CN111009707A - high-Q-value radio frequency band elimination filter based on two-dimensional photonic crystal - Google Patents
high-Q-value radio frequency band elimination filter based on two-dimensional photonic crystal Download PDFInfo
- Publication number
- CN111009707A CN111009707A CN201911277904.8A CN201911277904A CN111009707A CN 111009707 A CN111009707 A CN 111009707A CN 201911277904 A CN201911277904 A CN 201911277904A CN 111009707 A CN111009707 A CN 111009707A
- Authority
- CN
- China
- Prior art keywords
- filter
- circular dielectric
- radio frequency
- filter body
- frequency band
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- H01P1/20309—Strip line filters with dielectric resonator
Abstract
The invention discloses a high-Q-value radio frequency band elimination filter based on two-dimensional photonic crystals, which comprises a filter body, wherein the filter body adopts a lattice structure; the filter body is provided with a linear waveguide which is horizontally arranged and penetrates through the center of the filter body, wherein one end of the linear waveguide is an input port of the band elimination filter, and the other end of the linear waveguide is an output port of the band elimination filter; the filter comprises a filter body, wherein a resonant cavity and a plurality of rows of first circular dielectric columns are arranged on the filter body, the resonant cavity is arranged in the middle of one row of the first circular dielectric columns, the first circular dielectric columns in the resonant cavity are replaced by a plurality of second circular dielectric columns which are continuously arranged and meet the lattice mismatch constant, the distance between the first circular dielectric columns is the first lattice constant, and the distance between the second circular dielectric columns is the second lattice constant. The advantages are that: the invention has the advantages of small size, high quality factor and low insertion loss, and has important application value in the aspects of wireless communication technology and the like.
Description
Technical Field
The invention relates to a high-Q-value radio frequency band elimination filter based on two-dimensional photonic crystals, and belongs to the technical field of microwave photonic crystal filters.
Background
With the development of broadband and ultra-wideband communication systems, because a band-stop filter can effectively suppress unnecessary broadband signals, the research of a high-performance radio frequency band-stop filter is very important, the band-stop filter is often used for filtering interference components mixed in useful signals in the microwave fields of wireless communication, radar systems, testing and the like, and compared with a band-pass filter, the band-stop filter has the advantages of large bearing power, low insertion loss and the like, and the band-stop filter can be used in places where narrow-band signals in a specified frequency band need high attenuation and can also play a role in the aspects of electromagnetic compatibility system testing and the like. For the design of the traditional band-stop filter, a strip line or a waveguide structure is often adopted for realization, but no matter which structure is adopted, parameters such as the stopband attenuation and the quality factor of the designed band-stop filter cannot meet the high performance requirement easily.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a high-Q-value radio frequency band elimination filter based on two-dimensional photonic crystals.
In order to solve the technical problem, the invention provides a high-Q-value radio frequency band elimination filter based on two-dimensional photonic crystals, which comprises a filter body, wherein the filter body adopts a lattice structure;
the filter body is provided with a linear waveguide which is horizontally arranged and penetrates through the center of the filter body, wherein one end of the linear waveguide is an input port of the band elimination filter, and the other end of the linear waveguide is an output port of the band elimination filter;
the filter comprises a filter body, wherein a resonant cavity and a plurality of rows of first circular dielectric columns are arranged on the filter body, the resonant cavity is arranged in the middle of one row of the first circular dielectric columns, the first circular dielectric columns in the resonant cavity are replaced by a plurality of second circular dielectric columns which are continuously arranged and meet the lattice mismatch constant, the distance between the first circular dielectric columns is the first lattice constant, and the distance between the second circular dielectric columns is the second lattice constant.
Further, the tetragonal structure adopts a photonic crystal structure, and the first lattice constant is 600 um.
Furthermore, a plurality of first circular dielectric columns are arranged on the filter body in a rectangular shape.
Furthermore, the materials of the first circular dielectric column and the second circular dielectric column are silicon, and the refractive indexes of the first circular dielectric column and the second circular dielectric column are the same and are 3.41425-3.4145.
Further, the radius of the first circular medium column is 108 um.
Furthermore, the radius of the second round medium column is 79.6-80.4 um.
