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Reducing Mutual Coupling between Millimeter Wave Antenna Arrays Using Metamaterial Absorbers

Ghaffarzadeh Derakhshan, Hamed | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51781 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Akbari, Mahmoud; Memarian, Mohammad
  7. Abstract:
  8. Antenna arrayss have long been utilized in many applications including communication, radar, and imaging. With the advancement of the telecommunication industry and the emergence of new requirements in the fifth generation of telecommunications, imaging and the Internet of Things, new antenna arrays are designed at higher operating frequencies and with particular specifications. One of the major challenges in using these types of antennas is unwanted mutual coupling in these systems. These couplings can occur between the antenna elements of the array itself, or between two or more arrays that are adjacent to each other. These couplings can seriously affect the performance of the system. Coupling of electromagnetic fields between transmitter and receiver arrays reduces the level of image quality reconstructed in an array based imaging system. In this research, we aim to devise methods to reduce such types of couplings, in a mm-wave imaging system. The coupling reduction however must be perfomed such that the antenna specifications are not significantly altered. The goal of this project is to reduce inter-array coupling level using planar structures in the 28GHz band, with minimal effects on the antenna performance. These structures are positioned between transmitter and receiver arrays in the imaging system, acting as electromagnetic absorbers in the working bandwidth. Several methods and designs are proposed, including the use of resistive sheets as well as Frequendy Selective Surface and metamaterial structures, made up of multiresonant metalizations on a multilayer substrate. The designs aim to address challenges such as dependence of the resonant frequency and the absorption rate on the change in the polarization angle and the angle of incidence. Several designs are carried out in theory and simulations, and one design is also fabricated and tested
  9. Keywords:
  10. Antenna Array ; Imaging ; Electromagnetic Absorption ; Frequency Selective Structure ; Bandstop Filters ; Coupling ; Metamaterial

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