Measurements of the transmitting and the receiving patterns of a dipole antenna for an electron plasma wave

The transmitting and the receiving patterns of a dipole antenna for an electron plasma wave have been measured by using the interference method. The results agree fairly well with the theoretical patterns that were predicted from the fluid model analysis and also experimentally prove the reciprocity relationship between the transmitting and the receiving patterns, which is theoretically found to be valid in the plasma wave approximation. The characteristics of the transmitting and the receiving efficiencies versus the dc bias voltage applied to the dipole antenna have been also experimentally investigated.