| 摘要 |
<p>A communication device includes: a first signal generator generating an outgoing signal with a first frequency; a transmission terminal outputting the outgoing signal generated by the first signal generator; a receiving terminal receiving an incoming signal; a mixer mixing the incoming signal received by the receiving terminal with the outgoing signal generated by the first signal generator; a second signal generator generating a test signal with a second frequency different from the first frequency; and a coupling circuit coupling a line through which the test signal generated by the second signal generator is transferred with a line connecting to the receiving terminal to input the test signal into the mixer.</p> |
