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Flat Gain, Single-Layer Annular Cavity Filtenna Based on TM and Quasi-TM Modes

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

This letter proposes a novel, low-cost, single-layer filtering antenna (filtenna) for wireless communications. The design consists of a compact circular substrate-integrated waveguide (SIW) cavity, a centrally offset metal post for feeding, and a slot radiator for efficient radiation. It is based on an SIW coaxial line and utilizes multiple TM and quasi-TM modes. Unlike filtennas that rely on inline topologies, the proposed design employs a four-mode transversal topology to shorten signal propagation path, thereby reducing losses, particularly at millimeter-wave frequencies and beyond. The antenna is implemented on a single-layer PCB to minimize size, complexity and cost. The proposed filtenna achieves a 10 dB impedance bandwidth of... (More)

This letter proposes a novel, low-cost, single-layer filtering antenna (filtenna) for wireless communications. The design consists of a compact circular substrate-integrated waveguide (SIW) cavity, a centrally offset metal post for feeding, and a slot radiator for efficient radiation. It is based on an SIW coaxial line and utilizes multiple TM and quasi-TM modes. Unlike filtennas that rely on inline topologies, the proposed design employs a four-mode transversal topology to shorten signal propagation path, thereby reducing losses, particularly at millimeter-wave frequencies and beyond. The antenna is implemented on a single-layer PCB to minimize size, complexity and cost. The proposed filtenna achieves a 10 dB impedance bandwidth of 24.73% (16.83-21.58 GHz) in simulation and 26.54% (17.29-22.58 GHz) in measurement. It exhibits a stable radiation pattern with an average gain of 5.0 dBi and sideband suppression levels exceeding 50 dB on the lower sideband and 20 dB on the upper sideband. With its single-layer structure, low cost, and wideband capability, the proposed design is well-suited for emerging radio frequency applications.

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organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Filtenna, four-mode, sideband suppression level, SIW coaxial lines, transversal topology
in
IEEE Antennas and Wireless Propagation Letters
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • scopus:105003446414
ISSN
1536-1225
DOI
10.1109/LAWP.2025.3563353
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2002-2011 IEEE.
id
cc07c9ef-aee2-479c-97d7-7d8dc26cf3e7
date added to LUP
2025-08-18 15:05:16
date last changed
2025-08-18 15:06:36
@article{cc07c9ef-aee2-479c-97d7-7d8dc26cf3e7,
  abstract     = {{<p>This letter proposes a novel, low-cost, single-layer filtering antenna (filtenna) for wireless communications. The design consists of a compact circular substrate-integrated waveguide (SIW) cavity, a centrally offset metal post for feeding, and a slot radiator for efficient radiation. It is based on an SIW coaxial line and utilizes multiple TM and quasi-TM modes. Unlike filtennas that rely on inline topologies, the proposed design employs a four-mode transversal topology to shorten signal propagation path, thereby reducing losses, particularly at millimeter-wave frequencies and beyond. The antenna is implemented on a single-layer PCB to minimize size, complexity and cost. The proposed filtenna achieves a 10 dB impedance bandwidth of 24.73% (16.83-21.58 GHz) in simulation and 26.54% (17.29-22.58 GHz) in measurement. It exhibits a stable radiation pattern with an average gain of 5.0 dBi and sideband suppression levels exceeding 50 dB on the lower sideband and 20 dB on the upper sideband. With its single-layer structure, low cost, and wideband capability, the proposed design is well-suited for emerging radio frequency applications.</p>}},
  author       = {{Li, Jiawang and Aliakbari, Hanieh}},
  issn         = {{1536-1225}},
  keywords     = {{Filtenna; four-mode; sideband suppression level; SIW coaxial lines; transversal topology}},
  language     = {{eng}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  series       = {{IEEE Antennas and Wireless Propagation Letters}},
  title        = {{Flat Gain, Single-Layer Annular Cavity Filtenna Based on TM and Quasi-TM Modes}},
  url          = {{http://dx.doi.org/10.1109/LAWP.2025.3563353}},
  doi          = {{10.1109/LAWP.2025.3563353}},
  year         = {{2025}},
}