Design of dual-polarised (RHCP/LHCP) quad-ridged horn antenna with wideband septum polariser waveguide feed

作者：Jazani Ghoncheh^*; Pirhadi Abbas

来源：IET Microwaves Antennas & Propagation, 2018, 12(9): 1541-1545.

DOI：10.1049/iet-map.2017.0611

• horn antennas
• antenna radiation patterns
• antenna feeds
• electromagnetic wave polarisation
• waveguides
• dual polarisation characteristics
• wideband characteristics
• waveguide transition
• square waveguide
• dual polarisation
• wide bandwidth
• waveguide structure
• feeding network
• LHCP
• RHCP
• left-hand circular polarisation
• right-hand circular polarisation
• wideband septum polariser waveguide feed
• dual-polarised quad-ridged horn antenna

This study was conducted to design a wideband septum polariser as a feeder of the antenna to generate right-hand circular polarisation (RHCP) and left-hand circular polarisation (LHCP) concurrently. The proposed septum polariser overcomes the conventional bandwidth limit and covers 40% bandwidth from 8 to 12GHz. Moreover, a quad-ridged horn is chosen as a radiator of the feeding network due to its waveguide structure, wide bandwidth, and dual polarisation. Therefore, the proposed structure consists of a quad-ridged horn fed by a square waveguide, a waveguide transition, and a wideband septum polariser. The final design has an axial ratio <1.5dB over the X-band. This configuration can be used as a feed for reflector antennas due to the wideband and dual polarisation characteristics. Furthermore, the structure is highly recommended for high-power applications because of its waveguide feature.

• 出版日期2018-7-25