Smart antennas using electro-active polymers for deformable parasitic elements

A novel concept for implementation of smart antennas is introduced. Deformable smart materials, as parasitic elements to alter the antenna pattern, are demonstrated. Such a reconfiguration can be used for improved spectral efficiency through diversity-type techniques. The approach effectively allows replacement of much RF circuitry and the signal processing modules present in a conventional array, by simple, low-cost, low power, smart materials. A basic, proof-of-concept prototype comprising a radiating monopole and a deformable conductive strip made of ionic polymeric–metal composite is presented. The deformable conductive strip has a voltage-controlled slant angle and its close proximity to the monopole reconfigures the pattern. Physical measurements verify the operation of the antenna. The impedance matching is also discussed.