Power splitting in antenna array
There are a couple of issues with your implementation:

1) 1.4 dB of loss is about 28% power loss -1.4 =10*log10(P1/P0), so by cascading you end up losing quite a bit to a point of not being able to steer

2) matching: when you are splitting a 50 Ohm line into 2 50 ohm lines, the line in effect sees a 50||50 or 25 Ohms creating a large reflection. You may want to use a power splitter (e.g. Wilkinson power divider)

3) at 2 GHz your free space wavelength is 15 cm. If you are using a PCB trace (depending on type of transmission line and the properties of the PCB) it is even shorter (e.g. 10 cm). So, the lines that go to your phase shifters introduce quite a bit of delay. Make sure you take that into account.