Marchand balun
AssigneeSumitomo Electric Industries, Ltd.
InventorsOsamu Anegawa, Tsuneo Tokumitsu
Life of this patent
Estimating the term…
Abstract
A marchand balun with a reduced plane size is disclosed. The marchand balun provides two coupling units each having two transmission lines coupled to each other and having a length of λ/8, where λ is a characteristic wavelength of a signal subject to the marchand balun. The marchand balun further provides an additional unit, where two coupling unit and the additional unit are connected in series to each other. The additional unit is one of a transmission line with a length of λ/16 with one open end and a capacitor with one grounded end.
Claims11
A marchand balun that provides an un-balanced terminal and two balanced terminals, the marchand balun converting a signal with a specific wavelength of A between a un-balanced mode at the un-balanced terminal and a balanced mode at the balanced terminals, the marchand balun comprising:
- a first coupling unit that includes a first transmission line and a second transmission line coupled with the first transmission line, the first transmission line having an end and another end, the end being connected to the un-balanced terminal, the second transmission line having a grounded end and another end connected to one of the balanced terminals;
- a second coupling unit that includes a third transmission line and a fourth transmission line coupled with the third transmission line, the third transmission line having an end and another end, the end of the third transmission line being connected to the another end of the first transmission line, the fourth transmission line having a grounded end and another end connected to another of the balanced terminals;
- and
- an additional unit having an end connected to the another end of the third transmission line,
- wherein the first to fourth transmission lines in the first unit and the second unit have a length longer than λ/16 but shorter than 3λ/16.
Dependencies are inferred from the claim text.