Embedded Antenna in Control Knob for Compact Communication Devices
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Solution Overview
Problem
Communication devices with embedded antennas face performance degradation and susceptibility to EMI due to non-metallic chassis requirements, limiting their use in high-performance applications, and there is a demand for smaller form factors with less intrusive antennas.
Innovation Solution
Embedding a secondary antenna within a control knob on the top panel of a communication device, mechanically supported by a printed circuit board, allowing the control knob to move freely and maintain a watertight seal, while enabling radial and vertical movement to actuate switches without contacting the antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antennas are embedded inside the chassis to reduce form factor, then the device becomes smaller and less obtrusive, but antenna performance degrades and susceptibility to EMI increases
Solution Approach 1:
The patent embeds the antenna inside the control knob housing, nesting it within an existing structural component. The antenna is positioned in a cavity formed by the control knob housing, which is itself integrated into the device chassis. This nesting approach allows the antenna to be concealed within the device footprint without requiring separate external mounting space, thereby reducing overall form factor while maintaining antenna functionality through proper positioning and isolation within the control knob structure.
2Volume of moving object
If antennas are embedded inside the chassis, then the form factor is improved, but the chassis must be made of non-metallic material which compromises EMI shielding and structural ruggedness
Solution Approach 1:
The antenna is nested within the control knob housing structure, which provides a dedicated cavity and physical isolation. This nested configuration allows the use of metallic control knob housing that can provide EMI shielding for the antenna, while the overall device chassis can maintain its structural integrity with metallic materials. The control knob housing acts as an intermediate shielded enclosure, protecting the antenna from external EMI without requiring the entire chassis to be non-metallic.
Solution Approach 2:
The control knob housing serves as an intermediary structure between the antenna and the external environment. It provides a shielded cavity that isolates the antenna from EMI while allowing the antenna to maintain its embedding within the device footprint. The control knob housing material and structure act as a mediator that protects the sensitive antenna element without compromising the overall device design or requiring non-metallic chassis construction.
3Reliability
If components are disposed on the top panel to maintain accessibility and antenna positioning, then antenna performance is maintained, but the device becomes larger and more obtrusive
Solution Approach 1:
The patent combines the antenna function with the control knob structure by integrating the antenna into the control knob housing. This merging of functions allows the antenna to be positioned on the top panel (maintaining accessibility and performance) while being concealed within the control knob volume, thereby reducing the overall device form factor and making it less obtrusive without sacrificing antenna functionality.
Solution Approach 2:
The antenna is nested within the control knob housing on the top panel, allowing it to occupy space within the control knob structure rather than requiring separate external mounting space. This nesting enables the antenna to maintain its top panel positioning for optimal performance and accessibility while being concealed within the device footprint, reducing the overall volume and obtrusiveness of the device.
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 frees up space on the top panel, reducing the device's form factor and enabling additional external controls, while maintaining antenna performance and structural integrity, thus addressing the need for smaller, high-performance communication devices.
Implementation Method 1
A resilient member may be provided for returning the control knob to a rest position after being depressed
Implementation Method 2
A watertight seal may be provided between the control knob and the housing
Data Source
AI summary
Systems (300) and methods (900) for packaging an antenna (702) in a communication device (300). The methods involve coupling the antenna to a Printed Circuit Board (“PCB”) such that the antenna is mechanically supported thereby. A hollow shaft (510) of a control knob (304) is positioned over the antenna and at least a portion of PCB (706) such that the antenna is embedded within the control knob. Thereafter, the control knob is mechanically secured to a housing (308) of the communication device. The control knob is arranged such that it can move in a radial direction and a vertical direction (516) relative to the chassis. The control knob is also arranged such that the hollow shaft is able to move freely over the antenna without coming in contact therewith.