Adaptive RF and mmwave Technology
Modern wireless communications and radar systems are miniatured in size, and they are required to operate at multiple-frequency bands in order to provide the enhanced and multifunctional performances. Frequency-agile and multifunctional circuits are highly desirable in communications systems, radars, sensor networks, and biomedical devices. Tunable elements are the key components in these frequency-agile and multifunctional systems. Our research provides tunable slow wave transmission line elements with both inductance and capacitance tunability enabled by nanoscale thin films with unique electrical properties for the first time. The proposed transmission line elements can be used for the design of arbitrary multi-band devices. Our research covers design optimization of slow wave transmission lines elements, broadband characterization of magnetization dynamics of submicron size patterned ferromagnetic material (Permalloy, Py), integration of BST/PZT and Py Nano thin films enabled slow wave elements with the goal of implementing low-loss, high efficient, multi-function, cost effective, frequency agile RF devices. Frequency reconfigurable multiband RF components such as couplers, filters and phased array antennas are developed and characterized. The main objective of this research is to provide compact multi-band RF passives design with reduced size, wide continuous frequency tuning, high linearity, and low signal loss.