Four‐hundred gigahertz broadband multi‐branch waveguide coupler. Issue 11 (27th April 2020)

• Record Type: Journal Article
• Authors: Zhang, Bo; Niu, Zhongqian; Wang, Jiale; Ji, Dongfeng; Zhou, Tianchi; Liu, Yang; Feng, Yinian; Hu, Yi; Zhang, Jicong; Fan, Yong
• Is Part Of: IET microwaves, antennas & propagation. Volume 14:Issue 11(2020)
• Page Start: 1175
• Page End: 1179
• Publication Date: 2020-04-27
• Subjects: waveguide couplers -- submillimetre wave couplers; terahertz technology -- modified branches -- five‐branch hybrid coupler design -- seven‐branch hybrid coupler -- four‐hundred gigahertz broadband multibranch waveguide coupler -- HFSS software -- frequency 380.0 GHz to 460.0 GHz -- S23 -- S11; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2020.0090
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : Terahertz technology is a hotspot in the current academic research. In this study, a 400 GHz broadband multi‐branch waveguide hybrid coupler is designed, but it is very difficult to fabricate. In order to release the processing difficulty, a modified five‐branch hybrid coupler has also been designed, fabricated and measured. The hybrid coupler consists of five modified branches and has been optimised to a great performance, which increases the operation bandwidth. Compared to the traditional five‐branch hybrid coupler design, this structure has a wider operation bandwidth and the bandwidth is almost the same as traditional seven‐branch hybrid coupler. Based on this model, the performance of the coupler is optimised by HFSS software. The measurement results show good performance that >18 dB return loss ( S 11 ) and isolation ( S 23 ), 90° ± 2° phase difference and 0.3 dB amplitude imbalance are obtained in the frequency range of 380–460 GHz, agreeing well with the simulation results.