Ion Oprea

Highly responsive planar millimeter wave zero-bias schottky detector with impedance matched folded dipole antenna

A compact highly responsive planar zero-bias Schottky detector is proposed for uni-planar and low-cost fabrication. Various zero-bias Schottky diodes are investigated, in particular the optimization of impedance matching by the antenna design itself. The realized folded dipole based detector demonstrates an outstanding system voltage responsivity of 7,079 mV/mW at 86 GHz without lenses or pre-amplification.

Compact Schottky barrier diode receiver for E-Band (60–90 GHz) wireless communications

A compact E-Band receiver based on a zero bias Schottky barrier diode, folded dipole antenna and hyperhemispherical silicon lens for wireless communications is presented. Zero bias Schottky diodes were designed and manufactured, and all their parameters were extracted. The folded dipole antenna is designed in such a way that maximum power is transferred from it to the Schottky diode, so the responsivity of the overall receiver will be improved. In addition, a study on the optimal hyperhemispherical silicon lens for this antenna has been undertaken.

THz Schottky diodes on epitaxial AlGaAs-membrane

Schottky structures based on quasi-vertical diode (QVD) design concept are essentially improved by optimization of the GaAs/AlGaAs wafer layout and fabrication process. Insertion of a 4 mum-thin epitaxial AlGaAs layer permits more accurate micromachining of the membrane-substrate without significant degradation of anode parameters. This greatly improved repeatability and increased the yield of the fabrication process. New technology tolerances allowed further optimization of structure geometry, which in turn led to achievement of state-of-the-art mixer performance at millimeter-waves.