Pattern Diversity Antenna Switching Modes
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Solution Overview
Problem
In electronic devices, achieving low envelope correlation coefficient (ECC) for antenna diversity is challenging, especially with co-located or closely coupled antennas, as it requires more space for additional antennas, which is not feasible in constrained radiation spaces like mobile devices.
Innovation Solution
The implementation of pattern diversity assisted antennas, which utilize a single antenna element with switchable modes to redirect current flow and achieve different radiation patterns, thereby achieving low ECC without the need for additional space, using RF switches and parasitic ground elements to create de-correlated modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional antennas are added to achieve antenna diversity and low ECC, then antenna diversity performance is improved, but device space requirements increase
Solution Approach 1:
The patent segments a single antenna element into multiple operational modes by using RF switches to redirect current flow through different paths (e.g., monopole mode, loop mode, parasitic mode). This segmentation allows one physical antenna to provide diversity functions that traditionally required multiple separate antennas, thereby improving antenna diversity performance without increasing device space requirements.
Solution Approach 2:
The patent implements dynamic switching between different antenna radiation patterns using RF switches. The antenna system can dynamically change its current flow configuration to generate different radiation patterns (first pattern, second pattern, third pattern) based on channel conditions, enabling adaptive antenna diversity without requiring multiple fixed physical antennas.
2Area of stationary object
If co-located antennas are used to reduce space, then device space is reduced, but achieving low envelope correlation coefficient becomes difficult
Solution Approach 1:
The patent changes the operational parameters of the antenna by switching between different current flow configurations and resonance modes. By adjusting which antenna elements are active and how current flows through the structure (monopole, loop, parasitic modes), the system achieves different radiation patterns and maintains low envelope correlation coefficient despite the antennas being co-located in a constrained 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
This approach allows for effective antenna diversity in both SISO and MIMO configurations, improving wireless connectivity by reducing channel fading and null spots, while maintaining the same antenna geometry and impedance matching across different modes.
Implementation Method 1
causes the first antenna element to radiate electromagnetic energy in a first radiation pattern in the first mode and causes the second antenna element to radiate electromagnetic energy in a second radiation pattern in the second mode
Implementation Method 2
utilize a single antenna element with switchable modes to redirect current flow and achieve different radiation patterns
Implementation Method 3
using RF switches and parasitic ground elements to create de-correlated modes
Data Source
AI summary
Antenna structures and methods of operating the same of an electronic device are described. One apparatus includes a radio coupled to a RF feed and an RF switch, a first antenna element coupled to the RF feed, and a second antenna element coupled to the RF switch, the RF switch being coupled to a grounding point of a ground plane. The radio controls the RF switch between a first mode and a second mode. The radio causes the first antenna element to radiate electromagnetic energy in a first radiation pattern in the first mode and causes the second antenna element to radiate electromagnetic energy in a second radiation pattern in the second mode. The second radiation pattern is different than the first radiation pattern.