Patent ID: 7573349

Claim:
A balun for coupling an antenna having a ground connection to a coaxial feedline having a ground connection, the balun comprising only two transmission line transformers, a said first transmission line transformer having a core , said first transmission line transformer having a pair of inputs and a pair of associated outputs; a said second transmission line transformer having a core, said second transmission line transformer having a pair of inputs and a pair of associated outputs, said core of said second transmission line transformer being larger than said core of said first transmission line transformer; wherein said first and second transmission line transformers are coupled in parallel at their inputs to the feedline, and coupled in series at their outputs to the antenna, such that one said input of said second transmission line transformer is coupled to the ground of the coaxial feedline, and said output which is associated with said one of said input is coupled to the ground connection of the antenna, such that said core of said second transmission line transformer dissipates more power than said core of said first transmission line transformer.