کنفرانس بین المللی میکروالکترونیک ایران

صفحه اصلی / هفتمین کنفرانس بین المللی میکروالکترونیک ایران

Scattering and Absorption Analysis of RF Waves in Tunable Plasma Antennas Based on NEMS Structures

نویسندگان :

Ali Asghar Molavi Choobini¹ Rashid Riahi² Farkhonde Zamaninejad³ Sara Sadat Ghaffari-Oskooei⁴

1- دانشگاه تهران 2- دانشگاه آزاد اسلامی واحد شهرکرد 3- دانشگاه شهید بهشتی 4- دانشگاه الزهرا(س)

کلمات کلیدی :

Plasma antenna،scattering pattern،scattering cross section،cold plasma

چکیده :

In present study, a rigorous analytical framework to model the interaction of obliquely incident monochromatic waves with cylindrical plasma columns subjected to external magnetic fields is investigated. The plasma is treated as a cold, collisional, anisotropic dielectric medium, with its tunable characteristics governed by variations in electron density, magnetic field strength, radius, and wave incidence angle. By applying cylindrical harmonic expansions and enforcing boundary continuity conditions, we derive closed-form expressions for the scattered electric fields and back-scattering differential cross-section. The model captures the effects of temporal and spatial modulations introduced via Nano-Electro-Mechanical Systems (NEMS), revealing rich dependencies of the scattering profile on plasma and wave parameters. Systematic numerical implementations validate the theoretical predictions and unveil key insights into back-lobe narrowing, angular beam steering, mode-resolved scattering, and resonance-like enhancements. A series of parametric studies—spanning variations in electron density, magnetic field intensity, radial scaling, harmonic mode content, and incident angle—demonstrate how directional scattering can be dynamically controlled.