Improvements in group delay characteristics based on the w-analysis of electro-magnetic waves and semianductonr devices

射频器件群时延色散的抑制是实现超宽带无线电系统的重要问题之一。为此，作为第一步，麦克斯韦方程和半导体器件方程之间的联合模拟技术已经开发的FDTD方法的基础上。使用该方法，一个60 GHz的放大器模块组成的PDTL（平面介质传输线）波导和HEMT器件已被共同模拟作为第一次尝试，其中的晶体结构的化合物半导体材料和毫米波波导的同时分析。该模块的仿真结果与实测结果吻合较好。该方法已成功地应用于InGaP/GaAsHBT和A1 GaN/GaNHEMT长指结构的微波特性分析。第二步，从电路技术的角度，包括集总元件电路和分布式电路，研究了群延迟产生的根源。第二步，成功实现了低群时延色散的全分布式电路开关MMIC，并实现了一种基于复合左右频带概念的新型群时延补偿电路拓扑。实现了最小尺寸的宽带平面自互补天线。最后，设计、制作并测试了InGaP/GaAs HBT有源巴伦超宽带放大器和群延迟补偿MMIC。实验结果表明，该方法成功地抑制了放大器的群时延。该MMIC可用作UWB自互补天线的驱动放大器。

Suppression of the group delay dispersions for RF components is one of the most important issues for realizations of UWB (Ultra Wide Band) radio system. For that purpose, as the first step, a co-simulation technique between the Maxwell's equations and the semiconductor device equations has been developed based on the FDTD method. Using the method, a 60 GHz amplifier module consisting of PDTL(Planar Dielectric Transmission line) waveguides and a HEMT device has been co-simulated as the first trial, where crystal structures for the compound semiconductor material and the millimeter-wave waveguides were simultaneously analyzed. Simulated results and measured results for the module were in good agreements. Thus the method has been successfully applied to the microwave characteristics analysis of long finger structures for InGaP/GaAs HBT's and A1GaN/GaN HEMT's. As the second step, the group delay generation origin was investigated in a viewpoint of the circuit technology, including both lumped element circuits and distributed circuits. The second step delivered a successful realization of fully distributed circuit switch MMIC with low group delay dispersion& Also a novel group delay compensation circuit topology based on the composite right hand/left band concept was realized. Also the minimum sized broadband planar self-complementary antenna was realized. As the final step, both an InGaP/GaAs HBT ultrabroad band amplifier with an active balun and a group delay compensation MMIC were designed, fabricated and tested. It has been demonstrated that the amplifier group delay was successfully suppressed. The MMIC can be used as a driver amplifier far UWB self-complementary antennas.