| 摘要 |
In an RF front-end having a plurality of signal paths connectable to an internal antenna or an external antenna, an antenna switch part is used to select either the internal or the external antenna. In the antenna switch part, two series switches are used to operatively connect to the same connection point in each signal path. These two series switches are separately connected to two different antennas for selecting one of the antennas in order to route the signals in that signal path. For providing further isolation between signal paths, each signal path can be connected to a shunt switch near the connection point. Only the shunt switch connected to the selected signal path is operated in an open position, all the other shunt switches are operated in a closed position.
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