Analysis of phased array antenna system via spherical harmonics decomposition

Famoriji, Oluwole John; Akingbade, Kayode; Ogunti, Erastus O.; Apena, Waliu Olalekan; Fadamiro, Akinwale O.; Lin, Fujiang

doi:10.1049/iet-com.2018.5460

Cited by 7 publications

(10 citation statements)

References 21 publications

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“…The antenna is excited with TM z 11 mode [13,14]. The zeros X ij of the derivative Bessel function J m (x) determine the order of resonating frequencies.…”

Section: Antenna Design Proceduresmentioning

confidence: 99%

“…The degree of inappropriateness in the spatial aliasing, antenna positioning, and measurement noise are assessed by the analysis of spherical antenna array via spherical harmonics decomposition using Gaussian, equiangular, and uniform spatial sampling techniques for the antenna array elements positioning on a sphere [14].…”

Section: Introductionmentioning

confidence: 99%

“…Patch antennas have been gaining importance in electromagnetic devices owing to useful features such as simplicity of fabrication, low cost, minimal weight, and negligible body effect [14,15]. However, one area that these antennas lack is bandwidth enhancement for practical applications.…”

Section: Introductionmentioning

confidence: 99%

“…The quality factor in turn depends on substrate parameters such as dielectric constant, ε r and substrate thickness, via inverse and direct relation, respectively [16]. The effect of increasing the thickness of the substrate and lowering dielectric constant, ε r leads to an increase in surface wave power levels which result in poor radiation efficiency [14].…”

Section: Introductionmentioning

confidence: 99%

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Design of Hemispherical Patch Antenna With Conformally Spaced Log-Periodic Elements for Multi-Directional and Multi-Band Operation

Prasad¹,

Gowda²,

Indira³

et al. 2022

PIER C

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In this paper, the design of an Ultra Wide Band (UWB) hemispherical antenna with Log-Periodic Elements (LPEs) capable of operating at multiple resonating frequencies lying in L, S, C, X, and Ku frequency bands is presented. The design consists of a complex structure of silver hemisphere with LPE mounted on an FR-4 substrate fed by a 50 Ω microstrip line. The dependency of the inclination of log-periodic elements mounted on the hemisphere is analyzed with parametric study. The proposed miniaturized antenna uses LPEs to obtain an impedance bandwidth of above 100% and a multidirectional radiation pattern. The measured results show that a wide operating band of 12.63 GHz (1.68 GHz-14.31 GHz) (8.52 : 1) has been achieved with a multi-directional radiation pattern with a peak realized gain of 8.12 dBi.

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“…The antenna is excited with TM z 11 mode [13,14]. The zeros X ij of the derivative Bessel function J m (x) determine the order of resonating frequencies.…”

Section: Antenna Design Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of Hemispherical Patch Antenna With Conformally Spaced Log-Periodic Elements for Multi-Directional and Multi-Band Operation

Prasad¹,

Gowda²,

Indira³

et al. 2022

PIER C

View full text Add to dashboard Cite

show abstract

“…Multiple EM signal localization within the proximity of antenna array has been dealt with in the literature. Most works considered the sources that are in far-field (FF) of the array [8][9][10]. However, this paper focuses on sources that are in the near-field (NF) of SAA; in this case, it will be possible to estimate DoA and range of the source.…”

Section: Introductionmentioning

confidence: 99%

Source Localization of EM Waves in the Near‐Field of Spherical Antenna Array in the Presence of Unknown Mutual Coupling

Famoriji

Shongwe

2021

Wireless Communications and Mobile Computing

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To obtain an antenna array with isotropic radiation, spherical antenna array (SAA) is the right array configuration. The challenges of locating signals transmitted within the proximity of antenna array have been investigated considerably in the literature. However, near-field (NF) source localization of signals has hitherto not been investigated effectively using SAA in the presence of mutual coupling (MC). MC is another critical problem in antenna arrays. This paper presents an NF range and direction-of-arrival (DoA) estimation technique via the direction-independent and signal invariant spherical harmonics (SH) characteristics in the presence of mutual coupling. The energy of electromagnetic (EM) signal on the surface of SAA is captured successfully using a proposed pressure interpolation approach. The DoA estimation within the NF region is then calculated via the distribution of pressure. The direction-independent and signal invariant characteristics, which are SH features, are obtained using the DoA estimates in the NF region. We equally proposed a learning scheme that uses the source activity detection and convolutional neural network (CNN) to estimate the range of the NF source via the direction-independent and signal invariant features. Considering the MC problem and using the DoA estimates, an accurate spectrum peak in the multipath situation in conjunction with MC and a sharper spectrum peak from a unique MC structure and smoothing algorithms are obtained. For ground truth performance evaluation of the SH features within the context of NF localization, a numerical experiment is conducted and measured data were used for analysis to incorporate the MC and consequently computed the root mean square error (RMSE) of the source range and NF DoA estimate. The results obtained from numerical experiments and measured data indicate the validity and effectiveness of the proposed approach. In addition, these results are motivating enough for the deployment of the proposed method in practical applications.

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Antenna Feed Array Synthesis for Efficient Communication Systems

Famoriji¹,

Xu²

2020

IEEE Sensors J.

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Analysis of phased array antenna system via spherical harmonics decomposition

Cited by 7 publications

References 21 publications

Design of Hemispherical Patch Antenna With Conformally Spaced Log-Periodic Elements for Multi-Directional and Multi-Band Operation

Design of Hemispherical Patch Antenna With Conformally Spaced Log-Periodic Elements for Multi-Directional and Multi-Band Operation

Source Localization of EM Waves in the Near‐Field of Spherical Antenna Array in the Presence of Unknown Mutual Coupling

Antenna Feed Array Synthesis for Efficient Communication Systems

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