应用于太赫兹放大器的光栅—孔阵列高频结构研究
发布时间：2019-05-17 01:09
【摘要】：太赫兹科学技术无论在基础理论研究方面还是在实际应用领域,都取得了巨大的进步和发展。但是,目前制约太赫兹技术走向实际应用的瓶颈为小型化的高功率太赫兹辐射源,因此采用真空电子学放大器将功率水平提高到瓦级是推动太赫兹技术实现应用的有效途径。本文提出采用开敞的光栅-孔阵列高频结构以改善真空电子辐射源的性能,以此为例设计了工作频率0.14THz的放大器。具体工作如下:首先,研究了开敞的光栅-孔阵列周期慢波结构的高频特性。通过HFSS仿真得到了需要的模式及其场分布;研究了横向侧壁、耦合孔对场特性的影响;研究了结构参数对色散特性和耦合阻抗的影响;研究了光栅-孔阵列结构中电磁波的传输特性。其次,对太赫兹放大器进行了粒子模拟研究。采用粒子模拟方法研究了光栅-孔阵列结构中的注波互作用过程,分析了工作参数对器件输出性能的影响。最终,获得了工作频率142.4GHz、耦合输出功率67.2W、增益28dB、高频结构中注波互作用换能效率大于10%的太赫兹放大器。研究结果表明,利用孔阵列结构增强光栅表面电场强度及耦合阻抗的特性,将有效提高器件的效率和单位长度的增益;带有底板及横向侧壁的光栅-孔阵列结构作为太赫兹放大器高频系统利于对信号进行馈入与提取,同时底板与横向侧壁的存在能够减少电磁波能量的外泄。
[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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN722
本文编号：2478688
[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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN722
【参考文献】
相关期刊论文 前1条
1 王泰春,杨震华,田世洪,董志伟;WAGFEL和FBC程序计算方波导自由电子激光放大器结果的对比分析[J];计算物理;1990年01期
，本文编号：2478688
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