HORIZONTAL RHOMBIC ANTENNAS 

 Substituting (6) into (8) gives 



// X /-sin A 



, livH . ^ \ lir sin A / tt/ . , . 



tan ( — — sin A I tan ( — sin^ A 



145 



(14) 



When both A and // are specified, this equation gives the element 

 length I to be used with the reduced height. Figures 9 and 10 are 



ANGLE IN DEGREES 

 90 80 70 60 50 40 



RELATIVE RECEIVER CURRENT 



Fig. 9 — Compromise height design. Receiver current diagram of incident plane 

 directivity for a 17.5° wave-angle and a height of one-half wave-length. 



Fig. 10 — Compromise height design. Receiver current versus azimuth angle for a 

 17.5° wave-angle and a height of one-half wave-length. 



examples of the directive diagrams resulting from a reduced height of 

 one-half wave-length and an incident wave-angle of 17.5 degrees. 

 These last mentioned figures may be directly compared with Figs. 5 



