Capacitively Loaded Circularly Polarized Implantable Patch Antenna for ISM Band Biomedical Applications

Abstract A compact, circularly polarized, CPW-fed antenna is proposed for wearable applications in ISM Band (5.8 GHz). The antenna is based on DGS, where the ground plane is responsible for impedance matching. The 10 dB impedance of the proposed antenna varies from 5.39 GHz to 5.94 GHz. The circular stub introduced in the ground plane mitigates the surface current and enriches the 3 dB axial ratio from 5.73 GHz to 5.92 GHz. Proposed antenna exhibits the LHCP and RHCP pattern of circular polarization, the antenna can effectively work for biomedical and wearable applications. The antenna is analyzed on the skin phantom model and the SAR value obtained is 1.218 W/kg, which is below the maximum permissible level. The proposed antenna is also used for the detection of breast tumors.

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In-Vitro Test of Miniaturized CPW-Fed Implantable Conformal Patch Antenna at ISM Band for Biomedical Applications

IEEE Access ◽

10.1109/access.2019.2905661 ◽

2019 ◽

Vol 7 ◽

pp. 43547-43554 ◽

Cited By ~ 7

Author(s):

Kumar Naik Ketavath ◽

Dattatreya Gopi ◽

Sriram Sandhya Rani

Keyword(s):

Patch Antenna ◽

Biomedical Applications ◽

In Vitro Test ◽

Ism Band ◽

Vitro Test

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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, Simulation and Fabrication of an Implanted Antenna at ISM Band in Body Tissue

10.21203/rs.3.rs-193255/v1 ◽

2021 ◽

Author(s):

Majedeh Seydi ◽

Mohammad Sajjad Bayati

Keyword(s):

Patch Antenna ◽

Biomedical Applications ◽

Impedance Matching ◽

Ism Band ◽

Microstrip Patch ◽

Rectangular Patch ◽

Shorting Pin ◽

L 14 ◽

Minced Meat ◽

Coaxial Probe

Abstract A rectangular meandering-microstrip patch antenna (RM-MPA) with shorting pin for implant antenna and biomedical applications at industrial, scientific, and medical (ISM) band is proposed. The rectangular patch has length of l =14 mm and width of w =9.4 mm. The substrate and superstrate are made of Rogers 3210 with dielectric constant equals 10.2. The RMMPA is placed between the substrate and superstrate dielectric layers whose same thickness equals 0.635 mm. The proposed antenna is fed by a 50-ohm coaxial probe, at the centre of the length and edge of the width of the patch. The input impedance of patch antenna varies with the patch geometry. Thus, the geometry of the patch changed to achieve impedance matching at ISM band. The rectangular patch divided to three sections along width for meandering. The resonance frequency is tuned by meandering each section. The proposed antenna is simulated in free space and skin phantom. Proposed antenna has efficiency of 90%, bandwidth 1.02%. Both radiation pattern and SAR are evaluated which SAR level is below the safety and satisfies SAR standards. Finally, the antenna is tested in minced meat and tissue liquid.

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Design of 2×1 circularly polarized microstrip patch antenna array for 5.8 GHz ISM band applications

2012 Nirma University International Conference on Engineering (NUiCONE) ◽

10.1109/nuicone.2012.6493227 ◽

2012 ◽

Cited By ~ 2

Author(s):

Jayesh V. Gohil ◽

Deepak Bhatia

Keyword(s):

Antenna Array ◽

Patch Antenna ◽

Microstrip Patch Antenna ◽

Circularly Polarized ◽

Ism Band ◽

Microstrip Patch

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Compact Circularly Polarized Slotted Symmetric V slits Microstrip Patch Antenna for ISM Band Applications

Asian Journal of Applied Sciences ◽

10.24203/ajas.v8i6.6385 ◽

2020 ◽

Vol 8 (6) ◽

Author(s):

Naw Khu Say Wah ◽

Hla Myo Tun

Keyword(s):

Patch Antenna ◽

Microstrip Antenna ◽

Axial Ratio ◽

Substrate Material ◽

Microstrip Patch Antenna ◽

Polarization Pattern ◽

Circularly Polarized ◽

Ism Band ◽

Antenna Theory ◽

Microstrip Patch

This paper presents a short microstrip patch antenna and analyzes its characteristics in simulation and measured ways. The proposed antenna is meant to be used from 2.4 to 2.5 GHz at the resonant frequency of 2.45 GHz Industrial, Science, and Medical (ISM) spectrum. Besides, insert a diagonal slot in the main patch, and two cutting edges with V-slit gives the antenna to propagate a circular polarization pattern. The paper aims to start learning a simple C.P. patch antenna supported the basic concept of microstrip antenna theory. A single-feed C.P., truncated corners, and slit and slot methods are employed to model the antenna apart from its parametric study. The substrate material of the developed antenna is FR-4, and it's a relative permittivity of 4.4. The antenna incorporates a compact overall size of 0.389λ0 × 0.389λ0 × 0.013λ0, where λ0 is that the corresponding free-space wavelength at 2.45 GHz. FEKO has been used for not only designing the antenna model but also analyzing its performances. Simulated and measured results have reported that the antenna can work in ISM bands (2.42-2.5 GHz) with VSWR< 2, low realized gain, and the limited 3-dB axial ratio at 2.45 GHz.

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