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- Title
Compact broadband circularly-polarised directional universal GNSS antenna with symmetric radiation pattern and stable nearzenith coverage.
- Authors
Qiang Liu; Yong Li; Zhiguang Mo; Yuanan Liu
- Abstract
Circularly-polarised (CP) antennas are widely used in global navigation satellite system (GNSS). In this study, a compact broadband CP directional antenna comprises a circular radiating patch, four coupled semi-sector-annulus sheets, and a novel compact broadband four-feed circuit is presented. In combination of the out-of-phase power splitter, coupled-line power dividers, and broadband phase shifters, the four-feed circuit characterises consistent 90° phase shift sequentially on the four equal output signals. The bandwidth of the four-feed circuit is 104.8% for 10-dB return loss (RL), output magnitude distribution -6.5 (±0.2) dB, and phase err 90° (±6°), which provides the antenna with high-precision feed signals. Measured results show that the antenna achieves CP bandwidth of 75.8% from 1.13 to 2.51 GHz for RL better than 10 dB, axial ratio lower than 3 dB, and gain variation less than 3 dB. Performance contrast shows that the design provides the widest CP bandwidth and small volume of 0.7 × 0.8 × 0.09λ03. Moreover, the antenna exhibits considerably symmetric patterns and stable near-zenith coverage in the whole CP band. Therefore, the proposed antenna is well suited to universal GNSS applications, especially when receivers operate in street canyons and mountainous area.
- Subjects
BROADBAND communication systems; GLOBAL Positioning System; ANTENNA radiation patterns; ELECTRIC circuit design &; construction; BANDWIDTHS
- Publication
IET Microwaves, Antennas & Propagation (Wiley-Blackwell), 2017, Vol 11, Issue 5, p657
- ISSN
1751-8725
- Publication type
Article
- DOI
10.1049/iet-map.2016.0815