CPC H03H 7/463 (2013.01) [H01Q 1/50 (2013.01); H03H 7/0115 (2013.01); H03H 7/0138 (2013.01); H03H 7/1758 (2013.01); H03H 7/1766 (2013.01); H03H 9/02007 (2013.01); H03H 9/205 (2013.01); H03H 9/542 (2013.01); H03H 9/605 (2013.01); H03H 9/64 (2013.01); H03H 9/706 (2013.01); H03H 9/725 (2013.01); H04B 1/0475 (2013.01); H04B 1/1036 (2013.01); H04B 1/40 (2013.01); H04L 5/1461 (2013.01)] | 20 Claims |
1. A multiplexer comprising:
a first filter configured to filter a radio frequency signal, the first filter including a hybrid passive/acoustic filter and a non-acoustic LC filter cascaded with the hybrid passive/acoustic filter, the hybrid passive/acoustic filter including at least a first acoustic resonator in parallel with a first inductor, the first acoustic resonator and the first inductor in series with a second inductor and a second acoustic resonator in series with a third inductor, and at least a first non-acoustic passive component having at least a first capacitor in parallel with a fourth inductor, the first capacitor and the fourth inductor connected in parallel with the second acoustic resonator, a second non-acoustic passive component having at least a second in parallel with a fifth inductor, the second capacitor and the fifth inductor further connected in parallel with the first acoustic resonator, and the non-acoustic LC filter configured to suppress a harmonic of the radio frequency signal, the non-acoustic LC filter including a first LC resonant circuit connected to a series LC tank, a second LC resonant circuit connected to the series LC tank, and a first bridge capacitor coupled to an input and the series LC tank, and a second bridge capacitor coupled to the first LC resonant circuit and the series LC tank; and
a second filter coupled to the first filter at a common node.
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