Small Microstrip Low-Pass Filter by using Novel Defected Ground Structure for UWB Applications

摘要

In this paper, a novel low-pass filter using defected ground structure (DGS) slot with a protruded T-shaped strip inside the slot is presented. The resonant frequency of the slot can be easily controlled by changing the protruded T-shaped strips dimensions, without changing the area taken by the structure. Using this DGS slot, a quasi-elliptic low-pass filter was designed, fabricated, and tested. The experimental results show good agreement with simulation results and demonstrate that excellent stop-band performance could be obtained through the proposed low-pass filter. The filter has a cut-off frequency of about 3.4 GHz.