Near field and damping effects on the radiation of ion acoustic waves from antennas


  • Y. Nakamura,

  • Y. Nomura,

  • K. E. Lonngren


Radiation patterns of a longitudinal wave transmitted in a warm plasma from monopole antennas are numerically calculated taking wave damping and near field effects into consideration. Both a wire and a circular grid are examined. The patterns are measured experimentally for ion acoustic waves. Experimental results agree with the theoretical prediction. Both effects broaden the radiation patterns.