shaped or fishbone-shaped or domino structure.
As a further optimization scheme of the band-stop filter based on the artificial surface plasmon transmission line, the open stub with the quarter wavelength is a metal strip with a single-sided structure.
As a further optimization scheme of the band-stop filter based on the artificial surface plasmon transmission line, the open stub of a quarter wavelength is an open stub having a horizontal part and a vertical part of the same length after being folded.
As a further optimization scheme of the band elimination filter based on the artificial surface plasmon transmission line, the mode conversion circuit and the impedance matching circuit have the same structure and respectively comprise the transmission line formed by the artificial surface plasmon with gradually changed groove depth and the fan-shaped structure waveguides symmetrically distributed on two sides of the transmission line.
As a further optimization scheme of the band-stop filter based on the artificial surface plasmon transmission line, in the mode conversion circuit, the depth of the artificial surface plasmon groove is increased along the signal propagation direction.
As a further optimization scheme of the band elimination filter based on the artificial surface plasmon transmission line, in the impedance matching circuit, the depth of the artificial surface plasmon groove is decreased progressively along the signal propagation direction.
The band elimination filter based on the artificial surface plasmon transmission line is realized by a metal conduction band circuit formed by etching a dielectric substrate by laser.
By adopting the technical scheme, the invention has the following beneficial effects: this application comprehensive utilization artificial surface plasmon's slow wave effect and stub form filter's performance advantage, the syntonizer through the stub form effectively improves relative bandwidth, utilize artificial surface plasmon's slow wave effect to shorten band filter length, effectively reduce band elimination filter's total size, the strong constraint nature of the artifical surface plasmon transmission line of full play to the electromagnetic field, metal shielding box body and metal ground have been saved, can use at free space, it is little to have the loss, low cost, the total volume is little, the advantage of stop band bandwidth broad.
Drawings
Fig. 1 is a structural diagram of a band elimination filter based on an artificial surface plasmon transmission line.
Fig. 2 is a periodic circuit structure of an artificial surface plasmon transmission line.
Fig. 3 is a dispersion curve diagram of an artificial surface plasmon transmission line.
Fig. 4 is a block diagram of a mode conversion circuit/impedance matching circuit.
Fig. 5 is a simulation graph of the S parameter of the band-stop filter based on the artificial surface plasmon transmission line.
The reference numbers in the figures illustrate: 1. main transmission line, 2, resonator, 3, mode conversion circuit, 4, impedance matching circuit.
Detailed Description
The technical scheme of the invention is explained in detail in the following with reference to the attached drawings.
The band elimination filter based on the artificial surface plasmon transmission line comprises a main transmission line 1, two resonators 2 loaded on the main transmission line, a mode conversion circuit 3 connected to an input port and an impedance matching circuit 4 connected to an output port, wherein the electrical length between the two resonators is smaller than 90 degrees of the center frequency of the filter, as shown in figure 1. The artificial surface plasmon transmission line is used as a main transmission line, and the resonator is an open stub with a quarter wavelength. The mode conversion circuit is used for realizing the function of mode conversion from the coplanar waveguide TEM mode to the artificial surface plasmon transmission line TM mode. The mode conversion circuit and the impedance matching circuit have the same structure, and as shown in fig. 4, both include an artificial surface plasmon transmission line with gradually changed size and fan-shaped waveguide structures symmetrically distributed on both sides of the transmission line. The band elimination filter shown in fig. 1 is realized by a conduction band circuit formed by laser etching a metal thin film on a dielectric substrate, and a metal ground is not required.
As shown in fig. 2, the metal conduction band of the artificial surface plasmon transmission line is a periodic structure, specifically, a metal conduction band which is formed by a single surface plasmon with a length of D, a groove width of S, and a groove depth of G and has a groove and a protrusion periodically, and a base height of the metal conduction band is L.
