m0101-Wireless Channels - Connexions module m0101 1...

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Unformatted text preview: Connexions module: m0101 1 Wireless Channels * Don Johnson This work is produced by The Connexions Project and licensed under the Creative Commons Attribution License † Abstract A basic analysis of wireless channels and their transfer characteristics. Wireless channels exploit the prediction made by Maxwell's equation that electromagnetic elds propagate in free space like light. When a voltage is applied to an antenna, it creates an electromagnetic eld that propagates in all directions (although antenna geometry a ects how much power ows in any given direction) that induces electric currents in the receiver's antenna. Antenna geometry determines how energetic a eld a voltage of a given frequency creates. In general terms, the dominant factor is the relation of the antenna's size to the eld's wavelength. The fundamental equation relating frequency and wavelength for a propagating wave is λf = c Thus, wavelength and frequency are inversely related: High frequency corresponds to small wavelengths....
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