| CPC H03H 9/605 (2013.01) [H03H 9/02228 (2013.01); H03H 9/171 (2013.01); H04B 1/40 (2013.01)] | 17 Claims |

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1. A passband filter comprising:
a first connection;
a second connection;
a third connection;
a first substrate;
a second substrate;
one or more resonators of a first type connected in series between the first connection and the second connection, the one or more resonators of the first type being disposed on the first substrate; and
one or more resonators of a second type connected from between the first connection and the second connection to the third connection, the one or more resonators of the second type being disposed on the second substrate.
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