Dispersion curves of the coplanar waveguide and the artificial surface plasmon transmission line of three different groove depths are shown in fig. 3, where k is a phase coefficient of the transmission line, and a kD value of the artificial surface plasmon transmission line has a nonlinear relationship with frequency. The kD value of each artificial surface plasmon transmission line tends to pi along with the increase of frequency, the frequency point when the kD reaches pi is a cut-off frequency point, and after the cut-off frequency is exceeded, the transmission line is cut off, and signals cannot pass through. It can be seen that the cutoff frequency of the artificial surface plasmon transmission line becomes lower as the groove depth increases.
As shown in fig. 4, the mode conversion circuit includes an artificial surface plasmon transmission line with gradually increasing groove depth and sector structures distributed on two sides of the transmission line, and as the distance between the artificial surface plasmon transmission line with gradually increasing groove depth and the sector structures on two sides gradually increases, the transmission mode of the electromagnetic signal is converted from the quasi-TEM mode to the TM mode, thereby realizing the mode conversion function of the filter at the port. The impedance matching circuit has the same structure as the impedance matching circuit, and is different from the impedance matching circuit in that the impedance matching circuit comprises an artificial surface plasmon transmission line with the gradually decreased groove depth and fan-shaped structures distributed on two sides of the transmission line, and the impedance matching function of the filter is realized along with the gradually decreased distance between the artificial surface plasmon transmission line with the gradually decreased groove depth and the fan-shaped structures on two sides.
The invention provides a design example of a band-stop filter based on an artificial surface plasmon transmission line.
The dielectric plate selected by the filter is Rogers 5880, the relative dielectric constant is 2.2, the thickness is 0.254mm, and the length and the width are 172mm and 72mm respectively. The length D of the single artificial surface plasmon polariton is 6mm, the groove depth G is 4mm, the groove width S is 3mm, and the base L is 2 mm. The two folded quarter-wave open stubs are separated by 8 SSPP unit structures. In order to reduce the overall size of the band-stop filter, the quarter-wavelength open-circuit stub is folded into a horizontal part and a vertical part, the length of the horizontal part is 40mm, the length of the vertical part is 40mm, and the width of the vertical part is 4 mm. The mode conversion circuit and the impedance matching circuit are composed of artificial surface plasmon transmission lines with gradually changed sizes and fan-shaped structures distributed on two sides, wherein the length of each fan-shaped structure is 40mm, the width of each fan-shaped structure is 20mm, and edge curves are exponential function curves. In the mode conversion circuit, the artificial surface plasmon polariton transmission line with gradually changed size has four SSPP units, the groove depths of the four SSPP units are sequentially increased from 0.8mm to 3.2mm, and the step length is 0.8 mm.
Curves S11 and S21 of the filter obtained through electromagnetic field simulation are shown in FIG. 5, and the center frequency f of the artificial surface plasmon transmission line band-stop filter01GHz, band stop bandwidth BW 0.5GHz, relative bandwidth50％。
In summary, the application comprehensively utilizes the slow wave effect of the artificial surface plasmon and the performance advantages of the stub type filter, and realizes the band-stop filter with small loss, small size and wider stop band bandwidth through the metal conduction band circuit with the single-sided circuit structure; compared with the conventional band-stop filter based on the SSPP structure, the relative bandwidth is effectively improved through the resonators in the stub line mode; compared with a stub band-stop filter, the length of the main transmission line is shortened by utilizing the slow wave effect of the artificial surface plasmon polariton, the total size of the band-stop filter is effectively reduced, the strong constraint of the artificial surface plasmon polariton transmission line on an electromagnetic field is fully exerted, a metal shielding box body and metal grounding are omitted, the band-stop filter can be used in a free space, the loss is small, and the cost is low.
