Phased Antenna Array Layout for Millimeter Wave Ranging in Wearables
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Solution Overview
Problem
Electronic devices face challenges in supporting millimeter and centimeter wave communications due to substantial attenuation and distortion of signals during propagation, necessitating improved wireless communications circuitry that can effectively handle these high-frequency bands.
Innovation Solution
The integration of phased antenna arrays and non-millimeter wave antennas within conductive housing structures, along with spatial filters and dielectric windows, enables efficient transmission and reception of millimeter and centimeter wave signals, while control circuitry performs spatial ranging operations to detect external objects and issue notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If millimeter wave communications are implemented, then high bandwidth support is achieved, but signal attenuation and distortion increase
Solution Approach 1:
The patent combines multiple antenna elements into a phased array configuration, where multiple signals are merged constructively to achieve beamforming. This increases the effective signal strength and reduces attenuation effects by coherently combining energy from multiple transmit elements, directly addressing the high attenuation problem while maintaining high bandwidth capability
Solution Approach 2:
The patent implements dynamic beam steering capability through phased array technology, allowing the communication system to adaptively adjust beam direction and focus in real-time. This dynamic adjustment optimizes signal propagation paths, compensates for attenuation by concentrating energy in desired directions, and enables the system to maintain high bandwidth performance despite signal loss challenges
2Power
If phased antenna arrays are integrated into conductive housing structures, then signal gain is improved, but device complexity increases
Solution Approach 1:
The patent makes the conductive housing structure serve dual functions: as the mechanical enclosure of the device and as part of the antenna system (acting as ground plane or radiating elements). This eliminates the need for separate antenna housing components, reducing overall device complexity while maintaining the signal gain benefits of the phased array configuration
Solution Approach 2:
The patent merges the antenna elements directly into the conductive housing structure, combining what would traditionally be separate components (antenna elements, housing, ground planes) into an integrated assembly. This integration reduces the number of discrete parts, simplifies assembly, and lowers manufacturing complexity while preserving the phased array's signal gain capabilities
3Reliability
If spatial filters are formed in conductive structures, then millimeter wave transmission is enabled, but manufacturing precision requirements increase
Solution Approach 1:
The patent adjusts the geometric parameters of the spatial filter structures (such as slot dimensions, periodicity, and orientation) to optimize their frequency-selective properties. By carefully controlling these parameters, the filter achieves the required passband characteristics for millimeter wave transmission while keeping manufacturing tolerances within practical limits through parameter optimization rather than requiring extreme precision
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 enhances signal gain and reduces attenuation, allowing for effective millimeter and centimeter wave communications and spatial ranging capabilities, optimizing space within electronic devices like smartwatches.
Implementation Method 1
conveying first radio-frequency signals at a first frequency between 10 GHz and 300 GHz (e.g., millimeter wave signals at a millimeter wave frequency)
Implementation Method 2
a spatial filter such as a frequency selective surface may be formed in the conductive structures of the display module. The spatial filter may have a passband that includes the first frequency
Implementation Method 3
The control circuitry may process the transmitted millimeter wave ranging signals and the reflected version of the transmitted millimeter wave ranging signals received by the phased antenna array to detect a range between the electronic device and the external objects
Implementation Method 4
a dielectric window may be formed in one of the conductive housing sidewalls. In another suitable arrangement, the phased antenna array may be aligned with the dielectric window and may convey the first radio-frequency signals at the first frequency through the dielectric window
Data Source
AI summary
An electronic device such as a wristwatch may be provided with a phased antenna array for conveying first signals at a first frequency between 10 GHz and 300 GHz and a non-millimeter wave antenna for conveying second signals at a second frequency below 10 GHz. The device may include conductive housing sidewalls and a display. Conductive structures in the display and the conductive housing sidewalls may define a slot element in the non-millimeter wave antenna. The phased antenna array may be mounted within the slot element, aligned with a spatial filter in the display, or aligned with a dielectric window in the conductive housing sidewalls. Control circuitry may process signals transmitted by the phased antenna array and a reflected version of the transmitted signals that has been received by the phased antenna array to detect a range between the device and an external object.