Wideband RF Antenna for Micro-Localization
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Solution Overview
Problem
Conventional RF-based micro-localization systems face limitations in achieving millimeter and sub-millimeter resolution due to distorted emission patterns caused by electromagnetic interference and multipath effects, leading to reduced accuracy and robustness.
Innovation Solution
The development of RF antennas with asymmetric designs that convert unbalanced signals to balanced signals, featuring a conductive housing with separate cavities and a conductive wall to shield the emitting element from electromagnetic interference, and the use of wideband antennas to mitigate multipath interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional RF antennas are used, then the system can operate with simple structure, but the emission pattern becomes distorted due to electromagnetic interference and multipath effects
Solution Approach 1:
The antenna housing is divided into multiple cavities (first cavity and second cavity) separated by conductive walls. This segmentation isolates different functional components, preventing electromagnetic interference between them while maintaining overall system accuracy.
Solution Approach 2:
The antenna feed structure employs asymmetric design with asymmetric portions in contact with the port and symmetric portions in contact with the emitting element. This asymmetric configuration converts unbalanced signals to balanced signals, reducing multipath effects and improving emission pattern accuracy.
2Reliability
If the antenna feed is exposed to electromagnetic interference, then the manufacturing process is simpler, but the emission pattern becomes distorted
Solution Approach 1:
Conductive walls are introduced as intermediary structures between the antenna feed and the external environment. These walls shield the emitting element from electromagnetic interference while allowing the antenna feed to maintain its electrical coupling function.
Solution Approach 2:
The conductive housing provides localized shielding at critical areas where electromagnetic interference would affect the emitting element. The shielding is applied specifically where needed rather than throughout the entire structure, optimizing protection while minimizing complexity.
3Reliability
If narrowband antennas are used, then the antenna design is simpler, but multipath interference cannot be mitigated
Solution Approach 1:
The antenna is designed to operate as a wideband antenna, changing the frequency bandwidth parameter from narrowband to wideband operation. This enables the antenna to mitigate multipath interference by operating across multiple frequencies, improving robustness against multipath effects.
4Reliability
If symmetric antenna feed is used, then the signal transmission is balanced, but the conversion from unbalanced to balanced signals cannot be achieved
Solution Approach 1:
The antenna feed incorporates both asymmetric portions (in contact with the port) and symmetric portions (in contact with the emitting element). This asymmetric-symmetric transition structure enables conversion from unbalanced signals at the port to balanced signals at the emitting element, improving signal quality.
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
These RF antennas enable accurate localization of objects to within 10 cm or less, improving the accuracy and robustness of micro-localization systems by reducing distortions and multipath effects, thereby enhancing precision in applications like autonomous navigation and virtual reality.
Implementation Method 1
a conductive housing with separate cavities and a conductive wall to shield the emitting element from electromagnetic interference
Implementation Method 2
The RF antenna may be configured to transmit a first RF signal having a first center frequency to a target device and receive, from the target device, a second RF signal having a second center frequency
Data Source
AI summary
Radio-frequencies (RF) antennas for use in micro-localization systems are described. The RF antennas described herein may enable localization of objects with high resolutions, such as in the order of one centimeter or less. The RF antennas may be further configured to reduce range error variability across different directions, so that the accuracy of a micro-localization system is substantially the same regardless of the position of the object. An illustrative RF antenna includes an emitting element having first and second conductive traces patterned to reduce the angular impulse delay variability of the RF antenna. The first conductive trace may form a first arm of a spiral and the second conductive trace may form a second arm of the spiral. At least one parameter of the spiral may be selected to reduce the angular impulse delay variability of the RF antenna.