CN114497933A - Adjustable band-stop filter with plasma-coated double-tooth-shaped structure - Google Patents
Adjustable band-stop filter with plasma-coated double-tooth-shaped structure Download PDFInfo
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- CN114497933A CN114497933A CN202210017317.0A CN202210017317A CN114497933A CN 114497933 A CN114497933 A CN 114497933A CN 202210017317 A CN202210017317 A CN 202210017317A CN 114497933 A CN114497933 A CN 114497933A
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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
- H01P1/2002—Dielectric waveguide filters
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Abstract
The invention discloses an adjustable band elimination filter with a plasma-coated double-tooth-shaped structure, and belongs to the technical field of microwave communication. The invention solves the problem that the central frequency of the filtering is not adjustable after the structure of the existing filter constructed based on the metal-dielectric-metal (MDM) waveguide configuration is determined. The invention designs a guide wave system by combining the Surface Plasmon Polariton (SPPs) theory of an MDM waveguide, wherein the guide wave system consists of plasma-silicon dioxide-plasma, silicon dioxide is in a double-tooth structure, is positioned on two sides of the central line of the waveguide and is symmetrical about the central line, and finally an adjustable band-stop filter which is coated by the plasma and has a double-tooth structure is obtained, and the filter is an ultra-wide band-stop filter which can adjust frequency near an L wave band.
Description
Technical Field
The invention relates to an adjustable band elimination filter with a plasma-coated double-tooth-shaped structure, belonging to the technical field of microwave communication.
Background
The microwave band has the advantages of penetrability, low-frequency interference resistance, wide frequency band, large capacity and the like, and is widely applied to the field of communication. The L-band is about 1 GHz-2 GHz, and has been widely used in satellite navigation and communication systems as a branch of microwave communication. Based on this, researchers have done some research work on the design of filters in this frequency band. For example, Zhao et al designs a dual circularly polarized filter antenna to realize a band-stop filtering effect near the L-band, and once the structure of the working device is fixed, the filtering characteristics cannot be adjusted. Electromagnetic parameters (such as dielectric constant, refractive index and the like) of the plasma have broadband and continuously adjustable characteristics, so that the technical development of plasma regulation and control of electromagnetic signals is particularly important. The domestic work carried out by the inventor in the application of the plasma regulation and control electromagnetic wave technology is as follows:
a filtering device combining plasma and photonic crystal concepts is provided in an adjustable plasma photonic crystal frequency-selecting filter disclosed in the domestic application number 201711472734. X. The method is characterized in that the alumina ceramic rods are arranged according to a regular hexagonal lattice, and then defects are left at the center of the photonic crystal to be introduced into the discharge plasma tube. The function of frequency selection of the filter is realized through the characteristic of continuous adjustability of the electromagnetic parameters of the plasma body. However, in practical application, there is a certain complexity in constructing the regular hexagonal crystal pattern, which provides a certain challenge for engineering implementation.
An electromagnetic signal enhancement device is proposed in a tunable, high-resolution, multi-band enhanced plasma generation device disclosed in domestic application No. 202010093055.7. The plasma-coated dipole antenna is characterized in that the multilayer plasma-coated dipole antenna realizes the enhancement of the radiation performance of electromagnetic signals in a specific frequency band by adjusting the plasma density and other parameters. But the realization of simultaneous combined regulation of multiple layers of plasma parameters also has great challenges in engineering.
The tooth-shaped structure is the most commonly used structure of the filter, because the structure is simple and the filtering mechanism is mature, the band-stop filtering near 1550nm can be realized based on the MDM type double-tooth-shaped filtering structure in the prior art; based on an MDM multi-tooth-shaped filtering structure, band elimination filtering near 1000nm can be realized. However, the filter structure is a filter constructed based on a metal-dielectric-metal waveguide configuration, and once the filter structure is determined, the center frequency, the bandwidth and the like of the filter are not adjustable. In addition, the order of magnitude of the plasma resonance frequency of the metal silver and other materials is near the light wave band range, so the frequency band regulated and controlled by the filter structures is in the light wave range.
Disclosure of Invention
The invention provides a tunable band-stop filter with a plasma-coated double-tooth structure, which aims to solve the problems in the prior art.
