研究目的
Investigating the design and performance of a high impedance surface capable of analogue phase shifting in the millimetre wave band using piezoelectric actuators with enhanced displacement.
研究成果
The proposed piezoelectric-actuated phase shifters offer significant advantages over competing technologies, including low losses and acceptable switching speeds in the millimetre wave band. The patch unit cell outperforms the loop unit cell in terms of bandwidth, losses, and frequency range, making it a promising solution for future millimetre wave structures.
研究不足
The study is based on simulations and the practical realization of the design may face challenges related to the integration of piezoelectric actuators and the precise control of ground plane separation.
1：Experimental Design and Method Selection:
The study involves the simulation and design of a high impedance surface (HIS) for phase shifting in the millimetre wave band, utilizing piezoelectric actuators for tuning. The methodology includes the use of commercial 3D EM simulation software (CST Microwave Studio) for modeling and simulation.
2：Sample Selection and Data Sources:
The study focuses on two types of unit cells: a loop unit cell and a patch unit cell, designed on a 0.8 mm TLY-5 dielectric substrate.
3：8 mm TLY-5 dielectric substrate.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Piezoelectric actuators (Physik InstrumenteTM), TLY-5 dielectric substrate, and commercial 3D EM simulation software (CST Microwave Studio).
4：Experimental Procedures and Operational Workflow:
The unit cells were modeled with periodic boundary conditions and normal incidence, simulating the effects of varying the ground plane separation to achieve phase shifting.
5：Data Analysis Methods:
The performance of the unit cells was analyzed based on phase spectra, reflection magnitude, bandwidth, and losses.
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