ABSTRACT
A transformer is a device that converts one level of voltage to another level at the same radio frequency (RF). It consists of one or more coil(s) of wire wrapped around a common magnetic core. These coils are usually not connected together electrically. The transformer has at least two windings, one of them (primary) is connected to a source of RF power and the other (secondary) is connected to the RF loads. The analysis of the transformer can be facilitated by referring the transformer to either the primary side or the secondary side. Transmission line transformers (TLT) are constructed by winding pairs of parallel conducting wires separated by a uniform distance on the magnetic core. They have better frequency characteristics than conventional transformers for specifically higher-frequency applications. TLTs can also be constructed using series connection with filar configuration. This is a practical implementation technique that is straightforward and expedites the design process.
