Metamaterials, which exhibit simultaneous negative permittivity and permeability, offer many intriguing possibilities for high-frequency circuits such as filters. Through the use of such left-handed materials (LHMs) as they are known and subwavelength split-ring resonators (SRRs) and complementary split ring resonators (CSRRs), it may be possible to build compact microstrip bandstop filters for use at microwave frequencies...
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