Zachariah C. Alex

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This paper presents a multi-fractal antenna operating in ultra wide band range for WLAN and WiMAX applications. The novel idea of multi-fractal geometry is introduced into the conventional triangular patch antenna with microstrip feed. The addition of Koch and Sierpinski fractal techniques gives rise to better impedance bandwidth and return loss(More)
This review paper focuses on the neonatal brain segmentation algorithms in the literature. It provides an overview of clinical magnetic resonance imaging (MRI) of the newborn brain and the challenges in automated tissue classification of neonatal brain MRI. It presents a complete survey of the existing segmentation methods and their salient features. The(More)
A dual band meander line wearable antenna is designed at the operating frequencies of 406 MHz and 850 MHz. Textile fabric materials were used as the antenna substrate and copper is used as radiating element. Four different types of antenna substrates were put into study. SAR (specific absorption rate) is calculated for the designed antenna using the human(More)
This paper presents the design of a high gain low noise amplifier operating in a bandwidth of .5014 GHz for wireless applications. High gain of 16.17dB is achieved at a frequency of 4 GHz. The Low noise amplifier is an electronic amplifier used to amplify possibly very weak signals. Its mostly placed at the front-end of a radio receiver circuit so that the(More)
Development of automatic voice activated low cost wheelchair using intelligent standalone controlling system and Interfaces (Embedded LabVIEW and Compact Reconfigurable Input/Output FPGA Card-cRIO-9074) for physically impaired people is presented in this paper. Various interfaces to control the powered wheelchair were proposed in the past since the voice is(More)
There is an increasing interest in military domain for wearable antennas. This paper presents the development and computation of wearable antenna which are structured into clothing. A compact Coplanar Waveguide fed (CPW) monopole antenna with dual band operation suitable for radar application is investigated. The antenna comprises the shape of a(More)
Abstract— The paper presents the design and performance measures of a printed stepped patch monopole antenna with semi-elliptical ground plane and band notch for ultra wideband applications. The proposed antenna operates in the frequency range 3.15 ~ 12.2 GHz with average gain of 4.27 dBi. Inverted U shaped slot is introduced in the feed line for WLAN band(More)
This paper presents the design and analysis of fractal antenna that contributes ultra wide band characteristics. Fractal technique is adopted to improve radiation characteristics of the antenna. The impedance bandwidth of the proposed fractal antenna is 9.4 GHz ranging from 3.2GHz to 12.6 GHz with maximum gain of 6.2dB and efficiency of 98.66%. Analysis of(More)
In this paper, Koch iteration Technique is applied to a Dipole antenna to get second iteration version of Koch fractal antenna. The performance properties of Koch fractal Dipole for 450MHZ have been primarily indicated to its fractal geometry. The Koch geometry is used to reduce the overall size of the antenna. The size of designed Antenna is reduced around(More)