CN107482292B - A kind of the Terahertz narrow band filter and its method of narrowband frequency-selecting and frequency tuning - Google Patents
A kind of the Terahertz narrow band filter and its method of narrowband frequency-selecting and frequency tuning Download PDFInfo
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- CN107482292B CN107482292B CN201710585750.3A CN201710585750A CN107482292B CN 107482292 B CN107482292 B CN 107482292B CN 201710585750 A CN201710585750 A CN 201710585750A CN 107482292 B CN107482292 B CN 107482292B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 42
- 238000001914 filtration Methods 0.000 claims abstract description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 239000010980 sapphire Substances 0.000 claims description 5
- 229910052594 sapphire Inorganic materials 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
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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
- H01P1/207—Hollow waveguide filters
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Abstract
The invention discloses the Terahertz narrow band filters and its method of a kind of narrowband frequency-selecting and frequency tuning.The present invention uses filter plate, and electromagnetic wave occurs multiple reflections and transmitted in filter plate, and when the thickness of filter plate is matched with the specific frequency of electromagnetic wave, constructive interference occurs for the electromagnetic wave of transmission, and the electromagnetic wave of transmission is most strong, to realize narrow-band filtering；The air gap between filter tuning cylinder and filter plate, change the resonance frequency of the electromagnetic wave of transmission, the offset and adjustment for realizing filter centre frequency, improve the flexibility and the scope of application of filter, to solve the demand for realizing the narrow-band filtering in several GHz bandwidth in Terahertz frequency range；The configuration of the present invention is simple, preparation process flow is short, advantageously reduces preparation cost and improves performance.
Description
Technical field
The present invention relates to terahertz filters, and in particular to a kind of Terahertz narrow-band filtering of narrowband frequency-selecting and frequency tuning
Device and its method.
Background technique
THz wave typically refers to the electromagnetic wave of 0.1THz-10THz wave band, between microwave and visible light, has weight
Scientific research and the application study value wanted.So far, we to the understanding of THz wave characteristic and research also than relatively limited, THz source
It need further to develop with application device, thus forms " the Terahertz gap " between infrared ray and millimeter wave.Terahertz
It is played an important role in fields such as detection, imaging, communications.Wherein, Terahertz communication have transmission capacity big, good confidentiality,
The advantages such as wave beam is narrow, and filter is essential component part in Terahertz communication system.Although both at home and abroad for terahertz
Hereby the research of filter is gradually unfolded, but terahertz filter is as the key points and difficulties in Terahertz passive device, still
So us is needed constantly to study, especially designing the terahertz filter with narrower bandwidth still has certain choose
War.
Often structure is complicated for the terahertz filter in existing stage, and difficult to realize when centre frequency is Terahertz frequency range
Filter function in several GHz bandwidth.
Summary of the invention
In order to overcome prior art construction complicated, the deficiencies of manufacturing process is difficult and higher cost, especially solve too
The demand of the narrow-band filtering in several GHz bandwidth is realized in hertz frequency range, the invention proposes a kind of narrowband frequency-selecting and frequency tune
Humorous Terahertz narrow band filter and its method.
An object of the present invention is to provide the Terahertz narrow band filters of a kind of narrowband frequency-selecting and frequency tuning.
The Terahertz narrow band filter of narrowband frequency-selecting and frequency tuning of the invention include: the first cylindrical waveguide, filter plate,
Second cylindrical waveguide and filter tuning cylinder；Wherein, the first cylindrical waveguide, filter plate and the second cylindrical waveguide be sequentially connected and
It is coaxial；Filter plate is circular tabular, and the front surface and rear surface of filter plate are parallel to each other, and perpendicular to axis；Filtering
The radius of piece is greater than the outer diameter of the first cylindrical waveguide and the second cylindrical waveguide；The filter tuning cylindrical sleeve of tubular is mounted in filter plate
Outside, and the two is coaxial, and the internal diameter of filter tuning cylinder is greater than the radius of filter plate, shape between filter tuning cylinder and filter plate
At the air gap；Electromagnetic wave vertical incidence is transmitted to filter plate through the first cylindrical waveguide to the first cylindrical waveguide；Electromagnetic wave is being filtered
Reflection and transmission occur for the front surface of wave plate, and multiple reflections occur in filter plate for the electromagnetic wave of transmission, and after filter plate
Reflection and transmission occur for surface, generate multi-beam and interfere to form resonance；The thickness of filter plate and the specific frequency of electromagnetic wave meet
When certain relationship, constructive interference occurs for the electromagnetic wave that rear surface transmits under the frequency, and the electromagnetic wave of frequency transmission is most strong, thus
Realize narrow-band filtering；The air gap between filter tuning cylinder and filter plate changes the resonance frequency of the electromagnetic wave of transmission, draws
Carrier deviation is played, to realize frequency tuning；Electromagnetic wave after narrow-band filtering and frequency tuning is by the second cylindrical waveguide
Output.
