| 摘要 |
A phased array antenna system with variable electrical tilt comprises an arr ay (60) of antenna elements (60L1) etc. incorporating a divider (44) dividing a radio frequency (RF) carrier signal into two signals between which a phase shifter (46) introduces a variable phase shift. A phase to power converter (50) converts the phase shifted signals into signals with powers dependent o n the phase shift. Power splitters (52, 54) divide the converted signals into two sets of divided signals with total number equal to the number of antenna elements in the array. Power to phase converters (561), etc. combine pairs o f divided signals from different power splitters (52, 54): this provides vecto r sum and difference components with appropriate phase for supply to respectiv e pairs of antenna elements (60U1, 60L1) etc.located equidistant from an array centre. Adjustment of the phase shift provided by phase shifter (46) changes the angle of electrical tilt of the antenna array (60).
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