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Author

Elizabeth Rufus

Other affiliations: Middle East College
Bio: Elizabeth Rufus is an academic researcher from VIT University. The author has contributed to research in topics: Patch antenna & Microstrip antenna. The author has an hindex of 5, co-authored 23 publications receiving 54 citations. Previous affiliations of Elizabeth Rufus include Middle East College.

Papers
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Journal ArticleDOI
TL;DR: The paper provides useful information on implantable antennas design for biomedical application, which needs to meet requirements such as compact size, patients’ safety, communication ability and biocompatibility.
Abstract: The paper aims to focus on implantable antenna sensors used for biomedical applications. Communication in implantable medical devices (IMDs) is beneficial for continuous monitoring of health. The ability to communicate with exterior equipment is an important aspect of IMD. Thus, the design of an implantable antenna for integration into IMD is important.,In this review, recent developments in IMDs, three types of antenna sensors, which are recommended by researchers for biomedical implants are considered. In this review, design requirements, different types of their antenna, parameters and characteristics in medical implants communication system (MICS) and industrial, scientific and medical (ISM) bands are summarized here. Also, overall current progress in development of implantable antenna sensor, its challenges and the importance of human body characteristics are described.,This article give information about the requirements of implantable antenna sensor designs, types of antennas useful to design implantable devices and their characteristics in MICS and ISM bands. Recent advancement in implantable devices has led to an improvement in human health.,The paper provides useful information on implantable antennas design for biomedical application. The designing of such antennas needs to meet requirements such as compact size, patients’ safety, communication ability and biocompatibility.

13 citations

01 Jan 2012
TL;DR: A microwave imaging experimental set up using a 1-D beamforming algorithm for the detection of buried object using UWB antenna operating at 1{ 11GHz, and the experimental validation is developed.
Abstract: In this paper, we have developed a microwave imaging experimental set up using a 1-D beamforming algorithm for the detection of buried object using UWB antenna operating at 1{ 11GHz, and done the experimental validation. The experiment consists of a mechanical scanner with 3.6mm resolution in the X and Y directions, UWB horn antenna which sweeps over the frequency range. The antenna transmits the microwave signal and receives the backscatters from all the objects. These backscatters are passed through the 1-D bean former designed to image the backscatter energy as a function of location. Object of size 4mm embedded in the sand bath has been detected using the developed microwave imaging set up. 1. INTRODUCTION The studies conducted in the past have proved the potential of microwave imaging technique for many applications in the fleld of non destructive evaluation. Difierent types of microwave imaging systems are currently being used for imaging in areas such as ground penetrating radar and remote sensing. Depending on the objects and medium to be imaged, difierent antennas are needed; these range from small antennas used for near fleld measurements in ground penetrating radar to large airborne system used in remote sensing. Microwave imaging using the subsurface UWB radar technique do not attempt to reconstruct the dielectric properties proflle of the object, instead seeks to identify the presence and location of signiflcant scatterers in the medium. To create images from microwave measurements, it is necessary to construct a microwave imaging system which is able to transmit microwaves and measure the scattered waves at one or more antennas. There are two key issues to address while designing a microwave imaging system. One is the increase of the signal to noise ratio in the system and the other is to assure that the system has a large dynamic range. These are important because of the fact that the scattered signal is often weak in comparison with the transmitted signal. This implies that any noise in the system will have large impact on the image quality and then the system must be able to distinguish even small difierence in the received signals. Microwave imaging can be done in two ways. One based on analysis of the transmitted signals from the target, and another is by analyzing the scattered signals. The latter technique is used in many applications because it can be done with one antenna or both antennas at nearby distances. UWB based radar technique is used in this work to detect the embedded objects to locate the position and size In radar based techniques, the wide bandwidth is a prerequisite to achieving high fldelity of the radiated pulse. The multi-frequency approach allows for the reconstruction of the permittivity distribution with higher fldelity compared to a single frequency or narrow band reconstruction (1).

13 citations

Proceedings ArticleDOI
27 Mar 2014
TL;DR: The feasibility of using a circular microstrip patch antenna fabricated on flexible kapton substrate to measure strain is investigated by performing a preliminary laboratory experiment.
Abstract: In this paper the feasibility of using a circular microstrip patch antenna fabricated on flexible kapton substrate to measure strain is investigated by performing a preliminary laboratory experiment. When a patch antenna is deformed, the dimensions of the antenna changes and hence the resonant frequency of the antenna changes which is taken to be an indication of change in the strain applied. A circular microstrip patch antenna on a flexible kapton substrate operating at 4.618 GHz has been designed based on the relation between the radius of the circular patch and its resonant frequency. The resonant frequency of the microstrip patch antenna decreases linearly with the increase in the applied strain. The shift in the resonant frequency is nearly 3 MHz when the stain is 0.18% This microstrip circular patch antenna can be used with other components easily and can be very useful in biomedicai applications and in structural health monitoring.