Filter plate uses sapphire, has hardness big, and relative dielectric constant with low-loss feature, can obtain high Q greatly
Value, improves the performance of filter.Simultaneously, it is contemplated that the easy availability and cost of material, sapphire are ideal filter plates
Material.
In the front surface of filter plate reflection and transmission occur for electromagnetic wave, and the electromagnetic wave of transmission occurs repeatedly anti-in filter plate
It penetrates, reflection and transmission, the adjacent two beams electromagnetic wave phase differences of rear surface transmission occurs in rear surfaceAre as follows:
Wherein, n is the refractive index of filter plate, and d is the thickness of filter plate, λgThe wavelength for being electromagnetic wave in filter plate.
When constructive interference occurs for the electromagnetic wave of rear surface transmission, phase differenceFor the integral multiple of 2 π, the electromagnetic wave of transmission
Wave is most strong, meets:
Wherein, m is positive integer, and λ is the aerial wavelength of electromagnetic wave, εrFor the relative dielectric constant of filter plate,C is the light velocity, and f is the frequency of electromagnetic wave, when the specific frequency of electromagnetic wave and the thickness of filter plate meet above-mentioned relation, thoroughly
The electromagnetic wave penetrated is most strong.
Filter tuning cylindrical sleeve is mounted in outside filter plate by bracket, forms air between filter tuning cylinder and filter plate
Gap, the air gap are 0.01~0.1mm, have preferable frequency modulation and filter effect.Using filter tuning cylinder to electromagnetic wave
Subtle disruption, so that the resonance frequency of electromagnetic wave is changed, and then cause the offset of filter centre frequency, realize different frequencies
The filtering demands of rate.By increasing the air gap, realizes the downward offset of the centre frequency of filter, improve the spirit of filter
Activity and the scope of application.
Filter tuning cylinder is identical with the thickness of filter plate along axial length；Filter tuning cylinder it is coaxial with filter plate and
The two center is overlapped.The material of filter tuning cylinder using can cut down, the metal material of iron or copper.
First cylindrical waveguide and the second cylindrical waveguide using can cut down, the metal material of iron or copper, realize the biography of THz wave
It is defeated.
It is another object of the present invention to provide the Terahertz narrow band filters of a kind of narrowband frequency-selecting and frequency tuning
Tuning methods.
The tuning methods of the Terahertz narrow band filter of narrowband frequency-selecting and frequency tuning of the invention, comprising the following steps:
1) electromagnetic wave vertical incidence is to the first cylindrical waveguide；
2) filter plate is transmitted to through the first cylindrical waveguide；
3) in the front surface of filter plate reflection and transmission occur for electromagnetic wave, and the electromagnetic wave of transmission occurs repeatedly in filter plate
Reflection, and reflection and transmission occurs in the rear surface of filter plate, it generates multi-beam and interferes to form resonance, the thickness and electricity of filter plate
When the specific frequency of magnetic wave meets certain relationship, constructive interference occurs for the electromagnetic wave that rear surface transmits under the frequency, transmits the frequency
The electromagnetic wave of rate is most strong, to realize narrow-band filtering；
4) the air gap between filter tuning cylinder and filter plate is controlled, the resonance frequency of the electromagnetic wave of transmission is changed,
Cause carrier deviation, to realize frequency tuning；
5) electromagnetic wave after narrow-band filtering and frequency tuning is exported by the second cylindrical waveguide.
