Radio frequency multiplexers
AssigneeResonant Inc.
InventorGregory L. Hey-Shipton
Life of this patent
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Abstract
There are disclosed radio frequency multiplexers and methods of designing radio frequency multiplexers. A radio frequency multiplexer includes three or more band-pass filters having respective passbands, each band-pass filter comprising two or more acoustic resonators. A first end of each of the three or more band-pass filters is connected to a respective branch port. A second end of each of the three or more band-pass filters is connected to a common node without an intervening phasing network. A shunt reactive element connected between the common node and ground.
Claims10
A radio frequency multiplexer, comprising:
- three or more band-pass filters having respective passbands, each band-pass filter comprising two or more acoustic resonators, wherein
- a first end of each of the three or more band-pass filters is connected to a respective branch port, and
- a second end of each of the three or more band-pass filters is connected to a common node without an intervening phasing network;
- and
- a shunt reactive element connected between the common node and ground.
A method for designing radio frequency multiplexer having three or more channels, the method comprising:
- designing respective band-pass filters for the three or more channels, each band-pass filter meeting respective requirements when a second end of the band-pass filter is connected to a nominal load impedance;
- combining models of the band-pass filters to form a model of a hypothetical multiplexer, wherein
- a second end of each band-pass filter is connected to a common node with an ideal connection, and
- a shunt reactive element and the nominal load impedance are connected, in parallel, between the common node and ground;
- and
- modifying the design of one or more of the band-pass filters to provide an improved multiplexer design where each of the band-pass filters meets the respective requirements when the second end of the band-pass filter is connected to the common node without an intervening phasing network.
Dependencies are inferred from the claim text.