Display Antenna Ground Isolation for Multi-Band Signal Reception
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Solution Overview
Problem
Existing wireless electronic devices face challenges in integrating compact wireless communications circuitry that effectively covers multiple communications bands without interference, while maintaining satisfactory performance across a range of operating frequencies.
Innovation Solution
The solution involves a metal housing with a display cover layer and electrical component layers, where a system-in-package device with a flexible printed circuit forms part of the antenna, and a mounting scheme with brackets that create a capacitance between the system-in-package ground plane and the metal housing, while other brackets provide a direct grounding path, enhancing antenna performance by controlling capacitance and grounding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If antennas are integrated into compact electronic devices to cover multiple communications bands, then device functionality and coverage are improved, but antenna interference and performance degradation occur
Solution Approach 1:
The antenna system is segmented into multiple independent antenna elements, each optimized for specific frequency bands. The grounding system is also segmented into multiple grounding pads with different configurations, allowing each antenna element to operate with its own optimized ground reference, thereby reducing mutual interference between antennas while maintaining compact form factor
Solution Approach 2:
Different regions of the antenna structure are assigned different local properties - some areas use continuous ground planes while others use discontinuous or patterned ground structures. The grounding pads are strategically positioned with varying sizes and shapes to create localized electromagnetic environments optimized for specific antenna elements and frequency bands, reducing overall interference
2Reliability
If ground planes are directly connected to metal housing for grounding, then grounding effectiveness is improved, but antenna performance in satellite navigation bands deteriorates
Solution Approach 1:
The grounding connection parameters are changed by introducing controlled capacitance values between the ground plane and metal housing. Instead of a direct rigid connection, capacitive coupling with specific capacitance values (e.g., 1-10 pF) is used, which maintains DC grounding while allowing RF signals in satellite navigation bands to pass through with minimal interference, thus optimizing antenna performance
3Stability of the object's composition
If mounting brackets directly connect system-in-package ground plane to metal housing, then structural stability is improved, but antenna capacitance and performance are degraded
Solution Approach 1:
Capacitive elements are introduced as intermediary components between the mounting brackets and the ground plane connection. These intermediaries maintain the structural mounting function while providing the necessary electrical capacitance for antenna operation in satellite navigation bands, effectively decoupling the structural and electrical functions
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 improves antenna performance across various bands, including satellite navigation systems, by managing capacitance and grounding, thereby reducing interference and ensuring effective wireless communications.
Implementation Method 1
These arrangements may create a capacitance between the ground plane in the system-in-package device and the metal housing at one of the mounting brackets
Implementation Method 2
a tank circuit may be interposed between a grounding solder pad in the system-in-package device and the system-in-package ground plane
Data Source
AI summary
An electronic device may have a display cover layer mounted to a metal housing. Electrical component layers such as a display layer, touch sensor layer, and near-field communications antenna layer may be mounted under the display cover layer. An antenna feed may have a positive feed terminal coupled to the electrical component layers and a ground feed terminal coupled to the metal housing. The electrical component layers may serve as an antenna resonating element for an antenna. The antenna may cover cellular telephone bands and may receive satellite navigation system signals. A system-in-package device may be mounted to the metal housing. A flexible printed circuit may extend between the electrical component layers and the system-in-package device. A mounting bracket for the system-in-package device may be provided with electrical isolation to enhance antenna performance in bands such as a satellite navigation system band.