PROPERTIES OF AN ELECTROMAGNETICALLY COUPLED SMALL ANTENNA WITH A SUPERCONDUCTING THIN-FILM RADIATOR

This paper describes the structure and properties of a 900-MHz-band sm all antenna with a superconducting thin-film radiator operated by elec tromagnetic coupling. The radiation efficiency of the antenna with a l ambda/38 radiator reached 74% at 79 K, The loss in this antenna compri sed mismatching loss and radiator loss caused by the surface resistanc e of the superconducting thin film, A simulation model with a meander- line radiator and a parallel line is also proposed, This model makes i t possible to design a superconducting thin-film radiator which can be fabricated on a dielectric substrate by using the moment method witho ut taking account of the dielectric substrate.