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Generation of OAM Waves and Analysis of Mode Purity for 5G Sub-6 GHz Applications

Computers, Materials & Continua 2023年第1期74卷 2239-2259页

作者： Shehab Khan Noor Arif Mawardi Ismail Mohd Najib Mohd Yasin Mohamed Nasrun Osman nurulazlina ramli Ali H.Rambe J.Iqbal Advanced Communication Engineering(ACE) Centre of ExcellenceFaculty of Electronic Engineering TechnologyUniversiti Malaysia PerlisKangarPerlisMalaysia Centre for Advanced Electrical&Electronic System(CAEES)Faculty of Engineering Built Environment and Information TechnologySEGi University Petaling JayaSelangorMalaysia Department of Electrical Engineering Universitas Sumatera UtaraMedan20155Indonesia School of Electrical and Electronic Engineering Engineering CampusUniversiti Sains MalaysiaNibong Tebal14300PenangMalaysia Faculty of Engineering&Technology Gomal University29050 kpkPakistan

This article presents the generation of Orbital AngularMomentum(OAM)vortex waves with mode 1 using Uniform Circular Array(UCA)*** different designs,namely,UCA-1(4-element array antenna)and UCA-2(8-element array antenna),were designed and fabricated using FR-4 substrate to generate OAM mode 1 at 3.5 GHz(5G mid-band).The proposed antenna arrays comprised rectangular microstrip patch elements with inset fed *** elements were excited by a carefully designed feeding phase shift network to provide similar output energy at output ports with desired phase shift *** generated OAM waves were confirmed by measuring the null in the bore sight of their 2D radiation patterns,simulated phase distribution and intensity *** measurement results agree well with the simulation ***,a detailed mode purity analysis of the generated OAM waves was carried out considering different *** investigation found that the greater the number of elements,the higher the purity of the generated OAM *** with other previous works,the proposed antenna design of this paper is very simple to design and *** addition,the proposed antennas are compact in design even at lower frequency band with very wide bandwidth to meet the requirements of 5G mid-band applications.

关键词： Orbital angular momentum vortex waves fifth generation wireless communications uniform circular array antenna patch antenna

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Higher Order OAM Mode Generation Using Wearable Antenna for 5G NR Bands

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Computer Systems Science & Engineering 2023年第10期47卷 537-551页

作者： Shehab Khan Noor Arif Mawardi Ismail Mohd Najib Mohd Yasin Mohamed Nasrun Osman Thennarasan Sabapathy Shakhirul Mat Salleh Ping Jack Soh Ali Hanafiah Rambe nurulazlina ramli Advanced Communication Engineering(ACE) Centre of ExcellenceFaculty of Electronic Engineering&TechnologyUniversiti Malaysia PerlisKangarPerlisMalaysia Faculty of Engineering Technology(FTK) Department of Electronic Engineering TechnologyUniversiti Malaysia Perlis(UniMAP)Unicity Alam Campus02100Padang BesarPerlisMalaysia Centre for Wireless Communications(CWC) University of Oulu90570OuluFinland Department of Electrical Engineering Universitas Sumatera UtaraMedan20155Indonesia Centre for Advanced Electrical and Electronic System(CAEES)Faculty of Engineering Built Environment and Information TechnologySEGi University SelangorMalaysia

This paper presents a flexible and wearable textile array antenna designed to generate Orbital Angular Momentum(OAM)waves with Mode+2 at 3.5 GHz(3.4 to 3.6 GHz)of the sub-6 GHz fifth-generation(5G)New Radio(NR)*** proposed antenna is based on a uniform circular array of eight microstrip patch antennas on a felt textile *** contrast to previous works involving the use of rigid substrates to generate OAM waves,this work explored the use of flexible substrates to generate OAM waves for the first *** than that,the proposed antenna was simulated,analyzed,fabricated,and tested to confirm the generation of OAMMode+*** the same design,OAM Mode−2 can be generated readily simply by mirror imaging the feed *** that the proposed antenna operated at the desired frequency of 3.5 GHz with an overall bandwidth of 400 MHz in free ***,mode purity analysis is carried out to verify the generation of OAM Mode+2,and the purity obtained was 41.78%at free space flat ***,the effect of antenna bending on the purity of the generated OAM mode is also ***,the influence of textile properties on OAM modes is examined to assist future researchers in choosing suitable fabrics to design flexible OAM-based *** a comprehensive analysis considering different factors related to wearable applications,this paper demonstrates the feasibility of generating OAMwaves using textile ***,as per the obtained Specific Absorption Rate(SAR),it is found that the proposed antenna is safe to be *** findings of this work have a significant implication for body-centric communications.

关键词： Wearable antenna OAM vortex waves 5G textile antenna microstrip patch antenna specific absorption rate(SAR)

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