Characterization of multiple log-periodic array antennas for surveillance systems using a novel array-factor

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dc.contributor.authorOkoye, Arinze Christian
dc.date.accessioned2026-04-11T08:09:59Z
dc.date.available2026-04-11T08:09:59Z
dc.date.issued2023-11
dc.descriptionThis thesis is for the award of Doctor of Philosophy (PhD.) Degree in Electrical/Electronics Engineering (Telecommunication Engineering option)
dc.description.abstractThis research endeavors to comprehensively characterize Multiple Log-Periodic Array (MLPA) antennas, specifically in the context of surveillance systems, using a novel array factor. This array factor streamlines the numerical characterization of MLPA antennas, regardless of the number of elements involved. The study employs a rigorous analytical approach, incorporating the Magnetic Vector Potential (MVP) model and pattern multiplication approach through a top-down methodology. The MVP model was chosen for its auxiliary function, which greatly simplifies the analytical processes. In practical terms, experimental Multiple Log Periodic Array antennas were designed and evaluated for this study. The parameters of these antennas were numerically assessed in the far field using the newly developed Array Factor. MatLab R2010a software played a pivotal role in simulating various parameters of the Multiple Log-Periodic Array antennas, including Array Antenna patterns, Electric/Magnetic fields, Average Poynting Vector, Radiation Intensity, Radiated Power, Directivity, and Directive Gain. The results demonstrated that the array antennas had a Directivity/Gain of 15.68dB or 45.68dBm, at the operating frequency range of 1.350GHz to 2.690GHz. The collective array patterns generated by the MLPA antennas were in line with expectations, relying on the corresponding field of single element. Multiple Log-Periodic Array antennas expanded the function of Single Log-Periodic Array (SLPA) antennas by significantly enhancing radiation gain and signal coverage. Thus, the novel Array Factor accelerates the process of characterizing array antenna parameters, thereby alleviating the bottleneck in computing antenna losses. This marks a significant advancement in the field of antenna technology.
dc.identifier.citationOkoye, A. C. (2023). Characterization of multiple log-periodic array antennas for surveillance systems using a novel array-factor [ Unpublished Phd. Thesis]. Federal University of Technology, Owerri, Nigeria
dc.identifier.urihttps://repository.futo.edu.ng/handle/20.500.14562/2631
dc.language.isoen
dc.publisherFederal University of Technlogy, Owerri
dc.rightsAttribution-NonCommercial-ShareAlike 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/
dc.subjectArray antennas
dc.subjectarray factor
dc.subjectlog periodic antenna (LPA))
dc.subjectsurveillance systems
dc.subjectelectromagnetic waves
dc.subjectmagnetic vector potential (MVP))
dc.subjectwire antennas
dc.subjectfrequency independent antennas
dc.subjectDepartment of Electrical Electronic Engineering
dc.titleCharacterization of multiple log-periodic array antennas for surveillance systems using a novel array-factor
dc.typeDoctoral Thesis

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