Surface acoustic wave device and method of designing the same
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A method for manufacturing a surface acoustic wave device including forming a single-phase unidirectional transducer based on calculating frequency responses of the positive and negative conversion losses along a surface acoustic wave propagation direction by coupling-of-modes equations, where A.sup.+ (x) and A.sup.- (x) are the mode amplitudes of the surface acoustic waves propagated respectively in the positive direction (forward direction) and negative direction (backward direction) of the x axis and where boundary conditions of the initial and final analytical points are respectively expressed by A.sup.+ (0)=0 and A.sup.- (L)=0. The method includes setting A.sup.+ (0)=0 (or A.sup.- (L)=0) as a boundary condition, setting A.sup.- (0) (or A.sup.+ (L)) to an arbitrary value as an initial value of A.sup.- (0) (or A.sup.+ (L)), and calculating coupling-mode-equations while repeatedly altering A.sup.- (0) (or A.sup.+ (L)) until A.sup.- (L)=0 (or until A.sup.+ (0)=0).