Patent ID: 7155184

Claim:
A tri-band receiving terminal of a mobile communications system, comprising: a filter unit which filters signals in each of three frequency bands; a dual-band radio frequency (RF) receiver including first and second inputs, which respectively receive first and second signals; a switching unit disposed on an exterior of the dual-band RF receiver and having an output connected to the second input of the dual-band RF receiver, and having a first input for receiving a first-band signal and a second input for receiving a second-band signal and which switches between selection of the first-band signal and the second-band signal, the second-band signal being of a different frequency than the first-band signal, wherein the switching unit switches between selection of the first-band signal and the second-band signal based on a band select signal; and an impedance-matching unit including a first matching unit connected to the first input of the switching unit and a second matching unit connected to the second input of the switching unit, and which adjusts an impedance mismatch before the second input of the RF receiver caused by the switching unit, wherein the dual-band RF receiver receives a third-band signal at the first input of the dual-band RF receiver, the third-band signal being of a different frequency than the first-band signal and the second-band signal.