Further, the second lattice constant is 480 um.
Further, the background medium of the filter body is air.
The invention achieves the following beneficial effects:
the band elimination filter of the invention introduces an AAH (Aubry-Andre-Harper) resonant cavity, wherein the lattice constant of the resonant cavity meets the lattice mismatch constant in an AAH model; the coupling coefficient is increased by changing the distance L between the AAH cavity and the main waveguide, so that the attenuation of a stop band of the device becomes higher; the invention has the advantages of small size, high quality factor and low insertion loss, and has important application value in the aspects of wireless communication technology and the like.
Drawings
FIG. 1 is a high Q-factor RF band-stop filter based on two-dimensional photonic crystals according to the present invention;
FIG. 2 is a perspective view of a high Q-factor radio frequency band reject filter based on two-dimensional photonic crystals according to the present invention;
FIG. 3 is a graph showing a stable intensity profile when the input wavelength satisfies the resonant frequency according to the present invention;
FIG. 4 is a schematic diagram of a side-coupled single resonator filter;
fig. 5 is a filter transmission spectrum at a distance L =3a of the AAH cavity and the main waveguide;
fig. 6 is a filter transmission spectrum at a distance L =2a of the AAH cavity and the main waveguide;
fig. 7 is a filter transmission spectrum at a distance L = a of the AAH cavity and the main waveguide.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, 2, 3 and 4, a two-dimensional photonic crystal-based high-Q radio frequency band reject filter includes: the filter body is provided with a linear waveguide and a resonant cavity, the filter body adopts a square photonic lattice structure, the filter body is provided with first circular dielectric columns 1 in rectangular arrangement, the radius of the first circular dielectric columns is 108um, and a first lattice constant between the first circular dielectric columns is 600 um.
The linear waveguide 2 is formed by removing a row of first-type circular dielectric columns in the filter body, the width of the linear waveguide is 1200um, the left side of the linear waveguide is an input port 5, and the right side of the linear waveguide is an output port 6.
The resonant cavity 3 is provided with four continuously arranged second-type circular dielectric columns 4 meeting the lattice mismatch constant, and the radius of the second-type circular dielectric columns is 80 um. The second lattice constant among the second type of circular dielectric columns is 480 um. The first-class circular dielectric column and the second-class circular dielectric column are made of Si, and the refractive index is 3.41. The background material is air, and the refractive index is 1.
Example 1:
after a radio-frequency signal in a certain frequency range enters the filter from the left input port 5, most of electromagnetic waves input into the linear waveguide are coupled to the resonant cavity and energy is totally reflected back only when the resonance frequency is consistent with the resonance frequency of the circular ring-shaped resonant cavity; when the frequency of the electromagnetic wave input into the linear waveguide is different from the resonant frequency of the circular ring-shaped resonant cavity, the electromagnetic wave input into the linear waveguide passes through the resonant cavity and is output from the output port 6 of the output linear waveguide, and when the distance between the AAH cavity and the main waveguide is L =600um, the resonant wavelength of the resonant cavity is 1668.3um at the moment, and the energy is totally reflected back. The rest wavelengths are not matched with the resonant cavity frequency and all pass through; therefore, the band elimination characteristic is realized, and the purpose of filtering interference signals doped in useful signals is achieved.
Based on the structural model established by simulation software, the filtering process is simulated and calculated, and the transmission spectrogram of the filter can be obtained by changing the distance between the AAH cavity and the main waveguide as shown in fig. 5, 6 and 7, as shown in fig. 5, when the distance between the AAH resonant cavity and the main waveguide is 1800um, the resonant wavelength of the transmission peak is 1665.93um, the stopband attenuation is 0.8dB, and the insertion loss is 0.04 dB. As shown in fig. 6, when the distance between the AAH resonator and the main waveguide is 1200um, the resonant wavelength of the transmission peak is 1665.93um, the attenuation of the stop band is 7.7dB, and the insertion loss is 0.04 dB. As shown in fig. 7, when the distance between the AAH resonator and the main waveguide is 600um, the resonance wavelength of the transmission peak is 1668.3um, the stop band attenuation is 30dB, and the insertion loss is 0.04 dB.
