| 摘要 |
A phased array antenna system with variable electrical tilt comprises an array ( 60 ) of antenna elements ( 60 L 1 ) 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 on 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 ( 56 <SUB>1</SUB>) etc. combine pairs of divided signals from different power splitters ( 52, 54 ) this provides vector sum and difference components with appropriate phase for supply to respective pairs of antenna elements ( 60 U 1, 60 L 1 ) 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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