Design of Dispersive Delay Structures (DDSs) Formed by Coupled C-Sections Using Predistortion with Space Mapping

TL;DR

This paper introduces a novel predistortion space mapping method for designing microwave dispersive delay structures formed by coupled C-sections, improving accuracy and simplicity over existing techniques.

Contribution

It applies space mapping to DDS design for the first time and proposes a predistortion approach that enhances accuracy and implementation simplicity.

Findings

Predistortion space mapping improves DDS synthesis accuracy.

The method outperforms aggressive and output space mapping techniques.

Experimental results validate the proposed approach.

Abstract

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.