CPC H04B 1/10 (2013.01) [H03H 7/0115 (2013.01); H03H 7/0153 (2013.01); H04B 1/1027 (2013.01)] | 20 Claims |
1. A tunable filter with harmonic rejection, the tunable filter comprising:
a first inductor;
a second inductor mutually coupled with the first inductor; and
a tunable capacitance circuit electrically connected to the first inductor, the tunable capacitance circuit including N switches configured to adjust effective capacitance of the tunable capacitance circuit to tune harmonic rejection of the tunable filter for at least 2×2N harmonics, N being a positive integer greater than 1, and the tunable filter being arranged to filter a radio frequency signal.
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