CN204205039U - A kind of high power remote Terahertz paraboloid of revolution directional transmitting antenna - Google Patents
A kind of high power remote Terahertz paraboloid of revolution directional transmitting antenna Download PDFInfo
- Publication number
- CN204205039U CN204205039U CN201420310865.3U CN201420310865U CN204205039U CN 204205039 U CN204205039 U CN 204205039U CN 201420310865 U CN201420310865 U CN 201420310865U CN 204205039 U CN204205039 U CN 204205039U
- Authority
- CN
- China
- Prior art keywords
- antenna
- terahertz
- lens
- transmitting antenna
- feed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Aerials With Secondary Devices (AREA)
Abstract
The utility model provides a kind of high power remote Terahertz paraboloid of revolution directional transmitting antenna, wherein, described antenna comprises femto-second laser, terahertz light lead antenna, silicon substrate lens and rotary parabolic terrestrial transmitter, described silicon substrate lens are arranged on above terahertz light lead antenna, described femto-second laser excites terahertz light lead antenna to produce terahertz emission, as the feed of rotary parabolic terrestrial transmitter after terahertz emission is converged by silicon substrate lens.The utility model has that size is little, lightweight, structure is simple, easy of integration, because its volume is a little small, terahertz emission is assembled through lens can eliminate as feed the surface wave effect that photoconducting antenna causes well; The emitted energy direction of antenna system is more concentrated, and gain is larger; Terahertz emission is by after paraboloidal mirror, and the spherical radiation that photoconducting antenna produces is converted into equiphase plane wave; Effectively realize high-gain, and there is the advantages such as low sidelobe.
Description
[technical field]
The utility model relates to Terahertz field, particularly a kind of rotary parabolic surface antenna for the remote Terahertz directional transmissions of high power.
[background technology]
The high-power emission source of Terahertz is the difficult point of Terahertz research field always.In October, 2013, one group of researcher of Austria Vienna technology university produces a kind of novel quantum cascade laser, successfully outputs the terahertz emission of 1 watt, has broken the world record of 0.25 watt kept by Massachusetts Institute Technology before this.As can be seen here, the lifting difficulty of THz source power is very large, thus how to improve Terahertz output system efficiency, how to design Terahertz directional transmitting antenna most important for efficiency utilization THz source.Research Terahertz directional transmissions is the key technology realizing Terahertz long-range detection, and a lot of scientific research personnel carried out the research of this respect.
1992, the people such as Joakim devised a kind of diagonal form horn antenna, and its dihedral chamber is obtained by splicing after two metal sheets grooving, and radiation efficiency reaches 84%.2006, the people such as Douvalis devised the integrated conical horn array antenna of a kind of 95GHz.2008, the people such as Yu-Juen Ren, on the basis of plane butterfly antenna, adopt SiC to make substrate, to improve radiation frequency, experimental result shows that the relative bandwidth of butterfly antenna is 164% in 1 to 10THz, and radiation gain on average improves 2.2dB than dipole antenna.Because above-mentioned antenna manufacture craft is simple, Terahertz directional antenna research before focuses mostly in these areas.According to antenna theory, want to obtain higher gain and stronger directivity, then antenna will be relatively large relative to the ratio of wavelength, analyze common antenna form, the size of element antenna is generally-λ (for wavelength), traveling-wave antenna is of a size of λ-10 λ, and the size of aperture antenna is generally λ-1000 λ.Visible, aperture antenna is the antenna form being best suited for Terahertz frequency range.
But the effect of above-mentioned antenna in the high-gain realized and narrow beam characteristic is unsatisfactory.
[utility model content]
The purpose of this utility model is the defect overcoming prior art, provides a kind of high-gain, has the remote Terahertz directional transmitting antenna of good narrow beam characteristic.
