Date of Award

6-2026

Degree Name

MS in Electrical Engineering

Department/Program

Electrical Engineering

College

College of Engineering

Advisor

Payam Nayeri

Advisor Department

Electrical Engineering

Advisor College

College of Engineering

Abstract

This thesis presents the design and analysis of a Reconfigurable Intelligent Surface (RIS) for enhancing indoor wireless coverage in the Personal Communication Service band, which ranges from 1850 MHz to 1995 MHz. Indoor cellular networks commonly rely on Distributed Antenna System (DAS) networks, but building materials and structural obstructions often result in coverage gaps. RIS technology provides a passive approach to enhancing propagation by controlling the reflection and redirection of electromagnetic waves. In this work, a RIS array is designed and modeled using full-wave electromagnetic simulation. The proposed array operates at a center frequency of 1925 MHz with a bandwidth of 150 MHz an consists of 100 elements arranged in a 10 × 10 configuration. Each element is implemented with an aperturecoupled patch antenna dimensioned at 50mm × 50mm. Beam steering is modeled through discrete phase control, and the system is evaluated using fixed phase delay lines to assess achievable radiation patterns and steering performance. These frozen state models were created to simulate a RIS panel redirecting a 45° oblique signal to directly broadside at 0°and at a declination from broadside at 45°. Results demonstrate that the proposed RIS design can effectively redirect incident energy and enable beam redirection in the PCS spectrum, supporting its use as a practical tool for mitigating indoor coverage limitations in DAS-assisted environments. Importantly, it demonstrates that such a unit cell topology can cover the desired bandwidth of 150 MHz, fully encompassing the PCS band.

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