Patent ID: 9692387
Date: 2017-06-27
CPC Classifications: H01P,H03F,H03H

Claim:
1. A balun for transforming signals between an unbalanced impedance and a balanced impedance, comprising: a stack of at least an electrically conductive plate, and a dielectric layer having a first side and a second side opposite to the first side; a first electrically conductive line comprising a first end and a second end, arranged on the dielectric layer at the first side of the dielectric layer; a second electrically conductive line comprising a third end and a fourth end, arranged on the dielectric layer at the second side of the dielectric layer such that the first electrically conductive line substantially overlaps the second electrically conductive line; and a micro strip line comprising a fifth end electrically coupled to the third end and a sixth end electrically coupled to the electrically conductive plate; wherein the electrically conductive plate is arranged on the dielectric layer at the second side, the first end is electrically coupled to the balanced impedance, the second end is electrically coupled to the electrically conductive plate, the third end is electrically coupled to the balanced impedance, the fourth end to the unbalanced terminal, and the electrically conductive plate is hollowed in at least a region corresponding to a portion of an overlap area of the first electrically conductive line and second electrically conductive line.