Integrated power combiner/splitter
A combiner/splitter with distributed lines including a first line formed of a first planar winding in a first conductive level and of a second planar winding in a second conductive level; a second line formed of a third planar winding interdigited with the first winding in the first level, and of a fourth planar winding interdigited with the second winding in the second level; a first capacitive element connecting the external ends of the first and third windings; and a second capacitive element connecting the external ends of the second and fourth windings.
1. A combiner/splitter with distributed lines comprising:
a first line formed of a first planar winding in a first conductive level and of a second planar winding in a second conductive level;
a second line formed of a third planar winding interdigited with the first winding in the first level, and of a fourth planar winding interdigited with the second winding in the second level;
a first discrete capacitive element connecting the external ends of the first and third windings; and
a second discrete capacitive element connecting the external ends of the second and fourth windings.
2. The combiner/splitter of claim 1 , wherein the windings forming a same line wind in inverse directions.
3. The combiner/splitter of claim 1 , wherein:
the first and third windings have a length difference of one quarter of a turn; and
the second and fourth windings have a length difference of one quarter of a turn.
4. The combiner/splitter of claim 1 , wherein the capacitive elements have values selected from a range from 0.1 to 10 picofarads.
5. A method for manufacturing a combiner/splitter with two coupled lines, comprising
forming a first line of a first planar winding in a first conductive level and of a second planar winding in a second conductive level;
forming a second line of a third planar winding interdigitated with the first winding in the first level and of a fourth planar winding interdigited with the second winding in the second level;
connecting a first capacitive element to connect external ends of the first and third windings; and
connecting a second capacitive element to connect external ends of the second and fourth windings.
6. The method of claim 5 , wherein central ends of the windings of a same line are connected by a conductive via.
7. An electrical power combiner/splitter with distributed lines, comprising:
a first line including a first planar winding in a first conductive level and a second planar winding in a second conductive level;
a second line including a third planar winding interdigitated with the first planar winding in the first conductive level and a fourth planar winding interdigitated with the second planar winding in the second conductive level;
a first capacitive element connecting external ends of the first and third planar windings; and
a second capacitive element connecting external ends of the second and fourth planar windings.
8. The power combiner/splitter of claim 7 , wherein the first and second planar windings wind in opposite directions and wherein the third and fourth planar windings wind in opposite directions.
9. The power combiner/splitter of claim 7 , wherein the first and third planar windings have a length difference of one quarter turn and wherein the second and fourth planar windings have a length difference of one quarter turn.
10. The power combiner/splitter of claim 9 , wherein central ends of the first and second planar windings are connected by a first conductive via and wherein central ends of the third and fourth planar windings are connected by a second conductive via.