【摘要】：太赫茲科學(xué)技術(shù)無論在基礎(chǔ)理論研究方面還是在實(shí)際應(yīng)用領(lǐng)域,都取得了巨大的進(jìn)步和發(fā)展。但是,目前制約太赫茲技術(shù)走向?qū)嶋H應(yīng)用的瓶頸為小型化的高功率太赫茲輻射源,因此采用真空電子學(xué)放大器將功率水平提高到瓦級是推動(dòng)太赫茲技術(shù)實(shí)現(xiàn)應(yīng)用的有效途徑。本文提出采用開敞的光柵-孔陣列高頻結(jié)構(gòu)以改善真空電子輻射源的性能,以此為例設(shè)計(jì)了工作頻率0.14THz的放大器。具體工作如下:首先,研究了開敞的光柵-孔陣列周期慢波結(jié)構(gòu)的高頻特性。通過HFSS仿真得到了需要的模式及其場分布;研究了橫向側(cè)壁、耦合孔對場特性的影響;研究了結(jié)構(gòu)參數(shù)對色散特性和耦合阻抗的影響;研究了光柵-孔陣列結(jié)構(gòu)中電磁波的傳輸特性。其次,對太赫茲放大器進(jìn)行了粒子模擬研究。采用粒子模擬方法研究了光柵-孔陣列結(jié)構(gòu)中的注波互作用過程,分析了工作參數(shù)對器件輸出性能的影響。最終,獲得了工作頻率142.4GHz、耦合輸出功率67.2W、增益28dB、高頻結(jié)構(gòu)中注波互作用換能效率大于10%的太赫茲放大器。研究結(jié)果表明,利用孔陣列結(jié)構(gòu)增強(qiáng)光柵表面電場強(qiáng)度及耦合阻抗的特性,將有效提高器件的效率和單位長度的增益;帶有底板及橫向側(cè)壁的光柵-孔陣列結(jié)構(gòu)作為太赫茲放大器高頻系統(tǒng)利于對信號進(jìn)行饋入與提取,同時(shí)底板與橫向側(cè)壁的存在能夠減少電磁波能量的外泄。
[Abstract]:Terahertz science and technology have made great progress and development both in basic theory research and practical application. However, at present, the bottleneck restricting the practical application of terahertz technology is the miniaturization of high power terahertz radiation source, so using vacuum electronic amplifier to increase the power level to watt level is an effective way to promote the application of terahertz technology. In this paper, an open grating-hole array high frequency structure is proposed to improve the performance of vacuum electron radiation source. Taking this as an example, an amplifier with operating frequency 0.14THz is designed. The specific work is as follows: firstly, the high frequency characteristics of open grating-hole array periodic slow wave structure are studied. The desired mode and field distribution are obtained by HFSS simulation, the effects of transverse side wall and coupling hole on the field characteristics are studied, and the effects of structural parameters on dispersion characteristics and coupling impedance are studied. The propagation characteristics of electromagnetic wave in grating-hole array structure are studied. Secondly, the particle simulation of terahertz amplifier is carried out. The beam-wave interaction process in grating-hole array structure is studied by particle simulation method, and the influence of working parameters on the output performance of the device is analyzed. Finally, a terahertz amplifier with operating frequency of 142.4GHz, coupling output power of 67.2W and gain of 28dB is obtained, and the energy transfer efficiency of beam-wave interaction is more than 10% in high frequency structure. The results show that the efficiency of the device and the gain per unit length can be effectively improved by using the hole array structure to enhance the electric field intensity and coupling impedance on the surface of the grating. As the high frequency system of terahertz amplifier, the grating hole array structure with bottom plate and transverse side wall can feed in and extract the signal. At the same time, the existence of bottom plate and transverse side wall can reduce the leakage of electromagnetic wave energy.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN722

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相關(guān)期刊論文 前1條

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本文編號：2478688