... 97 8- 1 -4 24 4- 2 00 4- 9 ; ISSN 1 54 5-8 27X, Sinaia, Romania, October 2008. Tippet J. C., Speciale R. A. (1982). A rigorous technique for measuring the scattering matrix of a multiport device with a 2-port ... supported microwave zeroth-order resonance antenna on metamaterial approach, Proceedings of the 2007 Asia-Pacific Microwave Conference, APMC 2007, pp.221–2 24, ISBN 1 -4 24 4- 0 74 8-6 , Bangkok, Thailanda, ... though the photo-sensitivity of 4H-SiC based IMPATT is higher than its GaN counterpart, the overall Terahertz performance of un-illuminated GaN IMPATT is far better than that of a 4H-SiC based...