Distributed Degenerate Band Edge Oscillator
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Distributed Degenerate Band Edge Oscillator

  • Author(s): Abdelshafy, Ahmed F
  • Oshmarin, Dmitry
  • Othman, Mohamed AK
  • Green, Michael M
  • Capolino, Filippo
  • et al.
Creative Commons 'BY' version 4.0 license
Abstract

We propose a new class of oscillators by engineering the dispersion of two-coupled periodic waveguides to exhibit a degenerate band edge (DBE). The DBE is an exceptional point of degeneracy (EPD) of order four, i.e., representing the coalescence of four eigenmodes of a waveguide system without loss and gain. We present a distributed DBE oscillator realized in periodic coupled transmission lines with a unique mode selection scheme that leads to a stable single-frequency oscillation, even in the presence of load variation. The DBE oscillator potentially leads to a boost of the efficiency and performance of RF sources, thanks to the unique features associated to the EPD concept. This class of oscillators is promising for improving discrete-distributed coherent sources and can be extended to radiating structures to achieve a new class of active integrated antenna arrays.

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