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BELL SYSTEM TECHNICAL JOURNAL 



were used with no alteration whatever in the antenna, its termination, 

 or its transmission Hne coupling circuits. The standard of comparison, 

 however, was always a half wave-length for the signal under test. It 

 has been thought desirable to plot the gain data as the percentage of 

 total time the antenna gain was above the indicated value in order to 

 show the gain distribution with time. This summary of gains is given in 

 Fig. 23. 



24 



22 



20 



a 16 



z 



O 12 



O 10 



10 20 30 40 50 60 70 80 90 100 

 PER CENT OF TOTAL TIME ABOVE GAIN INDICATED 



Fig. 23- — -Gain-time distribution curves. 



I am indebted to a member ^ of our laboratories for an interesting 

 variation which has been used in the application of this type of antenna 

 to the transmitting problem. A simple terminating resistance is often 

 undesirable in the transmitting case since it may be called upon to dis- 

 sipate several kilowatts, in fact, that portion of the energy which would 

 be radiated backward if no terminating resistance were employed. A 

 long, two-wire iron transmission line shorted at the far end has been 

 found to be one useful terminating load of the required dissipating 

 ability. 



The terminated diamond-shaped antenna possesses a broad im- 

 pedance-frequency characteristic. This property may be augmented 



^ E. J. Sterba, Bell Telephone Laboratories. 



