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Circularly Polarized Broadcast Array Antenna (2009)

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Thesis Archive

Circularly Polarized Broadcast Array Antenna (2009)

Cruz, Robert Anthony M., Enero, Nob Dek.S., Samonte, Francis Edgar Samonte O., advised by Engr. Gerald Arada

Abstract:

-It is indeed a fact that communication is one of the most important aspects in our lives. Cellular technology is the most common form of communication that people use at present. Almost all of the people have cellphones which they use to stay in touch with their relatives and friends. The most common problem that cellular subscribers encounter is having poor reception in some areas. This may be due to the fact that signals tend to change its polarization as it is propagated. Since cellsite antennas are dual polarized, receive and transmit antennas are only linearly polarized. With the new antenna design, circular polarization is employed to ensure that the polarization of the signal would not matter since it will be received by the antenna. Another novel feature of this antenna is having the ability to reshape its radiation pattern. This is very helpful because when the owner of an antenna would opt to vary the radiation pattern, he must look for another antenna with the radiation pattern that he desires but with this antenna design, the radiation pattern can be changed without having the necessity to look for or buy another antenna. The thesis group conducted simulation, using FEKO, and actual measurements, using an open field testing. There are three radiation patterns that were obtained using the antenna designed by the group: omnidirectional, bidirectional, and cardioid. Varying the spacing between two adjacent elements and using either single or four elements are ways to reshape the radiation pattern of the antenna. Also, the polarization of the antenna was verified to be circular since the axial ratio that was obtained was approximately equal to unity.

 

Correspondence:

Engr. Gerino P. Mappatao
[email protected]

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