Surface-acoustic-wave (SAW) filter with an electrical conductor having a floating potential

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

• providing a piezoelectric layer;
• and
• providing an electrode structure on a surface of the piezoelectric layer, the providing of the electrode structure comprising:
• forming a first comb-shaped structure comprising a first busbar and a first set of fingers extending from the first busbar;
• forming a second comb-shaped structure comprising a second busbar and a second set of fingers extending from the second busbar;
• and
• forming at least one electrical conductor between the first comb-shaped structure and the second comb-shaped structure such that a gap separates the at least one electrical conductor from the first comb-shaped structure and the second comb-shaped structure, wherein the at least one electrical conductor comprises:
• a first electrical conductor positioned between the first busbar and a finger of the second set of fingers;
• a second electrical conductor positioned between the second busbar and a finger of the first set of fingers;
• a third electrical conductor positioned between the first busbar and another finger of the second set of fingers;
• and
• a fourth electrical conductor positioned between the second busbar and another finger of the first set of fingers.

A surface-acoustic-wave filter comprising:

• an electrode structure, the electrode structure comprising:
• two comb-shaped structures configured to have different potentials, the two comb-shaped structures forming a barrier region between a busbar of one of the two comb-shaped structures and fingers of another one of the two comb-shaped structures;
• and
• at least one electrical conductor positioned within the barrier region and configured to have a floating potential, wherein the at least one electrical conductor comprises:
• a first electrical conductor positioned between a busbar of a first comb-shaped structure of the two comb-shaped structures and a finger of a second comb-shaped structure of the two comb-shaped structures;
• a second electrical conductor positioned between a busbar of the second comb-shaped structure and a finger of the first comb-shaped structure;
• a third electrical conductor positioned between the busbar of the first comb-shaped structure and another finger of the second comb-shaped structure;
• and
• a fourth electrical conductor positioned between the busbar of the second comb-shaped structure and another finger of the first comb-shaped structure.

An apparatus comprising:

• a surface-acoustic-wave filter comprising:
• a piezoelectric layer;
• and
• an electrode structure disposed on a surface of the piezoelectric layer, the electrode structure comprising:
• a first comb-shaped structure;
• a second comb-shaped structure;
• and
• at least one electrical conductor positioned between the first comb-shaped structure and the second comb-shaped structure such that a gap separates the at least one electrical conductor from the first comb-shaped structure and the second comb-shaped structure, wherein:
• a first distance between the at least one electrical conductor and the first comb-shaped structure causes an admittance between the at least one electrical conductor and the first comb-shaped structure to be approximately equal to zero;
• and
• a second distance between the at least one electrical conductor and the second comb-shaped structure causes an admittance between the at least one electrical conductor and the second comb-shaped structure to be approximately equal to zero.