To achieve these goals, the utility model provides a kind of high power remote Terahertz paraboloid of revolution directional transmitting antenna, wherein, described antenna comprises femto-second laser, terahertz light lead antenna, silicon substrate lens and rotary parabolic terrestrial transmitter, described silicon substrate lens are arranged on above terahertz light lead antenna, described femto-second laser excites terahertz light lead antenna to produce terahertz emission, as the feed of rotary parabolic terrestrial transmitter after terahertz emission is converged by silicon substrate lens.
According to the particularly preferred embodiment of one, silicon substrate lens are HR-Si substrate lens.
More preferably, the refractive index of HR-Si substrate lens is 3.418,45 degree, critical radiation angle.
In the utility model, the hyper-hemispherical lens focus of the silicon substrate lens of HR-Si substrate lens and top distance are the lens radius of 1.414 times.
In the magnitude relationship of lens sizes and dipole antenna, both are proportional relations, and the size proportional relation with operating frequency again of dipole antenna, so the size of lens depends on operating frequency.
Along with the increase of lens radius, the gain of antenna can increase, but when lens sizes large to a certain extent after, the speed that gain increases just slows down, and substantially remains unchanged finally.This phenomenon is understood very well, and lens play converging action, and radius is larger, and converging action is stronger, and energy dissipation is fewer, and gain is stronger.When lens sizes is large, the energy of radiate source radiation has substantially all been assembled by lens to a certain extent, and the energy scattered and disappeared is little, so the gain of antenna just no longer significantly improves.Fig. 3 is lens radius and antenna gain graph of relation under 0.21 Terahertz.
Because radiation source model now will as the feed of reflector antenna, the entire gain of antenna is that feed and reflecting surface acting in conjunction determine, so be not that the gain of now radiation source is larger, the gain of the antenna designed below is larger.Considering that this dipole antenna adds the built-up pattern of convergent lens will as the attribute of the feed of reflector antenna, and we will determine suitable lens sizes from this angle of the requirement of feed.
First, the bore of feed is smaller as far as possible, and reduce blocking reflecting surface, otherwise main lobe gain can decline, secondary lobe gain can be increased as far as possible.Although so the larger gain of lens sizes is larger, the bore of lens can not be very large.
Secondly, certain requirement that the directional diagram of feed preferably meets, this is the Reliable guarantee of whole antenna system performance.First be the best one-way radiation of feed but not bidirectional radiation, avoid and the wave beam generation aliasing be reflected back; Its secondary Rotational Symmetry, because last whole antenna system also should be rotational symmetric; Last minor level is low as far as possible, reduces useless power dissipation, ensures the gain of main lobe.When lens radius is 0.45mm, radiation source bidirectional radiation, the THz wave can returned with reflective surface forms aliasing, is not suitable for the feed as reflector antenna; When lens radius is 1.5mm, the secondary lobe of radiation source is comparatively large, does not meet the feed requirement of low-sidelobe level, so be also not suitable as feed; When lens radius is 0.5mm, the three-dimensional figure of radiation source is one-way radiation, and main lobe gain is large, secondary lobe gain is little, and Rotational Symmetry, is suitable as the feed of reflector antenna very much.
As can be seen here, in optimizing process in this section, the gain of radiation source is not pursue the target optimized, and the optimization of gain needs to combine Antenna Design below, antenna system is optimized as a whole.Therefore pursuing what optimize is the directional diagram of radiation source, is ensureing, under certain gain condition, to make radiation source model most suitable as the feed of reflector antenna.
Particularly preferably, the diameter 1 millimeter of HR-Si substrate lens.
According to a kind of preferred implementation of the present utility model, described rotary parabolic terrestrial transmitter is aluminum rotary parabolic terrestrial transmitter.
On the other hand, the people such as Llombart in 2012 propose to utilize existing photoconducting antenna structural model, make to maintain a certain distance between itself and hyper-hemispherical lens, can improve the radiation efficiency of antenna like this.
