| 摘要 |
Provided is a high-frequency switch (10A) formed by a first switch circuit (22a) connected in parallel to a first ?/4 signal transmission path (18a) for transmitting a transmission signal from a transmission terminal (16) and a second switch circuit (22b) connected in parallel to a second ?/4 signal transmission path (18b) for transmitting a reception signal to a reception terminal (20). The high-frequency switch (10A) further includes a directivity coupler (36) which has the first ?/4 signal transmission path (18a) as a constituent element and detects a reflected wave of the transmission signal. The directivity coupler (36) includes: the first ?/4 signal transmission path (18a); a ?/4 signal line (38) arranged to oppose to the first ?/4 signal transmission path (18a); a reflected wave output terminal (40) connected to one end of the ?/4 signal line (38); and a terminal resistor (42) connected to the other end of the ?/4 signal line (38).
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