Lecture3

Subsequentlyallowsforaccurate

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Unformatted text preview: and match the receiving antenna to the orientation of the satellites antenna Antenna Beamforming Antenna Beamforming Desirable to concentrate the radiated electromagnetic energy into a directional beam Makes possible the illumination of a specific area in space – Subsequently allows for accurate determination of the location from which the reflected energy is returned Half­wave dipole antenna Half­Wave Dipole Antenna Half­Wave Dipole Antenna Physical length must be λ/2 for an ungrounded antenna Radiates its energy in all directions perpendicular to its axis There can be no signal coming from the ends Signal is radiated outward like a donut Have­Wave Dipole Antenna Have­Wave Dipole Antenna Beamforming Beamforming Reflectors – Capitalize on reflectivity of waves, increasing directivity – Satellite Signal Beamforming Beamforming Arrays – Arranges half­wave antennas such that their fields add together in a specific direction and cancel in others Wave Propagation Wave Propagation Ground Waves Sky Waves Space Waves Electromagnetic Spectrum Electromagnetic Spectrum Wave Propagation Wave Propagation Electromagnetic waves traveling through the atmosphere are subject to many factors that affect range of signal – Reflection off physical things like buildings, mountains, ground – Refraction from different layers in a...
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This document was uploaded on 03/28/2014.

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