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Abstract
An electronically reconfigurable notch filter for cognitive radios application is presented. By loading the stub-loaded resonator along the transmission line, two notched bands are created. Central frequency tuning of one notched band is realized by using the silicon varactor diodes, while the other notched band remains almost unchanged during tuning. Bias Ts and the resistors having high resistance value are adopted to function as DC paths for the varactors. A tuning range of 1.92–2.92 GHz for the one notched band with average insertion loss 2.4 dB across the passband (0.1–5 GHz) is achieved, and the other notched band is used to suppress the WiMAX signal (3.3– 3.8 GHz). The highest rejection level of the tunable notched band is 21.5 dB, while the static notched band shows rejection of more than 30 dB at 3.66 GHz.
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