Keyboard Antenna Integration for Wireless Devices
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Solution Overview
Problem
Designing antennas for electronic devices with conductive housings poses challenges due to shielding issues and unsightly external protrusions, while conventional internal antennas are not practical and external antennas are prone to damage.
Innovation Solution
Integrating antenna resonating elements into keyboard keys, which are designed to be away from the conductive housing when not pressed, enhancing transmission and reception efficiency and using a weak spring and flexible communications paths to maintain connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If internal antenna designs are used in electronic devices with conductive housings, then the device maintains a sleek appearance, but the antenna performance is degraded due to shielding by the high-conductivity housing
Solution Approach 1:
The antenna is integrated into the keyboard key structure, utilizing the vertical dimension and the space above the keycap as a new dimension for antenna operation. When the key is not pressed, the antenna element extends upward away from the conductive housing, creating effective separation distance for optimal performance while maintaining the device's sleek external appearance.
Solution Approach 2:
The antenna structure is designed to be dynamic rather than static. The antenna element can change its position relative to the conductive housing based on key press state. When the key is pressed, the antenna moves closer to the housing; when not pressed, it extends away, automatically optimizing its performance based on operational conditions.
2Reliability
If external antenna designs that permanently protrude from device housing are used, then antenna transmission and reception efficiency is improved, but the device appearance becomes unattractive and the antenna is susceptible to damage
Solution Approach 1:
The antenna function is merged with the keyboard key structure. The keycap and its support mechanism serve dual purposes: providing keyboard input functionality and housing the antenna element. This integration eliminates the need for separate protruding external antennas while maintaining aesthetic appearance.
Solution Approach 2:
The keyboard key structure serves multiple functions: it provides mechanical keyboard input, houses the antenna element, and when not pressed, creates the necessary separation distance for optimal antenna performance. This multi-functionality eliminates the trade-off between appearance and antenna efficiency.
3Volume of moving object
If the antenna resonating element is positioned close to the conductive housing, then the device structure is compact, but the antenna transmission and reception efficiency is degraded
Solution Approach 1:
The antenna structure utilizes the dynamic motion of the keyboard key to achieve optimal separation distance. When the key is not pressed, the antenna element extends upward, creating maximum separation from the conductive housing for optimal performance. The structure remains compact when the key is in its resting position, and only extends when needed for communication.
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 solution provides improved wireless communications efficiency and aesthetics by utilizing keyboard keys as antennas, maintaining performance even with conductive housings and reducing damage risks.
Implementation Method 1
An antenna resonating element may be formed from a flex circuit containing a strip of conductor, a piece of stamped metal foil, a length of wire, etc.
Implementation Method 2
The antenna resonating element may be coupled to the transceiver through a weak spring that flexes as the key is pressed by a user.
Data Source
AI summary
Key antennas are provided for an electronic device such as a laptop computer. The electronic device may have radio-frequency transceivers that transmit and receive signals using the key antennas. An antenna resonating element may be mounted beneath a keycap of each key antenna. The antenna resonating element may be spirally wrapped and integrated into the keycap. The key antenna may function as an antenna and may also function as an input key for an electronic device. A flexible communications path may pass through a hole in a conductive housing of the electronic device and may be used to couple the antenna resonating element to the radio-frequency transceiver. The antenna resonating element may be coupled to the radio-frequency transceiver by a weak spring. The weak spring may form a portion of the antenna resonating element.