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Development of Automatic Design Optimization Method for Ultrawide Bandwidth (UWB) Multi-Layer Dielectric Rod Antenna

Liu, Chia-Wei

Abstract Details

2011, Master of Science, Ohio State University, Electrical and Computer Engineering.

Dielectric rod antenna has been shown to provide wideband, dual-polarization, and symmetric pattern. A two layer dielectric rod antenna (DRA) was shown to achieve more than 4:1 bandwidth of stable gain and with more than 55 degree HPBW. Although, it was predicted that a multi-layer DRA design should be able to achieve more than 8:1 bandwidth, such design has never been realized due to its design and fabrication complexity. This thesis discusses about how we overcome these challenges via the utilization of genetic-algorithm (GA) for design optimization procedure.

The key challenge in designing a multi-layer DRA is to choose proper thickness and dielectric constant of each layer to meet desired VSWR, pattern, and phase center requirements. This becomes even more difficult when the when the number of layers increases for achieving a greater bandwidth.

Although most of the new commercial EM simulation codes such as FEKO and HFSS have built-in parameter optimization functions, this approach consumes too much computer resources and is not easy to implement complex design goal that involves many parameters and different frequencies. This thesis will demonstrate an alternative antenna design optimization method that employs an external GA program which interacts with commercial EM simulation software such as HFSS, to automatically choose optimized thicknesses and dielectric constants of multi-layer DRA that achieves constant gain, beamwidth, phase center and wideband performance objectives.

CHI-CHIH CHEN (Advisor)
JOHN VOLAKIS (Committee Member)

Recommended Citations

Citations

  • Liu, C.-W. (2011). Development of Automatic Design Optimization Method for Ultrawide Bandwidth (UWB) Multi-Layer Dielectric Rod Antenna [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306512723

    APA Style (7th edition)

  • Liu, Chia-Wei. Development of Automatic Design Optimization Method for Ultrawide Bandwidth (UWB) Multi-Layer Dielectric Rod Antenna. 2011. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1306512723.

    MLA Style (8th edition)

  • Liu, Chia-Wei. "Development of Automatic Design Optimization Method for Ultrawide Bandwidth (UWB) Multi-Layer Dielectric Rod Antenna." Master's thesis, Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306512723

    Chicago Manual of Style (17th edition)