Dielectric-loaded self-resonant LSA diode

The realization of the predicted dc to RF conversion efficiency of LSA oscillators operating around 100 GHz is expected to require low-loss resonant circuits. At these higher frequencies, the practical difficulties attendant upon the construction of conventional waveguide elements suggest that a more compact resonant circuit may be useful. The resonator studied theoretically in the present paper takes advantage of the self-resonance of a cylindrical LSA diode loaded externally by a concentric dielectric ring. By this means, a design consistent with heat dissipation requirements for CW operation is reached for frequencies in excess of 70 GHz.