A 12–18-GHz Three-Pole RF MEMS Tunable Filter
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This paper presents a state-of-the-art RF microelectromechanical systems (MEMS) wide-band tunable filter designed for the 12-18-GHz frequency range. The coplanar-waveguide filter, fabricated on a glass substrate using loaded resonators with RF MEMS capacitive switches, results in a tuning range of 40% with very fine resolution, and return loss better than 10 dB for the whole tuning range. The relative bandwidth of the filter is 5.7 ± 0.4% over the tuning range and the size of the filter is 8 mm × 4 mm. The insertion loss is 5.5 and 8.2 dB at 17.8 and 12.2 GHz, respectively, for a 2-kΩ/sq bias line. The loss improves to 4.5 and 6.8 dB at 17.8 and 12.2 GHz, respectively, if the bias line resistance is increased to 20 kΩ/sq. The measured IIP3 level is >37 dBm for Δ f > 200 kHz. To our knowledge, this is the widest band planar tunable filter to date. © 2005 IEEE.
author list (cited authors)
Entesari, K., & Rebeiz, G. M.