CN112394440A - Radio frequency band-pass filter based on two-dimensional photonic crystal - Google Patents
Radio frequency band-pass filter based on two-dimensional photonic crystal Download PDFInfo
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- 239000004038 photonic crystal Substances 0.000 title claims abstract description 39
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- 229910052710 silicon Inorganic materials 0.000 claims description 2
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- G—PHYSICS
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- G02B5/00—Optical elements other than lenses
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- G02B5/28—Interference filters
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- G02B5/288—Interference filters comprising deposited thin solid films comprising at least one thin film resonant cavity, e.g. in bandpass filters
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Abstract
The invention provides a radio frequency band-pass filter based on a two-dimensional photonic crystal, 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-pass filter, and the other end of the linear waveguide is plugged by adding a first-type circular dielectric column; the filter body is provided with a resonant cavity and a plurality of rows of first-class circular dielectric columns, wherein the resonant cavity is arranged in one row, and the first-class circular dielectric columns in the resonant cavity are replaced by a plurality of continuously arranged second-class circular dielectric columns meeting a lattice mismatch constant; a linear waveguide is vertically arranged above the resonant cavity, wherein an upper port is an output port; a third round medium column is arranged between the resonant cavity and the output port; 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 belongs to the technical field of microwave photonic crystal filters, and particularly relates to a radio frequency band-pass filter based on a two-dimensional photonic crystal.
Background
In recent years, with the advent of the 5G era, communication technologies have been rapidly developed, and among them, the development of wireless communication technologies has attracted people and has great application potential in the fields of life, military and the like. In order to solve the problem that the ultra-fast transmission speed of data is kept in a short distance, the ultra-wideband communication technology is developed as a new communication technology, the ultra-wideband communication technology is greatly convenient for the life of people, and the development of the technology has important significance for solving the problem of high-speed wireless transmission in the short distance of the data. In the development process of the ultra-wideband communication technology, the radio frequency filter plays an extremely important role, and due to the increasing shortage of radio frequency spectrum resources, the radio frequency filter plays a role in separating electromagnetic wave signals and screening specific signals so as to reasonably distribute signal resources. The research on the integrated and high-performance radio frequency filter is crucial to the development of ultra-wideband communication, and the research on the high-performance filter and the design and implementation of the filter for different application occasions have been a research hotspot.
For a conventional rf filter, parasitic stop band problems arise due to the integer multiple local oscillator frequency resonance characteristics of the distributed components. The existence of the parasitic stop band limits the pass band bandwidth of the filter, and if the filter with the parasitic response is applied to restrain strong interference signals, the working signals can not be transmitted normally; if the harmonic wave extraction device is applied to an electromagnetic compatibility harmonic wave test, the harmonic wave which needs to be extracted originally is attenuated to a great extent, and the work of extracting the harmonic wave cannot be finished.
In the face of these problems, new radio frequency filters have been designed using photonic crystals, which are defined as a special artificial periodic dielectric structure whose dimensions are in the same order of magnitude as the wavelength of light. Photonic crystals have properties such as photon forbidden bands and photon localization, and are also called "optical semiconductors". The photonic crystal is also called as a photonic band gap material because the photonic crystal generates energy bands under the influence of a periodic potential field when an optical signal propagates in the photonic crystal, and gaps among the energy bands are called as photonic band gaps. The photonic crystal has the characteristics of low transmission loss, small size and the like, and meets the requirements of communication development on small size and easy integration of devices when preparing communication devices.
By combining the radio frequency technology and the photonic crystal technology, a radio frequency filter with better performance can be designed. The radio frequency photonic crystal filter based on the two-dimensional photonic crystal still has the following problems:
1. as can be seen from the working frequency band of the photonic crystal filter, most of the working frequency of the filter is deviated to the optical band, and the research on the radio frequency two-dimensional photonic crystal filter in the radio frequency spectrum range is less;
2. from the filter performance of the filter, the radio frequency filter based on the two-dimensional photonic crystal generally has the defects of narrow bandwidth, low quality factor and the like, and is not beneficial to the application of the radio frequency filter in a radio frequency band;
3. as can be seen from the structure of the photonic crystal filter, most of the filters have larger integral device size, have higher requirements on processing precision, and need to be improved in practical application value. Therefore, the invention provides a radio frequency filter based on the photonic crystal aiming at the problems, and compared with other filters, the device has the advantages of small size, easy integration, simple structure and huge application potential in the wireless communication technology.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the technical problems in the background technology, the invention provides a radio frequency band-pass filter based on two-dimensional photonic crystals, which comprises a filter body, wherein the filter body adopts a dielectric column type structure, the filter body is arranged in a tetragonal lattice mode, a substrate is air, and a first type of round dielectric column (1) of 20 x 13 tetragonal lattice is arranged in the air.
