Shahanaz Ayub

E-Shaped Microstrip Antenna on Rogers Substrate for WLAN Applications

This paper presents wideband E shaped MSA for high speed WLANs operating in the 5-6 GHz range. By using the slotted edge and changing the position of the probe bandwidth equal to 14.90% is achieved. The antenna is fed by coaxial probe feeding technique. The designed antenna operates in the WLAN frequency band i.e. 5.15 GHz -- 5.35 GHz and 5.725 GHz -- 5.825 GHz which is suitable for a tourist or traveler who is travelling in different parts of the world to gain access to different WLAN specification as the transceiver containing the designed antenna will cover the frequency range from 5.15 GHz to 5.825 GHz. The antenna is designed on the rogers substrate and simulated on the Zeland IE3D software.

Dual band triangular slotted stacked microstrip antenna for wireless applications

In this paper stacked configuration of microstrip antenna is used to produce dual wide band which is suitable for various wireless applications. Using triangular slot and stacking of foam substrate of dielectric constant 1, two bands of bandwidth 18.70% and 12.10% is obtained. The antenna is fed by coaxial probe feeding technique. The proposed patch antenna is designed on the foam substrate and simulated on the Zeland IE3D software.

Dual Band Microstrip Antenna for UMTS/WLAN/WIMAX Applications

In this paper a novel compact slit loaded line fed micro strip antenna is presented for UMTS/WLAN/WIMAX lower band applications. The proposed antenna has been fabricated on glass epoxy substrate having dielectric constant 4.2. The experimental results show that the antenna can provide two separate impedance bandwidths of 247MHz (about 15.10% centered at 1.64GHz) and 634MHz (about 26.63% centered at 2.38GHz), which is best suited frequency range of UMTS(1.92-2.17GHz), WLAN(2.40-2.48GHz) and WIMAX(2.495-2.695GHz). Good impedance matching and radiation efficiency in the desired frequency bands has been achieved.

Comparative Analysis and Bandwidth Enhancement with Direct Coupled C Slotted Microstrip Antenna for Dual Wide Band Applications

This paper presents a direct coupled C slot loaded microstrip antenna which can yield wider bandwidth for WLAN/WiMax applications. The different antenna geometries are simulated through IE3D Zeland simulation software for the comparative analysis of bandwidth. The recent development technology of wireless internet access applied to the WLAN (Wireless Local Area Network) frequency bands in the range 2.40-2.50 GHz has forced demand for dual-band antennas, which can be implemented in stationary and mobile devices. The proposed antenna has dual frequency band having fractional bandwidth 3.38% (1.392-1.44 GHz) and 69.5% (1.733-3.58 GHz) which is suitable WLAN/WiMax applications. The gain has been improved up to 5.11dBi, directivity 5.39dBi and efficiency 97.216%. The proposed directly coupled microstrip antenna fed by 50 Ω microstrip feed line.

Wide Band Inset Feed Microstrip Patch Antenna for Mobile Communication

The main aim of proposed work is to obtain a large bandwidth with reduced size. The proposed micro strip antenna has a wide bandwidth covering the range from 1.806-2.978 GHz. By using new inset feed technique, wide bandwidth of 68.69% has been achieved which is suitable for Personal communication system (PCS 1.85-1.88 GHz) and IEEE 802.11b/g (2.4-2.485 GHz). The proposed patch antenna is designed and simulated on the Zealand IE3D software and the hardware of the proposed micro strip antenna is tested on the network analyzer.

Bandwidth optimization of compact microstrip antenna for PCS/DCS/bluetooth application

A novel compact broadband microstrip patch antenna is presented for various wireless applications. The proposed antenna has been fabricated and the impedance bandwidth and radiation pattern are measured. The simulated and measured antenna characteristics along with radiation pattern and gain are presented. It is stated that the proposed designed antenna can completely cover the required band widths of Digital communication system (DCS 1.71–1.88 GHz), Personal communication system (PCS 1.85–1.88 GHz) and IEEE 802.11b/g (2.4–2.485 GHz) with satisfactory radiation characteristics. The Experimental result shows that the proposed antenna presents a bandwidth 60.25% covering the range of 1.431–2.665 GHz with the maximum radiation efficiency 90%.

Design and Comparison of Digital Filters for Removal of Baseline Wandering from ECG Signal

Heart diseases, which are one of the death reasons, are among the several serious problems in this century and as per the latest survey, 60% of the patients die due to Heart problems. These diseases can be diagnosed by ECG (Electrocardiogram) signals. ECG measures electrical potentials on the body surface via contact electrodes thus it is very important signal in cardiology. Different artifacts affect the ECG signals which can thus cause problems in analyzing the ECG Thus signal processing schemes are applied to remove those interferences. The work proposed in this paper is removal of low frequency interference i.e. baseline wandering in ECG signal and digital filters are designed to remove it. The digital filters designed are FIR with different windowing methods as of Rectangular, Gaussian, Hamming, and Kaiser. The results obtained are at a low order of 56. The signals are taken from the MIT-BIH database which includes the normal and abnormal waveforms. The work has been done in MAT LAB environment where filters are designed in FDA Tool. The parameters are selected such that the noise is removed permanently. Also the best results are obtained at an order of 56 which makes hardware implementation easier. The result obtained for all FIR filters with different windows are compared by comparing the waveforms and power spectrums of the original and filtered ECG signals. The filters which gives the best results is the one using Kaiser Window.

Performance Analysis of Microstrip Patch Antenna by Varying Slot Size for UMTS Application

The main focus of this paper is to study the enhancement in bandwidth by varying the slot size in micro strip patch antenna. A wide band coaxial probe feed dual triangle slotted micro strip patch antenna has been simulated on IE3D software to give a wide bandwidth of 31.34% and maximum antenna efficiency of about 98%.The characteristics of proposed micro strip antenna such as efficiency, gain and directivity has simulated and studied in this paper and the antenna is designed to operate in the frequency range of 1.824-2.502 GHz. Here five different slot sizes are taken and it is concluded that as we increase the slot size the bandwidth increases.

Design of Digital IIR Filter for Noise Reduction in ECG Signal

Electrocardiogram (ECG) signal has been widely used in cardiac pathology to detect heart disease. A digital infinite-impulse response (IIR) filter design is proposed in this paper. This includes an implementation and evaluation of butter worth low pass infinite impulse response filter method to remove high frequency noise and for this filter is applied to noisy ECG data sample and original sample are taken as reference signal. The suggested method considers the magnitude response for choosing the cutoff frequency and the FFT spectrum estimate response to find the lowest filter order. The structure and the coefficients of the digital IIR filter are designed using FDA tool in MATLAB. The filter outputs average power before and after filtration are calculated using FFT and for simulation of this filter, the hardware is designed using micro controller At mega 16 A. For hardware designing the samples taken are record no. 108 and record no. 119 (taken from MIT-BIH database, ML II signal). Here samples are taken from MIT-BIH arrhythmia database (mitdb) ML II are used.

Abnormality Detection in Indian ECG using Correlation Techniques

The paper proposes a method based on signal processing correlation technique to find out whether the ECG is normal or abnormal. Many of the abnormal ECGs are called Arrhythmias. ECG (lead II) obtained from conventional ECG machine of Indian patients are digitized and the data are crosscorrelated with the reference standard normal ECG data. Two different beats of the same ECG data are also correlated. The correlation parameters are used to identify the ECG as normal or abnormal. The accuracy obtained in this method is 100%. The cross-correlation is done using MATLAB 7.12.0 (R2011a) tools.