RADAR ANTENNAS 



293 



The commander of another submarine wrote in a similar vein, "You can 

 rest assured that we don't regard your gear as a bushy-brain space taker, 

 but a very essential part of our armament". 



I'ig. 45 -Tlie SJ Submarine Radar Antenna. 



Figure 45 is a photograph of an SJ antenna, 

 characteristics are as follows: 



Its principal electrical 



Gain > 19 db 



Horizontal Half Power Beamwidth 8° 



Vertical Half Power Beamwidth 18° 



Vertical Beam Character — Some upward radiation 



Lobe Switching Beam Separation — approximately 5° 



Gain reduction at beam cross-over < 1 db 



Polarization — Horizontal 



