Multi-band Antenna with Tunable Matching Networks for Isolation
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Solution Overview
Problem
Current communication systems face challenges in achieving optimal impedance matching and isolation across multiple frequency bands and modes, especially when interference from objects like human hands or metal objects occurs, leading to efficiency and performance degradation.
Innovation Solution
The implementation of a multi-feed antenna coupled with tunable matching networks and switches, which dynamically adjust impedance and provide physical separation of signal paths to optimize performance across various frequency bands and conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a single antenna is used for multiple frequency bands and modes, then device size is reduced, but impedance matching and isolation performance deteriorate due to interference from objects like human hands or metal objects
Solution Approach 1:
The patent divides the single antenna system into multiple independent feed paths (first feed path, second feed path, third feed path), each capable of handling different frequency bands or modes separately. This segmentation allows independent impedance matching for each path, resolving the contradiction by maintaining compact size while improving reliability through isolated signal processing channels that prevent mutual interference.
Solution Approach 2:
The patent employs tunable matching networks with dynamically adjustable impedance elements (such as variable capacitors or inductors) in each feed path. These dynamic components can be tuned in real-time to optimize impedance matching for different frequency bands and operating conditions, allowing the system to adapt to interference from objects like human hands while maintaining compact dimensions.
2Reliability
If multiple separate antennas are used for different frequency bands, then impedance matching and isolation are improved, but device size and complexity increase
Solution Approach 1:
The patent merges multiple feed paths into a single integrated antenna structure with a common ground plane and shared housing. By combining multiple independent signal processing paths within one physical antenna assembly, the system achieves the isolation benefits of separate antennas while avoiding the complexity and size increase that would result from using multiple discrete antenna components.
Solution Approach 2:
The patent designs a universal antenna structure that can handle multiple frequency bands and communication modes (WiFi, WiMax, cellular) through its multiple feed paths. Each feed path is configured to support specific frequency ranges, allowing the single antenna system to perform the functions of multiple specialized antennas while maintaining a unified, manageable design rather than increasing overall system complexity.
3Reliability
If impedance matching is optimized for one frequency band, then performance in that band is improved, but performance in other bands deteriorates due to fixed impedance configuration
Solution Approach 1:
The patent implements tunable matching networks in each feed path with adjustable impedance elements that can be dynamically reconfigured for different frequency bands. This dynamic adjustment capability allows the system to optimize impedance matching for the currently active frequency band while maintaining proper matching for other bands through the independent tuning of each path, thereby achieving both high signal transmission efficiency and multi-band adaptability.
Solution Approach 2:
The patent changes the impedance parameters of the matching networks based on the operating frequency band. By adjusting the electrical characteristics (capacitance, inductance values) of the matching components in each feed path according to the active frequency band, the system achieves optimal impedance matching across multiple bands rather than being constrained by a fixed impedance configuration designed for a single band.
Data Source
AI summary
A communication system is provided, including one or more antennas coupled to multiple RF paths, one or more matching blocks, each block including multiple matching networks, a look-up table including characterization data according to frequency bands and conditions, and a controller configured to control the multiple matching networks by referring to the look-up table to provide optimum impedance for a frequency band selected and a condition detected during a time interval. The matching block may further include switches and adjustment circuits.