Nested Antenna Layout for Dual-Band Coverage in Compact Devices
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Solution Overview
Problem
Existing antenna devices struggle to cover a wider frequency band while maintaining a compact size, particularly in wireless communication technologies like Wi-Fi, where extending the applicable frequency range requires additional elements and increased size.
Innovation Solution
The antenna device incorporates a feed antenna for a first frequency, a loop antenna for a second lower frequency surrounding the feed antenna, and a resonator outside the loop antenna, with extending portions to adjust impedance and reduce size without altering element lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional antenna elements are added to extend frequency coverage, then the applicable frequency band is improved, but the antenna size increases
Solution Approach 1:
The loop antenna is configured to surround the feed antenna, creating a nested structure where the lower frequency antenna encloses the higher frequency antenna. This nesting allows multiple frequency bands to be covered within a compact overall structure, resolving the contradiction between frequency coverage and size.
Solution Approach 2:
The extending portions of the loop antenna protrude outward in a direction perpendicular to the feed antenna extension, utilizing spatial arrangement in multiple dimensions. This dimensional arrangement allows impedance adjustment and frequency optimization without increasing the overall antenna footprint.
2Reliability
If element lengths are altered to optimize impedance, then the impedance matching is improved, but the resonant frequency characteristics deteriorate
Solution Approach 1:
The loop antenna is divided into multiple sections including extending portions that can be independently adjusted. These extending portions allow impedance optimization without changing the overall resonant frequency-determining dimensions, thus resolving the contradiction between impedance matching and frequency characteristics.
Solution Approach 2:
The extending portions are specifically designed to provide local impedance adjustment capability. By modifying only these local extending sections rather than the entire antenna structure, the patent achieves impedance optimization while preserving the global resonant frequency characteristics.
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
The design allows the antenna to cover multiple frequency bands (2.4 GHz and 5 GHz) while reducing size and improving gain, suitable for various communication devices.
Implementation Method 1
the loop antenna corresponding to a second frequency lower than the first frequency; and a resonator arranged outside the loop antenna in a direction in which the feed antenna extends, the resonator corresponding to the second frequency
Data Source
AI summary
There are provided an antenna device and a communication device including: a feed antenna connected to a feed point and extending from the feed point, the feed antenna corresponding to a first frequency; a loop antenna connected to a ground and arranged to surround the feed antenna, the loop antenna corresponding to a second frequency lower than the first frequency; and a resonator arranged outside the loop antenna in a direction in which the feed antenna extends, the resonator corresponding to the second frequency. The loop antenna includes an extending portion that extends to protrude outward on a side where the resonator is arranged with respect to the feed point.