Fractal defected ground microstrips

Microstrips with the ground plane perturbed by a sequence of slots appropriately spaced to reproduce a Cantor fractal scheme exhibit spectral responses characterized by several transmission bands. The parameters of these bands (center frequency, bandwidth, minimum insertion loss) have been calculated for a fixed fractal scheme by varying both the substrate permittivity and the width of the slots. Data show that microstrips with the highest substrate permittivity have a lower number of transmission bands and lower insertion loss values.