A Gain Equalizer Based on Grounded Coplanar Waveguide with Sprial-Shaped Defected Ground

A microwave gain equalizer has been proposed and analyzed. The equalizer is based on grounded coplanar waveguide (GCPW) with periodic spiral-shaped defected ground structure (DGS), which has a maximum attenuation of 8.5 dB from 6 to 8 GHz. The final size of the equalizer is 9.5mm×3.2mm×0.254mm. The insertion loss of the equalizer is 0.46 dB, and its return loss is better than 11 dB.