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BELL SYSTEM TECHNICAL JOURNAL 



alignment design for a wave-angle of 17.5 degrees. Comparison of 

 these diagrams with Figs. 3 and 4 shows a small loss in Ir resulting 

 from such design. Figures 7 and 8 are similar alignment design plots 

 for a wave-angle of 11 degrees. 



90 80 70 60 



ANCLE IN DEGREES 

 50 40 30 



2 3 



RELATIVE RECEIVER CURRENT 



Fig. 7 — Alignment design. Receiver current diagram of incident plane directivity 



for an 11° wave-angle. 



ANGLE IN DEGREES 

 90 80 70 60 50 40 30 



Fig. 8 — Alignment design. Receiver current versus azimuth angle for an 11° wave- 

 angle. 



Compromise Design Methods 



When an antenna output sacrifice must be tolerated to obtain 

 smaller dimensions, it is often desirable to design the system for 

 directive pattern alignment with the wave-angle, as mentioned above. 

 The methods of accomplishing this result will now be given. 



The effect on the directive pattern of reducing the height can be 

 largely compensated for by increasing the length. 



