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2025-07-05
Broadband Circularly Polarized Implantable Antenna Loaded with Open Slots for Biomedical Applications
By
Progress In Electromagnetics Research C, Vol. 157, 109-117, 2025
Abstract
This paper presents a broadband circularly polarized (CP) implantable antenna for biomedical applications operating in the 2.45 GHz Industrial, Scientific, and Medical (ISM) band. Its key innovation is an annular ground plane structure with a square open slot, which simultaneously broadens both impedance and axial ratio (AR) bandwidths. This achieves a wide effective bandwidth of 30.8% (2.17-2.96 GHz), demonstrating superior bandwidth compared to existing implantable CP antennas. The antenna employs an inverted S-shaped radiating patch, and by adjusting the position of the radiating branches, it can switch between left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP). The simulated and measured results of the antenna show good agreement, and the SAR meets IEEE standards.
Citation
Leyuan Li, Guolong Wang, Ying Sun, Zhuopeng Wang, and Lin Shao, "Broadband Circularly Polarized Implantable Antenna Loaded with Open Slots for Biomedical Applications," Progress In Electromagnetics Research C, Vol. 157, 109-117, 2025.
doi:10.2528/PIERC25052004
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