AbstractCoupled line filters are widely used in modern microwave communication systems. The classical parallel-coupled transmission-line-resonator filter developed by Cohn has two main shortcomings when designed in microstrip technology: 1) the presence of spurious passbands at the
harmonic responses; 2) the dificulty to design wideband filters. When the classical approach fails, alternative solutions are needed. In this work, we investigate whether introducing slots in the ground plane can result in wideband filters with a low insertion loss. The aim of this thesis is to examine the eect of resonant apertures in the ground plane of microstrip structures and to investigate their potential benets in filter design.
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