Optimal Design of THz NRD Rat-Race Circuit Using Function Expansion Based Topology Optimization Method With CMA-ES
| Autor: | Md. Iquebal Hossain Patwary, Tahir Bashir, Akito Iguchi, Yasuhide Tsuji |
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| Jazyk: | angličtina |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | IEEE Photonics Journal, Vol 16, Iss 4, Pp 1-12 (2024) |
| Druh dokumentu: | article |
| ISSN: | 1943-0655 85502847 |
| DOI: | 10.1109/JPHOT.2024.3411115 |
| Popis: | Rat-race circuit devices are crucial components in the design of THz-wave circuits. Although nonradiative dielectric (NRD) waveguides having simple structures and extremely low loss are promising platforms for THz-wave circuits, it may difficult to realize conventional rat-race devices in NRD platform due to the appearance of unwanted LSE$_{01}$ mode in the output ports. Therefore, optimal design of these devices is very essential for THz-wave circuit applications. In this paper, we present topology optimal design of THz NRD rat-race circuit based on function expansion method and covariance matrix adaptation evolution strategy (CMA-ES). The proposed method overcomes the difficulty of appearing unwanted LSE$_{01}$ mode in the output ports, thus the optimized devices achieved the significant improvement in the device performance in comparison with that of conventional NRD rat-race devices. In addition to the NRD rat-race circuit, a 90$^{\circ }$ hybrid device is also designed in order to confirm the validity of the proposed design approach. A thorough discussion of the fabrication tolerance of proposed devices has also been conducted in detail. |
| Databáze: | Directory of Open Access Journals |
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