Journal
IET MICROWAVES ANTENNAS & PROPAGATION
Volume 14, Issue 11, Pages 1175-1179Publisher
WILEY
DOI: 10.1049/iet-map.2020.0090
Keywords
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; S-23; S-11
Funding
- National Key RAMP
- D Program of China [2018YFF0109702]
- National Natural Science Foundation of China [61771116, 91738102]
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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 degrees +/- 2 degrees phase difference and 0.3 dB amplitude imbalance are obtained in the frequency range of 380-460 GHz, agreeing well with the simulation results.
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