Wideband dual-mode planar endfire antenna with circular polarisation

• Published in: Electronics letters Vol. 52; no. 12; pp. 1000 - 1001
• Main Authors: Zhang, Ji, Lu, Wen-Jun, Li, Ling, Zhu, Lei, Zhu, Hong-bo
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 09.06.2016
• Subjects: annular sector dipole; Antennas and propagation; broadband antennas; circular polarisation; dipole antennas; multifrequency antennas; planar antennas; semicircular disk radiator; stub loaded annular sector dipole; wideband dual mode planar endfire antenna; wideband dual mode planar endfire antenna; stub loaded annular sector dipole; annular sector dipole; multifrequency antennas; broadband antennas; dipole antennas; semicircular disk radiator; planar antennas; circular polarisation
• ISSN: 0013-5194; 1350-911X; 1350-911X
• DOI: 10.1049/el.2016.0936

A novel wideband dual-mode planar endfire antenna with circular polarisation is presented. The antenna consists of a semicircular disk radiator and a concentrically, stub-loaded annular sector dipole. A pair of stubs is symmetrically loaded along the annular sector dipole so that the second odd-order dipole mode is excited and moved downwards to the fundamental mode. Thus, a wideband, planar endfire circularly polarised antenna with dual-resonant characteristic is achieved. It is shown that the prototype has an impedance bandwidth of more than 24.8%, and a 3 dB axial ratio bandwidth of 18.8%.