| 摘要 |
PROBLEM TO BE SOLVED: To easily inexpensively provide a signal detection circuit capable of detecting a transmission signal even when transmitting timings are overlapped between plural pieces of radio equipment using adjacent frequencies. SOLUTION: The signal detection circuit for detecting a received signal from second communication equipment performing communication by using an adjacent frequency when a first communication equipment communicates with other communication equipment in a high frequency band inputs the received signal from the second communication equipment branched by a coupler and the local signal of the first communication equipment to a mixer to convert the received signal to a base band signal. Further, the transmission signal of the first communication equipment is attenuated from the output of the mixer, the received signal from the second communication equipment is detected. |
