Bulk acoustic wave filter for second harmonic residue reduction
OwnerZhaogeng Xu, Li Chen +1inventors
InventorsZhaogeng Xu, Li Chen, Yiliu Wang
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Abstract
Aspects of this disclosure relate to acoustic wave filters with second harmonic emission suppression. In an embodiment, an acoustic wave filter includes a first bulk acoustic wave resonator, a second bulk acoustic wave resonator in anti-parallel with the first bulk acoustic wave resonator, and a passive impedance element in series with the first bulk acoustic wave resonator. The passive impedance element can reduce an imbalance in resonant frequency between the first and second bulk acoustic wave resonators. Other embodiments of acoustic wave filters with second harmonic emission suppression are disclosed. Related multiplexers, radio frequency modules, wireless communication devices, and methods are disclosed.
Claims20
An acoustic wave filter with second harmonic emission suppression, the acoustic wave filter comprising:
- a first bulk acoustic wave resonator;
- a second bulk acoustic wave resonator in anti-parallel with the first bulk acoustic wave resonator;
- and
- a passive impedance element in series with the first bulk acoustic wave resonator and in parallel with the second bulk acoustic wave resonator, the passive impedance element being an inductor, the passive impedance element configured to cause to an imbalance in resonant frequency between the first and second bulk acoustic wave resonators to be reduced, and the acoustic wave filter configured to filter a radio frequency signal.
An acoustic wave filter with second harmonic emission suppression, the acoustic wave filter comprising:
- a first bulk acoustic wave resonator;
- a second bulk acoustic wave resonator in anti-parallel with the first bulk acoustic wave resonator, the first and second bulk acoustic wave resonators are shunt resonators;
- and
- a passive impedance element in series with the first bulk acoustic wave resonator, the passive impedance element configured to cause to an imbalance in resonant frequency between the first and second bulk acoustic wave resonators to be reduced, the acoustic wave filter is configured to filter a radio frequency signal, the acoustic wave filter is included in a multiplexer, and the first and second bulk acoustic wave resonators are included in a first shunt stage of the acoustic wave filter from a common node of the multiplexer.
A multiplexer with second harmonic emission suppression, the multiplexer comprising:
- a first acoustic wave filter including a first bulk acoustic wave resonator, a second bulk acoustic wave resonator in anti-parallel with the first bulk acoustic wave resonator, and a passive impedance element in series with the first bulk acoustic wave resonator and in parallel with the second bulk acoustic wave resonator, the passive impedance element being an inductor, the passive impedance element configured to cause to an imbalance in resonant frequency between the first and second bulk acoustic wave resonators to be reduced;
- and
- a second acoustic wave filter coupled to the first acoustic wave filter at a common node.
Dependencies are inferred from the claim text.