Switchable Reflector Antenna for Dual-Band WLAN Null Elimination
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Solution Overview
Problem
Conventional mobile device antennas have fixed radiation patterns with nulls, which degrade communication quality in specific directions, necessitating a novel solution to enhance performance across various frequency bands.
Innovation Solution
A communication device incorporating a ground element, an antenna structure, and two reflectors with a switch element that allows dynamic adjustment of the reflectors' lengths to modify the radiation pattern, eliminating nulls and optimizing performance across dual frequency bands (2400 MHz to 2500 MHz and 5150 MHz to 5850 MHz).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fixed antenna structure is used, then the device structure is simple, but the radiation pattern has fixed nulls that degrade communication quality in specific directions
Solution Approach 1:
The patent applies the dynamics principle by making the reflector elements adjustable in length through switching elements. The reflectors can be dynamically reconfigured between different length states (enabled/disabled) to adapt the radiation pattern to different communication scenarios, eliminating fixed nulls while maintaining structural simplicity when not in use.
Solution Approach 2:
The patent implements parameter changes by modifying the electrical length of the reflector elements through the switching elements. By changing the effective length parameter of the reflectors, the radiation pattern characteristics are altered to eliminate nulls in specific directions, thereby improving communication quality without requiring a completely different antenna structure.
2Adaptability or versatility
If dual-band antenna operation is implemented, then frequency versatility is improved, but antenna design complexity increases
Solution Approach 1:
The patent applies universality by designing the antenna structure with reflectors that can serve multiple frequency bands (2.4 GHz and 5 GHz WLAN) through a single configuration. The adjustable reflector elements can be configured to support both frequency bands, allowing one antenna structure to perform multiple functions rather than requiring separate antennas for each band.
Solution Approach 2:
The dynamic adjustability of the reflector elements enables the antenna to adapt its characteristics for different frequency bands. By switching the reflector lengths appropriately, the same antenna structure can optimize its performance for either 2.4 GHz or 5 GHz operation, providing frequency versatility without increasing physical complexity.
3Reliability
If reflector length is increased to eliminate nulls, then radiation pattern performance improves, but device size increases
Solution Approach 1:
The patent resolves this contradiction by making the reflector length dynamic rather than fixed. The switching elements allow the reflector to be extended (enabled) when null elimination is needed to improve radiation pattern quality, and retracted (disabled) when compact size is required. This dynamic configuration allows the system to achieve good radiation patterns only when necessary, minimizing the average size.
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 solution dynamically adjusts the radiation pattern, significantly improving communication quality by eliminating nulls and supporting dual-band operations, such as WLAN 2.4 GHz/5 GHz, while minimizing size and manufacturing costs.
Implementation Method 1
a first reflector (120) and a second reflector (130)... The first reflector (120) is disposed adjacent to the antenna structure (200). The second reflector (130) is disposed adjacent to the antenna structure (200)
Data Source
AI summary
A communication device includes a ground element, an antenna structure, a first reflector, a second reflector, a first tuning element, and a switch element. The first reflector is disposed adjacent to the antenna structure. The second reflector is disposed adjacent to the antenna structure. The second reflector is separate from the first reflector. The switch element is coupled to the first tuning element. When the switch element is enabled, the switch element couples the first tuning element to the first reflector or the second reflector. When the switch element is disabled, the first tuning element is separate from the first reflector and the second reflector.