Optimal Design of THz NRD Rat-Race Circuit Using Function Expansion Based Topology Optimization Method With CMA-ES

Optimal Design of THz NRD Rat-Race Circuit Using Function Expansion Based Topology Optimization Method With CMA-ES

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 platfo...

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Bibliographic Details
Main Authors: Md. Iquebal Hossain Patwary, Tahir Bashir, Akito Iguchi, Yasuhide Tsuji
Format: Article
Language:English
Published: IEEE 2024-01-01
Series:IEEE Photonics Journal
Subjects:
Nonradiative dielectric (NRD) waveguide
rat-race circuit
90<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX">$^{\circ }$</tex-math> </inline-formula> </named-content> hybrid device
topology optimization
function expansion method
covariance matrix adaptation evolution strategy (CMA-ES)
Online Access:https://ieeexplore.ieee.org/document/10552049/
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Summary: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<inline-formula><tex-math notation="LaTeX">$_{01}$</tex-math></inline-formula> 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<inline-formula><tex-math notation="LaTeX">$_{01}$</tex-math></inline-formula> 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<inline-formula><tex-math notation="LaTeX">$^{\circ }$</tex-math></inline-formula> 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.
ISSN:1943-0655

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