Robot Antenna Array Layout for Omnidirectional RF Reception
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Solution Overview
Problem
Traditional moving robots face challenges with antenna performance due to nearby metal objects or materials with high loss tangent characteristics, leading to unintended changes in antenna characteristics and degradation of emission performance.
Innovation Solution
The moving robot incorporates an antenna assembly with a substrate and multiple isotropic antennas arranged in a specific configuration, including a first antenna and multiple second antennas positioned at equal distances, to minimize distortion and interference by emitting RF signals uniformly in all directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional directional antenna is used in a moving robot, then the antenna can be simpler in structure, but the antenna performance degrades due to distortion from reflected waves and intensity or phase differences
Solution Approach 1:
The patent divides a single directional antenna into multiple isotropic antennas arranged in an array. Each antenna element is simple in structure, but their collective arrangement creates omnidirectional coverage, eliminating the need for complex directional beamforming while maintaining reliable signal emission in all directions.
Solution Approach 2:
The patent combines multiple isotropic antennas into a unified antenna array system. By merging several simple antenna elements with identical radiation patterns, the system achieves omnidirectional coverage and eliminates the distortion problems associated with traditional directional antennas, thereby improving reliability without increasing individual component complexity.
2Volume of moving object
If metal objects or materials with high loss tangent characteristics are arranged near the antenna, then the robot structure can be more compact, but the antenna characteristics change unintentionally and emission performance degrades
Solution Approach 1:
The patent combines multiple isotropic antennas in an array configuration, which creates a more uniform radiation pattern that is less sensitive to nearby metal objects. The distributed arrangement of multiple antennas reduces the impact of local electromagnetic interference compared to a single antenna, maintaining reliable performance in compact robot designs.
Solution Approach 2:
The patent changes the antenna radiation characteristics from directional to isotropic by using multiple antenna elements. This parameter change in the radiation pattern makes the system more robust to environmental interference from metal objects, as the uniform omnidirectional coverage distributes energy more evenly and reduces susceptibility to local reflections and losses.
3Device complexity
If the antenna is arranged to be directed to a moving direction, then the antenna can be simpler, but distortion occurs depending on intensity or phase difference of radio waves in receiving reflected waves
Solution Approach 1:
The patent segments a single directional antenna into multiple isotropic antenna elements arranged in an array. This segmentation allows the system to receive signals from all directions simultaneously without the phase distortion and intensity variations that occur with directional antennas, thereby improving measurement precision while keeping individual antenna elements simple.
Solution Approach 2:
The isotropic antenna array serves multiple functions: it provides omnidirectional coverage for signal reception, eliminates the need for directional alignment, and reduces distortion from reflected waves. This universal configuration replaces the need for complex directional tracking mechanisms, maintaining simplicity while improving accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables the moving robot to receive RF signals accurately from all directions, minimizing errors in measuring distance and angle with external devices, and ensuring reliable wireless communication.
Implementation Method 1
the antenna undergoes an unintended change in characteristics of the antenna or degradation of emission performance when there is another metal object or a material with high loss tangent characteristics arranged on the periphery because of radio signal emission characteristics of the antenna
Implementation Method 2
The moving robot may further include an RF absorber configured to absorb RF signals, the radio frequency absorber arranged between the antenna assembly and the UWB communication module
Data Source
AI summary
A moving robot includes a main body; a moving module configured to move the main body; a communication device including an antenna module arranged in a highest portion within the main body and performing wireless communication with an external device; and at least one processor configured to control the moving module based on a signal received from the external device through the communication device so that the main body moves toward the external device, wherein the antenna module includes a substrate; a first antenna arranged on an upper surface of the substrate; and a plurality of second antennas arranged on the upper surface of the substrate to be at the same distance from the first antenna.