484 



BELL SYSTEM TECHNICAL JOURNAL 

 Experimental Results 



There follows a tabulation of some experimental data on samples of the 

 specific series types analyzed. The attenuation figures are probably good 

 to zb .25 db up to 10 db, to ± .5 db up to 50 db. The SWR figures may not 

 be better than d= .2 db. 



,^'^'»i 





Fig. 8 — \]/2 X ring — 4 arm — photograph of machined test sample. 



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Fig. 9a— 1^ X ring— 3 arm— as power divider. 

 Y\g. 9b — 13^ X ring — 4 arm — as power divider and null device. 



The data are for structures built in terms of .900 inch by .400 inch rec- 

 tangular guide size (inside) and the test wavelengths* are in the 3-centimeter 

 region. The design wavelength* is Xo , the test wavelength X*. 

 Case A: IJX; Three Arms; Impedance Match ■\/2Z = Zo ; Reference 

 Fig. 9a: 



* These are space wavelengths. 



