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This paper presents a bandpass filter using half-mode substrate integrated waveguide (HMSIW) and modified U-shaped defected ground structure (DGS) slot-pairs. As both loaded into HMSIW, the modified DGS, compared with the original one, can contribute to improving the upper-side selectivity and expanding the stopband. Measured results are in good agreement with the simulations. In comparison with several...
In this paper, three different defected ground structure (DGS) patterns are proposed and loaded into quarter-mode substrate integrated waveguide (QMSIW) to implement three size-reduced bandpass filters. Using QMSIW can achieve a size reduction nearly 75% with respect to its substrate integrated waveguide (SIW) counterpart. Furthermore, the utilization of DGS can further reduce size over 40% compared...
In this paper, a substrate integrated waveguide -to- defected ground structure (SIW-DGS) cell is proposed and used to implement a symmetric modified doublet filter. The utilization of proposed SIW-DGS cell can increase the coupling strength of the master transmission path in filter, thus resulting in the enhancing of bandwidth. And the source-load coupling generated by SIW-DGS cells can also improve...
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