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Design and Implementation of Receiver Front-End for Ultra-Wideband Imaging Systems with Mobile Target

Andalibi, Mahdi | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57225 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Fakharzadeh Jahromi, Mohammad
  7. Abstract:
  8. In this study, we present the front end of receiving end of an ultra-wideband imaging system designed for mobile users, operating within the 10 to 20 GHz frequency range with a 10 GHz bandwidth. The choice of this specific frequency and bandwidth aims to achieve the requisite range and lateral resolution for desired imaging outcomes. Additionally, the selection of this frequency band is motivated by its favorable performance in various weather conditions and its non-ionizing nature within the microwave spectrum, prioritizing human health in the research endeavor.Despite the advantageous characteristics associated with this frequency band, designing within such a broad bandwidth and frequency range necessitates specialized techniques. For instance, achieving proper matching and gain flatness extension during the design process presents significant challenges. Moreover, the wavelength is less than 3 cm renders conventional compact circuit design principles obsolete, necessitating the consideration of new concepts like transmission lines during the design phase.The front end of the receiver system in our research is discrete and implemented at the chip level. This includes the design of a low noise amplifier (LNA) with a bandwidth of 13 GHz (10 to 23 GHz), featuring key specifications such as a P_1dB greater than 12 dBm, a maximum gain flatness better than 1.2 dB, a gain of 17.4 dB, and a noise figure of less than 2.7 dB across the bandwidth while maintaining compliance in both input and output ports. In the design of the broadband switch, criteria such as losses of less than 2.2 dB for the receiving path and 2.6 dB for the transmitting path, as well as adequate isolation between ports, are considered.Subsequently, we will address the overall implementation of the chain, including the discrete design of the receiver front end. We will then validate the measured results of both the chain and the receiver front end implemented at the board level, and provide a comprehensive comparison of their implementations in this context
  9. Keywords:
  10. Imaging System ; Broadband Circuits ; Microwave Band Pass Filter ; Low Noise Amplifier (LNA) ; Ultra Wide Band (UWB)Amplifier ; Receiver Front-End ; Imaging System Receiver Front-End ; T/R Switch

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