Claims (8)
1. Band elimination filter based on artifical surface plasmon transmission line, its characterized in that includes:
a main transmission line having a periodic structure composed of a plurality of artificial surface plasmons,
a plurality of resonators loaded on the main transmission line, each resonator being connected to the protrusion of the artificial surface plasmon on the main transmission line, each resonator being an open stub of a quarter wavelength, an electrical length between adjacent two open stubs being less than 90 degrees at a center frequency of the filter,
a mode conversion circuit connected to the signal input terminal of the main transmission line for converting the TEM mode of the coplanar waveguide into the TM mode of the main transmission line, and,
and the impedance matching circuit is connected with the signal output end of the main transmission line and is used for matching the impedance of the output signal of the main transmission line and the transmission signal of the coplanar waveguide.
2. The band-stop filter based on the artificial surface plasmon transmission line of claim 1, wherein the artificial surface plasmon is in a comb-type or fishbone-shaped or domino structure.
3. The artificial surface plasmon transmission line based band stop filter of claim 1, wherein said quarter wavelength open stub is a single-sided structured metal strip.
4. The artificial surface plasmon transmission line based band stop filter of claim 1, wherein said quarter wavelength open stub is an open stub having horizontal and vertical portions of the same length after folding.
5. The band elimination filter based on artificial surface plasmon transmission line of claim 1, wherein the mode conversion circuit and the impedance matching circuit have the same structure and both comprise transmission line composed of artificial surface plasmon with gradually changed groove depth and sector structure waveguides symmetrically distributed on both sides of the transmission line.
6. The band reject filter based on artificial surface plasmon transmission line of claim 5, wherein in the mode conversion circuit the depth of the artificial surface plasmon grooves increases progressively along the signal propagation direction.
7. The band reject filter based on artificial surface plasmon transmission line of claim 5, wherein in the impedance matching circuit the depth of the artificial surface plasmon groove decreases progressively along the signal propagation direction.
8. The band-stop filter based on the artificial surface plasmon transmission line according to any of the claims 1 to 7, characterized in that the band-stop filter is realized by a metal conduction band circuit formed by laser etching of a dielectric substrate.
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| CN114639966A (en) * | 2022-05-17 | 2022-06-17 | 中国计量大学 | Programmable artificial surface plasmon polariton wave regulation and control device and control method |
| CN115939717B (en) * | 2022-10-31 | 2024-03-29 | 电子科技大学 | Terahertz planar waveguide magic T based on novel transmission line load |
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| US3813669A (en) * | 1972-03-27 | 1974-05-28 | Kidde & Co Walter | Frequency filter circuit apparatus |
| CN104269594A (en) * | 2014-09-24 | 2015-01-07 | 上海大学 | Planar compact type multi-channel wave splitter based on imitative surface plasmons |
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| EP3373387A2 (en) * | 2017-03-10 | 2018-09-12 | Synergy Microwave Corporation | Microelectromechanical switch with metamaterial contacts |
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| CN105006616B (en) * | 2015-07-30 | 2018-11-20 | 上海理工大学 | A kind of THz wave time-domain spectral system based on ultra-wideband chip |
| CN105655672B (en) * | 2016-01-20 | 2018-06-15 | 东南大学 | Bandstop filter and its stopband introducing method based on artificial surface phasmon |
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Patent Citations (4)
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|---|---|---|---|---|
| US3813669A (en) * | 1972-03-27 | 1974-05-28 | Kidde & Co Walter | Frequency filter circuit apparatus |
| CN104269594A (en) * | 2014-09-24 | 2015-01-07 | 上海大学 | Planar compact type multi-channel wave splitter based on imitative surface plasmons |
| CN104810580A (en) * | 2015-05-12 | 2015-07-29 | 中国矿业大学 | Inclined seam separating type multi-band band elimination filter for artificial surface plasmons |
| EP3373387A2 (en) * | 2017-03-10 | 2018-09-12 | Synergy Microwave Corporation | Microelectromechanical switch with metamaterial contacts |
Non-Patent Citations (2)
| Title |
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| Novel non-periodic spoof surface plasmon polaritons with H-shaped cells and its application to high selectivity wideband bandpass filter;Xin Gao等;《Scientific Reports》;20180206;第20-29页 * |
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