L-shaped defected ground structure for coplanar waveguide

An L-shaped defected ground structure (DGS) for a coplanar waveguide (CPW) is proposed. The L-section can be repeated in series at one side or at both sides to prolong the current path and thus to increase the effective inductance and capacitance of the structure. The equivalent capacitance and inductance of the proposed structure vary linearly relative to the number of added L-sections. The center frequency varies from 8.38 GHz for single-sided one L-section (SS1S) down to 4.21 GHz for double-sided four L-sections (DS4S) with more thin 23 dB rejection in the stopband. Measured, EM simulated, and circuit simulated performances are in a very good agreement.