CN105846070A - Probe antenna for terahertz waveband near-field imaging - Google Patents
Probe antenna for terahertz waveband near-field imaging Download PDFInfo
- Publication number
- CN105846070A CN105846070A CN201610230231.0A CN201610230231A CN105846070A CN 105846070 A CN105846070 A CN 105846070A CN 201610230231 A CN201610230231 A CN 201610230231A CN 105846070 A CN105846070 A CN 105846070A
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- terahertz
- antenna
- probe antenna
- wave band
- radar imaging
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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Abstract
The invention discloses a probe antenna for terahertz waveband near-field imaging and specifically relates to surface metallized coating on a narrow edge of an antenna on the basis of polymethyl methacrylate (PMMA) material manufacture. The antenna comprises a terahertz signal couple input part, a terahertz resonant cavity and a PMMA surface metallized thin film coating layer. The antenna inputs a terahertz signal via a waveguide radiator, changes the transmission mode of the terahertz signal and further effectively changes terahertz electric-field radiation, thereby achieving the aim of terahertz near-field scanning imaging. The technical field of terahertz electronic devices is related. The probe antenna of the invention has the characteristics of having a simple structure, being easy to machine and manufacture and making it easy to perform couple operation with terahertz standard waveguide. The output power and the efficiency of the probe antenna of the invention are significantly superior to those of existing terahertz near-field scanning antennas. The probe antenna has wide market prospects in terms of material defect detection and material composition identification.
Description
Technical field
The present invention relates to a kind of probe antenna for terahertz wave band Near-Field Radar Imaging.
Background technology
THz wave be a kind of frequency from the electromagnetic wave of 0.1-10THz (wave-length coverage 0.03mm-3mm),
It between millimeter wave and far infrared, is in by electronics to photonic propulsion mistake in whole electromagnetic spectrum
Degree district.Compared with microwave and millimeter wave, THz wave wavelength is shorter, it is easy to accomplish significant signal bandwidth and
The narrowest antenna beam, and THz wave has the feature such as high-penetrability, unionized, these advantageous characteristic
THz wave is played in terms of material Non-Destructive Testing, material composition analysis and safety inspection important
Effect.
In recent years, along with scientific circles' highest attention to Terahertz Technology, the power of THz wave emission source
Become more and more ripe with efficiency, sending out of the THz continuous wave radar that utilization electronics frequency doubling technology is built
Radio frequency rate has reached 110GHz, average output power and has reached more than 200mW；Meanwhile, along with optics
The development of device, uses terahertz time-domain spectroscopy system to carry out too (TDS) hertz Near-Field Radar Imaging already
Having obtained quick development, its operating frequency has reached 10THz.These all make THz wave for material
The spatial resolution of imaging during detection can be improved significantly, but be limited to the Rayleigh scattering limit,
Common imaging radar resolution with the relation of wavelength is:
Wherein, λ is Terahertz wavelength, and α is constant.When α is close to 1, the imaging resolution of radar is almost
Reach the highest.In order to break through this diffraction limit, compare the method in forward position be use TDS system building based on
The optical microscope for scanning near field of scattering formula realizes.
But, either make optically or the method for microwave electron frequency multiplication be to carry out Near-Field Radar Imaging,
Antenna directly affects the globality of radar system as last element of system, the quality of its design
Energy.At present, the antenna being commonly used in Terahertz Near-Field Radar Imaging has: co-planar probe and coaxial line metal pass
Defeated line, metal waveguide based on resonant slots antenna and the dielectric resonator of metal coating, the first probe sky
The working frequency range scope of line is up to 100GHz, but manufacturing process and metal transmission line make it make
Difficulty increases, and its high lossy makes Terahertz electric field well not utilized, the second probe antenna
Owing to resonant slots is limited by single natural resonance frequency, it is difficult to reach in Terahertz Near-Field Radar Imaging field
To ultra broadband characteristic.Therefore, seek that one is prone to processing and fabricating, capacity usage ratio is high and bandwidth is relatively wide
Terahertz Near-Field Radar Imaging antenna be particularly important.
Summary of the invention
Present invention analysis based on background above technology, it is provided that a kind of Terahertz Near-Field Radar Imaging that can be used in
Probe antenna, its operating frequency is terahertz wave band, it is intended to solve prior art middle probe antenna efficiency low,
The problem that machinery production difficulty is big.
The present invention includes terahertz signal coupling importation, Terahertz resonator cavity and PMMA surface metal
Thin film coating, described signal coupling importation and Terahertz resonator cavity all use PMMA as substrate material
Expecting, it is in the nature Medium Wave Guide, and PMMA surface metallic film coating includes 10nm titanium tack coat, 0.6 μm
Aluminum and 0.1 μm gold.Coupling importation is used for receiving the terahertz signal of standard rectangular waveguide feed-in, too
Hertz resonator cavity is used for being amplified terahertz signal and transmitting signals in free space, PMMA
Surface metal plating layer is used for being converted into the terahertz signal of input the basic mode of Medium Wave Guide, PMMA material
Dielectric constant when 110GHz is 2.6, and dielectric loss is 0.003.
