HORIZONTAL RHOMBIC ANTENNAS 



141 



90 80 70 



ANGLE IN DEGREES 

 60 50 40 



I 2 



RELATIVE RECEIVER CURRENT 



Fig. 3 — Maximum output design. Receiver current diagram of incident plane 

 directivity for a 17.5° wave-angle. 



ANGLE IN DEGREES 

 90 80 70 60 50 40 30 



Fig. 4 — Maximum output design. Receiver current versus azimuth angle for a 17.5° 



wave-angle. 



directive diagram becomes necessary. Such an alignment can be 

 achieved by the method described below, but only by a small sacrifice 

 in the amplitude ^ of Ir at the required wave-angle. 



The Alignment Design Method 



Since by our previous method of design the height factor of equation 

 (2) was aligned with the wave-angle, it is necessary to change either or 

 both of the dimensions / and to secure the best output under the 

 limiting alignment condition. This limiting condition is obtained as 



' To compare the energy gain of one antenna with another, the amplitudes of Ir, 

 which are proportional to effective voltages, should be corrected for the differences in 

 radiation resistance of the antennas. 



