Loo, Pak Kwan was born in Selangor, Malaysia. He received the B.Eng. degree in Electronics System Engineering in 2004 from Sheffield Hallam University, and the M.Sc. in Electronics Engineering in 2005 from Queen’s University Belfast. He is currently working towards the Ph.D. degree at Heriot-Watt University, Edinburgh, U.K. His research interests include analysis and design of quasi-optical bandpass filter based frequency selective surfaces and circular polarization selective surfaces.