The filter is characterized in that a linear waveguide (2) which is horizontally arranged and penetrates through the center of the filter body is arranged on the filter body, a row of first-type circular dielectric columns are removed from the center of the photonic crystal of the two-dimensional square lattice along the direction of a transverse axis to form a straight waveguide as a transmission waveguide, one end of the transmission waveguide is an input port (3) of the band-pass filter, and 5 linear waveguides are added at a right port of the linear waveguideA first kind of circular dielectric columns forming a reflective cavity (4), wherein the distance between the first kind of circular dielectric columns is a first lattice constant a1。
13 rows of first-class circular dielectric columns are arranged on the filter body, a resonant cavity (5) is arranged in the 7 th row from top to bottom, a row of first-class circular dielectric columns are removed along the direction of a transverse shaft, 22 second-class circular dielectric columns (6) are introduced to form an AAH resonant cavity, wherein two second-class circular dielectric columns at the centers of the 22 second-class circular dielectric columns respectively deviate 0.4a towards two sides relative to the central position of the resonant cavity1；
The distance between the second type of circular dielectric columns is a second lattice constant a2The radius of the second kind of circular dielectric column is r', wherein the lattice mismatch constant beta satisfies the condition that beta is N/(N +1) is a2/a1Wherein N is the number of the second type of circular dielectric columns.
At the moment, the photonic crystal is composed of two structures with different lattice constants, and when light enters the photonic crystal, a photon local phenomenon is caused due to the mutual influence of two different periodic potential energies.
A linear waveguide (7) is vertically arranged above the resonant cavity (5), 6 first-class circular dielectric columns are removed from the upper portion of the resonant cavity (5) along the vertical direction to form an output waveguide, and a port above the output waveguide is an output port (8).
A third round medium column (9) is arranged between the resonant cavity (5) and the output port (8), and the third round medium column is used as a scattering medium column. An optical signal is input from the left input port (3), and when the frequency of incident waves is different from that of the resonant cavity (5), the optical signal is continuously transmitted forwards and is reflected back when passing through the reflecting cavity; when the frequency of the incident wave is equal to that of the resonant cavity, energy is coupled into the resonant cavity, passes through the scattering medium column and is output from the upper side output port, namely the energy has band-pass characteristics, so that the purpose of enabling a specific broadband signal to pass through without attenuation is achieved.
The tetragonal lattice structure adopts a photonic crystal structure, and the first lattice constant is 600 um.
The P first-type circular dielectric columns are arranged on the filter body in a rectangular mode.
The first round dielectric column, the second round dielectric column and the third round dielectric column are made of silicon, have the same refractive index and are 3.41425-3.4145.
The radius of the first round medium column is 108 um;
the radius of the second round medium column is 79.7-80.3 um;
the radius of the third round medium column is 65-90 um.
The second lattice constant is 480 um.
The background medium of the filter body is air.
The invention achieves the following beneficial effects:
the band-pass 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 number N of the first round dielectric columns in the AAH cavity and the radius r' of the third round dielectric column between the resonant cavity and the output port are changed to increase the coupling coefficient, so that the transmittance of the device is 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
The foregoing and/or other advantages of the invention will become further apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
FIG. 1 is a two-dimensional photonic crystal-based RF band-pass filter according to the present invention;
FIG. 2 is a graph showing a stable intensity distribution when the input wavelength satisfies the resonant frequency according to the present invention;
FIG. 3 is a schematic diagram of a side-coupled single resonator filter;
fig. 4 is a filter transmission spectrum of different r' when the number of the medium columns in the AAH cavity is N-4;
fig. 5 is a filter transmission spectrum of different r' when the number of the medium columns in the AAH cavity is N-6;
fig. 6 is a transmission spectrum diagram of a filter with different r' when the number of the medium columns in the AAH cavity is N equal to 8.
