Synthesis and Design of Dual-Bandpass Frequency Selective Surface Based on Resonant Elements

Thong, Wen Jie (2025) Synthesis and Design of Dual-Bandpass Frequency Selective Surface Based on Resonant Elements. Final Year Project (Bachelor), Tunku Abdul Rahman University of Management and Technology.

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Abstract

This project presents the synthesis and design of a dual-bandpass Frequency Selective Surface (FSS) based on resonant elements for 5G communication applications. The motivation for designing a dual-bandpass filter lies in its ability to increase channel capacity, enabling the transmission of more signals and data within the same frequency spectrum. The selected frequency bands, 2.4 GHz and 5 GHz, fall within the mid-band range (1-6 GHz) widely adopted in current 5G networks, offering an optimal balance between coverage and data rate. However, existing dual-band FSS designs often lack a deterministic or systematic synthesis approach, making higher-order filter design and substrate adaptability difficult. To address this, a structured synthesis method is adopted, starting from a standard low-pass filter prototype and applying frequency transformations to achieve the desired dual-bandpass response. Circuit modeling is performed in Advanced Design System (ADS) to establish the equivalent resonant circuit, followed by full-wave electromagnetic simulation in CST Studio Suite for physical validation. The results from both simulations show partial agreement, with both models demonstrating dual-band characteristics but exhibiting differences in bandwidth and resonance depth. These variations are attributed to coupling and parasitic effects in the full-wave model. Although full optimization was limited by time constraints, the study successfully demonstrates the relationship between circuit parameters, geometric structure, and frequency response, providing a systematic foundation for future dual-band FSS development