Patent ID: 6653910
Filing Date: 2003-11-25
Classification: H01P,H03H

Abstract:
A spiral balun, comprising:a substrate; a first transmission line on said substrate having a first end suitably adapted to receive a first input and a second end suitably adapted to provide a first output; a second transmission line on said substrate having a third end suitably adapted to receive a second input signal and a fourth end suitably adapted to provide a second output signal; and a third transmission line on said substrate having a fifth end suitably adapted to receive a third input signal and a sixth end suitably adapted to provide a third output signal; said first transmission line comprising a first section proximate said first end and forming a first spiral in a first direction; said first transmission line further comprising a second section proximate said second end and forming a second spiral in a second direction; said first section of said first transmission line and said second section of said first transmission line connected via a substantially unitary unwound segment of said first transmission line; said first section of said first transmission line having at least one of a point, a line and a plane of symmetry with respect to said second section of said first transmission line; said second transmission line forming a third spiral substantially interleaved with said first section of said first transmission line in a third direction; and said third transmission line forming a fourth spiral substantially interleaved with said second section of said first transmission line in a fourth direction.