Publication: IEICE TRANSACTIONS on Electronics Publication Date: 2008/07/01 Vol. E91-CNo. 7pp. 1098-1103 Type of Manuscript: Special Section PAPER (Special Section on Heterostructure Microelectronics with TWHM 2007) Category: GaAs- and InP-Based Devices Keyword: Gunn VCO, flip-chip, millimeter-wave, tuning-frequency range, laser micromachining,