Shared Antenna Structures with Split Return Paths
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Solution Overview
Problem
Electronic devices face challenges in forming antenna structures that are both compact and robust, as they can be sensitive to their position relative to external objects, leading to detuning and inconsistent wireless signal performance.
Innovation Solution
The electronic device incorporates multiple antennas with shared structures at opposing ends, featuring an inverted-F antenna resonating element and a split return path with adjustable inductors, which allows for efficient radio-frequency signal transmission across various frequency bands, including a wireless local area network and ultra-high band, while minimizing space and optimizing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antennas are made compact, then device size is reduced, but antenna performance becomes sensitive to position relative to external objects
Solution Approach 1:
The antenna structure is divided into multiple segments including a resonating element, ground structure, feed structure, and return path with adjustable inductors. This segmentation allows independent optimization of each component and enables reconfiguration to maintain performance across different positions and frequency bands.
Solution Approach 2:
The antenna incorporates adjustable inductors in the return path that can be dynamically reconfigured to change the electrical characteristics of the antenna. This dynamic adjustment capability allows the antenna to maintain optimal performance when positioned near different external objects or when operating across multiple frequency bands.
2Adaptability or versatility
If antennas are designed for multiple frequency bands, then communication versatility is improved, but antenna structure complexity increases
Solution Approach 1:
The antenna structure is designed to serve multiple frequency bands (e.g., 700 MHz, 1700 MHz, 2100 MHz, and 5 GHz) using a single integrated design. The resonating element, ground structure, and adjustable inductors work together to provide universal coverage across different bands, eliminating the need for separate antennas for each frequency.
Solution Approach 2:
The antenna uses adjustable inductors that can change the electrical parameters of the return path to resonate at different frequencies. By adjusting the inductance values, the same physical structure can be tuned to operate efficiently across multiple frequency bands without requiring multiple separate antenna elements.
3Volume of moving object
If shared antenna structures are used, then device space is optimized, but signal performance may be compromised
Solution Approach 1:
Multiple antennas share common structural elements including the resonating element, ground structure, and feed structure. This merging of components reduces the overall space required in the device while maintaining the electrical isolation and performance characteristics needed for reliable wireless communication across different frequency bands.
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 efficiency and adaptability, ensuring reliable wireless communications across multiple frequency bands with improved robustness against external object interference, thereby addressing the challenges of compactness and sensitivity in existing antenna designs.
Implementation Method 1
An antenna with an inverted-F antenna resonating element formed from portions of a peripheral conductive electronic device housing structure may have an antenna ground that is separated from the antenna resonating element by a gap
Implementation Method 2
The additional antenna may convey radio-frequency signals in a second frequency band that is different from the first frequency band
Implementation Method 3
The antenna resonating element arm of the additional antenna may parasitically coupled to the inverted-F antenna resonating element or the first inductor of the split return path at frequencies in a third frequency band that is different from the first and second frequency bands
Data Source
AI summary
Antenna structures at a given end of an electronic device may include antenna structures that are shared between multiple antennas. The device may include an antenna with an inverted-F antenna resonating element formed from portions of a peripheral conductive electronic device housing structure and may have an antenna ground that is separated from the antenna resonating element by a gap. A short circuit path may bridge the gap. The short circuit path may be a split return path coupled between a first point on the inverted-F antenna resonating element arm and second and third points on the antenna ground. The electronic device may include an additional antenna that includes the antenna ground and metal traces that form an antenna resonating element arm. The antenna resonating element arm of the additional antenna may be parasitically coupled to the inverted-F antenna resonating element and a portion of the split return path.