Qorvo Us, Inc.

Jeffery D Galipeau

Kelly M Lear

Nikolaus Klemmer

Chris Levesque

Embodiments of an acoustic filter are disclosed. In some embodiments, a bandpass filter is included in a passband signal path, the passband signal path is connected between a first terminal and a second terminal. A first bandstop filter is located in a first stopband signal path, the first stopband signal path connected at the first terminal. Additionally, a second bandstop filter is located in a second stopband signal path, the second stopband signal path is connected at the second terminal.

Acoustic filters with improved return loss

A reactance cancelling radio frequency (RF) circuit array is disclosed. The reactance cancelling RF circuit array includes multiple RF circuits each coupled to one or two adjacent RF circuits by one or two pairs of coupling mediums each having a respective length less than one-quarter wavelength. In one aspect, an RF input signal is first split across the RF circuits and then combined to form an RF output signal. As a result, each RF circuit requires a lower power handling capability to process a portion of the RF input signal. In another aspect, each pair of the coupling mediums can cause reactance cancellation in each reactance-cancelling pair of the RF circuits. By coupling the RF circuits via the coupling mediums and enabling splitting-combining among the RF circuits, it is possible to miniaturize the reactance cancelling RF circuit array for improved performance across a wide frequency spectrum.

Reactance cancelling radio frequency circuit array

Disclosed is a Bulk Acoustic Wave (BAW) assist filter structure with a BAW resonator stacked onto an integrated passive device (IPD). In exemplary aspects disclosed herein, the BAW filter structure includes a transducer with electrodes and a piezoelectric layer between the electrodes. The IPD is electrically coupled to the BAW resonator and provides a high frequency of operation. In such a configuration, the BAW assist filter structure has a low insertion loss and mitigates electrical length parasitic loss due to the close electrically proximity of the BAW resonator stacked onto the IPD. Further, the BAW assist filter structure is able to filter high frequencies and provides improved filter performance and greater flexibility in design of a filter transfer function.

Growing community of inventors

Apopka, FL, United States of America

Jeffery D Galipeau