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Redesign and Analysis of Deployment Mechanism for an Antenna on a CubeSat

Khaloujini, Amir Masood | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58379 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Alasty, Aria; Vossoughi, Gholamreza; Talaeizadeh, Amin
  7. Abstract:
  8. The use of deployable antennas has grown significantly in space systems due to their capability to be stowed within launch vehicles and achieve high gain. These mechanisms must feature low structural complexity, low mass, a large effective aperture, compact stowed dimensions, and sufficient strength and stiffness to prevent frequency resonance during launch and withstand stresses imposed by the launcher. This research aims to design a deployable mechanism capable of forming the parabolic surface of the antenna with higher precision and simplicity while meeting launcher requirements. After reviewing existing mechanisms and deriving mission and space requirements, the antenna design specifications were defined, and an innovative preliminary design was proposed. Modal analysis using ANSYS was conducted to select the connection location so that the first natural frequency exceeds the excitation frequency of the launcher. Acceleration loads, random vibrations, and dimensional optimization were applied to enhance the mechanism’s resistance to stresses, while a suitable spring system and kinematic and dynamic analyses were used to evaluate its deployment performance. The results demonstrated that the designed mechanism can withstand launch conditions and operate effectively in orbit. Finally, a laboratory prototype was fabricated to validate the technology, and challenges associated with the integration process were investigated
  9. Keywords:
  10. Parabolic Antenna ; Curved Scissor ; Scissor-Type Mechanism ; Deployable Antenna ; Deployable Mechanism ; Cubesat

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