| 摘要 |
<p>The device (50) has four band pass filters (611-614) that are centered respectively on four frequencies (F1-F4). Each band pass filter is arranged with an access point and another access point. Each access point is connected to an access point of one band pass filter of the four band pass filters. A branch forms an access port of the latter access point, and each of a set of other branches is connected to the latter access point of one of the band pass filters of the set of band pass filters.</p> |
