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) conver...

A phased array antenna system with electrical tilt control incorporates a tilt controller (62) for splitting an input signal into three intermediate signals, two of which are delayed by variable delays T1 and T2 relative to the third. A corporate feed (64) contains splitters S3 to S10 and hybrids H1 to H6 for proces...

An electrically tilted antenna system with polarisation diversity has a dual polarised, tilt adjustable antenna (32). The antenna (32) has dipoles (34, 36) of two orthogonal polarisations associated with independently adjustable electrical tilt angles. The tilt angles are implemented by relative delays between corpo...

A phased array antenna system with controllable electrical tilt generates two signals V2a and V2b with variable relative delay there between. The signals are converted into antenna element drive signals by a power distribution network (100). The network (100) splits each of the two signals V2a and V2b into three ...

An antenna system (50) for shared operation has three antenna stacks (ASI to AS3) each with two mutually orthogonal polarisations (445 degree and -45 degree). It is for use with multiple base stations (51 to 53). It combines on to a single feeder (62, 64) signals associated with like polarisation and with the base s...

A diversity antenna system with electrical tilt has two dual polarised, tilt adjustable antenna stacks (44A) and (44B) with physical separation providing space diversity. Each antenna stack (44A) or (44B) has two polarisations associated with independently adjustable electrical tilt angles. The electrical tilt angle...

An antenna system for sharing of operation employs contiguous transmit frequencies. Transmit frequencies are separated into non-contiguous sub-groups isolated from one another by filters 158(+) and 160(-) associated with positive and negative polarisation. Received frequencies are filtered and split into five signal...

A phased array antenna system with adjustable electrical tilt includes an array (62) of antenna elements 621 to 6210 ll has a splitter (44) dividing a radio frequency (RF) carrier signal into two signals between which a phase shifter (46) introduces a variable phase shift. Further splitters (52) and (54) divide the ...