CN107768841A - Terahertz antenna system - Google Patents
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- CN107768841A CN107768841A CN201710847521.4A CN201710847521A CN107768841A CN 107768841 A CN107768841 A CN 107768841A CN 201710847521 A CN201710847521 A CN 201710847521A CN 107768841 A CN107768841 A CN 107768841A
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Abstract
The invention discloses a kind of Terahertz antenna system, including：Main reflector, subreflector, the first feed, lens, the second feed；First feed is used to produce wideband Terahertz frequency comb；The lens, which are used to comb wideband Terahertz caused by the first feed into line convergence, to be collimated；Second feed is used to produce frequency modulation continuous signal, and the frequency modulation continuous signal is launched.The subreflector is used for wideband Terahertz frequency comb after assembling collimation and reflexes to primary reflection surface；The high frequency THz wave of the wideband Terahertz frequency comb is carried out secondary reflection again by the main reflector.Above-mentioned Terahertz antenna system, using double-fed source structure, single output frequency is expanded to the output frequency range with certain bandwidth, broadband signal is changed into the bigger frequency modulation continuous signal of bandwidth, and the signal is launched so that this double-fed source structure can realize bigger transmitting and reception bandwidth.
Description
Technical field
The present invention relates to Terahertz field, more particularly to a kind of Terahertz antenna system.
Background technology
Terahertz antenna system has as Terahertz radar system critical component, its performance quality to whole radar system
Material impact.
Traditional Terahertz antenna system configuration is simple, flexible design, has the spies such as high-gain, low sidelobe, high-resolution
Property, it is highly suitable for high resolution radar and intelligent detecting system.But because transmitting and reception bandwidth are smaller so that traditional terahertz
Hereby antenna system is difficult to launch the signal of big bandwidth.
The content of the invention
Based on this, it is necessary to which the technology that bigger transmitting and reception bandwidth are difficult to for existing Terahertz aerial system is asked
A kind of topic, there is provided Terahertz antenna system.
A kind of Terahertz antenna system, including：Main reflector, subreflector, the first feed, the second feed, the master are anti-
Emitter and subreflector are arranged at intervals, and first feed is arranged between main reflector and subreflector, second feed
It is arranged at side of the subreflector away from main reflector；
First feed is used to produce wideband Terahertz frequency comb, and reflexes to subreflector；
Second feed is used to produce frequency modulation continuous signal, and the frequency modulation continuous signal is launched to subreflector；
The subreflector is used for wideband Terahertz frequency comb after assembling collimation and reflexes to main reflector, and by the tune
Frequency continuous signal is transmitted to main reflector；
The main reflector enters the high frequency THz wave of the wideband Terahertz frequency comb or the frequency modulation continuous signal
Capable secondary reflection again.
In one of the embodiments, first feed includes Terahertz cascaded laser, radio frequency injection module and outer
Chamber resonance modules, the Terahertz cascaded laser are connected with the radio frequency injection module, the radio frequency injection module with it is described
Exocoel resonance modules are connected；
The Terahertz cascaded laser is used to send THz wave；
The radio frequency injection module is used for the frequency spectrum for widening the THz wave；
The frequency spectrum that the exocoel resonance modules are used for the THz wave to widening samples, and forms the wideband Terahertz
Comb.
In one of the embodiments, second feed includes LFM Source, solid-state frequency multiplier chain and Circular polarization horn,
The LFM Source is connected with the solid-state frequency multiplier chain, and the solid-state frequency multiplier chain is connected with Circular polarization horn；
The LFM Source is used to generate broadband signal；
The solid-state frequency multiplier chain is used to the broadband signal forming the frequency modulation continuous signal after the processing of frequency multiplication；
The Circular polarization horn is used for the transmitting frequency modulation continuous signal.
In one of the embodiments, the main reflector is paraboloid structure, and the main reflector is paraboloid structure,
The subreflector is hyperboloid structure, and the main reflector is coaxially disposed with the subreflector and bending direction is identical, institute
Main reflector is stated to overlap with the real focus of subreflector.
