Simplified analytical procedure for four-element nonuniformly spaced arrays

S.D. Roy
1980 IRE Transactions on Antennas and Propagation  
A simplified analytical procedure is suggested for the design of a four-element symmetrical uniformly excited nonunifody spared linear antenna array. The errors resulting from the simplification are shown to be negligible for sidelobes of practical significance. Abstract-The measured voltage standing wave ratio (VSWR), gain, pattern, and axial ratio characteristics of a uniformly wound helical antenna are presented. Experimental parametric studies were made of 1) fixed length hel i ces with
more » ... hel i ces with variable diameter and pitch angle (8.6 to 10 turns), and 2) variable length helices with constant diameter and pitch angle (5 to 35 turns). Parametric curves are presented to show the gain and half-power beamwidth (HPBW) of a constant pitch helix as a function of axial length L/h and circumference CM-Empirical expressions are derived for the antenna peak gain and bandwidth as a bction of the helix parameten. In addition, the antenna gain-beamwidth products are examined.
doi:10.1109/tap.1980.1142324 fatcat:u3fpnksikbfxzarc7se5rbbz6a