Double-Mode Surface-Acoustic-Wave (DMS) Filter Having A Transition Region with A Partly Uniform Geometric Property

A method of manufacturing a double-mode surface-acoustic-wave filter, the method comprising:

• providing a first set of fingers of at least one interdigital transducer of the double-mode surface-acoustic-wave filter, the first set of fingers having a geometric property;
• and
• providing a second set of fingers of the at least one interdigital transducer of the double-mode surface-acoustic-wave filter, the second set of fingers positioned adjacent to the first set of fingers and associated with an outer edge of the at least one interdigital transducer, the geometric property across a subset of the second set of fingers being substantially uniform, a value of the geometric property across the subset of the second set of fingers being different than a value of the geometric property across the first set of fingers.

An apparatus comprising:

• a double-mode surface-acoustic-wave filter comprising at least two adjacent interdigital transducers, the at least two adjacent interdigital transducers comprising multiple fingers, a portion of the multiple fingers being positioned within a transition region of the double-mode surface-acoustic-wave filter,
• wherein a profile of a geometric property across the portion of the multiple fingers has a trapezoidal shape.