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A short wavelength CCTL (comb-type capacitive transmission line) structure on MMIC has been developed for application to miniaturised on-chip passive components. Of all transmission line structures that have been reported to date, the CCTL structure shows the shortest guided wavelength. Using the CCTL structure, a highly miniaturised impedance transformer has been fabricated on GaAs MMIC. The impedance transformer shows good RF performances in a broad band from S- to X-band, and its size is 0.042 mm , which is 0.95% of the size of the conventional transformer on MMIC.
Date of Publication: March 4 2010