Slot Antenna Resonating Element for Handheld Wireless Devices
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Solution Overview
Problem
Designing a compact antenna for handheld electronic devices that covers a wide range of frequencies while maintaining efficiency and immunity to proximity effects is challenging, as modern devices need to function across multiple communications bands.
Innovation Solution
The use of a slot antenna resonating element with multiple openings and a near-field-coupled antenna resonating element, electromagnetically coupled to the slot antenna, allows for resonance at multiple frequencies, broadening bandwidth and providing coverage for distinct communications bands, and is less susceptible to user hand position influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a compact antenna is designed to cover wide frequency bands, then frequency coverage is improved, but antenna efficiency deteriorates
Solution Approach 1:
The antenna is divided into two separate resonating elements: a slot antenna resonating element and a near-field-coupled antenna resonating element. Each element is optimized for specific frequency ranges, with the slot element covering lower frequencies and the near-field-coupled element covering higher frequencies. This segmentation allows each element to maintain high efficiency in its designated frequency range while collectively providing wideband coverage.
Solution Approach 2:
The slot antenna resonating element acts as an intermediary that is directly fed by the transmission line and electromagnetically couples energy to the near-field-coupled antenna resonating element. This intermediary structure enables efficient energy transfer across the frequency spectrum, with the directly-fed slot element ensuring efficient lower band operation while coupling energy to the indirectly-fed element for upper band coverage.
2Volume of moving object
If antenna size is reduced to meet small form factor requirements, then device compactness is improved, but bandwidth coverage deteriorates
Solution Approach 1:
The two resonating elements are nested within the same compact antenna structure, with the slot antenna resonating element and near-field-coupled antenna resonating element occupying overlapping spatial regions. This nesting allows the antenna to provide wide bandwidth coverage equivalent to larger separate antennas while maintaining a compact form factor suitable for handheld devices.
Solution Approach 2:
The patent utilizes electromagnetic near-field coupling in the third dimension (vertical spacing between elements) to achieve frequency multiplication and bandwidth expansion without increasing the planar footprint. By controlling the vertical distance and electromagnetic coupling between the slot element and near-field-coupled element, the antenna achieves extended bandwidth coverage while maintaining a compact planar structure.
3Device complexity
If a single antenna element is used to cover multiple bands, then device complexity is reduced, but immunity to proximity effects deteriorates
Solution Approach 1:
The antenna system is segmented into two independently designed resonating elements with different geometric configurations and feeding mechanisms. The slot antenna resonating element provides a first set of resonant frequencies while the near-field-coupled antenna resonating element provides a second set of resonant frequencies. This segmentation creates multiple electromagnetic patterns that are less susceptible to degradation from user hand proximity, as the diverse resonant modes maintain more stable performance across different holding positions.
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 enhances the antenna's performance by allowing it to cover multiple frequency bands with improved immunity to proximity effects, ensuring robust wireless communication in handheld devices.
Implementation Method 1
Another antenna resonating element may be electromagnetically coupled to the slot antenna resonating element through electromagnetic near-field coupling
Data Source
AI summary
A handheld electronic device is provided that contains wireless communications circuitry. The wireless communications circuitry may include antennas. An antenna in the handheld electronic device may have a ground plane element. A slot antenna resonating element may be formed from an opening in the ground plane element. A near-field-coupled antenna resonating element may be electromagnetically coupled to the slot antenna resonating element through electromagnetic near-field coupling. A transmission line may directly feed the slot antenna resonating element. The transmission line may indirectly feed the near-field-coupled antenna resonating element through the slot antenna resonating element. The slot antenna resonating element may have one or more associated resonant frequencies and the near-field-coupled antenna resonating element may have one or more associated resonant frequencies. The antenna may be configured to cover one or more distinct communications bands.