Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/159431
Title: Compact broadband circularly-polarised directional universal GNSS antenna with symmetric radiation pattern and stable near-zenith coverage
Authors: Qiang Liu;Yong Li;Zhiguang Mo;Yuanan Liu
Year: 2017
Publisher: IET
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&x00B0; 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 (&x00B1;0.2) dB, and phase err 90&x00B0; (&x00B1;6&x00B0;), 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 &x00D7; 0.8 &x00D7; 0.09&x03BB;<sub>0</sub><sup>3</sup>. 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.
URI: http://localhost/handle/Hannan/159431
volume: 11
issue: 5
More Information: 657,
663
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7902037.pdf4.51 MBAdobe PDF
Title: Compact broadband circularly-polarised directional universal GNSS antenna with symmetric radiation pattern and stable near-zenith coverage
Authors: Qiang Liu;Yong Li;Zhiguang Mo;Yuanan Liu
Year: 2017
Publisher: IET
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&x00B0; 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 (&x00B1;0.2) dB, and phase err 90&x00B0; (&x00B1;6&x00B0;), 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 &x00D7; 0.8 &x00D7; 0.09&x03BB;<sub>0</sub><sup>3</sup>. 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.
URI: http://localhost/handle/Hannan/159431
volume: 11
issue: 5
More Information: 657,
663
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7902037.pdf4.51 MBAdobe PDF
Title: Compact broadband circularly-polarised directional universal GNSS antenna with symmetric radiation pattern and stable near-zenith coverage
Authors: Qiang Liu;Yong Li;Zhiguang Mo;Yuanan Liu
Year: 2017
Publisher: IET
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&x00B0; 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 (&x00B1;0.2) dB, and phase err 90&x00B0; (&x00B1;6&x00B0;), 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 &x00D7; 0.8 &x00D7; 0.09&x03BB;<sub>0</sub><sup>3</sup>. 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.
URI: http://localhost/handle/Hannan/159431
volume: 11
issue: 5
More Information: 657,
663
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7902037.pdf4.51 MBAdobe PDF