Dual-band CPW Transparent Bandpass Filter for Wireless Communication

In this study, we present a new transparent flexible coplanar waveguide (CPW) bandpass filter using polyethylene terephthalate (PET) substrate while the simulation results permit to characterize the filter in terms of bandwidth, S-parameters, and current distribution. The resonator of the filter is implemented using a special compact square ring resonator patterned in the central conductor of a CPW transmission line. The impedance bandwidth of the proposed bandpass filter in the lower and higher frequency bands are 5.4% (10.3 to 10.87 GHz) and 11.2% (12.7 to 14.2 GHz) respectively, making this transparent filter suitable for dual-band X and Ku bands applications. Due to its foldable, bendable and transparent qualities, this filter can easily be integrated together with an OLED light source.