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Design and Analysis of Microwave Frequency-Reconfigurable Antennas Based on Handedness Preserving Metasurfaces

Motalebi, Amir Hossein | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54829 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Memarian, Mohammad
  7. Abstract:
  8. In the last two decades, reconfigurable antennas have attracted significant research attention. Utilization of such antennas can lead to decrease in cost and power consumption in modern communication systems. The main focus of efforts is on frequency reconfigurability using different mechanisms while maintaining desirable antenna characteristics over the tuning range. In this thesis, our goal is to design, analyze and fabricate a reconfigurable antenna based on the concept of polarization standing wave (PSW) in the X band using only a simple physical tuning mechanism. Two anisotropic handedness preserving mirrors (AHPM) are placed at both ends of a cylindrical cavity resonator, thus stablishing a PSW mode. The resonance frequency of the PSW mode can be tuned by rotating any of these AHPM end walls. A novel AHPM is presented which provided perfect handedness preservation using a dielectric binary grating (DBG) structure. Utilization of such AHPMs provides an antenna with excellent reconfigurability and radiation characteristics. In addition, a frequency reconfigurable antenna based on a strip patch array (SPA) structure is then designed and fabricated to demonstrate the feasibility of the tunable antenna. To further improve the radiation pattern, an electromagnetic bandgap (EBG) superstrate was implemented to suppress any surface waves and/or currents within the tuning frequency range of interest. Measured results show that the fabricated antenna has a tuning range from 10.64 GHz to 11.52 GHz. PSW cavity antennas assisted by AHPMs are thus shown to achieve a desired tuning range suitable for antennas and possibly other cavity based microwave devices
  9. Keywords:
  10. Mushroom Structure ; Handedness Preserving Mirror ; Reconfigurable Antennas ; Polarization Standing Wave ; Power Consumption

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