本文關(guān)鍵詞：基于人工視覺技術(shù)的太赫茲天線設(shè)計與研究　出處：《北京郵電大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 人工視覺 視覺假體 太赫茲 天線

【摘要】：在科學(xué)發(fā)展給人類帶來極大便利的21世紀(jì),視覺殘疾患者和盲人由于視覺受損,不能通過視覺感知世界以充分享受美好的生活,視覺疾患給有關(guān)家庭帶來的不只是生活的艱辛更是心靈的傷痛。把快速發(fā)展的先進太赫茲天線技術(shù)應(yīng)用到人工視覺修復(fù)系統(tǒng)的研制上,為失明者重獲視力帶來新的希望,具有重大的社會價值和廣闊的應(yīng)用前景。為了更好地實現(xiàn)太赫茲天線技術(shù)與人工視覺系統(tǒng)結(jié)合,本文主要研究內(nèi)容如下： 1.人工視覺修復(fù)系統(tǒng)的理論研究 調(diào)研國內(nèi)外人工視覺修復(fù)技術(shù)與應(yīng)用,研究了人工視覺修復(fù)系統(tǒng)的組成結(jié)構(gòu)、類型劃分和關(guān)鍵技術(shù),采用將THz天線技術(shù)應(yīng)用于人工視覺系統(tǒng)視覺信號提取前端的方式提升了系統(tǒng)性能。 2.太赫茲天線理論研究 通過基礎(chǔ)天線理論的學(xué)習(xí),了解到天線各項參數(shù)的實際意義。在太赫茲天線的設(shè)計過程中采用了反射面技術(shù)、頻率選擇表面(FSS)技術(shù)和陣列技術(shù),提升了太赫茲天線的性能。 3.新型THz天線設(shè)計 采用基于FDTD算法的電磁設(shè)計軟件優(yōu)化天線結(jié)構(gòu),設(shè)計出幾款新型的太赫茲天線,可以滿足人工視覺修復(fù)系統(tǒng)對于天線小型化、輕量化、高效率的要求。 為實現(xiàn)對傳統(tǒng)金屬波導(dǎo)開槽天線的輕量化改進我們設(shè)計出介質(zhì)集成波導(dǎo)開槽天線,中心工作頻率位于88.4GHz,-10dB通帶寬度為16.4GHz,最大定向性為13dBi。同時由于波導(dǎo)部分的介質(zhì)對于電磁波傳輸損耗較小,天線的整體輻射效率比金屬波導(dǎo)天線有所提升。 利用貼片型頻率選擇陣列的帶阻特性設(shè)計了頻率選擇表面結(jié)構(gòu)反射面天線,在拋物面反射增強單側(cè)輻射強度聚合波束的基礎(chǔ)上有選擇的透射電磁波,使得天線的輻射效率提升,天線的反射系數(shù)也得到一定程度改善。我們設(shè)計了中心工作頻率為101GHz,-10dB通帶寬度為6GHz,反射系數(shù)深達(dá)-50dB的太赫茲天線。 利用靠近開口處短路板的設(shè)計思想我們設(shè)計了波導(dǎo)寬邊饋電角錐喇叭天線,在增強天線的輻射效率的基礎(chǔ)上縮減了天線的整體尺寸。其工作頻率為88.5GHz,-10dB通帶寬度為17.9GHz,相對帶寬高達(dá)20.2%,最大定向性為16.5dBi。 采用可與人體共生的生物陶瓷為基底,其上覆蓋仿生鈦合金蝶形結(jié)構(gòu),設(shè)計了可植入眼底陶瓷貼片蝴蝶形天線,工作于0.224THz,-10dB帶寬為11.6GHz,最大定向性為11.8dBi。 4.加工測試兩款天線 基于以上幾款天線的設(shè)計和國內(nèi)加工及測試條件,利用微機械精密加工技術(shù)實現(xiàn)了波導(dǎo)開槽天線和波導(dǎo)寬邊饋電角錐喇叭天線的制作,使用矢量網(wǎng)絡(luò)分析儀測試了天線的反射系數(shù),并與仿真測試結(jié)果做了橫向比對,仿真和測試結(jié)果具有一定吻合度。 本論文為把太赫茲天線技術(shù)結(jié)合至人工視覺修復(fù)系統(tǒng)提供了參考依據(jù),對未來太赫茲天線技術(shù)的實際應(yīng)用具有重要的指導(dǎo)意義。
[Abstract]:In the scientific development brings great convenience to the human visual disability in twenty-first Century, and the blind due to visual impairment, not through the visual perception of the world to fully enjoy the wonderfull life, visual disorders brought about family not only the hardships of life is the pain of the soul. The rapid development of advanced terahertz antenna technology is applied to the development of artificial vision repair system, for the blind regain sight brings new hope, has great social value and wide application prospect. In order to better achieve the THz antenna technology combined with artificial vision system, the main contents are as follows:
The theoretical study of 1. artificial vision repair system
This paper investigates the technology and application of artificial vision repair at home and abroad, studies the structure, type division and key technologies of the artificial vision repair system, and applies THz antenna technology to the front end of the vision signal extraction system of the artificial vision system, which improves the system performance.
2. terahertz antenna theory
Through the learning of basic antenna theory, we know the practical significance of antenna parameters. In the design process of terahertz antenna, reflector technology, frequency selective surface (FSS) technology and array technology are adopted to enhance the performance of terahertz antenna.
3. new THz antenna design
The electromagnetic design software based on the FDTD algorithm is used to optimize the antenna structure, and several new terahertz antennas are designed, which can meet the requirements of the miniaturization, lightening and high efficiency of the artificial vision repair system.
In order to realize the improvement of our design of substrate integrated waveguide slot antenna to the traditional lightweight metal waveguide slot antenna, the center frequency at 88.4GHz -10dB band width is 16.4GHz, the maximum is 13dBi. at the same time as the directional waveguide medium for electromagnetic wave transmission loss is small, the radiation efficiency of the antenna has improved than metal waveguide antenna.
Stopband frequency selection array using the patch type design of frequency selective surface antenna reflecting surface structure, enhance the radiation intensity of the unilateral polymerization beam selective transmission of electromagnetic wave in the parabolic reflector, the antenna radiation efficiency improvement, reflection coefficient of the antenna is also improved to a certain extent. We design the center frequency of 101GHz -10dB, pass band width is 6GHz, depth of -50dB THz antenna reflection coefficient.
The design thought of opening near the short circuit board we designed waveguide feed horn antenna, based on enhancing the radiation efficiency of the antenna on the reduction of the overall size of the antenna. Its working frequency is 88.5GHz, -10dB bandwidth is 17.9GHz, the relative bandwidth of up to 20.2%, the maximum directivity is 16.5dBi.
The bioceramic, which can coexist with human body, is covered with bionic titanium alloy butterfly structure. A butterfly shaped antenna with implanting ceramic patch is designed. It works at 0.224THz, -10dB bandwidth is 11.6GHz, and the maximum orientation is 11.8dBi..
4. processing test two antenna
The above several antenna design and domestic processing and testing based on the condition, makes the waveguide slot antenna and waveguide feed horn antenna with micro machining technology, the reflection coefficient of the antenna test using vector network analyzer, and the horizontal comparison and simulation test, simulation and test results has a certain degree of agreement.
This paper provides a reference for the combination of THz antenna technology and artificial vision repair system, and has important guiding significance for the future application of terahertz antenna technology.

【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：R318

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本文編號：1427814