Accession Number:

ADA207356

Title:

An Experimental and Computer Modeling Study of Stepped Radius Monopole Antennas

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

1988-12-01

Pagination or Media Count:

163.0

Abstract:

This thesis compares the input impedance numerically calculated by MININEC, NEC, and NECGS with experimental results on stepped radius monopole antennas for swept frequencies. This determines the limitation of computer codes and gives guidelines for Yagi and Log Periodic LP antenna designs which use Tapered Linear Antenna Elements TLAEs NEC and MININEC, thin wire modeling codes, use different Electric Field Integral Equation EFIE formulations of the method of moments for the solution of currents. A cylindrical wire cage model is used via NECGS. Four groups of computer models are developed, varying the number of segments from 1 to 70 for 27-31 MHz. Reflection coefficients of seven experimental models are measured at the antenna feed point, and the input impedances are calculated by an auxiliary computer program. The input impedance is then analyzed by comparing the computer simulation results with measured results. Surprisingly, the input impedance of MININEC is closest to experimental results for monopoles which were constructed with ratios of radius-to-wavelength up to 0.0026.

Subject Categories:

  • Electrical and Electronic Equipment
  • Computer Programming and Software

Distribution Statement:

APPROVED FOR PUBLIC RELEASE