Theses and Dissertations

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    Design and Analysis of Graphene Based Microstrip Patch Antenna at 7 THz
    (2021) Pala, Vidhi; Agrawal, Yash; Gupta, Sanjeev
    The need for high-speed transmission of information has extensively increased in today’s wireless and communication world. For an effective antenna design, material, and peripheral circuit to it are important parameters to attain high speed and effective transmission. It is investigated that conventional copper-based antennas are limited by various non-ideal effects at high-frequency operations. Consequently, this has triggered a lot of researches to investigate new materials that can work efficiently at high frequencies with considerable small latency and high bandwidth. It has been vividly explored that graphene is a prominent alternative to traditional copper material owing to its significantly high physical, chemical, thermal and mechanical properties. The graphene-based antennas possess high potential. However, this has been very marginally explored till date. This has been henceforward excitingly taken up in current work. In the present work, a rectangular inset-fed graphene-based patch antenna at 7 terahertz (THz) frequency has been designed. Further, the performance of graphene-based antenna is examined with different substrate materials like glass, teflon, silicon-dioxide, and quartz. It is analyzed that silicon dioxide and quartz substrates give remarkable return loss and high gain. It is also observed that if the patch is sandwiched between substrate and superstrate, then the performance of the antenna can be further improved in terms of gain and directivity. Mathematical analysis using FDTD (Finite Difference Time Domain) has also been explored for copper based microstrip patch antenna. The FDTD technique has been learnt during the project and result has been observed.
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    ItemOpen Access
    Multi band fractal antenna for satellite application
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2008) Kalariya, Vishalkumar Rameshbhai; Gupta, Sanjeev
    Fractal Antenna is the current topic for the research engineering because Fractal Technology allow us to design miniature antennas and integrate multiple band in single device. This antenna is a type of Micro strip antenna so it can be mount on the same PCB on which other RF components are mounted. There is not exact method to predict the resonance frequency of the Fractal antenna. Current research work tell that the prediction of resonance frequency of the Antenna is made from the simulation result. But in this work we try to predict the resonance frequency by mean of Network connection method. In this method each small segment of fractal shape antenna is treated as the single square patch and by analysis the separate patch and combing the total impedance by mean of Network connection method and the prediction of the resonant frequency is done by this thesis work. By using the Cavity model approach we find the impedance of the separate patch and by the Network connection model approach we can combine the total resistance and find the input impedance of the fractal antenna and we are trying to design the Multi band Fractal antenna for the L band(1.4GHz), C band(5.35GHz) and last is X band(9.65GHz) which is resonating at three band of frequency by this method.