Miniaturized implantable DS-PIFA antenna for biomedical applications

© 2015 ICST. This paper presents an implantable miniaturized planar inverted-F antenna (PIFA) for biomedical applications. We propose small sized PIFA that can operate over 2.45 GHz Industrial, Scientific, and Medical (ISM) band. We have investigated the effect of antenna parameters on resonant frequencies using empirical parametric studies and achieved highly compact PIFA antenna occupies a volume of 92 mm3 with a size of 8.1×7.1×1.6 mm3. Moreover, the effects of the variation of surrounding environment such as skin and fat thickness on the antenna performance are also considered. The impedance characteristics of the proposed antennas are measured using experimental tissue mimicking phantoms. We have also evaluated the calculated Specific Absorption Rate (SAR) by using an indirect thermal method to measure the SAR inside the mimicking phantom

Miniaturized E-shaped PIFA antenna for wideband implantable biomedical applications

This paper presents an implantable miniaturised printed E-shaped PIFA antenna for biomedical applications at 2.4 GHz. The design and measured results for the proposed antenna suitable for implanting either in the arm or under the chest are presented. Simulations are conducted using both homogeneous and inhomogeneous phantoms to help to design the proposed antenna. The measured results are obtained by immersing a prototype of the proposed antenna in a phantom that consists of meat-mixture. The antenna is fed by a coaxial probe and optimizes the placement of shorting pin to obtain superior performance. The antenna occupies a volume less than 1cm 3 without the biocompatible insulation and its size reduction is about 60% compared to the standard E-shaped patch antenna reported in the literature. © 2013 IEEE

Design of a UWB printed G-shaped monopole antenna using characteristic modes

© 2014 IEEE. This paper presents a novel G-shaped compact monopole UWB antenna printed on FR4 substrate with coplanar waveguide (CPW) feeding. The proposed antenna operates over the frequency band between 3 and 11 GHz offering a fractional impedance bandwidth of around 110 %. The antenna is designed by analysing the modal currents calculated using the characteristic mode theory. Experimental results on reflection coefficient agree well with simulations and the proposed antenna has a desirable gain and radiation pattern characteristics over the ultra-wideband frequency range. The overall dimensions of the antenna are 28 × 35 × 1.6 mm3 which makes it a good candidate for many ultra-wide-band radio applications

Singly-fed shaped planar inverted-F antenna for circular polarization

© 2016 IEEE. We propose a singly-fed planar inverted-F antenna (PIFA), with double-shorting planes and a tapered patch for radiating circular polarization. FEKO® simulations are employed to optimize the geometry of the antenna. The antenna prototype resonates at 2.52GHz and has a measured impedance bandwidth of around 240MHz. The calculated 3dB axial ratio bandwidth falls within the impedance bandwidth, demonstrating satisfactory circular polarization characteristics

Techniques for RF localization of wireless capsule endoscopy

© 2016 IEEE. Location estimation of a wireless capsule endoscope at 400 MHz MICS band is implemented here using both RSSI and TOA-based techniques and their performance investigated. To improve the RSSI-based location estimation, a maximum likelihood (ML) estimation method is employed. For the TOA-based localization, FDTD coupled with continuous wavelet transform (CWT) is used to estimate the time of arrival and localization is performed using multilateration. The performances of the proposed localization algorithms are evaluated using a computational heterogeneous biological tissue phantom in the 402MHz-405MHz MICS band. Our investigations reveal that the accuracy obtained by TOA based method is superior to RSSI based estimates. It has been observed that the ML method substantially improves the accuracy of the RSSI-based location estimation

Miniature implantable PIFA for telemetry in the ISM band: Design and link budget analysis

© 2015 The Institute of Electronics, Information and Comm. An implantable miniaturized planar inverted-F antenna (PIFA) that can operate over 2.45 GHz Industrial, Scientific, and Medical (ISM) band which occupies a small volume of 92 mm3 is proposed. The impedance characteristics of the proposed antenna are measured using experimental tissue mimicking phantoms. The proposed compact PIFA has a size of 8.1×7.1×1.6 mm3 which is tested using both numerical and mixed meat phantoms for implantation either under the chest or arm or inside a muscle. An analysis of the communication link between the implanted antenna and external dipole antenna has also been examined along with a statistical pass loss analysis. Moreover, the Specific Absorption Rate (SAR) distribution induced by the implantable antenna inside a human tissue phantom has also been evaluated

Miniaturized Slot PIFA Antenna for Tripleband Implantable Biomedical Applications

This paper presents the design of a triple-band implantable miniaturised slot PIFA antenna for Medical Implant Communication Service (MICS) band at 433MHz, Wireless Medical Telemetry Service (WMTS) band at 1430 MHz and Industrial, Scientific, and Medical (ISM) band at 2.4GHz. Simulations based on homogeneous and inhomogeneous phantoms are employed to design the proposed small antenna suitable for implanting in the arm or under the chest. The measured results are obtained by immersing a prototype of the proposed antenna in a phantom. The antenna occupies a volume less than 1cm3 and its size reduction is about 50% compared to the standard E-shaped patch antenna reported in the literatur