| CPC H03H 7/0115 (2013.01) [H03H 7/461 (2013.01); H03H 7/463 (2013.01)] | 9 Claims |
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1. A branching filter comprising:
an input port;
a first output port;
a second output port;
a third output port;
a fourth output port;
a first diplexer including a first input end connected to the input port, a first output end, and a second output end;
a second diplexer including a second input end directly connected to the first output end, a third output end directly connected to the first output port, and a fourth output end directly connected to the second output port; and
a third diplexer including a third input end directly connected to the second output end, a fifth output end directly connected to the third output port, and a sixth output end directly connected to the fourth output port, wherein
the first output port is a port that selectively passes a signal of a frequency within a first passband toward an outside of the branching filter,
the second output port is a port that selectively passes a signal of a frequency within a second passband higher than the first passband toward the outside of the branching filter,
the third output port is a port that selectively passes a signal of a frequency within a third passband higher than the second passband toward the outside of the branching filter, and
the fourth output port is a port that selectively passes a signal of a frequency within a fourth passband higher than the third passband toward the outside of the branching filter.
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