Capacitively Fed Display Antenna for Multi-Band Wireless Integration
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Solution Overview
Problem
Electronic devices with wireless communications capabilities face challenges in integrating compact antennas that cover multiple frequency bands without interfering with display components, while maintaining a small form factor and optimal display area.
Innovation Solution
The integration of a capacitively fed antenna within the display, utilizing a conductive layer of the display as an antenna resonating element and indirect feeding via capacitive coupling across a dielectric layer, allowing for efficient radio-frequency signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional antenna is integrated into the electronic device, then wireless communication capability is achieved, but the display area is reduced and antenna interference with display components occurs
Solution Approach 1:
The patent merges the antenna structure with the display structure by using the conductive layer of the display as the antenna resonating element. The feed patch is integrated into the display's conductive layers, and the antenna components are formed within the display's existing layers (TFT layer, dielectric layers), eliminating the need for separate antenna space and maximizing display area.
Solution Approach 2:
The antenna structure is nested within the display structure. The resonating element is formed using the conductive layer of the display, and the feed network is integrated into the display's internal layers. The antenna components are embedded within the display's multi-layer construction, allowing the antenna to occupy no additional space beyond the display boundaries.
2Volume of moving object
If antenna components are placed close to the display, then compact form factor is achieved, but antenna interference with display components occurs
Solution Approach 1:
The patent uses dielectric layers as intermediaries between the feed patch and the resonating element, and between different antenna components. The dielectric layers provide electrical isolation while maintaining capacitive coupling for signal transmission, preventing direct interference between antenna components and display components while enabling compact integration.
Solution Approach 2:
The patent replaces direct electrical connections with capacitive coupling through dielectric layers. Instead of using traditional direct-wired antenna feeds that would require physical space and create interference risks, the design uses electric field coupling through dielectric materials, reducing physical interference while maintaining electrical functionality.
3Device complexity
If the antenna uses direct feeding method, then simple structure is achieved, but larger space is required and display area is reduced
Solution Approach 1:
The feed patch couples to the resonating element through capacitive coupling via dielectric layers rather than direct electrical connection. This intermediary approach allows the antenna to be fed without requiring additional space for direct connections, as the coupling is achieved through the existing dielectric structure of the display.
Solution Approach 2:
The display's existing dielectric layers are utilized to provide the capacitive coupling function for antenna feeding. The same dielectric materials that are part of the display structure serve dual purposes: as insulating layers for the display and as coupling media for the antenna feed, eliminating the need for separate feeding structures.
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 efficient wireless communication across multiple frequency bands with minimal space usage, maximizing the display area by integrating the antenna within the display structure.
Implementation Method 1
The feed patch may indirectly feed the antenna resonating element arm via a first capacitive coupling across the dielectric layer
Implementation Method 2
The additional conductive layer may convey radio-frequency current between the antenna resonating element arm and the conductive wall via a second capacitive coupling across the dielectric layer
Data Source
AI summary
An electronic device may be provided with sidewalls, a rear wall, and a display mounted to the sidewalls opposite the rear wall. The device may include an antenna integrated into the display. The antenna may include a resonating arm formed from a first conductive layer in the display. The first conductive layer may be layered onto a dielectric layer of the display. The antenna may be fed using a feed patch layered onto the dielectric layer. The feed patch may indirectly feed the first conductive layer via a first capacitive coupling across the dielectric layer. The antenna may have a return path that includes a second conductive layer on the dielectric layer. The second conductive layer may convey radio-frequency current between the first conductive layer and the rear wall via a second capacitive coupling across the dielectric layer.