I. Introduction
Spectra around 77 and 94 GHz are well-known windows for automotive radar applications [1] [2]– [4] and radio astronomy/passive sensing [5], [6]. Recently, the Federal Communications Commission (FCC) has opened the commercial use of spectrum in the 71–76GHz, 81–86GHz, and 92–95GHz bands [7]. These bands are suitable for high-speed wireless local area networks (WLAN), and broadband MMW applications. For commercial products, the wireless local area network bridge from 71GHz to 86GHz was reported in [8], which provided LAN connections with a RF output power of 17dBm and amplitude shift keying (ASK) modulation.