US 12,283,977 B2
High frequency circuit, diversity module, and communication apparatus
Masanori Kishimoto, Kyoto (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed on Sep. 8, 2022, as Appl. No. 17/930,554.
Application 17/930,554 is a continuation of application No. PCT/JP2021/011278, filed on Mar. 18, 2021.
Claims priority of application No. 2020-071312 (JP), filed on Apr. 10, 2020.
Prior Publication US 2023/0006700 A1, Jan. 5, 2023
Int. Cl. H04B 1/00 (2006.01); H04B 1/04 (2006.01)
CPC H04B 1/0057 (2013.01) [H04B 1/04 (2013.01); H04B 2001/0408 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A high frequency circuit comprising:
a first transmission circuit that is configured to transmit a high frequency signal of a first communication system; and
a second transmission circuit that is configured to transmit high frequency signals of the first communication system and a second communication system, the second communication system being different from the first communication system,
wherein the first transmission circuit comprises:
a first transmission filter having a pass band that comprises a transmission band of a first communication band of the first communication system, and
a first reception filter having a pass band that comprises a reception band of the first communication band of the first communication system,
wherein the second transmission circuit comprises:
a duplexer that comprises a second transmission filter and a second reception filter, the second transmission filter having a pass band comprising a transmission band of a second communication band of the second communication system, and the second reception filter having a pass band comprising a reception band of the second communication band of the second communication system,
a third reception filter having a pass band comprising the reception band of the first communication band of the first communication system,
a first power amplifier that is connected to an input terminal of the second transmission filter,
a first low noise amplifier, and
a switch that is configured to exclusively selectively connect the first low noise amplifier to the second reception filter or the third reception filter,
wherein the first communication band and the second communication band have a same frequency band, and
wherein the third reception filter is different from the second reception filter.