| 摘要 |
<p>A communication system for communicating RF signals at a plurality of communication standards through a common antenna is disclosed. The communication system includes a transmitter having transmitter outputs for generating transmit band signals in the transmit bands of each supported communication standard, and a receiver having receiver inputs for receiving receive band signals in the receive bands of each supported communication standard. The communication system also includes a plurality of RF switches. Each RF switch couples either the transmitter output or the receiver input associated with a particular communication standard to the antenna. Whether the communication unit is in transmit mode or receive mode, a harmonic filter coupled between each RF switch and the common antenna filters out harmonics of the transmit band and receive band signals. Each harmonic filter has a passband substantially encompassing the transmit and receive bands of the particular communication standard associated with the coupled RF switch.</p> |
