| 摘要 |
<p>An acoustic wave filter (10) made by the steps of providing a suitable substrate and processing the substrate to provide a lattice filter (14) having balanced electrical input (17, 17') and output (18, 18') circuits and an inline coupled resonator filter (12), disposed thereon. The processing step further includes steps of (i) disposing a first transducer (20) having a balanced electrical output (16, 16') on the substrate, (ii) disposing a second transducer (25) including an unbalanced electrical input circuit (15') at a first acoustic aperture of the first transducer (20), wherein the second tranducer (25) is acoustically coupled to the first transducer (20) and the first (20) and second (25) transducers comprise the inline coupled resonator filter (12) and (iii) disposing interconnections between the first transducer (20) and the lattice filter (14) to provide a balanced electrical output signal from the first transducer to the balanced electrical input of the lattice filter (14).</p> |
