Unapodization

A method, comprising:

• providing an unapodized interdigital transducer disposed on a substrate, the unapodized interdigital transducer including
• a pair of first electrodes oppositely positioned on the substrate, wherein an aperture is formed between the pair of first electrodes;
• a plurality of variable length second electrodes arranged using a predetermined pattern defined by each second electrode in the plurality of second electrodes being coupled to one of the first electrodes in the pair of first electrodes and being configured to extend into the aperture, wherein at least one second electrode in the plurality of second electrodes coupled to one of the first electrodes in the pair of first electrodes has the same length as at least another second electrode in the plurality of second electrodes coupled to another first electrode in the pair of first electrodes;
• wherein the plurality of second electrodes are arranged in a plurality of groups of second electrodes extending from one of the first pair of electrodes, a first group in the plurality of groups of second electrodes includes a plurality of adjacent second electrodes extending less than halfway across the aperture and having a first length and a second group of the plurality of groups of second electrodes extending at least halfway across the aperture and having a second length different than the first length,
• wherein the plurality of second electrodes include a third group of electrodes extending from the another first electrode and extending at least halfway across the aperture and between each of the adjacent electrodes of the first group in the plurality of groups of second electrodes, and
• generating a surface acoustic wave, upon application of electrical current to the pair of the first electrodes.