Browsing by Author "Saha, Pran Kanai"

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Design and Analysis of Impulse Radio (IR) Based UWB Transmitter with Antenna
(Research and Development Wing, MIST, 2022-12) Shantona, Shanjida; Saha, Pran Kanai; Tawfiq Amin, Md.
The use of ultra-wideband (UWB) in target detection, radar and wireless connectivity, specifically in the medical world, has attracted a lot of attention. The concept that the IR-UWB system does not necessarily require carrier signals is one of its most appealing features. IR-UWB can transmit information using short Gaussian monocycle pulses. In light of these advantages, this paper proposes a novel UWB transmitter system which consists of UWB signal generating circuits and UWB antenna, which work together to create entire UWB transmitter. It is based on impulses and has a simple architecture with low power consumption. The proposed transmitter is realized in Cadence tools with 90nm CMOS technology and proposed UWB antenna is simulated using Advanced Design System (ADS) simulator software. In addition, the transmitter circuit and the antenna are co-simulated using ADS software. The illustrated UWB transmitter uses a low-power supply and generates pulse amplitude with pulse duration of for the Gaussian monocycle pulse. Due to its increased output voltage swing and reduced power consumption when comparing to other circuits, the proposed architecture is functional and suitable for use in short-range wireless networks and medical applications.
Design and optimization of an UWB microstrip patch antenna using dielectric substrates Duroid 5880 And FR4
(BRAC University, 2014-01) Chowdhury, Nusrat Tasnufa; Chowdhury, Dilruba; Saha, Pran Kanai
No longer new in wireless technology; the ultra wide band (UWB) radio transmits large amounts of digital data over a wide spectrum of frequency bands (>500MHz) at distance up to 230 ft at very low power (< 0.5 mW), As well as can carry signals through doors or obstacles; that tend to reflect signals at limited bandwidths and at higher power. The low power spectral density limits the interference potential with conventional radio systems. High bandwidth can allow very high data throughput for communication, or high precision for location and imaging devices. The Shannon‟s Theorem given by, Channel capacity; C= B. ln(1+ SNR); Where, B is bandwidth shows us that the channel capacity increases with the channel bandwidth. Design and development of a rectangular micro strip slot patch antenna for short distance ultra wideband communication has been demonstrated in this project. Different antenna family for wide band communication has been studied. Suitable antenna architecture is to be proposed for ultra wide band application analyzed using HFSS 15. Result required 1 GHz bandwidth for the applied substrate thickness 5 mm and resonance frequency 5 GHz, the impedance matched and voltage standing wave ratio (VSWR) closest to 1. However, using different sizes, shapes, allocation and number of slots on patch to obtain the foremost required bandwidth for UWB application was the challenging part. The architecture has been developed to transmit over a bandwidth of 0.96 GHz which is close to required 1 GHz, having VSWR of 1.2202. Further modifications of the design can optimize the antenna for best result.
DESIGN OF A MICROSTRIP PATCH ANTENNA IN A SILICON SUBSTRATE USING HFSS
(R&D Wing, MIST, 2010-02) Nabila Nikhat, Shamma; Rashid, Rimi; Rayhan, Sajeeb; Saha, Pran Kanai
The aim of this paper is to design a compact microstrip patch antenna for use in wireless/cellular devices. A typical cellular phone measures about 14.5 cm by 4.5 cm. Hence the antenna designed must be able to fit in such a cellular phone. A compact microstrip patch antenna has been successfully designed having a center frequency of 1.9 GHz. The ground plane dimensions for the patch antenna have been designed to be 31 mm by 40 mm and the patch dimensions are 22 mm by 31 mm. This is designed and simulated in High Frequency Structure Simulator (HFSS-9.2) of Ansoft Corporation.
Microcomputer Based Dish Antenna Position Control System
(IEEE, 1998-12-18) Saha, Pran Kanai; Ahsan, Syed Shabiul; Bhuyan, Muhibul Haque; Islam, Kamarul; Alam, AHM Zahirul
This paper presents a microcomputer-based control system to position a small dish antenna at a desired elevation and azimuth angle for maximum power reception from the satellite. Here satellite position is used as an input of the system. Two dc motors (one for azimuth position while the other for elevation position of the antenna) are used to position the dish antenna. Continuous pulses are sent to the motor control circuit through the parallel port of the computer to move the dish to the desired position. A prototype dish antenna is constructed and then positioned by using the developed control system. Results show a very good agreement between the desired position and the actual position of the dish antenna.
Microcomputer Based Dish Antenna Position Control System with Autocalibration Option
(IEEE, 2005-12-28) Bhuyan, Muhibul Haque; Saha, Pran Kanai
This paper presents a microcomputer-based control system to position a small dish antenna at a desired azimuth and elevation angle. The desired angle of rotation is the input data of the system. Two dc motors (one for azimuth position while the other for elevation position of the antenna) are used to position the dish antenna. Signals are sent to the motor control circuit through the parallel port of the computer. Due to aging, the component behavior of the motor control circuit may change, and as no feedback system is included auto-calibration system has been incorporated with the system so that the system can be freshly calibrated at any time. A prototype dish antenna is constructed and then positioned by using the developed control system. Results show a very good agreement between the desired position and the actual position.