Patent ID: 8638181
Filing Date: 2014-01-28
Classification: H01P,H05K,Y10T

Abstract:
1. A balun circuit comprising: a first pair of coupled lines; a first balanced port; a first unbalanced port; a first re-entrant box; and a first ferrite member; wherein: the first ferrite member is made of material which is ferrimagnetic and non-electrically-conductive; the first pair of coupled strip lines is electrically connected to the first balanced port and the first unbalanced port; the first re-entrant box includes an exterior surface and is made from electrically conductive material; the first re-entrant box field-encloses the first pair of coupled strip lines; the first re-entrant box is not electrically connected to the first pair of coupled lines; the first ferrite member includes an interior surface and defines an interior space; and the first pair of coupled strip lines and the first re-entrant box are located at least substantially within the interior space of the first ferrite member.