Divyanshu Upadhyay
VIT University
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Featured researches published by Divyanshu Upadhyay.
wireless and optical communications networks | 2014
Divyanshu Upadhyay; Ravi Prakash Dwivedi
In wireless communication, antenna miniaturization is a vital issue these days. This paper presents the simulation analysis of small planar antennas using different antenna miniaturization techniques. They have brought to define miniaturization methods by which we can estimate the use of micro strip antennas. Various govt. and private sector organizations made use of these techniques to solve the problem of antenna fabrication in mobiles, satellites, missiles, radar navigational aids and military applications. These techniques are used to reduce the physical size but to increase the bandwidth and efficiency of antenna. Some approaches for antenna miniaturization are introduction of slots, slits, short meandering and novel geometries like fractals or by using higher dielectrics constant. The effect of miniaturization in various antenna parameters like, radiation efficiency, gain and bandwidth are discussed. Finally the paper reports a brief description of miniaturization of antenna by using suitable and efficient methods that includes use of double layered substrate structure in microstrip patch antenna.
international conference on signal processing | 2015
Ravi Prakash Dwivedi; Divyanshu Upadhyay
In this paper, a dual band antenna is designed using fractal geometry. The paper presents a triangular sierpinski fractal antenna which gives higher bandwidth of 670MHz & 1070MHz at resonant frequencies of 10.89GHz & 15.92GHz respectively. So, the triangular patch is used in this fractal antenna which adds some extensive applications in wireless industry. The multiband and ultra wide band properties of antenna are due to their self similarity of fractal geometry while the space filling properties of antenna leads to the miniaturization of antenna. This antenna miniaturization and self similarity property of triangular fractal structure is used for reducing antenna size and for obtaining dual band resonance with high gain of 7.0954dB at 10.89GHz. The double substrate structure is used for obtaining the efficient radiation characteristics which also influences gain and bandwidth of fractal antenna. The fractal antenna is also miniaturized by introducing various iterative procedures in sierpinski fractal structure that is considered as an attempt which has been made to design an antenna of compact size and good radiation characteristics.
international conference on communications | 2015
Divyanshu Upadhyay; Indranil Acharya; Anil Kumar Gupta
In this paper a hexagonal shaped fractal monopole antenna is thoroughly investigated for UWB applications. The antenna is mounted on FR4 dielectric substrate and is fed by a 50 ohm microstrip feed line. Basically DGS and DMS structures are introduced to obtain multiband characteristics in UWB frequency range. The simulated results show stable radiation patterns and good return loss of less than -10 dB in the frequency range of 2.7-9.2 GHz. Each and every modification in the basic structure is supplemented with sufficient simulations and explanation to consolidate the results.
Archive | 2016
Divyanshu Upadhyay; Indranil Acharya; Ravi Prakash Dwivedi
In this paper a novel monopole circular fractal disk is analyzed in details. The antenna is mounted on a FR4 substrate having a dimension of 30 × 35 mm2. A 50 Ω impedance matched microstrip line is used as feeding mechanism for the antenna. The antenna exhibits stable radiation patterns and has a bandwidth of 9.64 GHz. A U-shaped slot having appropriate dimensions is etched from the patch in order to make the antenna compatible for Bluetooth applications. In the later section, different types of Frequency Selective Structures (FSS) are introduced for enhancing the gain of the antenna. A gain of 8.94 dB is observed with the introduction of slot type FSS structures beneath the ground plane. All the analysis of the antenna is done in HFSS 2013.
wireless and optical communications networks | 2015
Indranil Acharya; Divyanshu Upadhyay
In this paper, two novel star shaped fractal monopole antenna with circular and hexagon slots and semi-elliptical ground are presented for ultra-wideband applications. The designed antennas have a compact dimension of 20 × 21 × 1 mm3. A 50 ohm impedance matched microstrip feed line having width 1.9 mm is used to excite both the antennas. A wide bandwidth of 8.67 GHz is obtained starting from 4.4 GHz to 13.07 GHz with a consistent VSWR < 2 in case of a circular slot in the patch. In case of the second designed antenna with hexagonal slot in the patch, a further increase in bandwidth is obtained, having a value of 13.67 GHz in the frequency range of 4.57 GHz to 18.24 GHz. All the analysis is carried out in HFSS 2014.
international conference on computer and communication technology | 2015
Indranil Acharya; Divyanshu Upadhyay
In this paper a simple microstrip patch antenna of dimension 28 x 45 mm2 is investigated in details. Two dielectric substrates each having dielectric constant 2.2 and thickness 0.3935 mm is used thereby giving a total substrate height of 0.787 mm. A wide bandwidth of 3.76 GHz and gain of 1.32 dB is achieved. The gain of the antenna is improved in the later section of the paper by employing air substrate, triangular split ring resonators (TSRR) and modified mushroom shaped electromagnetic band gap (EBG) structures loaded in the substrate. All the analysis of the antenna is done in HFSS 14.
ieee india conference | 2015
Indranil Acharya; Divyanshu Upadhyay
In this paper, a compact printed monopole UWB antenna is presented, followed by various techniques for creating stop bands in order to mitigate interference between co-existing UWB systems. The antenna consists of a two-step beveled radiating patch and a reduced ground plane which accounts for good impedance matching from 3.1 GHz to 10.6 GHz. A wide bandwidth of 8.7 GHz is obtained between 3.5 GHz to 12.2 GHz. A comparative analysis is presented by etching out slots of various shapes near the feed line in order to effectively reject WLAN frequencies (5.15-5.35/5.725-5.8825 GHz). All the analysis for the proposed antenna is done in HFSS 2014.
global conference on communication technologies | 2015
Indranil Acharya; Divyanshu Upadhyay; Anil Kumar Gupta
In this paper, a modified fractal Sierpinski Antenna is proposed for wireless applications. The antenna under investigation is fed by a 50 ohm microstrip line. The basic shape of the fractal antenna is a triangle which is modified with a hexagon slot and iteration of self similar design. Wide bandwidth of 3.05 GHz and 2.4 GHz is obtained between 2.85-5.9 GHz and 9.5-11.9 GHz respectively. Various parameters of the proposed antenna is studied thoroughly and presented in the paper.
advances in computing and communications | 2015
Divyanshu Upadhyay; Indranil Acharya
In this paper, a planar ultra-wideband antenna (UWB) is analyzed and different methods for creating notches are adopted for efficient WLAN frequency rejection. The antenna is mounted on a dielectric substrate having a value of 3.38. The antenna has a bandwidth of 7.22 GHz and a gain of 1.13 dB. Three different novel approaches for creating notches are presented followed by their comparative study. Efficient stop-bands can be obtained in the frequency range of 5-6 GHz thereby rejecting WLAN frequency. The antenna exhibits stable radiation patterns. All the analysis is done in HFSS 2013.
advances in computing and communications | 2015
Indranil Acharya; Divyanshu Upadhyay
In this paper, a novel circular fractal antenna is analyzed in details. The antenna is mounted on a FR4 dielectric substrate having a dimension of 48 x 60 mm2. A 50 ohm microstrip feed line is used to excite the antenna. In order to realize wide bandwidth, a slot is etched in the ground. For each and every iteration, the slot dimension is adjusted in order to achieve desired results. In the later section of the paper, a U shaped slot is inserted in the microstrip feed line which leads to an effective band rejection of 1.72 GHz (5.869 GHz -- 4.149 GHz). The antenna shows stable radiation patterns and good return loss characteristics. All the analysis is done in HFSS 2013.