So, the graph of a relation of antenna to lens distance and antenna gain can be obtained by regulating antenna to the distance of lens surface, as shown in Figure 4.
Fig. 4 can find out: when dipole antenna is close to the lens back side, and the now gain of antenna is minimum.When the distance at the dipole antenna distance lens back side increases, the gain of antenna increases gradually, but growth is that be nonlinear, be increased to certain distance, gain reaches maximum, and then gain declines again gradually first quick and back slow.
This phenomenon is very natural, dipole antenna is close to the lens back side, the THz wave given off easily is made the gain of lens front surface smaller by reflection, after distance certain distance, because THz wave incident angle reduces, the volume reflection that THz wave occurs at the lens back side reduces, and gain is increased gradually, in distance for reaching maximum during 0.036mm.Afterwards, distance continues to increase, dipole antenna from lens distance more and more away from, have quite a few energy not enter convergent lens to surrounding divergence loss, so the gain reduction of antenna.So dipole antenna can not be close to the lens back side, the distance from the lens back side can obtain best gain when an appropriate value.
Point out that the optimization of lens sizes should not pursue the maximum gain of feed self for target when optimization lens sizes before, because if covet maximum gain, antenna pattern there will be bidirectional radiation, shape distortion, secondary lobe higher, block the series of problems such as reflection, so this size will be optimized in conjunction with the antenna system of final integral.But when optimizing dipole antenna to lens distance, the maximum gain of feed self can will be pursued as optimization aim.This is because regardless of dipole antenna to lens distance, the size of gain how, and through simulating, verifying, the antenna pattern of radiation source model is all very close, meets all requirements as good feed.When distance is 0.01mm, 0.02mm and 0.037mm, the radiation mode of the three-dimensional figure of radiation source is close, particularly distance is 0.037mm, when namely reaching maximum gain, radiation effect is best, main lobe energy is very concentrated, the optimized effect obtained after the lens sizes that has been complex optimum and dipole antenna to these two parameters of lens distance.
On the other hand, lens are positioned in the focus of reflecting surface.Focal length and bore diameter are relevant, general satisfaction:
f＝(0.25～0.5)D
0
If the gain of reflecting face edge is-10dB, so reflecting surface can reach best irradiation with mating of feed.So get f=0.5D
0, it is corresponding that emulation obtains-10dB line
in order to ensure that gain is large as far as possible, we reserve certain allowance
Therefore, in the utility model, the distance of described feed and rotary parabolic terrestrial transmitter meets f=(0.25 ~ 0.5) D
0, wherein D
0it is paraboloidal bore.Preferably meet f=0.5D
0, i.e. 0.5 times of parabola diameter.
In the utility model, terahertz light lead antenna is connected with metal electrode by feed switching integration module.Preferably, described metal electrode is copper metal electrode.
Terahertz light lead antenna to be connected with metal electrode by feed switching integration module and to belong to prior art, does not repeat at this.
In the utility model, HR-Si substrate lens are that acquisition product can be bought in market, the High Resistivity Si lens products that such as east flash of light (Beijing) Electro-optical Technology, INC. (US) 62 Martin Road, Concord, Massachusetts 017 sells.
Terahertz light lead antenna is the product that can obtain in prior art, or the technology of enforcement can be repeated according to the content that prior art is recorded, the people such as such as Liu Hong, Xi'an University of Technology's journal, 27 volumes the 3rd phase in 2011, technology disclosed in " the preparation and property research of GaAs terahertz light lead antenna ".
Usually adopt horn antenna in microwave technology as compared with feed with the feed of the Terahertz reflector antenna of prior art, in Terahertz frequency range, the utility model scioptics converge, antenna is not only made to have size advantage little, lightweight, easy of integration, but also the surface wave effect of flat plane antenna when Terahertz produces can be eliminated, be the desirable feed of reflector antenna.Therefore, using lens antenna as feed, using the paraboloid of revolution as reflector, be the ideal directional antenna of this frequency range of Terahertz.
