Date of Award
12-1994
Document Type
Thesis
Degree Name
Master of Science
Department
Department of Electrical and Computer Engineering
First Advisor
Andrew Terzuoli, PhD
Abstract
This research involves the design, modeling, and testing of both tapered periodic surfaces (TPS) and transverse electromagnetic (TEM) horns. The goal is to reduce the off-boresight fields for a TEM horn and increase the peak-to-peak field levels on boresight. This is accomplished by applying a TPS to the free space end. Two tapers are designed - one that approximates an exponential impedance function and one that approximates a triangular impedance function. Both reduce the off-boresight fields of the TEM horn. In most cases the exponential taper reduces the field levels further than the triangular taper. This research shows that a TPS is an effective method of reducing diffraction. A procedure for designing a TPS to approximate a specific impedance function is presented. A two-dimensional finite difference time domain (FDTD) model predicts the tapers will reduce the diffraction. Experimental results verify the TPS's ability to reduce the peak off-boresight fields for a TEM horn antenna.
AFIT Designator
AFIT-GE-ENG-94D-33
DTIC Accession Number
ADA289708
Recommended Citation
Wolstenholme, Dennis J., "Reduction of Off-Boresight Fields for a TEM Horn Antenna" (1994). Theses and Dissertations. 6431.
https://scholar.afit.edu/etd/6431
Comments
The DTIC-supplied PDF of this thesis has illegible passages.
The author's Vita page is omitted.