Patent ID: 7948924
Filing Date: 2011-05-24
Classification: H04B

Abstract:
1. A Radio Frequency (RF) front-end apparatus in a wireless communication system, the apparatus comprising: a first BandPass Filter (BPF) for selectively passing a signal except having a first band; a second BPF for selectively passing a signal except having a second band; at least one circulator for isolating a signal transmission path and a signal reception path; a plurality of switches for controlling the signal transmission path and the signal reception path; a plurality of connectors for installing antennas; a transmission amplifier for amplifying a transmission signal; and a first reception amplifier and a second reception amplifier for amplifying a reception signal, wherein each of the plurality of switches has N number of terminals and operates as an N−1 pole switch at each terminal, wherein each of the N number of terminals function as at least one of an input terminal and an output terminal and the input and output functions of the terminals are assigned by electronic control, wherein the plurality of switches comprises a first switch having a first terminal connecting with an output terminal of the transmission amplifier, a second terminal connecting with the first BPF, a third terminal connecting with an input terminal of the first reception amplifier, and a fourth terminal connecting with the second BPF; a second switch having a first terminal connecting with the first BPF, a second terminal connecting with the circulator, a third terminal connecting with the second BPF, and a fourth terminal connecting with the circulator; a third switch having a first terminal connecting with an input terminal of the first reception amplifier and the third terminal of the first switch, a second terminal connecting with the second BPF, and a third terminal connecting with the input terminal of the second reception amplifier; and a fourth switch having a first terminal connecting with the second BPF and a second terminal connecting with the circulator.