This paper presents a full-duplex transceiver system design operating with a single channel using a single antenna for both transmitting and receiving paths. To implement such a system, the self-interference is necessary to be eliminated. From literatures on RF interference cancellation, there has not been any suitable technique to deal with a single antenna. In this light, this work initially proposes the technique to cancel the self-interference by utilizing on-the-shelf components. The measurement results indicate that the proposed system can reduce the level of self-interference about 75 dB, which is better than others in literatures.