公开(公告)号：US10700759B2

公开(公告)日：2020-06-30

申请号：US16267808

申请日：2019-02-05

Applicant: Huawei Technologies Co., Ltd.

Inventor： Weinan Li ,  Xiaoran Li ,  Jian Liang

IPC: H04L1/02 ,  H04B7/08 ,  H04B1/525 ,  H04B1/10

Abstract: The present application discloses a diversity receiver and a terminal. The diversity receiver includes a first main channel and a first diversity channel, the first main channel includes an antenna diplexer and a first main transmission channel, and the first diversity channel includes a tunable bandpass filter and a first diversity receiving channel. The first diversity receiving channel is coupled to a diversity antenna by using the tunable bandpass filter, and the tunable bandpass filter is configured to: adjust a passband bandwidth of the tunable bandpass filter according to a band bandwidth of a first transmit signal generated by the first main transmission channel and a band bandwidth of a first receive signal received from the diversity antenna, and perform bandpass filtering based on the passband bandwidth on the first receive signal.

公开(公告)号：US10651919B2

公开(公告)日：2020-05-12

申请号：US16267808

申请日：2019-02-05

Applicant: Huawei Technologies Co., Ltd.

Inventor： Weinan Li ,  Xiaoran Li ,  Jian Liang

IPC: H04L1/02 ,  H04B7/08 ,  H04B1/525 ,  H04B1/10

Abstract: The present application discloses a diversity receiver and a terminal. The diversity receiver includes a first main channel and a first diversity channel, the first main channel includes an antenna diplexer and a first main transmission channel, and the first diversity channel includes a tunable bandpass filter and a first diversity receiving channel. The first diversity receiving channel is coupled to a diversity antenna by using the tunable bandpass filter, and the tunable bandpass filter is configured to: adjust a passband bandwidth of the tunable bandpass filter according to a band bandwidth of a first transmit signal generated by the first main transmission channel and a band bandwidth of a first receive signal received from the diversity antenna, and perform bandpass filtering based on the passband bandwidth on the first receive signal.

公开(公告)号：US09899988B2

公开(公告)日：2018-02-20

申请号：US14710244

申请日：2015-05-12

Applicant: Huawei Technologies Co., Ltd.

Inventor： Yongchang Yu ,  Tao Liu ,  Weinan Li

IPC: H03J5/14 ,  H04W88/00 ,  H04B1/04 ,  H03K17/60 ,  H03K17/687 ,  H03K17/693 ,  H03K17/10

CPC classification number: H03J5/14 ,  H03J2200/06 ,  H03K17/10 ,  H03K17/102 ,  H03K17/60 ,  H03K17/687 ,  H03K17/693 ,  H03K2217/0018 ,  H03K2217/0054 ,  H04B1/04 ,  H04W88/00

Abstract: A switch, an antenna tuner, and a radio frequency apparatus are provided. The switch includes: 2N successively serially connected transistors. In the 2N successively serially connected transistors, control ends of any two transistors with closest odd sequence numbers are coupled to each other through a first resistor, and control ends of any two transistors with closest even sequence numbers are coupled to each other through a second resistor; a control end of an n-th transistor is coupled to a first control signal in a switch control signal, and a control end of an (n+1)-th transistor is coupled to the first control signal, where n is an integer that is greater than or equal to 1 and is less than or equal to 2N−1, N is an integer greater than or equal to 2, and the first control signal is used to control turn-on or turn-off of the switch.

公开(公告)号：US09853802B2

公开(公告)日：2017-12-26

申请号：US14695553

申请日：2015-04-24

Applicant: Huawei Technologies Co., Ltd.

Inventor： Weinan Li ,  Tao Liu ,  Jian Liang

IPC: H04B7/005 ,  H04L5/14 ,  H04B1/04 ,  H04B1/18 ,  H04B1/00 ,  H04L25/02 ,  H04W36/00

CPC classification number: H04L5/1415 ,  H04B1/0057 ,  H04B1/0458 ,  H04B1/18 ,  H04L25/028 ,  H04W36/0055

Abstract: A radio frequency circuit. In the circuit, a first directional coupler receives a second transmit signal, uses a part of the second transmit signal as a third transmit signal, directly sends the third transmit signal to a first port of a circulator, and obtains a first coupling signal from the second transmit signal; the circulator outputs the third transmit signal through a second port; an impedance tuner transmits the third transmit signal to an antenna port and transmits, to the second port of the circulator, a first input signal from the antenna port; the circulator inputs the first input signal to a second directional coupler through a third port; the second directional coupler obtains a second coupling signal from the first input signal; and a controller adjusts impedance of the impedance tuner according to the first coupling signal and the second coupling signal.