| CPC H03H 9/0009 (2013.01) [H01Q 1/50 (2013.01); H03H 7/38 (2013.01); H03H 7/40 (2013.01); H03H 7/48 (2013.01); H03H 9/0014 (2013.01); H03H 9/542 (2013.01); H03H 9/547 (2013.01); H03H 9/6403 (2013.01); H03H 9/6483 (2013.01); H03H 9/6489 (2013.01); H03H 9/706 (2013.01); H03H 9/725 (2013.01); H03H 2009/02204 (2013.01); H03H 2210/015 (2013.01); H03H 2210/025 (2013.01); H03H 2210/036 (2013.01); H03H 2210/04 (2013.01); H03H 2240/00 (2013.01); H03H 2250/00 (2013.01); H03J 2200/10 (2013.01)] | 13 Claims |

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1. A tunable resonator comprising:
a first resonator module including a first resonator arranged in series with a first switch;
a second resonator module including a second resonator arranged in series with a second switch; and
a first variable capacitor coupled across the first and the second resonator module, wherein:
a) a passband of the tunable resonator is
i) a function of a fixed resonant frequency of each of the first and the second resonator modules; and
ii) to be modulated by opening or closing the first switch or the second switch,
b) a stopband of the tunable resonator is to be modulated by the first variable capacitor.
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