Recent Advances in Millimeter-Wave NRD-Guide Circuits

Though millimeter wave applications have attracted much attention in recent years, they have not yet been put to practical use. The major reason for the failure may be a large transmission loss peculiar to the short wavelength. In order to overcome the inconvenience, it may be promising to introduce the technology of millimeter-wave NRD-guide circuits. In this technology, not only NRD-guide but also Gunn diodes and Schottky diodes play the important role in high bit-rate millimeter-wave applications. A variety of practical millimeter wave wireless systems have been proposed and fabricated. Performances and applications of them are discussed in detail as well. key words: millimeter waves, NRD-guide, mmNRD-circuits, ASK modulator, BPSK modulator, BPSK demodulator, Costas loop, linear polarized MIMO, uncompressed HDTV