ott.ua.edu

1. UAIPD 15-0011
Dr. Yang-Ki Hong
GHz Magnetic Chip Inductor with High Magnetic
Loss

2. Current Problems
• Surface-mounted devices (SMD) type inductors
– Magnetic core inductors
• Limited to low frequencies (<100 megahertz)
– Non-magnetic ceramic core
• Small inductance density
• Low self-resonant frequency (SRF) : when a “short” occurs
• Parasitic capacitance: unwanted capacitance
• Magnetic loss of core material is a barrier to the
development of GHz magnetic chip inductors

3. • GHz magnetic chip inductor
– Air and magnetic-core materials
• Center magnetic bar
– Surrounded by coils, top/bottom magnetic slabs, and an air-core
inside the enclosed magnetic wall
• Location of air-core between the magnetic core and inductor
coil
– Key parameter for high performance GHz magnetic chip inductor
Technology

4. • Realized simultaneously high L, Q factor and SFR
– Due to negligible core loss
• Increase in inductance
– Due to the magnetic core possessing a high magnetic
permeability
• Outperforms conventional air- and magnetic-core
inductors
– Combination of both air- and magnetic-core materials
Advantages

5. • Dr. Yang-Ki Hong
– E.A. Larry Drummond Endowed
Chair of Computer Engineering
– Professor of Material Sciences Ph. D.
Program
– More than 100 referred journal papers
– 13 patents awarded
– 8 provisional US patents
• Departments
– Center for Materials for Information
Technologies
– Electrical and Computer Engineering
Inventor
ykhong@eng.ua.edu

6. Office for Technology Transfer
720 2nd Ct E
Tuscaloosa, AL 35401
UAIPD 15-0011
OTT@UA.edu
www.OTT.UA.edu