Radar Feed Network Buffer Isolation for Crosstalk Reduction
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Solution Overview
Problem
Millimeter wave radar devices experience crosstalk and leakage signals due to limited isolation of power amplifiers and electromagnetic coupling between antennas, which deteriorate the quality of radar signals and maps produced.
Innovation Solution
The implementation of a radar device with a feed network comprising multiple buffers that can be activated or deactivated to route radar frequency signals specifically to active antenna interface units, forming a binary tree structure to enhance power suppression and reduce crosstalk between antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple antennas are operated sequentially to improve radar map accuracy, then measurement precision is improved, but crosstalk and leakage signals occur due to limited isolation of power amplifiers and electromagnetic coupling between antennas
Solution Approach 1:
The patent segments the signal path by introducing buffer amplifiers at each antenna interface unit. These buffers isolate the signal flow between the feed network and individual antennas, preventing electromagnetic coupling and crosstalk while maintaining sequential antenna operation for improved radar mapping accuracy.
Solution Approach 2:
The buffer amplifiers act as intermediary elements between the feed network and antenna interface units. They provide impedance matching and signal isolation, serving as a mediator that prevents harmful electromagnetic coupling while enabling the sequential operation of multiple antennas for enhanced measurement precision.
2Reliability
If power amplifiers are switched between antennas to enable sequential operation, then antenna isolation is improved, but power suppression between antenna ports deteriorates due to electromagnetic coupling
Solution Approach 1:
The patent applies local quality by placing buffer amplifiers at each antenna interface unit specifically where signal isolation is needed. This localized approach provides targeted impedance matching and signal isolation at each antenna port, improving antenna isolation reliability while maintaining proper power suppression through localized impedance control.
3Power
If buffers are added to route signals specifically to active antenna interface units, then power suppression is enhanced, but device complexity increases
Solution Approach 1:
The patent implements dynamic buffering where buffer amplifiers are selectively activated or deactivated based on which antenna interface unit is currently active. This dynamic approach enhances power suppression by ensuring buffers are only present in the signal path when needed, reducing unnecessary complexity while maintaining effective power isolation between antenna ports.
Data Source
AI summary
A radar device includes a RF signal source, two or more antenna interface units, a feed network, and a control unit. The RF signal source is arranged to provide a RF signal; each of the antenna interface units includes an antenna port and one of the following: an amplifier and a mixer; the feed network includes two or more buffers, each buffer has an active and an inactive state; the control unit is arranged to generate or receive a selection signal which specifies none, one, or more of the antenna interface units as active antenna interface units and the remaining antenna interface units as inactive antenna interface units; the control unit is arranged to activate and deactivate the buffers in dependence on the selection signal so as to feed the RF signal to the none, one, or more active antenna interface units and not to the inactive antenna interface units.