CN209709137U - A kind of Terahertz dual-attenuation filter and its communication system based on single layer structure - Google Patents
A kind of Terahertz dual-attenuation filter and its communication system based on single layer structure Download PDFInfo
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- CN209709137U CN209709137U CN201920585572.9U CN201920585572U CN209709137U CN 209709137 U CN209709137 U CN 209709137U CN 201920585572 U CN201920585572 U CN 201920585572U CN 209709137 U CN209709137 U CN 209709137U
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Abstract
The utility model discloses a kind of Terahertz dual-attenuation filter and its communication system based on single layer structure.Filter includes substrate and top layer resonance structure, and top layer resonance structure is fixed in substrate.Top layer resonance structure includes the multiple resonant elements being arranged in array.Each resonant element is square, and opens up four rectangular notches, center spaced set of four rectangular notches around corresponding resonant element.Substrate is made by flexible polyimide material, and resonant element is made by copper.The substrate of the filter of the utility model uses flexible polyimide material and for single layer structure, top layer resonance structure is single structure, it can reduce the complexity of filter design and emulation, the difficulty of production is reduced simultaneously, and then the design and producing cost of filter is reduced, improve the production efficiency of filter.Filter shows good stopband characteristic and frequency selective characteristic, so as to improve the stopband characteristic and frequency selective characteristic of filter.
Description
Technical field
The utility model relates to a kind of dual-attenuation filters in wave filter technology field, more particularly to one kind to be based on single layer knot
The Terahertz dual-attenuation filter of structure, further relates to a kind of multiband wireless telecommunication system.
Background technique
Electromagnetism Meta Materials can generate strong electromagnetic response to THz wave, to realize effective tune to THz wave
Control, is therefore widely used in Terahertz science and technology field, it can be achieved that various novel Terahertz function elements.Terahertz
Filter is one of the critical function component of Terahertz communication and imaging system, in recent years, the Terahertz based on electromagnetism Meta Materials
Rapidly, many concrete implementation structures and methods are proposed filter progress successively, are greatly promoted terahertz filter
Development.
But existing dual-attenuation filter is extended by planar structure or multilayer metamaterial structure stacks and realizes that frequency band expands
The method of exhibition, so that filter design and emulation are complicated, and the difficulty of production is big, and stopband characteristic and frequency selective characteristic
It is not very good.
Utility model content
Problem in view of the prior art, the utility model provide a kind of Terahertz dual-attenuation filter based on single layer structure
And its communication system, it solves existing dual-attenuation filter design and emulation is complicated, the big problem of the difficulty of production.
The utility model is implemented with the following technical solutions: a kind of Terahertz dual-attenuation filter based on single layer structure,
Comprising:
Substrate；
Top layer resonance structure, is fixed in substrate；
Wherein, top layer resonance structure includes the multiple resonant elements being arranged in array；Each resonant element is square, and
Open up four rectangular notches；Center spaced set of four rectangular notches around corresponding resonant element；
Substrate is made by flexible polyimide material, and resonant element is made by copper.
As a further improvement of the foregoing solution, substrate is rectangular configuration, and thickness is greater than the thickness of resonant element.
As a further improvement of the foregoing solution, substrate is square structure, multiple resonant element spaced sets.
Further, the length direction of four rectangular notches is arranged towards the center of resonant element.
Still further, the distance between two opposite rectangular notches are greater than twice of rectangular notch length.
Still further, the distance between two opposite rectangular notches are 400um；In each resonant element, each
The distance between side of resonant element corresponding to rectangular notch and adjacent rectangular notch is 320um；The length of each rectangular notch
Degree is 160um, width 80um.
Still further, substrate with a thickness of 60um, resonant element with a thickness of 18um.
Still further, multiple resonant elements are arranged in the distance between square matrices, two adjacent resonant elements
For 1800um.
As a further improvement of the foregoing solution, substrate is circular configuration；The Terahertz dual-attenuation filter further include:
Round outline border is coaxially disposed with substrate；The edge card of substrate is in the inner wall of round outline border.
The utility model also provides a kind of multiband wireless telecommunication system comprising at least one above-mentioned any described base
In the Terahertz dual-attenuation filter of single layer structure.
