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1. Petten, Steven. Theoretical and Experimental Study to Improve Antenna Performance Using a Resonant Choke Structure.

Degree: 2014, University of Waterloo

Every antenna requires a feed network to supply its RF energy. In the case of a simple dipole antenna, this could be a coaxial cable with a tuning element and matching balun. For mostly omnidirectional antennas, currents can easily couple to metallic surfaces inside an antenna's near field that includes the outer conductor of the coaxial feed line. These outer conductor currents can radiate into the far field to skew overall antenna radiation patterns. Other parameters such as VSWR may also be significantly affected. Electromagnetic field absorbers placed on the coaxial waveguide pose other problems where multiple RF carriers exist and non-linear dielectric materials can cause issues. Coil structures can also lead to radiation problems. This leads towards a metallic resonating choke solution, which will allow the antenna to radiate without affecting performance. The primary goal of this research is to integrate a metallic resonant choke structure that will prevent currents from travelling down the feed line outer conductor. In this work, an in-depth analysis is performed on each antenna component. This includes the feed network elements (waveguide coaxial line, tuning element, matching balun) and the radiator (dipole arms, resonant choke, outer feed). Each element is analyzed and designed to allow the manufactured antenna to have similar performance to its ideal center-fed counterpart for a tuned frequency band. To predict the performance of the manufactured antenna, several simulation models are constructed. To model the radiator and resonant choke structure, a Method of Moments code is written with Matlab. These results are compared with HFSS and measurements with good correlation. Specifically, the axisymmetric MoM code uses a KVL approach to integrate the internal choke structure that works well to reduce simulation time to a fraction of that taken by FEM solvers. To design the feed components, a combination of circuit models and HFSS allows for quick design with accurate results when compared with measured values. This systems design approach has the flexibility to add complexity to improve accuracy where needed.

Subjects/Keywords: Antenna; Dipole; Choke; Resonant Choke; Feed; Current Choke; Method of Moments; HFSS; ADS; Antenna Choke; Numerical Model; Matlab; Code; Integral Equation; VSWR; Gain; Directivity; Lumped Element; Coupling; Prototype; Design for Manufacturing; Measurement; Balun Choke; Balun; Quarter-wave; Half-wave

Resonant Choke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 A.1.4 Coaxial Step… …4.3 Resonant Choke Manufactured Prototype Structure . . . . . . . . . . . . . 50 4.4… …research will focus on a resonant choke design for single or stacked dipole antenna… …enclosed resonant choke solution is pursued. 1.3 Research Objectives Most texts simply model… …complete lower half of the resonant choke antenna geometry is provided in figure 1.3. The feed… 

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APA (6th Edition):

Petten, S. (2014). Theoretical and Experimental Study to Improve Antenna Performance Using a Resonant Choke Structure. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/8978

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Petten, Steven. “Theoretical and Experimental Study to Improve Antenna Performance Using a Resonant Choke Structure.” 2014. Thesis, University of Waterloo. Accessed November 21, 2019. http://hdl.handle.net/10012/8978.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Petten, Steven. “Theoretical and Experimental Study to Improve Antenna Performance Using a Resonant Choke Structure.” 2014. Web. 21 Nov 2019.

Vancouver:

Petten S. Theoretical and Experimental Study to Improve Antenna Performance Using a Resonant Choke Structure. [Internet] [Thesis]. University of Waterloo; 2014. [cited 2019 Nov 21]. Available from: http://hdl.handle.net/10012/8978.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Petten S. Theoretical and Experimental Study to Improve Antenna Performance Using a Resonant Choke Structure. [Thesis]. University of Waterloo; 2014. Available from: http://hdl.handle.net/10012/8978

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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