Journal of Electrical and Computer Engineering Innovations (Jan 2017)

A Small Printed Quadrifilar Helical Antenna for BGAN/GPS Applications

  • R. Kazemi

DOI
https://doi.org/10.22061/jecei.2017.623
Journal volume & issue
Vol. 5, no. 1
pp. 7 – 11

Abstract

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This paper presents an element of a 2×2-element array antenna for Inmarsat BGAN/GPS applications. The element is an axial mode printed quadrifilar helical antenna that has been integrated with a compact feed network to provide sequential phase rotation for circular polarization (CP) radiation. The novel integrated lumped-element feed network is designed to provide a balanced RF power to the four helix arms with a 90° sequential phase difference between them. The design maintains a low cross polarization, and accordingly, a high quality of RHCP up to ±66° over the transmit frequency band of 1616 MHz to 1626 MHz. The gain in this frequency range is higher than 3.5 dB with a return loss better than 11 dB and a perfect circular polarization performance (axial ratio ~0 dB). The proposed antenna has small size, light weight, low cost, almost hemispherical radiation pattern and excellent circular polarization that can become a good candidate in satellite L1-band and BGAN satellite communications.

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