| US 7,573,349 B2 | ||
| Antenna balun | ||
| Charles T. Rauch, Barnesville, Ga. (US) | ||
| Assigned to PDS Electronics, Inc., Akron, Ohio (US) | ||
| Filed on Sep. 19, 2006, as Appl. No. 11/523,141. | ||
| Claims priority of provisional application 60/718008, filed on Sep. 19, 2005. | ||
| Prior Publication US 2007/0063787 A1, Mar. 22, 2007 | ||
| Int. Cl. H03H 7/42 (2006.01); H03H 7/38 (2006.01) | ||
| U.S. Cl. 333—26 [333/32] | 5 Claims |
| 1. 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.
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