A new technique to design Wide Band Switched-Line True Time Delay Networks

What is it about?

This study investigates the Constant-Delay (CD) behavior of Switched Line Phase Shifters (SLPS) based on Single Pole Double Throw (SPDT) switches. Circuit sizing starts considering the effective S-parameters of the switches, to use their non-idealities as an integral part of the phase shift (PS) linearly dependent to the frequency and considering, from the beginning, the possible spatial positioning of elements that allows the circuit feasibility as a design target. The aim of this study is to provide a technique suitable for the design of well matched TTD networks with a flat delay in wide bandwidth.

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Why is it important?

In this paper we propose new design formulas for which we show a single-frequency implementation. A computational strategy is used to obtain numerical solutions of the derived equations with this study. Finally a monolithic X-Band TTD circuit example is shown.