9 citations

Proceedings ArticleDOI
04 Dec 2005
TL;DR: In this paper, the complex dielectric constants at room temperature of various goat tissues (liver, muscle, kidney, heart and brain) were measured in the frequency range 1 to 10 GHz with the help of a HP network analyser HP 8510A Open ended coaxial cable method was employed for the measurement.
Abstract: The complex dielectric constants at room temperature of various goat tissues (liver, muscle, kidney, heart and brain) were measured in the frequency range 1 to 10 GHz with the help of a HP network analyser HP 8510A Open ended coaxial cable method was employed for the measurement The system imperfections are completely avoided by calibrating the system with four known materials and their reflection coefficients were used in the calculation along with the reflection coefficient of the sample The relaxation frequency in the /spl delta/ region, spread of relaxation, volume fraction of protein present in tissues are calculated from the measured dielectric data

7 citations

Proceedings ArticleDOI
01 Mar 2019
TL;DR: The paper discusses the application of unmanned aerial vehicles for the purpose of product scanning in inventory and stock management using RFID in warehouses and incorporates a detailed comparison between multiple sampling-based path planning algorithms.
Abstract: The paper discusses the application of unmanned aerial vehicles for the purpose of product scanning in inventory and stock management using RFID in warehouses. This work also incorporates a detailed comparison between multiple sampling-based path planning algorithms which can be deployed for mobile unmanned vehicular systems for the purposes of product retrieval.

7 citations


Cited by
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Journal ArticleDOI
TL;DR: Fiber optic sensing technology has become mature because of acceptable costs, compact instrumentation, high accuracy and the capability of performing measurements at inaccessible sites, over large distances, in strong (electro) magnetic fields and in harsh environment.
Abstract: High-quality optical fibers can be produced now at a low cost and large quantity, and this has further promoted the development of fiber optic (chemical) sensors. After over 30 years of innovation, fiber optic sensing technology has become mature because of acceptable costs, compact instrumentation, high accuracy and the capability of performing measurements at inaccessible sites, over large distances, in strong (electro)magnetic fields and in harsh environment. The technology is still proceeding quickly in terms of innovation, and respective applications have been found in highly diversified fields. This review covers work published in the time period between October 2015 and October 2019. It is written in continuation of previous reviews.

169 citations

Book ChapterDOI
John W. Moore1
01 Apr 1975
TL;DR: This collection of papers given at the Colloquium on Membranes, Ions, and Impulses is dedicated to Kacy Cole and Dan Tosteson, the American Physiological Society President for 1974.
Abstract: The title of the Colloquium on Membranes, Ions, and Impulses was chosen from Cole’s book, and it is a pleasure to dedicate this collection of papers given at the Colloquium to Kacy. It is a privilege to be in the unique position of having been associated with both Kacy Cole and Dan Tosteson, our American Physiological Society President for 1974.

130 citations

Journal ArticleDOI
TL;DR: The need for flexible antennas, materials, and processes used for fabricating the antennas, various material properties influencing antenna performance, and specific biomedical applications accompanied by the design considerations are focused on.
Abstract: The field of flexible antennas is witnessing an exponential growth due to the demand for wearable devices, Internet of Things (IoT) framework, point of care devices, personalized medicine platform, 5G technology, wireless sensor networks, and communication devices with a smaller form factor to name a few. The choice of non-rigid antennas is application specific and depends on the type of substrate, materials used, processing techniques, antenna performance, and the surrounding environment. There are numerous design innovations, new materials and material properties, intriguing fabrication methods, and niche applications. This review article focuses on the need for flexible antennas, materials, and processes used for fabricating the antennas, various material properties influencing antenna performance, and specific biomedical applications accompanied by the design considerations. After a comprehensive treatment of the above-mentioned topics, the article will focus on inherent challenges and future prospects of flexible antennas. Finally, an insight into the application of flexible antenna on future wireless solutions is discussed.

101 citations

Journal ArticleDOI
TL;DR: In this article, a dual-function flexible loop antenna printed on polyvinyl chloride (PVC) substrate is presented, which can also serve as a temperature sensor by means of change in resistance.
Abstract: The ever-increasing number of devices on wearable and portable systems comes with challenges such as integration complexity, higher power requirements, and less user comfort. In this regard, the development of multifunctional devices could help immensely as they will provide the same functionalities with lesser number of devices. Herein, we present a dual-function flexible loop antenna printed on polyvinyl chloride (PVC) substrate. With a poly(3,4-ethylenedioxythiophene): polystyrene (PEDOT:PSS) section as part of the printed structure, the presented antenna can also serve as a temperature sensor by means of change in resistance. The antenna resonates at 1.2- and 5.8-GHz frequencies. The ohmic resistance of the temperature sensing part decreases by ~70% when the temperature increases from 25 °C to 90 °C. The developed antenna was characterized using a vector network analyzer (VNA) in the same temperature range and the S11 magnitude was found to change by ~3.5 dB. The induced current was also measured in the GSM frequency range and sensitivity of ~1.2%/°C was observed for the sensing antenna. The flexible antenna was also evaluated in lateral and cross-bending conditions and the response was found to be stable for the cross-bending. Due to these unique features, the presented antenna sensor could play a vital role in the drive toward ubiquitous sensing through wearables, smart labels, and the Internet of Things (IoT).

64 citations