Multi-feed antenna impedance matching isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multi-band communication systems face challenges in impedance matching and isolation, particularly due to interference from human presence or metal objects, leading to efficiency and performance degradation.
Innovation Solution
The implementation of a multi-feed antenna coupled with a tunable matching network, which provides physical separation and dynamic impedance adjustment across multiple bands and modes, using a controller and look-up table to optimize impedance matching based on detected conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a single antenna is used for multi-band communication, then device size is reduced, but impedance matching and isolation performance deteriorate due to interference from human presence or metal objects
Solution Approach 1:
The single antenna is segmented into multiple independent feed ports (first feed port, second feed port, third feed port) that can be independently controlled. Each feed port has its own impedance matching circuit, allowing independent optimization of impedance matching for different frequency bands and modes, thereby resolving the impedance matching deterioration caused by human presence or metal objects while maintaining compact device size.
Solution Approach 2:
The impedance matching circuits are designed to be dynamically adjustable across multiple frequency bands (e.g., DCS, PCS, AWS/WCDMA1 bands) and modes (uplink transmit, downlink receive). The system can adaptively switch between different feed ports and matching configurations based on detected conditions, maintaining optimal impedance matching performance despite changes in environment or user interaction.
2Adaptability or versatility
If multiple paths are added to support multiple bands and modes, then communication versatility is improved, but path isolation deteriorates due to interference between paths
Solution Approach 1:
The communication system is segmented into multiple independent paths, each handling specific frequency bands and modes. The multi-feed antenna structure provides physical separation between paths through distinct feed ports, reducing mutual interference. Each path can be independently optimized and controlled, allowing versatile multi-band communication while maintaining adequate isolation between concurrent operations.
3Reliability
If impedance matching is optimized for one band, then performance in that band is improved, but performance in other bands deteriorates due to fixed matching configuration
Solution Approach 1:
The impedance matching circuits are designed with dynamic adjustment capability across multiple frequency bands. Each feed port has its own matching circuit that can be independently tuned for different bands (DCS, PCS, AWS/WCDMA1) and modes (uplink, downlink). The system can adaptively switch between different matching configurations based on the active frequency band, maintaining optimal performance across all supported bands rather than compromising any single band.
Data Source
AI summary
A communication system is provided, including an antenna coupled to multiple RF paths, one or more matching networks, multiple switches, a controller configured to control the one or more matching networks and the multiple switches, and a look-up table coupled to the controller, the look-up table including characterization data according to frequency bands and conditions. The multiple switches are controlled to engage the signal path corresponding to the frequency band selected. The one or more matching networks are controlled by the controller to provide optimum impedance for the frequency band selected and a condition detected during a time interval with reference to the look-up table. Additional switches may be included to improve isolation.