lobing

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Definition of lobing in English English dictionary

the tendency of a speaker system that consists of more than one driver to produce a lobed frequency response in space with in-phase reinforcement (lobes) from the various drivers occurring at some elevations and out-of-phase opposition (nulls) at points between the lobes

> In silver, wide convex ribs

Any time more than one speaker device covers the same part of the frequency range there will be some unevenness in the output (Picture the waves from one pebble dropped into a calm pool vs two pebbles dropped several inches apart ) Lobing means that the primary radiation pattern(s) is at some angle above or below the centerline between the two drivers Good crossover design takes this into account

The result of interference from reflections off surfaces surrounding the antenna This interference changes the target's return signal strength: sometimes it is stronger and sometimes weaker than expected The degree of lobing depends on the type of reflective surface; smooth ground or water produces the strongest effects The formation of maxima and minima of target signal strength at various angles of the vertical plane antenna pattern caused by the reflection of energy from the surface surrounding the radar antenna These reflections reinforce the main beam at some angles and detract from it at other angles producing "fingers of increased probability of detection" called "lobes" Between the lobes are "nulls" which are areas of decreased probability of detection The strengths of the lobes and nulls are dependent on the type of reflective surface Smooth ground or water produces the strongest effects

Due to the process of interference of two waves, one direct and one : reflected, differences in phases may cause larger or smaller amplitudes than expected for free space, causing differences in signal amplitudes measured : position of large numbers of dB's This process is called lobing