No abstract

In this article, a novel frequency switchable method for Ultra‐Wide‐Band (UWB) microstrip antenna with dual notches is presented and discussed. This method is based on hexagonal‐shaped Split Ring Resonator (SRR) metamaterial cells located close to the 50‐Ω feed line and ideal switches inserted at the inner and the outer SRR of each cell. The incorporation of these ideal switches helps in changing the location of the opening of the inner ring (inner ring fictive rotation) and in activating or deactivating the filtering introduced by the metamaterial cells. The resulting radiating structure has an impedance bandwidth extending from 2.8 GHz to more than 11GHz accompanied with dual notched bands characteristic. It offers several cases by opening or closing the ideal switches. The obtained simulation results agree well with measurements carried out on the fabricated prototypes.

No abstract

No abstract

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 0.28λg × 0.17λg, is a good candidate for multiservice radios applications.