Accession Number:

ADA614347

Title:

An Algorithm to Calculate Phase-Center Offset of Aperture Antennas when Measuring 2-Dimensional Radiation Patterns

Descriptive Note:

Final rept. May-Aug 2014

Corporate Author:

ARMY RESEARCH LAB WHITE SANDS MISSILE RANGE NM SURVIVABILITY/LETHALITY ANALYSIS DIRECTORATE

Report Date:

2015-01-01

Pagination or Media Count:

20.0

Abstract:

Centering the phase center of an antenna onto the rotational axis used to measure its radiation pattern is an iterative and time- consuming process. To facilitate this, a MATLAB algorithm has been developed to calculate the phase-center offset from the axis of rotation of a 2-dimensional antenna pattern. The hybrid algorithm comprises a combination of the 2-point method to calculate the offset along the antenna s main beam and an antisymmetry method is used to calculate offset perpendicular to the main-beam direction. The MATLAB algorithm is tested on the E-plane radiation pattern of a cylindrical horn antenna calculated using the high-frequency structural simulator s electromagnetic simulation engine, radiating at 5 GHz. The algorithm calculates the phase-center offset to within 15. Because the algorithm analyzes the unwrapped phase of the radiation pattern, which it converts to offset distance, no ambiguity due to offsets greater than a wavelength exists. Using this algorithm, the phase center of the antenna can be placed coincident to the axis of rotation after the first antenna pattern is measured and analyzed.

Subject Categories:

  • Numerical Mathematics
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE