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US 7,116,185 B2Granted
Balun
AssigneeTDK Corporation
InventorsShoichi Ohi, Hideya Matsubara, Naoto Ohyama
Life of this patent
Estimating the term…
Abstract
A balun comprises an unbalanced terminal, two balanced terminals, and two ground terminals. The balun further comprises: a low-pass filter provided between the unbalanced terminal and one of the balanced terminals; and a high-pass filter provided between the unbalanced terminal and the other of the balanced terminals. The low-pass filter incorporates two coils and a capacitor. The high-pass filter incorporates two capacitors and a coil. The coils and the capacitors are made up of conductor layers of a multi-layer substrate.
Claims13
A balun comprising:
- an unbalanced terminal for receiving and outputting unbalanced signals;
- a first balanced terminal and a second balanced terminal for receiving and outputting balanced signals;
- a low-pass filter provided between the unbalanced terminal and the first balanced terminal;
- a high-pass filter provided between the unbalanced terminal and the second balanced terminal;
- and
- a layered structure including dielectric layers and conductor layers alternately stacked, wherein:
- the low-pass filter and the high-pass filter include a total of at least three coils and a total of at least three capacitors;
- the at least three coils are disposed opposite to the at least three capacitors, with one of the dielectric layers in the layered structure disposed between the coils and the capacitors;
- the at least three coils are disposed in locations that do not overlap one another when seen in a direction orthogonal to the layers of the layered structure;
- each of the at least three coils includes a plurality of coil-forming conductor layers that are disposed on different ones of the dielectric layers of the layered structure and connected via at least one through hole;
- and
- the at least three capacitors are formed using a plurality of capacitor-forming conductor layers disposed on at least three of the dielectric layers of the layered structure, and at least one of the plurality of capacitor-forming conductor layers is disposed in a location sandwiched by other two of the plurality of capacitor-forming conductor layers located above and below, and is shared among a plurality of capacitors.
9 more elements
A balun comprising:
- an unbalanced terminal for receiving and outputting unbalanced signals;
- a first balanced terminal and a second balanced terminal for receiving and outputting balanced signals;
- a low-pass filter provided between the unbalanced terminal and the first balanced terminal;
- a high-pass filter provided between the unbalanced terminal and the second balanced terminal;
- and
- a layered structure including dielectric layers and conductor layers alternately stacked, wherein:
- the low-pass filter and the high-pass filter include a total of at least three coils made up of the conductor layers;
- the at least three coils are provided in locations that do not overlap one another when seen in a direction orthogonal to the layers of the layered structure;
- each of the at least three coils includes a plurality of coil-forming conductor layers that are disposed on different ones of the dielectric layers of the layered structure and connected via at least one through hole;
- the balun further comprises a separating section made up of the conductor layers and electromagnetically separating the at least three coils from one another;
- and
- the separating section includes:
- a plurality of coil-separating conductor layers that are respectively disposed on the ones of the dielectric layers on which the respective coil-forming conductor layers are disposed;
- and a plurality of through holes for connecting the plurality of coil-separating conductor layers.
11 more elements
Dependencies are inferred from the claim text.