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Evaluation of the RF Link in the Starlink Satellite Network and Analysis and Simulation of Phased Array Antennas used in this Network

Dibaj, Alireza | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57931 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Farzaneh, Forouhar
  7. Abstract:
  8. In this thesis, the radio link of the Starlink satellite communication system is examined and analyzed. Initially, the general characteristics of the system such as the number and type of satellites, speed and orbital parameters, frequency bands, modulations, multiple access methods, and duplexing techniques are described. Subsequently, the analysis and simulation of the phased array antenna in the user segment are addressed. This includes: 1) Estimation of \varepsilon_r and the thickness of substrates through the analysis and simulation of transmission lines used in the printed circuit board using CST and ADS software, 2) Analysis and simulation of a single antenna element by CST software, covering aspects such as radiation pattern, directivity, polarization, the unwanted coupling effects of two adjacent antenna elements, return losses in both transmission and reception modes within the antenna’s operating frequency range, 3) Analysis and evaluation of the antenna array, which involves the study of elements arrangement, phase control mechanism, and beam steering by the beamformer, obtaining the array factor using MATLAB software at different angles \theta_0 and \varphi_0, calculating the overall directivity of the antenna array using element factor and array factor data at different \theta_0 and \varphi_0 angles at central transmission and reception frequencies, calculating the antenna’s equivalent noise temperature at different \theta_0 and \varphi_0 angles, 4) Extraction of the receiver antenna block diagram and user end schematic, 5) Examining the fundamental parameters of the radio link between the satellite and user, such as the signal-to-noise ratio in the uplink and downlink, bit error probability in various modulation schemes used in the network, the maximum communication capacity of each satellite channel, and other link-related parameters
  9. Keywords:
  10. Satellite Communication ; Phased Array Antenna ; Beam Shaping ; Signal to Noise Ratio ; Bit Error Rate ; Beam Steering ; Array Factor ; Starlink ; Equivalent Noise Temperature ; Return Losses ; Directivity Polarization ; Radiation Pattern ; Geostationary Orbit Satellites (GEO)Satellites

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