Active Transmission Lines Loaded with Resonant Tunneling Diodes and Their Application to THz Signal Generation and Processing

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This paper proposes a traveling wave amplifier based on transmission lines (TLs) periodically loaded with resonant tunneling diode (RTD) pairs. This TL can be regarded as a "lossy" TL with a negative loss because of the negative differential resistance of the RTD. This means that the TL can amplify signals while the signal travels along the line. One of the most important points to be investigated to realize this amplifier is the stability of the circuit. We discuss stability of the TLs periodically loaded with RTDs, and show that they can be stabilized by using composite right/left handed (CRLH) TL configuration. It is demonstrated using circuit simulation that this amplifier can have a gain for wide frequency range. In addition to this, we have demonstrated the possibilities of the high order harmonic oscillator using this type of active transmission lines.