A compact microstrip lowpass filter using aU-shaped defected ground structure (DGS) [1] with compensated microstrip is proposed [2] in the paper. The equivalent circuit for the proposed U-shaped DGS and its corresponding L-C paremeters are extracted by using its Sparameters response and a simple circuit analysis method. The lowpass filter using three cascaded U-S DGS provides a compact size, very good transition sharpness with low insertion loss in passband and wide rejection in the stopband. Measured results show good agreement with the theoretical results.
A new technique for reducing the size, and improving the rejection in the stopband of a low-pass filters using modified DGSs is proposed . An equivalent circuit model is used to investigate the DGS characteristics. It will be demonstrated that the filter can provide a sharp transition and a wide rejection in the stop-band. To further verify the new technique, a filter using the deformed DGSs has been fabricated and measured. The agreement between the simulated and measured results confirms the effectiveness of the proposed concepts.
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