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Design and Implementation of Circularly Polarized Antennas Using Ferrites

Bagheri, Amir Masood | 2021

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 54831 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Rejaei, Behzad; Khavasi, Amin
  7. Abstract:
  8. By the advance of wireless communication systems, requirements to more advanced systems is increased. Circularly polarized antennas are considered as a robust solution to the demands of contemporary systems because of their unique attributes. This polarization is being used in various systems like satellite communication, global navigation system, mobile communications, wireless sensors, radio frequency identification, wireless power transmission and etc. Different designs are proposed to achieve circular polarization which among them the ones using single feeding techniques are more favored because of their ease of fabrication and excitation. In this thesis, three circularly polarized antennas are proposed which all are capable of providing circular polarization at most of the fron hemisphere of the antenna. Proposed antennas are tunable in the sense of working frequency and polarization which both can be simply achieved by changing the value and direction of the applied magnetic bias to ferrite disks respectively. First proposed antenna is providing an almost wide-band behaviour and in the second one, a dual band antenna is proposed. As the first antenna is trying to decrease the number of required antennas while establishment of any wireless communication in the working frequency, the second one is trying to propose another method to establish a connection between transmitter and receiver which one band can be used for sending and another one to receive data. In a more advanced design as the third proposed antenna, the designed and fabricated structure is a full-duplex antenna which means that it is capable of receiving and transmitting data in a same carrier frequency simultaneously
  9. Keywords:
  10. Ferrite ; Full Duplex Communication ; Antenna with Circular Polarization ; Transmitter Receivers ; Dual Band Antenna ; Coordinated Transceiver Antenna ; Ferrite-Dielectric Circulator

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