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Low-Profile Wideband Single-layer Monopolar Antenna with High-Selectivity and Stable Radiation Patterns

Li, Jiawang LU orcid ; Aliakbari, Hanieh LU orcid and Cao, Yuyan LU (2025) In IEEE Antennas and Wireless Propagation Letters
Abstract

This letter proposes a novel wideband, single-layer monopolar antenna with high selectivity and enhanced pattern stability across the operating band. Building upon a conventional circular patch antenna, the rejection levels of the upper and lower sidebands are carefully analyzed, designed, and optimized to achieve the desired performance. To further improve performance, a shorting-via-loaded ring is incorporated, effectively broadening the bandwidth while maintaining stable realized gain and consistent radiation patterns. Considering the trade-off between gain and stopband rejection, an appropriate substrate is selected to enhance upper-sideband rejection and ensure pattern stability. Additionally, an outer ring structure is introduced... (More)

This letter proposes a novel wideband, single-layer monopolar antenna with high selectivity and enhanced pattern stability across the operating band. Building upon a conventional circular patch antenna, the rejection levels of the upper and lower sidebands are carefully analyzed, designed, and optimized to achieve the desired performance. To further improve performance, a shorting-via-loaded ring is incorporated, effectively broadening the bandwidth while maintaining stable realized gain and consistent radiation patterns. Considering the trade-off between gain and stopband rejection, an appropriate substrate is selected to enhance upper-sideband rejection and ensure pattern stability. Additionally, an outer ring structure is introduced and precisely adjusted to enhance the roll-off characteristics of the lower band. The results indicate that the antenna achieves a simulated and measured -10 dB fractional bandwidth (FBW) of 31.2% (4.09 - 5.60 GHz) and 31.8% (4.04 - 5.57 GHz), respectively. It exhibits stable radiation patterns with an average gain of 6.17 dBi at an elevation angle of θ = 30°. The antenna also demonstrates sideband rejection levels exceeding 20 dB in the lower band and 19.5 dB in the upper band. With its single-layer structure, high selectivity, and stable pattern characteristics, the proposed design presents a promising solution for wireless applications.

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author
; and
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
high selectivity, monopolar, sideband rejection level, Single-layer
in
IEEE Antennas and Wireless Propagation Letters
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • scopus:105005185690
ISSN
1536-1225
DOI
10.1109/LAWP.2025.3569884
language
English
LU publication?
yes
id
e61c2450-ee92-48e0-b7f9-00a11f038568
date added to LUP
2025-09-19 10:52:01
date last changed
2025-10-14 12:46:37
@article{e61c2450-ee92-48e0-b7f9-00a11f038568,
  abstract     = {{<p>This letter proposes a novel wideband, single-layer monopolar antenna with high selectivity and enhanced pattern stability across the operating band. Building upon a conventional circular patch antenna, the rejection levels of the upper and lower sidebands are carefully analyzed, designed, and optimized to achieve the desired performance. To further improve performance, a shorting-via-loaded ring is incorporated, effectively broadening the bandwidth while maintaining stable realized gain and consistent radiation patterns. Considering the trade-off between gain and stopband rejection, an appropriate substrate is selected to enhance upper-sideband rejection and ensure pattern stability. Additionally, an outer ring structure is introduced and precisely adjusted to enhance the roll-off characteristics of the lower band. The results indicate that the antenna achieves a simulated and measured -10 dB fractional bandwidth (FBW) of 31.2% (4.09 - 5.60 GHz) and 31.8% (4.04 - 5.57 GHz), respectively. It exhibits stable radiation patterns with an average gain of 6.17 dBi at an elevation angle of θ = 30°. The antenna also demonstrates sideband rejection levels exceeding 20 dB in the lower band and 19.5 dB in the upper band. With its single-layer structure, high selectivity, and stable pattern characteristics, the proposed design presents a promising solution for wireless applications.</p>}},
  author       = {{Li, Jiawang and Aliakbari, Hanieh and Cao, Yuyan}},
  issn         = {{1536-1225}},
  keywords     = {{high selectivity; monopolar; sideband rejection level; Single-layer}},
  language     = {{eng}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  series       = {{IEEE Antennas and Wireless Propagation Letters}},
  title        = {{Low-Profile Wideband Single-layer Monopolar Antenna with High-Selectivity and Stable Radiation Patterns}},
  url          = {{http://dx.doi.org/10.1109/LAWP.2025.3569884}},
  doi          = {{10.1109/LAWP.2025.3569884}},
  year         = {{2025}},
}