Title :
Metamaterial based negative refractive index traveling wave tube
Author :
Liu Chao ; Shuyan Guo ; Afsar, Mohammed N. ; Sirigiri, Jagadishwar R.
Author_Institution :
Tufts Univ., Medford, MA, USA
Abstract :
We present theoretical design of a high gain Traveling Wave Tube (TWT) amplifier using a metamaterial (MTM) structure and cold-test of the MTM structure. MTM structures have unique properties such as high effective permittivity and permeability which can be harnessed in a slow-wave structure (SWS) for enabling strong interaction with an electron beam to produce signal gain. The frequency selective properties of the MTM structure provide an interesting option to suppress parasitic oscillations usually encountered in a high gain amplifier. A rectangular waveguide loaded with a uniaxial electric MTM is employed in transverse magnetic mode to provide effective negative permeability and strong axial electric field. A SWS working around 6 GHz below the X-band waveguide TE10 cutoff frequency is fabricated. The experimental results of the cold-test of the SWS and particle-in-cell simulation results of the device showing the gain and output characteristics are presented in this paper.
Keywords :
electric fields; electron beams; frequency selective surfaces; metamaterials; microwave devices; oscillations; rectangular waveguides; refractive index; slow wave structures; travelling wave amplifiers; MTM structure cold-test; SWS; TWT amplifier; X-band waveguide TE10 cutoff frequency; electron beam; frequency 6 GHz; frequency selective properties; metamaterial structure; metamaterial-based negative refractive index traveling wave tube; parasitic oscillations; rectangular; signal gain; slow-wave structure; transverse magnetic mode; Electromagnetic waveguides; Electron beams; Electron tubes; Metamaterials; Permeability; Permittivity; Refractive index;
Conference_Titel :
Pulsed Power Conference (PPC), 2013 19th IEEE
Conference_Location :
San Francisco, CA
DOI :
10.1109/PPC.2013.6627598
