| 摘要 |
The filter has a piezoelectric substrate (1) provided with a number of single gate resonator structures (2,3) next to one another, provided by 2 strip reflectors (22,23; 32,33), enclosing a planar hollow space, joined together by short-circuit strips (222,223,232,233,322,332) between the reflector strips (221,231,321,331) and an interdigital transducer (21,31) within the planar hollow space. At least one single gate resonator structure has a different ratio between the width and the relative spacing of the fingers of the interdigital transducer and a different ratio between the width and relative spacing of the reflector strips.
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