Up to now, the most widely used wireless communication band is located in the frequency range between 0.3 and 3.5 GHz [1]. Emerging high-bandwidth applications, which include next-generation smart cell phones [1] and wireless linking for three-dimensional (3D) super high-definition television (SHDTV) [2], however, have made the case of even higher wireless carrier frequencies convincing. Lately, a number of groups reported links for the millimeter-wave (MMW) bands at 60 GHz (V-band) and 120 GHz (D-band). Frequencies as high as 300 GHz, i.e., sub-THz or MMW are being considered due to their “unlicensed” usage [1–7].