











1 -03 f c 





0.97 f„ 













2 





































A 



























\ 











































S 10 





















































































* ° 











1 





































































> 2 



























t- 4 



























-i 8 













A 

























/ 



/ 



P 









A 















K 



A 



A 



L 



A 





M 





~ 











i ' 



A 



»v 



^V 



i/W 



^ 







^ 





l\ A 



A 





' 



V t 





1 



V 



V 



r 





° 





/ / 



\ 



/ 





1 



/ 







\« A 



/ 







' 



\ 







Ld 



f 



v 





v\ 



> \ i 



\ r \ 





90° 



60° 



AZIMUTH ANGLE (°) 



Figure 8. SAMB time-delay pattern, beam 16L, 0.97 f , 1.03 f . 



The SAMB antenna system was implemented with the Mark X IFF system 

 and driven by a digital computer to scan over the ±45° sector to track random tar- 

 gets of opportunity. 



Experimental Radiation Patterns, SAMB Matrix Feed 



Typical patterns for various beam positions over a 30 percent frequency 

 band are shown in figures 9 through 23. It is observed that the side-lobe level 

 increases rather quickly when the frequency is changed beyond ± 10 percent of the 

 design frequency for the various beam positions. The beam-position shift due to 

 frequency results in about 15° shift over the 30 percent band for beam 14L, the 

 position of which at the design frequency is 52°. Similar results are also present 

 for the other beam positions, but at a magnitude proportional to the angle off broad- 

 side and to the frequency increment. Figure 24 shows a composite pattern of all 

 beams giving full 45° sector coverage. Note that 14 beams adequately cover the 

 scanning sector. 



14 