Described coupling importation is shaped as cuboid, and end face cross-sectional area is a=2mm, b=1mm, length
For L=10mm, one of them end face is used for coupling the rectangular waveguide of standard model, and the other end connects terahertz
Hereby resonator cavity, limit narrow to cuboid (limit of b=mm) carries out metal coating.
Described Terahertz resonator cavity be shaped as positive rectangular pyramid, its input and the outfan coupling importation
Carrying out seamless link, limit narrow to vertebral body carries out metal coating.
The input end face a size of 2x1mm of described Terahertz resonator cavity2, horizontal length is S=3mm, cone
Output end face a size of 60x60 μm2。
The described PMMA surface coat of metal is respectively the titanium tack coat of 10nm thickness, 0.6 μ m-thick from the inside to surface
Aluminium lamination and the golden protective layer of 0.1 μ m-thick, the length of metal film and wide couple with Terahertz importation and
The narrow limit consistent size of Terahertz resonator cavity.
The titanium tack coat of described PMMA surface technology coating is 42 μ Ω .cm in the resistivity of temperature 20oC,
The resistivity of aluminum is 2.65 μ Ω .cm, and the resistivity of gold is 2.4 μ Ω .cm.
The cross section ratio of described terahertz signal coupling importation is except setting by above-mentioned design parameter size
Outside, can be by changing the signal coupling demand that its size meets the standard waveguide of different model.
When the present invention works, the probe antenna of making is directly connected to the rectangular waveguide of extraneous standard model, extraneous
The terahertz signal launched enters antenna by coupling importation, and changes its work by signal resonator cavity
Operation mode and then be radiated outside free space.
The invention has the beneficial effects as follows: machinery production is simple, and the input electric field of probe antenna has obtained significantly
Strengthen, the cross sectional dimensions of couple input can be easily changed by adapt to various different standard
Rectangular waveguide, and then be mountable on terahertz imaging radar equipment.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment 1.
Fig. 2 is the PMMA surface metal coating schematic diagram of embodiment 1.
Fig. 3 be in embodiment 1 electric field intensity with the Changing Pattern of propagation distance
Fig. 4 is that the electric field intensity of embodiment 1 is at Y-O-Z mapping.
Fig. 5 is that the electric field intensity of embodiment 1 is at X-O-Z mapping.
Fig. 6 is the S11 schematic diagram of the couple input of embodiment 1.
Fig. 7 is the standing-wave ratio schematic diagram of the couple input of embodiment 1.
Fig. 8 is the structural representation of embodiment 2.
Fig. 9 is that the electric field intensity of embodiment 2 is at Y-O-Z mapping.
Wherein: 1-couples importation, 2-Terahertz resonator cavity, 3-PMMA metal-coated surface, 4-titanium
Tack coat, 5-aluminum working lining, 6-gold protective layer.
Detailed description of the invention
The invention will be further described with example below in conjunction with the accompanying drawings, embodiments of the present invention include but
It is not limited to following embodiment.
Embodiment 1: this example utilizes CST (Computer Simulation Technology) company of Germany
3 D electromagnetic field simulation software CST MICROWAVE STUDIO (microwave studio) to the present embodiment
It is simulated simulation analysis.In CST, first set up the probe antenna model of a terahertz wave band.
This example prepares antenna in the following manner: the first step, makes required size by micro-nano technology technology
Terahertz coupling importation and Terahertz resonator cavity cavity；Second step, uses and steams empty coater respectively
Metal-coated surface operation is carried out, from the inside to surface on the narrow limit of coupling input waveguide and Terahertz resonant cavity
It is respectively titanium tack coat, aluminum working lining and gold protective layer, and then makes probe sky, required THz wave near field
Line.
As illustrated in fig. 1 and 2, this example includes that Terahertz couples importation 1, Terahertz resonator cavity 2 and
PMMA surface metal coating 3, titanium tack coat 4, aluminum working lining 5 and gold protective layer 6.Coupling input unit
Point resonant cavity carries out seamless link after carrying out coating operation respectively again.Defeated due to antenna external signal
Enter the rectangular metal hollow waveguide of standard to be used, so coupling setting of the face size size of importation
Meter must consider the dielectric constant of medium, dielectric loss and the working frequency range of antenna.Waveguide to be made is operated in
Main mould TE10 mould, the cut-off frequency of its Antenna Operation must meet following formula:
Wherein, a is the broadside of rectangular waveguide, and μ is the pcrmeability of medium, is set to 1 in the present invention,
ε is the medium complex dielectric permittivity at operating frequency of antenna, selects PMMA material conduct in the present embodiment
Coupling importation and the filled media of Terahertz resonator cavity, operating frequency is set to 110GHz, dielectric
Constant real part is set to 2.6, and dielectric loss is 0.003；The cross sectional dimensions of coupling importation is set to
2x1mm2, a length of 10mm.
