| 摘要 |
A mobile telephone repeater with a variable bandwidth is disclosed. The repeater comprises an uplink and downlink, each being provided with amplifie r chains (6). Each chain comprises at least two band pass filter units (10, 11 ) coupled in series and having controllable pass bands, which at least partial ly overlap each other. The centre frequency of the filter units are controllabl e so as to make the bandwidth of the resulting pass band variable. Consequentl y, the effective bandwidth of the amplifier chain is controllable.
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