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Development of an Ultra-Wideband Circularly Polarized Multiple Layer Dielectric Rod Antenna Design
Wainwright, Gregory David

2015, Doctor of Philosophy, Ohio State University, Electrical and Computer Engineering.
This dissertations focuses on the development of a novel Ultra-Wideband (UWB) circularly polarized dielectric rod antenna (CPDRA) which yields a constant gain, pattern, and phase center. These properties are important in many applications. Within radar systems a constant phase center is desirable to avoid errors within downrange and crossrange measurements. In a reflector antenna the illumination, spillover, and phase efficiencies will remain the same over an ultra-wideband. Lastly, near field probes require smooth amplitude and phase patterns over frequency to avoid errors during the calibration process of the antenna under test.

In this dissertation a novel CP feeding network has been developed for an ultra-wideband dielectric rod antenna. Circularly-polarized antennas have a major advantage over its linearly-polarized counterpart in that the polarization mismatch loss caused by misalignment between the polarizations of the incident fields and antenna can be avoided. This is important in satellite communications and broadcasts where signal propagation through the ionosphere can experience Faraday Rotation. A circularly polarized antenna is also helpful in mobile radar and communication systems where the receiving antenna’s orientation is not fixed. Previous research on UWB dielectric rod antenna designs has focused on Dual linear feeds. Each polarization within the dual linear feed is excited by a pair of linear launcher arms fed with a 00-1800 hybrid balun. The proposed CPDRA design does not require the 00-1800 hybrid baluns or 00-900 hybrid for achieving CP operation. These hybrids will increase the antenna’s size, weight, cost, and reduce operational bandwidth.

A design technique has been developed for an UWB multilayer dielectric waveguide used in a CPDRA antenna. This design technique uses near-field Electric field data from inside the waveguide, in conjunction with a genetic algorithm optimization to yield a wideband waveguide with a near field amplitude distribution that scales with frequency.

A multilayered dielectric waveguide presents many fabrication challenges. The thermal expansion rates, moisture absorption rates, and vibration properties differ within the various dielectric materials used. Therefore, the development of a wideband waveguide using one material with a low dielectric constant would be advantages since 3-D printing technology can be utilized. In this dissertation novel TE01 and TM01 mode suppressors have been developed using only a single dielectric material.
Chi-Chih Chen (Advisor)
Fernando Teixeira (Committee Member)
Patrick Roblin (Committee Member)
115 p.

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Wainwright, G. (2015). Development of an Ultra-Wideband Circularly Polarized Multiple Layer Dielectric Rod Antenna Design. (Electronic Thesis or Dissertation). Retrieved from https://etd.ohiolink.edu/

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Wainwright, Gregory. "Development of an Ultra-Wideband Circularly Polarized Multiple Layer Dielectric Rod Antenna Design." Electronic Thesis or Dissertation. Ohio State University, 2015. OhioLINK Electronic Theses and Dissertations Center. 23 Sep 2017.

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Wainwright, Gregory "Development of an Ultra-Wideband Circularly Polarized Multiple Layer Dielectric Rod Antenna Design." Electronic Thesis or Dissertation. Ohio State University, 2015. https://etd.ohiolink.edu/

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