Browsing by Author "Chakraborty, Samik"

Now showing 1 - 6 of 6

Annular ring microstrip antenna for body-worn applications /
(IEEE, 2010-12-01) Chakraborty, Samik
The concept of being connected anywhere and everywhere is the main driving force for developing and researching the potential Wireless Body Area Networks operated in WLAN and HiperLAN bands. This paper presents design, development and evaluation of a fully fabric annular ring microstrip antenna suitable for wearable applications in WLAN band. Both simulated and experimental results on the performance characteristics of this antenna are presented.
Bandwidth analysis and optimization of ð§ shaped microstrip patch antenna with artificial neural network /
(Innovative Space of Scientific Research Journals, 2017-09-02) Chakraborty, Samik
In this paper an artificial neural network optimization technique and models is used for analysis the bandwidth of Microstrip antenna. The Ч shaped Microstrip patch antenna designed and use operating frequency 6.83 GHz to analysis the bandwidth of antenna. Artificial neural network models used and varying the different parameters of Microstrip antenna to measure the bandwidth and its results is compared with artificial neural network results. The most common dielectric substrate Polyethylene =2.25. ANN is vey suited for analysis the proposed antenna and gives more easy calculation and design of microstrip patch antenna.
Improvement of lubrication and cooling in grinding
(Taylor & Francis, 2017-08-10) Chakraborty, Samik
The presence of air boundary layer around a grinding wheel impedes the proper entry of cutting fluid into grinding zone and thereby lubrication and cooling are hampered. It leads to the thermal damage to the workpiece and rapid wheel wear. This experimental work is aimed at increasing the lubrication and cooling effects in grinding by a novel method of using scraper board. The experiments are conducted, using the scraper board, to find the critical region where the air pressure is zero. The coolant jet has then impinged into the grinding zone which is maintained within the critical region. The requirement of specific energy, surface texture, and mechanical properties of the ground surface are analyzed and compared with the traditional grinding and the grinding at various positions of scraper board. Results show that the grinding ratio improved by 35.6and 119%, surface roughness decreased by 36 and 54.2%, while the requirement of specific energy is reduced by 50.8 and 57.3% when scraper board is positioned at the critical distance in comparison to the 57.5° position and no scraper board, respectively. The results indicate that the introduction of fluid in the present method can improve the process efficiency and the product quality effectively.
Modelling of air boundary layer around the grinding wheel /
(Taylor & Francis, 2018-12-28) Chakraborty, Samik
This paper establishes the models of rotating air layer to predict the pressure of the air around the solid and grinding wheel of different dimensions and rotating at different speeds and finds the factors affecting the flow. Initially, a theoretical model has been developed from the Navier–Stokes (N–S) equation and compared with the experimental values at each stage. Results show that the effects of two proposed novel effect, namely ‘compensating air’ for the solid wheel and ‘Majumdar-air’ for the grinding wheel, along with the effect of surface and centrifugal force are responsible for the additional growth of air. The effects of ‘compensating air’ and ‘Majumdar-air’ near the wheel surface have been found to be 33% and 66% of the total pressure for the solid and grinding wheel of the same dimension, respectively, rotating at 2880 rpm. These two effects are responsible for a significant deviation of the experimental data from the theoretical model. Further, the theoretical model has been modified by introducing a correction factor in the equation. Flower Pollination Algorithm (FPA) has been used to optimize the parametric values of the modified model with a minimal error. The output of the modified model has been found consistent with the experimental result.
Performance enhancement of slotted shaped microstrip antenna for wireless communication /
(IEEE, 2013-12-01) Chakraborty, Samik
This paper describes the enhancement of rectangular patch for GSM band of frequency 5.3 GHz. An I-slotted Microstrip patch antenna has been designed and simulated using IE3D 14.10. The proposed Microstrip Patch antenna is designed to support modes with resonance at 5.3 GHz and it was found that an increase of bandwidth of 20.45 % and achieved gain is 7.25 dBi. The antenna design and performance are analyzed using Zealand IE3D software(VSWR≤2).The antenna can be used for many modern communication systems.
Variation of resonant frequency of a rectangular microstrip patch antenna due to accumulation of water over its surface /
(IEEE, 2010-08-01) Chakraborty, Samik
In the work presented here, the effect on the resonant frequency of a rectangular microstrip patch antenna-due to accumulation of water over its microstrip patch surface-during rainy seasons is studied. A probe-fed rectangular microstrip patch antenna having dimensions 84 mm × 70 mm (W × L), fabricated on the Duroid® substrate (εr = 2.4) of thickness 1.524 mm (60 mill) and resonant frequency equal to 1.34 GHz, is used for the experiment. The antenna is assumed to be in outdoor condition such that the microstrip patch surface lies horizontal so that water may be accumulated over its surface during rainy conditions. This effect is emulated by pouring distilled water over the antenna patch surface to form a water layer of uniform thickness successively of 1 to 5 mm-and its effect on the resonant frequency of the antenna is observed. An empirical relation between percentage change in resonant frequency and the height of water layer over the rectangular microstrip patch antenna surface is presented.