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The 15th Scientific day : Bridging Science, Engineering, Technology & Industry for Cambodia's Growth
Published: July 31,2026Comparison Analysis of Deep Learning and Tree-Based Homogeneous Ensemble Learning Predictive Models on the KHR/USD Daily Official Exchange Rate
Published: July 31,2026Comparing Time Series, Machine Learning, and Deep Learning Models for Paddy Rice Price Forecasting in Battambang Province, Cambodia
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Published: July 31,2026A Computational Approach to Labor Market Analytics: Analyzing Skill Trends in Cambodia Using an LLM-Based Pipeline
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Published: July 31,2026Design of Multi-Layer Planar Electromagnetic Wave Absorber Using 1D-FDTD Integrated with ASA and Gradient Descent Optimization Method
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1. Research Unit of Mechatronic and Information Technology, Institute of Technology of Cambodia, Russian Federation Blvd., P.O. Box 86, Phnom Penh, Cambodia
Academic Editor:
Received: August 16,2023 / Revised: / Accepted: October 23,2023 / Available online: June 30,2024
In this paper, an adjoint sensitivity analysis with an iterative first-order gradient descent optimization technique is proposed in conjunction with the finite-difference time-domain (FDTD) method to design a broadband multi-layer planar electromagnetic wave absorber made of expanded polystyrene mixed with graphite powder. This analysis needs an additional adjoint field simulation for the sensitivity calculation of design parameters (thickness and density of absorbing materials), which can be computed by the FDTD technique with the backward time scheme. The result obtained from the proposed design method is compared with the point frequency matching method. A smaller thickness, carbon content, and better absorption performance of a multi-layer planar absorber are obtained over the frequency range of 0.4-5 GHz.