The Terahertz dual-attenuation filter and its communication system based on single layer structure of the utility model, has with following
Beneficial effect:
1, the Terahertz dual-attenuation filter based on single layer structure of the utility model, substrate use flexible polyimide
Material and be single layer structure, top layer resonance structure be single structure, can reduce filter design and emulation complexity, simultaneously
The difficulty of production is reduced, and then reduces the design and producing cost of filter, improves the production efficiency of filter.Moreover, the filter
Wave device realizes electric resonance and magnetic resonance simultaneously, and at the resonance frequency corresponding to two resonance peaks, both resonant modes
Formula is completely coincident, and is allowed the filter to extraneous incident electromagnetic wave while being generated electroresponse and magnetic response, with into
Row filtering.
2, when electromagnetic wave vertical incidence to the surface based on substrate and top layer resonance structure, the filter of the utility model
Produce two stopbands that 3-dB bandwidth is 19.3GHz and 9.1GHz respectively at 126.32GHz and 177.32GHz, accordingly
Quality factor are respectively 6.6 and 19.5.At resonance frequency corresponding to stopband, insertion loss can be respectively reached-
47.38dB and -56.69dB, shows good stopband characteristic and frequency selective characteristic, so as to improve the stopband of filter
Characteristic and frequency selective characteristic.
3, the utility model is analyzed by electric field to top layer resonance structure surface and current distribution, and to effective
Electromagnetic parameter carries out Inversion Calculation, has got the electromagnetic response information of filter.In the frequency range corresponding to two stopbands too
When Hertz wave is incident on Meta Materials filter construction surface, most incidence wave energy is by the top layer resonance knot on filter surface
EMR electromagnetic resonance existing for structure consumes, and remaining very small part incidence wave energy can continue to propagate and have passed through substrate, In
It also has part energy during this to be consumed, therefore, the energy for finally penetrating filter and transmiting away is few, in turn
Two very big stopbands of insertion loss are realized, the dual-attenuation characteristic of filter is realized.
Detailed description of the invention
Fig. 1 is the top view of the Terahertz dual-attenuation filter based on single layer structure of the utility model embodiment 1；
Fig. 2 is the top view at a resonant element of top layer resonance structure in the filter in Fig. 1；
Fig. 3 is the side view of the filter in Fig. 1；
Fig. 4 is that the transmission characteristic of the Terahertz dual-attenuation filter based on single layer structure of the utility model embodiment 1 is imitative
True curve graph；
Fig. 5 is the normalized impedance of the Terahertz dual-attenuation filter based on single layer structure of the utility model embodiment 1
Curve graph；
Fig. 6 is the effective refractive index of the Terahertz dual-attenuation filter based on single layer structure of the utility model embodiment 1
Curve graph；
Fig. 7 is that effective dielectric of the Terahertz dual-attenuation filter based on single layer structure of the utility model embodiment 1 is normal
Several curve graphs；
Fig. 8 is the Effective permeability of the Terahertz dual-attenuation filter based on single layer structure of the utility model embodiment 1
Curve graph；
Fig. 9 is the top view of the Terahertz dual-attenuation filter based on single layer structure of the utility model embodiment 1.
Symbol description:
1 substrate, 4 rectangular notch
The round outline border of 2 top layer resonance structure 5
3 resonant elements
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only to explain this
Utility model is not used to limit the utility model.
Embodiment 1
Fig. 1, Fig. 2 and Fig. 3 are please referred to, a kind of Terahertz dual-attenuation filtering based on single layer structure is present embodiments provided
Device comprising substrate 1 and top layer resonance structure 2.
Substrate 1 is made by flexible polyimide material, the relative dielectric constant ε of the flexible polyimide materialrIt is 3.5.
The temperature use scope reachable -200 of polyimides is to 300 degrees Celsius, so that filter is able to use under various temperature environments.
In the present embodiment, substrate 1 can be rectangular configuration, certainly, in some other embodiment, substrate 1 or square
Structure.The length and width of substrate 1 will be respectively greater than the length and width of top layer resonance structure 2, can be according to the actual needs
It is set.Substrate 1 is single layer structure, can reduce filter design, emulation and manufacture difficulty in this way.
