Isolating circuit of transmitting and receiving paths in same frequency carrier
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United States of America Patent
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Issued Date -
Sep 7, 2006
app pub date -
Oct 6, 2005
filing date -
Mar 2, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An isolating circuit of transmitting and receiving paths in the same frequency carrier comprises a directional coupler, a phase adjuster, and a mixer. The directional coupler couples a transmitting signal on the transmitting path to the phase adjuster. There is a 90-degree phase difference between an output signal of the phase adjuster and the transmitting signal. The mixer shifts the output signal of the phase adjuster by a 90-degrees phase. Due to poor isolation, a leakage signal is leaked from a transmitting path to a receiving path. The leakage signal is mixed with an output signal of the mixer on the receiving path, and the two signals cancel each other.
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