Wherein, in step 3), in the front surface of filter plate reflection and transmission occur for electromagnetic wave, and the electromagnetic wave of transmission is being filtered
Multiple reflections occur in wave plate, reflection and transmission, the phase difference of the adjacent two beams electromagnetic wave of rear surface transmission occurs in rear surfaceMeet following relationship:
Wherein, n is the refractive index of filter plate, and d is the thickness of filter plate, λgThe wavelength for being electromagnetic wave in filter plate.
When constructive interference occurs for the electromagnetic wave of transmission, phase differenceElectromagnetic wave wave for the integral multiple of 2 π, transmission is most strong,
Meet:
Wherein, m is positive integer, and λ is the aerial wavelength of electromagnetic wave, εrFor the relative dielectric constant of filter plate.
Advantages of the present invention:
The present invention uses filter plate, and electromagnetic wave occurs multiple reflections and transmitted in filter plate, the thickness and electricity of filter plate
When the specific frequency matching of magnetic wave, constructive interference occurs for the electromagnetic wave of transmission, and the electromagnetic wave of transmission is most strong, to realize that narrowband is filtered
Wave；The air gap between filter tuning cylinder and filter plate changes the resonance frequency of the electromagnetic wave of transmission, realizes in filter
The offset and adjustment of frequency of heart, improve the flexibility and the scope of application of filter, to solve to realize in Terahertz frequency range several
The demand of narrow-band filtering in a GHz bandwidth；The configuration of the present invention is simple, preparation process flow is short, advantageously reduces preparation cost
With raising performance.
Detailed description of the invention
Fig. 1 is the schematic diagram of the Terahertz narrow band filter of narrowband frequency-selecting of the invention and frequency tuning；
Fig. 2 is the schematic diagram of the filter plate of the Terahertz narrow band filter of narrowband frequency-selecting of the invention and frequency tuning；
Fig. 3 is the signal of the filter tuning cylinder of the Terahertz narrow band filter of narrowband frequency-selecting of the invention and frequency tuning
Figure, wherein (a) is main view, (b) is side view；
Fig. 4 is the signal of the first cylindrical waveguide of the Terahertz narrow band filter of narrowband frequency-selecting of the invention and frequency tuning
Figure, wherein (a) is main view, (b) is side view；
Fig. 5 is filter tuning cylinder and the filtering of the Terahertz narrow band filter of narrowband frequency-selecting of the invention and frequency tuning
The reflection spectrogram that the air gap between piece is fixed；
Fig. 6 is filter tuning cylinder and the filtering of the Terahertz narrow band filter of narrowband frequency-selecting of the invention and frequency tuning
In the reflection spectrogram of multiple and different the air gaps between piece.
Specific embodiment
With reference to the accompanying drawing, by specific embodiment, the present invention is further explained.
As shown in Figure 1, the narrowband frequency-selecting of the present embodiment and the Terahertz narrow band filter of frequency tuning include: the first cylinder
Waveguide 3, filter plate 1, the second cylindrical waveguide 4 and filter tuning cylinder 2；Wherein, the first cylindrical waveguide 3, filter plate 1 and the second circle
Column waveguide 4 is sequentially connected and coaxial；Filter plate 1 is circular tabular, and the front surface and rear surface of filter plate are parallel to each other,
And perpendicular to axis；The radius of filter plate is greater than the outer diameter of the first cylindrical waveguide and the second cylindrical waveguide；The filtering tune of tubular
Humorous cylinder 2 is sleeved on outside filter plate, and the two is coaxial, and the internal diameter of filter tuning cylinder is greater than the radius of filter plate, and filtering is adjusted
The air gap 5 is formed between humorous cylinder and filter plate.
As shown in Fig. 2, filter plate is circular tabular.
As shown in figure 3, filter tuning cylinder is tubular, inside radius R1, outer radius R2。
As shown in figure 4, the inside radius of the first cylindrical waveguide is R3, outer radius R4, length L.
In the present embodiment, the first cylindrical waveguide and the use of the second cylindrical waveguide can be cut down；Filter plate uses sapphire；Filtering
The centre frequency of device is 330GHz, corresponding aerial wavelength X=0.91mm；The ruler of first and second cylindrical waveguides 4
It is very little the same, inside radius R3=0.3mm, outer radius R4=0.5mm, length L=5mm；Sapphire relative dielectric constant εr=10,
The radius of filter plate is 0.9mm.Then thickness d meets:
The coarse value of thickness is acquired, while in view of the influence of the air gap outside filter plate circumference, it is imitative using electromagnetism
True software HFSS optimizes emulation, while the control of the feasibility and cost in view of device fabrication realization, filter tuning circle
The effect of cylinder is in filter plate circumferential profile into small the air gap, therefore the inside radius of filter tuning cylinder is than filter plate
Radius is bigger, takes the inside radius R of filter tuning cylinder1=0.91mm, outer radius R2=1mm, thickness d=0.1mm.
