Elastic surface wave device comprising dummy electrodes

A surface acoustic wave device comprising:

• a pair of reflectors;
• and
• an interdigital transducer arranged between the pair of reflectors,
• the interdigital transducer comprising a plurality of cross electrodes, a plurality of dummy electrodes, and a conductive plate, the cross electrodes and the dummy electrodes extending substantially parallel to one another and alternating with one another, the conductive plate including an edge,
• wherein each of the cross electrodes and the dummy electrodes extends in a substantially elongated shape from the edge of the conductive plate,
• wherein each of the cross electrodes is longer than each of the dummy electrodes,
• wherein each of the cross electrodes and the dummy electrodes includes a tail contacting the edge of the conductive plate,
• wherein the width of the tail of one of the dummy electrodes is different from the width of the tail of a cross electrode neighboring the one dummy electrode, and wherein the tail width of the dummy electrode and the tail width of the cross electrode are weighted along a traveling direction of a surface acoustic wave.

A surface acoustic wave device comprising:

• a pair of reflectors;
• and
• an interdigital transducer arranged between the pair of reflectors,
• the interdigital transducer comprising a plurality of cross electrodes, a plurality of dummy electrodes, and a conductive plate, the cross electrodes and the dummy electrodes extending substantially parallel to one another and alternating with one another, the conductive plate including an edge,
• wherein each of the cross electrodes and the dummy electrodes extends in a substantially elongated shape from the edge of the conductive plate,
• wherein each of the cross electrodes is longer than each of the dummy electrodes,
• wherein each of the cross electrodes and the dummy electrodes includes a tail contacting the edge of the conductive plate,
• wherein the width of the tail of one of the dummy electrodes is different from the width of the tail of a cross electrode neighboring the one dummy electrode, and
• wherein the tail width of the dummy electrode and the tail width of the cross electrode vary along the traveling direction of the surface acoustic wave comprising a triangular, rectangular or trigonometric wave.

A surface acoustic wave device comprising:

• a pair of reflectors;
• and
• an interdigital transducer arranged between the pair of reflectors,
• the interdigital transducer comprising a plurality of cross electrodes, a plurality of dummy electrodes, and a conductive plate, the cross electrodes and the dummy electrodes extending substantially parallel to one another and alternating with one another, the conductive plate including an edge,
• wherein each of the cross electrodes and the dummy electrodes extends from the edge of the conductive plate, and is in a form of substantially elongated strip having a thickness,
• wherein each of the cross electrodes is longer than each of the dummy electrodes,
• wherein each of the cross electrodes and the dummy electrodes includes a tail contacting the edge of the conductive plate, and
• wherein a thickness of the tail of one of the dummy electrodes is different from a thickness of the tail of a cross electrode neighboring the one dummy electrode.

A surface acoustic wave device comprising:

• a pair of reflectors;
• and
• an interdigital transducer arranged between the pair of reflectors,
• the interdigital transducer comprising a plurality of cross electrodes, a plurality of dummy electrodes, and a conductive plate, the cross electrodes and the dummy electrodes extending substantially parallel to one another and alternating with one another, the conductive plate including a non-linear edge,
• wherein each of the cross electrodes and the dummy electrodes extends in a substantially elongated shape from the non-linear edge of the conductive plate,
• wherein each of the cross electrodes is longer than each of the dummy electrodes,
• wherein each of the cross electrodes includes a first end facing away from the non-linear edge of the conductive plate, the first ends of the cross electrodes being substantially aligned with one another,
• wherein each of the dummy electrodes includes a second end facing away from the non-linear edge of the conductive plate, the second ends of the dummy electrodes being substantially aligned with one another, and
• wherein each of the cross electrodes and the dummy electrodes includes a tail contacting the edge of the conductive plate, and wherein a tail thickness of the dummy electrode is different from a thickness of at least a portion of the cross electrode.