Top layer resonance structure 2 is fixed on the base 1, and including multiple resonant elements 3.Multiple resonant elements 3 are in array
Arrangement, and square matrices can be arranged in, and be 5.8 × 10 by conductivity7The copper of S/m is made.Multiple resonance lists
Member 3 can spaced set, i.e. the distance between any two resonant element 3 is constant.Each resonant element 3 is square,
And open up four rectangular notches 4.Center spaced set of four rectangular notches 4 around corresponding resonant element 3, four squares
The length direction of v notch v 4 is arranged towards the center of resonant element 3.In the present embodiment, the thickness of substrate 1 is greater than resonance list
The thickness of member 3, and the distance between two opposite rectangular notches 4 are greater than twice of 4 length of rectangular notch.Due to top layer resonance
Structure 2 is single structure composition, in this way as substrate 1, can reduce the complexity of filter design and emulation, reduces simultaneously
The difficulty of production, and then the design and producing cost of filter is reduced, improve the production efficiency of filter.
In order to the optimum size of each structure of determination, the present embodiment uses the CST based on Time-limited integral
The strip method device of 2015 electromagnetic simulation software of Microwave Studio emulate to the present embodiment filter construction excellent
Change, and obtains each structure size of the filter.Wherein, the distance between two opposite rectangular notches 4 L1 is
400um, the length L3 of each rectangular notch 4 are 160um, and width W1 is 80um.In each resonant element 3, each rectangle is lacked
The distance between mouth 4 and the side of resonant element 3 corresponding to adjacent rectangular notch 4 L2 are 320um.The thickness Hd of substrate 1 is
60um, while the thickness Hm of resonant element 3 is 18um.The distance between two adjacent resonant elements 3 P is 1800um.
The present embodiment has carried out the emulation experiment of transmission characteristic based on above-mentioned values of the structural parameters, to filter.It please refers to
Fig. 4, when electromagnetic wave vertical incidence is to Meta Materials filter construction surface, the filter is in 126.32GHz and 177.32GHz
Place produces two stopbands that 3-dB bandwidth is respectively 19.3GHz and 9.1GHz, and corresponding quality factor q is respectively 6.6 Hes
19.5.In addition, at resonance frequency corresponding to stopband, insertion loss S21Can respectively reach -47.38dB and -
56.69dB, filter show good stopband characteristic and frequency selective characteristic, so as to improve the stopband characteristic of filter
And frequency selective characteristic.
For the filter of the present embodiment compared with traditional filter, function is identical, but two class filters
Filtering mechanism it is entirely different.For the deep transporting mechanism for understanding THz wave in the filter of the present embodiment, in turn
The filtering mechanism of respective filter is disclosed, now using 2015 electromagnetic simulation software of CST Microwave Studio to this implementation
Electric field and Surface current distribution of the filter of example at resonance frequency 126.32GHz and 177.32GHz are emulated.
At 126.32GHz, strong electrical field is mainly distributed on the edge of resonant element 3, in turning for corresponding resonant element 3
Angle Position, field distribution enhancing；And at 177.32GHz, strong electrical field is then symmetrically distributed in the arranged on left and right sides of resonant element 3, together
For sample in the corner of resonant element 3, field distribution is stronger.It is appreciated that forceful electric power field distribution corresponds to strong electric resonance, it is main
Reflect the forceful electric power coupling between adjacent resonant element 3.It is corresponding different humorous for the filter construction of the present embodiment
Shake peak, and the close coupling between adjacent resonant element 3 has appeared in different location.
Surface of the resonant element 3 of the filter of the present embodiment at two resonance peaks 126.32GHz and 177.32GHz
Current distributions.For two resonance peaks, high current presents symmetrical mainly along the arranged on left and right sides of resonant element 3
Annular spread produces corresponding current loop in the arranged on left and right sides of resonant element 3 respectively, forms magnetic dipole, in turn
Produce strong magnetic resonance.And compared with the current distribution at 126.32GHz, the current distribution at 177.32GHz is stronger, because
This corresponding magnetic resonance is also stronger.
By above-mentioned it is found that the filter of the present embodiment realizes electric resonance and magnetic resonance simultaneously, and in two resonance
At resonance frequency corresponding to peak (126.32GHz and 177.32GHz), both modes of resonance (electric resonance and magnetic resonance) have been
What full weight was closed, illustrate that the filter of the present embodiment to extraneous incident electromagnetic wave while can generate electric sound in two resonance peaks
Should and magnetic response.
Fig. 5-8 is please referred to, the present embodiment is based on S parameter inversion algorithm, the filtering being calculated using Matlab software
Normalized impedance z, refractive index n, effective dielectric constant ε, the Effective permeability μ relation curve varying with frequency of device structure.