From figure 5 it can be seen that the air gap is that 0.1mm has preferable frequency modulation and filter effect, the centre frequency of filter is sent out
Offset has been given birth to, probably in 333GHz, three dB bandwidth 1.7GHz, there is good narrow-band filtering effect.
As seen from Figure 6, it can change the centre frequency of filter by changing the size in filter plate peripheral air gap.?
In certain range, the centre frequency of filter can be mobile to the low direction of frequency with the increase of the air gap, for multifrequency
The filtering of rate point is of great significance.
It is finally noted that the purpose for publicizing and implementing example is to help to further understand the present invention, but this field
Technical staff be understood that without departing from the spirit and scope of the invention and the appended claims, it is various replacement and repair
It is all possible for changing.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention is to weigh
Subject to the range that sharp claim defines.
Claims (9)
1. the Terahertz narrow band filter of a kind of narrowband frequency-selecting and frequency tuning, which is characterized in that the Terahertz narrow-band filtering
Device includes: the first cylindrical waveguide, filter plate, the second cylindrical waveguide and filter tuning cylinder；Wherein, first cylindrical waveguide,
Filter plate and the second cylindrical waveguide are sequentially connected and coaxial；The filter plate is circular tabular, the front surface of filter plate
It is parallel to each other with rear surface, and perpendicular to axis；The radius of filter plate is greater than the first cylindrical waveguide and the second cylindrical waveguide
Outer diameter；The filter tuning cylindrical sleeve of tubular is outside filter plate, and the two is coaxial, and the internal diameter of the filter tuning cylinder is greater than
The radius of filter plate forms the air gap between filter tuning cylinder and filter plate；Electromagnetic wave vertical incidence is to the first cylindrical wave
It leads, is transmitted to filter plate through the first cylindrical waveguide；In the front surface of filter plate reflection and transmission, the electromagnetism of transmission occur for electromagnetic wave
Multiple reflections occur in filter plate for wave, and reflection and transmission occurs in the rear surface of filter plate, generate multi-beam and interfere to be formed
Resonance；When the thickness of filter plate and the specific frequency of electromagnetic wave meet certain relationship, the electromagnetic wave of rear surface transmission under the frequency
Constructive interference occurs, the electromagnetic wave of frequency transmission is most strong, to realize narrow-band filtering；Between filter tuning cylinder and filter plate
The air gap, change the resonance frequency of the electromagnetic wave of transmission, cause carrier deviation, to realize frequency tuning；Through narrow
It is exported with the electromagnetic wave after filtering and frequency tuning by the second cylindrical waveguide.
2. Terahertz narrow band filter as described in claim 1, which is characterized in that the filter plate uses sapphire.
3. Terahertz narrow band filter as described in claim 1, which is characterized in that when phase occurs for the electromagnetic wave of rear surface transmission
When long interference, the adjacent two beams electromagnetic wave phase differences of rear surface transmissionElectromagnetic wave wave for the integral multiple of 2 π, transmission is most strong, full
Foot:
Wherein, n is the refractive index of filter plate, and d is the thickness of filter plate, λgThe wavelength for being electromagnetic wave in filter plate, m is positive whole
Number, λ are the aerial wavelength of electromagnetic wave, εrFor the relative dielectric constant of filter plate.
4. Terahertz narrow band filter as described in claim 1, which is characterized in that the filter tuning cylinder and filter plate it
Between the air gap be 0.01~0.1mm.
5. Terahertz narrow band filter as described in claim 1, which is characterized in that the length and filter of the filter tuning cylinder
The thickness of wave plate is identical；Filter tuning cylinder is coaxial with filter plate and the two center is overlapped.
6. Terahertz narrow band filter as described in claim 1, which is characterized in that the material of the filter tuning cylinder uses
It can cut down, iron or copper.
