A phased array antenna system with variable electrical tilt comprises an
array (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 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) 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 (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).