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- W3209104962 abstract "Plasma behaves like metal when the frequency of the incoming electromagnetic wave is lower than the characteristic frequency $omega_{pe}$ of that plasma, and like an attenuator when frequency is higher than $omega_{pe}$ , and such property has been used in plasma reflector for radar [1], or as a corner reflector for antenna [2], or as an array for radar cross section reduction [3]. Here we report the simulation work using a FDTD code to study the behavior of a circular plasma tube array as an antenna reflector for simple beam switching. The plasma tube array is constructed by 48 plasma tubes forming a 30 cm diameter cylinder, and each tube is built with 60 cm long, 10 mm diameter glass tube containing Ar plus minute Hg plasma excited by either a 60 Hz or 22 KHz high voltage pulse. The plasma density is around 1011–1012 cm-3. Sections of the array can be switched on and off to direct the radiation coming out of a metal dipole antenna situated at the center of the cylinder to desired direction. Far field radiation pattern and near field electric field are calculated. Results indicate the operating frequency has strong effect on the switched beam pattern not only because of its relationship to the $omega_{pe}$ , the relative size of wavelength to the reflector is also very influential. The reflector has to be much larger than the dipole antenna inside the cylinder to form a good switched beam pattern." @default.
- W3209104962 created "2021-11-08" @default.
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- W3209104962 date "2018-06-24" @default.
- W3209104962 modified "2023-09-24" @default.
- W3209104962 title "FDTD Simulation of Circular Plasma Tube Array as Antenna Reflector" @default.
- W3209104962 doi "https://doi.org/10.1109/icops35962.2018.9575207" @default.
- W3209104962 hasPublicationYear "2018" @default.
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