The demand for analog signal processing (ASP) is rising for high-speed and highfrequency systems. In some ASP systems, the core is dispersive delay structure (DDS). DDS creates a steady increase or decrease in group delay over frequency bandwidth. One of the popular methods for designing DDSs is the use of coupled C-sections structure. Analysis of the coupled C-sections was based on the analysis of N coupled-lines network. In this paper, we employ a fast approach for analyzing N coupled-lines network that does not need solving an eigenmodes problem. Moreover, we propose a novel DDS structure based on the coupled composite right/lefthanded (CRLH) transmission lines with interdigital capacitors and short stub inductors. The proposed DDS operates between 3 to 3.5 GHz with relatively high group delay slope (about 5.5 ns). The measurements are presented for scattering parameters and group delay to compare with simulated results.
K E Y W O R D SCRLH, C-section, DDS, dispersive delay structure, group delay, metamaterial
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