This article consists of a collection of slides from the author's conference presentation. A design for a multiplying antenna (multenna) has been proposed as a high power QO THz source. Prototype individual cells have been tested using an open ended waveguide setup, and good tripling performance has been observed. FSS filters have been designed, fabricated and tested with good performance in the desired bands. Further work includes the measurement of an array of multennas, and improvements to the multenna characterisation setup. Further proposed work is the incorporation of tunable organic semiconductors for system reconfiguration.