The technical scheme of the invention is as follows:
a tunable band-stop filter with a plasma-coated double-tooth-shaped structure comprises a shell, a plasma generating device and a silica waveguide, wherein the plasma generating device and the silica waveguide are arranged in the shell, a first port and a second port are respectively arranged on two opposite sides of the shell, and the first port and the second port are respectively connected with two ends of the silica waveguide.
Further, the silica waveguide comprises a straight waveguide and a plurality of tooth waveguides which are positioned on the same side of the straight waveguide, and the straight waveguide and the tooth waveguides are connected into a whole.
Further defined, the first port and the second port are respectively connected with two ends of the straight waveguide.
Further defined, the number of tooth waveguides is 2.
Further defined, the 2 tooth waveguides are symmetrically distributed about the center of the straight waveguide, and the distance between the center lines of the 2 tooth waveguides is d.
Further defined, the height of the straight waveguide and the length of the tooth waveguide are both w.
More specifically, w is 1 cm.
More particularly, the tooth waveguide has a height h.
Further, h is 2cm to 4 cm.
Further defined, the dielectric constant of the silicon dioxide waveguide is 2.1, and the frequency of the plasma generated by the plasma generating device is 8 GHz-12 GHz.
The invention has the following beneficial effects:
the invention expands the MDM waveguide SPPs theory of the light wave frequency band to the plasma field of the microwave frequency band, designs a guided wave system consisting of plasma-silicon dioxide-plasma, obtains an adjustable band-stop filter with a plasma-coated dual-tooth-shaped structure, and solves the problem that the central frequency, the bandwidth and the like of the filtering are not adjustable after the structure of the filter constructed based on the metal-medium-metal waveguide configuration is determined. In addition, the invention also has the following advantages:
(1) the technical scheme of the filter for processing the electric wave signals is brand new, and is different from the technical ideas of plasmas, photonic crystals or metamaterials, and the structure is extremely simple.
(2) The filter of the invention can generate a band-stop transmission spectrum of an ultra-wideband which is nearly U-shaped, the stop band is extremely flat, and the transmission rate is close to zero.
(3) The filter can effectively control the center frequency and the bandwidth of the filter device by adjusting the height of the tooth-shaped cavity, and the dynamic adjustability of the center frequency can be realized by changing the plasma frequency (density) on the premise of hardly changing the filter bandwidth.
(4) The technical route of the invention is the extension of the SPPs theory of the optical band MDM waveguide, so that the invention has a very mature theoretical system to support the subsequent development, and meanwhile, the proposal of the plasma-silicon dioxide-plasma guided wave system concept has great inspiring significance for modulating electromagnetic signals by plasmas.
Drawings
FIG. 1 is a schematic diagram of a two-dimensional structure of a plasmon-silica-plasmon guided wave system of a filter according to the present invention;
FIG. 2 is a comparison graph of transmission spectra and corresponding field amplitude distributions of a single tooth waveguide structure and a double tooth waveguide structure;
FIG. 3 is a U-shaped stop band spectrum of the double-tooth waveguide structure under different tooth height parameters;
FIG. 4 is a graph showing the variation trend of the center frequency and the bandwidth of the double-tooth waveguide structure under different tooth height parameters;
FIG. 5 is a U-shaped band impedance spectrum of a double-tooth waveguide structure at different plasma frequencies;
FIG. 6 is a graph showing the variation trend of the center frequency and the bandwidth of the double-tooth waveguide structure at different plasma frequencies.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The experimental procedures used in the following examples are conventional unless otherwise specified. The materials, reagents, methods and apparatus used, unless otherwise specified, are conventional in the art and are commercially available to those skilled in the art.
Example 1:
the plasmon-silica-plasmon guided wave system of the filter of the present embodiment is shown in fig. 1, the tooth wave derivative quantity is 2, and the parameters are set as follows: d 3cm, h 3cm, w 1cm, plasma frequency fpe10GHz (corresponding to a plasma density of 1.2404 × 10)18/m3) The collision frequency v is 0.01GHz, the dielectric constant of silicon dioxide is 2.1, and the dielectric constant of plasma is calculated by the de-rod algorithm, and the calculation formula is as follows:
wherein, fpe＝ωpeAnd the collision frequency v of 10GHz is 0.01GHz, omega is the angular frequency of the electromagnetic signal, and i is an imaginary number unit.
