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electrical tilt in GSM antenna

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eng_mus_1986

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can any one explain to me the mechanism of the electrical tilt in the GSM antenna.
thanks
 

I would assume a dipole group with phase shifted feed.
 

electrical tilt is preferred over mechanical tilt as ET causes regular and uniform changes in its pattern. Also remember this summary:

With the mechanical tilt, the coverage area is reduced in central direction, but the coverage area in side directions are increased.

With the electrical tilt, the coverage area suffers a uniform reduction in the direction of the antenna azimuth, that is, the gain is reduced uniformly.

source:**broken link removed**
 
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