Distributed Loop Antenna Subloops for Bandwidth and Detuning
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Solution Overview
Problem
The challenge in electronic devices is to effectively mount antennas without detuning or reducing efficiency, as the relative position and size of antennas with surrounding structures can impact antenna tuning and bandwidth.
Innovation Solution
The use of a dielectric carrier with elongated shape extending parallel to the device's edge, featuring first and second loop antenna resonating elements, where the second loop is a distributed element formed from multiple subloops, and metal segments create inductance to manage antenna currents and improve performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional single-loop antenna is used, then the antenna structure is simple, but the bandwidth is narrow and the antenna may become detuned
Solution Approach 1:
The single loop antenna is divided into multiple subloops (first subloop, second subloop, third subloop) that are coupled together. Each subloop can be independently tuned, allowing the overall antenna to maintain stable resonance across a broader frequency range while preventing detuning effects that would occur in a traditional single-loop design.
Solution Approach 2:
Multiple subloops are combined into a single antenna structure with shared components (such as common feed points or coupled resonators). This merging allows the antenna to achieve broader bandwidth and improved tuning stability by leveraging the collective resonance characteristics of all subloops while maintaining a unified structural form.
2Area of stationary object
If the antenna size and shape are adjusted to fit device constraints, then the antenna can be mounted within the electronic device, but the bandwidth and efficiency are reduced
Solution Approach 1:
The multiple subloops are arranged in a nested or compact configuration where smaller loops are positioned within or adjacent to larger loops. This nesting allows the antenna to achieve the electrical performance of a larger antenna while fitting within the constrained physical space of the electronic device, thereby maintaining efficiency bandwidth without requiring excessive mounting area.
Solution Approach 2:
The antenna structure utilizes three-dimensional spatial arrangement of subloops rather than simple planar expansion. By stacking or positioning loops in different spatial dimensions, the antenna achieves broader bandwidth and maintained efficiency within a compact volume, effectively trading spatial arrangement for performance rather than relying on increased physical footprint.
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 antenna performance by broadening bandwidth and maintaining efficiency across desired operating frequencies, preventing detuning and ensuring effective wireless signal transmission and reception.
Implementation Method 1
Openings in the metal may form metal segments that collectively form an inductance for the first subloop. Inductances formed from parallel metal segments may also be formed in other subloops.
Implementation Method 2
The antenna structures may be formed using a dielectric carrier structure. The dielectric carrier may have an elongated shape that extends along a longitudinal axis.
Implementation Method 3
The antenna structures may have first and second loop antenna resonating elements. The first loop antenna resonating element may indirectly feed the second loop antenna resonating element.
Data Source
AI summary
An electronic device may be provided with antenna structures. The antenna structures may be formed using a dielectric carrier structure. The antenna structures may have first and second loop antenna resonating elements. The first loop antenna resonating element may indirectly feed the second loop antenna resonating element. The second loop antenna resonating element may be a distributed loop element formed from multiple antenna resonating element subloops. The second loop antenna resonating element may be formed from a strip of metal with a width that loops around the dielectric carrier. An opening in the metal may separate first and second subloop antenna resonating elements from each other in the second loop antenna resonating element. Openings in the metal may form metal segments that collectively form an inductance for the first subloop. Antenna currents may flow through metal traces on the carrier and portions of an electronic device housing wall.