Accession Number:

ADA622309

Title:

Computational Electromagnetic Studies for Low-Frequency Compensation of the Reflector Impulse-radiating Antenna

Descriptive Note:

Master's thesis

Corporate Author:

AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT

Personal Author(s):

Report Date:

2015-03-26

Pagination or Media Count:

136.0

Abstract:

The reflector impulse-radiating antenna IRA is considered to meet the requirement for a wideband, directional antenna with short temporal response and small electrical footprint. Standard reflector IRA designs are modeled and performance is simulated using full-wave computational electromagnetic CEM software. Characterization of the standard designs reveals the possible existence of wide, frequency-independent backlobes containing nearly 40 of the radiated power at high frequencies. These undesirable backlobes have never been hypothesized, predicted or measured, likely due in part to their alignment outside the primary measurement planes. At the lowest operating frequencies, the reflector IRA is unaffected by backlobes, but is characterized by low radiation efficiency and high resistive losses. Simulated studies are conducted to identify options for enhancing the low-frequency performance of the reflector IRA, including novel multi-arm feed structures and varied resistor distributions and values in the matching circuit component of the antenna design. Both techniques are predicted to provide viable options for enhancing and tuning the performance of the reflector IRA at low frequencies.

Subject Categories:

  • Electrical and Electronic Equipment
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE