Measuring the Isolation of the Circularly Polarized Characteristic Waves in NVIS Propagation [Measurements Corner]

Author

Witvliet, Ben A. ; van Maanen, Erik ; Petersen, George J. ; Westenberg, Albert J. ; Bentum, Mark J. ; Slump, Cornelis H. ; Schiphorst, Roel

Author_Institution

Spectrum Manage. Dept., Radiocommun. Agency Netherlands, Groningen, Netherlands

Volume

57

Issue

3

fYear

2015

fDate

6/1/2015 12:00:00 AM

Firstpage

120

Lastpage

145

Abstract

Separate excitation of the characteristic waves in the ionosphere results in two orthogonal propagation channels on the same frequency, which may be used in diversity and multiple-input, multiple-output (MIMO) systems. In this article, a method to measure the isolation between these paths is proposed and demonstrated in a near vertical incidence skywave (NVIS) experiment at a frequency of 7 MHz over a 105-km distance. Characteristic wave isolation exceeding 25 dB is measured during "Happy Hour": the interval when the propagation path just opens or closes and only the extraordinary wave propagates.

Keywords

MIMO communication; diversity reception; electromagnetic wave polarisation; ionospheric electromagnetic wave propagation; radiowave propagation; wireless channels; MIMO diversity system; NVIS propagation; circularly polarized characteristic wave isolation measurement; ionosphere characteristic wave; multiple input multiple output system; near vertical incidence skywave experiment; orthogonal propagation channel; Antenna measurements; Dipole antennas; Frequency measurement; Ionosphere; Polarization; Radio transmitters;

fLanguage

English

Journal_Title

Antennas and Propagation Magazine, IEEE

Publisher

ieee

ISSN

1045-9243

Type

jour

DOI

10.1109/MAP.2015.2445633

Filename

7214390