Design of UHF log-periodic dipole antenna
Ultra High Frequency (UHF) has been widely used in the wireless communication of aircrafts, especially the Unmanned Aerial Vehicle (UAV). Because of the specific requirements for the aircraft, such us the wide bandwidth and small size, it is significant and practical to do the research on the UHF...
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| Format: | Theses and Dissertations |
| Language: | English |
| Published: |
2016
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| Online Access: | http://hdl.handle.net/10356/68769 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Ultra High Frequency (UHF) has been widely used in the wireless communication
of aircrafts, especially the Unmanned Aerial Vehicle (UAV). Because of the specific
requirements for the aircraft, such us the wide bandwidth and small size, it is
significant and practical to do the research on the UHF miniaturized antenna.
This thesis mainly researches on the significance of the aircraft antenna and its
research status, and then introduces the basic theory and mathematic method of the
log-periodic antenna techniques, additionally with the common methods of
miniaturization technology, which have been proposed by many experts. All these
works provide the academic foundation for the antenna design. This thesis studies the
UHF log-periodic dipole antenna (LPDA). It starts with the main parameters of the
log-periodic dipole antenna and then provides a basic antenna design. Furthermore, a
modified structure is proposed with the basic design, in which a resister is connected to
the open-end of the antenna and also a load hat is added at each end of the element to
reduce the antenna size, meanwhile broadening bandwidth. After the analysis of the
theory and design, this UHF loaded antenna is simulated on HFSS. Through the
parametric study, the parameters get optimized and the final structure is determined.
Finally, the antenna is fabricated and tested by some related equipment, with the
measurement results in good agreement with the simulated results. The miniaturized
UHF log-periodic dipole antenna designed in this thesis not only has good VSWR,
radiation patterns and high realized gain, but also has small physical size, which
satisfies the specific UAV requirements. |
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