Patent ID: 11923830
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. An apparatus, comprising:
an input port;
an output port;
means, connected between the input port and the output port, for providing out-of-band rejection about a tunable frequency center having a wide tuning range and having a broad pass band;
means, connected between a ground and a line connecting the means for providing out-of-band rejection to the input port and/or the output port, for providing high rejection at a selected one or more of a plurality of fixed frequency centers, the fixed frequency centers configured such that, when the frequency center of the means for providing out-of-band rejection is between the frequency centers of an adjacent pair of the plurality of fixed frequency centers of the means for providing high rejection at the selected one or more of the, the frequency center of the adjacent pair of the plurality of fixed frequency centers will be within the pass band of the means for providing out-of-band rejection about a tunable frequency center;
means for selecting the one or more of a plurality of fixed frequency centers for providing high rejection; and
a control circuit configured to:
tune the frequency center of the means for providing out-of-band rejection about a tunable frequency center to be between a first pair of the plurality of fixed frequency centers having adjacent frequency centers; and
with the frequency center of the means for providing out-of-band rejection about a tunable frequency center tuned to be between the first pair of fixed frequency centers having adjacent frequency centers, select the first pair of fixed frequency centers to provide high rejection.