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How does an antennas reactive field couple?

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microfielder12

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Why does antenna loading actually occur? In placing an object in the reactive near field the antenna resonance frequency shifts, but why? Is there a 'physical' connection (inductance/capacitance in the space between them) that causes the antenna to appear longer, thus alter the resonance frequency?
Thank you
 

In the Reactive Near Field region of the antenna the E and H fields are not orthogonal, so any object coupled to the antenna in this region will distort the radiated pattern and affect the resonant frequency.
 
Why affect the resonant frequency? Has the length of the antenna changed?
 

The antenna could be compared to an LC resonant circuit. Coupling more capacitance to the C of the antenna will change the resonant frequency.
 

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