T. Shanmuganantham

Implanted CPW Fed Monopole Antenna for Biomedical Applications

In this paper, a novel implantable CPW fed monopole antenna mounted over human tissue is proposed for biomedical applications. The proposed antenna covers the ISM band of 2.4 GHz. The radiation parameters such as return loss, VSWR, Z-parameter, etc. are analyzed using the method of moments software (IE3D).The proposed antenna has substantial merits like low profile, miniaturization, return loss, & better impedance matching and lower over other implanted antennas.

Design of an implantable CPW fed dual dipole antenna for dual band biomedical applications

An implantable Coplanar Waveguide (CPW) fed dipole antenna operates in the Industrial, Scientific Medical (ISM) band and Wireless Medical Telemetry Services (WMTS) band for biomedical applications. The proposed implanted antenna is made compatible for implantation by embedding it in an alumina ceramic substrate. The proposed antenna was simulated using the method of moments software IE3D by assuming the predetermined dielectric constant for the human body muscle, fat and skin tissues, and the parameters of an implantable antennas such as return loss, radiation pattern and Voltage Standing Wave Ratio (VSWR) with human body phantom liquid are plotted and it is verified with simulated results. The proposed antenna shows the lower return loss, perfect impedance matching and high gain as compared to other implanted antennas. The experiments permitted to identifying the most efficient tissue placements, and proposing some quantitative and general guidelines useful to characterise and design this kind of new system.

Design and modeling of RF MEMS metal contact switch for wireless applications

This paper presents the modeling and design of a radio frequency microelectromechanical system (RF MEMS) series metal contact switch. The proposed switch has a dual cantilever beam at one end and the other end is fixed with two anchors. The design is optimized to lower the pull-in voltage and to improve the RF performance. The proposed design has a low spring constant due to its optimized structural parameters, which results in a pull-in voltage of about 4V. The variations in the dimensions are made without affecting the RF performance of the switch. The switch shows a high isolation of about −58.3dB at 12 GHz and low insertion loss of about −0.10 dB at 12 GHz. The reflection coefficient of the switch in the off and the ON state are found to be −7.56 dB and −10.82 dB at 12 GHz respectively.

Compact ACS-fed antenna with DGS and DMS for WiMAX/WLAN applications

A novel compact asymmetric coplanar strip fed planar antenna with defected ground structure and defected microstrip structure for dual band application is presented. The proposed antenna is composed of defect in both ground plane and radiating strip. The antenna has an overall dimension of 21 × 15.35 × 1.6 mm 3 when printed on a substrate with dielectric constant of 4.4 and loss tangent of 0.02. The antenna resonating at two different frequencies of 3.5 and 5.5 GHz is covering w orldwide interoperability microwave access and wireless local area network bands. The planar design, simple feeding technique, and compactness make it easy for the integration of the antenna into the circuit board. Details of the antenna design, simulated, and experimental results are presented and discussed. Simulation tool, based on the method of moments (Mentor Graphics IE3D version 15.10) has been used to analyze and optimize the antenna.

CPW fed monopole implantable antenna for 2.45 GHz ISM band applications

The present paper is a study on the design and characteristics of dual V shaped monopole antenna embedded in animal tissue and human body phantom liquid operating in the frequency of industrial, scientific and medical (ISM –915 MHz and 2.45 GHz) bands. This study proposes a prototype that is fabricated and tested in the parametric model of a coplanar waveguide-fed dual V shaped monopole antenna. To make the designed antenna suitable for implantation, it is embedded in an FR4 substrate (εr = 4.4 and thickness = 1.6 mm). The proposed antenna is simulated with help of IE3D simulator and measured by circumfusing in a human body phantom liquid. In this paper, the performance of implantable antenna in its dielectric parameter environment is studied. The experimental results show how the exhibited radiation performance strongly depends on design antenna parameters and resonant frequency. The simulated and experimental results demonstrate that the antenna covers the complete ISM band.

Design of Implantable CPW Fed Monopole Antenna for ISM Band Applications

Copyright ©2014 KIEEME. All rights reserved. This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited. pISSN: 1229-7607 eISSN: 2092-7592 DOI: http://dx.doi.org/10.4313/TEEM.2014.15.2.55 TRANSACTIONS ON ELECTRICAL AND ELECTRONIC MATERIALS Vol. 15, No. 2, pp. 55-59, April 25, 2014

Implantable CPW fed Z-shaped antenna for ISM band

In this paper, CPW fed Z-shaped antenna design is proposed for medical in-body wireless communications. The antenna has a simple structure with low profile and is placed on human tissues like Muscle, Fat and Skin. The designed antenna is made compatible for implantation by embedding it in an alumina ceramic substrate. The impedance matching characteristics have been analyzed both in free space as well as on body surface. The projected antenna is simulated using the method of moments software IE3D by assuming the predetermined dielectric constant for the human muscle tissue, fat and skin. The antenna works in the Industrial, Scientific and Medical (ISM Bands, 2.45GHz). Simulated maximum gain attains −14dBi in the frequency of 2.45GHz. The radiation pattern, return loss, VSWR, Z-parameter and current distribution of these antennas were simulated and analyzed.

Design of Low Noise Amplifier for 802.16e

This work deals with the designing of low noise amplifier for WiMAX 802.16e application considering 3.4–3.6 GHz frequency band with 3.5 GHz as the center frequency. The amplifier is designed using Pseudomorphic HEMT ATF—34143 of Avago Technologies with different stabilization techniques to improve the stability of the potentially unstable device. It is observed that the noise immunity is more in source inductor degenerative stabilized HEMT than in other techniques with the help of noise figure which is obtained as 0.635 dB for HEMT. The comparative analysis of the LNA design is discussed in this paper.

Multiband SRR loaded leaf-shaped Koch fractal with a modified CPW-fed antenna

ABSTRACT In this article, a compact co-planar wave-guide (CPW) feed leaf-shaped Koch fractal antenna loaded with a circular split ring resonator (SRR) is presented. The proposed design consists of a leaf patch etched with Koch fractal (top) and an SRR loaded beneath the FR4, which are accountable for achieving multiple band characteristics, smallness, and fine impedance matching. The antenna dimension is 14×16×1.6 mm3 and is fabricated and tested. The testing results show that the design proposed, having −10 dB for 1.977, 3.19, 6.32, 8.814, 11.87, 15.69, and 18.3 GHz, respectively, covers L/S/C/X/Ku/K bands. It has good radiation characteristics for both E and H fields in all the operating bands and also it generates superior performances compared to the existing antenna in the reviews. The modified CPW-fed leaf-shaped Koch fractal SRR structure antenna is validated through negative permeability extraction and different parametric studies.

Implantable CPW-fed Z-monopole antennas at 2.45 GHz ISM band for biomedical applications

A novel coplanar waveguide-fed Z-monopole antennas are proposed for the first time for a industrial, scientific, and medical (ISM) band (2.4–2.48 GHz) applications. To make the designed antenna suitable for implantation, it is embedded in biocompatible Al 2 O 3 ceramic substrate. The antenna operates at resonance frequency of 2.45 GHz to support wide band communication for high data rate implantable neural monitoring application. The size of the antenna is 38.675 mm 3 (8.5 mm × 7 mm × 0.65 mm). The antenna was simulated and measured by immersing it in a phantom liquid, imitate the electrical properties of the human body phantom liquid. The simulated and measured bandwidths are 10.2 and 11.4% at the centre frequency. A study of the sensitivity of the antenna performance as a function of its dielectric parameters of the environment in which it is immersed was performed. The demonstration among the design EM characteristics of the antenna is presented by current distributions.