Photonic band gap guiding of THz signal propagating in planar photonic crystal waveguide with bend angles of 30°, 60° and 90° - Joyas, Annie Lorraine B.; Parinas, Margie T.; Abad, Eugelyn C.; De los Reyes, Glenda B. (Proceedings of the Samahang Pisika ng Pilipinas, 2008)