I. Introduction
The millimeter wave (mmWave) band is the frontier for commercial – high volume consumer – wireless communication systems [1]. MmWave makes use of spectrum from 30 GHz to 300 GHz whereas most consumer wireless systems operate at carrier frequencies below 6 GHz. The main benefit of going to mmWave carrier frequencies is the larger spectral channels. For example, channels with 2 GHz of bandwidth are common for systems operating in the 60 GHz unlicensed mmWave band. Larger bandwidth channels mean higher data rates. Despite the recent interest in mmWave, the study of mmWave is in fact as old as wireless itself. Some of the first experiments like those of Bose and Lebedev [2] were performed in the 1890s in the mmWave band.