Miniaturised design of coplanar waveguide-fed broadband circularly polarised slot antenna

Author

Kang Luo ; Bin Chen ; Yun Yi ; Yigang Wang

Author_Institution

Nat. Key Lab. on Electromagn. Environ. Effects & Electro-Opt. Eng., PLA Univ. of Sci. & Technol., Nanjing, China

Volume

9

Issue

11

fYear

2015

Firstpage

1200

Lastpage

1204

Abstract

A novel miniaturised design of broadband circularly polarised (CP) antenna using a coplanar waveguide feed is presented. To realise CP characteristic, a pair of inverted-L strips around two opposite corners of the slot is protruded. By properly folding the modified ground plane, the 3-dB axial-ratio (AR) band is shifted to around a lower-frequency location, whereas the input impedance band is shifted downwards through the Y-shaped loading strip. The overall size of the antenna is about 0.34 λ₀ × 0.34 λ₀ × 0.009 λ₀ at 1.7 GHz. Measured results show that the proposed design can deliver 3-dB AR bandwidth of 36.8% (1.55-2.25 GHz) and 10 dB impedance bandwidth of 63.2% (1.17-2.25 GHz).

Keywords

antenna feeds; broadband antennas; coplanar waveguides; polarisation; slot antennas; AR band; CP characteristic; axial-ratio band; bandwidth 1.17 GHz to 2.25 GHz; broadband circularly polarised antenna; coplanar waveguide feed; input Y-shaped loading strip; inverted-L strips; miniaturised design; modified ground plane;

fLanguage

English

Journal_Title

Microwaves, Antennas & Propagation, IET

Publisher

iet

ISSN

1751-8725

Type

jour

DOI

10.1049/iet-map.2014.0873

Filename

7214393