US 12,074,624 B2
Radio-frequency front-end circuit and communication apparatus
Hiroyuki Kani, Kyoto (JP); and Tomohiro Sano, Kyoto (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed on May 3, 2023, as Appl. No. 18/311,426.
Application 18/311,426 is a continuation of application No. 17/380,400, filed on Jul. 20, 2021, granted, now 11,677,427.
Application 17/380,400 is a continuation of application No. PCT/JP2020/001664, filed on Jan. 20, 2020.
Claims priority of application No. 2019-009819 (JP), filed on Jan. 23, 2019.
Prior Publication US 2023/0275609 A1, Aug. 31, 2023
Int. Cl. H04B 1/04 (2006.01); H04B 1/00 (2006.01); H04B 1/16 (2006.01)
CPC H04B 1/1615 (2013.01) [H04B 1/006 (2013.01); H04B 1/04 (2013.01); H04B 2001/0408 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A radio-frequency front-end circuit comprising:
an antenna terminal;
a transmit filter configured to pass a transmit signal of a time division duplexing (TDD) band;
a receive filter configured to pass a receive signal of the TDD band;
a filter configured to pass a radio frequency signal of a frequency division duplexing (FDD) band;
a switch configured to switch a connection between the antenna terminal and the transmit filter, a connection between the antenna terminal and the receive filter, and a connection between the antenna terminal and the filter, and to simultaneously connect the antenna terminal to the transmit filter and to the filter, and to simultaneously connect the antenna terminal to the receive filter and to the filter; and
a phase adjusting circuit configured to adjust a phase difference between:
a radio frequency signal of the TDD band in response to the switch simultaneously connecting the antenna terminal to the transmit filter and to the filter, and
the radio frequency signal of the TDD band in response to the switch simultaneously connecting the antenna terminal to the receive filter and to the filter.