太赫兹波滤波器与极化偏转器的基础研究

发布时间：2018-04-16 08:06

本文选题：太赫兹 + 滤波器　；参考：《电子科技大学》2015年硕士论文

【摘要】：太赫兹波(Terahertz,THz)是一种波长在0.03mm-3mm、频率在0.1-10THz之间的电磁波,频率范围介于微波和红外光波之间。随着THz波源技术与探测技术的快速发展,THz通信技术也得到了极大的发展,THz功能器件的性能也必须相匹配。本文设计了三种THz功能器件并测试其性能。本文主要研究内容如下:1、提出了一种聚酰亚胺(PI)柔性材料作为衬底的超材料滤波器,使用CST MWS软件进行仿真,在0~1.5THz频段共有两个通带,中心频率分别为0.53THz和1.23THz,透射率分别为0.88和0.97,带宽分别为30%,50%,与硅衬底相比,带宽与透射率都大大增加,但是频点会相应的右移,并且随着PI衬底厚度的增加,三个中心频率向左移动。本文详细的探索了器件的制备工艺,最终采用光刻工艺制备了尺寸误差均在合理范围内的器件,采用THz-TDS系统对结构进行透射测试,测得硅衬底滤波器经具有2个通带,中心频率分别为320GHz和1150GHz,透射率分别为0.5和0.6,带宽分别为30%和50%;PI衬底滤波器具有两个通带,中心频率分别为450GHz和1175GHz,透射率分别为0.4和0.95,与硅衬底结构相比,频率分别右移了130GHz和20GHz,并且透射率有明显的改善,与仿真结果基本相符。2、提出一种基于开口谐振环结构(SRR)的双开口谐振单元组成的滤波器,使用CST MWS软件进行仿真,设计了滤波器的结构。加工的成品经测试,在0.33 THz出现一个高通谐振峰,透过率达到0.9,3 dB带宽为72%;另一个高通谐振峰在1.12 THz,透过率达到0.86,3 dB带宽为48%。3、锶铁氧体极化偏转性质的探索:以五种不同的烧结温度制备了锶铁氧体,采用THz-TDS测试系统对样品进行THz波透射测试,表明THz波透射率会随着烧结温度的增加而降低。另外,本文搭建了THz无线收发系统,并测试了样品在该系统下的透射率及极化偏转角,材料的极化偏转角随烧结温度的增加有缓慢增加的趋势。
[Abstract]:Terahertz (THz) is a kind of electromagnetic wave with a wavelength of 0.03mm-3mm and a frequency between 0.1-10THz and the frequency range between microwave and infrared light.With the rapid development of THz wave source technology and detection technology, THz communication technology has been greatly developed and the performance of THz functional devices must be matched.In this paper, three kinds of THz functional devices are designed and tested.The main contents of this paper are as follows: 1. A kind of supermaterial filter with polyimide (Pi) flexible material as substrate is proposed, which is simulated by CST MWS software. There are two passbands in the 0~1.5THz band.The center frequencies are 0.53THz and 1.23 THZ, the transmittance is 0.88 and 0.97, and the bandwidth is 30 and 50, respectively. Compared with silicon substrate, the bandwidth and transmittance increase greatly, but the frequency points shift to the right, and the thickness of Pi substrate increases.Three center frequencies move to the left.In this paper, the fabrication process of the device is explored in detail. Finally, the device with reasonable size error is fabricated by photolithography. The transmission test of the structure is carried out by using THz-TDS system, and the silicon substrate filter has two pass bands.The center frequency is 320GHz and 1150 GHz, the transmittance is 0.5 and 0.6, the bandwidth is 30% and 50% respectively, the center frequency is 450GHz and 1175 GHz, and the transmittance is 0.4 and 0.95 respectively.The frequencies are shifted to the right of 130GHz and 20GHz, respectively, and the transmissivity is obviously improved, which is basically in accordance with the simulation results. A filter composed of double open resonant units based on the open resonant ring structure is proposed and simulated by CST MWS software.The structure of filter is designed.The finished product was tested and a high pass resonance peak appeared at 0. 33 THz.Another high pass resonance peak is 1.12 THZ, and the transmittance of 0.86 ~ 3 dB bandwidth is 48.3. the polarization deflection property of strontium ferrite is investigated. Strontium ferrite was prepared at five different sintering temperatures.The THz wave transmittance of the samples was measured by THz-TDS system. The results show that the transmittance of THz wave decreases with the increase of sintering temperature.In addition, the THz wireless transceiver system is built, and the transmittance and polarization deflection angle of the sample under the system are tested. The polarization deflection angle of the material increases slowly with the increase of sintering temperature.
【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】：TN713

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