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Beamforming Characterization of a Millimeter-Wave Reconfigurable Intelligent Surface.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Beamforming Characterization of a Millimeter-Wave Reconfigurable Intelligent Surface.
Author:	Tjahjadi, Brian.
Published:	Ann Arbor : ProQuest Dissertations & Theses, 2022
Description:	77 p.
Notes:	Source: Masters Abstracts International, Volume: 84-02.
Notes:	Advisor: Trichopoulos, Georgios C.
Contained By:	Masters Abstracts International84-02.
Subject:	Electrical engineering.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29324327
ISBN:	9798841777359

Beamforming Characterization of a Millimeter-Wave Reconfigurable Intelligent Surface.
Tjahjadi, Brian.

Beamforming Characterization of a Millimeter-Wave Reconfigurable Intelligent Surface. - Ann Arbor : ProQuest Dissertations & Theses, 2022 - 77 p.

Source: Masters Abstracts International, Volume: 84-02.

Thesis (M.S.)--Arizona State University, 2022.

This item must not be sold to any third party vendors.

The reconfigurable intelligent surface (RIS) shown in this work is a programmable metasurface integrated with a dedicated microcontroller that redirects an impinging signal to the desired direction. Its characteristic allows the RIS to act as a mirror for microwave signals. Unlike a perfect electric conductor (PEC), the RIS has much more flexibility in redirecting signals. This work involves the measurement of a passive, fixed beam, 25x32 element mmWave RIS that operates at 28.5 GHz. Bistatic and monostatic measurement setups are both used to find the radar cross section (RCS) of the RIS. The process of creating the measurement setups and the final measurement results is discussed. The measurement setup is further characterized using the High-Frequency Structure Simulator (HFSS) software and the final measurement results are compared to analytical solutions computed using MATLAB.The first prototype of the RIS has a loss of 8.4 dB when compared to a PEC and is physically curved. There is also a side lobe at the boresight of the RIS board that is only 8 dB less than the main beam in best-case scenario. This curvature causes issues with the monostatic measurement because it changes the phase that arrives at the RIS. The second prototype of the RIS has only 5.84 dB of loss compared to PEC. This measurement setup behaves mostly as expected when comparing the measurement results to the analytical solutions and given the limitations of the setup. A collimating lens was used as a part of the setup which reflects part of the incoming signal. The edge of the lens also causes diffraction. These factors contribute to multipath interference arriving at the receive antenna and increases measurement error. The lens also creates unequal amplitude illumination across the surface of the RIS which changes the RCS pattern. Using the lens allows a more space-efficient setup while still obtaining relatively constant phase illuminating across the RIS board.

ISBN: 9798841777359Subjects--Topical Terms:

454503
Electrical engineering.
Subjects--Index Terms:

Measurement

Beamforming Characterization of a Millimeter-Wave Reconfigurable Intelligent Surface.
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020 $a 9798841777359
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100 1 $a Tjahjadi, Brian. $3 942537
245 1 0 $a Beamforming Characterization of a Millimeter-Wave Reconfigurable Intelligent Surface.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2022
300 $a 77 p.
500 $a Source: Masters Abstracts International, Volume: 84-02.
500 $a Advisor: Trichopoulos, Georgios C.
502 $a Thesis (M.S.)--Arizona State University, 2022.
506 $a This item must not be sold to any third party vendors.
520 $a The reconfigurable intelligent surface (RIS) shown in this work is a programmable metasurface integrated with a dedicated microcontroller that redirects an impinging signal to the desired direction. Its characteristic allows the RIS to act as a mirror for microwave signals. Unlike a perfect electric conductor (PEC), the RIS has much more flexibility in redirecting signals. This work involves the measurement of a passive, fixed beam, 25x32 element mmWave RIS that operates at 28.5 GHz. Bistatic and monostatic measurement setups are both used to find the radar cross section (RCS) of the RIS. The process of creating the measurement setups and the final measurement results is discussed. The measurement setup is further characterized using the High-Frequency Structure Simulator (HFSS) software and the final measurement results are compared to analytical solutions computed using MATLAB.The first prototype of the RIS has a loss of 8.4 dB when compared to a PEC and is physically curved. There is also a side lobe at the boresight of the RIS board that is only 8 dB less than the main beam in best-case scenario. This curvature causes issues with the monostatic measurement because it changes the phase that arrives at the RIS. The second prototype of the RIS has only 5.84 dB of loss compared to PEC. This measurement setup behaves mostly as expected when comparing the measurement results to the analytical solutions and given the limitations of the setup. A collimating lens was used as a part of the setup which reflects part of the incoming signal. The edge of the lens also causes diffraction. These factors contribute to multipath interference arriving at the receive antenna and increases measurement error. The lens also creates unequal amplitude illumination across the surface of the RIS which changes the RCS pattern. Using the lens allows a more space-efficient setup while still obtaining relatively constant phase illuminating across the RIS board.
590 $a School code: 0010.
650 4 $a Electrical engineering. $3 454503
650 4 $a Computer engineering. $3 212944
650 4 $a Computer science. $3 199325
653 $a Measurement
653 $a Millimeter-wave
653 $a Reconfigurable intelligent surface
690 $a 0544
690 $a 0984
690 $a 0464
690 $a 0800
710 2 $a Arizona State University. $b Electrical Engineering. $3 708713
773 0 $t Masters Abstracts International $g 84-02.
790 $a 0010
791 $a M.S.
792 $a 2022
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29324327