CPC H03H 7/40 (2013.01) [H01P 5/18 (2013.01)] | 7 Claims |
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.
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