US 12,294,133 B2
Directional coupler
Kenta Seki, Kyoto (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed on Jan. 12, 2023, as Appl. No. 18/153,407.
Application 18/153,407 is a continuation of application No. PCT/JP2021/026286, filed on Jul. 13, 2021.
Claims priority of application No. 2020-124712 (JP), filed on Jul. 21, 2020.
Prior Publication US 2023/0178870 A1, Jun. 8, 2023
Int. Cl. H01P 5/18 (2006.01); H01P 1/10 (2006.01); H01P 1/12 (2006.01); H01P 1/213 (2006.01); H03H 7/01 (2006.01)
CPC H01P 5/18 (2013.01) [H01P 1/127 (2013.01); H01P 1/213 (2013.01); H03H 7/0161 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A directional coupler comprising:
a main line;
a sub line electromagnetically coupled to the main line;
an output terminal connected to a first end of the sub line;
a first filter connected between the first end of the sub line and the output terminal;
a second filter having a pass band higher than a pass band of the first filter;
a termination circuit connected to a second end of the sub line;
a third filter connected between the second end of the sub line and the termination circuit; and
a fourth filter having a pass band higher than a pass band of the third filter,
wherein a first end of the second filter is connected to the output terminal, and a second end of the second filter is terminated, and
wherein a first end of the fourth filter is connected to the termination circuit, and a second end of the fourth filter is terminated.