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Tae-Soon Yun, Hyun-Suk Kim, Ki-Byoung Kim, Il-Doo Kim, Ho-Gi Kim, and Jong-Chul Lee, “New Tunable Microwave BST/MgO Phase Shifters Using Interdigital Capacitors and Slit-Inductors”, Japanese Journal of Applied Physics, vol. 46, 5245-5248 (2007).,