Set-Top Box Antenna Mounting With ESD Isolation and Thermal Spacing
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Solution Overview
Problem
Consumer preference for compact electronic devices, such as set top boxes, conflicts with the need for wireless antennae to be oriented for optimal performance, often resulting in reduced performance due to size constraints and electrostatic discharge risks.
Innovation Solution
The design includes two separate antenna assemblies with vertical and horizontal orientations, positioned outside the periphery of the printed circuit board, with a heat management system that uses thermal barriers and heat sinks to maintain performance while minimizing size and electrostatic discharge risks, and strategically located mounting details to create electrostatic discharge isolation pockets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the set top box is made compact to meet consumer preference, then the device size is reduced, but the antenna performance deteriorates due to space constraints and electrostatic discharge risks
Solution Approach 1:
The patent positions antenna assemblies in three-dimensional space outside the circuit board periphery, utilizing vertical and lateral dimensions rather than only horizontal plane placement. This allows optimal antenna orientation and spacing while maintaining a compact overall device footprint, resolving the contradiction between small size and antenna performance.
Solution Approach 2:
The patent introduces non-conductive barriers and isolation structures between the antenna assemblies and the circuit board. These intermediary elements prevent electrostatic discharge from the circuit board to the antennas while maintaining the compact form factor, thus protecting antenna performance without requiring larger spacing.
2Reliability
If the set top box is enlarged to accommodate vertically oriented antennas, then antenna performance is improved, but the device size increases beyond consumer preference
Solution Approach 1:
The patent utilizes the third dimension by positioning antenna assemblies above or below the circuit board plane, and employs various orientations (vertical, horizontal, angled) to achieve optimal antenna performance without increasing the device's external dimensions. This allows high-performance antenna placement within a compact form factor.
Solution Approach 2:
The antenna assemblies are integrated into the device housing structure in a nested arrangement, where antennas are positioned within the overall device envelope but outside the circuit board periphery. This nesting approach allows optimal antenna orientation while maintaining a compact external form factor that meets consumer preferences.
3Volume of moving object
If antennas are positioned close to the circuit board to reduce device size, then device compactness is improved, but electrostatic discharge risk increases
Solution Approach 1:
The patent introduces non-conductive barriers, isolation walls, and protective structures positioned between the circuit board and antenna assemblies. These intermediary elements physically block electrostatic discharge paths while allowing the antennas to be positioned close to the circuit board, thus maintaining compact device size without increasing ESD risk.
Solution Approach 2:
The patent extracts the antenna assemblies from the circuit board area and positions them in separate zones outside the circuit board periphery. This spatial separation removes antennas from the high ESD-risk environment of the circuit board while maintaining overall device compactness through efficient three-dimensional arrangement.
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 allows for optimal antenna performance and reduced size in electronic devices while preventing electrostatic discharge, meeting both aesthetic and functional requirements.
Implementation Method 1
a thermal barrier can be positioned between the circuit board and the antenna assembly
Implementation Method 2
A smart card reader (not shown) can be connected to the circuit board through an aperture in the thermal barrier. The device can further include a bottom heat sink 6a under the circuit board 5.
Data Source
Figure 1
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AI summary
A set top box comprises multiple antennae (15) are positioned outside the periphery of the printed circuit board (5). The antennae can be vertically oriented (15V) or horizontally oriented (15H). The antennae (15) are maintained at least 20 mm from a heatsink (6) and the printed circuit board (5) to prevent electrostatic discharge. The set top box includes vents (14) in the bottom frame (2) outside the periphery of the printed circuit board (5) to promote heat dissipation.