7. Terahertz narrow band filter as described in claim 1, which is characterized in that first cylindrical waveguide and the second cylinder
Waveguide using can cut down, iron or copper.
8. a kind of tuning methods of the Terahertz narrow band filter of narrowband frequency-selecting and frequency tuning, which is characterized in that the tuning
Method the following steps are included:
1) electromagnetic wave vertical incidence is to the first cylindrical waveguide；
2) filter plate is transmitted to through the first cylindrical waveguide；
3) in the front surface of filter plate reflection and transmission occur for electromagnetic wave, and the electromagnetic wave of transmission occurs repeatedly anti-in filter plate
It penetrates, and reflection and transmission occurs in the rear surface of filter plate, generate multi-beam and interfere to form resonance, the thickness and electromagnetism of filter plate
When the specific frequency of wave meets certain relationship, constructive interference occurs for the electromagnetic wave that rear surface transmits under the frequency, transmits the frequency
Electromagnetic wave it is most strong, to realize narrow-band filtering；
4) the air gap between filter tuning cylinder and filter plate is controlled, changes the resonance frequency of the electromagnetic wave of transmission, causes
Carrier deviation, to realize frequency tuning；
5) electromagnetic wave after narrow-band filtering and frequency tuning is exported by the second cylindrical waveguide.
9. tuning methods as claimed in claim 8, which is characterized in that in step 3), when the electromagnetic wave generation of transmission is mutually grown
When interference, the adjacent two beams electromagnetic wave phase differences of rear surface transmissionElectromagnetic wave for the integral multiple of 2 π, transmission is most strong, meets:
Wherein, n is the refractive index of filter plate, and d is the thickness of filter plate, λgThe wavelength for being electromagnetic wave in filter plate, m is positive whole
Number, λ are the aerial wavelength of electromagnetic wave, εrFor the relative dielectric constant of filter plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710585750.3A CN107482292B (en) | 2017-07-18 | 2017-07-18 | A kind of the Terahertz narrow band filter and its method of narrowband frequency-selecting and frequency tuning |
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| CN201710585750.3A CN107482292B (en) | 2017-07-18 | 2017-07-18 | A kind of the Terahertz narrow band filter and its method of narrowband frequency-selecting and frequency tuning |
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| CN107482292A CN107482292A (en) | 2017-12-15 |
| CN107482292B true CN107482292B (en) | 2019-06-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109946784A (en) * | 2017-12-20 | 2019-06-28 | 北京大学 | A kind of multi-pass band three layers of vacuum window of Terahertz and its implementation |
| CN109167130A (en) * | 2018-08-02 | 2019-01-08 | 电子科技大学 | A kind of SIW method wave interference filter |
| CN110011068B (en) * | 2019-04-26 | 2021-04-02 | 内蒙古大学 | Terahertz metamaterial wave absorber with actively tunable frequency and manufacturing method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1737674A (en) * | 2005-08-10 | 2006-02-22 | 华中科技大学 | Clamp-on filtering semiconductor light amplifier |
| CN104934668A (en) * | 2015-06-29 | 2015-09-23 | 北京大学 | High-Q value terahertz opening cavity having mode selection function and mode selection method thereof |
| CN204882929U (en) * | 2015-06-23 | 2015-12-16 | 哈尔滨工程大学 | Tunable mode converter of terahertz wave |
| CN106099263A (en) * | 2016-05-25 | 2016-11-09 | 哈尔滨工程大学 | A kind of THz wave wave filter interacted based on forbidden band |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120071233A (en) * | 2010-12-22 | 2012-07-02 | 한국전자통신연구원 | Tunable resonator filter |
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- 2017-07-18 CN CN201710585750.3A patent/CN107482292B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1737674A (en) * | 2005-08-10 | 2006-02-22 | 华中科技大学 | Clamp-on filtering semiconductor light amplifier |
| CN204882929U (en) * | 2015-06-23 | 2015-12-16 | 哈尔滨工程大学 | Tunable mode converter of terahertz wave |
| CN104934668A (en) * | 2015-06-29 | 2015-09-23 | 北京大学 | High-Q value terahertz opening cavity having mode selection function and mode selection method thereof |
| CN106099263A (en) * | 2016-05-25 | 2016-11-09 | 哈尔滨工程大学 | A kind of THz wave wave filter interacted based on forbidden band |
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