Publication: IEICE TRANSACTIONS on Electronics Publication Date: 2005/07/01 Vol. E88-CNo. 7pp. 1387-1394 Type of Manuscript: Special Section PAPER (Special Section on Recent Technologies of Microwave and Millimeter-Wave Devices Focusing on Miniaturization and Advancement in Performance with Their Applications) Category: Passive Circuits Keyword: short-slot coupler,
length reduction,
Butler matrix,
post-wall waveguide,
dielectric substrate,
rectangular hole,
