Distributed Degenerate Band Edge Oscillator

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...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2021-03, Vol.69 (3), p.1821-1824
Main Authors: Abdelshafy, Ahmed F., Oshmarin, Dmitry, Othman, Mohamed A. K., Green, Michael M., Capolino, Filippo
Format: Article
Language:English
Subjects:
Antenna arrays
Cavity resonators
Coalescing
Coupled transmission line (CTL)
Couplings
degenerate band edge (DBE)
Dispersion
dispersion engineering
ladder oscillator
Load fluctuation
Microstrip
Modal choice
Oscillators
Power transmission lines
Radio frequency
radio frequency (RF) oscillator
Transmission line matrix methods
Transmission lines
Waveguides
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Summary: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 radio frequency (RF) sources, due to the unique features associated with 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.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2020.3018539