The input signal of Terahertz resonant cavity be derived from coupling importation above and with its seamless link,
It is shaped to positive rectangular pyramid, and front end face width is 2x1mm2, horizontal length is 3mm, resonator cavity
Outfan cross sectional dimensions size be 60x60 μm2.When from standard rectangular waveguide terahertz signal feed-in coupling
After closing importation 1, by surface, narrow limit gold outside coupling importation 1 and Terahertz resonant cavity
Belonging to plated film and TE10 mould can be converted into the Q-TEM mould of microstrip line, now direction of an electric field will be perpendicular to antenna
Narrow limit is propagated；Cavity is set to positive rectangular pyramid model, THz wave edge in cavity can be reduced
The natural impedance of needle point propagation and make it remain stable.
PMMA surface metal coating selects as Figure 4-Figure 6, select 10nm titanium as tack coat, with
The aluminum of rear addition 0.6 μm is as working lining, and outermost layer is that the gold of 0.1 μ m-thick is as protective layer, centre aluminum work
The selection gist making layer thickness is that the skin depth under microwave frequency is carried out, it may be assumed that
, f is the actual operating frequency of antenna, and σ is the electrical conductivity of aluminum.
When the narrow limit of antenna being carried out metal coating with the empty coater of steaming, the part of plated film must not carry out spy
Different protection, protects with polytetrafluorethylecoatings coatings at this.
Fig. 3 be antenna when operating frequency is 110GHz electric field intensity at inner antenna with the change of propagation distance
Law analogous diagram, it is possible to see that the tip end electric field intensity at resonator cavity obtains substantially with clearing
Strengthen.
Fig. 4 is the antenna scattergram of the electric field intensity in Y-O-Z face, Fig. 5 when operating frequency is 110GHz
For its X-O-Z face electric-field intensity distribution figure, needle point has strong-focusing effect, beam angle to electric field
It is about outfan cross sectional dimensions 60.
Fig. 6 is the S11 Changing Pattern with operating frequency of antenna, and when 110GHz, size is about-17dB, figure
7 is the antenna standing wave ratio Changing Pattern when 110GHz, and when 110GHz, standing-wave ratio is about 1.35.
The ratio of embodiment 2: in the present embodiment, the beam size of antenna transmitting terminal and needle point port cross section
Relevant, in the case of other external conditions are constant, as shown in Figure 8, only change needle point tip cross section
Length-width ratio be 0.02x1mm2, its electric field intensity is in Y-O-Z interface such as Fig. 9 institute that inner antenna is propagated
Showing, the beamwidth of tip end is directly proportional to the width of port.
Claims (10)
1. the probe antenna for terahertz wave band Near-Field Radar Imaging, it is characterised in that: it is by Terahertz
Signal coupling importation (1), Terahertz resonator cavity (2) and PMMA surface metallic film coating (3)
Composition.
2., according to a kind of probe antenna for terahertz wave band Near-Field Radar Imaging described in claim 1, it is special
Levy and be: described terahertz signal coupling importation is shaped as cuboid, and input cross section ratio is
2x1mm2, a length of 10mm.
3., according to a kind of probe antenna for terahertz wave band Near-Field Radar Imaging described in claim 1, it is special
Levy and be: the coupled signal input wavelength of described terahertz signal coupling importation (1) is operated in too
Near He Zi.
4., according to a kind of probe antenna for terahertz wave band Near-Field Radar Imaging described in claim 1, it is special
Levy and be: the making material of described terahertz signal coupling importation (1) is PMMA.
5., according to a kind of probe antenna for terahertz wave band Near-Field Radar Imaging described in claim 1, it is special
Levy and be: described Terahertz resonator cavity (2) be shaped as positive rectangular pyramid, conical surface input cross sectional dimensions
For 2x1mm2, vertebral body horizontal length is 3mm.
6. according to a kind of probe antenna for terahertz wave band Near-Field Radar Imaging described in claim 1, its
It is characterised by: the Terahertz input immediately terahertz signal coupling input of described Terahertz resonator cavity (2)
The partly outfan of (1), works in main mould pattern.
7., according to a kind of probe antenna for terahertz wave band Near-Field Radar Imaging described in claim 1, it is special
Levy and be: the cavity cone outfan a size of 60x60 μm of described Terahertz resonator cavity (2)2。
8., according to a kind of probe antenna for terahertz wave band Near-Field Radar Imaging described in claim 1, it is special
Levy and be: the making material of described Terahertz resonator cavity (2) is PMMA.
