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High frequency device, filter, duplexer, communication module, and communication apparatus










Image Number 15 for United States Patent #8350643.

In a high frequency device, resonators (IDT capacitors) that function as capacitors are included in a lumped constant balun included in a filter or duplexer, and furthermore, the resonance frequency of the IDT capacitors is set higher than the passband frequency of the filter. This improves the capacitor Q value, thus enabling the realization of a low-loss balance filter.








 
 
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