Transversally coupled resonator filter
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United States of America Patent
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Jul 13, 2004
Grant Date -
Jan 16, 2003
app pub date -
Aug 6, 2002
filing date -
Dec 11, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a transverse-mode-coupled resonator filter based on surface acoustic waves. The object of the invention is to modify such resonator filters, in which there are disposed adjacent to one another on a substrate (1) a plurality of one-port resonator structures (2; 3), which comprise two strip reflectors (22 and 23; 32 and 33) and an interdigital transducer (21; 31) and together form a waveguide for surface acoustic waves, in such a way that the insertion loss of the filters is reduced, especially by reducing the damping due to the cascade connection. This object is achieved by the fact that at least one of the one-port resonator structures (2; 3) differs from the other one-port resonator structures by the ratio of the finger width to the spacing (216) of the finger centers (214; 215) and by the ratio of the width of the reflector strips (221; 231; 321; 331) to the spacing (226; 236) of the centers (224; 225 and 234; 235) of the reflector strips (221; 231; 321; 331). The invention is applicable in particular to bandpass filters with a relative bandwidth on the order of 0.1 percent and to resonators for oscillators.
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