In one of the embodiments, the Terahertz antenna system also includes feed switching mechanism and lens, the feedback
Source switching mechanism is used to realize the switching between feed；The lens are disposed adjacent with first feed, and the lens are used for will
Wideband Terahertz comb is collimated caused by first feed.
In one of the embodiments, second feed is arranged at real Jiao that the main reflector overlaps with subreflector
At point；First feed is arranged at the bi-curved virtual focus of subreflector.
In one of the embodiments, the subreflector includes the metamaterial structure unit of periodic arrangement
In one of the embodiments, the metamaterial structure unit includes the first metal layer, coated by dielectric layer, the second gold medal
Belong to layer and high frequency substrate layer, the first metal layer and the second metal layer are non-conterminous, and the coated by dielectric layer is located at first
Between metal level and second metal layer, the high frequency substrate layer is located remotely from one end of first substrate layer.
In one of the embodiments, the metamaterial structure unit is generally square, and the first metal layer is ten
Font, the area of the first metal layer are less than the area of the second metal layer.
In one of the embodiments, the gap of the metamaterial structure unit forms series capacitance, the material structure
Unit belt structure forms series inductance, and periodicity metamaterial structure unit forms equivalent series LC oscillating circuits；It is described super
The real part of permittivity of material structure unit is just, magnetic conductivity real part is negative.
Above-mentioned Terahertz antenna system, using double-fed source structure, first feed can be to the laser frequency spectrum that is received
It is extended, single output frequency is expanded to the output frequency range with certain bandwidth.Second feed can believe broadband
Number it is changed into the bigger frequency modulation continuous signal of bandwidth, and the signal is launched so that this double-fed source structure can be realized bigger
Transmitting and reception bandwidth.
Brief description of the drawings
Fig. 1 is the Terahertz antenna system configuration figure；
Fig. 2 is the first feed and lens arrangement enlarged drawing；
Fig. 3 is the second feed structure enlarged drawing；
Fig. 4 is a kind of top view of form of metamaterial structure unit；
Fig. 5 is the left view of the metamaterial structure unit under this kind of form；
Fig. 6 is the top view of another form of metamaterial structure unit；
Fig. 7 is the left view of metamaterial structure unit under the form；
Fig. 8 is the metamaterial structure unit of periodic arrangement；
Fig. 9 is the first feed antenna pattern added before lens；
Engineering models of the Figure 10 for the first feed after addition lens in software HFSS；
Figure 11 is that the first feed adds antenna pattern after lens；
Figure 12 is the COMSOL of the second feed engineering model and antenna pattern；
Figure 13 is the surface electric field distribution and equipotential lines of the second Feed Horn；
Wherein：
Terahertz antenna system 10
Main reflector 110
Subreflector 120
First feed 130
Terahertz quantum cascaded laser 132
Radio frequency injection module 134
Exocoel resonance modules 136
Lens 140
Second feed 150
LFM Source 152
Solid-state frequency multiplier chain 154
Circular polarization horn 156
Metamaterial structure unit 20
The first metal layer 202
Coated by dielectric layer 204
Second metal layer 206
High frequency substrate 208
Embodiment
For the ease of understanding the present invention, Terahertz antenna system is carried out below with reference to relevant drawings and specific embodiment
Further description.It is understood, however, that specific embodiment described herein is only explaining the present invention, however it is not limited to this
The described embodiment of invention.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The implication that technical staff is generally understood that is identical.Term used in book described herein is intended merely to describe specific embodiment
Purpose, it is not intended that in limitation the present invention.Term as used herein " and/or " include one or more related listd
The arbitrary and all combination of purpose.
Referring to Fig. 1, one embodiment of the present of invention, there is provided a kind of Terahertz antenna system 10 includes：Main reflector
110th, subreflector 120, the first feed 130, the second feed 150；The main reflector 110 and subreflector 120 are arranged at intervals,
First feed 130 is arranged between main reflector 110 and subreflector 120, and second feed 150 is arranged at the pair
Side of the reflector 120 away from main reflector 110.First feed 130 is used to produce wideband Terahertz frequency comb, and reflects
Onto subreflector 120；Second feed 150 is used to produce frequency modulation continuous signal, and the frequency modulation continuous signal is launched
To subreflector 120；The subreflector 120 is used for wideband Terahertz frequency comb after assembling collimation and reflexes to main reflector
110, and the frequency modulation continuous signal is transmitted to main reflector 110；
Further, in double-reflecting plane antenna system, including the main reflector 110 of a paraboloid structure and one pair
The subreflector 120 of curved-surface structure.