[accompanying drawing explanation]
Fig. 1-1,1-2 are the antenna system configuration schematic diagram of embodiment 1; Its middle and upper part is dipole antenna, and bottom is lens;
Fig. 2 is gain curve figure;
Fig. 3 is lens radius and antenna gain graph of relation under 0.21 Terahertz;
Fig. 4 is the graph of a relation that antenna arrives lens distance and antenna gain.
[embodiment]
Following examples are used for explaining the technical solution of the utility model without limitation.
Embodiment 1
Antenna as shown in Figure 1, comprise antenna and comprise femto-second laser, terahertz light lead antenna, silicon substrate lens and rotary parabolic terrestrial transmitter, femto-second laser excites terahertz light lead antenna to produce terahertz emission, as feed after terahertz emission is converged by lens.
As shown in Figure 2, gain design is 40dB, and centre frequency is 0.21THz, and frequency range is from 0.2THz to 0.22THz, and this frequency range is that in air, steam absorbs more weak window frequency to Terahertz just.Caliber size is 58.5mm, focal length 29.2mm, emulation obtain-10dB line corresponding be 45 degree, therefore this antenna system is about 53 degree.
The terahertz emission (assembling through lens) send feed and the terahertz emission of parabolic reflector obtain its three-dimensional energy figure respectively.
As a comparison, remove HR-Si substrate lens, the terahertz emission directly terahertz light lead antenna excited, as feed, tests its three-dimensional energy figure after parabolic reflector.
Contrast can be found out:
1, assemble through lens and can eliminate as feed the surface wave effect that photoconducting antenna causes well;
2, the lens sizes of the present embodiment is little, lightweight, structure is simple, easy of integration, because its volume is small, the electromagnetic field of returning to parabolic reflector can not cause and block, and can realize higher transmitting quality;
3, lens are very remarkable as feed effect, and when having convergent lens as feed, the emitted energy direction of antenna system is more concentrated, and gain is larger.
4, by after paraboloidal mirror, the spherical radiation that photoconducting antenna produces is converted into equiphase plane wave, for subsequent applications (as dangerous chemical detection and imaging) brings convenience.
5, paraboloidal mirror can realize high-gain, and has the advantages such as low sidelobe, still very small and exquisite portable in Terahertz frequency range, has very strong practicality.
Claims (9)
1. a high power remote Terahertz paraboloid of revolution directional transmitting antenna, it is characterized in that described antenna comprises femto-second laser, terahertz light lead antenna, silicon substrate lens and rotary parabolic terrestrial transmitter, described silicon substrate lens are arranged on above terahertz light lead antenna, described femto-second laser excites terahertz light lead antenna to produce terahertz emission, as the feed of rotary parabolic terrestrial transmitter after terahertz emission is converged by silicon substrate lens.
2. directional transmitting antenna according to claim 1, is characterized in that silicon substrate lens are HR-Si substrate lens.
3. directional transmitting antenna according to claim 1, is characterized in that the refractive index of HR-Si substrate lens is 3.418,45 degree, critical radiation angle.
4. directional transmitting antenna according to claim 1, is characterized in that the hyper-hemispherical lens focus of silicon substrate lens and top distance are the lens radius of 1.414 times.
5. directional transmitting antenna according to claim 1, is characterized in that described rotary parabolic terrestrial transmitter is aluminum rotary parabolic terrestrial transmitter.
6. directional transmitting antenna according to claim 1, is characterized in that the distance of described feed and rotary parabolic terrestrial transmitter meets f=(0.25 ~ 0.5) D
0, wherein D
0it is paraboloidal bore.
7. directional transmitting antenna according to claim 1, is characterized in that the distance of described feed and rotary parabolic terrestrial transmitter meets f=0.5D
0.
8. directional transmitting antenna according to claim 1, is characterized in that described terahertz light lead antenna is connected with metal electrode by feed switching integration module.
