Wang, Yi, Ke, Maolong, Lancaster, M.J. and Huang, F.
(2009)
Micromachined millimeter-wave rectangular-coaxial branch-line coupler with enhanced bandwidth.
IEEE Transactions on Microwave Theory and Techniques, 57 (7).
pp. 1655-1660.
ISSN 0018-9480
(doi:10.1109/TMTT.2009.2021872)