Patent ID: 6870302

Claim:
An interdigital transducer comprising: a plurality of one-wavelength basic units of a single phase unidirectional transducer each having three electrode fingers within one wavelength; an upper bus bar electrode from which some of said electrode fingers are connected; and a lower bus bar electrode from which the other electrode fingers are connected, wherein one of the three electrode fingers of each one-wavelength basic unit of said single phase unidirectional transducer is wider than the two other electrode fingers, and said single phase unidirectional transducer comprises at least two sections, and wide electrode fingers of those one-wavelength basic units of said single phase unidirectional transducer which constitute one section of said single phase unidirectional transducer are connected to one of said upper bus bar electrode or said lower bus bar electrode, and wide electrode fingers of those one-wavelength basic units of said single phase unidirectional transducer which constitute the other section of said single phase unidirectional transducer are connected to the other of said upper bus bar electrode or said lower bus bar electrode.