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

Claim 10:
11. A wireless communication system, comprising:
an antenna;
one or both of a receiver circuit and a transmitter circuit;
a tunable filter connected between the antenna and the one or both of the receiver circuit and the transmitter circuit, comprising:
a tunable bandpass filter having a broad pass band connected between the antenna and the one or both of the receiver circuit and the transmitter circuit, the tunable bandpass filter configured to provide out-of-band rejection about a tunable frequency center having a wide tuning range;
a plurality of fixed frequency notch resonator filters, each of a different corresponding fixed frequency center, connected in parallel between a ground and a line connecting the tunable bandpass filter to the antenna and/or the one or both of the receiver circuit and the transmitter circuit, configured to provide high rejection at the corresponding fixed frequency center, the fixed frequency centers configured such that when the frequency center of the tunable bandpass filter is between the frequency centers of a pair of the plurality of fixed frequency notch resonator filters having adjacent frequency centers, the frequency center of the pair of the plurality of fixed frequency notch resonator filters will be within the pass band of the tunable bandpass filter;
a plurality of switches whereby each of a corresponding one of the plurality of fixed frequency filters are selectively connectable to the line connecting the tunable bandpass filter to the antenna and/or the one or both of the receiver circuit and the transmitter circuit by a corresponding one of the switches; and

a processor connected to the tunable filter and switches and configured to:
tune the frequency center of the tunable bandpass filter to be between the corresponding frequency centers of a first pair of the plurality of fixed frequency notch resonator filters having adjacent frequency centers; and
with the frequency center of the tunable bandpass filter tuned to be between the corresponding frequency centers of the first pair of the fixed frequency notch resonator filters, selectively turn on the switches corresponding to the first pair of the fixed frequency notch resonator filters.