"The BARS uses transmit/receive modules, which in
the receive path use individual per element (slot)
low noise GaAs uses receiver chips, providing them
with the sidelobe and sensitivity advantages of the
AESA, enhancing its range and jam resistance.
In the transmit path, the BARS uses a classical
passive array design, driven by a waveguide and
Travelling Wave Tube transmitter. This was a
typical Russian approach, as the US, Israelis and
EU would not provide access to the GaAs power
transistor technology needed to build a genuine
AESA. The principal benefits of an AESA over a
hybrid ESA are only in reliability and lower transmit
sidelobe performance, less than critical for a nonstealthy
fighter design."
the Bars is a very capable radar...the difference with the JSF's AESA are that the AESA would have a high ping frequency and thus a better resolution...