CPC H03H 9/25 (2013.01) [H03H 9/02834 (2013.01); H03H 9/6406 (2013.01); H03H 9/6483 (2013.01); H04B 1/0057 (2013.01)] | 18 Claims |
1. A multiplexer for filtering radio frequency signals, the multiplexer comprising:
a first filter having a first passband that is a lowest passband of all filters of the multiplexer, the first filter including a series inductor and a plurality of acoustic resonators coupled to a common node by way of the series inductor, the plurality of acoustic resonators starting with a first shunt acoustic resonator from the common node, and each ladder stage of the first filter including a shunt acoustic resonator of the plurality of acoustic resonators, the first filter coupled to the common node without an intervening switch;
a second filter coupled to the common node and having a second passband that is above the first passband, the series inductor and the first shunt acoustic resonator of the first filter together arranged to increase a reflection coefficient of the first filter in the second passband; and
a third filter coupled to the common node via a switch, the first, second, and third filters being included in the multiplexer, the third filter having a third passband that is a highest passband of all filters of the multiplexer.
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