In one of the embodiments, the main reflector 110 is paraboloid structure, focus F1 ', the subreflector
120 be hyperboloid structure, and focus has two, is real focus F1 and virtual focus F2 respectively, and the main reflector 110 and the pair are anti-
Emitter 120 is coaxially disposed and bending direction is identical, the focus F1 ' of the main reflector 110 and real focus F1 of subreflector 120
Overlap.
Further, second feed 150 is arranged on real Jiao that the main reflector 110 overlaps with subreflector 120
At point F1；First feed 130 is arranged at the bi-curved virtual focus F2 of the subreflector 120.The first feed hair
The wideband THz wave gone out is after the reflection of the hyperboloid structure of subreflector 120, it can be understood as is from the parabolic of main reflector 110
The focus F1 ' of face structure, namely another wideband THz wave for sending of real focus F1 of the hyperboloid structure of subreflector 120,
Then on the parabola for projecting main reflector 110 again.
Further, the Terahertz antenna system 10 can realize bigger transmitting and reception bandwidth.
Specifically, the Terahertz antenna system 10 additionally uses double-fed source structure, including the first feed 130 and the second feedback
Source 150, first feed 130 can produce wideband Terahertz frequency comb, the frequency band range of the wideband in 2.5THz~5THz,
Available for Object Classification；Second feed 150 is centre frequency 670GHz, bandwidth 50GHz CW with frequency modulation, for into
Picture.It should be noted that the application, which mentions high frequency, refers to that frequency band range is in 2.5THz~5THz caused by first feed
THz wave, relative, low frequency is that the centre frequency that second feed is formed is 670GHz, bandwidth 50GHz Terahertz
Ripple.
In one of the embodiments, referring to Fig. 2, first feed 130 include Terahertz cascaded laser 132,
Radio frequency injection module 134 and exocoel resonance modules 136, the Terahertz cascaded laser 132 and the radio frequency injection module 134
Series connection, the radio frequency injection module 134 are connected with the exocoel resonance modules 136；The Terahertz cascaded laser 132 is used for
Send THz wave；The radio frequency injection module 134 is used for the frequency spectrum for widening the THz wave；The exocoel resonance modules
136 frequency spectrums for being used for the THz wave to widening sample, and form wideband Terahertz comb.It is appreciated that the first feed 130 with
Terahertz cascaded laser 132 is core devices so that the THz wave that Terahertz cascaded laser 132 is sent injects in radio frequency
Module 134 injects radiofrequency signal, and single output frequency is expanded into the frequency range with certain bandwidth exports, subsequently into exocoel
Tuner module 136, the laser spectrum of broadening is sampled using exocoel technology, concrete mode is the output of stable more longitudinal modes
State forms continuous spectrum, carries out modeling output by grating, external cavity mode is formed between grating and device, can be with by adjusting exocoel
The terahertz signal of different frequency is exported, so as to realize the purpose to tera-hertz spectra collection.Terahertz signal and then pass through light
Learn element to assemble and be transmitted into free space, this optical element can be that any one has the optics of converging action.
The above method is non-coherent detection technology, it is not necessary to which special detection light samples to time sequential pulse, and system aspects are certainly
Signal synchronization mechanism so is eliminated, system design complexity can be effectively reduced；In addition, in the above method in a kind of embodiment
The middle frequency domain spectrum information that measured target is directly obtained by the way of frequency sweep, frequency domain spectra in different Terahertz frequencies by being detected
To terahertz signal intensity formed, detection method is simply direct.Height output work(based on Terahertz cascaded laser 132
Rate, remote terahertz light spectrometry under open environment can be realized.
