Reconfigurable Active Antenna Circuits for Multi-Band MIMO Isolation
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Solution Overview
Problem
Current antenna systems struggle to provide efficient multi-band operation, maintain isolation and de-correlated radiation patterns in MIMO applications, and adapt to varying use conditions such as hand or head loading, which affects communication system performance.
Innovation Solution
A reconfigurable active antenna system that combines active and passive components to dynamically impedance match, alter frequency response, and change radiation patterns, utilizing modal antennas with tunable components like switches, capacitors, and parasitic elements, and incorporating a processor and algorithm for optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a single antenna is used for multi-band operation, then device size is reduced, but antenna efficiency and performance deteriorate
Solution Approach 1:
The patent implements dynamic reconfiguration of the antenna system using switches and tuning elements that can change the antenna's electrical characteristics in real-time. This allows a single physical antenna structure to dynamically adapt its impedance, resonant frequency, and radiation pattern to maintain high efficiency across multiple frequency bands and operating conditions.
Solution Approach 2:
The system changes key electrical parameters including impedance values, resonant frequencies, and radiation patterns through active tuning elements. By dynamically adjusting these parameters based on the operating band and environmental conditions, the antenna maintains optimal performance across wide frequency ranges without requiring multiple fixed-configuration antennas.
2Reliability
If multiple antennas are used for MIMO applications, then isolation and de-correlated radiation patterns are improved, but device complexity increases
Solution Approach 1:
Each antenna element in the system is designed to perform multiple functions: it can operate in different frequency bands, generate multiple radiation patterns, and provide both transmit and receive diversity. This multi-functionality allows the system to achieve MIMO performance with fewer physical elements, reducing overall system complexity while maintaining isolation and de-correlation.
Solution Approach 2:
The antenna system uses dynamic reconfiguration to alter radiation patterns and impedance characteristics in real-time. By dynamically changing the electrical properties of antenna elements through switches and tuning circuits, the system can maintain proper isolation and de-correlation across multiple frequency bands without requiring additional fixed-configuration antennas.
3Device complexity
If passive impedance matching is used, then device complexity is reduced, but adaptability to varying use conditions deteriorates
Solution Approach 1:
The system replaces static passive impedance matching circuits with dynamic active tuning circuits that can adapt to varying operating conditions. Switches and variable impedance elements allow the antenna system to actively adjust its impedance characteristics in real-time, providing adaptability to different frequency bands, power amplifier outputs, and environmental conditions such as hand or head loading.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor operating conditions and adjust impedance matching parameters accordingly. This allows the antenna system to automatically adapt to varying use conditions including different frequency bands, power levels, and environmental factors, maintaining optimal performance without requiring complex manual configuration.
4Length of stationary object
If active tuning elements are added to achieve multi-band operation, then frequency bandwidth is extended, but device complexity increases
Solution Approach 1:
The patent combines multiple functions including impedance matching, band switching, and radiation pattern control into a single integrated reconfiguration system. By merging these functions and sharing common tuning elements and control circuits across multiple antenna elements, the system achieves wide multi-band operation while minimizing the increase in overall device complexity.
Data Source
AI summary
A reconfigurable antenna system is described which combines active and passive components used to impedance match, alter the frequency response, and change the radiation pattern of an antenna. Re-use of components such as switches and tunable capacitors make the circuit topologies more space and cost effective, while reducing complexity of the control signaling required. Antenna structures with single and multiple feed and/or ground connections are described and active circuit topologies are shown for these configurations. A processor and algorithm can reside with the antenna circuitry, or the algorithm to control antenna optimization can be implemented in a processor in the host device.