Harmonic Lobe Beam Steering for RF Interference Control
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Solution Overview
Problem
Current radio frequency (RF) communication systems face challenges in effectively managing harmonic lobes, which can interfere with signal transmission and reception, leading to reduced performance and compliance issues with emissions testing.
Innovation Solution
The implementation of an antenna array with signal conditioning circuits and a beam control circuit that dynamically steers the receive beam based on the direction of harmonic lobes, allowing for detuning of the fundamental lobe and adjusting the angle of the receive beam, while also detecting harmonic power levels to optimize beamforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is used to focus signal transmission, then signal strength and communication performance are improved, but harmonic lobes are generated that cause interference and emissions compliance issues
Solution Approach 1:
The patent detects harmonic lobes and converts this harmful effect into a useful tool by using harmonic lobe direction information to guide fundamental lobe beam steering, thereby directing beams toward intended recipients while avoiding interference zones
Solution Approach 2:
The system continuously detects harmonic power levels and uses this feedback to dynamically adjust beam steering angles, creating a closed-loop control system that optimizes signal transmission while minimizing harmonic interference
2Measurement precision
If traditional emissions testing is performed at multiple locations, then compliance accuracy is improved, but testing time and complexity increase
Solution Approach 1:
The system performs preliminary detection of harmonic lobe directions and power levels before conducting full emissions testing, allowing it to pre-identify critical testing locations and omit measurements at positions away from harmonic lobes
Solution Approach 2:
The testing process is segmented into two stages: rapid harmonic lobe detection to identify critical zones, followed by targeted emissions measurement only at those specific locations, rather than uniform testing across all possible positions
Data Source
AI summary
Apparatus and methods related to beamforming of harmonics are provided herein. In certain implementations, a communications device for operating in a cellular network is provided. The communications device includes a plurality of signal conditioning circuits configured to generate a plurality of transmit signals, an antenna array configured to radiate a transmit beam and including a plurality of antenna elements each thereof operatively associated with a corresponding one of the plurality of signal conditioning circuits, and a beam control circuit configured to control the plurality of signal conditioning circuits to provide beam steering of the transmit beam based on a direction of one or more harmonic lobes of the transmit beam.