A single-fed miniaturized circularly polarized implantable antenna for ISM band biomedical application

A novel coplanar waveguide fed Industrial, Scientific, and Medical (ISM) band implantable crossed-type triangular slot antenna is proposed for biomedical applications. The antenna operates at the center frequency of 2450 MHz, which is in ISM band, to support GHz wideband communication for high-data rate implantable biomedical application. The size of the antenna is 78 mm3 (10 mm × 12 mm × 0.65 mm). The simulated and measured bandwidths are 7.9 and 8.2% at the resonant frequency of 2.45 GHz. The specific absorption rate distribution induced by the implantable antenna inside a human body tissue model is evaluated. The communication between the implanted antenna and external device is also examined. The proposed antenna has substantial merits such as miniaturization, lower return loss, better impedance matching, and high gain over other implanted antennas.

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Miniaturized Circularly Polarized Implantable Antenna for ISM-Band Biomedical Devices

International Journal of Antennas and Propagation ◽

10.1155/2017/9750257 ◽

2017 ◽

Vol 2017 ◽

pp. 1-9 ◽

Cited By ~ 11

Author(s):

Ke Zhang ◽

Changrong Liu ◽

Xueguan Liu ◽

Huiping Guo ◽

Xinmi Yang

Keyword(s):

Patch Antenna ◽

Axial Ratio ◽

Microstrip Patch Antenna ◽

Impedance Bandwidth ◽

Optimized Design ◽

Circularly Polarized ◽

Ism Band ◽

Microstrip Patch ◽

Compact Size ◽

Implantable Antenna

A compact circularly polarized antenna operating at 915 MHz industrial, scientific, and medical (ISM) band for biomedical implantable applications is presented and experimentally measured. The proposed antenna can be miniaturized to a large extent with the compact size of 15 × 15 × 1.27 mm3 by means of loading patches to a ring-shaped microstrip patch antenna. An impedance bandwidth of 10.6% (865–962 MHz) for reflection coefficient less than −10 dB can be obtained. Meanwhile, the simulated 3 dB axial-ratio (AR) bandwidth reaches 14 MHz. Finally, the optimized design was fabricated and tested, and the measured results agree well with simulated results.

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Design and performance analysis of a CPW ‐fed circularly polarized implantable antenna for 2.45 GHz ISM band

Microwave and Optical Technology Letters ◽

10.1002/mop.32514 ◽

2020 ◽

Vol 62 (12) ◽

pp. 3952-3959

Author(s):

Vipan Kumar Gupta ◽

Deepali Thakur

Keyword(s):

Performance Analysis ◽

Circularly Polarized ◽

Ism Band ◽

Implantable Antenna ◽

And Performance

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A Wideband Circularly Polarized Implantable Antenna for 915 MHz ISM-Band Biotelemetry Devices

IEEE Antennas and Wireless Propagation Letters ◽

10.1109/lawp.2018.2849847 ◽

2018 ◽

Vol 17 (8) ◽

pp. 1473-1477 ◽

Cited By ~ 16

Author(s):

Yudi Zhang ◽

Changrong Liu ◽

Xueguan Liu ◽

Ke Zhang ◽

Xinmi Yang

Keyword(s):

Circularly Polarized ◽

Ism Band ◽

Implantable Antenna

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A Miniaturized Circularly-Polarized Antenna for In-Body Wireless Communications

Micromachines ◽

10.3390/mi10010070 ◽

2019 ◽

Vol 10 (1) ◽

pp. 70 ◽

Cited By ~ 2

Author(s):

Yi Fan ◽

Xiongying Liu ◽

Jiming Li ◽

Tianhai Chang

Keyword(s):

Wireless Communications ◽

Ex Vivo ◽

Axial Ratio ◽

Impedance Bandwidth ◽

Circularly Polarized ◽

Ism Band ◽

Left Handed ◽

Current Path ◽

Implantable Antenna ◽

Good Agreement

A novel miniaturized single-fed circularly-polarized (CP) microstrip patch antenna operating in the Industrial, Scientific, Medical (ISM) band of 2.40–2.48 GHz, is comprehensively proposed for implantable wireless communications. By employing reactive loading in the arrow-shaped slotted patch to form slow wave effect and embedding V-shaped slots into patch to lengthen the current path, the proposed implantable antenna is minimized with the overall dimensions of 9.2 mm × 9.2 mm × 1.27 mm. The radiation patterns of the proposed antenna illustrate the performance of left-handed circular polarization. The simulated results show that an impedance bandwidth of 7.2% (2.39–2.57 GHz) and an axial ratio bandwidth of 3.7% (2.39–2.48 GHz) at the ISM band are achieved, respectively. Ex vivo measured results are in good agreement with the corresponding simulated ones.

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