Modelling and measurement of high frequency antennas for the U.S. Coast Guard HH-60J helicopter

Author

Roma Rao, B. ; Jones, D.N. ; Davis, R.J. ; Vessey, R. ; Engbring, T. ; Moseley, Z.V.

Author_Institution

The MITRE Corp., Bedford, MA, USA

fYear

1993

fDate

June 28 1993-July 2 1993

Firstpage

1824

Abstract

The authors describe the analysis that was conducted using the NEC3-method of moments code to predict the input impedance and far-field patterns of two types of HF antennas for the US Coast Guard HH-60J helicopter. The operating frequencies for these antennas are 3.123, 5.696 (primary frequency), 8.984 (secondary frequency), 11.201, and 15.084 MHz. The calculated results have been validated by comparison with measurements on the real helicopter as well as on a 1:7.5 scaled down model of the helicopter. The impact of tuning reactance on the radiation efficiency of the antennas, as well as the relative performance of the two antennas for high angle sky wave and ground wave communications over mixed land and sea paths, has been investigated.<>

Keywords

aircraft communication; antenna radiation patterns; electric impedance; helicopters; loop antennas; method of moments; mobile antennas; monopole antennas; tuning; 11.201 MHz; 15.084 MHz; 3.123 MHz; 5.696 MHz; 8.984 MHz; HF antennas; NEC3-method of moments code; US Coast Guard HH-60J helicopter; communications; far-field patterns; input impedance; measurements; mixed land and sea paths; model; radiation efficiency; shorted loop antenna; tuned monopole antenna; tuning reactance; Antenna measurements; Cable insulation; Coils; Frequency measurement; Helicopters; Impedance measurement; Relays; Sea measurements; Tuning; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium, 1993. AP-S. Digest

Conference_Location

Ann Arbor, MI, USA

Print_ISBN

0-7803-1246-5

Type

conf

DOI

10.1109/APS.1993.385558

Filename

385558