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| dc.contributor.author | REHOBOT, BEKELE BURUSO | |
| dc.date.accessioned | 2022-11-18T07:12:40Z | |
| dc.date.available | 2022-11-18T07:12:40Z | |
| dc.date.issued | 2022-03 | |
| dc.identifier.uri | http://ir.bdu.edu.et/handle/123456789/14465 | |
| dc.description.abstract | Modern satellite communication demands cutting-edge antenna technology capable of operating over ultra-wideband and less complexity in the hardware. This thesis presents a frequency reconfigurable microstrip antenna flexible by RF switch over the C, X, and Ku bands using a simple patch antenna configuration and a single microstrip feed line. This thesis studied three types of antennas: the meandering line, the circular ring, and the annular ring. A miniature meandering line antenna with a 24mm x 24mm x 3mm dimension was designed using the differential spacingmethod, and the simulation showed wide operating bands at 6.8 GHz, 9.3 GHz, 15.5 GHz, 20.53 GHz, and 22.5 GHz. In addition, good impedance matching, radiation efficiency of 80–100%, and bandwidth greater than 1 GHz were attained while three MA4AGBLP912 diodes switched ON and OFF to control the current path. At the same time, the circular ring method was analyzed using the fundamental resonant mode (TM11 mode) of the circular radius patch antenna. As two diode states are altered, an antenna is given quad-band frequencies at 5.4-6.6, 8.7-9.6, 14.8-17.05, 17.8-19.6GHz, and an axial ratio of less than 2 dB. All bandwidths higher than 1GHz and a gain of 5.5–6.7 dBi are obtained. Annular ring analysis is determined by optimizing outer and inner radius in all four diode states: 4.1–5.9, 5.97–7.1, 10.1–13 GHz, 17.08–18.2 GHz, or 20.5–21.9 GHz with VSWR less than 1.2 over wide beamwidth in all switching cases (1-2 GHz). In general, good impedance matching (VSWR < 1.5) at peak gain of 8dBi with maximum 4–7.8 dB directivity and low sidelobe with stable radiation patterns and an axial ratio of less than 3dB is achieved in all satellite bands (C, X, Ku, andK). However, in the Super High Frequency (SHF) application, the proximity of the radiating surface causes mutual coupling due to the shortest wavelength of frequency. In the aspects of radiation efficiency, directivity, VSWR, and bandwidth, all proposed techniques provided superior performance and controllable resonant frequencies over a wide range of satellite bands. Keywords: Reconfigurable, Satellite Band, PIN Diode, Annular Ring Antenna, Mean-dering Antenna, Return Loss, VSWR | en_US |
| dc.language.iso | en_US | en_US |
| dc.subject | Faculty of Electrical and Computer Engineering | en_US |
| dc.title | CIRCULAR RING FREQUENCY-RECONFIGURABLE MICROSTRIP ANTENNA FOR MULTIPLE SATELLITE APPLICATIONS | en_US |
| dc.type | Thesis | en_US |
