Papers by Mohammad Ashikur Rahman
IEEE, 2014
A 4-elements PIFA array antenna is designed for the laptop Wi-Fi application. The proposed array ... more A 4-elements PIFA array antenna is designed for the laptop Wi-Fi application. The proposed array antenna elements are optimized for 2.45 GHz. It is a wide band antenna. It is embedded on the back side of the laptop screen. These array elements are excited simultaneously. The performance of this antenna is analyzed and the interaction between this antenna array and user (phantom) of the laptop is studied. The VSWR and the return loss values are excellent. The SAR value lies within the acceptable limit of Federal Communications Commission (FCC). All the simulation results are performed using CST Microwave Studio 2011.
IEEE, 2013
This paper presents the design and analysis of an wideband microstrip patch antenna performance f... more This paper presents the design and analysis of an wideband microstrip patch antenna performance for Industrial, Scientific and Medical (ISM) band (2.45 GHz) applications e.g., Radio Frequency Identification Application (RFID) applications. A Flame Retardant-4 (FR-4) material is used as substrate and the size is 29 × 46 mm2. This antenna has a gain of 3.019 dB with VSWR of almost 1.3 and HPBW of about 111.3 deg. This antenna has an ultra-wide bandwidth of about 21.67% with resonant frequency at 2.4 GHz. The performance of the proposed antenna is analyzed as well as compared with various RFID reader antennas at ISM band. It is designed and simulated in CST Microwave Studio software.
IEEE, 2013
With the rapid growth of Integrated Circuits (ICs) technology, the complexity of the circuits has... more With the rapid growth of Integrated Circuits (ICs) technology, the complexity of the circuits has also increased. As a result, the complexity of the circuit demands self-testability in hardware to mitigate the product failure. Built-in-self-test (BIST) is such a technique which can meet the demand of self-testability with an effective solution over costly circuit testing system. This paper represents designing and implementation of a Universal Asynchronous Receiver Transmitter (UART) with self-testing ability. In order to attain compact, stable and reliable data transmission, the UART is designed with Verilog HDL language and synthesized on Spartan2 FPGA. Here, the Baud Rate of the UART is 4 Mbps. This UART also utilizes the RS-422 standard.
IEEE, 2013
In the rapid progress of commercial communication applications the development of small integrate... more In the rapid progress of commercial communication applications the development of small integrated antenna has an important role. Planar inverted-F antennas (PIFAs) are commonly used as handset antennas. This paper presents the analysis on the performance of single band PIFA antenna for handsets. Different specifications of the proposed antenna are measured through computer simulation in free space as well as in the presence of human head model. The Specific Absorption Rate (SAR) is also measured for this antenna and how the antenna interacts with human body that is also observed. All simulation results are performed using the CST Microwave Studio.
Conference Papers by Mohammad Ashikur Rahman
Applied Computational Electromagnetics Society (ACES), 2014
An ultra-wideband microstrip patch antenna prototype designed on a Flame Retardant-4 (FR-4) subst... more An ultra-wideband microstrip patch antenna prototype designed on a Flame Retardant-4 (FR-4) substrate with a dielectric constant () of 4.3 is presented in this paper. Performance of this antenna and human body interaction is also analyzed. The proposed antenna with a compact area of 44×66 mm , has an ultra-wide operating bandwidth. This antenna covers the whole band of the Mobile WiMAX IEEE 802.16e-2005 standard at 3.5 GHz (frequency range 3.4–3.8 GHz). The antenna has a maximum gain of 4.014dB. The maximum Specific Absorption Rate (SAR) is 0.0727 W/kg averaged over 10g of tissue and 0.138 W/kg averaged over 1g of tissue which very low and far below the acceptable limit. The proposed antenna is designed and simulated in the CST Microwave Studio software.
In the proceedings of International Conference on Electrical, Computer and Telecommunication Engineering (ICECTE) 2012, Dec 1, 2012
Traffic Congestion is one of the severe problems in heavily populated countries like Bangladesh w... more Traffic Congestion is one of the severe problems in heavily populated countries like Bangladesh where Automated Traffic Control System needs to be implemented. An FPGA-based Semi-automated system is introduced in this paper including a completely new feature “Safe State” to avoid sudden unwanted collision. Here we used sequential encoding which has made the program much simpler and so that easy to control and modify. The experimental result showed the automated change in traffic lights according to the specified timing sequences which would be able to conduct maximum possible transitions of vehicles occur at different directions simultaneously without facing any accident.
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Papers by Mohammad Ashikur Rahman
Conference Papers by Mohammad Ashikur Rahman