Patent ID: 7831203

Claim:
A radio frequency repeater is built-in a donor antenna receiving a transmitted sender signal from a base station to a mobile telecommunication radio frequency repeater and a coverage antenna radiating a repeated signal in said radio frequency repeater to a radio service area, and to prevent oscillation to cancel a feedback interference signal between said donor antenna and said coverage antenna, comprising: a 1 st duplexer means for filtering a received signal from said donor antenna; a downlink low noise amplifier means for amplifying filtered signal only for use-band in said 1 st duplexer; a downlink frequency down converter means for receiving a signal which is amplified by said downlink low noise amplifier; a downlink feedback cancellation module means for separating a received signal from the base station being inputted to said donor antenna and a feedback interference signal being inputted to said donor antenna radiating from said coverage antenna in a signal of said downlink frequency down converter and canceling the feedback interference signal; a downlink frequency up converter means for up-converting frequency into a high frequency band for radiating a signal which the feedback interference signal is cancelled by said downlink feedback ICM (Interference Cancellation Module) to the service area; a downlink power amplifier means for amplifying a signal of said downlink frequency up converter; a 2 nd duplexer means for outputting to the coverage antenna with filtering the amplified signal in said downlink power amplifier, and for filtering a signal of a mobile telecommunication terminal which is radiated in the service area and received by said coverage antenna, conversely; an uplink low noise amplifier means for amplifying low noise to receive filtered signal only for use band in said 2 nd duplexer; an uplink frequency down-converter means for receiving the amplified signal by said uplink low noise amplifier and down-converting a frequency of the amplified signal by said uplink low noise amplifier; an uplink feedback cancellation module means for separating a received signal from a terminal of the service area being inputted to said coverage antenna and a feedback interference signal being inputted to the coverage antenna radiating from said donor antenna in a signal of said uplink frequency down-converter and canceling the feedback interference signal; an uplink frequency up converter means for up-converting a frequency into a high frequency band for radiating a signal which the feedback signal is cancelled by said uplink feedback ICM to the service area; an uplink power amplifier means for amplifying the signal of said uplink frequency up converter; and a 1 st duplexer means for outputting a filtered signal of the amplified signal in said uplink power amplifier to the donor antenna.