Patent ID: 6751470
Filing Date: 2004-06-15
Classification: H04B

Abstract:
A radio-frequency front-end (100) for use with a radio-frequency signal processor (200) in a multi-band mobile terminal, the mobile terminal capable of operating in a plurality of frequency bands including a first frequency band and a different second frequency band, the front-end adapted to convey signals to and from the signal processor via a connection means (150), wherein the mobile terminal comprises:an antenna system (10); a first receiver (522) for receiving first signals in the first frequency band from the antenna system; a second receiver (523) for receiving second signals in the second frequency band from the antenna system; a first transmitter (531) for providing third signals in the first frequency band to the antenna system for transmission; and a second transmitter (532) for providing fourth signals in the second frequency band to the antenna system for transmissions, characterized in that the antenna system comprises: a first receiving antenna (12a, 12b), operable in the first frequency band and operatively connected to the first receiver (522), for allowing the first receiver to receive the first signals; a second receiving antenna (12c, 12d), operable in the second band and operatively connected to the second receiver (523), for allowing the second receiver to receive the second signals; a first transmitting antenna (12g), operable in the first band and operatively connected to the first transmitter (531), for transmitting the third signals; and a second transmitting antenna (12h), operable in the second band and operatively connected to the second transmitter (532), for transmitting the fourth signals, said front-end further characterized by: a first frequency filter (322), operatively connected to the first receiver (522) and the first receiving antenna (12a, 12b), for frequency filtering the first signals; a second frequency filter (323), operatively connected to the second receiver (523) and the second receiving antenna (12c, 12d), for frequency filtering the second signals; a third frequency filter (324), operatively connected to the first transmitter (531) and the first transmitting antenna, for frequency filtering the third signals; and a fourth frequency filter (325), operatively connected to the second transmitter (532) and the second transmitting antenna (12h), for frequency filtering the fourth signals.