Enhanced Bandwidth and Diversity in Real-Time Analog Signal Processing   (R-ASP) using Nonuniform C-section Phasers
  We show that a continuously nonuniform coupled line C-section phaser, as the limiting case of the step discontinuous coupled-line multisection commensurate and non-commensurate phasers, provides enhanced bandwidth and diversity in real-time analog signal processing (R-ASP). The phenomenology of the component is explained in comparison with the step-discontinuous using multiple-reflection theory and a simple synthesis procedure is provided. The bandwidth enhancement results from the suppression of spurious group delay harmonics or quasi-harmonics, while the diversity enhancement results from the greater level of freedom provided by the continuous nature of the nonuniform profile of the phaser. These statements are supported by theoretical and experimental results. 
Sajjad Taravati, Shulabh Gupta, Qingfeng Zhang and Christophe Caloz
physics.ins-det physics.optics