Future Works

First, further work will definitely be eliminating unwanted radiation source. If we want to study the polarization concept, the better way is to study only one set of thickness shear wave. Hence, instead of using branch-line coupler, we should firstly feed the antenna directly by connecting the electrodes. Second, if we can know what exactly is the resonant frequency of the device, the magnetostrictive properties need to be combined together in the simulation. But it’s often time-consuming to do the full coupling simulation, sometimes 2 to 3 days for simple cases only for decoupled simulation. Hence, if we want to develop and optimize such device, there’s a lot of room for improvement of simulation. Also, the meshing mechanism require improvement for the balance between time and accuracy. What is the best trade-off strategies for the meshing?

Last but not the least, the study on material of magnetostrictive properties requires further clarification. How good is the radiation characteristics of Ni? Is it the most suitable material for GHz band application? What’s the frequency response of Ni? Is it suitable for high or low frequency band? Why is the team from Northeastern University use GaFeB instead of Ni? What is the radiation efficiency calculation by using piezoelectric and magnetostrictive material? Since the efficiency is the most important question of electrically small antenna, this problem needs to be defined and studies clearly in the future.

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