A MULTIPLE UNIT STEERABLE ANTENNA 419 



The broad band of the MUSA reflects the fact that, with the terminal 

 at the "leeward" end as assumed heretofore, the delay of the space 

 paths is nearly the same as that of the transmission-line paths so that 

 if the antenna outputs are phased to add at one frequency they will 

 nearly add at other frequencies. If the terminal is located at the 

 center of the MUSA to economize on transmission line, the frequency 

 range is greatly reduced. The broad band may be regained, however, 

 by delays introduced in the receiving equipment. With a center loca- 

 tion, the antennas in the forward and rearward sections of the MUSA 

 must have their phases shifted oppositely, and, unless certain other 

 compensating networks are provided, the two phase shifts must be 

 coupled in different phase relations for different wave-lengths. 



