Experimental multiple frequency injection-wave generator

The design of an optically activated multiple frequency injection-wave generator is presented. This generator naturally lends itself as a suitable microwave source for large phased arrays. The system consists of an output transmission line and static energy storage segments spatially placed with half wavelength separation. Each segment is isolated from the output line by a bulk GaAs switch. The injection-wave generator is initiated when the switches are simultaneously closed. The static electrical energy is then injected into the output transmission line, as defined by the spatial arrangement. The system is driven by a single 35 ps laser source whose output is divided by a fiber bundle for delivery to the individual switches. The versatility of the generator is demonstrated by the production of multiple frequencies. Experimental results are compared with simulation models.