Title :
Wave-front adaptive control structure (WACS) for quasi-optical power amplifiers in Intelligent RF front-ends
Author :
Xin, Hao ; Hacker, J.B. ; Sailer, A. ; Nagy, G. ; Higgins, J.A. ; Pilz, D. ; Rosker, M.J.
Author_Institution :
Raytheon Co., Tucson, AZ, USA
Abstract :
Tunable electromagnetic crystal (EMXT) surfaces are used as rectangular waveguide sidewalls to provide uniform excitation for quasi-optical power amplifiers. InP hetero-barrier varactors are monolithically integrated into periodic metal-dielectric structures to realize a reconfigurable EMXT surface that has a tunable resonance frequency from 30 to 45 GHz. Real-time reconfigurable (30 - 40 GHz) and low-loss quasi-TEM wave-front control with only 2-mm long EMXT waveguide section is demonstrated. Experimental results are in good agreement with design simulations. Such waveguides can be readily integrated into an intelligent RF front-end with self-assessment and self-adjustment capabilities.
Keywords :
adaptive control; periodic structures; power amplifiers; rectangular waveguides; varactors; 2 mm; 30 to 45 GHz; InP heterobarrier varactors; electromagnetic crystal; intelligent RF front-ends; low-loss wave-front control; monolithic integration; periodic metal-dielectric structures; quasiTEM wave-front control; quasioptical power amplifiers; real-time wave-front control; reconfigurable EMXT surface; reconfigurable wave-front control; rectangular waveguide sidewalls; self-adjustment capability; self-assessment capability; transverse electromagnetic; tunable EMXT surfaces; tunable resonance frequency; wave-front adaptive control structure; Adaptive control; Electromagnetic scattering; Electromagnetic waveguides; Indium phosphide; Intelligent structures; Power amplifiers; Radio frequency; Radiofrequency amplifiers; Rectangular waveguides; Surface waves; EMXT; HBV; Hetero-barrier varactors; TEM; electromagnetic crystal; surfaces; transverse electromagnetic;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2004.832053