Multiplexers using weakly-coupled networks in RF front end circuitry
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United States of America Patent
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Jan 16, 2018
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app pub date -
Oct 30, 2015
filing date -
Nov 3, 2014
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Abstract
Multiplexing circuitry is disclosed that includes filtering circuitry, which provides a first transfer function between a common port and a first port and a second transfer function between the common port and a second port. The first transfer function and second transfer function provide a first passband and a second passband, respectively. The first transfer function also has a stopband provided within the second passband of the second transfer function because the filtering circuitry includes a first filter path and a second filter path, wherein the second filter path has a first and second parallel resonant circuit provided in shunt with respect to the second filter path and weakly coupled to one another. The weak coupling between the first parallel resonant circuit and the second parallel resonant circuit naturally provides the stopband in the first transfer function within the second passband of the second transfer function.
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