Tunable Antenna Design for Compact Devices with RF Optimization
Here’s PatSnap Eureka !
Summary
Problems
The challenge is to design wireless communications circuitry for electronic devices that incorporates compact antenna structures within conductive device housings while maintaining satisfactory radio-frequency performance across a range of operating frequencies, as conductive structures can affect RF performance and require careful integration.
Innovation solutions
The solution involves a dual arm inverted-F antenna structure formed from peripheral conductive housing elements, with a short circuit path bridging a gap between the antenna resonating element and ground, and adjustable inductor and capacitor circuitry for tuning across different frequency bands, allowing for flexible antenna configuration and performance optimization.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If conductive structures are used in device housing, then structural strength and aesthetic appearance are improved, but radio-frequency performance deteriorates
Why choose this principle:
The antenna structure is segmented into multiple conductive elements (first conductive element, second conductive element, third conductive element) that are electrically connected through a feed structure. This segmentation allows each element to be optimized for specific frequency ranges while maintaining overall RF performance despite the presence of conductive housing structures.
Principle concept:
If conductive structures are used in device housing, then structural strength and aesthetic appearance are improved, but radio-frequency performance deteriorates
Why choose this principle:
A feed structure acts as an intermediary between the conductive housing elements and the ground plane, providing controlled electrical connection while isolating the antenna elements from direct interference with the conductive housing. This intermediary structure enables the antenna to function effectively within the conductive enclosure.
Application Domain
Data Source
AI summary:
The solution involves a dual arm inverted-F antenna structure formed from peripheral conductive housing elements, with a short circuit path bridging a gap between the antenna resonating element and ground, and adjustable inductor and capacitor circuitry for tuning across different frequency bands, allowing for flexible antenna configuration and performance optimization.
Abstract
Electronic devices may be provided that contain wireless communications circuitry. The wireless communications circuitry may include radio-frequency transceiver circuitry and antenna structures. The antenna structures may form a dual arm inverted-F antenna. The antenna may have a resonating element formed from portions of a peripheral conductive electronic device housing member 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. An antenna feed may be coupled across the gap in parallel with the short circuit path. Low band tuning may be provided using an adjustable inductor that bridges the gap. The antenna may have a slot-based parasitic antenna resonating element with a slot formed between portions of the peripheral conductive electronic device housing member and the antenna ground. An adjustable capacitor may bridge the slot to provide high band tuning.