| 摘要 |
An isolating transmission line transformer (ITLT) or a data communication system or a method of constructing such a transformer, comprises: a first port 37, 39 and a second port each connected to a respective winding provided by a transmission line formed by first and second conductors which are arranged with a constant gap g between the said conductors and where the transmission line is wound around a core 41 to have a substantially constant gap G between adjacent turns. The terminals of the said ports may be spaced by a gap equal to that between the conductors. The ITLT may provide a one to one impedance transformation ratio wherein the transmission line has an impedance which is substantially one-half of that present at the first and second ports. The capacitance between windings may be minimised and the size of the core 41 may be selected to increase the operational bandwidth of the transformer. The said ports may exhibit constant operational characteristics over a frequency range of ten Mega-Hertz to one Giga-Hertz. The ports of the ITLT may be connected to a computer, a modem or any data equipment and/or a transmission line. |
