Faculty Of Engineering Research Paper

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Browsing Faculty Of Engineering Research Paper by Author "12566"

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    Design of low-cost, circularly polarized, and wideband U-slot microstrip patch antenna with parasitic elements for WiGig and WPAN applications
    (Applied Computational Electromagnetics Society (ACES), 2019) Ibrahim M.S.; Department of Communications and Networks Engineering; College of Engineering; Prince Sultan University; Riyadh; 11586; Saudi Arabia; Department of Electrical Communication and Electronic Systems Engineering; College of Engineering; Modern Sciences and Arts University; 6th October; 12566; Egypt
    In this article, a well matched U-Slot Microstrip Patch Antenna (MPA) with two paratactic elements is designed and simulated. The antenna is designed to resonate at 60 GHz (V-band) and exhibits a wideband extend from 53.3 GHz to 60.8 GHz with more than 87% total efficiency. The presence of U-slot makes a current perturbation in the antenna which contributes to generate a Circular Polarization (CP). The 3-dB Axial Ratio (AR) is extended from 56 � 57.2 GHz (~ 1.2 GHz bandwidth). The analysis and optimization processes throughout this paper are carried out using Finite Element Method (FEM) and verified with Finite Integration Technique (FIT). Good agreement between the results by the two simulators is obtained. Hence, the performance of the proposed antenna makes it a good candidate for fifth generation applications at V-band like Wireless Gigabit Alliance (WiGig) and Wireless Personal Area Network (WPAN). � ACES
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    Optimized curvilinear potential field based multi-objective satellite collision avoidance maneuver
    ([publishername] American Institute of Aeronautics and Astronautics Inc, AIAA, 2019) Refaat A.; Badawy A.; Omer A.A.; Ashry M.; Egyptian Armed Forces; Cairo; 11528; Egypt; October University for Modern Sciences and Arts MSA; Cairo; 12566; Egypt; Military technical college; MTC; Cairo; 11712; Egypt
    Recently, as the incredible growth of space objects, the most important issue for nearly all centers of space mission control (MCC) try to avoid is the problem of collision avoidance and allow a free path for the spacecraft during the whole lifetime, as the problem can be broken into two main parts the first is supply by data and some organizations play this role as the SPACE DATA ASSOCIATION CONJUNCTION ANALYSIS OPERATIONS in USA and SMARTnet in Germany, the second part is our Circle of Concern to use such information for automated task of collision avoidance maneuver planning and execution. This paper develops a new technique used usually during docking operations known as artificial potential field (APF) but as the key factors before performing any maneuver in space are the fuel budget, time and the safety of the new trajectory, so a new genetic-APF is used. In this paper, a new potential field technique is used with genetic algorithm for optimizing the coefficients in the algorithm, Moreover the criteria for judging the collision is based upon the curvilinear distance between the satellites not the Euclidean distance for calculating the Time to collision (TTC), a real case study output with calculation of orbit dynamics of spacecraft using ARE_orbit_propagator, a high precision orbit propagation developed using c#, output the velocity (?v) required for each case that will be supplied to the propulsion control module is used between the Chinese �cz_4� and the United States �DMSP 5D-2 F7� satellites to clarify the difference between the traditional potential field and the new genetic-based artificial potential field with also comparing the results with the well-known Hohmann maneuver for changing the altitude. � 2019, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.