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A ground plane is use in radio where the wave length is less than 1 half wave. It produced a false ground (Earth plane) making an image of a 1/4 wave signal reflect on to the aerial creating a half wave image. This improves the efficiency or the aerial, extending it's range.

Ground planes are used when the wavelength if the aerial is short or when the earth does not provide a good enough electrical path to ground. They can also be used to distort the polar pattern of the signal.

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12y ago

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