With the opening of millimeter-wave spectrum to commercial
communications, a number of companies are developing practical
solutions for high-speed data access. Millimeter-wave
frequencies represent the next great frontier for broadband,
albeit limited range, communications. Since the United States
Federal Communications Commission (FCC) and other global
regulatory agencies have designated or freed bandwidth at
millimeter-wave frequencies for point-to-point communications
links (see Microwaves & RF, August 2007, p. 40), a number of
companies at the system level have experienced increased
interest in their high-frequency links while some companies at
the component level have shared in the enthusiasm. The growing
demand for high-speed voice, data, and video interconnections
around the world is driving frequency regulators to free up
spectrum at millimeter- wave frequencies. Millimeter-wave
frequencies are generally accepted to be in the range from 30 to
300 GHz, with the name coming from the small size of the si