9. directional transmitting antenna according to claim 8, is characterized in that described metal electrode is copper metal electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420310865.3U CN204205039U (en) | 2014-06-12 | 2014-06-12 | A kind of high power remote Terahertz paraboloid of revolution directional transmitting antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420310865.3U CN204205039U (en) | 2014-06-12 | 2014-06-12 | A kind of high power remote Terahertz paraboloid of revolution directional transmitting antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204205039U true CN204205039U (en) | 2015-03-11 |
Family
ID=52662962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420310865.3U Expired - Fee Related CN204205039U (en) | 2014-06-12 | 2014-06-12 | A kind of high power remote Terahertz paraboloid of revolution directional transmitting antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204205039U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104112900A (en) * | 2014-06-12 | 2014-10-22 | 清华大学 | High-power far-distance terahertz rotation paraboloid orientation emission antenna |
| CN110534876A (en) * | 2019-07-23 | 2019-12-03 | 西安空间无线电技术研究所 | A kind of reflector antenna and preparation method thereof |
-
2014
- 2014-06-12 CN CN201420310865.3U patent/CN204205039U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104112900A (en) * | 2014-06-12 | 2014-10-22 | 清华大学 | High-power far-distance terahertz rotation paraboloid orientation emission antenna |
| CN110534876A (en) * | 2019-07-23 | 2019-12-03 | 西安空间无线电技术研究所 | A kind of reflector antenna and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103441335B (en) | Broadband wire source for planar waveguide CTS antenna feed device | |
| CN108110404B (en) | Large-caliber planar achromatic reflective array antenna | |
| EP3109941B1 (en) | Microwave antenna with dual reflector | |
| CN104103911B (en) | Millimeter-wave dual reflector antenna capable of focusing near-field wave beam | |
| US3430244A (en) | Reflector antennas | |
| CN214153216U (en) | Ka wave band broadband folding type planar reflective array antenna | |
| CN106654594A (en) | Terahertz transmitting antenna system | |
| CN108899637A (en) | A kind of High-Power Microwave mould relay antenna based on diffraction periodic structure | |
| CN110165403A (en) | Hemisphere dielectric lens antenna is deformed based on array-fed large-angle scanning | |
| CN204205039U (en) | A kind of high power remote Terahertz paraboloid of revolution directional transmitting antenna | |
| CN105529538B (en) | A kind of high power millimeter wave broadband mode converter based on continuous optical grating construction | |
| CN104717019A (en) | High-precision collimation optical antenna transmitting system capable of loading radial radiation light source | |
| CN206602184U (en) | Terahertz sources antenna system | |
| CN104112900A (en) | High-power far-distance terahertz rotation paraboloid orientation emission antenna | |
| Huang et al. | Realization of low-RCS parabolic reflector antenna using curved 3-D frequency-selective structure | |
| CN114665274A (en) | Dielectric lens loaded broadband high-gain double-ridge horn antenna | |
| Yahyaoui et al. | Design and comparative analysis of ultra-wideband and high directive antennas for THz applications | |
| Wu et al. | A novel conical horn antenna loaded with ball cone dielectric | |
| CN102868088A (en) | Device and method for enhancing feedback of external cavity feedback spectrum beam combination semiconductor laser | |
| CN207442544U (en) | Laser radio charging unit based on kaleidoscope homogenizer technology | |
| TW202135427A (en) | System and method for long-range wireless power transfer | |
| RU2580461C2 (en) | Antenna device | |
| Du et al. | Wide-flared corrugated horn designed for the SKA dish | |
| CN102269832B (en) | Terahertz wave positive focusing mirror | |
| CN110197039B (en) | Ring-focus elliptical beam reflector antenna design method based on aperture electric field distribution |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150311 Termination date: 20150612 |
|
| EXPY | Termination of patent right or utility model |