optical spectrum frequency communications
81Computers and Information Systems — ▪ 2009 Introduction Smartphone: The New Computer. The market for the smartphone in reality a handheld computer for Web browsing, e mail, music, and video that was integrated with a cellular telephone continued to grow in 2008. According to… …
82Distributed transmission system — This article is about terrestrial broadcasting. For electrical power distribution, see distributed generation. In North American digital terrestrial television broadcasting, a distributed transmission system (DTS or DTx) is a form of single… …
83Metamaterial — Negative index metamaterial array configuration, which was constructed of copper split ring resonators and wires mounted on interlocking sheets of fiberglass circuit board. The total array consists of 3 by 20×20 unit cells with overall dimensions …
84Wi-Fi — For the radio station, see WIFI (AM). Wi Fi logo Wi Fi (  / …
85Refractive index — Refraction of light at the interface between two media. In optics the refractive index or index of refraction of a substance or medium is a measure of the speed of light in that medium. It is expressed as a ratio of the speed of light in vacuum… …
86Superheterodyne receiver — A 5 tube superheterodyne receiver made in Japan around 1955 In electronics, a superheterodyne receiver (sometimes shortened to superhet) uses frequency mixing or heterodyning to convert a received signal to a fixed intermediate frequency, which… …
87IS-95 — Samsung cdmaOne mobile phone disassembled Interim Standard 95 (IS 95) is the first CDMA based digital cellular standard by Qualcomm. The brand name for IS 95 is cdmaOne. IS 95 is also known as TIA EIA 95. It is a 2G mobile telecommunications… …
88Digital Radio Mondiale — (abbreviated DRM; mondiale being Italian and French for worldwide ) is a set of digital audio broadcasting technologies designed to work over the bands currently used for AM broadcasting, particularly shortwave. DRM can fit more channels than AM …
89Nantenna — Figure 1. Spectral irradiance of wavelengths in the solar spectrum. The red shaded area shows the irradiance at sea level. There is less irradiance at sea level due to absorption of light by the atmosphere. A nantenna (nanoantenna) is a… …
90Terrestrial television — Air TV redirects here. For the anime, see Air (visual novel). Terrestrial television is a mode of television broadcasting which does not involve satellite transmission or cables typically using radio waves through transmitting and receiving… …
