https://ir.vidyasagar.ac.in/jspui/handle/123456789/312 2026-02-11T20:20:19Z 2026-02-11T20:20:19Z Bandyopadhyay, Pratap Kumar Pramanik, Sanchita https://ir.vidyasagar.ac.in/jspui/handle/123456789/908 2016-12-22T17:37:18Z 2014-03-27T00:00:00Z

Title: Appropriate Choice of Lorentzian Approximation of the Fundamental mode from different versions to study Propagation Characteristics of Single Mode Fiber Authors: Bandyopadhyay, Pratap Kumar; Pramanik, Sanchita Abstract: In this paper, we approximate the fundamental mode of guided propagation in three Lorentzian approximations (LZ0, LZ1, LZ2) sequentially with an expectation of improvements in the performance of propagation characteristics for single mode step index linear optical fiber within scalar variational framework. We show that the improvements in the performance of propagation characterics, normalized propagation constant- ( b(V ) ), group delay- ( d(V ) ) and especially wave guide dispersion ( g(V ) ) version wise in the graphical presentation. Description: 34-40

2014-03-27T00:00:00Z Roy, J Ray, S Gupta, B https://ir.vidyasagar.ac.in/jspui/handle/123456789/909 2016-12-22T17:37:18Z 2014-03-27T00:00:00Z

Title: Planar Compact Bidirectional Multi-band Fractal Antenna Authors: Roy, J; Ray, S; Gupta, B Abstract: When the system requires operation at two or more frequencies, multi-frequency antenna may avoid the use of different antennas. Applying fractal to antennas allow for miniaturization of antenna with multi-band and broad-band operation, and with that rejecting other undesired frequency bands or noise frequencies. Fractal geometries have two common properties, space filling and self similarity. It has been shown that the self similarity property of fractal shapes can be applied to the design of multiband fractal antennas and the space filling property of fractals can be utilized to reduce antenna size [8-15]. Description: 41-45

2014-03-27T00:00:00Z Ghosh, R P Patra, K Gupta, B Chowdhury, S K https://ir.vidyasagar.ac.in/jspui/handle/123456789/907 2016-12-22T17:37:17Z 2014-03-27T00:00:00Z

Title: Broad and Dualband Sierpiniski Gasket Double Sided Printed Dipole Antennas Authors: Ghosh, R P; Patra, K; Gupta, B; Chowdhury, S K Abstract: A Double Sided Printed Dipole Antenna (DSPDA) consists of two radiating arms printed on opposite sides of a dielectric. However, in place of rectangular shaped arms, triangular shape is used in to increase Return Loss (RL)/impedance bandwidth. Flaring of arms helps in gradual transition of impedance and results in increased RL bandwidth. But maximum RL bandwidth reported so far is not sufficient for high speed data application like streaming video, real time navigation, medical imaging, broadband EMI measurement etc. Maximum 10dB RL bandwidth reported with flared arms is 51% [1] and a fat PDA with higher cross polar component 10dB RL bandwidth reported is 58% [2]. Several techniques such as complicated feed structure, use of BALUN, parasitic element etc. are used to increase the RL bandwidth. But their design and fabrication are more complicated. A novel but simple designs of PDA with fractal shaped arms (Sierpiniski Gasket) are reported with 10dB RL bandwidth as high as 76% with the centre frequency of 4.2GHz. Multiband behavior of PDA has been reported by many workers [3-17]. But the impedance bandwidth obtained in each band is very small. Here we propose a novel dual band DSPDA with significantly higher bandwidth of 20% and 39% around the centre frequencies of 1.5GHz and 3.9 GHz. Description: 98-111

2014-03-27T00:00:00Z Rana, B Parui, S K https://ir.vidyasagar.ac.in/jspui/handle/123456789/904 2016-12-22T17:37:17Z 2014-03-27T00:00:00Z

Title: Design of Compact Slot Antenna Array using Half-Mode Substrate IntegratedWaveguide Technology Authors: Rana, B; Parui, S K Abstract: In this work, a novel half-mode substrate integrated waveguide (HMSIW) fed compact slot antenna array has been presented. The HMSIW structure contributes to reduce the size of antenna by nearly half compared to the substrate integrated waveguide (SIW) structure. A new type of compact slot has been introduced in the HMSIW structure which reduces the antenna size further without degrading the characteristics like gain, copolarized radiation over the principal planes and input impedance compared to those with the conventional SIW structure. At 16.8 GHz, the conventional slots (vertical slot) can not be etched within the width of the HMSIW structure as the length of slots are long enough compared to the width of HMSIW structure. Hence, two types of miniaturization techniques have been used in this design. One type of miniaturization technique has been achieved by using HMSIW and another type of miniaturization technique has been achieved by using a new type compact slot. The slot length and width have been optimized for better performance of the HMSIW. Description: 46-53

2014-03-27T00:00:00Z