Bei & Ocean
Dual-track surface-wave filter
The present invention relates to an integrated dual-track surface-wave filter comprising two input interdigital transducers, an output interdigital transducer, and a shield stripe therebetween, which are integrated on a piezoelectric wafer. The integrated dual-track surface-wave filter is characterized in that the two input interdigital transducers share one output interdigital transducer and one comb-like electrode that has a bus bar arranged at the middle thereof, and in that main lobe regions of apodized envelope curves on the two parallel input interdigital transducers are staggered to be at cross overlapping positions, and in that the bus bar on the common comb-like electrode is segmented to connect respective fingers on the two input interdigital transducers. In this manner, the present invention effectively narrows the chip area occupied, consumes less substrate materials and decreases the volume of the encapsulated enclosure, thereby reducing the manufacture cost effectively.
Shoulder Electronics Co., Ltd.
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inventional inventional additional inventional inventional
Shanlin Weibiao
Ni Wang