Comparative example 1:
the present comparative example differs from example 1 in that the number of tooth waveguides is 1, and the parameters are set as follows: h is 3cm and w is 1cm, and the other parameter settings are the same as in example 1.
Example of effects:
the transmission response of the guided wave systems of the embodiment 1 and the comparative example 1 is calculated by adopting a finite element method, when an electromagnetic wave enters a port I, a microwave signal can excite SPPs at a plasma-medium interface, the SPPs are transmitted along a silica channel, a resonance effect of a tooth-shaped cavity is utilized to prevent an electromagnetic signal with a specific frequency from being output to a port II, the initial power A of the incident electromagnetic wave is recorded at the port I, the residual power B of the output electromagnetic wave is collected at the port II, and the transmission rate refers to the ratio of the residual power to the initial power, namely T is B/A.
The transmission spectra of the waveguide structures of the single/double tooth cavity of comparative example 1 and example 1 are shown in fig. 2, and it can be seen from fig. 2 that the transmission spectrum of the single tooth cavity structure exhibits a resonance valley and the resonance frequency is 1.045 GHz. The inset in FIG. 2 is a field magnitude plot of the resonant frequency, indicating that the transmission valleys are formed by destructive interference of SPPs; the transmission spectrum of the double-tooth cavity structure has an ultra-flat stop band characteristic, and compared with a single tooth, the transmission spectrum is a relatively flat U-shaped filter spectrum.
The specification of the filter is characterized by a bandwidth and a center frequency, wherein the bandwidth refers to the width (f) of a frequency range with a stop band transmission rate lower than 0.012-f1)，f1(f2) Is a frequency value at which the transmission rate is 0.01 at low (high) frequencies; the center frequency is (f)2+f1)/2. The center frequency and bandwidth of the double-tooth cavity waveguide structure are 1.055GHz and 0.27GHz, respectively, and the insets are field patterns at low frequency, center frequency, and high frequency, indicating that these near-zero transmission rates are caused by destructive interference of the enhanced SPPs.
And it can be seen from fig. 2 that the center frequency of the band-stop filter supported by the double-tooth cavity structure is almost equal to the resonant frequency of the single-tooth cavity.
In summary, the double-tooth waveguide structure can realize the typical U-shaped band-impedance filtering, and the center frequency is almost equal to the resonance frequency of the single-tooth structure.
Example 2:
the resonant frequency is related to the tooth profile height, so theoretically, the center frequency of band-stop filtering is different for different tooth profile cavity heights, and the difference between the embodiment and the embodiment 1 is as follows: h is 2cm, 2.5cm, 3.5cm or 4cm, and the rest of the parameter settings are the same as in example 1. The transmission spectrum in the 0.2 GHz-2 GHz band is shown in fig. 3, and the increase of the tooth profile height can be seen, so that the U-band rejection filter spectrum can be moved to the low frequency as a whole. Fig. 4 shows the central frequency and bandwidth of the filtered spectrum of fig. 3, and it can be seen that as the height of the tooth-shaped cavity increases, the central frequency of the filtered spectrum shifts to low frequencies, and the bandwidth of the filtering gradually decreases.
Example 3:
the plasma frequency is a function of the plasma density, the plasma density is flexibly adjustable in a real engineering environment, and the plasma density can be realized by adjusting the discharge air pressure, the current and the like of the plasma generating device, and the embodiment is different from the embodiment in that: plasma frequency fpeAt 8GHz, 9GHz, 11GHz or 12GHz, and the parameter value corresponding to the plasma density is 7.9388 × 1017/m3、1.0048×1018/m3、1.5009×1018/m3、1.7862×1018/m3The rest of the parameter settings were the same as in example 1. The transmission spectrum in the 0.2 GHz-2 GHz band is shown in fig. 5, and the increase of the plasma frequency can shift the U-band rejection spectrum to a high frequency as a whole. Fig. 6 shows the extraction of the center frequency and bandwidth of the filter spectrum of fig. 5, and it can be seen that the increase in plasma frequency causes the center frequency of the filter spectrum to shift to higher frequencies, but the bandwidth of the filter fluctuates slightly (it can be seen that the bandwidth is hardly changed).
