Analysis of HF antennas on a helicopter in the presence of a stratified ground

Dong Ho Han, Anastasis C. Polycarpou, Constantine Balanis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Analysis of antennas on a helicopter airframe including the surrounding environment, such as the ground, will provide much more reliable radiation characteristics for communication link budget predictions. In order to account for all reflections and diffractions from the airframe, as well as those from a stratified ground, a full-wave analysis should be used. Since the exact Green's function for a stratified ground is available, the radiation problem of a helicopter above the ground reduces to a problem of finding the total equivalent source in the presence of the ground. In this paper, HF antennas, such as a 14-ft towel-bar and a 24-ft inverted-L on the AH-64 (Apache) full-scale helicopter, are analyzed in the presence of a stratified ground. In particular, the ground influence on the radiation pattern is investigated using the finite element method (FEM) in conjunction with Norton's approximation. Therefore, the radiated field contains not only the space wave but also the surface wave which is important for a short observation distance. The lossy ground is defined by its relative permittivity and electric conductivity.

Original languageEnglish (US)
Title of host publicationIEEE Antennas and Propagation Society International Symposium
Subtitle of host publicationWireless Technologies and Information Networks, APS 1999 - Held in conjunction with USNC/URSI National Radio Science Meeting
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages496-499
Number of pages4
Volume1
ISBN (Electronic)078035639X, 9780780356399
DOIs
StatePublished - Jan 1 1999
Event1999 IEEE Antennas and Propagation Society International Symposium, APSURSI 1999 - Orlando, United States
Duration: Jul 11 1999Jul 16 1999

Other

Other1999 IEEE Antennas and Propagation Society International Symposium, APSURSI 1999
CountryUnited States
CityOrlando
Period7/11/997/16/99

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Radiation

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