Theses and Dissertations

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Author: search.filters.author.Dhoot, Vivek

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    Design and analysis of multiband fractal antenna
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2015) Dhoot, Vivek; Gupta, Sanjeev
    Miniaturized Multiband antenna design is an important and challenging task for communication industry. Several constraints like size, position of the antenna, feasibility, reflection coefficient, Specific absorption Rate (SAR), make it more difficult to design a multiband antenna. Current trend suggests that one device (Mobile, Tablet PCs etc.) should cover multiple communication applications (Like GSM, LTE, Bluetooth, Wi_ etc.). It implies that antenna design should not only satisfy the constraints but also cover wide multiband range. In this research work, design, analysis and measurement of fractal antennas, are carried out, for such multiband applications. Revised cantor geometry is proposed for antenna design, which produces more than 5 resonances in second iteration only (feasible design). The three dimensional Finite Difference Time Domain (3D-FDTD) Method is used for analyzing the reflection coefficient of the antenna. Revised cantor geometry based compact, low profile LTE fractal antenna is proposed here, for Mobile and Tablet PC applications. The proposed antenna is appropriately covering several wireless applications, including LTE 1.7-1.8 GHz band, 2.3 GHz, 2.6 GHz and 2.9 GHz applications, WLAN 2.4 GHz and 5.8 GHz applications, GSM, UMTS, DCS, ZigBee, PCS, applications. This antenna is designed and analyzed using MATLAB code based on 3D FDTD method. Antenna finger dimensions are optimized using observations in MATLAB and CST Studio Suite. Radiation Patterns show, for all the observed frequencies, Directivity between 7.72 dBi to 8.17 dBi and Radiation Efficiency, within the range of -0.98 dB to -1.95 dB. Experimental reflection coefficient results present accurate matching with theoretical results. Theoretically analyzed SAR is less than 1.6 W/kg for 10 g tissue, without mobile circuitry. SAR reduction technique is also been presented.

    In addition to this, fractal antenna on substrate with high dielectric constant, fractal antenna array design and integrated antenna designs, are also studied, as part of this work.

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    ItemOpen Access
    Radiation analysis of microstrip active (amplifier) and passive (antenna) structures
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2010) Dhoot, Vivek; Gupta, Sanjeev
    Analysis of radiation from a microstrip amplifier and a newly proposed microstrip antenna is presented. Microstrip amplifier is analyzed replacing the MMIC structure by an equivalent S2P model and remaining portion being constructed with the original dimensions. A printed monopole antenna using multifractal technique is proposed. This antenna has multiband characteristics covering various wireless applications including WLAN 2.4 GHz and 5.8 GHz applications