Proposal Title

Revolutionary Size Reduction of a Circularly Polarized, Log Periodic Dipole Array

Primary Faculty Mentor’s Name

Dr. Sungkyun Lim

Proposal Track

Student

Session Format

Paper Presentation

Abstract

In modern portable communication systems, size reduction of antennas is critical issue. This can be a difficult task at times due to performance of antennas being degraded as the antenna size is reduced. This brings the question, is it possible to maintain performance of antenna design while still reducing the size? The answer simply is yes. We can reduce an antenna size up to a half of the full sized antenna by simply implementing a top loading, a common method used in small antennas design.

Top loading implores a method of increasing the radiation resistance of the antenna. The resistance is increased because the top feature added to the antenna gives capacitance to the design. The structure of the design also cancels out any currents from the added portion. This prevents extra power from being consumed by the design. A typical top loading design can add to the performance of an antenna, making it seem to be physically bigger. In this aspect, by reducing the size of the elements in a log periodic dipole array and adding a top loading feature, a small and more compact design can be achieved.

A log periodic dipole array antenna (LPDA), is an antenna design that can operate at a wide bandwidth while still maintaining high performance. The design is simply as the name states, an array of dipoles that operate different frequencies. The spacing and size factors of the changing elements are important to the design. They are what allow the bandwidth to still be covered when going down the array, element by element. Another part of my design is that it is circularly polarized. This means that the antenna will be able to communicate in a circular 360 degrees of motion of its axes. This allows for better functionality and use because one will not be limited to a set plane of communication as much.

Creating a design that is physically smaller, and still maintains performance of a circularly polarized log periodic dipole array (CPLPDA) will be a new method that has not been developed as of this date. With my findings, I plan to submit a conference paper to IEEE International Symposium on Antennas and Propagation, and a journal paper to IEEE Transaction on Antennas and Propagation or IEEE Antenna and Wireless propagation Letters. My goal is to complete my research, develop simulations of the antenna designs, and fabricate and measure these designs. The design will be built to operate from 1 GHz to about 4.5 GHz. The goal will be to reduce the size of the antenna by 75% in area, this being a total reduction of each element to half its original length. The data collected will show that the method I used was a success and allow me to write the papers intended for publication.

Keywords

Antenna, Circularly polarized, Top loading, Log periodic dipole array

Award Consideration

1

Location

Room 2908

Presentation Year

2014

Start Date

11-15-2014 8:30 AM

End Date

11-15-2014 9:30 AM

Publication Type and Release Option

Presentation (Open Access)

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Nov 15th, 8:30 AM Nov 15th, 9:30 AM

Revolutionary Size Reduction of a Circularly Polarized, Log Periodic Dipole Array

Room 2908

In modern portable communication systems, size reduction of antennas is critical issue. This can be a difficult task at times due to performance of antennas being degraded as the antenna size is reduced. This brings the question, is it possible to maintain performance of antenna design while still reducing the size? The answer simply is yes. We can reduce an antenna size up to a half of the full sized antenna by simply implementing a top loading, a common method used in small antennas design.

Top loading implores a method of increasing the radiation resistance of the antenna. The resistance is increased because the top feature added to the antenna gives capacitance to the design. The structure of the design also cancels out any currents from the added portion. This prevents extra power from being consumed by the design. A typical top loading design can add to the performance of an antenna, making it seem to be physically bigger. In this aspect, by reducing the size of the elements in a log periodic dipole array and adding a top loading feature, a small and more compact design can be achieved.

A log periodic dipole array antenna (LPDA), is an antenna design that can operate at a wide bandwidth while still maintaining high performance. The design is simply as the name states, an array of dipoles that operate different frequencies. The spacing and size factors of the changing elements are important to the design. They are what allow the bandwidth to still be covered when going down the array, element by element. Another part of my design is that it is circularly polarized. This means that the antenna will be able to communicate in a circular 360 degrees of motion of its axes. This allows for better functionality and use because one will not be limited to a set plane of communication as much.

Creating a design that is physically smaller, and still maintains performance of a circularly polarized log periodic dipole array (CPLPDA) will be a new method that has not been developed as of this date. With my findings, I plan to submit a conference paper to IEEE International Symposium on Antennas and Propagation, and a journal paper to IEEE Transaction on Antennas and Propagation or IEEE Antenna and Wireless propagation Letters. My goal is to complete my research, develop simulations of the antenna designs, and fabricate and measure these designs. The design will be built to operate from 1 GHz to about 4.5 GHz. The goal will be to reduce the size of the antenna by 75% in area, this being a total reduction of each element to half its original length. The data collected will show that the method I used was a success and allow me to write the papers intended for publication.