Person: Gupta, Sanjeev
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Sanjeev Gupta
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Publication Metadata only Inclusion of Broadband Frequency Responses of Passive and Linear Networks into Circuit Solver: Simple Approach using Vector Fitting(01-03-2015) Sarvaiya, Ashish; Gupta, Sanjeev; DA-IICT, GandhinagarPublication Metadata only Design and Analysis of a Novel Multifractal Multiband Antenna using 3D-FDTD Method(01-06-2014) Dhoot, Vivek; Gupta, Sanjeev; DA-IICT, GandhinagarPublication Metadata only Multiband Fractal Antenna for Mobile & Tablet PCs covering LTE, UMTS, GSM and WLAN Applications(01-03-2015) Dhoot, Vivek; Gupta, Sanjeev; DA-IICT, Gandhinagar; Dhoot, Vivek (201021002)Publication Metadata only Miniaturized Tri-band Circularly Polarized Staired Rectangular Dielectric Resonator Antenna for Navigation Satellite Applications(EBSCO, 01-01-2022) Chaudhary, Pankaj; Gupta, Sanjeev; Jyoti, Rajeev; Mahajan, M B; Ghodgaonkar, Deepak; DA-IICT, Gandhinagar; Chaudhary, Pankaj (201521001)Publication Metadata only Design and performance comparison of a novel high Q coaxial resonator filter and compact waveguide filter for millimeter wave payload applications(WILEY, 09-04-2019) Dad, Vineet K; Gupta, Sanjeev; DA-IICT, Gandhinagar; Dad, Vineet K (201321004)A novel high-performance high Q filter with ultra-wide spurious-free stopband and thermally stable performance is introduced using higher order mode of the coaxial resonator. The 7-pole Chebyshev and a 5-pole cross-coupled filter are designed at Ka-band to validate the concept. A compact cross-coupled waveguide filter is introduced with a different approach to realize cross-coupling makes the filter compact. The coaxial resonator and waveguide resonator filter have the same configuration, and their performances are compared at ambient and over the temperature. The high power analysis is done for both these filters to find their power handling capability. The high power performance of the coaxial resonator filter is superior, and it can handle 45.525?kW peak power. This filter is suitable to be used as pre-select filter in millimeter wave payloads as well as for high power filtering applications.Publication Metadata only A novel approach for design of beam steerable aperiodic planar array antenna with reduced number of elements(Taylor & Francis, 01-04-2022) Mevada, Pratik; Gupta, Sanjeev; Chakrabarty, Soumyabrata; Mahajan, Milind; Gupta, Sanjeev; Gupta, Sanjeev; Gupta, Sanjeev; Gupta, Sanjeev; Gupta, Sanjeev; DA-IICT, Gandhinagar; Mevada, Pratik (201721006)This paper introduces the design of an aperiodic beam steerable planar array antenna using a novel strip-projection (SP) method, offering the reduced array elements with improved peak SLL with beam scan. The SP method generates the aperiodic lattice by projecting a section of the 3D body-centric tetragonal lattice onto the aperture and rotating it using Rodrigue's formula. The optimized lattice parameters are obtained using Jaya algorithm. The proposed SP method requires only three optimization parameters for any aperture dimensions and 21.9% less elements as compared to the rectangular lattice. For comparison, pinwheel-based aperiodic planar array antenna has been designed and analyzed. The peak SLL is maintainedPublication Metadata only Design of Beam-Steerable Aperiodic Linear Array Antenna With Improved Peak SLL Using Strip-Projection Method(IEEE, 01-07-2022) Mevada, Pratik; Gupta, Sanjeev; Chakrabarty, Soumyabrata; Mahajan, Milind; Gupta, Sanjeev; Gupta, Sanjeev; Gupta, Sanjeev; Gupta, Sanjeev; Gupta, Sanjeev; DA-IICT, Gandhinagar; Mevada, Pratik (201721006)This article discusses the design of the beam-steerable aperiodic linear array antenna with improved sidelobe level (SLL), using the strip-projection method. The strip projection method uses the area of rotated higher-dimensional lattice and projects it to lower dimensions to generate an aperiodic array. This article describes the modeling and analysis of such an array and its optimization for the desired far-field performance. The aperiodic arrays are also generated using various evolutionary optimization algorithms, namely genetic algorithm (GA), particle swarm optimization (PSO), and Jaya algorithms. The far-field performance of the generated aperiodic arrays is compared with the conventional periodic array. The proposed 21-element aperiodic array is also populated with a X-band electromagnetically coupled patch antenna and phase shifter designed using varying width of the high dielectric material. The aperiodic patch array antenna is also developed and characterized for various beam scan angles. A significant improvement of 5.72 dB in peak SLL is achieved at �30� beam scan angle.Publication Metadata only Baseband I/Q regeneration method for direct conversion receiver to nullify effect of I/Q mismatch(AEM, 01-11-2016) Shah, Milind; Gupta, Sanjeev; Gupta, Sanjeev; Gupta, Sanjeev; Gupta, Sanjeev; Gupta, Sanjeev; Gupta, Sanjeev; DA-IICT, GandhinagarIn this study, the effect of base-band measurement setup errors on DPD performance was investigated and a calibration procedure is developed to eliminate the measurement errors. A base-band measurement setup is prepared at laboratory with instruments and then the data which is measured and the deteriorating effect of errors on Digital Predistortion (DPD) linearization performance are investigated. In order to eliminate deteriorating effect of this error a three steps calibration procedure is developed. Before and after calibration application DPD performance is measured. It is showed both in simulation and experimentally that the calibration procedure improved the DPD system linearization performance from 10 dB to 26dB and 13dB to 20dB, respectively.Publication Metadata only Broadband planer array with switchable polarizations(Wiley, 27-07-2007) Bombale, Uttam L; Gupta, Sanjeev; Gupta, Sanjeev; Gupta, Sanjeev; Gupta, Sanjeev; Gupta, Sanjeev; Gupta, Sanjeev; DA-IICT, Gandhinagar; Bombale, Uttam L (200321001)In this article microstrip planar array of eight elements is designed and simulated. It operates in the frequency range from 3.7 to 4.2 GHz. It gives gain of 17 dB. It can produce many types of polarizations such as E?, E?, right, and left circular. In all these polarizations the cross-polar level is around 20 dB lower than the copolar level (except for E?, for E? it is around 10 dB). The novel microstrip antenna element used in this article is constructed using parasitic patch and shorting pins. It gives wide bandwidth and various polarizations due to parasitic patch and shorting pins, respectively. The array is simulated using Agilent's ADS 2003A momentum software. � 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2415�2419, 2007; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.22731Publication Metadata only Single multi-band fractal antenna for L, S, C and X-band applications(01-01-2011) Shah, Milind; Gupta, Sanjeev; DA-IICT, GandhinagarIn this paper design of single multiband fractal antenna for L,S,C and X-band application is presented. These proposed antennas are compact in size and can operate in L,S,C and X band. Here two different designs are suggested based on different feeding techniques. All designs are based on the fractal geometries. Fractals have no characteristic size, and are generally composed of many copies of themselves at different scales. These unique properties of fractals have been exploited in order to develop a new class of antennaelement designs that are multi-band and/or compact in size.