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Phase modulation and reflection of S-Band RF waves in cylindrical plasma: Effects of radius, density, and plasma type
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DOI：10.1016/j.rinp.2026.108712.png)
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Abstract
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• A novel three-component phase model is developed to dissect the S-band RF wave reflection from cylindrical plasma columns into distinct contributions: volumetric propagation, surface reflection, and effective boundary displacement. • Full-wave FDTD simulations quantitatively validate the analytical model, confirming that electron density governs the fundamental reflection magnitude, while column radius and collision frequency provide precise control over amplitude and phase. • Gas-specific performance is quantified: for a 7 mm column, argon yields a reflection amplitude of ∼0.36, nitrogen ∼0.12, and air ∼0.06, with phase shifts spanning 300°–355°. • High-reflectivity regime is identified for dense argon plasmas at smaller radii, achieving near-complete reflection ( ∼0.8) and a phase shift of 180°–200°, enabling their use as tunable, phase-engineered components in resonant S-band structures.
Keywords:
Plasma switch
S-band reflector
Drude permittivity
Collision frequency
Phase engineering
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