In this paper, a compact reconfigurable tri-band bandstop filter (BSF) with sharp-rejection and high selectivity is presented. The proposed filter is based on a 50\,Ohms microstrip feed line, six hexagonal metamaterial cells (HMCs) with different sizes and switches. The structure of the filter has seven different modes of operation characterized. A good agreement between the simulated and measured results is obtained. The results indicate that the proposed filter design, with overall size of 0.28λgx0.17λg, is a good candidate for multiservice radios applications.
"Design and Development of Compact Reconfigurable Tri-Stopband Bandstop Filter Using Hexagonal Metamaterial Cells for Wireless Applications," Progress In Electromagnetics Research M,
Vol. 80, 93-102, 2019. doi:10.2528/PIERM18102305
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