Wideband Glide-Symmetric Slow-Wave Structure for Millimeter-Wave Sheet Beam TWTs

TL;DR

This paper presents a novel wideband glide-symmetric slow-wave structure for millimeter-wave sheet-beam TWTs, enabling stable, broad bandwidth operation in the V-band through topological design features.

Contribution

It introduces a glide-symmetric SWS with topological properties that achieve wide bandwidth and stability for millimeter-wave TWTs, operating over 55-68 GHz.

Findings

Operates in the 55-68 GHz V-band.

Achieves wide bandwidth and stable operation.

Design utilizes topological properties to optimize performance.

Abstract

We introduce a slow-wave structure (SWS) for a millimeter-wave sheet-beam traveling-wave tube (TWT) with wide bandwidth. The wideband and stable operation is enabled through the topological properties associated with glide-symmetry that close the bandgap at the $3\pi$-point and also make the on-axis interaction impedance negligible for the backward wave. This space harmonic structure is designed to operate in the $V$-band over 55-68 GHz with synchronism to a 5.2 kV, 11 mA sheet electron beam that will be produced by a diamond field-emitter array.