Wearable Circularly Polarized SIW Antenna for Off-body Communications

Guo Ping Gao; Jin Ming Bai; Li Jun Jin; Ge Ma; Dan Wang; Shi Chen Wang; Bin Hu

doi:10.1109/LAWP.2025.3545640

Wearable Circularly Polarized SIW Antenna for Off-body Communications

Guo Ping Gao, Jin Ming Bai, Li Jun Jin, Ge Ma, Dan Wang, Shi Chen Wang, Bin Hu^*

^*Corresponding author for this work

Lanzhou University

Research output: Contribution to journal › Article › peer-review

Abstract

A compact low-profile circularly polarized Substrate Integrated Waveguide (SIW) Antenna for off-body communications is proposed. The antenna is made of felt and conductive fabric to have good wearability. An annulus slot and four rectangular slots are etched on a circular SIW to adjust and combine the TM11 mode of the circular patch with the TM₀₁₀ mode of the SIW resonant cavity, thereby achieving broadband. To achieve circular polarization, an inclined 45 ° rectangular slot is etched on the circular patch. The measured -3 dB Axial Ratio (AR) bandwidth is 240 MHz (5.31 GHz -5.56 GHz). The average gain in the working band is 7.76 dBi. The low Specific Absorption Ratio (SAR) results also demonstrate that the radiation of the antenna to the human body is within the safe range.

Original language	English
Journal	IEEE Antennas and Wireless Propagation Letters
DOIs	https://doi.org/10.1109/LAWP.2025.3545640
Publication status	Accepted/In press - 2025
Externally published	Yes

Keywords

circularly polarized antenna
low-profile
off-body
SIW

Access to Document

10.1109/LAWP.2025.3545640

Cite this

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title = "Wearable Circularly Polarized SIW Antenna for Off-body Communications",

abstract = "A compact low-profile circularly polarized Substrate Integrated Waveguide (SIW) Antenna for off-body communications is proposed. The antenna is made of felt and conductive fabric to have good wearability. An annulus slot and four rectangular slots are etched on a circular SIW to adjust and combine the TM11 mode of the circular patch with the TM010 mode of the SIW resonant cavity, thereby achieving broadband. To achieve circular polarization, an inclined 45 ° rectangular slot is etched on the circular patch. The measured -3 dB Axial Ratio (AR) bandwidth is 240 MHz (5.31 GHz -5.56 GHz). The average gain in the working band is 7.76 dBi. The low Specific Absorption Ratio (SAR) results also demonstrate that the radiation of the antenna to the human body is within the safe range.",

keywords = "circularly polarized antenna, low-profile, off-body, SIW",

author = "Gao, {Guo Ping} and Bai, {Jin Ming} and Jin, {Li Jun} and Ge Ma and Dan Wang and Wang, {Shi Chen} and Bin Hu",

note = "Publisher Copyright: {\textcopyright} 2002-2011 IEEE.",

year = "2025",

doi = "10.1109/LAWP.2025.3545640",

language = "English",

journal = "IEEE Antennas and Wireless Propagation Letters",

issn = "1536-1225",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

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T1 - Wearable Circularly Polarized SIW Antenna for Off-body Communications

AU - Gao, Guo Ping

AU - Bai, Jin Ming

AU - Jin, Li Jun

AU - Ma, Ge

AU - Wang, Dan

AU - Wang, Shi Chen

AU - Hu, Bin

PY - 2025

Y1 - 2025

N2 - A compact low-profile circularly polarized Substrate Integrated Waveguide (SIW) Antenna for off-body communications is proposed. The antenna is made of felt and conductive fabric to have good wearability. An annulus slot and four rectangular slots are etched on a circular SIW to adjust and combine the TM11 mode of the circular patch with the TM010 mode of the SIW resonant cavity, thereby achieving broadband. To achieve circular polarization, an inclined 45 ° rectangular slot is etched on the circular patch. The measured -3 dB Axial Ratio (AR) bandwidth is 240 MHz (5.31 GHz -5.56 GHz). The average gain in the working band is 7.76 dBi. The low Specific Absorption Ratio (SAR) results also demonstrate that the radiation of the antenna to the human body is within the safe range.

AB - A compact low-profile circularly polarized Substrate Integrated Waveguide (SIW) Antenna for off-body communications is proposed. The antenna is made of felt and conductive fabric to have good wearability. An annulus slot and four rectangular slots are etched on a circular SIW to adjust and combine the TM11 mode of the circular patch with the TM010 mode of the SIW resonant cavity, thereby achieving broadband. To achieve circular polarization, an inclined 45 ° rectangular slot is etched on the circular patch. The measured -3 dB Axial Ratio (AR) bandwidth is 240 MHz (5.31 GHz -5.56 GHz). The average gain in the working band is 7.76 dBi. The low Specific Absorption Ratio (SAR) results also demonstrate that the radiation of the antenna to the human body is within the safe range.

KW - circularly polarized antenna

KW - low-profile

KW - off-body

KW - SIW

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U2 - 10.1109/LAWP.2025.3545640

DO - 10.1109/LAWP.2025.3545640

M3 - Article

AN - SCOPUS:85218927811

SN - 1536-1225

JO - IEEE Antennas and Wireless Propagation Letters

JF - IEEE Antennas and Wireless Propagation Letters

ER -

Wearable Circularly Polarized SIW Antenna for Off-body Communications

Abstract

Keywords

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