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Refraction

• Occurs when an RF wave crosses a boundary from one medium to another (i.e. from air to water). A wave entering

a medium at an angle will change direction

• Diffraction: It is the bending of RF waves around an object’s edge, such as a sharp corner or opening

• Objects that reﬂ ect and attenuate RF signals include:

• Metal objects

• Objects with metal in them

• Ground

• Circuit breaker boxes

• Trees: RF energy loss depends on the size and type of tree. Large trees with dense foliage create greater loss

• Walls: Interior walls create less RF energy loss and exterior walls, especially those with stucco, create greater loss

• Floors: Wood ﬂ oors create less RF energy loss and concrete and steel ﬂ oors create greater loss

• Mirrored walls have very high RF energy loss

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