In one of the embodiments, Fig. 3 is referred to, second feed 150 includes LFM Source 152, solid-state times
Frequency chain 154 and Circular polarization horn 156, the LFM Source 152 are connected with the solid-state frequency multiplier chain 154, the solid-state frequency multiplication
Chain 154 is connected with Circular polarization horn 156；The LFM Source 152 is used to generate broadband signal；The solid-state frequency multiplier chain 154
For the broadband signal to be formed into frequency modulation continuous signal after the processing of frequency multiplication；The Circular polarization horn 156 is used for institute
State the transmitting of frequency modulation continuous signal.LFM Source is produced it is appreciated that the second feed 150 relies primarily on solid-state frequency multiplier chain 154
Broadband signal be amplified, by LFM Source generation broadband signal after 36 frequencys multiplication, generate 0.67THz generate
The transmission signal of 50GHz bandwidth.A series of CW with frequency modulation during the transmission signal of the generation, the CW with frequency modulation pass through
Conical-horn antenna directional transmissions with divergent lens are gone out.
The material of divergent lens described in a kind of application scenarios is politef.
In a kind of application scenarios, broadband signal is mainly carried out process of frequency multiplication by solid-state frequency multiplier chain 154 by frequency multiplier, together
When in order to increase frequency multiplier power capacity, using two three knot transfiguration Schottky diode reverse parallel connections.So there are two advantages,
First is that direct current biasing feed structure and radio frequency structure are made on same quartz base plate, can so save radio circuit
Gold wire bonding structure, reduce the uncertainty of circuit design；Second is that can realize radio frequency with a circuit structure in input section
LPF, and can realize Circuit Matching, reduce zig and then reduce the loss of radiofrequency signal in circuit.
Further, in order to ensure that the radiance of two feeds can be relatively independent, the Terahertz antenna system 10
Also include feed switching mechanism, for realizing the switching between two kinds of feeds.
Specifically, the feed switching mechanism can be switch device switches, gateway switching, relay switching etc..
Feed switching mechanism uses switch device switches described in an implementation wherein.
Further, the Terahertz antenna system 10 also includes lens 140, for will caused by the first feed 130 it is wide
Frequency Terahertz is combed to be collimated into line convergence；
Further, the subreflector 120 has frequency selection function, therefore the subreflector 120 is equivalent to frequency
Rate selects face (Frequency Selection Surface, hereinafter referred to as FSS).Traditional microwave FSS belongs to a kind of cycle knot
Structure, therefore focus on form and the arrangement of metamaterial structure unit 20 in one embodiment of the present of invention.
Specifically, the subreflector 120 (and FSS) is made up of Meta Materials, FSS units can be following two forms
Any one, first, metal patch is in periodic arrangement, another kind is that borehole is carried out on block of metal face, also in periodically
Arrangement.Specific form is such as designed generally according to the working characteristics of reality with reference to reflection and transmission.Mentioned above is super
Material is the composite Nano that some have the structure of engineer and show the extraordinary physical property not available for natural material
Material.And these properties, essentially from artificial special construction, the basis of the design of Meta Materials is by a variety of physics knots
Designing to break through the limitation of some apparent natural laws, so as to obtain extraordinary material function on structure.
In one of the embodiments, Fig. 4~Fig. 7 is referred to, the subreflector includes the Meta Materials of periodic arrangement
Construction unit 20, the shape of the metamaterial modular construction is varied, can be annular or one kind of rectangle.
Specifically, the metamaterial structure unit 20 is square, i.e., long L and wide W are isometric.
In one of the embodiments, the long L and wide W of the metamaterial structure unit 20 are 15 microns.
Specifically, the construction unit of the Meta Materials includes the first metal layer 202, coated by dielectric layer 204, second metal layer
206 and high frequency substrate 208, the first metal layer 202, coated by dielectric layer 204, second metal layer 206 be cascadingly set on
The surface of the high frequency substrate 208, the coated by dielectric layer 204 be located at the first metal layer 202 and second metal layer 206 it
Between.
In one of the embodiments, the first metal layer 202 is cross resonant ring, the brachium of the cross resonant ring
For L1, the wherein a width of W1 of arm, L1 adjustable length, span is 2 microns~10 microns, and W1 span is 13.6 microns
~15 microns, the second metal layer 206 is square, and long and wide span is 13.6 microns~15 microns, described the
The shape and area of the area L1*W1 of one metal level 202 value and the second metal layer 206 are unequal, and so described
Electric capacity can be formed between one metal level 202 and second metal layer 206, forms resonance structure.By the chi for adjusting two metal levels
Very little parameter can realize capacitance value.
