本文主要介绍基于毫米波向上扩展方式的THz测试技术,主要包括THz信号发生、THz信号功率和频谱检测及矢量网络分析等相关仪器的实现方案和目前国内外达到的主要技术指标.

The effect of the microstrip bend on the propagation characteristics of a microstrip line was investigated based on the Finite-Difference Time-Domain（FDTD）method.The dispersive characteristics of a microstrip line with a bend are quite different from that of a uniform straight microstrip line.The effect of bend discontinuity on propagation constants deceases exponentially with the distance form the corner of the bend.This can be explained by the fact that the higher order modes excited by the bend discontinuities have intrinsic properties of exponentially decay with the distance from the bend discontinuities.This effect can be negligible（less than five percent）when the distance is beyond ten times of conductor strip width.The S parameters and propagation constants comparison between unmitered and mitered bends are also presented.The proposed method which takes advantage of the FDTD algorithm and the Root Mean Square Deviation（RMSD）analysis is also an effective way for analyzing the dispersion characteristics of other planar transmission lines.

Based on the analysis of attenna gain and the transport characteristics of electrons in quasi 1-D quantum wires,an idea for constructing a new type of nano antennas with quasi 1-D quantum wires was proposed.An experimental prototype consisting of carbon nanotube has been set up to demonstrate the idea.Experimental results show that the electromagnetic radiation efficiency and bandwidth of the proposed antenna prototype are prior to traditional microstrip antennas.