Multi-Antenna VSWR Sensing for Close-Range Angular Detection
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Solution Overview
Problem
Existing wireless circuitry in electronic devices struggles to accurately estimate distance and characterize the location and orientation of external objects within a blind spot near the device, leading to inaccuracies and potential regulatory violations due to excessive radio-frequency energy absorption.
Innovation Solution
Incorporating voltage standing wave ratio (VSWR) sensors with multiple antennas to measure radio-frequency signals, allowing processors to identify angular locations and adjust communications or beam directions based on these measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless circuitry uses traditional distance estimation methods, then it can operate with simple circuitry, but it creates a blind spot near the device where accurate detection is impossible
Solution Approach 1:
The patent segments the detection function by adding VSWR sensors to existing antennas, creating dedicated measurement capabilities within the wireless circuitry. This segmentation allows the system to divide detection into range estimation (using traditional methods) and proximity detection (using VSWR), resolving the blind spot issue without completely redesigning the circuitry.
Solution Approach 2:
The patent makes the antennas multi-functional by coupling VSWR sensors to them, allowing the same antenna structure to serve both traditional wireless communication and proximity/range detection purposes. This universality eliminates the need for separate detection hardware, maintaining simplicity while improving reliability.
2Speed
If wireless circuitry increases transmit power to improve detection range, then it can detect objects farther away, but it exceeds regulatory limits on specific absorption rate and maximum permissible exposure
Solution Approach 1:
The patent implements dynamic power adjustment based on real-time VSWR measurements. When an external object is detected within the blind spot, the system automatically reduces transmit power to comply with SAR and MPE limits. This dynamic adaptation allows the system to optimize detection range while preventing harmful energy absorption.
Solution Approach 2:
The VSWR sensors provide continuous feedback about the presence and proximity of external objects. This feedback loop enables the wireless circuitry to adjust transmit power levels in real-time, ensuring regulatory compliance while maintaining effective detection capability. The system monitors VSWR changes and modulates power accordingly.
3Measurement precision
If wireless circuitry uses a single antenna for communication, then it simplifies the device design, but it cannot accurately characterize the location and orientation of external objects
Solution Approach 1:
The patent segments the antenna system into multiple independently monitored elements, each with its own VSWR sensor. This segmentation enables the system to measure VSWR at different spatial locations, providing angular location information and improving the ability to characterize external object position and orientation.
Solution Approach 2:
By adding angular location detection capability through multi-antenna VSWR measurements, the patent transitions from one-dimensional range detection to two-dimensional spatial characterization. This dimensional enhancement allows the system to determine not just distance but also angular position of external objects.
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
Enhances the ability to detect and accurately locate external objects at close ranges, ensuring compliance with regulatory limits on specific absorption rate and maximum permissible exposure, while improving spatial ranging accuracy.
Implementation Method 1
The VSWR sensors may gather VSWR measurements from radio-frequency signals transmitted using the set of antennas
Data Source
AI summary
An electronic device may include wireless circuitry having a set of two or more antennas coupled to voltage standing wave ratio (VSWR) sensors. The VSWR sensors may gather VSWR measurements from radio-frequency signals transmitted using the set of antennas. The antennas may be disposed on one or more substrates and/or may be formed from conductive portions of a housing. Control circuitry may process the VSWR measurements to identify the ranges between each of the antennas in the set of antennas and an external object. The control circuitry may process the ranges to identify an angular location of the external object with respect to the device. The control circuitry may adjust subsequent communications based, adjust the direction of a signal beam produced by a phased antenna array, identify a user input, or perform any other desired operations based on the angular location.