Abstract
The impedance and radiation pattern parameters of a /spl lambda//2 quadrifilar helix antenna (QHA) with turn angles in the range 0/spl deg/ to 235/spl deg/ are analyzed. It is shown that by selecting the helix turn angle to satisfy the minimum bandwidth and beamwidth requirements, an improved electrical performance and a reduction in the physical size of the antenna is obtained. This is demonstrated by comparing the performance of a conventional half turn QHA with structures having a smaller pitch length. The computed results are validated by experimental data at L-band.
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