IEEE Microwave and Wireless Components Letters · 2013 · 23 citations · 5 references
EngineeringElectrical EngineeringAntennasMicrowave EngineeringPort EngineeringMicrowave FiltersMicrowave Integrated CircuitsMicrowave MaterialsMicrowave ResonatorsMicrowave Semiconductor DevicesMicrowave Transmission LinesCoplanar Waveguide FiltersCoplanar WaveguidesInsertion LossMicrowave Filter DesignMicrowave Resonator DesignTunable FiltersTunable Microwave CircuitsTunable Resonators
A coplanar waveguide lowpass filter (CPW-LPF) with high bandwidth tunability and broadband rejection is demonstrated. Compared to the reported design approaches, a relatively straightforward design with varactor-tuned microwave resonators is proposed for the realization of the tunable CPW-LPF. It is shown that the presented tunable CPW-LPF has a wide bandwidth tuning range via a small bias swing, low passband insertion loss, as well as wideband rejection. Also, the filter roll-off remains unchanged while the cut-off frequency is varied. The proposed tunable CPW-LPF is experimentally verified and expected to find applications in modern communication systems.
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