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Design and Implementation of Amplitude Detection Method for Millimeter Wave Imaging

Sepehripour, Fahimeh | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51443 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Khavasi, Amin; Fakharzadeh, Mohammad
  7. Abstract:
  8. Conventional imaging systems composed of two linear arrays of antennas as a transmitter and receiver. These arrays of antennas electronically scan along their antenna elements and are mechanically moved along a second orthogonal direction for scanning large two-dimensional areas quickly. In this thesis, the transmitter antenna elements are Tapered slot-line Antenna operating at 20-30GHz. A multiplexer circuit is used to transmit wideband signals to each antenna in the array. The receiver is composed of Schottky diode and pick up antenna that they are printed onto the radiating end of the antennas on the edge of the transmitter circuit board.In the available imaging systems, for achieving the high quality reconstructed image they had to be phase-referenced to the antenna aperture. So, they require primarily phase reference for the calibration process in the operating frequency range. This receiver is less complex to process than traditional microwave receivers because they require no phase calibration. However, the calibration procedure is a tedious endeavor in particular for arrays with a large number of elements. Additionally, any drifts in the system, for example, caused by temperature variations, can adversely affect the calibration. This imaging system does not have any calibration problems for phase referencing since by new method of design and changing the system structure especially in receiver part and the distinctive structure of the transmitter and receiver antennas. This method reduces the cost, improves image quality, and renders it portable due to the simplicity of the microwave circuitry.A controller board is designed to facilitate electronic scanning along the arrays and route measurement data to a PC for storage and image reconstruction. In the final imaging system, the image of the several different objects has been reconstructed that the quality of the reconstructed images represents the capability of the proposed method
  9. Keywords:
  10. Millimeter-Wave Imaging ; Image Reconstruction ; Schottky Diodes ; Monostatic ; Holography

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