Design of meander line defected waveguide structure

The meander line Defected Waveguide Structure (DWS) is studied in Ultrawideband (UWB) frequency range. Four different meander line configurations of DWS are designed by using the CST Microwave software. The simple basic square is first designed with gap separation in between. The straight connecting strip is then designed between the squares. The straight connecting strip is folded by using meander line technique. Meander line designs reduce the gap separation but maintain the original length of connecting strip. The performances of all meander line DWS designs towards waveguide are observed through transmission coefficient (S21) and reflection coefficient (S11). All the meander line DWS designs show mostly similar results of S21 and S11 to operate around 8GHz-11GHz with compact size. Design D which has both meander sections in different orientation without a small gap separation between meander sections shows the highest S21 of −4.89dB at 9.69GHz. Design A with one meander section shows widest bandwidth of 3.12GHz from 7.68GHz-10.8GHz.