In one of the embodiments, the wide W1 of arm for referring to Fig. 4 and Fig. 5 the first metal layers 202 is 13.6 microns, brachium
L is 2 microns~10 microns, corresponding, the length of second metal layer 206 and a width of 15 microns, the face of the first metal layer 202
Product is less than the area of second metal layer 206, and the whole high H of metamaterial structure unit is 1.27 microns, the first metal layer 202
In the side of whole Meta Materials combining unit 20.
In one of the embodiments, Fig. 6 and Fig. 7 are referred to, the wide W1 ' of arm of the first metal layer 202 ' is 15 microns, arm
Long L ' is 2 microns~10 microns, corresponding, the length of second metal layer 206 ' and a width of 13.6 microns, the first metal layer
202 ' area is more than the area of second metal layer 206 ', and the whole high H of metamaterial structure unit is 1.27 microns, first gold medal
Category layer 202 ' is located at the side of whole Meta Materials combining unit 20 '.
Further, the coated by dielectric layer 204 is overall square, is made up of insulating materials, the insulating materials can
Silica, polyimides, silicon nitride etc. are thought, wherein the growing method of the coated by dielectric layer uses plasma-reinforced chemical
Vapour deposition process, the vapour deposition process of the plasma-reinforced chemical is the excited gas in chemical vapor deposition, makes its production
Raw low temperature plasma, the chemism of intensified response material, so as to carry out a kind of method of extension.One embodiment wherein
In, the insulating materials is silica, and the length of side of the coated by dielectric layer 204 is 15 microns.
Further, the high frequency substrate 208 is Rogers's high frequency substrate.
Further, the gap 302 of the first metal layer 202 and second metal layer 206 can form electric capacity, refer to figure
8, the subreflector surface simultaneously because the metamaterial structure unit of a large amount of periodic arrangements tiles, therefore positioned at different super materials
Electric capacity can also be formed by expecting the gap 300 of the metal band of the same metal level of construction unit, be formed just because of electric capacity multiple
It is miscellaneous, it is general that such structure is analyzed using the means of Computer Simulation.
The Rotating fields of itself of metamaterial structure unit 20 form the inductance of series connection, the periodicity list of such large area
Meta structure forms the LC oscillating circuits of equivalent series, and the resonant frequency of the metamaterial structure unit is fm, expression is：
Wherein, electric capacity C is determined by the area of the first metal layer 202 and the thickness of coated by dielectric layer 204, inductance L2By first
The length L1 and width W1 of metal level 202 are determined.
Further, the size of metamaterial structure unit and resonant frequency fmIt is relevant.
In one of the embodiments, in order that specific frequency zero penetrates, the dielectric of the metamaterial structure unit 20 is normal
Number real part is on the occasion of magnetic conductivity real part is negative value.
The radiation direction of feed will meet certain requirement, and this is the reliable guarantor of the overall performance of Terahertz antenna system 10
Card, referring to Fig. 8, not plus before lens 140, first feed 130 is to multiple directions emittance, after adding lens,
Emulated under software HFSS softwares, the radiation direction of first feed 130 refers to Fig. 9, hence it is evident that enabled to have measured meeting
It is poly-.
