Collocations for radar - noun

enemy, police
airborne, ground, ground-based
long-range

be equipped with

operator
station, system
antenna, detector, equipment, instrument, receiver, scanner, transmitter
screen
beam, signal
image

by radar
navigation by radar

on radar
The submarine is impossible to detect on radar.

off the radar, on the radar
The aircraft suddenly went off the radar.
He's barely on the radar of most movie-goers. (figurative)