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

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

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)120-145
Number of pages12
JournalIEEE Antennas and Propagation Magazine
Volume57
Issue number3
DOIs
Publication statusPublished - 1 Jun 2015

Keywords

  • Dipole antennas
  • Ionosphere
  • Antenna measurements
  • Frequency measurement
  • Radio transmitters
  • Polarization

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