Further, Figure 10 and Figure 11, second feed are referred to, it can be understood as the conical horn day with lens
Line is emulated under COMSOL engineering model, and the radiation direction of second feed is concentrated, the table of Circular polarization horn 156
The electric field and equipotential lines in face accordingly also compare concentration, while it is -23.188dB to enter to hold parameter value, the routine much smaller than -10dB
It is required that.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.The present invention specifically can apply to security fields, due to this hair
It is bright that there is double-fed source, can both produce for material detection wideband Terahertz frequency comb, can also produce at a distance into
The CW with frequency modulation of picture, the related field of national security is can be applied to, such as hidden explosive, hiding gun, postal
The detection for the illicit drug posted and quick security check for airport etc. but it is not limited to above-mentioned application.It should be pointed out that for
For one of ordinary skill in the art, without departing from the inventive concept of the premise, various modifications and improvements can be made,
These belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
- A kind of 1. Terahertz antenna system, it is characterised in that including：Main reflector, subreflector, the first feed, the second feed, The main reflector and subreflector are arranged at intervals, and first feed is arranged between main reflector and subreflector, described Second feed is arranged at side of the subreflector away from main reflector；First feed is used to produce wideband Terahertz frequency comb, and reflexes to subreflector；Second feed is used to produce frequency modulation continuous signal, and the frequency modulation continuous signal is launched to subreflector；The subreflector is used for wideband Terahertz frequency comb after assembling collimation and reflexes to main reflector, and the frequency modulation is connected Continuous signal is transmitted to main reflector；The main reflector carries out the high frequency THz wave of the wideband Terahertz frequency comb or the frequency modulation continuous signal again Secondary reflection.
- 2. Terahertz antenna system according to claim 1, it is characterised in that first feed cascades including Terahertz Laser, radio frequency injection module and exocoel resonance modules, the Terahertz cascaded laser are connected with the radio frequency injection module, The radio frequency injection module is connected with the exocoel resonance modules；The Terahertz cascaded laser is used to send THz wave；The radio frequency injection module is used for the frequency spectrum for widening the THz wave；The frequency spectrum that the exocoel resonance modules are used for the THz wave to widening samples, and forms the wideband Terahertz comb.
- 3. Terahertz antenna system according to claim 1, it is characterised in that second feed includes linear frequency modulation Source, solid-state frequency multiplier chain and Circular polarization horn, the LFM Source are connected with the solid-state frequency multiplier chain, the solid-state frequency multiplier chain with Circular polarization horn is connected；The LFM Source is used to generate broadband signal；The solid-state frequency multiplier chain is used to the broadband signal forming the frequency modulation continuous signal after the processing of frequency multiplication；The Circular polarization horn is used for the transmitting frequency modulation continuous signal.
- 4. Terahertz antenna system according to claim 1, it is characterised in that the main reflector is paraboloid structure, The subreflector is hyperboloid structure, and the main reflector is coaxially disposed with the subreflector and bending direction is identical, institute Main reflector is stated to overlap with the real focus of subreflector.
- 5. Terahertz antenna system according to claim 1, it is characterised in that the Terahertz antenna system also includes feedback Source switching mechanism and lens, the feed switching mechanism are used to realize the switching between feed；The lens and first feed It is disposed adjacent, the lens are used to wideband Terahertz comb caused by first feed carrying out standard.
- 6. Terahertz antenna system according to claim 4, it is characterised in that it is anti-that second feed is arranged at the master At the real focus that emitter overlaps with subreflector；First feed is arranged at the bi-curved virtual focus of subreflector.
- 7. Terahertz antenna system according to claim 1, it is characterised in that the subreflector includes periodic arrangement Metamaterial structure unit.
- 8. Terahertz antenna system according to claim 7, it is characterised in that the metamaterial structure unit includes first Metal level, coated by dielectric layer, second metal layer and high frequency substrate, the first metal layer, coated by dielectric layer, second metal layer and High frequency substrate is cascadingly set on the surface of the high frequency substrate, and the coated by dielectric layer is located at the first metal layer and the second gold medal Between category layer.
- 9. Terahertz antenna system according to claim 8, it is characterised in that the metamaterial structure unit is generally just Square, the first metal layer is cross, and the first metal layer is different with the shape and area of the second metal layer.
- 10. Terahertz antenna system according to claim 9, it is characterised in that the gap of the metamaterial structure unit Series capacitance is formed, the material structure unit belt structure forms series inductance, and periodicity metamaterial structure unit is formed Equivalent series LC oscillating circuits；The real part of permittivity of the metamaterial structure unit is just, magnetic conductivity real part is negative.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111900550A (en) * | 2020-08-31 | 2020-11-06 | 西安电子科技大学 | Impedance and phase dual-modulation fused dual-source super-surface high-directivity antenna |
| CN113759221A (en) * | 2021-08-27 | 2021-12-07 | 江苏省电力试验研究院有限公司 | Terahertz sensor chip for insulator monitoring and insulator monitoring method |
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