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Introduction
1.1Need for Millimeter Waves
Marconi demonstrated the first transatlantic wireless transmission in the early 1900s, marking the beginning of wireless technology. The data transmissions in the early days were concerned with binary messages and gradually evolved to become advanced data transmission. This evolution in turn meant that the carrier frequency and its associated bandwidth had to be increased. The explosion of wireless devices is primarily a result of the wireless revolution that started in the 1980s. The first generation cellular was primarily analogue in nature, needing crude resonant antennas for communication. It involved simple frequency modulated schemes for data transaction, so modulators and demodulators ...
