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A filter which its bandpass frequency can be reconfigured is presented. Its central frequency ranges from 316 MHz to 392 MHz (22% tuning). The filter is based on a miniaturized compose right/left-handed ring resonator. The reconfiguration of its resonant frequency is implemented by shifting a short location, thus changing its effective lefthanded inductance. This is opposed to the conventional capacitance change of other reconfigurable filters. The relation short location versus central frequency is quasi-linear. The short location could be controlled by a servomotor configuration.
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Jose R. Reyes-Ayona, Evelyn L. Vargas-López, Tejinder K. Kataria , Daniel Jáuregui-Vázquez, Roberto Rojas-Laguna, "Reconfigurable passband filter using a controllable variable inductance ," Proc. SPIE 10719, Metamaterials, Metadevices, and Metasystems 2018, 107190F (19 September 2018); https://doi.org/10.1117/12.2321697