Patent ID: 8442577
Filing Date: 2013-05-14
Classification: H04B

Abstract:
1. A wireless communication apparatus, comprising: a first communication circuit, arranged to process signals according to a first wireless communication protocol working at a first frequency band; a second communication circuit, arranged to process signals according to a second wireless communication protocol working at a second frequency band, wherein the second wireless communication protocol is different from the first wireless communication protocol; an antenna, shared between the first communication circuit and the second communication circuit; and a combiner, having a first port coupled to the first communication circuit, a second port coupled to the second communication circuit, and a third port coupled to the antenna, the combiner comprising a first blocking element placed between the third port and the first port for allowing signal components in the first frequency band to pass there through and for blocking or attenuating signal components in the second frequency band to provide a first signal path between the antenna and the first communication circuit; and a second blocking element placed between the third port and the second port for allowing the signal components in the second frequency band to pass there through and for blocking or attenuating the signal components in the first frequency band to provide a second signal path between the antenna and the second communication circuit; wherein the first blocking element comprises a capacitor, and the second blocking element comprises two inductors connected in series, wherein the first blocking element is implemented utilizing a high pass or band pass circuits, and the second blocking element is implemented utilizing a low pass or band pass circuits, and wherein the combiner further comprises at least one notch filter, having a first end and a second end respectively coupled to the second port and a reference voltage, for passing signal components of all frequencies except those in a stop band, wherein the stop band at least overlaps the first frequency band.