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1.发明授权公开(公告)号：US10938369B1
公开(公告)日：2021-03-02
申请号：US16657133
申请日：2019-10-18
Applicant: Amazon Technologies, Inc.
Inventor： Adrian Gradinaru
Abstract: Technologies directed to sharing an antenna and a frequency band between coexistence radios are described herein. In one device, semi-active front-end circuitry includes a directional coupler and a phase-shifter circuit coupled to two radios that use the same antenna and the same frequency band. The phase-shifter circuit and directional coupler create an isolation null at an isolated port of the directional coupler that cancels a copy of an incident wave of a transmit signal being applied at an input port of the directional coupler. The isolation null permits the second radio to receive a receive signal concurrently with the first radio transmitting the transmit signal.
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公开(公告)号：US10581155B1
公开(公告)日：2020-03-03
申请号：US16144743
申请日：2018-09-27
Applicant: Amazon Technologies, Inc.
Inventor： Adrian Gradinaru , Morris Yuanhsiang Hsu , Cheol Su Kim , Jaiyoung Park
Abstract: Antenna structures and methods of operating the same are described. One apparatus includes a processing device that executes an active interference cancellation (AIC) algorithm and radio frequency front-end (RFFE) circuitry coupled to the processing device. The RFFE circuitry includes two RF couplers, a fixed-delay filter, and an interference compensation circuit part of an electrical path between the two RF couplers. The AIC algorithm is operable to control the interference compensation circuit to adjust a phase, an amplitude or both of a copy of a first RF signal transmitted on a first antenna to remove corresponding interference in a second RF signal received at a second antenna that is caused by the first RF signal. The processing device triggers a re-calibration in the AIC algorithm when the digital values, received from a power detector circuit, indicate a change in impedance that exceeds a threshold.
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