| 摘要 |
PURPOSE: A filter is provided to use for a communication system and small space. CONSTITUTION: Two surface wave filter filters(21,22) are located on piezoelectric substrate(20), and electro-acoustic filter(22) structure like the form of interdigital structure(23) is in the filter. A filter(21,22) and multi-filter formed by piezoelectric substrate(20) are positioned in single housing(24). electric contact is linked to a part of input signal(25,26), a part of output signal(27,28) and short terminal(29) with contact wires(30). In need of filtering much signal, many surface wave filter structure can be formed on single substrate.
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