I. Introduction
The future of wireless communications needs to address the increasing need for bandwidth in order to enable transmission of data rates up to 100 Gb/s [1], [2]. An increase of bandwidth can be achieved either through the use of higher order modulation formats [3] or by increasing the carrier waves frequencies into the Millimeter- (MMW) and Terahertz-wave (THz) frequencies, which cover the range from 30 GHz to 3 THz, using simple modulation techniques [4]. The latter offers a cost effective solution which has the additional advantage of avoiding coding/decoding latencies. Recent experimental results reported data rates up to 48 Gb/s on a 300 GHz carrier frequency [4] . One of the bottlenecks for these systems is the generation of the carrier waves at these frequencies with the required signal quality.