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20132
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Subject: Electronics and Communication Engineering × End date: 2013 × Start date: 2013 × Type: Thesis ×
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    ThesisItemOpen Access
    A comparative study of digital integrators and application in designing of discrete filters for high speed control systems
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2013-08) Rastogi, Rohitashwa; Paras
    In the modern age of Information technology, the digital communication has a very important role. In the digital communication system to process on the discrete signals we require the discrete control systems. Digital filters are the main part of such discrete control systems. Digital filters are those electronic circuits whose gain is a function of input frequency. The frequency range for which the gain is large is called the pass band. In fact the filters are used to filter-out the desired frequencies in transmitters and receivers. The IIR filters can be designed by various methods. In modern digital communication system those filters are required whose magnitude plot is flat and it does not have any resonance peak. To design such filters the study of digital differentiators and integrators has been done and their response and deviation from the ideal differentiators and integrators is calculated. By studying different types of differentiators and applied to the low pass filter’s, high pass filter’s prototype with application of respective mathematical constraint for flat and resonance peak less magnitude response. This generated the different digital filters for different differentiators. The digital filters designed hence, compared with the analog filter for the settling time and it is observed that the Backward Euler method generates the fast settling digital filters out of all methods. By studying and analyzing the different descretization methods, it is concluded that a Backward Euler method can generate the digital filters with flat magnitude response for high speed control systems applications.
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    ThesisItemOpen Access
    Compact multiband monopole antenna for wireless applications
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2013-07) Raghuvanshi, Anoop; Gangwar, R.P.S.
    In modern wireless communication there is a huge demand of an antenna which will operate for a wide band of frequency and can simultaneously handle various wireless services. Monopole microstrip patch antennas present really appealing features like simple structure, small size and low cost. They offer a wide band of frequency and hence a prominent option for the proposed antenna designing. The structural configuration of the proposed monopole antenna design has an F-shaped slot on one side of the ground plane and a pair of rectangular and circular slot on the upper patch. The antenna is made on RT/Duroid 5880 substrate with a dielectric constant of 2.2, loss tangent of 0.0009 and a height of the substrate is only 1 mm. The actual size of the proposed antenna is only 20 ×24 ×1 mm3 and it is feed by a coaxial probe feed. After simulation three bands with a centre frequency of 3.44 GHz, 5.28 GHz and 7.12 GHz are obtained. The return loss at these resonant frequencies is -32 dB, 24 dB, and -20 dB which show a very good impedance matching. The proposed design overcomes the narrowband limitation of the patch antenna by offering a wide bandwidth of 172, 1758 and 601 MHz with an efficiency of 86%, 85% and 78%. The proposed antenna has been designed and simulated by using IE3D software and Transmission Line Model in the frequency range of 2 to 8 GHz. The performance parameters of compact multiband monopole antenna for wireless applications are improved as compared with the quoted reference antenna. The wireless applications supported by the proposed compact multiband monopole antenna are WLAN 5.8 (5.725-5.825 GHz), WiMAX 5.5 (5.25-5.85 GHz), Wi-Fi (5-6 GHz), HIPERLAN/2 (5.725-5.825 GHz), Cordless phones (5 GHz), IMT (4.4-4.9 GHz), Fixed wireless (5 GHz).