A differential 4-bit 6.5-10-GHz RF MEMS tunable filter

By Kamran Entesari, Gabriel M. Rebeiz. IEEE transactions on microwave theory and techniques, 2005

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Photonic signal processing of microwave signals (2006, background): “…and varactor MEMs enable continuous frequency tuning over a range of several percent and recently reported MEMs switches enable digital discrete frequency tuning in the 40% range [44], [45], photonic signal processing techniques enable tuning of octaves or even decades of continuous tuning range.”
Reconfigurable planar filters (2009, methodology): “The combline filtering structure has been widely used for the development of tunable or reconfigurable filters using different electronic control device technologies, including RF MEMS and ferroelectrics, though the bandwidth of this type of filter is usually small.”
A 12-18-GHz three-pole RF MEMS tunable filter (2005, background): “RF MEMS also offer outstanding linearity with a measured overall 40–50 dBm [2]–[4].”
Low-Loss Two-Pole Tunable Filters With Three Different Predefined Bandwidth Characteristics (2008, background): “Tunable filters have been studied for almost three decades and most of them can be classified in three categories: yttrium–iron–garnet (YIG) filters [1], varactor diode filters [2]–[5], and RF microelectromechanical systems (MEMS) filters [9]–[12].”