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- W2167882299 abstract "State-of-the-art frequency-agile technologies such as semiconductors, micro-electro-mechanical systems (MEMS) and ferrites are briefly overviewed and compared with the emerging ferroelectric techniques such as Ba/sub x/Sr/sub 1-x/TiO/sub 3/ (BST) that are becoming an attractive candidate for designing low-cost and miniaturized tunable integrated microwave devices such as filters and phase shifters. Particularities of ferroelectric materials are summarized and difficulties in connection with the use of BST thin-films in RF monolithic circuit design are addressed. On the basis of a commercially available sol-gel process, BST thin-films have successfully been deposited on alumina substrate to fabricate metal-insulator-metal (MIM) tunable capacitors. Early results of such capacitors at the room temperature indicate that a tunable ratio (C/sub max//C/sub min/) as high as 3.5 can be obtained over 1-6 GHz with 20 biasing voltage (34 V//spl mu/m) even though the ohmic loss remains high. This research also shows a 7% weak effect of hysteresis." @default.
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- W2167882299 date "2005-08-16" @default.
- W2167882299 modified "2023-10-18" @default.
- W2167882299 title "Tunable Microwave Device: Status and Perspective" @default.
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- W2167882299 doi "https://doi.org/10.1109/newcas.2005.1496728" @default.
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