Detailed Description
As shown in fig. 1, 2 and 3, the present invention provides a two-dimensional photonic crystal-based rf bandpass filter, including: 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 resonant cavity 5 is provided with a second type of circular dielectric columns 6 which meet the continuous arrangement of lattice mismatch constants, the radius is 108um, and the first lattice constant between the first type of circular dielectric columns is 600 um.
A linear waveguide 7 vertically arranged is arranged above the resonant cavity, 5 medium columns are removed from the upper part of the resonant cavity along the vertical direction to form an output waveguide, wherein an upper port is an output port 8;
a third round dielectric column 9 is arranged between the resonant cavity and the output port, the radius of the third round dielectric column is 65um, the first round dielectric column, the second round dielectric column and the third round 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 3, when only the resonance frequency is consistent with the resonance frequency and falls on the resonance frequency of the resonant cavity, most of electromagnetic waves input into the linear waveguide are coupled to the resonant cavity and output from the output port 8 of the output linear waveguide through the scattering medium column; when the frequency of electromagnetic waves input into the linear waveguide is different from the resonant frequency of the circular ring-shaped resonant cavity, the electromagnetic waves input into the linear waveguide pass through the resonant cavity, energy is totally reflected back, when the number N of the dielectric columns in the AAH cavity is 4 and the radius r is 65um, the resonant wavelength of the resonant cavity is 1677.18um, and the energy passes through the port 8. The rest wavelengths are not matched with the resonant cavity frequency and are totally reflected back; thereby realizing the band-pass characteristic to achieve the purpose of letting the frequency of the appointed broadband signal pass.
Based on the structure model established by simulation software, the filtering process is simulated and calculated, the transmission spectrogram of the filter can be obtained by changing the number and the radius of the dielectric columns of the AAH cavity as shown in figures 5 and 6, as shown in figure 5, the number N of the dielectric columns of the resonant cavity is 4, other parameters are kept unchanged, only the radius r 'of the dielectric columns between the AAH cavity and the emergent waveguide is changed, the size of the r' is changed, and 5um is used as a step interval. It can be seen from the figure that the larger the radius r "of the dielectric cylinder between the AAH cavity and the exit waveguide, the larger the transmittance of the device with the larger radius r" of the dielectric cylinder between the AAH cavity and the exit waveguide, and at r "65 um, the central wavelength is 1665.96um, and the transmittance reaches a maximum of 0.99.
When the number N of the dielectric columns of the AAH resonant cavity is 4 and the radius r is 65um, the resonant wavelength of the transmission peak is 1665.96um, the transmittance is 0.99, and the effect is the best. As shown in fig. 6, the larger the radius r ″ of the dielectric cylinder between the AAH cavity and the exit waveguide, the smaller the transmittance of the device, the larger the radius r ″ of the dielectric cylinder between the AAH cavity and the exit waveguide, and when r ″ is 120um, the center wavelength is 1718.75um, the transmittance is at most 0.45, and the effect is greatly reduced compared to when N is 4. When the radius r ' of the dielectric column between the AAH cavity and the exit waveguide is larger, the transmissivity of the device is increased along with the larger radius r ' of the dielectric column between the AAH cavity and the exit waveguide, and when the r ' is 65um, the central wavelength is 1665.96 μm, and the transmissivity reaches the maximum of 0.97.
The band-pass 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 number and the radius of the dielectric columns of the AAH cavity, so that the transmittance 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 present invention provides a radio frequency band-pass filter based on two-dimensional photonic crystal, and a plurality of methods and approaches for implementing the technical scheme, and the above description is only a preferred embodiment of the present invention, it should be noted that, for those skilled in the art, a plurality of modifications and embellishments can be made without departing from the principle of the present invention, and these modifications and embellishments should also be regarded as the protection scope of the present invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (10)
1. The radio frequency band-pass filter based on the two-dimensional photonic crystal is characterized by comprising a filter body, wherein the filter body adopts a dielectric column type structure, the filter body is arranged in a square lattice mode, a substrate is air, and a first type of round dielectric column (1) of a 20 x 13 square lattice is arranged in the air.
