I. Ohta, K. Toda, M. Kishihara, and T. Kawai, “Design of cruciform substrate-integrated waveguide hybrids based on H-plane planar circuit approach,” 2007 Asia-Pacific Microwave Conf. Proc., pp.683-686, Dec.2007.
I. Ohta and M. Kishihara, “Comment on “Supercompact substrate integrated waveguide cruciform directional coupler”,” IEEE Microw. Wireless Compon. Lett., vol. 18, no.5, May. 2008.(in press) [DOI: 10.1109/LMWC.2008.922137]