Keywords: Radar antennas on USS Theodore Roosevelt SPS-64.jpg AN/SPS-46 V 9 radar antenna on the USS Theodore Roosevelt aircraft carrier This is an X-band 8-12 GHz marine navigational radar similar to types on civilian ships used to detect other ships in the vicinity It has a peak power of 7 kW a range of somewhere around 35 nautical miles This type of antenna is called a slot antenna and radiates a narrow vertical fan-shaped beam of microwaves about 15° high and 2 2° wide A motor in the housing below rotates the bar-shaped antenna to scan the beam around the horizon http //www navy mil/view_photos_top asp U S Navy PD-USGov-Military-Navy Ship radars of the United States Navy Waveguide antennas Aboard USS Theodore Roosevelt CVN-71 |