Synthesized-Beam RFID Antenna Gain Compensation
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Solution Overview
Problem
RFID systems face beam gain degradation due to undesired coupling with radiation pattern side lobes and floating antenna elements, leading to reduced tag read/write capabilities.
Innovation Solution
A synthesized-beam antenna transceiver system that compensates for beam gain degradation by varying conducted power based on stored or sensed transmit power data and terminating unused antenna elements to a reference potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antenna elements are used to generate radiation patterns in different directions, then beam steering capability is improved, but beam gain degradation occurs due to coupling with side lobes and floating antenna elements
Solution Approach 1:
The patent extracts and removes the harmful coupling effects between antenna elements by selectively activating only the necessary elements for each beam direction and terminating unused elements to a reference potential. This eliminates the side lobe interference and floating element coupling that cause beam gain degradation, while maintaining the ability to steer beams in different directions.
Solution Approach 2:
The patent changes the operational state of antenna elements by varying the conducted power levels and terminating unused elements to a reference potential. This parameter adjustment compensates for beam gain variations across different orientations, ensuring consistent performance while maintaining beam steering capability.
2Area of stationary object
If radiation patterns are oriented in different directions, then coverage area is improved, but power consistency deteriorates as different orientations have different power levels
Solution Approach 1:
The patent adjusts the conducted power parameter for each antenna element based on its orientation and activation state. By varying power levels and terminating unused elements to a reference potential, the system compensates for directional gain variations, maintaining consistent radiated power across all beam orientations while preserving wide coverage capability.
3Device complexity
If unused antenna elements are left floating, then device complexity is reduced, but beam gain degradation increases due to undesired coupling
Solution Approach 1:
The patent removes the harmful effect of floating antenna elements by terminating them to a reference potential. This simple termination approach eliminates undesired coupling while adding minimal complexity to the antenna system, thereby maintaining beam gain stability without significantly increasing device complexity.
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
The system maintains consistent peak radiated power across different beam orientations, enhancing tag read/write capabilities and reducing power gaps, thereby improving the overall performance of RFID systems.
Implementation Method 1
Synthesized-beam antennas (SBAs) use multiple antenna elements to generate radio frequency (RF) radiation patterns with varying shapes and orientations
Implementation Method 2
compensates for beam gain degradation by varying conducted power based on stored or sensed transmit power data
Implementation Method 3
undesired coupling with radiation pattern side lobes and floating antenna elements
Data Source
AI summary
A synthesized-beam transceiver system steers a beam of a two-dimensional antenna array by activating a first subset of antenna elements to orient the beam in a first direction and subsequently activating a second subset of the antenna elements to orient the beam in a different direction. The system also electrically connects antenna elements that are inactive, not in the first subset, or not in the second subset to a reference potential of the array.