The band elimination filter of the invention introduces an AAH (Aubry-Andre-Harper) resonant cavity, wherein the lattice constant of the resonant cavity meets the lattice mismatch constant in an AAH model; the coupling coefficient is increased by changing the distance L between the AAH cavity and the main waveguide, so that the attenuation of a stop band of the device becomes higher; the invention has the advantages of small size, high quality factor and low insertion loss, and has important application value in the aspects of wireless communication technology and the like.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A high-Q-value radio frequency band elimination filter based on two-dimensional photonic crystals comprises a filter body and is characterized in that the filter body adopts a lattice structure;
the filter body is provided with a linear waveguide which is horizontally arranged and penetrates through the center of the filter body, wherein one end of the linear waveguide is an input port of the band elimination filter, and the other end of the linear waveguide is an output port of the band elimination filter;
the filter comprises a filter body, wherein a resonant cavity and a plurality of rows of first circular dielectric columns are arranged on the filter body, the resonant cavity is arranged in the middle of one row of the first circular dielectric columns, the first circular dielectric columns in the resonant cavity are replaced by a plurality of second circular dielectric columns which are continuously arranged and meet the lattice mismatch constant, the distance between the first circular dielectric columns is the first lattice constant, and the distance between the second circular dielectric columns is the second lattice constant.
2. The two-dimensional photonic crystal-based high-Q radio frequency band reject filter according to claim 1, wherein the tetragonal lattice structure adopts a photonic crystal structure, and the first lattice constant is 600 um.
3. The two-dimensional photonic crystal-based high-Q radio frequency band reject filter according to claim 1, wherein a plurality of the first circular dielectric pillars are arranged on the filter body in a rectangular shape.
4. The two-dimensional photonic crystal based high-Q radio frequency band-stop filter according to claim 1, wherein the first and second circular dielectric pillars are made of silicon and have the same refractive index of 3.41425-3.4145.
5. The two-dimensional photonic crystal-based high-Q radio frequency band reject filter of claim 1, wherein the radius of the first circular dielectric cylinder is 108 um.
6. The two-dimensional photonic crystal-based high-Q radio frequency band reject filter of claim 1, wherein the radius of the second circular dielectric cylinder is 79.6-80.4 um.
7. The two-dimensional photonic crystal-based high-Q radio frequency band reject filter of claim 1, wherein the second lattice constant is 480 um.
8. The two-dimensional photonic crystal-based high-Q radio frequency band reject filter of claim 1, wherein the background medium of the filter body is air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911277904.8A CN111009707A (en) | 2019-12-12 | 2019-12-12 | high-Q-value radio frequency band elimination filter based on two-dimensional photonic crystal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911277904.8A CN111009707A (en) | 2019-12-12 | 2019-12-12 | high-Q-value radio frequency band elimination filter based on two-dimensional photonic crystal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111009707A true CN111009707A (en) | 2020-04-14 |
Family
ID=70115441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911277904.8A Pending CN111009707A (en) | 2019-12-12 | 2019-12-12 | high-Q-value radio frequency band elimination filter based on two-dimensional photonic crystal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111009707A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112394440A (en) * | 2020-10-28 | 2021-02-23 | 中通服咨询设计研究院有限公司 | Radio frequency band-pass filter based on two-dimensional photonic crystal |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5389943A (en) * | 1991-02-15 | 1995-02-14 | Lockheed Sanders, Inc. | Filter utilizing a frequency selective non-conductive dielectric structure |
| CN101881918A (en) * | 2010-05-25 | 2010-11-10 | 南京邮电大学 | Terahertz wave modulator based on nonlinear photonic crystal and modulating method |
