English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We demonstrate the existence of a special degeneracy condition, calleddegenerate band edge (DBE), between two Bloch modes in periodically loadedcircular all-metallic waveguides at microwave frequencies. The DBE conditionhas been associated with a dramatic reduction in group velocity and with someunique resonance properties, but it has not been shown in hollow waveguidestructures yet. Hence, we show here its existence in two periodic waveguideexamples. The unit cell of the first case is composed of a circular waveguideloaded with two inner cylinders with elliptical irises with misaligned angles.The second structure is composed of loading the waveguide with ellipticalrings. The demonstration of DBE in those waveguide is explained through asimple multi transmission line approach where the conditions to obtain DBE areclarified, and suggests that the DBE can occur in several other analogousperiodic waveguide. These structures can be potentially used to investigateunconventional gain schemes in traveling wave tubes or other kinds ofdistributed amplifiers and novel pulse compressors.

Demonstration of a Degenerate Band Edge in Periodically-Loaded Circular Waveguides