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X-ray sensitivity of semiconducting polymer poly(triarylamine) (PTAA) based direct conversion X-ray detectors is determined for mammography application considering drift of charge carriers in the presence of deep traps. Using COMSOL Multiphysics 5.0, the continuity equations for charge carriers are solved considering proper initial and boundary conditions. For mammography, the calculated X-ray sensitivity...
In this paper it has been showed that the Radio Frequency Identification (RFID) has been utilized in an inexpensive, reliable, flexible, and scalable manner for object detection and positioning. We have designed a system with 125kHz RF module which not only can detect the object but also give the actual position of the object. Radio signals are being transmitted and received by the reader after that...
An analytical approach is presented to evaluate the bit error rate performance of a MIMO power line communication system taking into account the power line noise which is non-white and impulsive in nature. Transfer function of the 2×2 MIMO power line is considered and BER results for a binary PSK link is evaluated numerically for different power line parameters. The result show that there are significant...
We have designed Al0.8Ga0.2N-delta-GaN Quantum Well (QW) Laser to investigate the performance characteristics of device like square momentum matrix element at zone center, spontaneous emission rate and optical gain, with structural parameters like delta width, well width, barrier width and injection carrier density. A Self Consistent model using 6-band k.p method incorporating strain effect due to...
In this paper a planar microstrip antenna with dual stop-band functionality is presented for ultra-wideband application. The proposed design comprises a radiating patch and partial conducting ground and printed on double sides of FR4 dielectric substrate material. To attain dual stop band functionality, two parasitic slits are etched below the radiating element along with the ground plane. Experimental...
In this article, impersonation experiments were conducted utilizing natural morphed speeches between (/a/-/b/-/a/) and (/a/-/g/-/a/) as stimuli. The sound stimuli are produced utilizing the natural glottal source and morphed linear predictive coding (LPC) filtering coefficients, which represent the vocal tract states. An algorithm has been proposed for determination of impersonation quality based...
We propose quantum cascade thermophotovoltaic structures based on intersubband transition for efficient energy conversion using GaN/AIN material system. Four designed structures combinedly absorb a broad range of blackbody spectrum from 1300 K to 2000 K, including higher energy portion of the blackbody radiation. Optimized design of relaxation path ensures efficient collection of photoexcited carriers...
The propagation properties of plasmon polaritons considering the effect of a lower index dielectric coating on metal stripe have been analyzed in this work by using a vector finite element method (FEM). The coating layer in the structure can reduce the propagation loss significantly for both symmetric and asymmetric modes without altering the 2D sub-wavelength power confinement much in the metal stripe...
This paper attempts to investigate the ionosphere over Bangladesh for the first time and presents a comparison of the International Reference Ionosphere (IRI-2012) with the peak ionospheric characteristics (foF2-hmF2) and electron density profiles (EDP) measured by radio occultation (RO) missions. In absence of systematic ionosonde measurements over this area, RO measurements provide an opportunity...
The microwave and optical parameters of a ridge type polymer electrooptic modulator have been studied in light of the changes in different structural parameters. The quasi-static finite element technique is used to obtain the potential distribution as solution of Laplace equation over the cross-sectional domain. Thus the microwave field, power, effective index and characteristic impedance have been...
Pickett-Potter horn reflector antenna is very popular in applications where a radiation pattern with suppressed side lobes and equal E-beam and H-beam widths are required. In this paper, for 8.7 GHz, we optimize three parameters such as step transition, conical horn length and aperture length of Pickett-Potter horn reflector antenna to increase bandwidth level. We design and test the antenna within...
A new optical type pressure sensing system is proposed in this paper. Bellows, an elastic type sensing element is used to indicate the pressure in the form of displacement of bellows element. For automated process industries, the signal is required to be send to a remote location like control room. In order to send the mechanical movement of bellow corresponding to the applied pressure, to a control...
This monograph explores a new photonic crystal fiber (PCF) design on triangular lattice (TL) pattern for tailoring ultra flat chromatic dispersion near-zero level with high birefringence. The guiding properties of the TL-PCF are defined by applying anisotropic perfectly matched layer (PML) absorbing boundary in the finite element method (FEM). Our proposed TL-PCF is suitable for the application of...
Due to low cost, low power consumption and better on-chip functionality CMOS Image Sensor has become the main image sensor for consumer electronics, machine vision as well as in research applications. Besides the advantages, a CMOS image sensor suffers from noises, less sensitivity as well as lacks of Dynamic Range (DR). Logarithmic response Active Pixel Sensor (APS) is a solution for wide dynamic...
In this paper we present the results of analytical and numerical studies on the effect of change of permittivity of embedded defects on the transmission characteristics of epsilon-near-zero (ENZ) metamaterials. We investigated electromagnetic wave transmission in the microwave regime through an isotropic ENZ metamaterial-based waveguide embedded with rectangular defects. We found that by adjusting...
In this paper, we report the spectrum occupancy measurement for cognitive radio purpose in Dhaka city for a period of 16 hours of the frequency bands in 0–3 GHz. We provide visual representation of the relations between frequency and corresponding power level as well as we compute duty cycle. The duty cycle from the measured data is obtained as 19%. This is the first of these kind of measurements...
This work gives the information of performance analysis of Z shape Microstrip Patch antenna design by using different dielectric substrate materials, substrate thickness and arm gap of patch, to operate in the frequency range of 0.6 GHz to 2 GHz. By comparing different substrates material and thickness, a suitable substrate has been selected to design Microstrip patch antenna. This proposed design...
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