Directional coupler
AssigneeMurata Manufacturing Co., Ltd.
InventorsKenta Seki, Yasushi Shigeno, Daisuke Tokuda, Ryangsu Kim, Katsuya Shimizu, Kazuhito Osawa
Life of this patent
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Abstract
A directional coupler includes a main line, a first sub-line to be electromagnetically coupled to the main line, a second sub-line to be electromagnetically coupled to the main line, and a coupling terminal configured to output a detection signal corresponding to a radio frequency signal that is transmitted through the main line, the first sub-line and the second sub-line are different in length from each other, and connection between the first sub-line and the coupling terminal and connection between the second sub-line and the coupling terminal are switched.
Claims9
A directional coupler comprising:
- a main line;
- a first sub-line electromagnetically coupled to the main line;
- a second sub-line electromagnetically coupled to the main line;
- a coupling terminal configured to output a detection signal corresponding to a radio frequency signal transmitted through the main line;
- a loaded circuit;
- and
- a third switch circuit configured to not connect a first end of the first sub-line to the loaded circuit in a situation in which the first sub-line is connected to the coupling terminal, and is configured to connect the first end of the first sub-line to the loaded circuit in a situation in which the first sub-line is not connected to the coupling terminal, wherein:
- the first sub-line and the second sub-line have different lengths,
- an electrical length of the first sub-line is different than an electrical length of the first sub-line and the loaded circuit together, and
- a connection of the coupling terminal is configured to be switched between the first sub-line and the second sub-line.
Dependencies are inferred from the claim text.