Essentials of Radio Wave Propagation by Christopher Haslett

By Christopher Haslett

If you would like to maximise potency in instant community making plans, this speedy reference advisor to an more and more advanced and hard subject is for you. utilizing real-world case experiences, functional difficulties and minimal arithmetic, the writer explains easily and obviously how you can are expecting sign strengths in numerous events. extra subtle equipment, which shape the root of software program instruments for either community making plans and spectrum administration, also are defined. it will be a useful source for community planners, designers, spectrum managers, senior technical managers and coverage makers.

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For very short distances, the prediction for both antenna heights is close to that for free space (as may be expected). Also, for very large distances (approaching 1000 km) the difference between the predicted signal strengths is very small. At a distance of 25 km, however, the difference between the predictions for the two heights peaks at about 15 dB. In order to understand this, it is important to appreciate the effect of the curvature of the Earth. When you look out at the horizon, the distance to the horizon depends on your height.

Sectored antennas have a reflector that directs the power in a particular direction. This provides more gain than would an equivalent omni-directional antenna. When using sectored antennas, it is common to find three antennas on a base station providing s u m m a r y 49 complete panoramic coverage between them. Mobile-station antennas are omni-directional because requiring the user to point the antenna in a particular direction would be seen as highly inconvenient. All predictions of coverage are made assuming a certain receiver sensitivity.

Although these methods usually make better predictions of the signal strength in the shadow of obstacles, they require significantly more computing time as well as being significantly more complicated to implement. Once an understanding of the properties of a diffracted signal has been obtained, it is possible to derive clearance requirements for a point-to-point path so that diffraction effects may be safely ignored. The insights gained by investigating the mechanism of diffraction into the shadow of an obstacle can be used to analyse two related phenomena: reflection from a finite surface and the formation of the radiation pattern of an aperture antenna.

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