Summary
International Symposium on Antennas and Propagation
2010
Session Number:2WB1
Session:
Number:2WB1-4
Broadband Quadrifilar Helical Antennas
David C. Ni, Peter Chung, Ray Chen, C. W. Hsu,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
Quadrifilar Helical Antennas (QHA) have been used for the spacecraft-satellite communications because they can provide omni-directional radiation in a single hemisphere without requiring a ground plane [1]. Recently, QHA are also adopted in the applications of GPS handheld devices since the antenna radiation pattern can be tuned to cover the upper hemisphere equally in all azimuth directions and the lower hemisphere pattern can be diminished for reducing the interference of antenna noise. Furthermore the handheld devices are increasingly hosting multi-band applications, which drive the antenna design efforts toward integrating several antennas into a single one. In this paper, we adopt QHA as the base structure for designing broadband antennas. Due to the space constraints of the handheld devices, we adopt techniques such as capacitive matching for bandwidth and performance optimization.