CPC H04B 1/18 (2013.01) [H03F 3/193 (2013.01); H03F 3/245 (2013.01); H04B 1/52 (2013.01); H04B 7/04 (2013.01); H03F 2200/165 (2013.01); H03F 2200/294 (2013.01)] | 20 Claims |
1. A frontend circuit applied to carrier aggregation using a plurality of communication frequency bands including a first communication frequency band and a second communication frequency band, the frontend circuit comprising:
a wide-band filter that passes a radio frequency signal of the first communication frequency band and a radio frequency signal of the second communication frequency band; and
a first filter that passes the radio frequency signal of the first communication frequency band selectively,
wherein the first communication frequency band is close to or overlaps the second communication frequency band,
wherein, in the carrier aggregation, the radio frequency signal of the first communication frequency band and the radio frequency signal of the second communication frequency band pass through the wide-band filter,
wherein the first communication frequency band or the second frequency communication band includes a receive frequency band that is lower than a transmit frequency band, and
wherein, in a single use of the first communication frequency band, the radio frequency signal of the first communication frequency band passes through the first filter.
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