2. The two-dimensional photonic crystal-based radio frequency band-pass filter according to claim 1, wherein the filter body is provided with a linear waveguide (2) horizontally arranged and penetrating through the center of the filter body, a row of first circular dielectric pillars is removed from the center of the two-dimensional square lattice photonic crystal along the direction of a transverse axis to form a straight waveguide as a transmission waveguide, one end of the transmission waveguide is an input port (3) of the band-pass filter, 5 first circular dielectric pillars are added to a right port of the linear waveguide to form a reflection cavity (4), and the distance between the first circular dielectric pillars is a first lattice constant a1。
3. The two-dimensional photonic crystal-based radio frequency band-pass filter according to claim 2, wherein 13 rows of the first circular dielectric pillars are arranged on the filter body, the resonant cavity (5) is arranged in the 7 th row from top to bottom, one row of the first circular dielectric pillars is removed along the direction of the transverse axis, 22 second circular dielectric pillars (6) are introduced to form an AAH resonant cavity, wherein two second circular dielectric pillars at the center of the 22 second circular dielectric pillars are respectively shifted by 0.4a to two sides relative to the central position of the resonant cavity1；
The distance between the second type of circular dielectric columns is a second lattice constant a2Class IIThe radius of the circular dielectric column is r', wherein the lattice mismatch constant beta satisfies the condition that beta is N/(N +1) is a2/a1Wherein N is the number of the second type of circular dielectric columns.
4. The radio frequency band-pass filter based on the two-dimensional photonic crystal is characterized in that a linear waveguide (7) is vertically arranged above the resonant cavity (5), 6 first-type circular dielectric pillars are removed along the vertical direction above the resonant cavity (5) to form an output waveguide, and a port above the output waveguide is an output port (8).
5. The radio frequency band-pass filter based on the two-dimensional photonic crystal according to claim 4, wherein a third circular dielectric column (9) is arranged between the resonant cavity (5) and the output port (8), and the third circular dielectric column is used as a scattering dielectric column.
6. The two-dimensional photonic crystal based radio frequency band-pass filter according to claim 5, wherein the tetragonal lattice structure is a photonic crystal structure, and the first lattice constant is 600 um.
7. The two-dimensional photonic crystal based radio frequency band-pass filter according to claim 6, wherein the first circular dielectric pillars are arranged on the filter body in a rectangular shape.
8. The two-dimensional photonic crystal based radio frequency band-pass filter according to claim 7, wherein the first circular dielectric cylinder, the second circular dielectric cylinder and the third circular dielectric cylinder are made of silicon and have the same refractive index of 3.41425-3.4145.
9. The two-dimensional photonic crystal based radio frequency band-pass filter according to claim 8, wherein the radius of the first circular dielectric cylinder is 108 um;
the radius of the second round medium column is 79.7-80.3 um;
the radius of the third round medium column is 65-90 um.
The second lattice constant is 480 um.
10. The two-dimensional photonic crystal based radio frequency band-pass filter according to claim 9, wherein the background medium of the filter body is air.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114325935A (en) * | 2021-12-08 | 2022-04-12 | 南京邮电大学 | Non-reciprocal double-channel narrow-band filter of non-magnetic photonic crystal |
| CN116136614A (en) * | 2021-11-16 | 2023-05-19 | 中国科学院上海微系统与信息技术研究所 | Narrow band-pass filter above the second order based on two-dimensional closed photonic crystal structure |
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2020
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| CN102722000A (en) * | 2012-07-16 | 2012-10-10 | 北京邮电大学 | Method for implementing microwave photonic filter based on photonic crystal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116136614A (en) * | 2021-11-16 | 2023-05-19 | 中国科学院上海微系统与信息技术研究所 | Narrow band-pass filter above the second order based on two-dimensional closed photonic crystal structure |
| CN114325935A (en) * | 2021-12-08 | 2022-04-12 | 南京邮电大学 | Non-reciprocal double-channel narrow-band filter of non-magnetic photonic crystal |
| CN114325935B (en) * | 2021-12-08 | 2024-04-16 | 南京邮电大学 | Non-magnetic photon crystal non-reciprocal double-channel narrow-band filter |
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Application publication date: 20210223 |