Abstract
In this brief, an innovative terahertz (THz) ballistic deflection transistor (BDT) travelling wave amplifier (TWA) system is proposed. The BDT is an innovated technology device based on InGaAs/InAlAs/InP, able to operate at THz frequencies. The whole BDT TWA system design is based on a lossless THz transmission line called parallel plate dielectric waveguide with signal line (PPDWS). Parasitics for a single stage BDT amplifier and multiple-stage amplifier are also studied. In this brief a new thinner lossless PPDWS (transmission loss = 1.1 dB/mm) is developed. A new THz coupler applying the new PPDWS topology is also proposed and studied. It is shown that a 48-stage TWA system is able to provide a 15-dB gain at more than 1-THz frequency. Results compensate the low transconductance of the BDT and make the TWA a good choice for future THz amplifiers.
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