To address coexistence issues for the adjacent Wi-Fi and 5G portions of the spectrum, rethink the resonators that make up bandpass filters in 5G mobile devices. The proliferation of 4G LTE networks, the deployment of new 5G networks, and the pervasive nature of Wi-Fi are driving a dramatic increase in the number of RF bands that smart-phones and other mobile devices must support (Fig. 1). Each band must be isolated using filters to avoid interference that will drain battery life, reduce data speeds, and cause dropped calls.
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