Abstract
This paper presents a novel circuit structure of a compact tunable dual-band bandstop filter (DBBSF). This design combines two controllable traditional approaches in one filter: spurline section and stepped impedance resonator at 2.4 GHz and 3.5 GHz respectively. This filter was loaded with p-n junction varactors and tunable barium strontium titanate (Ba 0.7 Sr 0.3 TiO 3 , BST) ferroelectric capacitor to tune their frequency response. The center frequency of the first stop band can be tuned from 2.1GHz to 2.4 GHz by loading a varactor diode on the spurline section. By loading the stepped impedance resonator (SIR) with a similar varactor, the center frequency of the second stopband can be tuned from 3.5 GHz to 4.48 GHz. The center frequency of the first band can be tuned from 1.9 GHz to 1.99 GHz by loading the ferroelectric capacitor to spurline section by applying a DC control voltage from 0 V to 6 V. By embedding the stepped impedance resonator with a similar ferroelectric capacitor, the center frequency of the second band can be tuned from 3.3 GHz to 3.54 GHz with a DC control voltage from 0 V to 6 V.
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