In the frequency range corresponding to two stopbands, the real part of effective dielectric constant ε, Effective permeability μ and refractive index n
It is negative value, accordingly, there exist real wave vectors, incident electromagnetic wave are propagated in the filter, and two stopband institutes are right
The resonance peak answered is left hand resonance peak.In addition, in the frequency range corresponding to two stopbands, effective dielectric constant ε and effective magnetic
The real part of conductance μ is negative value, also illustrates that the filter construction can generate respectively electric resonance in the two frequency ranges and magnetic is humorous
Vibration realizes electroresponse and magnetic response to incident THz wave respectively, this is with front to Meta Materials filter resonance structure list
The analysis of the electric field and Surface current distribution on first surface fits like a glove.It is appreciated that the effective dielectric constant ε of material and having
The imaginary part for imitating magnetic permeability μ represents loss, and value must be positive.In the frequency range corresponding to two stopbands, effective dielectric constant ε and
The imaginary part of Effective permeability μ can obtain positive maximum, illustrate there is electromagnetic consumable really in the filter, thus shape
At corresponding transmission stopband.But by examining it can be found that having outside the left hand frequency range corresponding to two stopbands
There are minus situations for the imaginary part of effect permittivity ε, this is that physically the not permitted abnormal phenomenon occurred, this exception are existing
As be in left-hand metamaterial it is relatively conventional, mainly since the lattice constant of this sub-wavelength structure unit is there is no much
Work as knot so that extracted material parameter has been related to heterogeneous characteristic of metamaterial structure less than corresponding resonance wavelength
The size of structure unit is gradually reduced, and slowly levels off to the sizes of real atoms, and metamaterial structure is allowed really to be considered as one
When kind homogeneous medium, this abnormal phenomenon will disappear therewith.
Furthermore, it is possible to it is found out that, between two stopbands, the real part of effective dielectric constant ε and Effective permeability μ are still
For negative value, but its corresponding imaginary part but very little even close to zero.Therefore, very small even zero damage of the electromagnetic consumable of material
Consumption, incident THz wave can be directed through filter construction, realize and minimum transmission is lost.
THz wave in short, for the dual-attenuation filter of the present embodiment, in the frequency range corresponding to two stopbands
When being incident on filter construction surface, electricity existing for top layer resonance structure 2 of the most incidence wave energy by filter surface
Magnetic resonance consumes, and remaining very small part incidence wave energy can continue to propagate across the substrate 1 of filter, in this mistake
Also part energy is had in journey to be consumed, and therefore, it is few finally to penetrate the energy that filter transmission is gone out, and then realize slotting
Enter two very big stopbands of loss, here it is the electromagnetic transmission mechanism of the filter of the present embodiment.
The utility model also provides a kind of multiband wireless telecommunication system comprising at least one above-mentioned any described base
In the Terahertz dual-attenuation filter of single layer structure.
In conclusion the Terahertz dual-attenuation filter and its communication system based on single layer structure of the present embodiment, tool
Have it is following the utility model has the advantages that
1, the Terahertz dual-attenuation filter based on single layer structure of the present embodiment, substrate 1 use flexible polyimide
Material and be single layer structure, top layer resonance structure 2 be single structure, can reduce filter design and emulation complexity, together
When reduce production difficulty, and then reduce filter design and producing cost, improve the production efficiency of filter.Moreover, should
Filter realizes electric resonance and magnetic resonance simultaneously, and at the resonance frequency corresponding to two resonance peaks, both resonance
Mode is completely coincident, and is allowed the filter to extraneous incident electromagnetic wave while being generated electroresponse and magnetic response, with
It is filtered.
2, when electromagnetic wave vertical incidence to the surface based on substrate 1 and top layer resonance structure 2, the filter of the present embodiment
Produce two stopbands that 3-dB bandwidth is 19.3GHz and 9.1GHz respectively at 126.32GHz and 177.32GHz, accordingly
Quality factor are respectively 6.6 and 19.5.At resonance frequency corresponding to stopband, insertion loss can be respectively reached-
47.38dB and -56.69dB, shows good stopband characteristic and frequency selective characteristic, so as to improve the stopband of filter
Characteristic and frequency selective characteristic.
