US 11,699,983 B2
Directional coupler
Daisuke Tokuda, Kyoto (JP); Ryangsu Kim, Kyoto (JP); Yasushi Shigeno, Kyoto (JP); and Katsuya Shimizu, Kyoto (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed on Sep. 25, 2020, as Appl. No. 17/32,281.
Application 17/032,281 is a continuation of application No. PCT/JP2019/012956, filed on Mar. 26, 2019.
Claims priority of application No. 2018-062240 (JP), filed on Mar. 28, 2018.
Prior Publication US 2021/0013858 A1, Jan. 14, 2021
Int. Cl. H03H 7/40 (2006.01); H01P 5/18 (2006.01)
CPC H03H 7/40 (2013.01) [H01P 5/18 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A directional coupler comprising:
a main line;
a sub-line;
a variable impedance circuit configured to terminate a first end of the sub-line; and
a variable filter circuit that is connected to a second end of the sub-line,
wherein the variable filter circuit comprises:
a filter in a filter path;
a bypass path;
a first switch connected in series in the filter path;
a second switch connected between ground and the filter path; and
a third switch connected in series in the bypass path,
wherein the variable filter circuit is configured to selectively connect the second end of the subline to the filter and the filter path, or to the bypass path,
wherein the third switch is on a substrate,
wherein as seen in a plan view of the substrate, a wiring element is between an input terminal and an output terminal of the third switch, and
wherein the wiring element has a ground potential.