Smart Antenna Impedance Transformation for Multi-Beam Bandwidth
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Solution Overview
Problem
Smart antennas have a limited operating bandwidth due to significant changes in input impedance, leading to large reflection coefficients and restricted additional gain for various beam shapes.
Innovation Solution
Incorporating an impedance transformation circuit that adjusts the input impedance of the antenna element array to match the feeder's characteristic impedance, allowing for minimal reflection and maintaining a consistent input impedance across different beam shapes, thereby enhancing the operating bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the smart antenna forms multiple different beam shapes to increase additional gain, then the input impedance changes significantly, but this causes large reflection coefficients and limits the operating bandwidth
Solution Approach 1:
An impedance transformation circuit is introduced as an intermediary component between the antenna element array and the feeder. This circuit transforms the varying input impedance of the antenna element array into a stable preset impedance at the smart antenna input, minimizing reflection coefficients and expanding operating bandwidth while allowing the antenna to form multiple beam shapes with different gains
2Reliability
If the input impedance of the smart antenna is kept within a limited range to minimize reflection, then the additional gain for different beam shapes is restricted, but this limits the antenna's adaptability
Solution Approach 1:
The antenna system is segmented into two functional parts: the antenna element array that provides beam shaping capability with varying impedance, and the impedance transformation circuit that handles impedance matching. This segmentation allows each part to optimize its function independently - the antenna array can achieve large additional gain through multiple beam shapes while the transformation circuit ensures minimal reflection by maintaining stable input impedance
Data Source
AI summary
A smart antenna, an antenna feeder system, an antenna communications system, and an Access Point (AP) are provided. The smart antenna includes an antenna element array and an impedance transformation circuit. A feeding end of the antenna element array is connected to a first end of the impedance transformation circuit, a second end of the impedance transformation circuit is an input end of the smart antenna, and the input end of the smart antenna is connected to a feeder. The antenna element array can form a plurality of different beam shapes, and the impedance transformation circuit is configured to transform the different input impedance of the feeding end of the antenna element array into preset input impedance at the input end of the smart antenna.