TUNABLE PHASE SHIFTER AND/OR ATTENUATOR

摘要

PROBLEM TO BE SOLVED: To provide a tunable phase shifter and/or attenuator capable of operating at microwave, millimetric and/or sub-millimetric wavelengths with an improved tunability. SOLUTION: The tunable phase shifter and/or attenuator includes: a waveguide having a channel and a piece of photo-responsive material disposed within the waveguide from an internal wall of the channel at an interval, a light source to emit light so as to impinge on at least a part of the photo-responsive material, the light source generates in the photo-responsive material a carrier concentration between 1012cm-3and 1016cm-3so as to modify the real and the imaginary part of the dielectric constant of the photo-responsive material to generate at least one mode that has a part of its field inside the photo-responsive material layer and a part of its field in the waveguide whereby the phase shifter and/or attenuator that is dependant on the light illumination is generated over a frequency range. COPYRIGHT: (C)2010,JPO&INPIT