Abstract
The past decades' phenomenal and rapid growth in cell phone use and, more recently, in smartphone adoption is apparent to everyone. What has not be so clearly articulated is that underlying this growth is a larger growth in the demand for smartphone filters and duplexers. As a result of fourth-generation longterm evolution wireless technology (4G)-and in light of coming fifth-generation (5G) requirements-the number of filters needed in smartphones has exploded.

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