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What is dBi

Chapter 55
Encyclopedia of Networked and Virtual Organizations
Represents the gain of an antenna compared to the gain of an isotropic antenna. It is decibels with reference to an isotropic antenna. An isotropic antenna has a gain of 1 (0 dB). It radiates uniformly in all directions of space.
Published in Chapter:
Development of a University Networking Project
Almudena Moreno Mínguez (Universidad de Valladolid, Spain) and Enrique Crespo Ballesteros (Universidad de Valladolid, Spain)
Copyright: © 2008 |Pages: 14
DOI: 10.4018/978-1-59904-885-7.ch055
Abstract
A communications channel has an important dependence for the channel capacity (C, in bps) to channel bandwidth (W, in Hz) ratio; this is capacity per unit bandwidth on signal to noise ratio (S/N, power of the signal over power of noise). Shannon’s formula gives an upper limit for this dependence (Shannon & Weaver, 1949), C/W=log2 (1+S/N), which represents channel efficiency. Phase lock loops for waves and data symbols in the presence of noise have been given (Reis, Rocha, Gameira, & Carvalho, 2005).
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