Tunable Microwave Devices with Magnetoelectric Coupling
May 13, 2013
from 11:00 AM to 12:00 PM
|Where||Engr. IV Bldg., Tesla Room 53-125|
|Contact Name||Prof. Ethan Wang|
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PhD Candidate, Northeastern University
Modern ultra-wideband or multiband communication systems, radars, and metrology systems need reconfigurable subsystems, such as tunable bandpass filters, phase shifters that are compact, lightweight, and power-efficient. At the same time, isolators with a large bandwidth are widely used in communication systems for enhancing the isolation between the sensitive receiver and power transmitter. In the meantime, voltage controllable tunable devices are highly demanded due to their fast tuning and less power consuming. Multiferroic composite materials consisting both a magnetic phase and a ferroelectric phase are of great current interests, which offer the possibility of magnetoelectric (ME) coupling, and have led to many novel multiferroic devices. Partially magnetized ferrites may operate in a low permeability region less than unity. The magnetization tuning under modest magnetic field before saturation will lead to large fractional change of the permeability. This will result in large frequency or phase shift tuning in the microwave device. A combination of the partially magnetized ferrite and the magnetoelectric coupling concept may overcome the disadvantage of the requirement of large external magnetic biases that are needed in traditional voltage tunable microwave devices, and will lead to devices that are more compact and power efficient.
Xi Yang received the B.Sc. degree in electrical engineering from the Shanghai Jiao Tong University, Shanghai, China, in 2008, and the M.Sc. degree from Jilin University, Changchun, China, in 2010. He is currently working toward the Ph.D. degree at Northeastern University, Boston, MA. Since 2010, he has been working as a Research Assistant in Dr. Nian Sun’s group at Northeastern University, Boston, MA. His research interests include novel magnetic, ferroelectric, and multiferroic materials for microwave applications, different RF/microwave devices, and integrated tunable multiferroic electromagnetic subsystems.