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FET-based switched filters do not occupy a large space in the literature due to the high loss of the switches relative to other technologies. The Super-Lattice Castellated Field Effect Transistor (SLCFET) is a low loss, high isolation, broadband RF switch that meets this need. A 4 channel tunable band pass filter employing SLCFET switches in a splitter/combiner network was fabricated in order to demonstrate...
The Super-Lattice Castellated Field Effect Transistor (SLCFET) uses a super-lattice in the channel region to form multiple parallel current paths in conjunction with castellations etched into that super-lattice to provide a sidewall gate structure. The sidewall gate permits the gate applied electric field to penetrate between the parallel 2DEG layers, allowing the carriers to be depleted out prior...
A low loss, high isolation, broadband RF switch has been developed using a novel type of field effect transistor structure that exploits the use of a super-lattice structure in combination with a three dimensional, castellated gate to achieve excellent RF switch performance. Using an AlGaN/GaN super-lattice epitaxial layer, this Super-Lattice Castellated Field Effect Transistor (SLCFET) was used to...
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