Multi-loop transformer having wideband frequency applications

摘要

A balun is disclosed that includes a main tank circuit, and at least one auxiliary tank circuit. The main tank circuit includes a primary winding and a secondary winding. The auxiliary tank circuit, which includes an auxiliary winding magnetically coupled to the primary and secondary windings and terminated in a capacitor, is electrically isolated from the main tank circuit and from an output port of the balun. The frequency responses of the main tank circuit and the auxiliary tank circuit may combine to result in a composite frequency response that is wider than the frequency response of the main tank circuit. The auxiliary tank circuit may be formed within an interior area of the primary and secondary windings of the main tank circuit.

主权项

1. A balun device, comprising:
an input port to receive an input signal; an output port to provide an output signal; a main tank circuit, including:
a primary winding coupled to the input port; anda secondary winding coupled to the output port; and an auxiliary tank circuit, electrically isolated from the main tank circuit and electrically isolated from the output port, including:
an auxiliary winding magnetically coupled to the primary winding and to the secondary winding; anda termination capacitor coupled in parallel with the auxiliary winding; wherein the primary winding and the secondary winding are interleaved with each other to form a loop; and the auxiliary tank circuit is formed within an interior area of the loop.