854 



BELL SYSTEM TECHNICAL JOURNAL 



corner. The latter restriction constitutes the principal objection to the 

 practical use of dihedrals. The path of a typical ray is shown in Fig. 1. 



Fig. 1 — Dihedral comer reflector. 



A A. 



A 

 r 



I 

 I 

 I 

 I 

 I 



b 



I 

 I 

 I 

 I 

 I 

 I 

 I 



i 



e=20' 



I IK 2 Variation of effective area of a dihcclral with aspect angle. 



Tlie effective area of a dihedral reflector depends upon both the size of the 

 reflector and the orientation of the reflector with respect to the incident rays. 

 iMgure 2 shows how the effective area varies as the dihedral is rotated about 

 the line of intersection of the two planes. The elTective areas for the differ- 

 ent orientations are shown by the shaded regions in the lower part of the 