3, the present embodiment is analyzed by electric field to 2 surface of top layer resonance structure and current distribution, and to effective
Electromagnetic parameter carries out Inversion Calculation, has got the electromagnetic response information of filter.In the frequency range corresponding to two stopbands too
When Hertz wave is incident on Meta Materials filter construction surface, most incidence wave energy is by the top layer resonance knot on filter surface
EMR electromagnetic resonance existing for structure 2 consumes, and remaining very small part incidence wave energy can continue to propagate and have passed through substrate 1,
Part energy is also had in this process to be consumed, therefore, the energy for finally penetrating filter and transmiting away is few, into
And two very big stopbands of insertion loss are realized, realize the dual-attenuation characteristic of filter.
Embodiment 2
Referring to Fig. 9, present embodiments providing a kind of Terahertz dual-attenuation filter based on single layer structure, implementing
Round outline border 5 is increased on the basis of example 1.Moreover, substrate 1 is circular configuration, and round outline border 5 is coaxially disposed with substrate 1.Base
For the edge card at bottom 1 in the inner wall of round outline border 5, outline border 5 round in this way can protect the internal structure of entire filter.In
In the present embodiment, round outline border 5 can be plastic construction, and can be two-part structure.In this way when substrate 1 to be packed into,
Round outline border 5 first can be divided into two parts, then cover two outside substrate 1, finally fix two parts of round outline border 5.
Embodiment 3
A kind of multiband wireless telecommunication system is present embodiments provided, which includes at least one embodiment 1 or implement
The Terahertz dual-attenuation filter based on single layer structure in example 2.The wireless telecommunication system of the present embodiment can for gsm system,
One of wlan system, UWB system and Bluetooth system, these systems can pass through the filtering in embodiment 1 or embodiment 2
Interference of the device processing from other communications or neighbouring radio frequency system, and filter can be easy to process, is easy to and other plane electricity
Road is integrated, so that wireless telecommunication system applies service performance that is more convenient, and promoting wireless telecommunication system.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (10)
1. a kind of Terahertz dual-attenuation filter based on single layer structure comprising:
Substrate (1)；
Top layer resonance structure (2) is fixed on substrate (1)；
It is characterized in that, top layer resonance structure (2) includes the multiple resonant elements (3) being arranged in array；Each resonant element (3)
It is square, and open up four rectangular notches (4)；Four rectangular notches (4) are between the center of corresponding resonant element (3) etc.
Away from setting；
Substrate (1) is made by flexible polyimide material, and resonant element (3) is made by copper.
2. the Terahertz dual-attenuation filter based on single layer structure as described in claim 1, which is characterized in that substrate (1) is
Rectangular configuration, and thickness is greater than the thickness of resonant element (3).
3. the Terahertz dual-attenuation filter based on single layer structure as described in claim 1, which is characterized in that substrate (1) is
Square structure, multiple resonant element (3) spaced sets.
4. the Terahertz dual-attenuation filter based on single layer structure as described in claim 1, which is characterized in that four rectangles lack
The length direction of mouth (4) is arranged towards the center of resonant element (3).
5. the Terahertz dual-attenuation filter based on single layer structure as claimed in claim 4, which is characterized in that opposite two
The distance between rectangular notch (4) is greater than twice of rectangular notch (4) length.
6. the Terahertz dual-attenuation filter based on single layer structure as claimed in claim 4, which is characterized in that opposite two
The distance between rectangular notch (4) is 400um；In each resonant element (3), each rectangular notch (4) and adjacent rectangle
The distance between side of resonant element (3) corresponding to notch (4) is 320um；The length of each rectangular notch (4) is 160um, wide
Degree is 80um.
7. the Terahertz dual-attenuation filter based on single layer structure as claimed in claim 6, which is characterized in that substrate (1)
With a thickness of 60um, resonant element (3) with a thickness of 18um.
8. the Terahertz dual-attenuation filter based on single layer structure as claimed in claim 7, which is characterized in that multiple resonance lists
First (3) are arranged in square matrices, and the distance between two adjacent resonant elements (3) are 1800um.
9. the Terahertz dual-attenuation filter based on single layer structure as described in claim 1, which is characterized in that substrate (1) is
Circular configuration；The Terahertz dual-attenuation filter further include:
Round outline border (5) is coaxially disposed with substrate (1)；The edge card of substrate (1) is in the inner wall of round outline border (5).
10. a kind of multiband wireless telecommunication system, which is characterized in that it includes at least one as any in claims 1-9
Terahertz dual-attenuation filter described in one based on single layer structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920585572.9U CN209709137U (en) | 2019-04-26 | 2019-04-26 | A kind of Terahertz dual-attenuation filter and its communication system based on single layer structure |
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