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This paper presents a miniature-size band-reject filter on a Coplanar Waveguide (CPW) transmission line using series connected complementary split ring resonators (CSRRs) and series capacitive gaps for X-band applications. The band-reject filter has highly miniaturized dimensions and is capable of solving almost all the basic limitations to which the conventional band-reject filters are mostly susceptible. The series connected CSRRs are etched on the signal planes of the CPW transmission line on silicon substrate enabling CMOS compatibility with planar IC technology. It is a concept resulting in higher bandwidth, low insertion loss of 0.5 dB with high rejection of 40 dB in the stop bands better than similar designs. The optimized design of the proposed device is performed using the parametric study of filter characteristics. The proposed devices RF analysis and circuit model are simulated using Ansoft High-Frequency Structural Simulator (HFSS) v13® and Agilent Advanced Design System (ADS) 2009. Measured results are in good agreement with their simulated counterparts and the measured performance is encouraging in all respects. [ABSTRACT FROM AUTHOR]

The design of a metamaterial-based tunable band elimination filter is described on silicon coplanar wave- guide (CPW) using complementary split ring resonators (CSRRs) and radio frequency microelectromechanical systems (MEMS) varactors to ensure compatibility with integrated circuit fabrication technology. CSRRs are patterned on both the active signal line and ground on both sides. A cantilever bridge is suspended on the signal line to realize variable capacitance. The rejection band of the filter is tuned by moving the MEMS bridge up or down using electrostatic actuation. A stopband around the center frequency of 35.32 GHz with a rejection ratio of $\sim 20.19$ dB is obtained when the bridge is pulled down. Another stopband around the center frequency 38.80 GHz is observed with a rejection ratio of $\sim 18.29$ dB when the bridge is allowed to remain in its up state without electrostatic actuation. Simulation for RF behavior is performed using ANSOFT High Frequency Structural Simulator v13. Numerical extraction of the filter parameters has been done using Agilent ADS (2009) and COVENTORWARE (2010) for mechanical and electromechanical characterization. This is the first reported tunable CPW filter having CSRR on the signal line and ground plane on silicon substrate using MEMS technology. [2014-0365] [ABSTRACT FROM PUBLISHER]