Metal barrel, for beverages, incorporates an antenna to broadcast signal transmissions over long distances to show the barrel identity and location

摘要

The metal barrel (11), for beverages, is fitted with a radio antenna (13) as a coaxial cable, at the outer mantle surface of the barrel, in resonance for the working frequency through its geometry. The antenna is in two components with a narrow passage opening with a length according to the wavelength, and the transmitter within the barrel and directly behind the passage, as a conductor loop with the same dimensions as the passage opening.