TARGETS FOR MICROWAVE RADAR NAVIGATION 



861 



The present investigation led to the discovery that the response pattern 

 of a corner reflector can be modified by a suitable alteration of the geometri- 

 cal configuration of the aperture. There is even the suggestion that the 

 response can, to a certain degree, be made to conform to a somewhat arbi- 

 trary pattern \\ ithin a region extending to approximately 30° from the princi- 

 pal axis. The procedure for accomplishing this has, so far, been one of trial 

 and error since the difficulties of a general mathematical solution appear to be 



(a) (b) 



Fig. 9 — Compensated comer reflector. 



Fig. lO^Dimensions of face of compensated reflector. 



insurmountable, at least in a practical sense. For practical purposes, how- 

 ever, it is comparatively easy to conduct a few graphical experiments in order 

 to design a reflector having the desired response pattern. 



Figures 9a and 9b show two views of a modified corner reflector which w as 

 designed to have a relatively flat response characteristic out to angles of 30° 

 from the central axis. Each of the three sides of the reflector, instead of 

 being triangular as formerly, has the contour shown in Fig. 10. The 

 shaded regions of Fig. 10 represent the surface which has been added. 



