| 摘要 |
PURPOSE: An FEU(Front End Unit) system for suppressing interference signals in a base station is provided to suppress interference signals due to active and passive IMD(Inter Modulation Distortion) components by separately processing transmitting channels using a plurality of duplexers, channel BPFs(Band Pass Filters), HPAs(High Power Amplifiers), etc. CONSTITUTION: An FEU system for suppressing interference signals in a base station consists of an HPA(11), a channel BPF(12), the first duplexer(13), the second duplexer(14), the first coupler(15), the first LNA(Low Noise Amplifier)(18), the third duplexer(16), the second coupler(17), and the second LNA(19). The HPA(11) executes high power amplification for RF signals to be transmitted to mobile stations. The channel BPF(12) executes filtering for the amplified RF signals. The first duplexer(13) is composed of two TX_BPFs(4M,11M) to remove interference signals after separating the filtered RF signals by channels. The second duplexer(14) is composed of a TX_BPF(4M) to filter the RF signals passed through the TX_BPF(4M) of the first duplexer(13) and an RX_BPF(25M) to filter the RF signals received from mobile stations. The first coupler(15) couples and outputs RF signals according to transmitting/receiving paths. The first LNA(18) executes low noise amplification for the RF signals passed through the RX_BPF(25M) of the second duplexer(14). The third duplexer(16) is composed of a TX_BPF(11M) to filter the RF signals passed through the TX_BPF(11M) of the first duplexer(13) and an RX_BPF(25M) to filter the RF signals received from mobile stations. The second coupler(17) couples and outputs RF signals according to transmitting/receiving paths. The second LNA(19) executes low noise amplification for the RF signals passed through the RX_BPF(25M) of the third duplexer(16).
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