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US 2025/0357952 A1Published application
Out-of-band rejection for acoustic-wave filters
AssigneeSkyworks Solutions, Inc.
InventorMohammad Jehad Almalkawi
Life of this patent
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Abstract
Aspects of this disclosure relate to bandpass filters with enhanced out of band rejection. The bandpass filters include a stage that is modified using a network of three inductors two of which are mutually coupled inductors. Related methods, radio frequency systems, radio frequency modules, and wireless communication devices are also disclosed.
Claims21
(canceled)
A radio frequency filter configured to allow transmission within a passband, the radio frequency filter comprising:
- a first port and a second port;
- a series acoustic resonator and a first inductor connected in series between the first port and a node;
- a second inductor connected between the node and the second port;
- a shunt acoustic resonator between the node and a reference potential;
- and
- a third inductor connected between the first port and the second port.
3 more elements
A radio frequency front end comprising:
- a multiplexer including a first port, a plurality of second ports, and a plurality of first filters, each of the plurality of first filters connected between the first port and a respective one of the plurality of second ports, each of the plurality of first filters having at least one filter cell including a third port and a fourth port, a series acoustic resonator and a first inductor connected in series between the third port and a node, a second inductor connected between the node and the fourth port, a shunt acoustic resonator connected between the node and a reference potential, and a third inductor connected between the third port and the fourth port, the first inductor and the second inductor mutually coupled;
- and
- one or more power amplifiers, the multiplexer configured to multiplex transmit signals generated by the one or more power amplifiers.
A mobile device comprising:
- an antenna;
- a multiplexer including a plurality of first filters, each of the plurality of first filters having at least one filter cell including a series acoustic resonator and a first inductor connected in series between a first port and a node, a second inductor connected between the node and a second port, a shunt acoustic resonator connected between the node and a reference potential, and a third inductor connected between the first port and the second port, the first inductor and the second inductor mutually coupled;
- and
- one or more power amplifiers, the multiplexer configured to multiplex transmit signals generated by the one or more power amplifiers.
1 more element
Dependencies are inferred from the claim text.