Year: 2018
Type: article
Abstract: A varactor-based tunable bandstop filter has been proposed in this letter. The proposed filter is based on a dual-mode circuit developed by introducing inductive and capacitive couplings into a notch filter. The frequency tunability is achieved by using varactor diodes instead of the lumped capacitors in the circuit. Next, the equivalent circuit model has been implemented in planar microstrip technology using thin inductive traces and varactor diodes. The fabricated filter prototype shows a continuous center frequency tuning range of 0.66-0.99 GHz with a compact size of 0.12λg× 0.16λg, where λgis the guided wavelength at the middle frequency of the tuning range.
Authors: Amir Ebrahimi, Thomas Baum, James Scott, Kamran Ghorbani
Institution: RMIT University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2801253182