A special feature of plasma column: Nested plasma antenna

The plasma antenna has been found as a very innovative and interesting area for researchers from several years. Various properties of plasma added curiosity in invention towards its relevance for antennas. This paper presents an experiment conducted to test the possibility of existence of nested plasma antenna. Both the antennas are made of the lead glass tubes filled with neon gas at approximate pressure of 1.5 Torr. Conventional high voltage excitation technique is used to ionize the gas while capacitive coupling is utilized for excitation. The return loss and the radiation pattern for these two antennas are discussed in this paper. Radiation pattern of inner monopole plasma antenna was uninterrupted even after ignition of external helical plasma antenna. From the radiation pattern obtained it is observed that the electromagnetic radiations of inner high frequency antenna can penetrate through outer low frequency antenna.