M.Sc. Henning Poensgen

The increasing demand for high-data-rate wireless communication systems has driven research into the D-band frequency range (110–170 GHz), where circuit parasitics and interconnect effects become critical design limitations. Even small impedance mismatches at interconnects and device interfaces can significantly degrade gain, noise performance of a receiver system. As a result, reconfigurable matching networks and impedance tuners can be employed to alleviate mismatch.

This thesis focuses on the design and investigation of reconfigurable matching networks for D-band applications, targeting both single-pole and multi-pole resonator-based circuits. In regions close to the maximum oscillation frequencies of active components it is challenging to design moderate/high Q-factor variable capacitors. Thus, the performance trade-off between tuning range, insertion loss and bandwidth becomes more pronounced than in sub-mmW frequency ranges. 

The analysis and design will take place using Keysight ADS and Cadence Virtuoso.

This thesis is not limited to matching networks but can also revolve around baluns and couplers, too.