| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce leakage of a signal from a transmitting unit to a receiving unit in a wireless communication system which provides wireless communication and in which the transmitting unit and the receiving unit share an antenna. <P>SOLUTION: A coupling apparatus divides a radio frequency (RF) transmitting signal and an RF receiving signal in a transceiver with a transmitting unit and a receiving unit sharing an antenna and includes: a four-port circuit which has a first port, second port, third port and fourth port, and in which a through-path is formed between the first port and the second port, a signal input to the first port is coupled to the fourth port, a signal input to the second port is coupled to the third port, the first port and the fourth port are isolated, and the second port and the third port are isolated; and an attenuator for attenuation and output of a signal output from the third port. The RF transmitting signal is input to the first port, the RF receiving signal is input to the second port, and outputs of the attenuator and the fourth port are provided to the receiving unit. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
