Touch Interface Antenna Layout for Detune-Resilient Wireless Devices
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Solution Overview
Problem
Compact wireless devices face sub-optimal performance due to undesirable electrical coupling between components, leading to decreased radiated efficiency and resilience to detuning, particularly caused by close proximity of antenna and power source, and unpredictable interactions with touch-sensitive components.
Innovation Solution
Incorporating a spacer to maintain predictable and fixed locations and orientations of components, using an impedance network to isolate the power source, and configuring the touch sensor as a grounded plane to reduce detuning and enhance antenna performance by increasing separation distances and optimizing component placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If components are placed close together in a compact wireless device, then device size is reduced, but electrical coupling between components increases causing decreased radiated efficiency
Solution Approach 1:
The patent introduces a spacer as an intermediary component positioned between the antenna and power source. This spacer creates physical separation and reduces electrical coupling while maintaining the compact overall device form factor, thereby preserving radiated efficiency without increasing device volume.
Solution Approach 2:
The patent segments the internal components (antenna, power source, touch sensor) into distinct spatial zones using spacers and strategic placement. This segmentation prevents unwanted electrical interactions between components while maintaining compact dimensions, resolving the contradiction between small size and high radiated efficiency.
2Measurement precision
If antenna bandwidth is narrowed to improve selectivity, then frequency selectivity is improved, but resilience to detuning from user interactions decreases
Solution Approach 1:
The patent modifies the antenna's physical parameters (dimensions, shape, configuration) to achieve a broader bandwidth while maintaining frequency selectivity. This allows the antenna to tolerate detuning effects from user interactions with touch sensors, improving reliability without sacrificing frequency discrimination capability.
3Ease of manufacture
If manufacturing tolerances are widened to reduce production costs, then ease of manufacture is improved, but device-to-device variance in antenna performance increases
Solution Approach 1:
The spacer acts as a mechanical intermediary that defines precise separation distances between components. By using a spacer with controlled dimensions, the patent ensures consistent antenna-to-power-source and antenna-to-touch-sensor spacing across all devices, reducing device-to-device variance even when other components have wider manufacturing tolerances.
4Volume of moving object
If touch sensor is placed close to antenna to save space, then device compactness is improved, but unpredictable electrical coupling occurs during user interaction
Solution Approach 1:
The patent positions a spacer between the touch sensor and antenna, creating a controlled intermediate zone. This spacer maintains a predictable minimum separation distance that prevents unpredictable electrical coupling during user interactions while allowing the device to remain compact overall.
Data Source
AI summary
Systems, apparatuses, and methods are described for increasing a performance of a small wireless device comprising one or more conductive elements electrically coupled with an antenna. A user interface element of the wireless device may be configured to operate as a radiative component of an antenna structure. A power source element may be electrically isolated from a ground, resulting in decreased coupling with the antenna. Moreover, an antenna bandwidth may be increased, via modification of one or more antenna characteristics and/or the addition of one or more novel antenna components, in order to increase the detune-resiliency of the antenna. In addition, the radio frequency performance and reliability of the wireless device may be improved by maintaining fixed positioning between various components of the wireless device. Thus, the antenna and the one or more conductive elements may be configured to increase the device performance.