| WO2013090177A1 (en) * | 2011-12-12 | 2013-06-20 | The Trustees Of Columbia University In The City Of New York | Systems and methods for suspended polymer photonic crystal cavities and waveguides |
| CN103180973A (en) * | 2010-11-02 | 2013-06-26 | 皇家飞利浦电子股份有限公司 | Iii-nitride light emitting device |
| CN104932056A (en) * | 2015-06-25 | 2015-09-23 | 南京邮电大学 | Photonic crystal annular cavity terahertz filter |
| CN207817240U (en) * | 2018-01-24 | 2018-09-04 | 厦门大学嘉庚学院 | Terahertz wave band quadruple photonic crystal band stop filter structure |
-
2019
- 2019-12-12 CN CN201911277904.8A patent/CN111009707A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5389943A (en) * | 1991-02-15 | 1995-02-14 | Lockheed Sanders, Inc. | Filter utilizing a frequency selective non-conductive dielectric structure |
| CN101881918A (en) * | 2010-05-25 | 2010-11-10 | 南京邮电大学 | Terahertz wave modulator based on nonlinear photonic crystal and modulating method |
| CN103180973A (en) * | 2010-11-02 | 2013-06-26 | 皇家飞利浦电子股份有限公司 | Iii-nitride light emitting device |
| WO2013090177A1 (en) * | 2011-12-12 | 2013-06-20 | The Trustees Of Columbia University In The City Of New York | Systems and methods for suspended polymer photonic crystal cavities and waveguides |
| CN104932056A (en) * | 2015-06-25 | 2015-09-23 | 南京邮电大学 | Photonic crystal annular cavity terahertz filter |
| CN207817240U (en) * | 2018-01-24 | 2018-09-04 | 厦门大学嘉庚学院 | Terahertz wave band quadruple photonic crystal band stop filter structure |
Non-Patent Citations (1)
| Title |
|---|
| YOSHIHIRO AKAHANE等: "Investigation of high-Q channel drop filters using donor-type defects in two-dimensional photonic crystal slabs", 《APPLIED PHYSICS LETTERS》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112394440A (en) * | 2020-10-28 | 2021-02-23 | 中通服咨询设计研究院有限公司 | Radio frequency band-pass filter based on two-dimensional photonic crystal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Chu et al. | Novel UWB bandpass filter using stub-loaded multiple-mode resonator | |
| CN101950827A (en) | Branch node loaded ultra wideband microwave filter | |
| CN103367844B (en) | Multi-branch loading-based three passband high-temperature superconductive filter | |
| CN110838610B (en) | One-dimensional filter array dielectric waveguide band-pass filter and design method thereof | |
| Chu et al. | Compact ultra-wideband bandpass filter based on SIW and DGS technology with a notch band | |
| CN101719579A (en) | Multi-band bandstop filter and multi-band bandpass filter | |
| CN108011161A (en) | Microwave filter and its design method based on electro-magnetic bandgap and complementary split-rings resonator structure | |
| CN114497941A (en) | Terahertz waveguide filter based on dual-mode resonant cavity and design method thereof | |
| Liu et al. | A novel UWB filter with notch-band characteristic using radial-UIR/SIR loaded stub resonators | |
| CN107256995B (en) | Microstrip dual-passband band-pass filter | |
| Kim et al. | CPW bandstop filter using slot-type SRRs | |
| CN102751553B (en) | Small four-stop-band filter | |
| CN111009707A (en) | high-Q-value radio frequency band elimination filter based on two-dimensional photonic crystal | |
| CN209690558U (en) | Photon crystal filter with tangent bend L shape microcavity | |
| US7532918B2 (en) | Superconductive filter having U-type microstrip resonators with longer and shorter parallel sides | |
| CN209344285U (en) | A kind of bicyclic ultra wide band bandpass filter of high-temperature superconductor multimode | |
| CN101217210B (en) | A three frequency band filter based on parallel coupled line structure | |
| Ke et al. | Microstrip bandstop filter using open stub and spurline | |
| CN112394440A (en) | Radio frequency band-pass filter based on two-dimensional photonic crystal | |
| Vidhya et al. | Performance Enhancement Of Microstrip Hairpin Band Pass FilterUsing Dumbbell DGS and Split Ring Resonator DGS | |
| CN104733812A (en) | Substrate integrated waveguide high-pass filter | |
| CN103219572A (en) | Microwave band-pass filter | |
| Wei et al. | Design of a compact UWB bandpass filter with defected ground structure | |
| CN109828329A (en) | Photon crystal filter with tangent bend L shape microcavity | |
| Karthikeyan et al. | Performance enhancement of microstrip bandpass filter using CSSRR |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200414 |