Sidewall Antenna Package Layout for RF Isolation
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Solution Overview
Problem
Existing electronic devices with integrated antennas and circuitry face performance degradation due to electromagnetic signal interference, necessitating improved RF isolation and interference reduction.
Innovation Solution
The integration of directional antennas on opposed package sidewalls with vertically-oriented grounded shields and horizontally-oriented ground planes to direct radiation patterns away from the device and shield electromagnetic interference, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If antennas and circuitry are integrated within the same device package, then device compactness and integration are improved, but electromagnetic signal interference between antennas and circuitry increases
Solution Approach 1:
The device package is segmented into distinct functional zones: antenna regions on opposite sidewalls and circuitry regions on the top and bottom surfaces. This spatial segmentation allows both antennas and circuitry to coexist in the same package while minimizing electromagnetic interference through physical separation and strategic positioning.
Solution Approach 2:
The invention moves antennas from the traditional planar arrangement to three-dimensional sidewall positioning. By placing antennas on vertical sidewalls rather than horizontal surfaces, the radiation patterns are directed away from the circuitry, reducing interference while maintaining compact integration.
2Reliability
If directional antennas are placed on opposed package sidewalls, then radiation patterns are directed away from the device improving RF isolation, but device structure and antenna configuration complexity increase
Solution Approach 1:
The invention employs asymmetric antenna configuration where antennas are placed on specific sidewalls (first and third sidewalls) rather than all sidewalls. This asymmetric positioning optimizes RF isolation by directing radiation patterns away from each other while simplifying the overall structure compared to a fully symmetric multi-antenna arrangement.
Solution Approach 2:
The encapsulant material serving as the package substrate acts as an intermediary between the antennas and the external environment. It provides mechanical support, electrical insulation, and influences the radiation patterns, thereby simplifying the antenna structure while achieving the desired RF isolation performance.
3Object-affected harmful factors
If vertically-oriented grounded shields are added between antennas and circuitry, then electromagnetic interference shielding is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The grounded shields are merged with the encapsulant material that forms the package substrate. Rather than being separate components, the shields are integrated into the encapsulation process, reducing the number of discrete parts and simplifying manufacturing while maintaining effective electromagnetic shielding.
Solution Approach 2:
The encapsulant material serves multiple functions: it provides mechanical encapsulation, electrical insulation, structural support, and electromagnetic shielding through the integrated grounded shields. This multi-functionality reduces the need for additional dedicated shielding components, simplifying the overall device structure.
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 significantly reduces electromagnetic interference between antennas, enhancing the performance and functionality of the electronic circuit by isolating RF signals and preventing interference within the device package.
Implementation Method 1
a shield structure embedded within the encapsulant material between the sidewall antenna and the electronic circuit
Implementation Method 2
a ground plane at or below the mounting surface of the device substrate to act as an antenna back stop
Data Source
Figure 1~2
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Figure 5~7
AI summary
An electronic device includes a device substrate with a mounting surface, an electronic circuit coupled to the mounting surface, and encapsulant material over the electronic circuit and the mounting surface. The encapsulant material has an upper encapsulant surface and a plurality of encapsulant sidewalls extending between the mounting surface of the device substrate and the upper encapsulant surface. The electronic device also includes a sidewall antenna coupled to one of the encapsulant sidewalls, and a shield structure embedded within the encapsulant material between the sidewall antenna and the electronic circuit. The sidewall antenna is electrically coupled to the electronic circuit through the device substrate. The shield structure extends from the mounting surface of the device substrate toward the upper surface of the encapsulant material. The sidewall antenna may be selected from an end-fire type of antenna and a broadside-fire type of antenna.