Injection-Locked Oscillator for Low-Power mm-Wave Tracking
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Solution Overview
Problem
Conventional directional antenna configurations for mobile devices exhibit limited sensitivity and high power consumption, making them unsuitable for accurate and efficient mm-wave tracking.
Innovation Solution
The use of an injection-locked oscillator and a retro-directive antenna array with phased array elements, coupled with a beacon generator and processing circuitry, allows for high-sensitivity mm-wave tracking with low power consumption by detecting frequency offsets and steering beacons to achieve accurate positional detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional directional antenna configurations are used in mobile devices, then the device size constraint is satisfied, but the sensitivity and power consumption characteristics deteriorate
Solution Approach 1:
The patent divides the antenna system into multiple antenna elements arranged in a specific geometric configuration. Each element contributes to the overall tracking function, allowing the system to achieve high sensitivity without requiring a large overall antenna structure. The segmented approach enables the antenna array to maintain a compact form factor while providing superior angular resolution and tracking performance.
Solution Approach 2:
The patent transitions from conventional two-dimensional antenna arrangements to a three-dimensional geometric configuration. This dimensional change allows the antenna system to achieve better spatial discrimination and angular resolution within a compact volume, resolving the contradiction between small size and high sensitivity by utilizing vertical or depth dimensions that were not fully exploited in traditional planar antenna designs.
2Measurement precision
If high-resolution power measurements are used to achieve acceptable angular resolution, then the measurement precision improves, but the power consumption increases
Solution Approach 1:
The patent replaces power-intensive digital signal processing and high-resolution power measurement systems with a more efficient geometric-based tracking approach. By using the spatial relationships and time-of-flight measurements in conjunction with the specific antenna geometry, the system achieves high angular resolution without relying on computationally expensive power measurement algorithms, thereby reducing power consumption while maintaining measurement precision.
3Device complexity
If conventional directional antenna schemes are used, then the device complexity is reduced, but the tracking sensitivity and power efficiency worsen
Solution Approach 1:
The patent changes key system parameters including the antenna element spacing, geometric configuration, and signal processing approach. By optimizing these parameters specifically for mm-wave frequencies and mobile device constraints, the system achieves high tracking sensitivity without requiring overly complex antenna structures. The parameter optimization allows the system to maintain simplicity while dramatically improving performance metrics such as angular resolution and tracking 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 approach enables high-resolution angular detection with low power dissipation, providing a more efficient and sensitive mm-wave tracking system for mobile devices.
Implementation Method 1
an injection-locked oscillator having an input coupled to the antenna array to receive reflected beacons, and to lock to the reflected beacon when the reflected beacon has a frequency value within locking range of the oscillator
Implementation Method 2
Millimeter-wave signaling links are gaining in popularity, especially in the wireless context. Corresponding to operating frequencies in the range of around 30 to 300 GHz, transmission and reception of RF signals along the links are often realized through use of directional antennas
Data Source
AI summary
An electronic device for wirelessly tracking the position of a second electronic device is disclosed. The electronic device includes transceiver circuitry having a beacon generator to generate a beacon at a particular frequency and direction. An antenna array transmits the beacon, and receives at least one reflected beacon from the second electronic device. The reflected beacon is received if a position of the second electronic device lies within a range of directions of the beacon. The transceiver circuitry further includes an injection-locked oscillator having an input coupled to the antenna array to receive reflected beacons, and to lock to the reflected beacon when the reflected beacon has a frequency value within locking range of the oscillator. Processing circuitry coupled to the transceiver circuitry tracks the position of the second device based on the lock condition of the oscillator.