Design of Dispersive Delay Structures (DDSs) Formed by Coupled C-Sections Using Predistortion With Space Mapping
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The concept of space mapping is applied, for the first time, to the design of
microwave dispersive delay structures (DDSs). DDSs are components providing
specified group delay versus frequency responses for real-time radio systems.
The DDSs considered in this paper are formed by cascaded coupled C-sections. It
is first shown that aggressive space mapping does not provide sufficient
accuracy in the synthesis of DDSs. To address this issue, we propose a
predistortion space mapping technique. Compared to aggressive space mapping,
this technique provides enhanced accuracy, while compared to output space
mapping, it provides greater implementation simplicity. Two full-wave and one
experimental examples are provided to illustrate the proposed predistortion
space mapping technique.
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