9. according to a kind of probe antenna for terahertz wave band Near-Field Radar Imaging described in claim 1, its
It is characterised by: the coat of metal material of described PMMA surface metallic film coating (3) is entirely located in antenna
Narrow limit.
10. according to a kind of probe antenna for terahertz wave band Near-Field Radar Imaging described in claim 1, its
It is characterised by: described PMMA surface metallic film coating (3) comprises the titanium tack coat that 10nm is thick
(4), 0.6 μm aluminium lamination (5) and 0.1 μm gold are as protective layer (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610230231.0A CN105846070A (en) | 2016-04-13 | 2016-04-13 | Probe antenna for terahertz waveband near-field imaging |
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| CN201610230231.0A CN105846070A (en) | 2016-04-13 | 2016-04-13 | Probe antenna for terahertz waveband near-field imaging |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107144950A (en) * | 2017-05-12 | 2017-09-08 | 深圳市太赫兹科技创新研究院 | Terahertz Near-Field Radar Imaging is popped one's head in and Terahertz near field imaging system |
| CN107462546A (en) * | 2017-07-25 | 2017-12-12 | 天津大学 | Multi-functional terahertz time-domain spectroscopy imaging device based on femtosecond laser |
| CN108226575A (en) * | 2017-11-29 | 2018-06-29 | 北京大学 | A kind of Terahertz broadband super-resolution probe and its detection method |
| CN110333472A (en) * | 2019-07-25 | 2019-10-15 | 北京无线电计量测试研究所 | A kind of Terahertz probe transient response calibration method and system based on three position models |
| CN110441723A (en) * | 2019-08-29 | 2019-11-12 | 北京无线电计量测试研究所 | A kind of Terahertz probe transient response calibration method and device |
| CN110531297A (en) * | 2019-08-28 | 2019-12-03 | 北京无线电计量测试研究所 | A kind of Terahertz probe transient response calibration method and system based on single position model |
| EP3522294A4 (en) * | 2016-09-30 | 2020-06-10 | Daikin Industries, Ltd. | Dielectric waveguide line, connection structure and method for producing dielectric waveguide line |
| CN113767532A (en) * | 2019-12-20 | 2021-12-07 | 赫尔穆特费舍尔股份有限公司电子及测量技术研究所 | Device for emitting and/or receiving terahertz radiation and use thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3522294A4 (en) * | 2016-09-30 | 2020-06-10 | Daikin Industries, Ltd. | Dielectric waveguide line, connection structure and method for producing dielectric waveguide line |
| US10944146B2 (en) | 2016-09-30 | 2021-03-09 | Daikin Industries, Ltd. | Dielectric waveguide having a dielectric waveguide body and a dielectric waveguide end with specified densities and method of producing |
| CN107144950A (en) * | 2017-05-12 | 2017-09-08 | 深圳市太赫兹科技创新研究院 | Terahertz Near-Field Radar Imaging is popped one's head in and Terahertz near field imaging system |
| WO2018205759A1 (en) * | 2017-05-12 | 2018-11-15 | 深圳市太赫兹科技创新研究院 | Terahertz near-field imaging probe and terahertz near-field imaging system |
| CN107462546A (en) * | 2017-07-25 | 2017-12-12 | 天津大学 | Multi-functional terahertz time-domain spectroscopy imaging device based on femtosecond laser |
| CN108226575A (en) * | 2017-11-29 | 2018-06-29 | 北京大学 | A kind of Terahertz broadband super-resolution probe and its detection method |
| CN108226575B (en) * | 2017-11-29 | 2019-09-13 | 北京大学 | A kind of Terahertz broadband super-resolution probe and its detection method |
| CN110333472A (en) * | 2019-07-25 | 2019-10-15 | 北京无线电计量测试研究所 | A kind of Terahertz probe transient response calibration method and system based on three position models |
| CN110531297A (en) * | 2019-08-28 | 2019-12-03 | 北京无线电计量测试研究所 | A kind of Terahertz probe transient response calibration method and system based on single position model |
| CN110531297B (en) * | 2019-08-28 | 2021-03-19 | 北京无线电计量测试研究所 | Terahertz probe transient characteristic calibration method and system based on single-position model |
| CN110441723A (en) * | 2019-08-29 | 2019-11-12 | 北京无线电计量测试研究所 | A kind of Terahertz probe transient response calibration method and device |
| CN113767532A (en) * | 2019-12-20 | 2021-12-07 | 赫尔穆特费舍尔股份有限公司电子及测量技术研究所 | Device for emitting and/or receiving terahertz radiation and use thereof |
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