Reducing coupling coefficient variation using intended width mismatch

A wireless device comprising:

• signal processing circuitry configured to process a signal;
• and
• a coupler in electrical communication with the signal processing circuitry, the coupler including a first conductive trace and a second conductive trace, the first conductive trace including a first segment of a first width, a second segment of a second width, and a third segment of the first width, the second segment located between the first segment and the third segment, the second width differing from the first width, the second conductive trace positioned below the first conductive trace, the second conductive trace including a first segment of the first width, a second segment of the second width, and a third segment of the first width, the second segment located between the first segment and the third segment, the first width and the second width selected to reduce a coupling factor variation for a coupling factor at a particular operating frequency for the coupler, the second conductive trace partially offset from the first conductive trace.

A coupler comprising:

• a first conductive trace, the first conductive trace including a first segment of a first width, a second segment of a second width, and a third segment of the first width, the second segment located between the first segment and the third segment, the second width differing from the first width, and a length of the first segment of the first conductive trace, a length of the second segment of the first conductive trace, and a length of the third segment of the first conductive trace differing;
• and
• a second conductive trace positioned below the first conductive trace, the second conductive trace including a first segment of the first width, a second segment of the second width, and a third segment of the first width, the second segment located between the first segment and the third segment, the first width and the second width selected to reduce a coupling factor variation for a coupling factor at a particular operating frequency for the coupler.

A wireless device comprising:

• signal processing circuitry configured to process a signal;
• and
• a coupler in electrical communication with the signal processing circuitry, the coupler including a first conductive trace and a second conductive trace, the first conductive trace including a first segment of a first width, a second segment of a second width, and a third segment of the first width, the second segment located between the first segment and the third segment, the second width differing from the first width, the second conductive trace positioned below the first conductive trace, the second conductive trace including a first segment of the first width, a second segment of the second width, and a third segment of the first width, the second segment located between the first segment and the third segment, the first width and the second width selected to reduce a coupling factor variation for a coupling factor at a particular operating frequency for the coupler, at least one of the first segment of the first conductive trace, the second segment of the first conductive trace, and the third segment of the first conductive trace is of a different length than at least one other segment of the first conductive trace.

A method of manufacturing a coupler, the method comprising:

• forming a first conductive trace, the first conductive trace including a first segment of a first width, a second segment of a second width, and a third segment of the first width, the second segment located between the first segment and the third segment, the second width differing from the first width;
• and
• forming a second conductive trace below the first conductive trace, the second conductive trace including a first segment of the first width, a second segment of the second width, and a third segment of the first width, the second segment located between the first segment and the third segment, the first width and the second width selected to reduce a coupling factor variation for a coupling factor at a particular operating frequency for the coupler, the forming the second conductive trace below the first conductive trace further including partially offsetting the second conductive trace from the first conductive trace.