Claims (10)
1. A tunable band-stop filter with a plasma-coated double-tooth-shaped structure is characterized by comprising a shell, a plasma generating device and a silica waveguide, wherein the plasma generating device and the silica waveguide are arranged in the shell, a first port and a second port are respectively arranged on two opposite sides of the shell, and the first port and the second port are respectively connected with two ends of the silica waveguide.
2. The tunable bandstop filter according to claim 1, wherein the silica waveguide comprises a straight waveguide and a plurality of tooth waveguides located on the same side of the straight waveguide, and the straight waveguide and the plurality of tooth waveguides are integrally connected.
3. The tunable band-stop filter with a plasma-coated double-tooth structure as claimed in claim 2, wherein the first port and the second port are respectively connected to two ends of the straight waveguide.
4. The tunable band-stop filter of a plasma-coated double-tooth structure as claimed in claim 2, wherein the number of the tooth waveguides is 2.
5. The tunable bandstop filter with a plasma cladding double tooth structure as claimed in claim 4, wherein the 2 tooth waveguides are symmetrically distributed about the center of the straight waveguide, and the distance between the center lines of the 2 tooth waveguides is d.
6. The tunable band-stop filter with a plasma-coated double-tooth structure as claimed in claim 2, wherein the height of the straight waveguide and the length of the tooth waveguide are both w.
7. The tunable band-stop filter with a plasma-coated double-tooth structure as claimed in claim 6, wherein w is 1 cm.
8. The tunable band-stop filter with a plasma-coated double-tooth structure as claimed in claim 5, wherein d is 3 cm.
9. The tunable band-stop filter with a plasma-coated double-tooth structure according to claim 2, wherein the height of the tooth waveguide is h, and h is 2 cm-4 cm.
10. The tunable band-stop filter with a plasma-coated double-tooth structure according to claim 1, wherein the dielectric constant of the silica waveguide is 2.1, and the frequency of plasma generated by the plasma generating device is 8 GHz-12 GHz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210017317.0A CN114497933B (en) | 2022-01-07 | 2022-01-07 | Adjustable band-stop filter with plasma cladding double-tooth-shaped structure |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103022625A (en) * | 2012-11-20 | 2013-04-03 | 深圳光启创新技术有限公司 | Harmonic oscillator as well as cavity filter and electromagnetic wave equipment thereof |
| CN103682532A (en) * | 2013-12-12 | 2014-03-26 | 北京理工大学 | Electromagnetic wave multi-band filter with side micro-cavities and metal-medium-metal waveguide coupled |
| CN104635298A (en) * | 2015-02-11 | 2015-05-20 | 深圳太辰光通信股份有限公司 | Planar optical waveguide and manufacturing method thereof |
| EP3200271A1 (en) * | 2016-01-29 | 2017-08-02 | Northrop Grumman Systems Corporation | Voltage controlled tunable filter |
| WO2017140147A1 (en) * | 2016-02-15 | 2017-08-24 | 深圳大学 | Ultra high-resolution temperature sensor on the basis of external liquid capsule and fixed wavelength |
| CN107526855A (en) * | 2016-06-22 | 2017-12-29 | 南京理工大学 | Analyze the golden time-domain finite element method of discontinuous gal the Liao Dynasty of uncertain plasma characteristics |
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- 2022-01-07 CN CN202210017317.0A patent/CN114497933B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103022625A (en) * | 2012-11-20 | 2013-04-03 | 深圳光启创新技术有限公司 | Harmonic oscillator as well as cavity filter and electromagnetic wave equipment thereof |
| CN103682532A (en) * | 2013-12-12 | 2014-03-26 | 北京理工大学 | Electromagnetic wave multi-band filter with side micro-cavities and metal-medium-metal waveguide coupled |
| CN104635298A (en) * | 2015-02-11 | 2015-05-20 | 深圳太辰光通信股份有限公司 | Planar optical waveguide and manufacturing method thereof |
| EP3200271A1 (en) * | 2016-01-29 | 2017-08-02 | Northrop Grumman Systems Corporation | Voltage controlled tunable filter |
| WO2017140147A1 (en) * | 2016-02-15 | 2017-08-24 | 深圳大学 | Ultra high-resolution temperature sensor on the basis of external liquid capsule and fixed wavelength |
| CN107526855A (en) * | 2016-06-22 | 2017-12-29 | 南京理工大学 | Analyze the golden time-domain finite element method of discontinuous gal the Liao Dynasty of uncertain plasma characteristics |
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