Low‐profile circularly polarised patch antenna with high gain and conical beam. Issue 7 (12th March 2018)

• Record Type: Journal Article
• Authors: Xu, Hengfei; Zhou, Jianyi; Zhou, Ke; Yu, Zhiqiang
• Is Part Of: IET microwaves, antennas & propagation. Volume 12:Issue 7(2018)
• Page Start: 1191
• Page End: 1195
• Publication Date: 2018-03-12
• Subjects: antenna radiation patterns -- microstrip antennas -- electromagnetic wave polarisation -- antenna feeds; low‐profile circularly polarised patch antenna -- low‐profile CP antenna -- monopolar patch antenna -- ring‐shaped array -- modified parasitic patch elements -- resonant modes -- ground plane -- conductive shorting vias -- impedance bandwidth -- CP conical‐beam radiation pattern -- loop current -- slot resonant mode -- design concept illustration -- axial ratio bandwidth; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2017.0928
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : A low‐profile circularly polarised (CP) antenna with conical‐beam radiation pattern is presented. The proposed antenna consists of a monopolar patch antenna fed by a probe in the centre and a ring‐shaped array formed by eight modified parasitic patch elements. Two resonant modes of the monopolar patch which connects to a ground plane by a set of conductive shorting vias are utilised to achieve wide impedance bandwidth. A CP conical‐beam radiation pattern is formed by loading the designed array. Loop current and slot resonant mode are employed to discuss the operating principle. A parametric study is carried out for the detailed design concept illustration. To verify the design, a prototype has been fabricated and measured, which shows a low profile of 0.059 λ 0, a maximum gain of 7.45 dBic, a 10‐dB impedance bandwidth of 23.1%, a 3‐dB axial ratio bandwidth of 9.6% and a good conical‐beam radiation pattern.