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Effect of helix turn angle on the performance of a half wavelength quadrifilar antenna

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2 Author(s)
M. Amin ; Inst. of Electron., Commun. & Inf. Technol., Queen's Univ., Belfast, UK ; R. Cahill

The impedance and radiation pattern parameters of a λ/2 quadrifilar helix antenna (QHA) with turn angles in the range 0° to 235° 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.

Published in:

IEEE Microwave and Wireless Components Letters  (Volume:16 ,  Issue: 6 )