Corner-Coupled Antenna Assembly for Compact Wireless Devices
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Solution Overview
Problem
Designing antennas for mobile wireless communications devices that provide desired operating characteristics within the limited space available is a challenge, as devices become smaller and more functional, requiring compact yet efficient antenna solutions.
Innovation Solution
A mobile wireless communications device with an antenna assembly featuring electrically conductive base conductors and L-shaped arms, positioned diagonally and spaced apart, which provides increased bandwidth and resonance, allowing for omni-directional radiation patterns and efficient communication across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the size of mobile wireless communications devices is reduced to make them more portable and convenient, then device portability is improved, but the available space for antennas is reduced
Solution Approach 1:
The antenna assembly utilizes a three-dimensional configuration with vertical stacking of conductor elements and diagonal corner coupling between rectangular base portions. This vertical and diagonal arrangement allows the antenna to achieve full-wave resonance lengths in the vertical dimension while maintaining a compact horizontal footprint, effectively transitioning from a two-dimensional planar layout to a three-dimensional spatial structure that accommodates limited device space.
Solution Approach 2:
The antenna assembly employs a nested structure where L-shaped conductor arms are positioned within and around the rectangular base portions, with conductors nested within the boundaries defined by the base geometry. This nesting approach maximizes the use of available space by arranging conductor elements in a hierarchical, space-efficient manner that fits within the constrained antenna area of compact devices.
2Area of stationary object
If compact antenna designs are used to fit limited space, then device size is reduced, but antenna performance and operating characteristics may deteriorate
Solution Approach 1:
The antenna assembly employs asymmetric corner coupling where diagonally opposing corners of rectangular base portions are connected, creating an asymmetric current distribution pattern. The L-shaped arms are positioned asymmetrically relative to the rectangular bases, with arms extending from specific corners at defined spacings. This asymmetric geometry creates multiple resonant modes and improves bandwidth while maintaining compact dimensions, preventing performance deterioration despite reduced antenna size.
Solution Approach 2:
The antenna assembly divides the radiating structure into segmented components: rectangular base portions and separate L-shaped conductor arms. These segmented elements are spaced apart at defined distances and coupled through diagonal corner connections. The segmentation allows each element to contribute to different resonant frequencies and radiation patterns, improving overall antenna performance and bandwidth while maintaining a compact total structure that fits limited device space.
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 antenna assembly achieves nearly constant gain and increased radiation efficiency across a large bandwidth, including the WiMax band, while maintaining a compact size, suitable for small form factor devices and multiple-input and multiple-output (MIMO) systems.
Implementation Method 1
The antenna assembly achieves nearly constant gain and increased radiation efficiency across a large bandwidth, including the WiMax band, while maintaining a compact size
Data Source
AI summary
A mobile wireless communications device may include a portable housing, a substrate carried by the portable housing, and wireless communications circuitry carried by the substrate. The mobile wireless communications device may also include at least one an antenna assembly carried by the substrate and coupled to the wireless communications circuitry. The at least one antenna assembly may include an electrically conductive base conductor having a first rectangular base portion and a second rectangular base portion offset therefrom. The first and second base portions may be coupled at respective diagonally opposing corners thereof and having an antenna feed defined along an outer portion of one of the first and second rectangular base portions. The at least one antenna assembly may include at least one electrically conductive arm extending along at least one side of one of the first and second rectangular base portions and spaced apart therefrom.