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Impact of antenna pattern directivity on near-field focusing of planar array in large intelligent surface applications

Li, Jiawang LU orcid and Lau, Buon Kiong LU (2025) 2025 IEEE International Symposium on Antennas & Propagation and North American Radio Science Meeting
Abstract
Near-field focusing (NFF) is a fundamental enabler for a broad spectrum of applications utilizing large intelligent surfaces (LIS) within sub-10 GHz frequency bands. This paper investigates the impact of element pattern on NFF properties, when the LIS array is a large planar array. The NFF properties of maximum received power, focal width, and focal depth are analyzed for three typical antenna patterns of varying directivities at both the transmitter and receiver, along the array broadside. The results reveal that the peak received power occurs for the omni-directional pattern when the focal point approaches the array. In contrast, as the directivity increases, the peak power occurs when the focal point is farther from the array. Moreover,... (More)
Near-field focusing (NFF) is a fundamental enabler for a broad spectrum of applications utilizing large intelligent surfaces (LIS) within sub-10 GHz frequency bands. This paper investigates the impact of element pattern on NFF properties, when the LIS array is a large planar array. The NFF properties of maximum received power, focal width, and focal depth are analyzed for three typical antenna patterns of varying directivities at both the transmitter and receiver, along the array broadside. The results reveal that the peak received power occurs for the omni-directional pattern when the focal point approaches the array. In contrast, as the directivity increases, the peak power occurs when the focal point is farther from the array. Moreover, the peak received power positions of any given pair of transmitting-receiving antenna patterns is linearly proportional to array dimension. In addition, the more directive antenna has slightly broader focal width at distances closer to the array plane. The focal width approximates a Bessel function when the distance is close to the array plane, whereas the focal depth is narrower, and the sidelobe level lower. Similar behaviors are observed when the receiving antenna is laterally offset from the array broadside. (Less)
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author
and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
in press
subject
keywords
Near-field focusing, Large intelligent surface, Antenna pattern, Planar array, Pattern directivity
host publication
2025 IEEE International Symposium on Antennas & Propagation and North American Radio Science Meeting
pages
5 pages
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
conference name
2025 IEEE International Symposium on Antennas & Propagation and North American Radio Science Meeting
conference location
Ottawa, Canada
conference dates
2025-07-13 - 2025-07-18
project
Efficient Mid-range Wireless Power Transfer with Intelligent Surfaces
language
English
LU publication?
yes
id
db6f8e2b-bc68-43dd-a472-68d3369cc5a3
date added to LUP
2025-03-25 14:00:24
date last changed
2025-04-04 14:06:41
@inproceedings{db6f8e2b-bc68-43dd-a472-68d3369cc5a3,
  abstract     = {{Near-field focusing (NFF) is a fundamental enabler for a broad spectrum of applications utilizing large intelligent surfaces (LIS) within sub-10 GHz frequency bands. This paper investigates the impact of element pattern on NFF properties, when the LIS array is a large planar array. The NFF properties of maximum received power, focal width, and focal depth are analyzed for three typical antenna patterns of varying directivities at both the transmitter and receiver, along the array broadside. The results reveal that the peak received power occurs for the omni-directional pattern when the focal point approaches the array. In contrast, as the directivity increases, the peak power occurs when the focal point is farther from the array. Moreover, the peak received power positions of any given pair of transmitting-receiving antenna patterns is linearly proportional to array dimension. In addition, the more directive antenna has slightly broader focal width at distances closer to the array plane. The focal width approximates a Bessel function when the distance is close to the array plane, whereas the focal depth is narrower, and the sidelobe level lower. Similar behaviors are observed when the receiving antenna is laterally offset from the array broadside.}},
  author       = {{Li, Jiawang and Lau, Buon Kiong}},
  booktitle    = {{2025 IEEE International Symposium on Antennas & Propagation and North American Radio Science Meeting}},
  keywords     = {{Near-field focusing; Large intelligent surface; Antenna pattern; Planar array; Pattern directivity}},
  language     = {{eng}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  title        = {{Impact of antenna pattern directivity on near-field focusing of planar array in large intelligent surface applications}},
  year         = {{2025}},
}