Transformer filter arrangement
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsStefan Andersson, Fenghao Mu, Johan Wernehag
Life of this patent
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Abstract
A transformer filter arrangement including a transformer having a first winding and a second winding is provided. Both of the first and the second windings are located between an outer border and an inner border, which is inside the outer border. The transformer filter arrangement further includes at least one reactive sub circuit, each including at least one inductor. The first winding of the transformer is divided into a plurality of winding segments. At least a first one of the at least one reactive sub circuit being connected in series with the winding segments of the first winding between two such winding segments, and having at least one of the at least one inductor located inside said inner border.
Claims20
A transformer filter arrangement, comprising:
- a transformer having a first winding and a second winding formed by conducting and isolation layers of one of a chip and printed circuit board, winding loops of both the first and the second windings, when considered in a plane of the first winding and the second winding of the transformer, enclose an area of the one of said chip and printed circuit board;
- and
- at least one reactive sub circuit, each comprising:
- at least one inductor formed by a loop in the corresponding plane of one of the first winding and the second winding, and
- a capacitor connected one of in series and in parallel with the at least one inductor;
- the first winding of the transformer being divided into a plurality of winding segments;
- at least a first one of the at least one reactive sub circuit:
- being connected in series with the plurality of winding segments of the first winding between two such winding segments, and
- having at least one of the at least one inductor located in said area;
- and
- the transformer and the at least one reactive sub circuit being tuned such that the transformer filter arrangement is configured to pass signals at a fundamental frequency and to suppress signals at least at one interfering frequency.
A radio communication apparatus comprising at least one transformer filter arrangement, each transformer filter arrangement including:
- a transformer having a first winding and a second winding formed by conducting and isolation layers of one of a chip and printed circuit board, winding loops of both the first and the second windings, when considered in a plane of the first winding and the second winding of the transformer, enclose an area of the one of said chip and printed circuit board;
- and
- at least one reactive sub circuit, each comprising:
- at least one inductor formed by a loop in the corresponding plane of one of the first winding and the second winding, and
- a capacitor connected one of in series and in parallel with the at least one inductor;
- the first winding of the transformer being divided into a plurality of winding segments;
- at least a first one of the at least one reactive sub circuit:
- being connected in series with the plurality of winding segments of the first winding between two such winding segments, and
- having at least one of the at least one inductor located in said area;
- and
- the transformer and the at least one reactive sub circuit being tuned such that the transformer filter arrangement is configured to pass signals at a fundamental frequency and to suppress signals at least at one interfering frequency.
Dependencies are inferred from the claim text.