Prof. Chung-Tse Michael Wu（National Taiwan University）

Metamaterials (MTMs) are synthetic electromagnetic materials possessing unique properties 
not found in natural materials. Their introduction has spurred the creation of innovative circuits with enhanced components.
One notable metamaterial-based design is the composite right/left-handed transmission line (CRLH-TL) leaky-wave antennas (LWAs). 
These antennas offer continuous frequency-dependent beam scanning from backfire to endfire with a true broadside beam. 
They also ensure excellent impedance matching throughout their operational range, using a straightforward feeding mechanism. 
The CRLH LWAs’ ability to map frequency to space means unknown target locations can simply be pinpointed by analyzing 
the spectral components of the returning wave. This paves the way for real-time detection, with data acquisition speeds 
mainly determined by the signal source’s frequency sweep rate. The sensor’s field-of-view is also expanded thanks to 
the wide scanning angle of CRLH LWAs. Such features enable applications like swift 2-D beamforming, expansive real-time remote sensing, 
vital sign monitoring, motion detection, and microwave imaging. Additionally, applying spatiotemporal modulation to 
CRLH LWAs can generate harmonic waves and enhance physical layer security, promoting safer wireless communication.