Avstämbar antenn och avstämningssystem för antenn

摘要

A tunable antenna of small-sized radio devices and a tuning method. The radiator (610) of an antenna of a radio device is of conductive coating of a dielectric substrate(605). Fuses (F61, F62, F63) connect to the radiating conductor so that the physical shape of the radiator and its electrical size at the same time depend on which fuses are conductive and which are not. The radiating conductor functions as a common current path to the fuses, and the fuse to be blown is selected on grounds of the magnitude or duration of a direct current. The fuses are surface mounted components. Also so called anti-fuses, which can be permanently changed from non-conductive to conductive, may be used. The tuning of an antenna mounted in the end product hardly changes the appearance of the antenna, and no vapours hazardous to health are formed in the tuning.